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cairo/src/cairo-pdf-surface.c
Chris Wilson 1bccbd88c3 [cairo-pdf-surface] Review error propagation from output stream. 
Ensure that errors encountered whilst processing the output stream are
propagated back to the surface (and the user).
2008-01-16 17:02:52 +00:00

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/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc
* Copyright © 2006 Red Hat, Inc
* Copyright © 2007, 2008 Adrian Johnson
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Kristian Høgsberg <krh@redhat.com>
* Carl Worth <cworth@cworth.org>
* Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairoint.h"
#include "cairo-pdf.h"
#include "cairo-pdf-surface-private.h"
#include "cairo-pdf-operators-private.h"
#include "cairo-scaled-font-subsets-private.h"
#include "cairo-paginated-private.h"
#include "cairo-output-stream-private.h"
#include "cairo-meta-surface-private.h"
#include <time.h>
#include <zlib.h>
/* Issues:
*
* - We embed an image in the stream each time it's composited. We
* could add generation counters to surfaces and remember the stream
* ID for a particular generation for a particular surface.
*
* - Images of other formats than 8 bit RGBA.
*
* - Backend specific meta data.
*
* - Surface patterns.
*
* - Should/does cairo support drawing into a scratch surface and then
* using that as a fill pattern? For this backend, that would involve
* using a tiling pattern (4.6.2). How do you create such a scratch
* surface? cairo_surface_create_similar() ?
*
* - What if you create a similar surface and does show_page and then
* does show_surface on another surface?
*
* - Add test case for RGBA images.
*
* - Add test case for RGBA gradients.
*
* - Coordinate space for create_similar() args?
*/
/*
* Page Structure of the Generated PDF:
*
* Each page requiring fallbacks images contains a knockout group at
* the top level. The first operation of the knockout group paints a
* group containing all the supported drawing operations. Fallback
* images (if any) are painted in the knockout group. This ensures
* that fallback images do not composite with any content under the
* fallback images.
*
* Streams:
*
* This PDF surface has three types of streams:
* - PDF Stream
* - Content Stream
* - Group Stream
*
* Calling _cairo_output_stream_printf (surface->output, ...) will
* write to the currently open stream.
*
* PDF Stream:
* A PDF Stream may be opened and closed with the following functions:
* _cairo_pdf_surface_open stream ()
* _cairo_pdf_surface_close_stream ()
*
* PDF Streams are written directly to the PDF file. They are used for
* fonts, images and patterns.
*
* Content Stream:
* The Content Stream is opened and closed with the following functions:
* _cairo_pdf_surface_open_content_stream ()
* _cairo_pdf_surface_close_content_stream ()
*
* The Content Stream contains the text and graphics operators.
*
* Group Stream:
* A Group Stream may be opened and closed with the following functions:
* _cairo_pdf_surface_open_group ()
* _cairo_pdf_surface_close_group ()
*
* A Group Stream is a Form XObject. It is used for short sequences
* of operators. As the content is very short the group is stored in
* memory until it is closed. This allows some optimization such as
* including the Resource dictionary and stream length inside the
* XObject instead of using an indirect object.
*/
typedef struct _cairo_pdf_object {
long offset;
} cairo_pdf_object_t;
typedef struct _cairo_pdf_font {
unsigned int font_id;
unsigned int subset_id;
cairo_pdf_resource_t subset_resource;
} cairo_pdf_font_t;
typedef struct _cairo_pdf_rgb_linear_function {
cairo_pdf_resource_t resource;
double color1[3];
double color2[3];
} cairo_pdf_rgb_linear_function_t;
typedef struct _cairo_pdf_alpha_linear_function {
cairo_pdf_resource_t resource;
double alpha1;
double alpha2;
} cairo_pdf_alpha_linear_function_t;
static cairo_pdf_resource_t
_cairo_pdf_surface_new_object (cairo_pdf_surface_t *surface);
static void
_cairo_pdf_surface_clear (cairo_pdf_surface_t *surface);
static void
_cairo_pdf_smask_group_destroy (cairo_pdf_smask_group_t *group);
static cairo_status_t
_cairo_pdf_surface_add_font (unsigned int font_id,
unsigned int subset_id,
void *closure);
static void
_cairo_pdf_group_resources_init (cairo_pdf_group_resources_t *res);
static cairo_status_t
_cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t *resource,
cairo_bool_t compressed,
const char *fmt,
...) CAIRO_PRINTF_FORMAT(4, 5);
static cairo_status_t
_cairo_pdf_surface_close_stream (cairo_pdf_surface_t *surface);
static cairo_status_t
_cairo_pdf_surface_write_page (cairo_pdf_surface_t *surface);
static void
_cairo_pdf_surface_write_pages (cairo_pdf_surface_t *surface);
static cairo_pdf_resource_t
_cairo_pdf_surface_write_info (cairo_pdf_surface_t *surface);
static cairo_pdf_resource_t
_cairo_pdf_surface_write_catalog (cairo_pdf_surface_t *surface);
static long
_cairo_pdf_surface_write_xref (cairo_pdf_surface_t *surface);
static cairo_status_t
_cairo_pdf_surface_write_page (cairo_pdf_surface_t *surface);
static cairo_status_t
_cairo_pdf_surface_emit_font_subsets (cairo_pdf_surface_t *surface);
static const cairo_surface_backend_t cairo_pdf_surface_backend;
static const cairo_paginated_surface_backend_t cairo_pdf_surface_paginated_backend;
static cairo_pdf_resource_t
_cairo_pdf_surface_new_object (cairo_pdf_surface_t *surface)
{
cairo_pdf_resource_t resource;
cairo_status_t status;
cairo_pdf_object_t object;
object.offset = _cairo_output_stream_get_position (surface->output);
status = _cairo_array_append (&surface->objects, &object);
if (status) {
resource.id = 0;
return resource;
}
resource = surface->next_available_resource;
surface->next_available_resource.id++;
return resource;
}
static void
_cairo_pdf_surface_update_object (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t resource)
{
cairo_pdf_object_t *object;
object = _cairo_array_index (&surface->objects, resource.id - 1);
object->offset = _cairo_output_stream_get_position (surface->output);
}
static cairo_surface_t *
_cairo_pdf_surface_create_for_stream_internal (cairo_output_stream_t *output,
double width,
double height)
{
cairo_pdf_surface_t *surface;
cairo_status_t status, status_ignored;
surface = malloc (sizeof (cairo_pdf_surface_t));
if (surface == NULL) {
/* destroy stream on behalf of caller */
status = _cairo_output_stream_destroy (output);
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
}
_cairo_surface_init (&surface->base, &cairo_pdf_surface_backend,
CAIRO_CONTENT_COLOR_ALPHA);
surface->output = output;
surface->width = width;
surface->height = height;
cairo_matrix_init (&surface->cairo_to_pdf, 1, 0, 0, -1, 0, height);
_cairo_array_init (&surface->objects, sizeof (cairo_pdf_object_t));
_cairo_array_init (&surface->pages, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&surface->rgb_linear_functions, sizeof (cairo_pdf_rgb_linear_function_t));
_cairo_array_init (&surface->alpha_linear_functions, sizeof (cairo_pdf_alpha_linear_function_t));
_cairo_array_init (&surface->fonts, sizeof (cairo_pdf_font_t));
_cairo_array_init (&surface->patterns, sizeof (cairo_pdf_pattern_t));
_cairo_array_init (&surface->smask_groups, sizeof (cairo_pdf_smask_group_t *));
_cairo_array_init (&surface->knockout_group, sizeof (cairo_pdf_resource_t));
_cairo_pdf_group_resources_init (&surface->resources);
surface->font_subsets = _cairo_scaled_font_subsets_create_composite ();
if (! surface->font_subsets) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto BAIL0;
}
surface->next_available_resource.id = 1;
surface->pages_resource = _cairo_pdf_surface_new_object (surface);
if (surface->pages_resource.id == 0) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto BAIL1;
}
surface->compress_content = TRUE;
surface->pdf_stream.active = FALSE;
surface->pdf_stream.old_output = NULL;
surface->group_stream.active = FALSE;
surface->group_stream.stream = NULL;
surface->group_stream.mem_stream = NULL;
surface->paginated_mode = CAIRO_PAGINATED_MODE_ANALYZE;
surface->force_fallbacks = FALSE;
_cairo_pdf_operators_init (&surface->pdf_operators,
surface->output,
surface->cairo_to_pdf,
surface->font_subsets);
_cairo_pdf_operators_set_font_subsets_callback (&surface->pdf_operators,
_cairo_pdf_surface_add_font,
surface);
/* Document header */
_cairo_output_stream_printf (surface->output,
"%%PDF-1.4\r\n");
_cairo_output_stream_printf (surface->output,
"%%%c%c%c%c\r\n", 181, 237, 174, 251);
surface->paginated_surface = _cairo_paginated_surface_create (
&surface->base,
CAIRO_CONTENT_COLOR_ALPHA,
width, height,
&cairo_pdf_surface_paginated_backend);
status = surface->paginated_surface->status;
if (status == CAIRO_STATUS_SUCCESS)
return surface->paginated_surface;
BAIL1:
_cairo_scaled_font_subsets_destroy (surface->font_subsets);
BAIL0:
_cairo_array_fini (&surface->objects);
free (surface);
/* destroy stream on behalf of caller */
status_ignored = _cairo_output_stream_destroy (output);
return _cairo_surface_create_in_error (status);
}
/**
* cairo_pdf_surface_create_for_stream:
* @write_func: a #cairo_write_func_t to accept the output data
* @closure: the closure argument for @write_func
* @width_in_points: width of the surface, in points (1 point == 1/72.0 inch)
* @height_in_points: height of the surface, in points (1 point == 1/72.0 inch)
*
* Creates a PDF surface of the specified size in points to be written
* incrementally to the stream represented by @write_func and @closure.
*
* Return value: a pointer to the newly created surface. The caller
* owns the surface and should call cairo_surface_destroy when done
* with it.
*
* This function always returns a valid pointer, but it will return a
* pointer to a "nil" surface if an error such as out of memory
* occurs. You can use cairo_surface_status() to check for this.
*
* Since: 1.2
*/
cairo_surface_t *
cairo_pdf_surface_create_for_stream (cairo_write_func_t write_func,
void *closure,
double width_in_points,
double height_in_points)
{
cairo_output_stream_t *output;
output = _cairo_output_stream_create (write_func, NULL, closure);
if (_cairo_output_stream_get_status (output))
return _cairo_surface_create_in_error (_cairo_output_stream_destroy (output));
return _cairo_pdf_surface_create_for_stream_internal (output,
width_in_points,
height_in_points);
}
/**
* cairo_pdf_surface_create:
* @filename: a filename for the PDF output (must be writable)
* @width_in_points: width of the surface, in points (1 point == 1/72.0 inch)
* @height_in_points: height of the surface, in points (1 point == 1/72.0 inch)
*
* Creates a PDF surface of the specified size in points to be written
* to @filename.
*
* Return value: a pointer to the newly created surface. The caller
* owns the surface and should call cairo_surface_destroy when done
* with it.
*
* This function always returns a valid pointer, but it will return a
* pointer to a "nil" surface if an error such as out of memory
* occurs. You can use cairo_surface_status() to check for this.
*
* Since: 1.2
**/
cairo_surface_t *
cairo_pdf_surface_create (const char *filename,
double width_in_points,
double height_in_points)
{
cairo_output_stream_t *output;
output = _cairo_output_stream_create_for_filename (filename);
if (_cairo_output_stream_get_status (output))
return _cairo_surface_create_in_error (_cairo_output_stream_destroy (output));
return _cairo_pdf_surface_create_for_stream_internal (output,
width_in_points,
height_in_points);
}
static cairo_bool_t
_cairo_surface_is_pdf (cairo_surface_t *surface)
{
return surface->backend == &cairo_pdf_surface_backend;
}
/* If the abstract_surface is a paginated surface, and that paginated
* surface's target is a pdf_surface, then set pdf_surface to that
* target. Otherwise return CAIRO_STATUS_SURFACE_TYPE_MISMATCH.
*/
static cairo_status_t
_extract_pdf_surface (cairo_surface_t *surface,
cairo_pdf_surface_t **pdf_surface)
{
cairo_surface_t *target;
if (! _cairo_surface_is_paginated (surface))
return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
target = _cairo_paginated_surface_get_target (surface);
if (! _cairo_surface_is_pdf (target))
return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
*pdf_surface = (cairo_pdf_surface_t *) target;
return CAIRO_STATUS_SUCCESS;
}
/**
* cairo_pdf_surface_set_size:
* @surface: a PDF cairo_surface_t
* @width_in_points: new surface width, in points (1 point == 1/72.0 inch)
* @height_in_points: new surface height, in points (1 point == 1/72.0 inch)
*
* Changes the size of a PDF surface for the current (and
* subsequent) pages.
*
* This function should only be called before any drawing operations
* have been performed on the current page. The simplest way to do
* this is to call this function immediately after creating the
* surface or immediately after completing a page with either
* cairo_show_page() or cairo_copy_page().
