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cairo/src/cairo-pdf-surface.c
Emmanuel Pacaud a732058920 Implement paginated create_similar, moving similar images down to PS and PDF. 
The new paginated create_similar simply forwards to target backend create_similar.

We maintain the fact that PS and PDF surfaces are returning image
surfaces for create_similar by moving that explicitly to their own
create_similar functions.

(This commit is the combination of the following original commits:

	6b69e8c012adb4f2fc2ee9c1579fed8214e8f510
	2589db92a4395f8e900dbc4eafc45982f0d985d3
)
2006-04-27 06:36:16 -07:00

2314 lines
66 KiB
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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc
* Copyright © 2006 Red Hat, Inc
*
* 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>
*/
#include "cairoint.h"
#include "cairo-pdf.h"
#include "cairo-font-subset-private.h"
#include "cairo-ft-private.h"
#include "cairo-paginated-surface-private.h"
#include "cairo-path-fixed-private.h"
#include <time.h>
#include <zlib.h>
/* Issues:
*
* - Why doesn't pages inherit /alpha%d GS dictionaries from the Pages
* object?
*
* - 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.
*
* - Clipping: must be able to reset clipping
*
* - Images of other formats than 8 bit RGBA.
*
* - Backend specific meta data.
*
* - Surface patterns.
*
* - Alpha channels in gradients.
*
* - 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 similiar surface and does show_page and then
* does show_surface on another surface?
*
* - Output TM so page scales to the right size - PDF default user
* space has 1 unit = 1 / 72 inch.
*
* - Add test case for RGBA images.
*
* - Add test case for RGBA gradients.
*
* - Coordinate space for create_similar() args?
*
* - Investigate /Matrix entry in content stream dicts for pages
* instead of outputting the cm operator in every page.
*/
typedef struct cairo_pdf_object cairo_pdf_object_t;
typedef struct cairo_pdf_resource cairo_pdf_resource_t;
typedef struct cairo_pdf_stream cairo_pdf_stream_t;
typedef struct cairo_pdf_document cairo_pdf_document_t;
typedef struct cairo_pdf_surface cairo_pdf_surface_t;
struct cairo_pdf_object {
long offset;
};
struct cairo_pdf_resource {
unsigned int id;
};
struct cairo_pdf_stream {
unsigned int id;
unsigned int length_id;
long start_offset;
};
struct cairo_pdf_document {
cairo_output_stream_t *output_stream;
unsigned long ref_count;
cairo_surface_t *owner;
cairo_bool_t finished;
double width;
double height;
double x_dpi;
double y_dpi;
unsigned int next_available_id;
unsigned int pages_id;
cairo_pdf_stream_t *current_stream;
cairo_array_t objects;
cairo_array_t pages;
cairo_array_t fonts;
};
struct cairo_pdf_surface {
cairo_surface_t base;
double width;
double height;
cairo_pdf_document_t *document;
cairo_pdf_stream_t *current_stream;
cairo_array_t patterns;
cairo_array_t xobjects;
cairo_array_t streams;
cairo_array_t alphas;
cairo_array_t fonts;
cairo_bool_t has_clip;
cairo_paginated_mode_t paginated_mode;
};
#define DEFAULT_DPI 300
static cairo_pdf_document_t *
_cairo_pdf_document_create (cairo_output_stream_t *stream,
double width,
double height);
static void
_cairo_pdf_document_destroy (cairo_pdf_document_t *document);
static cairo_status_t
_cairo_pdf_document_finish (cairo_pdf_document_t *document);
static cairo_pdf_document_t *
_cairo_pdf_document_reference (cairo_pdf_document_t *document);
static unsigned int
_cairo_pdf_document_new_object (cairo_pdf_document_t *document);
static cairo_status_t
_cairo_pdf_document_add_page (cairo_pdf_document_t *document,