*
* Since: 1.2
**/
void
cairo_pdf_surface_set_size (cairo_surface_t *surface,
double width_in_points,
double height_in_points)
{
cairo_pdf_surface_t *pdf_surface = NULL; /* hide compiler warning */
cairo_status_t status;
status = _extract_pdf_surface (surface, &pdf_surface);
if (status) {
status = _cairo_surface_set_error (surface, status);
return;
}
pdf_surface->width = width_in_points;
pdf_surface->height = height_in_points;
cairo_matrix_init (&pdf_surface->cairo_to_pdf, 1, 0, 0, -1, 0, height_in_points);
_cairo_pdf_operators_set_cairo_to_pdf_matrix (&pdf_surface->pdf_operators,
pdf_surface->cairo_to_pdf);
status = _cairo_paginated_surface_set_size (pdf_surface->paginated_surface,
width_in_points,
height_in_points);
if (status)
status = _cairo_surface_set_error (surface, status);
}
static void
_cairo_pdf_surface_clear (cairo_pdf_surface_t *surface)
{
int i, size;
cairo_pdf_pattern_t *pattern;
cairo_pdf_smask_group_t *group;
size = _cairo_array_num_elements (&surface->patterns);
for (i = 0; i < size; i++) {
pattern = (cairo_pdf_pattern_t *) _cairo_array_index (&surface->patterns, i);
cairo_pattern_destroy (pattern->pattern);
}
_cairo_array_truncate (&surface->patterns, 0);
size = _cairo_array_num_elements (&surface->smask_groups);
for (i = 0; i < size; i++) {
_cairo_array_copy_element (&surface->smask_groups, i, &group);
_cairo_pdf_smask_group_destroy (group);
}
_cairo_array_truncate (&surface->smask_groups, 0);
_cairo_array_truncate (&surface->knockout_group, 0);
}
static void
_cairo_pdf_group_resources_init (cairo_pdf_group_resources_t *res)
{
_cairo_array_init (&res->alphas, sizeof (double));
_cairo_array_init (&res->smasks, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&res->patterns, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&res->xobjects, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&res->fonts, sizeof (cairo_pdf_font_t));
}
static void
_cairo_pdf_group_resources_fini (cairo_pdf_group_resources_t *res)
{
_cairo_array_fini (&res->alphas);
_cairo_array_fini (&res->smasks);
_cairo_array_fini (&res->patterns);
_cairo_array_fini (&res->xobjects);
_cairo_array_fini (&res->fonts);
}
static void
_cairo_pdf_group_resources_clear (cairo_pdf_group_resources_t *res)
{
_cairo_array_truncate (&res->alphas, 0);
_cairo_array_truncate (&res->smasks, 0);
_cairo_array_truncate (&res->patterns, 0);
_cairo_array_truncate (&res->xobjects, 0);
_cairo_array_truncate (&res->fonts, 0);
}
static cairo_status_t
_cairo_pdf_surface_add_alpha (cairo_pdf_surface_t *surface,
double alpha,
int *index)
{
int num_alphas, i;
double other;
cairo_status_t status;
cairo_pdf_group_resources_t *res = &surface->resources;
num_alphas = _cairo_array_num_elements (&res->alphas);
for (i = 0; i < num_alphas; i++) {
_cairo_array_copy_element (&res->alphas, i, &other);
if (alpha == other) {
*index = i;
return CAIRO_STATUS_SUCCESS;
}
}
status = _cairo_array_append (&res->alphas, &alpha);
if (status)
return status;
*index = _cairo_array_num_elements (&res->alphas) - 1;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_add_smask (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t smask)
{
return _cairo_array_append (&(surface->resources.smasks), &smask);
}
static cairo_status_t
_cairo_pdf_surface_add_pattern (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t pattern)
{
return _cairo_array_append (&(surface->resources.patterns), &pattern);
}
static cairo_status_t
_cairo_pdf_surface_add_xobject (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t xobject)
{
return _cairo_array_append (&(surface->resources.xobjects), &xobject);
}
static cairo_status_t
_cairo_pdf_surface_add_font (unsigned int font_id,
unsigned int subset_id,
void *closure)
{
cairo_pdf_surface_t *surface = closure;
cairo_pdf_font_t font;
int num_fonts, i;
cairo_status_t status;
cairo_pdf_group_resources_t *res = &surface->resources;
num_fonts = _cairo_array_num_elements (&res->fonts);
for (i = 0; i < num_fonts; i++) {
_cairo_array_copy_element (&res->fonts, i, &font);
if (font.font_id == font_id &&
font.subset_id == subset_id)
return CAIRO_STATUS_SUCCESS;
}
num_fonts = _cairo_array_num_elements (&surface->fonts);
for (i = 0; i < num_fonts; i++) {
_cairo_array_copy_element (&surface->fonts, i, &font);
if (font.font_id == font_id &&
font.subset_id == subset_id)
return _cairo_array_append (&res->fonts, &font);
}
font.font_id = font_id;
font.subset_id = subset_id;
font.subset_resource = _cairo_pdf_surface_new_object (surface);
if (font.subset_resource.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
status = _cairo_array_append (&surface->fonts, &font);
if (status)
return status;
return _cairo_array_append (&res->fonts, &font);
}
static cairo_pdf_resource_t
_cairo_pdf_surface_get_font_resource (cairo_pdf_surface_t *surface,
unsigned int font_id,
unsigned int subset_id)
{
cairo_pdf_font_t font;
int num_fonts, i;
num_fonts = _cairo_array_num_elements (&surface->fonts);
for (i = 0; i < num_fonts; i++) {
_cairo_array_copy_element (&surface->fonts, i, &font);
if (font.font_id == font_id && font.subset_id == subset_id)
return font.subset_resource;
}
font.subset_resource.id = 0;
return font.subset_resource;
}
static void
_cairo_pdf_surface_emit_group_resources (cairo_pdf_surface_t *surface,
cairo_pdf_group_resources_t *res)
{
int num_alphas, num_smasks, num_resources, i;
double alpha;
cairo_pdf_resource_t *smask, *pattern, *xobject;
cairo_pdf_font_t *font;
_cairo_output_stream_printf (surface->output, "<<\r\n");
num_alphas = _cairo_array_num_elements (&res->alphas);
num_smasks = _cairo_array_num_elements (&res->smasks);
if (num_alphas > 0 || num_smasks > 0) {
_cairo_output_stream_printf (surface->output,
" /ExtGState <<\r\n");
for (i = 0; i < num_alphas; i++) {
_cairo_array_copy_element (&res->alphas, i, &alpha);
_cairo_output_stream_printf (surface->output,
" /a%d << /CA %f /ca %f >>\r\n",
i, alpha, alpha);
}
for (i = 0; i < num_smasks; i++) {
smask = _cairo_array_index (&res->smasks, i);
_cairo_output_stream_printf (surface->output,
" /s%d %d 0 R\r\n",
smask->id, smask->id);
}
_cairo_output_stream_printf (surface->output,
" >>\r\n");
}
num_resources = _cairo_array_num_elements (&res->patterns);
if (num_resources > 0) {
_cairo_output_stream_printf (surface->output,
" /Pattern <<");
for (i = 0; i < num_resources; i++) {
pattern = _cairo_array_index (&res->patterns, i);
_cairo_output_stream_printf (surface->output,
" /p%d %d 0 R",
pattern->id, pattern->id);
}
_cairo_output_stream_printf (surface->output,
" >>\r\n");
}
num_resources = _cairo_array_num_elements (&res->xobjects);
if (num_resources > 0) {
_cairo_output_stream_printf (surface->output,
" /XObject <<");
for (i = 0; i < num_resources; i++) {
xobject = _cairo_array_index (&res->xobjects, i);
_cairo_output_stream_printf (surface->output,
" /x%d %d 0 R",
xobject->id, xobject->id);
}
_cairo_output_stream_printf (surface->output,
" >>\r\n");
}
num_resources = _cairo_array_num_elements (&res->fonts);
if (num_resources > 0) {
_cairo_output_stream_printf (surface->output," /Font <<\r\n");
for (i = 0; i < num_resources; i++) {
font = _cairo_array_index (&res->fonts, i);
_cairo_output_stream_printf (surface->output,
" /f-%d-%d %d 0 R\r\n",
font->font_id,
font->subset_id,
font->subset_resource.id);
}
_cairo_output_stream_printf (surface->output, " >>\r\n");
}
_cairo_output_stream_printf (surface->output,
">>\r\n");
}
static cairo_pdf_smask_group_t *
_cairo_pdf_surface_create_smask_group (cairo_pdf_surface_t *surface)
{
cairo_pdf_smask_group_t *group;
group = calloc (1, sizeof (cairo_pdf_smask_group_t));
if (group == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
group->group_res = _cairo_pdf_surface_new_object (surface);
if (group->group_res.id == 0) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
free (group);
return NULL;
}
return group;
}
static void
_cairo_pdf_smask_group_destroy (cairo_pdf_smask_group_t *group)
{
if (group->operation == PDF_FILL || group->operation == PDF_STROKE)
_cairo_path_fixed_fini (&group->path);
if (group->source)
cairo_pattern_destroy (group->source);
if (group->mask)
cairo_pattern_destroy (group->mask);
if (group->scaled_font)
cairo_scaled_font_destroy (group->scaled_font);
free (group);
}
static cairo_status_t
_cairo_pdf_surface_add_smask_group (cairo_pdf_surface_t *surface,
cairo_pdf_smask_group_t *group)
{
return _cairo_array_append (&surface->smask_groups, &group);
}
static cairo_status_t
_cairo_pdf_surface_add_pdf_pattern (cairo_pdf_surface_t *surface,
cairo_pattern_t *pattern,
cairo_pdf_resource_t *pattern_res,
cairo_pdf_resource_t *gstate_res)
{
cairo_pdf_pattern_t pdf_pattern;
cairo_status_t status;
/* Solid colors are emitted into the content stream */
if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) {
pattern_res->id = 0;
gstate_res->id = 0;
return CAIRO_STATUS_SUCCESS;
}
/* Gradients with zero stops do not produce any output */
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
pattern->type == CAIRO_PATTERN_TYPE_RADIAL)
{
cairo_gradient_pattern_t *gradient;
gradient = (cairo_gradient_pattern_t *) pattern;
if (gradient->n_stops == 0)
return CAIRO_INT_STATUS_NOTHING_TO_DO;
}
pdf_pattern.pattern = cairo_pattern_reference (pattern);
pdf_pattern.pattern_res = _cairo_pdf_surface_new_object (surface);
if (pdf_pattern.pattern_res.id == 0) {
cairo_pattern_destroy (pattern);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
pdf_pattern.gstate_res.id = 0;
/* gradient patterns require an smask object to implement transparency */
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
pattern->type == CAIRO_PATTERN_TYPE_RADIAL) {
if (_cairo_pattern_is_opaque (pattern) == FALSE) {
pdf_pattern.gstate_res = _cairo_pdf_surface_new_object (surface);
if (pdf_pattern.gstate_res.id == 0) {
cairo_pattern_destroy (pattern);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
}
}
*pattern_res = pdf_pattern.pattern_res;
*gstate_res = pdf_pattern.gstate_res;
status = _cairo_array_append (&surface->patterns, &pdf_pattern);
if (status) {
cairo_pattern_destroy (pattern);
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t *resource,
cairo_bool_t compressed,
const char *fmt,
...)
{
va_list ap;
cairo_pdf_resource_t self, length;
cairo_output_stream_t *output = NULL;
if (resource) {
self = *resource;
_cairo_pdf_surface_update_object (surface, self);
} else {
self = _cairo_pdf_surface_new_object (surface);
if (self.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
length = _cairo_pdf_surface_new_object (surface);
if (length.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (compressed) {
output = _cairo_deflate_stream_create (surface->output);
if (_cairo_output_stream_get_status (output))
return _cairo_output_stream_destroy (output);
}
surface->pdf_stream.active = TRUE;
surface->pdf_stream.self = self;
surface->pdf_stream.length = length;
surface->pdf_stream.compressed = compressed;
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Length %d 0 R\r\n",
surface->pdf_stream.self.id,
surface->pdf_stream.length.id);
if (compressed)
_cairo_output_stream_printf (surface->output,
" /Filter /FlateDecode\r\n");
if (fmt != NULL) {
va_start (ap, fmt);
_cairo_output_stream_vprintf (surface->output, fmt, ap);
va_end (ap);
}
_cairo_output_stream_printf (surface->output,
">>\r\n"
"stream\r\n");
surface->pdf_stream.start_offset = _cairo_output_stream_get_position (surface->output);
if (compressed) {
assert (surface->pdf_stream.old_output == NULL);
surface->pdf_stream.old_output = surface->output;
surface->output = output;
_cairo_pdf_operators_set_stream (&surface->pdf_operators, surface->output);
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_close_stream (cairo_pdf_surface_t *surface)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
long length;
if (! surface->pdf_stream.active)
return CAIRO_STATUS_SUCCESS;
if (surface->pdf_stream.compressed) {
status = _cairo_output_stream_destroy (surface->output);
surface->output = surface->pdf_stream.old_output;
_cairo_pdf_operators_set_stream (&surface->pdf_operators, surface->output);
surface->pdf_stream.old_output = NULL;
_cairo_output_stream_printf (surface->output,
"\r\n");
}
length = _cairo_output_stream_get_position (surface->output) -
surface->pdf_stream.start_offset;
_cairo_output_stream_printf (surface->output,
"endstream\r\n"
"endobj\r\n");
_cairo_pdf_surface_update_object (surface,
surface->pdf_stream.length);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
" %ld\r\n"
"endobj\r\n",
surface->pdf_stream.length.id,
length);
surface->pdf_stream.active = FALSE;
if (status == CAIRO_STATUS_SUCCESS)
status = _cairo_output_stream_get_status (surface->output);
return status;
}
static void
_cairo_pdf_surface_write_memory_stream (cairo_pdf_surface_t *surface,
cairo_output_stream_t *mem_stream,
cairo_pdf_resource_t resource,
cairo_pdf_group_resources_t *resources,
cairo_bool_t is_knockout_group)
{
_cairo_pdf_surface_update_object (surface, resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /XObject\r\n"
" /Length %d\r\n",
resource.id,
_cairo_memory_stream_length (mem_stream));
if (surface->compress_content) {
_cairo_output_stream_printf (surface->output,
" /Filter /FlateDecode\r\n");
}
_cairo_output_stream_printf (surface->output,
" /Subtype /Form\r\n"
" /BBox [ 0 0 %f %f ]\r\n"
" /Group <<\r\n"
" /Type /Group\r\n"
" /S /Transparency\r\n"
" /CS /DeviceRGB\r\n",
surface->width,
surface->height);
if (is_knockout_group)
_cairo_output_stream_printf (surface->output,
" /K true\r\n");
_cairo_output_stream_printf (surface->output,
" >>\r\n"
" /Resources\r\n");
_cairo_pdf_surface_emit_group_resources (surface, resources);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"stream\r\n");
_cairo_memory_stream_copy (mem_stream, surface->output);
_cairo_output_stream_printf (surface->output,
"endstream\r\n"
"endobj\r\n");
}
static cairo_status_t
_cairo_pdf_surface_open_group (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t *resource)
{
cairo_status_t status;
assert (surface->pdf_stream.active == FALSE);
assert (surface->group_stream.active == FALSE);
surface->group_stream.active = TRUE;
surface->group_stream.mem_stream = _cairo_memory_stream_create ();
if (surface->compress_content) {
surface->group_stream.stream =
_cairo_deflate_stream_create (surface->group_stream.mem_stream);
} else {
surface->group_stream.stream = surface->group_stream.mem_stream;
}
status = _cairo_output_stream_get_status (surface->group_stream.stream);
surface->group_stream.old_output = surface->output;
surface->output = surface->group_stream.stream;
_cairo_pdf_operators_set_stream (&surface->pdf_operators, surface->output);
_cairo_pdf_group_resources_clear (&surface->resources);
if (resource) {
surface->group_stream.resource = *resource;
} else {
surface->group_stream.resource = _cairo_pdf_surface_new_object (surface);
if (surface->group_stream.resource.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
surface->group_stream.is_knockout = FALSE;
return status;
}
static cairo_status_t
_cairo_pdf_surface_open_knockout_group (cairo_pdf_surface_t *surface)
{
cairo_status_t status;
status = _cairo_pdf_surface_open_group (surface, NULL);
if (status)
return status;
surface->group_stream.is_knockout = TRUE;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_close_group (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t *group)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS, status2;
assert (surface->pdf_stream.active == FALSE);
assert (surface->group_stream.active == TRUE);
if (surface->compress_content) {
status = _cairo_output_stream_destroy (surface->group_stream.stream);
surface->group_stream.stream = NULL;
_cairo_output_stream_printf (surface->group_stream.mem_stream,
"\r\n");
}
surface->output = surface->group_stream.old_output;
_cairo_pdf_operators_set_stream (&surface->pdf_operators, surface->output);
surface->group_stream.active = FALSE;
_cairo_pdf_surface_write_memory_stream (surface,
surface->group_stream.mem_stream,
surface->group_stream.resource,
&surface->resources,
surface->group_stream.is_knockout);
if (group)
*group = surface->group_stream.resource;
status2 = _cairo_output_stream_destroy (surface->group_stream.mem_stream);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
surface->group_stream.mem_stream = NULL;
surface->group_stream.stream = NULL;
return status;
}
static cairo_status_t
_cairo_pdf_surface_open_content_stream (cairo_pdf_surface_t *surface,
cairo_bool_t is_form)
{
cairo_status_t status;
assert (surface->pdf_stream.active == FALSE);
assert (surface->group_stream.active == FALSE);
surface->content_resources = _cairo_pdf_surface_new_object (surface);
if (surface->content_resources.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (is_form) {
status =
_cairo_pdf_surface_open_stream (surface,
NULL,
surface->compress_content,
" /Type /XObject\r\n"
" /Subtype /Form\r\n"
" /BBox [ 0 0 %f %f ]\r\n"
" /Group <<\r\n"
" /Type /Group\r\n"
" /S /Transparency\r\n"
" /CS /DeviceRGB\r\n"
" >>\r\n"
" /Resources %d 0 R\r\n",
surface->width,
surface->height,
surface->content_resources.id);
if (status)
return status;
} else {
status =
_cairo_pdf_surface_open_stream (surface,
NULL,
surface->compress_content,
NULL);
if (status)
return status;
}
surface->content = surface->pdf_stream.self;
_cairo_output_stream_printf (surface->output, "q\r\n");
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_close_content_stream (cairo_pdf_surface_t *surface)
{
cairo_status_t status;
assert (surface->pdf_stream.active == TRUE);
assert (surface->group_stream.active == FALSE);
_cairo_output_stream_printf (surface->output, "Q\r\n");
status = _cairo_pdf_surface_close_stream (surface);
if (status)
return status;
_cairo_pdf_surface_update_object (surface, surface->content_resources);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n",
surface->content_resources.id);
_cairo_pdf_surface_emit_group_resources (surface, &surface->resources);
_cairo_output_stream_printf (surface->output,
"endobj\r\n");
return _cairo_output_stream_get_status (surface->output);
}
static cairo_surface_t *
_cairo_pdf_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
return _cairo_meta_surface_create (content, width, height);
}
static cairo_status_t
_cairo_pdf_surface_finish (void *abstract_surface)
{
cairo_pdf_surface_t *surface = abstract_surface;
long offset;
cairo_pdf_resource_t info, catalog;
cairo_status_t status, status2;
status = surface->base.status;
if (status == CAIRO_STATUS_SUCCESS)
status = _cairo_pdf_surface_emit_font_subsets (surface);
_cairo_pdf_surface_write_pages (surface);
info = _cairo_pdf_surface_write_info (surface);
if (info.id == 0 && status == CAIRO_STATUS_SUCCESS)
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
catalog = _cairo_pdf_surface_write_catalog (surface);
if (catalog.id == 0 && status == CAIRO_STATUS_SUCCESS)
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
offset = _cairo_pdf_surface_write_xref (surface);
_cairo_output_stream_printf (surface->output,
"trailer\r\n"
"<< /Size %d\r\n"
" /Root %d 0 R\r\n"
" /Info %d 0 R\r\n"
">>\r\n",
surface->next_available_resource.id,
catalog.id,
info.id);
_cairo_output_stream_printf (surface->output,
"startxref\r\n"
"%ld\r\n"
"%%%%EOF\r\n",
offset);
_cairo_pdf_operators_fini (&surface->pdf_operators);
/* close any active streams still open due to fatal errors */
status2 = _cairo_pdf_surface_close_stream (surface);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
if (surface->group_stream.stream != NULL) {
status2 = _cairo_output_stream_destroy (surface->group_stream.stream);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
}
if (surface->group_stream.mem_stream != NULL) {
status2 = _cairo_output_stream_destroy (surface->group_stream.mem_stream);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
}
if (surface->pdf_stream.active)
surface->output = surface->pdf_stream.old_output;
if (surface->group_stream.active)
surface->output = surface->group_stream.old_output;
/* and finish the pdf surface */
status2 = _cairo_output_stream_destroy (surface->output);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
_cairo_pdf_surface_clear (surface);
_cairo_pdf_group_resources_fini (&surface->resources);
_cairo_array_fini (&surface->objects);
_cairo_array_fini (&surface->pages);
_cairo_array_fini (&surface->rgb_linear_functions);
_cairo_array_fini (&surface->alpha_linear_functions);
_cairo_array_fini (&surface->patterns);
_cairo_array_fini (&surface->smask_groups);
_cairo_array_fini (&surface->fonts);
_cairo_array_fini (&surface->knockout_group);
if (surface->font_subsets) {
_cairo_scaled_font_subsets_destroy (surface->font_subsets);
surface->font_subsets = NULL;
}
return status;
}
static cairo_int_status_t
_cairo_pdf_surface_start_page (void *abstract_surface)
{
cairo_status_t status;
cairo_pdf_surface_t *surface = abstract_surface;
surface->has_fallback_images = FALSE;
_cairo_pdf_group_resources_clear (&surface->resources);
status = _cairo_pdf_surface_open_content_stream (surface, TRUE);
if (status)
return status;
return CAIRO_STATUS_SUCCESS;
}
static void *
compress_dup (const void *data, unsigned long data_size,
unsigned long *compressed_size)
{
void *compressed;
/* Bound calculation taken from zlib. */
*compressed_size = data_size + (data_size >> 12) + (data_size >> 14) + 11;
compressed = malloc (*compressed_size);
if (compressed == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
if (compress (compressed, compressed_size, data, data_size) != Z_OK) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
free (compressed);
compressed = NULL;
}
return compressed;
}
/* Emit alpha channel from the image into the given data, providing
* an id that can be used to reference the resulting SMask object.
*
* In the case that the alpha channel happens to be all opaque, then
* no SMask object will be emitted and *id_ret will be set to 0.
*/
static cairo_status_t
_cairo_pdf_surface_emit_smask (cairo_pdf_surface_t *surface,
cairo_image_surface_t *image,
cairo_pdf_resource_t *stream_ret)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
char *alpha, *alpha_compressed;
unsigned long alpha_size, alpha_compressed_size;
uint32_t *pixel32;
uint8_t *pixel8;
int i, x, y;
cairo_bool_t opaque;
uint8_t a;
int src_bit, dst_bit;
/* This is the only image format we support, which simplifies things. */
assert (image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8 ||
image->format == CAIRO_FORMAT_A1 );
stream_ret->id = 0;
if (image->format == CAIRO_FORMAT_A1)
alpha_size = (image->height * image->width + 7)/8;
else
alpha_size = image->height * image->width;
alpha = malloc (alpha_size);
if (alpha == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto CLEANUP;
}
opaque = TRUE;
i = 0;
src_bit = 0;
dst_bit = 7;
for (y = 0; y < image->height; y++) {
if (image->format == CAIRO_FORMAT_ARGB32) {
pixel32 = (uint32_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel32++) {
a = (*pixel32 & 0xff000000) >> 24;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
}
} else if (image->format == CAIRO_FORMAT_A8){
pixel8 = (uint8_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel8++) {
a = *pixel8;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
}
} else { /* image->format == CAIRO_FORMAT_A1 */
pixel8 = (uint8_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel8++) {
if (dst_bit == 7)
alpha[i] = 0;
if ((*pixel8 >> src_bit) & 1) {
opaque = FALSE;
alpha[i] |= (1 << dst_bit);
}
if (++src_bit > 7) {
src_bit = 0;
pixel8++;
}
if (--dst_bit < 0) {
dst_bit = 7;
i++;
}
}
}
}
/* Bail out without emitting smask if it's all opaque. */
if (opaque)
goto CLEANUP_ALPHA;
alpha_compressed = compress_dup (alpha, alpha_size, &alpha_compressed_size);
if (alpha_compressed == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto CLEANUP_ALPHA;
}
status = _cairo_pdf_surface_open_stream (surface,
NULL,
FALSE,
" /Type /XObject\r\n"
" /Subtype /Image\r\n"
" /Width %d\r\n"
" /Height %d\r\n"
" /ColorSpace /DeviceGray\r\n"
" /BitsPerComponent %d\r\n"
" /Filter /FlateDecode\r\n",
image->width, image->height,
image->format == CAIRO_FORMAT_A1 ? 1 : 8);
if (status)
goto CLEANUP_ALPHA_COMPRESSED;
*stream_ret = surface->pdf_stream.self;
_cairo_output_stream_write (surface->output, alpha_compressed, alpha_compressed_size);
_cairo_output_stream_printf (surface->output, "\r\n");
status = _cairo_pdf_surface_close_stream (surface);
CLEANUP_ALPHA_COMPRESSED:
free (alpha_compressed);
CLEANUP_ALPHA:
free (alpha);
CLEANUP:
return status;
}
/* Emit image data into the given surface, providing a resource that
* can be used to reference the data in image_ret. */
static cairo_status_t
_cairo_pdf_surface_emit_image (cairo_pdf_surface_t *surface,
cairo_image_surface_t *image,
cairo_pdf_resource_t *image_ret)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
char *rgb, *compressed;
unsigned long rgb_size, compressed_size;
uint32_t *pixel;
int i, x, y;
cairo_pdf_resource_t smask = {0}; /* squelch bogus compiler warning */
cairo_bool_t need_smask;
/* XXX: Need to rewrite this as a pdf_surface function with
* pause/resume of content_stream, (currently the only caller does
* the pause/resume already, but that is expected to change in the
* future). */
/* These are the only image formats we currently support, (which
* makes things a lot simpler here). This is enforced through
* _cairo_pdf_surface_analyze_operation which only accept source surfaces of
* CONTENT_COLOR or CONTENT_COLOR_ALPHA.
*/
assert (image->format == CAIRO_FORMAT_RGB24 ||
image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8 ||
image->format == CAIRO_FORMAT_A1);
rgb_size = image->height * image->width * 3;
rgb = malloc (rgb_size);
if (rgb == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto CLEANUP;
}
i = 0;
for (y = 0; y < image->height; y++) {
pixel = (uint32_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel++) {
/* XXX: We're un-premultiplying alpha here. My reading of the PDF
* specification suggests that we should be able to avoid having
* to do this by filling in the SMask's Matte dictionary
* appropriately, but my attempts to do that so far have
* failed. */
if (image->format == CAIRO_FORMAT_ARGB32) {
uint8_t a;
a = (*pixel & 0xff000000) >> 24;
if (a == 0) {
rgb[i++] = 0;
rgb[i++] = 0;
rgb[i++] = 0;
} else {
rgb[i++] = (((*pixel & 0xff0000) >> 16) * 255 + a / 2) / a;
rgb[i++] = (((*pixel & 0x00ff00) >> 8) * 255 + a / 2) / a;
rgb[i++] = (((*pixel & 0x0000ff) >> 0) * 255 + a / 2) / a;
}
} else if (image->format == CAIRO_FORMAT_RGB24) {
rgb[i++] = (*pixel & 0x00ff0000) >> 16;
rgb[i++] = (*pixel & 0x0000ff00) >> 8;
rgb[i++] = (*pixel & 0x000000ff) >> 0;
} else {
rgb[i++] = 0;
rgb[i++] = 0;
rgb[i++] = 0;
}
}
}
compressed = compress_dup (rgb, rgb_size, &compressed_size);
if (compressed == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto CLEANUP_RGB;
}
need_smask = FALSE;
if (image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8 ||
image->format == CAIRO_FORMAT_A1) {
status = _cairo_pdf_surface_emit_smask (surface, image, &smask);
if (status)
goto CLEANUP_COMPRESSED;
if (smask.id)
need_smask = TRUE;
}
#define IMAGE_DICTIONARY " /Type /XObject\r\n" \
" /Subtype /Image\r\n" \
" /Width %d\r\n" \
" /Height %d\r\n" \
" /ColorSpace /DeviceRGB\r\n" \
" /BitsPerComponent 8\r\n" \
" /Filter /FlateDecode\r\n"
if (need_smask)
status = _cairo_pdf_surface_open_stream (surface,
NULL,
FALSE,
IMAGE_DICTIONARY
" /SMask %d 0 R\r\n",
image->width, image->height,
smask.id);
else
status = _cairo_pdf_surface_open_stream (surface,
NULL,
FALSE,
IMAGE_DICTIONARY,
image->width, image->height);
if (status)
goto CLEANUP_COMPRESSED;
#undef IMAGE_DICTIONARY
*image_ret = surface->pdf_stream.self;
_cairo_output_stream_write (surface->output, compressed, compressed_size);
_cairo_output_stream_printf (surface->output, "\r\n");
status = _cairo_pdf_surface_close_stream (surface);
CLEANUP_COMPRESSED:
free (compressed);
CLEANUP_RGB:
free (rgb);
CLEANUP:
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_image_surface (cairo_pdf_surface_t *surface,
cairo_surface_pattern_t *pattern,
cairo_pdf_resource_t *resource,
int *width,
int *height)
{
cairo_surface_t *pat_surface;
cairo_surface_attributes_t pat_attr;
cairo_image_surface_t *image;
void *image_extra;
cairo_status_t status;
status = _cairo_pattern_acquire_surface (&pattern->base,
&surface->base,
0, 0, -1, -1,
&pat_surface, &pat_attr);
if (status)
return status;
status = _cairo_surface_acquire_source_image (pat_surface, &image, &image_extra);
if (status)
goto BAIL2;
status = _cairo_pdf_surface_emit_image (surface, image, resource);
if (status)
goto BAIL;
*width = image->width;
*height = image->height;
BAIL:
_cairo_surface_release_source_image (pat_surface, image, image_extra);
BAIL2:
_cairo_pattern_release_surface (&pattern->base, pat_surface, &pat_attr);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_meta_surface (cairo_pdf_surface_t *surface,
cairo_surface_t *meta_surface,
cairo_pdf_resource_t *resource)
{
double old_width, old_height;
cairo_matrix_t old_cairo_to_pdf;
cairo_paginated_mode_t old_paginated_mode;
cairo_rectangle_int16_t meta_extents;
cairo_status_t status;
int alpha = 0;
status = _cairo_surface_get_extents (meta_surface, &meta_extents);
if (status)
return status;
old_width = surface->width;
old_height = surface->height;
old_cairo_to_pdf = surface->cairo_to_pdf;
old_paginated_mode = surface->paginated_mode;
surface->width = meta_extents.width;
surface->height = meta_extents.height;
/* Patterns are emitted after fallback images. The paginated mode
* needs to be set to _RENDER while the meta surface is replayed
* back to this surface.
*/
surface->paginated_mode = CAIRO_PAGINATED_MODE_RENDER;
cairo_matrix_init (&surface->cairo_to_pdf, 1, 0, 0, -1, 0, surface->height);
_cairo_pdf_operators_set_cairo_to_pdf_matrix (&surface->pdf_operators,
surface->cairo_to_pdf);
_cairo_pdf_group_resources_clear (&surface->resources);
status = _cairo_pdf_surface_open_content_stream (surface, TRUE);
if (status)
return status;
*resource = surface->content;
if (cairo_surface_get_content (meta_surface) == CAIRO_CONTENT_COLOR) {
status = _cairo_pdf_surface_add_alpha (surface, 1.0, &alpha);
if (status)
goto CLEANUP_GROUP;
_cairo_output_stream_printf (surface->output,
"q /a%d gs 0 0 0 rg 0 0 %f %f re f Q\r\n",
alpha,
surface->width,
surface->height);
}
status = _cairo_meta_surface_replay_region (meta_surface, &surface->base,
CAIRO_META_REGION_NATIVE);
assert (status != CAIRO_INT_STATUS_UNSUPPORTED);
if (status)
goto CLEANUP_GROUP;
status = _cairo_pdf_surface_close_content_stream (surface);
CLEANUP_GROUP:
surface->width = old_width;
surface->height = old_height;
surface->paginated_mode = old_paginated_mode;
surface->cairo_to_pdf = old_cairo_to_pdf;
_cairo_pdf_operators_set_cairo_to_pdf_matrix (&surface->pdf_operators,
surface->cairo_to_pdf);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_surface_pattern (cairo_pdf_surface_t *surface,
cairo_pdf_pattern_t *pdf_pattern)
{
cairo_surface_pattern_t *pattern = (cairo_surface_pattern_t *) pdf_pattern->pattern;
cairo_status_t status;
cairo_pdf_resource_t pattern_resource = {0}; /* squelch bogus compiler warning */
cairo_matrix_t cairo_p2d, pdf_p2d;
cairo_extend_t extend = cairo_pattern_get_extend (&pattern->base);
double xstep, ystep;
cairo_rectangle_int16_t surface_extents;
int pattern_width = 0; /* squelch bogus compiler warning */
int pattern_height = 0; /* squelch bogus compiler warning */
int bbox_x, bbox_y;
if (_cairo_surface_is_meta (pattern->surface)) {
cairo_surface_t *meta_surface = pattern->surface;
cairo_rectangle_int16_t pattern_extents;
status = _cairo_pdf_surface_emit_meta_surface (surface,
meta_surface,
&pattern_resource);
if (status)
return status;
status = _cairo_surface_get_extents (meta_surface, &pattern_extents);
if (status)
return status;
pattern_width = pattern_extents.width;
pattern_height = pattern_extents.height;
} else {
status = _cairo_pdf_surface_emit_image_surface (surface,
pattern,
&pattern_resource,
&pattern_width,
&pattern_height);
if (status)
return status;
}
status = _cairo_surface_get_extents (&surface->base, &surface_extents);
if (status)
return status;
bbox_x = pattern_width;
bbox_y = pattern_height;
switch (extend) {
/* We implement EXTEND_PAD like EXTEND_NONE for now */
case CAIRO_EXTEND_PAD:
case CAIRO_EXTEND_NONE:
{
/* In PS/PDF, (as far as I can tell), all patterns are
* repeating. So we support cairo's EXTEND_NONE semantics
* by setting the repeat step size to a size large enough
* to guarantee that no more than a single occurrence will
* be visible.