cairo_pdf_surface_t *surface);
static void
_cairo_pdf_surface_clear (cairo_pdf_surface_t *surface);
static cairo_pdf_stream_t *
_cairo_pdf_document_open_stream (cairo_pdf_document_t *document,
const char *fmt,
...) CAIRO_PRINTF_FORMAT(2, 3);
static void
_cairo_pdf_document_close_stream (cairo_pdf_document_t *document);
static cairo_surface_t *
_cairo_pdf_surface_create_for_document (cairo_pdf_document_t *document,
double width,
double height);
static void
_cairo_pdf_surface_add_stream (cairo_pdf_surface_t *surface,
cairo_pdf_stream_t *stream);
static void
_cairo_pdf_surface_ensure_stream (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 unsigned int
_cairo_pdf_document_new_object (cairo_pdf_document_t *document)
{
cairo_status_t status;
cairo_pdf_object_t object;
object.offset = _cairo_output_stream_get_position (document->output_stream);
status = _cairo_array_append (&document->objects, &object);
if (status)
return 0;
return document->next_available_id++;
}
static void
_cairo_pdf_document_update_object (cairo_pdf_document_t *document,
unsigned int id)
{
cairo_pdf_object_t *object;
object = _cairo_array_index (&document->objects, id - 1);
object->offset = _cairo_output_stream_get_position (document->output_stream);
}
static void
_cairo_pdf_surface_add_stream (cairo_pdf_surface_t *surface,
cairo_pdf_stream_t *stream)
{
/* XXX: Should be checking the return value here. */
_cairo_array_append (&surface->streams, &stream);
surface->current_stream = stream;
}
static void
_cairo_pdf_surface_add_pattern (cairo_pdf_surface_t *surface, unsigned int id)
{
cairo_pdf_resource_t resource;
resource.id = id;
/* XXX: Should be checking the return value here. */
_cairo_array_append (&surface->patterns, &resource);
}
static unsigned int
_cairo_pdf_surface_add_alpha (cairo_pdf_surface_t *surface, double alpha)
{
int num_alphas, i;
double other;
num_alphas = _cairo_array_num_elements (&surface->alphas);
for (i = 0; i < num_alphas; i++) {
_cairo_array_copy_element (&surface->alphas, i, &other);
if (alpha == other)
return i;
}
/* XXX: Should be checking the return value here. */
_cairo_array_append (&surface->alphas, &alpha);
return _cairo_array_num_elements (&surface->alphas) - 1;
}
static cairo_surface_t *
_cairo_pdf_surface_create_for_stream_internal (cairo_output_stream_t *stream,
double width,
double height)
{
cairo_pdf_document_t *document;
cairo_surface_t *target;
document = _cairo_pdf_document_create (stream, width, height);
if (document == NULL) {
_cairo_error (CAIRO_STATUS_NO_MEMORY);
return (cairo_surface_t*) &_cairo_surface_nil;
}
target = _cairo_pdf_surface_create_for_document (document, width, height);
document->owner = target;
_cairo_pdf_document_destroy (document);
return _cairo_paginated_surface_create (target,
CAIRO_CONTENT_COLOR_ALPHA,
width, height,
&cairo_pdf_surface_paginated_backend);
}
/**
* cairo_pdf_surface_create_for_stream:
* @write: a #cairo_write_func_t to accept the output data
* @closure: the closure argument for @write
* @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 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.
*/
cairo_surface_t *
cairo_pdf_surface_create_for_stream (cairo_write_func_t write,
void *closure,
double width_in_points,
double height_in_points)
{
cairo_status_t status;
cairo_output_stream_t *stream;
stream = _cairo_output_stream_create (write, NULL, closure);
status = _cairo_output_stream_get_status (stream);
if (status) {
_cairo_error (status);
return (cairo_surface_t*) &_cairo_surface_nil;
}
return _cairo_pdf_surface_create_for_stream_internal (stream,
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.