*
* First, map the surface extents into pattern space (since
* xstep and ystep are in pattern space). Then use an upper
* bound on the length of the diagonal of the pattern image
* and the surface as repeat size. This guarantees to never
* repeat visibly.
*/
double x1 = 0.0, y1 = 0.0;
double x2 = surface->width, y2 = surface->height;
_cairo_matrix_transform_bounding_box (&pattern->base.matrix,
&x1, &y1, &x2, &y2,
NULL);
/* Rather than computing precise bounds of the union, just
* add the surface extents unconditionally. We only
* required an answer that's large enough, we don't really
* care if it's not as tight as possible.*/
xstep = ystep = ceil ((x2 - x1) + (y2 - y1) +
pattern_width + pattern_height);
}
break;
case CAIRO_EXTEND_REPEAT:
xstep = pattern_width;
ystep = pattern_height;
break;
case CAIRO_EXTEND_REFLECT:
bbox_x = pattern_width*2;
bbox_y = pattern_height*2;
xstep = bbox_x;
ystep = bbox_y;
break;
/* All the rest (if any) should have been analyzed away, so this
* case should be unreachable. */
default:
ASSERT_NOT_REACHED;
xstep = 0;
ystep = 0;
}
/* At this point, (that is, within the surface backend interface),
* the pattern's matrix maps from cairo's device space to cairo's
* pattern space, (both with their origin at the upper-left, and
* cairo's pattern space of size width,height).
*
* Then, we must emit a PDF pattern object that maps from its own
* pattern space, (which has a size that we establish in the BBox
* dictionary entry), to the PDF page's *initial* space, (which
* does not benefit from the Y-axis flipping matrix that we emit
* on each page). So the PDF patterns matrix maps from a
* (width,height) pattern space to a device space with the origin
* in the lower-left corner.
*
* So to handle all of that, we start with an identity matrix for
* the PDF pattern to device matrix. We translate it up by the
* image height then flip it in the Y direction, (moving us from
* the PDF origin to cairo's origin). We then multiply in the
* inverse of the cairo pattern matrix, (since it maps from device
* to pattern, while we're setting up pattern to device). Finally,
* we translate back down by the image height and flip again to
* end up at the lower-left origin that PDF expects.
*
* Additionally, within the stream that paints the pattern itself,
* we are using a PDF image object that has a size of (1,1) so we
* have to scale it up by the image width and height to fill our
* pattern cell.
*/
cairo_p2d = pattern->base.matrix;
status = cairo_matrix_invert (&cairo_p2d);
/* cairo_pattern_set_matrix ensures the matrix is invertible */
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_init_identity (&pdf_p2d);
cairo_matrix_translate (&pdf_p2d, 0.0, surface_extents.height);
cairo_matrix_scale (&pdf_p2d, 1.0, -1.0);
cairo_matrix_multiply (&pdf_p2d, &cairo_p2d, &pdf_p2d);
cairo_matrix_translate (&pdf_p2d, 0.0, pattern_height);
cairo_matrix_scale (&pdf_p2d, 1.0, -1.0);
_cairo_pdf_surface_update_object (surface, pdf_pattern->pattern_res);
status = _cairo_pdf_surface_open_stream (surface,
&pdf_pattern->pattern_res,
FALSE,
" /PatternType 1\r\n"
" /BBox [0 0 %d %d]\r\n"
" /XStep %f\r\n"
" /YStep %f\r\n"
" /TilingType 1\r\n"
" /PaintType 1\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Resources << /XObject << /x%d %d 0 R >> >>\r\n",
bbox_x, bbox_y,
xstep, ystep,
pdf_p2d.xx, pdf_p2d.yx,
pdf_p2d.xy, pdf_p2d.yy,
pdf_p2d.x0, pdf_p2d.y0,
pattern_resource.id,
pattern_resource.id);
if (status)
return status;
if (_cairo_surface_is_meta (pattern->surface)) {
if (extend == CAIRO_EXTEND_REFLECT) {
_cairo_output_stream_printf (surface->output,
"q 0 0 %d %d re W n /x%d Do Q\r\n"
"q -1 0 0 1 %d 0 cm 0 0 %d %d re W n /x%d Do Q\r\n"
"q 1 0 0 -1 0 %d cm 0 0 %d %d re W n /x%d Do Q\r\n"
"q -1 0 0 -1 %d %d cm 0 0 %d %d re W n /x%d Do Q\r\n",
pattern_width, pattern_height,
pattern_resource.id,
pattern_width*2, pattern_width, pattern_height,
pattern_resource.id,
pattern_height*2, pattern_width, pattern_height,
pattern_resource.id,
pattern_width*2, pattern_height*2, pattern_width, pattern_height,
pattern_resource.id);
} else {
_cairo_output_stream_printf (surface->output,
"/x%d Do\r\n",
pattern_resource.id);
}
} else {
_cairo_output_stream_printf (surface->output,
"q %d 0 0 %d 0 0 cm /x%d Do Q\r\n",
pattern_width, pattern_height,
pattern_resource.id);
}
status = _cairo_pdf_surface_close_stream (surface);
if (status)
return status;
return _cairo_output_stream_get_status (surface->output);
}
typedef struct _cairo_pdf_color_stop {
double offset;
double color[4];
cairo_pdf_resource_t resource;
} cairo_pdf_color_stop_t;
static cairo_status_t
cairo_pdf_surface_emit_rgb_linear_function (cairo_pdf_surface_t *surface,
cairo_pdf_color_stop_t *stop1,
cairo_pdf_color_stop_t *stop2,
cairo_pdf_resource_t *function)
{
int num_elems, i;
cairo_pdf_rgb_linear_function_t elem;
cairo_pdf_resource_t res;
cairo_status_t status;
num_elems = _cairo_array_num_elements (&surface->rgb_linear_functions);
for (i = 0; i < num_elems; i++) {
_cairo_array_copy_element (&surface->rgb_linear_functions, i, &elem);
if (memcmp (&elem.color1[0], &stop1->color[0], sizeof (double)*3) != 0)
continue;
if (memcmp (&elem.color2[0], &stop2->color[0], sizeof (double)*3) != 0)
continue;
*function = elem.resource;
return CAIRO_STATUS_SUCCESS;
}
res = _cairo_pdf_surface_new_object (surface);
if (res.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /FunctionType 2\r\n"
" /Domain [ 0 1 ]\r\n"
" /C0 [ %f %f %f ]\r\n"
" /C1 [ %f %f %f ]\r\n"
" /N 1\r\n"
">>\r\n"
"endobj\r\n",
res.id,
stop1->color[0],
stop1->color[1],
stop1->color[2],
stop2->color[0],
stop2->color[1],
stop2->color[2]);
elem.resource = res;
memcpy (&elem.color1[0], &stop1->color[0], sizeof (double)*3);
memcpy (&elem.color2[0], &stop2->color[0], sizeof (double)*3);
status = _cairo_array_append (&surface->rgb_linear_functions, &elem);
*function = res;
return status;
}
static cairo_status_t
cairo_pdf_surface_emit_alpha_linear_function (cairo_pdf_surface_t *surface,
cairo_pdf_color_stop_t *stop1,
cairo_pdf_color_stop_t *stop2,
cairo_pdf_resource_t *function)
{
int num_elems, i;
cairo_pdf_alpha_linear_function_t elem;
cairo_pdf_resource_t res;
cairo_status_t status;
num_elems = _cairo_array_num_elements (&surface->alpha_linear_functions);
for (i = 0; i < num_elems; i++) {
_cairo_array_copy_element (&surface->alpha_linear_functions, i, &elem);
if (elem.alpha1 != stop1->color[3])
continue;
if (elem.alpha2 != stop2->color[3])
continue;
*function = elem.resource;
return CAIRO_STATUS_SUCCESS;
}
res = _cairo_pdf_surface_new_object (surface);
if (res.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /FunctionType 2\r\n"
" /Domain [ 0 1 ]\r\n"
" /C0 [ %f ]\r\n"
" /C1 [ %f ]\r\n"
" /N 1\r\n"
">>\r\n"
"endobj\r\n",
res.id,
stop1->color[3],
stop2->color[3]);
elem.resource = res;
elem.alpha1 = stop1->color[3];
elem.alpha2 = stop2->color[3];
status = _cairo_array_append (&surface->alpha_linear_functions, &elem);
*function = res;
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_stitched_colorgradient (cairo_pdf_surface_t *surface,
unsigned int n_stops,
cairo_pdf_color_stop_t *stops,
cairo_bool_t is_alpha,
cairo_pdf_resource_t *function)
{
cairo_pdf_resource_t res;
unsigned int i;
cairo_status_t status;
/* emit linear gradients between pairs of subsequent stops... */
for (i = 0; i < n_stops-1; i++) {
if (is_alpha) {
status = cairo_pdf_surface_emit_alpha_linear_function (surface,
&stops[i],
&stops[i+1],
&stops[i].resource);
if (status)
return status;
} else {
status = cairo_pdf_surface_emit_rgb_linear_function (surface,
&stops[i],
&stops[i+1],
&stops[i].resource);
if (status)
return status;
}
}
/* ... and stitch them together */
res = _cairo_pdf_surface_new_object (surface);
if (res.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /FunctionType 3\r\n"
" /Domain [ %f %f ]\r\n",
res.id,
stops[0].offset,
stops[n_stops - 1].offset);
_cairo_output_stream_printf (surface->output,
" /Functions [ ");
for (i = 0; i < n_stops-1; i++)
_cairo_output_stream_printf (surface->output,
"%d 0 R ", stops[i].resource.id);
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
" /Bounds [ ");
for (i = 1; i < n_stops-1; i++)
_cairo_output_stream_printf (surface->output,
"%f ", stops[i].offset);
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
" /Encode [ ");
for (i = 1; i < n_stops; i++)
_cairo_output_stream_printf (surface->output,
"0 1 ");
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
*function = res;
return _cairo_output_stream_get_status (surface->output);
}
static void
calc_gradient_color (cairo_pdf_color_stop_t *new_stop,
cairo_pdf_color_stop_t *stop1,
cairo_pdf_color_stop_t *stop2)
{
int i;
double offset = stop1->offset / (stop1->offset + 1.0 - stop2->offset);
for (i = 0; i < 4; i++)
new_stop->color[i] = stop1->color[i] + offset*(stop2->color[i] - stop1->color[i]);
}
#define COLOR_STOP_EPSILON 1e-6
static cairo_status_t
_cairo_pdf_surface_emit_pattern_stops (cairo_pdf_surface_t *surface,
cairo_gradient_pattern_t *pattern,
cairo_pdf_resource_t *color_function,
cairo_pdf_resource_t *alpha_function)
{
cairo_pdf_color_stop_t *allstops, *stops;
unsigned int n_stops;
unsigned int i;
cairo_bool_t emit_alpha = FALSE;
cairo_status_t status;
color_function->id = 0;
alpha_function->id = 0;
allstops = _cairo_malloc_ab ((pattern->n_stops + 2), sizeof (cairo_pdf_color_stop_t));
if (allstops == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
stops = &allstops[1];
n_stops = pattern->n_stops;
for (i = 0; i < n_stops; i++) {
stops[i].color[0] = pattern->stops[i].color.red;
stops[i].color[1] = pattern->stops[i].color.green;
stops[i].color[2] = pattern->stops[i].color.blue;
stops[i].color[3] = pattern->stops[i].color.alpha;
if (!CAIRO_ALPHA_IS_OPAQUE (stops[i].color[3]))
emit_alpha = TRUE;
stops[i].offset = _cairo_fixed_to_double (pattern->stops[i].x);
}
if (pattern->base.extend == CAIRO_EXTEND_REPEAT ||
pattern->base.extend == CAIRO_EXTEND_REFLECT) {
if (stops[0].offset > COLOR_STOP_EPSILON) {
if (pattern->base.extend == CAIRO_EXTEND_REFLECT)
memcpy (allstops, stops, sizeof (cairo_pdf_color_stop_t));
else
calc_gradient_color (&allstops[0], &stops[0], &stops[n_stops-1]);
stops = allstops;
n_stops++;
}
stops[0].offset = 0.0;
if (stops[n_stops-1].offset < 1.0 - COLOR_STOP_EPSILON) {
if (pattern->base.extend == CAIRO_EXTEND_REFLECT) {
memcpy (&stops[n_stops],
&stops[n_stops - 1],
sizeof (cairo_pdf_color_stop_t));
} else {
calc_gradient_color (&stops[n_stops], &stops[0], &stops[n_stops-1]);
}
n_stops++;
}
stops[n_stops-1].offset = 1.0;
}
if (n_stops == 2) {
/* no need for stitched function */
status = cairo_pdf_surface_emit_rgb_linear_function (surface,
&stops[0],
&stops[1],
color_function);
if (status)
goto BAIL;
if (emit_alpha) {
status = cairo_pdf_surface_emit_alpha_linear_function (surface,
&stops[0],
&stops[1],
alpha_function);
if (status)
goto BAIL;
}
} else {
/* multiple stops: stitch. XXX possible optimization: regularly spaced
* stops do not require stitching. XXX */
status = _cairo_pdf_surface_emit_stitched_colorgradient (surface,
n_stops,
stops,
FALSE,
color_function);
if (status)
goto BAIL;
if (emit_alpha) {
status = _cairo_pdf_surface_emit_stitched_colorgradient (surface,
n_stops,
stops,
TRUE,
alpha_function);
if (status)
goto BAIL;
}
}
BAIL:
free (allstops);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_repeating_function (cairo_pdf_surface_t *surface,
cairo_gradient_pattern_t *pattern,
cairo_pdf_resource_t *function,
int begin,
int end)
{
cairo_pdf_resource_t res;
int i;
res = _cairo_pdf_surface_new_object (surface);
if (res.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /FunctionType 3\r\n"
" /Domain [ %d %d ]\r\n",
res.id,
begin,
end);
_cairo_output_stream_printf (surface->output,
" /Functions [ ");
for (i = begin; i < end; i++)
_cairo_output_stream_printf (surface->output,
"%d 0 R ", function->id);
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
" /Bounds [ ");
for (i = begin + 1; i < end; i++)
_cairo_output_stream_printf (surface->output,
"%d ", i);
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
" /Encode [ ");
for (i = begin; i < end; i++) {
if ((i % 2) && pattern->base.extend == CAIRO_EXTEND_REFLECT) {
_cairo_output_stream_printf (surface->output,
"1 0 ");
} else {
_cairo_output_stream_printf (surface->output,
"0 1 ");
}
}
_cairo_output_stream_printf (surface->output,