**/
cairo_surface_t *
cairo_pdf_surface_create (const char *filename,
double width_in_points,
double height_in_points)
{
cairo_status_t status;
cairo_output_stream_t *stream;
stream = _cairo_output_stream_create_for_filename (filename);
status = _cairo_output_stream_get_status (stream);
if (status) {
_cairo_error (status);
return (cairo_surface_t*) &_cairo_surface_nil;
}
return _cairo_pdf_surface_create_for_stream_internal (stream,
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;
}
/**
* cairo_pdf_surface_set_dpi:
* @surface: a postscript cairo_surface_t
* @x_dpi: horizontal dpi
* @y_dpi: vertical dpi
*
* Set the horizontal and vertical resolution for image fallbacks.
* When the pdf backend needs to fall back to image overlays, it will
* use this resolution. These DPI values are not used for any other
* purpose, (in particular, they do not have any bearing on the size
* passed to cairo_pdf_surface_create() nor on the CTM).
**/
void
cairo_pdf_surface_set_dpi (cairo_surface_t *surface,
double x_dpi,
double y_dpi)
{
cairo_surface_t *target;
cairo_pdf_surface_t *pdf_surface;
if (! _cairo_surface_is_paginated (surface)) {
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return;
}
target = _cairo_paginated_surface_get_target (surface);
if (! _cairo_surface_is_pdf (target)) {
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return;
}
pdf_surface = (cairo_pdf_surface_t *) target;
pdf_surface->document->x_dpi = x_dpi;
pdf_surface->document->y_dpi = y_dpi;
}
static cairo_surface_t *
_cairo_pdf_surface_create_for_document (cairo_pdf_document_t *document,
double width,
double height)
{
cairo_pdf_surface_t *surface;
surface = malloc (sizeof (cairo_pdf_surface_t));
if (surface == NULL) {
_cairo_error (CAIRO_STATUS_NO_MEMORY);
return (cairo_surface_t*) &_cairo_surface_nil;
}
_cairo_surface_init (&surface->base, &cairo_pdf_surface_backend);
surface->width = width;
surface->height = height;
surface->document = _cairo_pdf_document_reference (document);
_cairo_array_init (&surface->streams, sizeof (cairo_pdf_stream_t *));
_cairo_array_init (&surface->patterns, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&surface->xobjects, sizeof (cairo_pdf_resource_t));
_cairo_array_init (&surface->alphas, sizeof (double));
_cairo_array_init (&surface->fonts, sizeof (cairo_pdf_resource_t));
surface->has_clip = FALSE;
surface->paginated_mode = CAIRO_PAGINATED_MODE_ANALYZE;
return &surface->base;
}
static void
_cairo_pdf_surface_clear (cairo_pdf_surface_t *surface)
{
int num_streams, i;
cairo_pdf_stream_t *stream;
num_streams = _cairo_array_num_elements (&surface->streams);
for (i = 0; i < num_streams; i++) {
_cairo_array_copy_element (&surface->streams, i, &stream);
free (stream);
}
_cairo_array_truncate (&surface->streams, 0);
_cairo_array_truncate (&surface->patterns, 0);
_cairo_array_truncate (&surface->xobjects, 0);
_cairo_array_truncate (&surface->alphas, 0);
_cairo_array_truncate (&surface->fonts, 0);
}
static cairo_surface_t *
_cairo_pdf_surface_create_similar (void *abstract_src,
cairo_content_t content,
int width,
int height)
{
cairo_format_t format = _cairo_format_from_content (content);
/* Just return an image for now, until PDF surface can be used
* as source. */
return cairo_image_surface_create (format, width, height);
}
static cairo_pdf_stream_t *
_cairo_pdf_document_open_stream (cairo_pdf_document_t *document,
const char *fmt,
...)
{
cairo_output_stream_t *output_stream = document->output_stream;
cairo_pdf_stream_t *stream;
va_list ap;
stream = malloc (sizeof (cairo_pdf_stream_t));
if (stream == NULL) {
return NULL;
}
stream->id = _cairo_pdf_document_new_object (document);
stream->length_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output_stream,
"%d 0 obj\r\n"
"<< /Length %d 0 R\r\n",
stream->id,
stream->length_id);
if (fmt != NULL) {
va_start (ap, fmt);
_cairo_output_stream_vprintf (output_stream, fmt, ap);
va_end (ap);
}
_cairo_output_stream_printf (output_stream,
">>\r\n"
"stream\r\n");
stream->start_offset = _cairo_output_stream_get_position (output_stream);
document->current_stream = stream;
return stream;
}
static void
_cairo_pdf_document_close_stream (cairo_pdf_document_t *document)
{
cairo_output_stream_t *output_stream = document->output_stream;
long length;
cairo_pdf_stream_t *stream;
stream = document->current_stream;
if (stream == NULL)
return;
length = _cairo_output_stream_get_position (output_stream) -
stream->start_offset;
_cairo_output_stream_printf (output_stream,
"endstream\r\n"
"endobj\r\n");
_cairo_pdf_document_update_object (document, stream->length_id);
_cairo_output_stream_printf (output_stream,
"%d 0 obj\r\n"
" %ld\r\n"
"endobj\r\n",
stream->length_id,
length);
document->current_stream = NULL;
}
static cairo_status_t
_cairo_pdf_surface_finish (void *abstract_surface)
{
cairo_status_t status;
cairo_pdf_surface_t *surface = abstract_surface;
cairo_pdf_document_t *document = surface->document;
if (surface->current_stream == document->current_stream)
_cairo_pdf_document_close_stream (document);
if (document->owner == &surface->base)
status = _cairo_pdf_document_finish (document);
else
status = CAIRO_STATUS_SUCCESS;
_cairo_pdf_document_destroy (document);
_cairo_array_fini (&surface->streams);
_cairo_array_fini (&surface->patterns);
_cairo_array_fini (&surface->xobjects);
_cairo_array_fini (&surface->alphas);
_cairo_array_fini (&surface->fonts);
return status;
}
static void
_cairo_pdf_surface_ensure_stream (cairo_pdf_surface_t *surface)
{
cairo_pdf_document_t *document = surface->document;
cairo_pdf_stream_t *stream;
cairo_output_stream_t *output = document->output_stream;
if (document->current_stream == NULL ||
document->current_stream != surface->current_stream) {
_cairo_pdf_document_close_stream (document);
stream = _cairo_pdf_document_open_stream (document,
" /Type /XObject\r\n"
" /Subtype /Form\r\n"
" /BBox [ 0 0 %f %f ]\r\n",
surface->width,
surface->height);
_cairo_pdf_surface_add_stream (surface, stream);
/* If this is the first stream we open for this surface,
* output the cairo to PDF transformation matrix. */
if (_cairo_array_num_elements (&surface->streams) == 1)
_cairo_output_stream_printf (output,
"1 0 0 -1 0 %f cm\r\n",
document->height);
}
}
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)
return NULL;
compress (compressed, compressed_size, data, data_size);
return compressed;
}
/* Emit alpha channel from the image into the given data, providing
* and 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
emit_smask (cairo_pdf_document_t *document,
cairo_image_surface_t *image,
unsigned int *id_ret)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_output_stream_t *output = document->output_stream;
cairo_pdf_stream_t *smask_stream;
char *alpha, *alpha_compressed;
unsigned long alpha_size, alpha_compressed_size;
pixman_bits_t *pixel;
int i, x, y;
cairo_bool_t opaque;
uint8_t a;
/* This is the only image format we support, which simplfies things. */
assert (image->format == CAIRO_FORMAT_ARGB32);
alpha_size = image->height * image->width;
alpha = malloc (alpha_size);
if (alpha == NULL) {
status = CAIRO_STATUS_NO_MEMORY;
goto CLEANUP;
}
opaque = TRUE;
i = 0;
for (y = 0; y < image->height; y++) {
pixel = (pixman_bits_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel++) {
a = (*pixel & 0xff000000) >> 24;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
}
}
/* Bail out without emitting smask if it's all opaque. */
if (opaque) {
*id_ret = 0;
goto CLEANUP_ALPHA;
}
alpha_compressed = compress_dup (alpha, alpha_size, &alpha_compressed_size);
if (alpha_compressed == NULL) {
status = CAIRO_STATUS_NO_MEMORY;
goto CLEANUP_ALPHA;
}