"]\r\n");
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
*function = res;
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
cairo_pdf_surface_emit_transparency_group (cairo_pdf_surface_t *surface,
cairo_pdf_resource_t gstate_resource,
cairo_pdf_resource_t gradient_mask)
{
cairo_pdf_resource_t smask_resource;
cairo_status_t status;
status = _cairo_pdf_surface_open_stream (surface,
NULL,
surface->compress_content,
" /Type /XObject\r\n"
" /Subtype /Form\r\n"
" /FormType 1\r\n"
" /BBox [ 0 0 %f %f ]\r\n"
" /Resources\r\n"
" << /ExtGState\r\n"
" << /a0 << /ca 1 /CA 1 >>"
" >>\r\n"
" /Pattern\r\n"
" << /p%d %d 0 R >>\r\n"
" >>\r\n"
" /Group\r\n"
" << /Type /Group\r\n"
" /S /Transparency\r\n"
" /CS /DeviceGray\r\n"
" >>\r\n",
surface->width,
surface->height,
gradient_mask.id,
gradient_mask.id);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q\r\n"
"/a0 gs\r\n"
"/Pattern cs /p%d scn\r\n"
"0 0 %f %f re\r\n"
"f\r\n"
"Q\r\n",
gradient_mask.id,
surface->width,
surface->height);
status = _cairo_pdf_surface_close_stream (surface);
if (status)
return status;
smask_resource = _cairo_pdf_surface_new_object (surface);
if (smask_resource.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Mask\r\n"
" /S /Luminosity\r\n"
" /G %d 0 R\r\n"
">>\r\n"
"endobj\r\n",
smask_resource.id,
surface->pdf_stream.self.id);
/* Create GState which uses the transparency group as an SMask. */
_cairo_pdf_surface_update_object (surface, gstate_resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /ExtGState\r\n"
" /SMask %d 0 R\r\n"
" /ca 1\r\n"
" /CA 1\r\n"
" /AIS false\r\n"
">>\r\n"
"endobj\r\n",
gstate_resource.id,
smask_resource.id);
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_emit_linear_pattern (cairo_pdf_surface_t *surface,
cairo_pdf_pattern_t *pdf_pattern)
{
cairo_linear_pattern_t *pattern = (cairo_linear_pattern_t *) pdf_pattern->pattern;
cairo_pdf_resource_t color_function, alpha_function;
double x1, y1, x2, y2;
double _x1, _y1, _x2, _y2;
cairo_matrix_t pat_to_pdf;
cairo_extend_t extend;
cairo_status_t status;
cairo_gradient_pattern_t *gradient = &pattern->base;
double first_stop, last_stop;
int repeat_begin = 0, repeat_end = 1;
assert (pattern->base.n_stops != 0);
extend = cairo_pattern_get_extend (pdf_pattern->pattern);
pat_to_pdf = pattern->base.base.matrix;
status = cairo_matrix_invert (&pat_to_pdf);
/* cairo_pattern_set_matrix ensures the matrix is invertible */
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (&pat_to_pdf, &pat_to_pdf, &surface->cairo_to_pdf);
first_stop = _cairo_fixed_to_double (gradient->stops[0].x);
last_stop = _cairo_fixed_to_double (gradient->stops[gradient->n_stops - 1].x);
if (pattern->base.base.extend == CAIRO_EXTEND_REPEAT ||
pattern->base.base.extend == CAIRO_EXTEND_REFLECT) {
double dx, dy;
int x_rep = 0, y_rep = 0;
x1 = _cairo_fixed_to_double (pattern->p1.x);
y1 = _cairo_fixed_to_double (pattern->p1.y);
cairo_matrix_transform_point (&pat_to_pdf, &x1, &y1);
x2 = _cairo_fixed_to_double (pattern->p2.x);
y2 = _cairo_fixed_to_double (pattern->p2.y);
cairo_matrix_transform_point (&pat_to_pdf, &x2, &y2);
dx = fabs (x2 - x1);
dy = fabs (y2 - y1);
if (dx > 1e-6)
x_rep = (int) ceil (surface->width/dx);
if (dy > 1e-6)
y_rep = (int) ceil (surface->height/dy);
repeat_end = MAX (x_rep, y_rep);
repeat_begin = -repeat_end;
first_stop = repeat_begin;
last_stop = repeat_end;
}
/* PDF requires the first and last stop to be the same as the line
* coordinates. For repeating patterns this moves the line
* coordinates out to the begin/end of the repeating function. For
* non repeating patterns this may move the line coordinates in if
* there are not stops at offset 0 and 1. */
x1 = _cairo_fixed_to_double (pattern->p1.x);
y1 = _cairo_fixed_to_double (pattern->p1.y);
x2 = _cairo_fixed_to_double (pattern->p2.x);
y2 = _cairo_fixed_to_double (pattern->p2.y);
_x1 = x1 + (x2 - x1)*first_stop;
_y1 = y1 + (y2 - y1)*first_stop;
_x2 = x1 + (x2 - x1)*last_stop;
_y2 = y1 + (y2 - y1)*last_stop;
x1 = _x1;
x2 = _x2;
y1 = _y1;
y2 = _y2;
/* For EXTEND_NONE and EXTEND_PAD if there are only two stops a
* Type 2 function is used by itself without a stitching
* function. Type 2 functions always have the domain [0 1] */
if ((pattern->base.base.extend == CAIRO_EXTEND_NONE ||
pattern->base.base.extend == CAIRO_EXTEND_PAD) &&
gradient->n_stops == 2) {
first_stop = 0.0;
last_stop = 1.0;
}
status = _cairo_pdf_surface_emit_pattern_stops (surface,
&pattern->base,
&color_function,
&alpha_function);
if (status)
return status;
if (pattern->base.base.extend == CAIRO_EXTEND_REPEAT ||
pattern->base.base.extend == CAIRO_EXTEND_REFLECT) {
status = _cairo_pdf_surface_emit_repeating_function (surface,
&pattern->base,
&color_function,
repeat_begin,
repeat_end);
if (status)
return status;
if (alpha_function.id != 0) {
status = _cairo_pdf_surface_emit_repeating_function (surface,
&pattern->base,
&alpha_function,
repeat_begin,
repeat_end);
if (status)
return status;
}
}
_cairo_pdf_surface_update_object (surface, pdf_pattern->pattern_res);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Shading\r\n"
" << /ShadingType 2\r\n"
" /ColorSpace /DeviceRGB\r\n"
" /Coords [ %f %f %f %f ]\r\n"
" /Domain [ %f %f ]\r\n"
" /Function %d 0 R\r\n",
pdf_pattern->pattern_res.id,
pat_to_pdf.xx, pat_to_pdf.yx,
pat_to_pdf.xy, pat_to_pdf.yy,
pat_to_pdf.x0, pat_to_pdf.y0,
x1, y1, x2, y2,
first_stop, last_stop,
color_function.id);
if (extend == CAIRO_EXTEND_PAD) {
_cairo_output_stream_printf (surface->output,
" /Extend [ true true ]\r\n");
} else {
_cairo_output_stream_printf (surface->output,
" /Extend [ false false ]\r\n");
}
_cairo_output_stream_printf (surface->output,
" >>\r\n"
">>\r\n"
"endobj\r\n");
if (alpha_function.id != 0) {
cairo_pdf_resource_t mask_resource;
assert (pdf_pattern->gstate_res.id != 0);
/* Create pattern for SMask. */
mask_resource = _cairo_pdf_surface_new_object (surface);
if (mask_resource.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Shading\r\n"
" << /ShadingType 2\r\n"
" /ColorSpace /DeviceGray\r\n"
" /Coords [ %f %f %f %f ]\r\n"
" /Domain [ %f %f ]\r\n"
" /Function %d 0 R\r\n",
mask_resource.id,
pat_to_pdf.xx, pat_to_pdf.yx,
pat_to_pdf.xy, pat_to_pdf.yy,
pat_to_pdf.x0, pat_to_pdf.y0,
x1, y1, x2, y2,
first_stop, last_stop,
alpha_function.id);
if (extend == CAIRO_EXTEND_PAD) {
_cairo_output_stream_printf (surface->output,
" /Extend [ true true ]\r\n");
} else {
_cairo_output_stream_printf (surface->output,
" /Extend [ false false ]\r\n");
}
_cairo_output_stream_printf (surface->output,
" >>\r\n"
">>\r\n"
"endobj\r\n");
status = _cairo_pdf_surface_add_pattern (surface, mask_resource);
if (status)
return status;
status = cairo_pdf_surface_emit_transparency_group (surface,
pdf_pattern->gstate_res,
mask_resource);
if (status)
return status;
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_emit_radial_pattern (cairo_pdf_surface_t *surface,
cairo_pdf_pattern_t *pdf_pattern)
{
cairo_pdf_resource_t color_function, alpha_function;
double x1, y1, x2, y2, r1, r2;
cairo_matrix_t pat_to_pdf;
cairo_extend_t extend;
cairo_status_t status;
cairo_radial_pattern_t *pattern = (cairo_radial_pattern_t *) pdf_pattern->pattern;
assert (pattern->base.n_stops != 0);
extend = cairo_pattern_get_extend (pdf_pattern->pattern);
status = _cairo_pdf_surface_emit_pattern_stops (surface,
&pattern->base,
&color_function,
&alpha_function);
if (status)
return status;
pat_to_pdf = pattern->base.base.matrix;
status = cairo_matrix_invert (&pat_to_pdf);
/* cairo_pattern_set_matrix ensures the matrix is invertible */
assert (status == CAIRO_STATUS_SUCCESS);
cairo_matrix_multiply (&pat_to_pdf, &pat_to_pdf, &surface->cairo_to_pdf);
x1 = _cairo_fixed_to_double (pattern->c1.x);
y1 = _cairo_fixed_to_double (pattern->c1.y);
r1 = _cairo_fixed_to_double (pattern->r1);
x2 = _cairo_fixed_to_double (pattern->c2.x);
y2 = _cairo_fixed_to_double (pattern->c2.y);
r2 = _cairo_fixed_to_double (pattern->r2);
_cairo_pdf_surface_update_object (surface, pdf_pattern->pattern_res);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Shading\r\n"
" << /ShadingType 3\r\n"
" /ColorSpace /DeviceRGB\r\n"
" /Coords [ %f %f %f %f %f %f ]\r\n"
" /Function %d 0 R\r\n",
pdf_pattern->pattern_res.id,
pat_to_pdf.xx, pat_to_pdf.yx,
pat_to_pdf.xy, pat_to_pdf.yy,
pat_to_pdf.x0, pat_to_pdf.y0,
x1, y1, r1, x2, y2, r2,
color_function.id);
if (extend == CAIRO_EXTEND_PAD) {
_cairo_output_stream_printf (surface->output,
" /Extend [ true true ]\r\n");
} else {
_cairo_output_stream_printf (surface->output,
" /Extend [ false false ]\r\n");
}
_cairo_output_stream_printf (surface->output,
" >>\r\n"
">>\r\n"
"endobj\r\n");
if (alpha_function.id != 0) {
cairo_pdf_resource_t mask_resource;
assert (pdf_pattern->gstate_res.id != 0);
/* Create pattern for SMask. */
mask_resource = _cairo_pdf_surface_new_object (surface);
if (mask_resource.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Shading\r\n"
" << /ShadingType 3\r\n"
" /ColorSpace /DeviceGray\r\n"
" /Coords [ %f %f %f %f %f %f ]\r\n"
" /Function %d 0 R\r\n",
mask_resource.id,
pat_to_pdf.xx, pat_to_pdf.yx,
pat_to_pdf.xy, pat_to_pdf.yy,
pat_to_pdf.x0, pat_to_pdf.y0,
x1, y1, r1, x2, y2, r2,
alpha_function.id);
if (extend == CAIRO_EXTEND_PAD) {
_cairo_output_stream_printf (surface->output,
" /Extend [ true true ]\r\n");
} else {
_cairo_output_stream_printf (surface->output,
" /Extend [ false false ]\r\n");
}
_cairo_output_stream_printf (surface->output,
" >>\r\n"
">>\r\n"
"endobj\r\n");
status = cairo_pdf_surface_emit_transparency_group (surface,
pdf_pattern->gstate_res,
mask_resource);
if (status)
return status;
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_emit_pattern (cairo_pdf_surface_t *surface, cairo_pdf_pattern_t *pdf_pattern)
{
switch (pdf_pattern->pattern->type) {
case CAIRO_PATTERN_TYPE_SOLID:
ASSERT_NOT_REACHED;
break;
case CAIRO_PATTERN_TYPE_SURFACE:
return _cairo_pdf_surface_emit_surface_pattern (surface, pdf_pattern);
case CAIRO_PATTERN_TYPE_LINEAR:
return _cairo_pdf_surface_emit_linear_pattern (surface, pdf_pattern);
case CAIRO_PATTERN_TYPE_RADIAL:
return _cairo_pdf_surface_emit_radial_pattern (surface, pdf_pattern);
}
ASSERT_NOT_REACHED;
return _cairo_error (CAIRO_STATUS_PATTERN_TYPE_MISMATCH);
}
static cairo_status_t
_cairo_pdf_surface_select_pattern (cairo_pdf_surface_t *surface,
cairo_pattern_t *pattern,
cairo_pdf_resource_t pattern_res,
cairo_bool_t is_stroke)
{
cairo_status_t status;
int alpha;
if (pattern->type == CAIRO_PATTERN_TYPE_SOLID) {
cairo_solid_pattern_t *solid_pattern = (cairo_solid_pattern_t *) pattern;
status = _cairo_pdf_surface_add_alpha (surface, solid_pattern->color.alpha, &alpha);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q %f %f %f ",
solid_pattern->color.red,
solid_pattern->color.green,
solid_pattern->color.blue);
if (is_stroke)
_cairo_output_stream_printf (surface->output, "RG ");
else
_cairo_output_stream_printf (surface->output, "rg ");
_cairo_output_stream_printf (surface->output,
"/a%d gs\r\n",
alpha);
} else {
status = _cairo_pdf_surface_add_alpha (surface, 1.0, &alpha);
if (status)
return status;
status = _cairo_pdf_surface_add_pattern (surface, pattern_res);
if (status)
return status;
if (is_stroke) {
_cairo_output_stream_printf (surface->output,
"q /Pattern CS /p%d SCN ",
pattern_res.id);
} else {
_cairo_output_stream_printf (surface->output,
"q /Pattern cs /p%d scn ",
pattern_res.id);
}
_cairo_output_stream_printf (surface->output,
"/a%d gs\r\n",
alpha);
}
return _cairo_output_stream_get_status (surface->output);
}
static void
_cairo_pdf_surface_unselect_pattern (cairo_pdf_surface_t *surface)
{
_cairo_output_stream_printf (surface->output, "Q\r\n");
}
static cairo_int_status_t
_cairo_pdf_surface_show_page (void *abstract_surface)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_int_status_t status;
status = _cairo_pdf_surface_close_content_stream (surface);
if (status)
return status;
status = _cairo_pdf_surface_write_page (surface);
if (status)
return status;
_cairo_pdf_surface_clear (surface);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_pdf_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_pdf_surface_t *surface = abstract_surface;
rectangle->x = 0;
rectangle->y = 0;
/* XXX: The conversion to integers here is pretty bogus, (not to
* mention the arbitrary limitation of width to a short(!). We
* may need to come up with a better interface for get_size.
*/
rectangle->width = (int) ceil (surface->width);
rectangle->height = (int) ceil (surface->height);
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_pdf_surface_intersect_clip_path (void *abstract_surface,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_pdf_surface_t *surface = abstract_surface;
if (path == NULL) {
_cairo_output_stream_printf (surface->output, "Q q\r\n");
return CAIRO_STATUS_SUCCESS;
}
return _cairo_pdf_operators_clip (&surface->pdf_operators, path, fill_rule);
}
static void
_cairo_pdf_surface_get_font_options (void *abstract_surface,
cairo_font_options_t *options)
{
_cairo_font_options_init_default (options);
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_OFF);
cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_GRAY);
}
static cairo_pdf_resource_t
_cairo_pdf_surface_write_info (cairo_pdf_surface_t *surface)
{
cairo_pdf_resource_t info;
info = _cairo_pdf_surface_new_object (surface);
if (info.id == 0)
return info;
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Creator (cairo %s (http://cairographics.org))\r\n"
" /Producer (cairo %s (http://cairographics.org))\r\n"
">>\r\n"
"endobj\r\n",
info.id,
cairo_version_string (),
cairo_version_string ());
return info;
}
static void
_cairo_pdf_surface_write_pages (cairo_pdf_surface_t *surface)
{
cairo_pdf_resource_t page;
int num_pages, i;
_cairo_pdf_surface_update_object (surface, surface->pages_resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Pages\r\n"
" /Kids [ ",
surface->pages_resource.id);
num_pages = _cairo_array_num_elements (&surface->pages);
for (i = 0; i < num_pages; i++) {
_cairo_array_copy_element (&surface->pages, i, &page);
_cairo_output_stream_printf (surface->output, "%d 0 R ", page.id);
}
_cairo_output_stream_printf (surface->output, "]\r\n");
_cairo_output_stream_printf (surface->output, " /Count %d\r\n", num_pages);
/* TODO: Figure out which other defaults to be inherited by /Page
* objects. */
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
}
static cairo_int_status_t
_cairo_pdf_surface_emit_to_unicode_stream (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset,
cairo_bool_t is_composite,
cairo_pdf_resource_t *stream)
{
const cairo_scaled_font_backend_t *backend;
unsigned int i, num_bfchar;
cairo_int_status_t status;
stream->id = 0;
if (font_subset->to_unicode == NULL)
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_truetype_create_glyph_to_unicode_map (font_subset);
if (status) {
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
backend = font_subset->scaled_font->backend;
if (backend->map_glyphs_to_unicode == NULL)
return CAIRO_INT_STATUS_UNSUPPORTED;
status = backend->map_glyphs_to_unicode (font_subset->scaled_font,
font_subset);
if (status)
return status;
}
status = _cairo_pdf_surface_open_stream (surface,
NULL,
surface->compress_content,
NULL);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"/CIDInit /ProcSet findresource begin\r\n"
"12 dict begin\r\n"
"begincmap\r\n"
"/CIDSystemInfo\r\n"
"<< /Registry (Adobe)\r\n"
" /Ordering (UCS)\r\n"
" /Supplement 0\r\n"
">> def\r\n"
"/CMapName /Adobe-Identity-UCS def\r\n"
"/CMapType 2 def\r\n"
"1 begincodespacerange\r\n");
if (is_composite) {
_cairo_output_stream_printf (surface->output,
"<0000> <ffff>\r\n");
} else {
_cairo_output_stream_printf (surface->output,
"<00> <ff>\r\n");
}
_cairo_output_stream_printf (surface->output,
"endcodespacerange\r\n");
num_bfchar = font_subset->num_glyphs - 1;
/* The CMap specification has a limit of 100 characters per beginbfchar operator */
_cairo_output_stream_printf (surface->output,
"%d beginbfchar\r\n",
num_bfchar > 100 ? 100 : num_bfchar);
for (i = 0; i < num_bfchar; i++) {
if (i != 0 && i % 100 == 0) {
_cairo_output_stream_printf (surface->output,
"endbfchar\r\n"
"%d beginbfchar\r\n",
num_bfchar - i > 100 ? 100 : num_bfchar - i);
}
if (is_composite) {
_cairo_output_stream_printf (surface->output,
"<%04x> <%04x>\r\n",
i + 1, font_subset->to_unicode[i + 1]);
} else {
_cairo_output_stream_printf (surface->output,
"<%02x> <%04x>\r\n",
i + 1, font_subset->to_unicode[i + 1]);
}
}
_cairo_output_stream_printf (surface->output,
"endbfchar\r\n");
_cairo_output_stream_printf (surface->output,
"endcmap\r\n"
"CMapName currentdict /CMap defineresource pop\r\n"
"end\r\n"
"end\r\n");
*stream = surface->pdf_stream.self;
return _cairo_pdf_surface_close_stream (surface);
}
static cairo_status_t
_cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset,
cairo_cff_subset_t *subset)
{
cairo_pdf_resource_t stream, descriptor, cidfont_dict;
cairo_pdf_resource_t subset_resource, to_unicode_stream;
cairo_pdf_font_t font;
unsigned long compressed_length;
char *compressed;
unsigned int i;
cairo_status_t status;
subset_resource = _cairo_pdf_surface_get_font_resource (surface,
font_subset->font_id,
font_subset->subset_id);
if (subset_resource.id == 0)
return CAIRO_STATUS_SUCCESS;
compressed = compress_dup (subset->data, subset->data_length, &compressed_length);
if (compressed == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
stream = _cairo_pdf_surface_new_object (surface);
if (stream.id == 0) {
free (compressed);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Filter /FlateDecode\r\n"
" /Length %lu\r\n"
" /Subtype /CIDFontType0C\r\n"
">>\r\n"
"stream\r\n",
stream.id,
compressed_length);
_cairo_output_stream_write (surface->output, compressed, compressed_length);
_cairo_output_stream_printf (surface->output,
"\r\n"
"endstream\r\n"
"endobj\r\n");
free (compressed);
status = _cairo_pdf_surface_emit_to_unicode_stream (surface,
font_subset, TRUE,
&to_unicode_stream);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
descriptor = _cairo_pdf_surface_new_object (surface);
if (descriptor.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /FontDescriptor\r\n"
" /FontName /%s\r\n"
" /Flags 4\r\n"
" /FontBBox [ %ld %ld %ld %ld ]\r\n"
" /ItalicAngle 0\r\n"
" /Ascent %ld\r\n"
" /Descent %ld\r\n"
" /CapHeight 500\r\n"
" /StemV 80\r\n"
" /StemH 80\r\n"
" /FontFile3 %u 0 R\r\n"
">>\r\n"
"endobj\r\n",
descriptor.id,
subset->base_font,
subset->x_min,
subset->y_min,
subset->x_max,
subset->y_max,
subset->ascent,
subset->descent,
stream.id);
cidfont_dict = _cairo_pdf_surface_new_object (surface);
if (cidfont_dict.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /CIDFontType0\r\n"
" /BaseFont /%s\r\n"
" /CIDSystemInfo\r\n"
" << /Registry (Adobe)\r\n"
" /Ordering (Identity)\r\n"
" /Supplement 0\r\n"
" >>\r\n"
" /FontDescriptor %d 0 R\r\n"
" /W [0 [",
cidfont_dict.id,
subset->base_font,
descriptor.id);
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output,
" %d",
subset->widths[i]);
_cairo_output_stream_printf (surface->output,
" ]]\r\n"
">>\r\n"
"endobj\r\n");
_cairo_pdf_surface_update_object (surface, subset_resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /Type0\r\n"
" /BaseFont /%s\r\n"
" /Encoding /Identity-H\r\n"
" /DescendantFonts [ %d 0 R]\r\n",
subset_resource.id,
subset->base_font,
cidfont_dict.id);
if (to_unicode_stream.id != 0)
_cairo_output_stream_printf (surface->output,
" /ToUnicode %d 0 R\r\n",
to_unicode_stream.id);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
font.font_id = font_subset->font_id;
font.subset_id = font_subset->subset_id;
font.subset_resource = subset_resource;
status = _cairo_array_append (&surface->fonts, &font);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_cff_font_subset (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_status_t status;
cairo_cff_subset_t subset;
char name[64];
snprintf (name, sizeof name, "CairoFont-%d-%d",
font_subset->font_id, font_subset->subset_id);
status = _cairo_cff_subset_init (&subset, name, font_subset);
if (status)
return status;
status = _cairo_pdf_surface_emit_cff_font (surface, font_subset, &subset);
_cairo_cff_subset_fini (&subset);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_cff_fallback_font (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_status_t status;
cairo_cff_subset_t subset;
char name[64];
snprintf (name, sizeof name, "CairoFont-%d-%d",
font_subset->font_id, font_subset->subset_id);
status = _cairo_cff_fallback_init (&subset, name, font_subset);
if (status)
return status;
status = _cairo_pdf_surface_emit_cff_font (surface, font_subset, &subset);
_cairo_cff_fallback_fini (&subset);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset,
cairo_type1_subset_t *subset)
{
cairo_pdf_resource_t stream, descriptor, subset_resource, to_unicode_stream;
cairo_pdf_font_t font;
cairo_status_t status;
unsigned long length, compressed_length;
char *compressed;
unsigned int i;
subset_resource = _cairo_pdf_surface_get_font_resource (surface,
font_subset->font_id,
font_subset->subset_id);
if (subset_resource.id == 0)
return CAIRO_STATUS_SUCCESS;
/* We ignore the zero-trailer and set Length3 to 0. */
length = subset->header_length + subset->data_length;
compressed = compress_dup (subset->data, length, &compressed_length);
if (compressed == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
stream = _cairo_pdf_surface_new_object (surface);
if (stream.id == 0) {
free (compressed);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Filter /FlateDecode\r\n"
" /Length %lu\r\n"
" /Length1 %lu\r\n"
" /Length2 %lu\r\n"
" /Length3 0\r\n"
">>\r\n"
"stream\r\n",
stream.id,
compressed_length,
subset->header_length,
subset->data_length);
_cairo_output_stream_write (surface->output, compressed, compressed_length);
_cairo_output_stream_printf (surface->output,
"\r\n"
"endstream\r\n"
"endobj\r\n");
free (compressed);
status = _cairo_pdf_surface_emit_to_unicode_stream (surface,
font_subset, FALSE,
&to_unicode_stream);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
descriptor = _cairo_pdf_surface_new_object (surface);
if (descriptor.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /FontDescriptor\r\n"
" /FontName /%s\r\n"
" /Flags 4\r\n"
" /FontBBox [ %ld %ld %ld %ld ]\r\n"
" /ItalicAngle 0\r\n"
" /Ascent %ld\r\n"
" /Descent %ld\r\n"
" /CapHeight 500\r\n"
" /StemV 80\r\n"
" /StemH 80\r\n"
" /FontFile %u 0 R\r\n"
">>\r\n"
"endobj\r\n",
descriptor.id,
subset->base_font,
subset->x_min,
subset->y_min,
subset->x_max,
subset->y_max,
subset->ascent,
subset->descent,
stream.id);
_cairo_pdf_surface_update_object (surface, subset_resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /Type1\r\n"
" /BaseFont /%s\r\n"
" /FirstChar 0\r\n"
" /LastChar %d\r\n"
" /FontDescriptor %d 0 R\r\n"
" /Widths [",
subset_resource.id,
subset->base_font,
font_subset->num_glyphs - 1,
descriptor.id);
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output,
" %d",
subset->widths[i]);
_cairo_output_stream_printf (surface->output,
" ]\r\n");
if (to_unicode_stream.id != 0)
_cairo_output_stream_printf (surface->output,
" /ToUnicode %d 0 R\r\n",
to_unicode_stream.id);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
font.font_id = font_subset->font_id;
font.subset_id = font_subset->subset_id;
font.subset_resource = subset_resource;
return _cairo_array_append (&surface->fonts, &font);
}
#if CAIRO_HAS_FT_FONT
static cairo_status_t
_cairo_pdf_surface_emit_type1_font_subset (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_status_t status;
cairo_type1_subset_t subset;
char name[64];
snprintf (name, sizeof name, "CairoFont-%d-%d",
font_subset->font_id, font_subset->subset_id);
status = _cairo_type1_subset_init (&subset, name, font_subset, FALSE);
if (status)
return status;
status = _cairo_pdf_surface_emit_type1_font (surface, font_subset, &subset);
_cairo_type1_subset_fini (&subset);
return status;
}
#endif
static cairo_status_t
_cairo_pdf_surface_emit_type1_fallback_font (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_status_t status;
cairo_type1_subset_t subset;
char name[64];
snprintf (name, sizeof name, "CairoFont-%d-%d",
font_subset->font_id, font_subset->subset_id);
status = _cairo_type1_fallback_init_binary (&subset, name, font_subset);
if (status)
return status;
status = _cairo_pdf_surface_emit_type1_font (surface, font_subset, &subset);
_cairo_type1_fallback_fini (&subset);
return status;
}
#define PDF_UNITS_PER_EM 1000
static cairo_status_t
_cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_pdf_resource_t stream, descriptor, cidfont_dict;
cairo_pdf_resource_t subset_resource, to_unicode_stream;
cairo_status_t status;
cairo_pdf_font_t font;
cairo_truetype_subset_t subset;
unsigned long compressed_length;
char *compressed;
unsigned int i;
subset_resource = _cairo_pdf_surface_get_font_resource (surface,
font_subset->font_id,
font_subset->subset_id);
if (subset_resource.id == 0)
return CAIRO_STATUS_SUCCESS;
status = _cairo_truetype_subset_init (&subset, font_subset);
if (status)
return status;
compressed = compress_dup (subset.data, subset.data_length,
&compressed_length);
if (compressed == NULL) {
_cairo_truetype_subset_fini (&subset);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
stream = _cairo_pdf_surface_new_object (surface);
if (stream.id == 0) {
free (compressed);
_cairo_truetype_subset_fini (&subset);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Filter /FlateDecode\r\n"
" /Length %lu\r\n"
" /Length1 %lu\r\n"
">>\r\n"
"stream\r\n",
stream.id,
compressed_length,
subset.data_length);
_cairo_output_stream_write (surface->output, compressed, compressed_length);
_cairo_output_stream_printf (surface->output,
"\r\n"
"endstream\r\n"
"endobj\r\n");
free (compressed);
status = _cairo_pdf_surface_emit_to_unicode_stream (surface,
font_subset, TRUE,
&to_unicode_stream);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED) {
_cairo_truetype_subset_fini (&subset);
return status;
}
descriptor = _cairo_pdf_surface_new_object (surface);
if (descriptor.id == 0) {
_cairo_truetype_subset_fini (&subset);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /FontDescriptor\r\n"
" /FontName /%s\r\n"
" /Flags 4\r\n"
" /FontBBox [ %ld %ld %ld %ld ]\r\n"
" /ItalicAngle 0\r\n"
" /Ascent %ld\r\n"
" /Descent %ld\r\n"
" /CapHeight %ld\r\n"
" /StemV 80\r\n"
" /StemH 80\r\n"
" /FontFile2 %u 0 R\r\n"
">>\r\n"
"endobj\r\n",
descriptor.id,
subset.base_font,
(long)(subset.x_min*PDF_UNITS_PER_EM),
(long)(subset.y_min*PDF_UNITS_PER_EM),
(long)(subset.x_max*PDF_UNITS_PER_EM),
(long)(subset.y_max*PDF_UNITS_PER_EM),
(long)(subset.ascent*PDF_UNITS_PER_EM),
(long)(subset.descent*PDF_UNITS_PER_EM),
(long)(subset.y_max*PDF_UNITS_PER_EM),
stream.id);
cidfont_dict = _cairo_pdf_surface_new_object (surface);
if (cidfont_dict.id == 0) {
_cairo_truetype_subset_fini (&subset);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /CIDFontType2\r\n"
" /BaseFont /%s\r\n"
" /CIDSystemInfo\r\n"
" << /Registry (Adobe)\r\n"
" /Ordering (Identity)\r\n"
" /Supplement 0\r\n"
" >>\r\n"
" /FontDescriptor %d 0 R\r\n"
" /W [0 [",
cidfont_dict.id,
subset.base_font,
descriptor.id);
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output,
" %ld",