smask_stream = _cairo_pdf_document_open_stream (document,
" /Type /XObject\r\n"
" /Subtype /Image\r\n"
" /Width %d\r\n"
" /Height %d\r\n"
" /ColorSpace /DeviceGray\r\n"
" /BitsPerComponent 8\r\n"
" /Filter /FlateDecode\r\n",
image->width, image->height);
_cairo_output_stream_write (output, alpha_compressed, alpha_compressed_size);
_cairo_output_stream_printf (output, "\r\n");
_cairo_pdf_document_close_stream (document);
*id_ret = smask_stream->id;
free (alpha_compressed);
CLEANUP_ALPHA:
free (alpha);
CLEANUP:
return status;
}
/* Emit image data into the given document, providing an id that can
* be used to reference the data in id_ret. */
static cairo_status_t
emit_image (cairo_pdf_document_t *document,
cairo_image_surface_t *image,
unsigned int *id_ret)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_output_stream_t *output = document->output_stream;
cairo_pdf_stream_t *image_stream;
char *rgb, *compressed;
unsigned long rgb_size, compressed_size;
pixman_bits_t *pixel;
int i, x, y;
unsigned int smask_id;
cairo_bool_t need_smask;
/* These are the only image formats we currently support, (which
* makes things a lot simpler here). This is enforeced through
* _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);
rgb_size = image->height * image->width * 3;
rgb = malloc (rgb_size);
if (rgb == NULL) {
status = CAIRO_STATUS_NO_MEMORY;
goto CLEANUP;
}
i = 0;
for (y = 0; y < image->height; y++) {
pixel = (pixman_bits_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 {
rgb[i++] = (*pixel & 0x00ff0000) >> 16;
rgb[i++] = (*pixel & 0x0000ff00) >> 8;
rgb[i++] = (*pixel & 0x000000ff) >> 0;
}
}
}
_cairo_pdf_document_close_stream (document);
compressed = compress_dup (rgb, rgb_size, &compressed_size);
if (compressed == NULL) {
status = CAIRO_STATUS_NO_MEMORY;
goto CLEANUP_RGB;
}
need_smask = FALSE;
if (image->format == CAIRO_FORMAT_ARGB32) {
status = emit_smask (document, image, &smask_id);
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)
image_stream = _cairo_pdf_document_open_stream (document,
IMAGE_DICTIONARY
" /SMask %d 0 R\r\n",
image->width, image->height,
smask_id);
else
image_stream = _cairo_pdf_document_open_stream (document,
IMAGE_DICTIONARY,
image->width, image->height);
#undef IMAGE_DICTIONARY
_cairo_output_stream_write (output, compressed, compressed_size);
_cairo_output_stream_printf (output, "\r\n");
_cairo_pdf_document_close_stream (document);
*id_ret = image_stream->id;
CLEANUP_COMPRESSED:
free (compressed);
CLEANUP_RGB:
free (rgb);
CLEANUP:
return status;
}
static cairo_status_t
emit_solid_pattern (cairo_pdf_surface_t *surface,
cairo_solid_pattern_t *pattern)
{
cairo_pdf_document_t *document = surface->document;
cairo_output_stream_t *output = document->output_stream;
unsigned int alpha;
alpha = _cairo_pdf_surface_add_alpha (surface, pattern->color.alpha);
_cairo_pdf_surface_ensure_stream (surface);
/* With some work, we could separate the stroking
* or non-stroking color here as actually needed. */
_cairo_output_stream_printf (output,
"%f %f %f RG "
"%f %f %f rg "
"/a%d gs\r\n",
pattern->color.red,
pattern->color.green,
pattern->color.blue,
pattern->color.red,
pattern->color.green,
pattern->color.blue,
alpha);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
emit_surface_pattern (cairo_pdf_surface_t *dst,
cairo_surface_pattern_t *pattern)
{
cairo_pdf_document_t *document = dst->document;
cairo_output_stream_t *output = document->output_stream;
cairo_pdf_stream_t *stream;
cairo_image_surface_t *image;
void *image_extra;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
unsigned int id, alpha;
cairo_matrix_t cairo_p2d, pdf_p2d;
cairo_extend_t extend = cairo_pattern_get_extend (&pattern->base);
int xstep, ystep;
cairo_rectangle_t dst_extents;
/* XXX: Should do something clever here for PDF source surfaces ? */
status = _cairo_surface_acquire_source_image (pattern->surface, &image, &image_extra);
if (status)
return status;
_cairo_pdf_document_close_stream (document);
status = emit_image (dst->document, image, &id);
if (status)
goto BAIL;
_cairo_surface_get_extents (&dst->base, &dst_extents);
/* In 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 the larger of the image size and the extents of
* the destination surface. That way we guarantee the pattern will
* not repeat.