(long)(subset.widths[i]*PDF_UNITS_PER_EM));
_cairo_output_stream_printf (surface->output,
" ]]\r\n"
">>\r\n"
"endobj\r\n");
_cairo_pdf_surface_update_object (surface, subset_resource);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /Type0\r\n"
" /BaseFont /%s\r\n"
" /Encoding /Identity-H\r\n"
" /DescendantFonts [ %d 0 R]\r\n",
subset_resource.id,
subset.base_font,
cidfont_dict.id);
if (to_unicode_stream.id != 0)
_cairo_output_stream_printf (surface->output,
" /ToUnicode %d 0 R\r\n",
to_unicode_stream.id);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
font.font_id = font_subset->font_id;
font.subset_id = font_subset->subset_id;
font.subset_resource = subset_resource;
status = _cairo_array_append (&surface->fonts, &font);
_cairo_truetype_subset_fini (&subset);
return status;
}
static cairo_int_status_t
_cairo_pdf_surface_emit_bitmap_glyph (cairo_pdf_surface_t *surface,
cairo_scaled_font_t *scaled_font,
unsigned long glyph_index,
cairo_pdf_resource_t *glyph_ret,
cairo_box_t *bbox,
double *width)
{
cairo_scaled_glyph_t *scaled_glyph;
cairo_status_t status;
cairo_image_surface_t *image;
unsigned char *row, *byte;
int rows, cols;
double x_advance, y_advance;
status = _cairo_scaled_glyph_lookup (scaled_font,
glyph_index,
CAIRO_SCALED_GLYPH_INFO_METRICS|
CAIRO_SCALED_GLYPH_INFO_SURFACE,
&scaled_glyph);
if (status)
return status;
x_advance = scaled_glyph->metrics.x_advance;
y_advance = scaled_glyph->metrics.y_advance;
cairo_matrix_transform_distance (&scaled_font->ctm, &x_advance, &y_advance);
*bbox = scaled_glyph->bbox;
*width = x_advance;
image = scaled_glyph->surface;
if (image->format != CAIRO_FORMAT_A1) {
image = _cairo_image_surface_clone (image, CAIRO_FORMAT_A1);
status = cairo_surface_status (&image->base);
if (status)
return status;
}
status = _cairo_pdf_surface_open_stream (surface,
NULL,
surface->compress_content,
NULL);
if (status) {
if (image != scaled_glyph->surface)
cairo_surface_destroy (&image->base);
return status;
}
*glyph_ret = surface->pdf_stream.self;
_cairo_output_stream_printf (surface->output,
"%f 0 %f %f %f %f d1\r\n",
x_advance,
_cairo_fixed_to_double (scaled_glyph->bbox.p1.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p2.y),
_cairo_fixed_to_double (scaled_glyph->bbox.p2.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p1.y));
_cairo_output_stream_printf (surface->output,
"%f 0 0 %f %f %f cm\r\n",
_cairo_fixed_to_double (scaled_glyph->bbox.p2.x) - _cairo_fixed_to_double (scaled_glyph->bbox.p1.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p1.y) - _cairo_fixed_to_double (scaled_glyph->bbox.p2.y),
_cairo_fixed_to_double (scaled_glyph->bbox.p1.x),
_cairo_fixed_to_double (scaled_glyph->bbox.p2.y));
_cairo_output_stream_printf (surface->output,
"BI\r\n"
"/IM true\r\n"
"/W %d\r\n"
"/H %d\r\n"
"/BPC 1\r\n"
"/D [1 0]\r\n",
image->width,
image->height);
_cairo_output_stream_printf (surface->output,
"ID ");
for (row = image->data, rows = image->height; rows; row += image->stride, rows--) {
for (byte = row, cols = (image->width + 7) / 8; cols; byte++, cols--) {
unsigned char output_byte = CAIRO_BITSWAP8_IF_LITTLE_ENDIAN (*byte);
_cairo_output_stream_write (surface->output, &output_byte, 1);
}
}
_cairo_output_stream_printf (surface->output,
"\r\nEI\r\n");
status = _cairo_pdf_surface_close_stream (surface);
if (image != scaled_glyph->surface)
cairo_surface_destroy (&image->base);
return status;
}
static cairo_status_t
_cairo_pdf_surface_emit_type3_font_subset (cairo_pdf_surface_t *surface,
cairo_scaled_font_subset_t *font_subset)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_pdf_resource_t *glyphs, encoding, char_procs, subset_resource, to_unicode_stream;
cairo_pdf_font_t font;
cairo_matrix_t matrix;
double *widths;
unsigned int i;
cairo_box_t font_bbox = {{0,0},{0,0}};
cairo_box_t bbox = {{0,0},{0,0}};
if (font_subset->num_glyphs == 0)
return CAIRO_STATUS_SUCCESS;
subset_resource = _cairo_pdf_surface_get_font_resource (surface,
font_subset->font_id,
font_subset->subset_id);
if (subset_resource.id == 0)
return CAIRO_STATUS_SUCCESS;
glyphs = _cairo_malloc_ab (font_subset->num_glyphs, sizeof (cairo_pdf_resource_t));
if (glyphs == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
widths = _cairo_malloc_ab (font_subset->num_glyphs, sizeof (double));
if (widths == NULL) {
free (glyphs);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
for (i = 0; i < font_subset->num_glyphs; i++) {
status = _cairo_pdf_surface_emit_bitmap_glyph (surface,
font_subset->scaled_font,
font_subset->glyphs[i],
&glyphs[i],
&bbox,
&widths[i]);
if (status)
break;
if (i == 0) {
font_bbox.p1.x = bbox.p1.x;
font_bbox.p1.y = bbox.p1.y;
font_bbox.p2.x = bbox.p2.x;
font_bbox.p2.y = bbox.p2.y;
} else {
if (bbox.p1.x < font_bbox.p1.x)
font_bbox.p1.x = bbox.p1.x;
if (bbox.p1.y < font_bbox.p1.y)
font_bbox.p1.y = bbox.p1.y;
if (bbox.p2.x > font_bbox.p2.x)
font_bbox.p2.x = bbox.p2.x;
if (bbox.p2.y > font_bbox.p2.y)
font_bbox.p2.y = bbox.p2.y;
}
}
if (status) {
free (glyphs);
free (widths);
return status;
}
encoding = _cairo_pdf_surface_new_object (surface);
if (encoding.id == 0) {
free (glyphs);
free (widths);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Encoding\r\n"
" /Differences [0", encoding.id);
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output,
" /%d", i);
_cairo_output_stream_printf (surface->output,
"]\r\n"
">>\r\n"
"endobj\r\n");
char_procs = _cairo_pdf_surface_new_object (surface);
if (char_procs.id == 0) {
free (glyphs);
free (widths);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<<\r\n", char_procs.id);
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output,
" /%d %d 0 R\r\n",
i, glyphs[i].id);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
free (glyphs);
status = _cairo_pdf_surface_emit_to_unicode_stream (surface,
font_subset, FALSE,
&to_unicode_stream);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED) {
free (widths);
return status;
}
_cairo_pdf_surface_update_object (surface, subset_resource);
matrix = font_subset->scaled_font->scale;
status = cairo_matrix_invert (&matrix);
/* _cairo_scaled_font_init ensures the matrix is invertible */
assert (status == CAIRO_STATUS_SUCCESS);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /Type3\r\n"
" /FontBBox [%f %f %f %f]\r\n"
" /FontMatrix [ %f %f %f %f 0 0 ]\r\n"
" /Encoding %d 0 R\r\n"
" /CharProcs %d 0 R\r\n"
" /FirstChar 0\r\n"
" /LastChar %d\r\n",
subset_resource.id,
_cairo_fixed_to_double (font_bbox.p1.x),
_cairo_fixed_to_double (font_bbox.p1.y),
_cairo_fixed_to_double (font_bbox.p2.x),
_cairo_fixed_to_double (font_bbox.p2.y),
matrix.xx,
matrix.yx,
-matrix.xy,
-matrix.yy,
encoding.id,
char_procs.id,
font_subset->num_glyphs - 1);
_cairo_output_stream_printf (surface->output,
" /Widths [");
for (i = 0; i < font_subset->num_glyphs; i++)
_cairo_output_stream_printf (surface->output, " %f", widths[i]);
_cairo_output_stream_printf (surface->output,
"]\r\n");
free (widths);
if (to_unicode_stream.id != 0)
_cairo_output_stream_printf (surface->output,
" /ToUnicode %d 0 R\r\n",
to_unicode_stream.id);
_cairo_output_stream_printf (surface->output,
">>\r\n"
"endobj\r\n");
font.font_id = font_subset->font_id;
font.subset_id = font_subset->subset_id;
font.subset_resource = subset_resource;
return _cairo_array_append (&surface->fonts, &font);
}
static cairo_status_t
_cairo_pdf_surface_emit_unscaled_font_subset (cairo_scaled_font_subset_t *font_subset,
void *closure)
{
cairo_pdf_surface_t *surface = closure;
cairo_status_t status;
if (font_subset->is_composite) {
status = _cairo_pdf_surface_emit_cff_font_subset (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
status = _cairo_pdf_surface_emit_truetype_font_subset (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
status = _cairo_pdf_surface_emit_cff_fallback_font (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
} else {
#if CAIRO_HAS_FT_FONT
status = _cairo_pdf_surface_emit_type1_font_subset (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
#endif
status = _cairo_pdf_surface_emit_type1_fallback_font (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_emit_scaled_font_subset (cairo_scaled_font_subset_t *font_subset,
void *closure)
{
cairo_pdf_surface_t *surface = closure;
cairo_status_t status;
status = _cairo_pdf_surface_emit_type3_font_subset (surface, font_subset);
if (status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_emit_font_subsets (cairo_pdf_surface_t *surface)
{
cairo_status_t status;
status = _cairo_scaled_font_subsets_foreach_unscaled (surface->font_subsets,
_cairo_pdf_surface_emit_unscaled_font_subset,
surface);
if (status)
goto BAIL;
status = _cairo_scaled_font_subsets_foreach_scaled (surface->font_subsets,
_cairo_pdf_surface_emit_scaled_font_subset,
surface);
BAIL:
_cairo_scaled_font_subsets_destroy (surface->font_subsets);
surface->font_subsets = NULL;
return status;
}
static cairo_pdf_resource_t
_cairo_pdf_surface_write_catalog (cairo_pdf_surface_t *surface)
{
cairo_pdf_resource_t catalog;
catalog = _cairo_pdf_surface_new_object (surface);
if (catalog.id == 0)
return catalog;
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Catalog\r\n"
" /Pages %d 0 R\r\n"
">>\r\n"
"endobj\r\n",
catalog.id,
surface->pages_resource.id);
return catalog;
}
static long
_cairo_pdf_surface_write_xref (cairo_pdf_surface_t *surface)
{
cairo_pdf_object_t *object;
int num_objects, i;
long offset;
char buffer[11];
num_objects = _cairo_array_num_elements (&surface->objects);
offset = _cairo_output_stream_get_position (surface->output);
_cairo_output_stream_printf (surface->output,
"xref\r\n"
"%d %d\r\n",
0, num_objects + 1);
_cairo_output_stream_printf (surface->output,
"0000000000 65535 f\r\n");
for (i = 0; i < num_objects; i++) {
object = _cairo_array_index (&surface->objects, i);
snprintf (buffer, sizeof buffer, "%010ld", object->offset);
_cairo_output_stream_printf (surface->output,
"%s 00000 n\r\n", buffer);
}
return offset;
}
static cairo_status_t
_cairo_pdf_surface_write_mask_group (cairo_pdf_surface_t *surface,
cairo_pdf_smask_group_t *group)
{
cairo_pdf_resource_t mask_group;
cairo_pdf_resource_t smask;
cairo_pdf_smask_group_t *smask_group;
cairo_pdf_resource_t pattern_res, gstate_res;
cairo_status_t status;
/* Create mask group */
status = _cairo_pdf_surface_open_group (surface, NULL);
if (status)
return status;
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, group->mask, &pattern_res, &gstate_res);
if (status)
return status;
if (gstate_res.id != 0) {
smask_group = _cairo_pdf_surface_create_smask_group (surface);
if (smask_group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
smask_group->operation = PDF_PAINT;
smask_group->source = cairo_pattern_reference (group->mask);
smask_group->source_res = pattern_res;
status = _cairo_pdf_surface_add_smask_group (surface, smask_group);
if (status) {
_cairo_pdf_smask_group_destroy (smask_group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, smask_group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
smask_group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, group->mask, pattern_res, FALSE);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"0 0 %f %f re f\r\n",
surface->width, surface->height);
_cairo_pdf_surface_unselect_pattern (surface);
}
status = _cairo_pdf_surface_close_group (surface, &mask_group);
if (status)
return status;
/* Create source group */
status = _cairo_pdf_surface_open_group (surface, &group->source_res);
if (status)
return status;
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, group->source, &pattern_res, &gstate_res);
if (status)
return status;
if (gstate_res.id != 0) {
smask_group = _cairo_pdf_surface_create_smask_group (surface);
if (smask_group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
smask_group->operation = PDF_PAINT;
smask_group->source = cairo_pattern_reference (group->source);
smask_group->source_res = pattern_res;
status = _cairo_pdf_surface_add_smask_group (surface, smask_group);
if (status) {
_cairo_pdf_smask_group_destroy (smask_group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, smask_group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
smask_group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, group->source, pattern_res, FALSE);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"0 0 %f %f re f\r\n",
surface->width, surface->height);
_cairo_pdf_surface_unselect_pattern (surface);
}
status = _cairo_pdf_surface_close_group (surface, NULL);
if (status)
return status;
/* Create an smask based on the alpha component of mask_group */
smask = _cairo_pdf_surface_new_object (surface);
if (smask.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Mask\r\n"
" /S /Alpha\r\n"
" /G %d 0 R\r\n"
">>\r\n"
"endobj\r\n",
smask.id,
mask_group.id);
/* Create a GState that uses the smask */
_cairo_pdf_surface_update_object (surface, group->group_res);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /ExtGState\r\n"
" /SMask %d 0 R\r\n"
" /ca 1\r\n"
" /CA 1\r\n"
" /AIS false\r\n"
">>\r\n"
"endobj\r\n",
group->group_res.id,
smask.id);
return _cairo_output_stream_get_status (surface->output);
}
static cairo_status_t
_cairo_pdf_surface_write_smask_group (cairo_pdf_surface_t *surface,
cairo_pdf_smask_group_t *group)
{
cairo_status_t status;
/* _mask is a special case that requires two groups - source
* and mask as well as a smask and gstate dictionary */
if (group->operation == PDF_MASK)
return _cairo_pdf_surface_write_mask_group (surface, group);
status = _cairo_pdf_surface_open_group (surface, &group->group_res);
if (status)
return status;
status = _cairo_pdf_surface_select_pattern (surface,
group->source,
group->source_res,
group->operation == PDF_STROKE);
if (status)
return status;
switch (group->operation) {
case PDF_PAINT:
_cairo_output_stream_printf (surface->output,
"0 0 %f %f re f\r\n",
surface->width, surface->height);
break;
case PDF_MASK:
ASSERT_NOT_REACHED;
break;
case PDF_FILL:
status = _cairo_pdf_operators_fill (&surface->pdf_operators,
&group->path,
group->fill_rule);
break;
case PDF_STROKE:
status = _cairo_pdf_operator_stroke (&surface->pdf_operators,
&group->path,
group->style,
&group->ctm,
&group->ctm_inverse);
break;
case PDF_SHOW_GLYPHS:
status = _cairo_pdf_operators_show_glyphs (&surface->pdf_operators,
group->glyphs,
group->num_glyphs,
group->scaled_font);
break;
}
if (status)
return status;
_cairo_pdf_surface_unselect_pattern (surface);
return _cairo_pdf_surface_close_group (surface, NULL);
}
static cairo_status_t
_cairo_pdf_surface_write_patterns_and_smask_groups (cairo_pdf_surface_t *surface)
{
cairo_pdf_pattern_t pattern;
cairo_pdf_smask_group_t *group;
int pattern_index, group_index;
cairo_status_t status;
/* Writing out PDF_MASK groups will cause additional smask groups
* to be appended to surface->smask_groups. Additional patterns
* may also be appended to surface->patterns.