*/
switch (extend) {
case CAIRO_EXTEND_NONE:
xstep = MAX(image->width, dst_extents.width);
ystep = MAX(image->height, dst_extents.height);
break;
case CAIRO_EXTEND_REPEAT:
xstep = image->width;
ystep = image->height;
break;
default:
ASSERT_NOT_REACHED; /* all others should be analyzed away */
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 patrix 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;
cairo_matrix_invert (&cairo_p2d);
cairo_matrix_init_identity (&pdf_p2d);
cairo_matrix_translate (&pdf_p2d, 0.0, dst_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, image->height);
cairo_matrix_scale (&pdf_p2d, 1.0, -1.0);
stream = _cairo_pdf_document_open_stream (document,
" /BBox [0 0 %d %d]\r\n"
" /XStep %d\r\n"
" /YStep %d\r\n"
" /PatternType 1\r\n"
" /TilingType 1\r\n"
" /PaintType 1\r\n"
" /Matrix [ %f %f %f %f %f %f ]\r\n"
" /Resources << /XObject << /res%d %d 0 R >> >>\r\n",
image->width, image->height,
xstep, ystep,
pdf_p2d.xx, pdf_p2d.yx,
pdf_p2d.xy, pdf_p2d.yy,
pdf_p2d.x0, pdf_p2d.y0,
id, id);
_cairo_output_stream_printf (output,
"q %d 0 0 %d 0 0 cm /res%d Do Q\r\n",
image->width, image->height,
id);
_cairo_pdf_surface_add_pattern (dst, stream->id);
_cairo_pdf_surface_ensure_stream (dst);
alpha = _cairo_pdf_surface_add_alpha (dst, 1.0);
/* With some work, we could separate the stroking
* or non-stroking pattern here as actually needed. */
_cairo_output_stream_printf (output,
"/Pattern CS /res%d SCN "
"/Pattern cs /res%d scn "
"/a%d gs\r\n",
stream->id, stream->id, alpha);
BAIL:
_cairo_surface_release_source_image (pattern->surface, image, image_extra);
return status;
}
typedef struct _cairo_pdf_color_stop {
double offset;
unsigned int gradient_id;
unsigned char color_char[4];
} cairo_pdf_color_stop_t;
static unsigned int
emit_linear_colorgradient (cairo_pdf_document_t *document,
cairo_pdf_color_stop_t *stop1,
cairo_pdf_color_stop_t *stop2)
{
cairo_output_stream_t *output = document->output_stream;
unsigned int function_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /FunctionType 0\r\n"
" /Domain [ 0 1 ]\r\n"
" /Size [ 2 ]\r\n"
" /BitsPerSample 8\r\n"
" /Range [ 0 1 0 1 0 1 ]\r\n"
" /Length 6\r\n"
">>\r\n"
"stream\r\n",
function_id);
_cairo_output_stream_write (output, stop1->color_char, 3);
_cairo_output_stream_write (output, stop2->color_char, 3);
_cairo_output_stream_printf (output,
"\r\n"
"endstream\r\n"
"endobj\r\n");
return function_id;
}
static unsigned int
emit_stiched_colorgradient (cairo_pdf_document_t *document,
unsigned int n_stops,
cairo_pdf_color_stop_t stops[])
{
cairo_output_stream_t *output = document->output_stream;
unsigned int function_id;
unsigned int i;
/* emit linear gradients between pairs of subsequent stops... */