*
* Writing meta surface patterns will cause additional patterns
* and groups to be appended.
*/
pattern_index = 0;
group_index = 0;
while ((pattern_index < _cairo_array_num_elements (&surface->patterns)) ||
(group_index < _cairo_array_num_elements (&surface->smask_groups)))
{
for (; group_index < _cairo_array_num_elements (&surface->smask_groups); group_index++) {
_cairo_array_copy_element (&surface->smask_groups, group_index, &group);
status = _cairo_pdf_surface_write_smask_group (surface, group);
if (status)
return status;
}
for (; pattern_index < _cairo_array_num_elements (&surface->patterns); pattern_index++) {
_cairo_array_copy_element (&surface->patterns, pattern_index, &pattern);
status = _cairo_pdf_surface_emit_pattern (surface, &pattern);
if (status)
return status;
}
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_surface_write_page (cairo_pdf_surface_t *surface)
{
cairo_pdf_resource_t page, knockout, res;
cairo_status_t status;
int i, len;
_cairo_pdf_group_resources_clear (&surface->resources);
if (surface->has_fallback_images) {
status = _cairo_pdf_surface_open_knockout_group (surface);
if (status)
return status;
len = _cairo_array_num_elements (&surface->knockout_group);
for (i = 0; i < len; i++) {
_cairo_array_copy_element (&surface->knockout_group, i, &res);
_cairo_output_stream_printf (surface->output,
"/x%d Do\r\n",
res.id);
status = _cairo_pdf_surface_add_xobject (surface, res);
if (status)
return status;
}
_cairo_output_stream_printf (surface->output,
"/x%d Do\r\n",
surface->content.id);
status = _cairo_pdf_surface_add_xobject (surface, surface->content);
if (status)
return status;
status = _cairo_pdf_surface_close_group (surface, &knockout);
if (status)
return status;
_cairo_pdf_group_resources_clear (&surface->resources);
status = _cairo_pdf_surface_open_content_stream (surface, FALSE);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"/x%d Do\r\n",
knockout.id);
status = _cairo_pdf_surface_add_xobject (surface, knockout);
if (status)
return status;
status = _cairo_pdf_surface_close_content_stream (surface);
if (status)
return status;
}
page = _cairo_pdf_surface_new_object (surface);
if (page.id == 0)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Type /Page\r\n"
" /Parent %d 0 R\r\n"
" /MediaBox [ 0 0 %f %f ]\r\n"
" /Contents %d 0 R\r\n"
" /Group <<\r\n"
" /Type /Group\r\n"
" /S /Transparency\r\n"
" /CS /DeviceRGB\r\n"
" >>\r\n"
" /Resources %d 0 R\r\n"
">>\r\n"
"endobj\r\n",
page.id,
surface->pages_resource.id,
surface->width,
surface->height,
surface->content.id,
surface->content_resources.id);
status = _cairo_array_append (&surface->pages, &page);
if (status)
return status;
status = _cairo_pdf_surface_write_patterns_and_smask_groups (surface);
if (status)
return status;
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
_surface_pattern_supported (cairo_surface_pattern_t *pattern)
{
cairo_extend_t extend;
if (_cairo_surface_is_meta (pattern->surface))
return TRUE;
if (pattern->surface->backend->acquire_source_image == NULL)
return FALSE;
/* Does an ALPHA-only source surface even make sense? Maybe, but I
* don't think it's worth the extra code to support it. */
/* XXX: Need to write this function here...
content = cairo_surface_get_content (pattern->surface);
if (content == CAIRO_CONTENT_ALPHA)
return FALSE;
*/
extend = cairo_pattern_get_extend (&pattern->base);
switch (extend) {
case CAIRO_EXTEND_NONE:
case CAIRO_EXTEND_REPEAT:
case CAIRO_EXTEND_REFLECT:
/* There's no point returning FALSE for EXTEND_PAD, as the image
* surface does not currently implement it either */
case CAIRO_EXTEND_PAD:
return TRUE;
}
ASSERT_NOT_REACHED;
return FALSE;
}
static cairo_bool_t
_gradient_pattern_supported (cairo_pattern_t *pattern)
{
cairo_extend_t extend;
extend = cairo_pattern_get_extend (pattern);
/* Radial gradients are currently only supported with EXTEND_NONE
* and EXTEND_PAD and when one circle is inside the other. */
if (pattern->type == CAIRO_PATTERN_TYPE_RADIAL) {
double x1, y1, x2, y2, r1, r2, d;
cairo_radial_pattern_t *radial = (cairo_radial_pattern_t *) pattern;
if (extend == CAIRO_EXTEND_REPEAT ||
extend == CAIRO_EXTEND_REFLECT) {
return FALSE;
}
x1 = _cairo_fixed_to_double (radial->c1.x);
y1 = _cairo_fixed_to_double (radial->c1.y);
r1 = _cairo_fixed_to_double (radial->r1);
x2 = _cairo_fixed_to_double (radial->c2.x);
y2 = _cairo_fixed_to_double (radial->c2.y);
r2 = _cairo_fixed_to_double (radial->r2);
d = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1));
if (d > fabs(r2 - r1)) {
return FALSE;
}
}
return TRUE;
}
static cairo_bool_t
_pattern_supported (cairo_pattern_t *pattern)
{
if (pattern->type == CAIRO_PATTERN_TYPE_SOLID)
return TRUE;
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
pattern->type == CAIRO_PATTERN_TYPE_RADIAL)
return _gradient_pattern_supported (pattern);
if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE)
return _surface_pattern_supported ((cairo_surface_pattern_t *) pattern);
return FALSE;
}
static cairo_int_status_t
_cairo_pdf_surface_analyze_operation (cairo_pdf_surface_t *surface,
cairo_operator_t op,
cairo_pattern_t *pattern)
{
if (surface->force_fallbacks && surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _pattern_supported (pattern))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (op == CAIRO_OPERATOR_OVER || op == CAIRO_OPERATOR_SOURCE) {
if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_pattern_t *surface_pattern = (cairo_surface_pattern_t *) pattern;
if ( _cairo_surface_is_meta (surface_pattern->surface))
return CAIRO_INT_STATUS_ANALYZE_META_SURFACE_PATTERN;
}
}
if (op == CAIRO_OPERATOR_OVER)
return CAIRO_STATUS_SUCCESS;
/* The SOURCE operator is only if there is nothing painted
* underneath. */
if (op == CAIRO_OPERATOR_SOURCE)
return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_bool_t
_cairo_pdf_surface_operation_supported (cairo_pdf_surface_t *surface,
cairo_operator_t op,
cairo_pattern_t *pattern)
{
if (_cairo_pdf_surface_analyze_operation (surface, op, pattern) != CAIRO_INT_STATUS_UNSUPPORTED)
return TRUE;
else
return FALSE;
}
static cairo_int_status_t
_cairo_pdf_surface_start_fallback (cairo_pdf_surface_t *surface)
{
cairo_status_t status;
status = _cairo_pdf_surface_close_content_stream (surface);
if (status)
return status;
status = _cairo_array_append (&surface->knockout_group, &surface->content);
if (status)
return status;
surface->has_fallback_images = TRUE;
_cairo_pdf_group_resources_clear (&surface->resources);
return _cairo_pdf_surface_open_content_stream (surface, TRUE);
}
static cairo_int_status_t
_cairo_pdf_surface_paint (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_pdf_smask_group_t *group;
cairo_pdf_resource_t pattern_res, gstate_res;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) {
return _cairo_pdf_surface_analyze_operation (surface, op, source);
} else if (surface->paginated_mode == CAIRO_PAGINATED_MODE_FALLBACK) {
status = _cairo_pdf_surface_start_fallback (surface);
if (status)
return status;
}
assert (_cairo_pdf_surface_operation_supported (surface, op, source));
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, source, &pattern_res, &gstate_res);
if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
if (status)
return status;
if (gstate_res.id != 0) {
group = _cairo_pdf_surface_create_smask_group (surface);
if (group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
group->operation = PDF_PAINT;
group->source = cairo_pattern_reference (source);
group->source_res = pattern_res;
status = _cairo_pdf_surface_add_smask_group (surface, group);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, source, pattern_res, FALSE);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"0 0 %f %f re f\r\n",
surface->width, surface->height);
_cairo_pdf_surface_unselect_pattern (surface);
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_int_status_t
_cairo_pdf_surface_mask (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
cairo_pattern_t *mask)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_pdf_smask_group_t *group;
cairo_status_t status, status2;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) {
status = _cairo_pdf_surface_analyze_operation (surface, op, source);
if (status != CAIRO_STATUS_SUCCESS &&
status != CAIRO_INT_STATUS_ANALYZE_META_SURFACE_PATTERN)
return status;
status2 = _cairo_pdf_surface_analyze_operation (surface, op, mask);
if (status2 != CAIRO_STATUS_SUCCESS)
return status2;
return status;
} else if (surface->paginated_mode == CAIRO_PAGINATED_MODE_FALLBACK) {
status = _cairo_pdf_surface_start_fallback (surface);
if (status)
return status;
}
assert (_cairo_pdf_surface_operation_supported (surface, op, source));
assert (_cairo_pdf_surface_operation_supported (surface, op, mask));
group = _cairo_pdf_surface_create_smask_group (surface);
if (group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
group->operation = PDF_MASK;
group->source = cairo_pattern_reference (source);
group->mask = cairo_pattern_reference (mask);
group->source_res = _cairo_pdf_surface_new_object (surface);
if (group->source_res.id == 0) {
_cairo_pdf_smask_group_destroy (group);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
status = _cairo_pdf_surface_add_smask_group (surface, group);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, group->group_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, group->source_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
group->group_res.id,
group->source_res.id);
return _cairo_output_stream_get_status (surface->output);
}
static cairo_int_status_t
_cairo_pdf_surface_stroke (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
cairo_path_fixed_t *path,
cairo_stroke_style_t *style,
cairo_matrix_t *ctm,
cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_antialias_t antialias)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_pdf_smask_group_t *group;
cairo_pdf_resource_t pattern_res, gstate_res;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return _cairo_pdf_surface_analyze_operation (surface, op, source);
assert (_cairo_pdf_surface_operation_supported (surface, op, source));
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, source, &pattern_res, &gstate_res);
if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
if (status)
return status;
if (gstate_res.id != 0) {
group = _cairo_pdf_surface_create_smask_group (surface);
if (group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
group->operation = PDF_STROKE;
group->source = cairo_pattern_reference (source);
group->source_res = pattern_res;
status = _cairo_path_fixed_init_copy (&group->path, path);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
group->style = style;
group->ctm = *ctm;
group->ctm_inverse = *ctm_inverse;
status = _cairo_pdf_surface_add_smask_group (surface, group);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, source, pattern_res, TRUE);
if (status)
return status;
status = _cairo_pdf_operator_stroke (&surface->pdf_operators,
path,
style,
ctm,
ctm_inverse);
if (status)
return status;
_cairo_pdf_surface_unselect_pattern (surface);
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_int_status_t
_cairo_pdf_surface_fill (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_pdf_smask_group_t *group;
cairo_pdf_resource_t pattern_res, gstate_res;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) {
return _cairo_pdf_surface_analyze_operation (surface, op, source);
} else if (surface->paginated_mode == CAIRO_PAGINATED_MODE_FALLBACK) {
status = _cairo_pdf_surface_start_fallback (surface);
if (status)
return status;
}
assert (_cairo_pdf_surface_operation_supported (surface, op, source));
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, source, &pattern_res, &gstate_res);
if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
if (status)
return status;
if (gstate_res.id != 0) {
group = _cairo_pdf_surface_create_smask_group (surface);
if (group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
group->operation = PDF_FILL;
group->source = cairo_pattern_reference (source);
group->source_res = pattern_res;
status = _cairo_path_fixed_init_copy (&group->path, path);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
group->fill_rule = fill_rule;
status = _cairo_pdf_surface_add_smask_group (surface, group);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, source, pattern_res, FALSE);
if (status)
return status;
status = _cairo_pdf_operators_fill (&surface->pdf_operators,
path,
fill_rule);
if (status)
return status;
_cairo_pdf_surface_unselect_pattern (surface);
}
return _cairo_output_stream_get_status (surface->output);
}
static cairo_int_status_t
_cairo_pdf_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_pdf_smask_group_t *group;
cairo_pdf_resource_t pattern_res, gstate_res;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return _cairo_pdf_surface_analyze_operation (surface, op, source);
assert (_cairo_pdf_surface_operation_supported (surface, op, source));
pattern_res.id = 0;
gstate_res.id = 0;
status = _cairo_pdf_surface_add_pdf_pattern (surface, source, &pattern_res, &gstate_res);
if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
if (status)
return status;
if (gstate_res.id != 0) {
group = _cairo_pdf_surface_create_smask_group (surface);
if (group == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
group->operation = PDF_SHOW_GLYPHS;
group->source = cairo_pattern_reference (source);
group->source_res = pattern_res;
group->glyphs = glyphs;
group->num_glyphs = num_glyphs;
group->scaled_font = cairo_scaled_font_reference (scaled_font);
status = _cairo_pdf_surface_add_smask_group (surface, group);
if (status) {
_cairo_pdf_smask_group_destroy (group);
return status;
}
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (status)
return status;
status = _cairo_pdf_surface_add_xobject (surface, group->group_res);
if (status)
return status;
_cairo_output_stream_printf (surface->output,
"q /s%d gs /x%d Do Q\r\n",
gstate_res.id,
group->group_res.id);
} else {
status = _cairo_pdf_surface_select_pattern (surface, source, pattern_res, FALSE);
if (status)
return status;
status = _cairo_pdf_operators_show_glyphs (&surface->pdf_operators,
glyphs,
num_glyphs,
scaled_font);
if (status)
return status;
_cairo_pdf_surface_unselect_pattern (surface);
}
return _cairo_output_stream_get_status (surface->output);
}
static void
_cairo_pdf_surface_set_paginated_mode (void *abstract_surface,
cairo_paginated_mode_t paginated_mode)
{
cairo_pdf_surface_t *surface = abstract_surface;
surface->paginated_mode = paginated_mode;
}
static const cairo_surface_backend_t cairo_pdf_surface_backend = {
CAIRO_SURFACE_TYPE_PDF,
_cairo_pdf_surface_create_similar,
_cairo_pdf_surface_finish,
NULL, /* acquire_source_image */
NULL, /* release_source_image */
NULL, /* acquire_dest_image */
NULL, /* release_dest_image */
NULL, /* clone_similar */
NULL, /* composite */
NULL, /* fill_rectangles */
NULL, /* composite_trapezoids */
NULL, /* _cairo_pdf_surface_copy_page */
_cairo_pdf_surface_show_page,
NULL, /* set_clip_region */
_cairo_pdf_surface_intersect_clip_path,
_cairo_pdf_surface_get_extents,
NULL, /* old_show_glyphs */
_cairo_pdf_surface_get_font_options,
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
NULL, /* scaled_font_fini */
NULL, /* scaled_glyph_fini */
/* Here are the drawing functions */
_cairo_pdf_surface_paint,
_cairo_pdf_surface_mask,
_cairo_pdf_surface_stroke,
_cairo_pdf_surface_fill,
_cairo_pdf_surface_show_glyphs,
NULL, /* snapshot */
NULL, /* is_compatible */
NULL, /* reset */
};
static const cairo_paginated_surface_backend_t cairo_pdf_surface_paginated_backend = {
_cairo_pdf_surface_start_page,
_cairo_pdf_surface_set_paginated_mode
};
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