for (i = 0; i < n_stops-1; i++) {
stops[i].gradient_id = emit_linear_colorgradient (document,
&stops[i],
&stops[i+1]);
}
/* ... and stich them together */
function_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /FunctionType 3\r\n"
" /Domain [ 0 1 ]\r\n"
" /Functions [ ",
function_id);
for (i = 0; i < n_stops-1; i++)
_cairo_output_stream_printf (output, "%d 0 R ", stops[i].gradient_id);
_cairo_output_stream_printf (output,
"]\r\n"
" /Bounds [ ");
for (i = 1; i < n_stops-1; i++)
_cairo_output_stream_printf (output, "%f ", stops[i].offset);
_cairo_output_stream_printf (output,
"]\r\n"
" /Encode [ ");
for (i = 1; i < n_stops; i++)
_cairo_output_stream_printf (output, "0 1 ");
_cairo_output_stream_printf (output,
"]\r\n"
">>\r\n"
"endobj\r\n");
return function_id;
}
#define COLOR_STOP_EPSILLON 1e-6
static unsigned int
emit_pattern_stops (cairo_pdf_surface_t *surface, cairo_gradient_pattern_t *pattern)
{
cairo_pdf_document_t *document = surface->document;
unsigned int function_id;
cairo_pdf_color_stop_t *allstops, *stops;
unsigned int n_stops;
unsigned int i;
function_id = _cairo_pdf_document_new_object (document);
allstops = malloc ((pattern->n_stops + 2) * sizeof (cairo_pdf_color_stop_t));
if (allstops == NULL) {
_cairo_error (CAIRO_STATUS_NO_MEMORY);
return 0;
}
stops = &allstops[1];
n_stops = pattern->n_stops;
for (i = 0; i < pattern->n_stops; i++) {
stops[i].color_char[0] = pattern->stops[i].color.red >> 8;
stops[i].color_char[1] = pattern->stops[i].color.green >> 8;
stops[i].color_char[2] = pattern->stops[i].color.blue >> 8;
stops[i].color_char[3] = pattern->stops[i].color.alpha >> 8;
stops[i].offset = _cairo_fixed_to_double (pattern->stops[i].x);
}
/* make sure first offset is 0.0 and last offset is 1.0. (Otherwise Acrobat
* Reader chokes.) */
if (stops[0].offset > COLOR_STOP_EPSILLON) {
memcpy (allstops, stops, sizeof (cairo_pdf_color_stop_t));
stops = allstops;
stops[0].offset = 0.0;
n_stops++;
}
if (stops[n_stops-1].offset < 1.0 - COLOR_STOP_EPSILLON) {
memcpy (&stops[n_stops],
&stops[n_stops - 1],
sizeof (cairo_pdf_color_stop_t));
stops[n_stops].offset = 1.0;
n_stops++;
}
if (n_stops == 2) {
/* no need for stiched function */
function_id = emit_linear_colorgradient (document, &stops[0], &stops[1]);
} else {
/* multiple stops: stich. XXX possible optimization: regulary spaced
* stops do not require stiching. XXX */
function_id = emit_stiched_colorgradient (document,
n_stops,
stops);
}
free (allstops);
return function_id;
}
static cairo_status_t
emit_linear_pattern (cairo_pdf_surface_t *surface, cairo_linear_pattern_t *pattern)
{
cairo_pdf_document_t *document = surface->document;
cairo_output_stream_t *output = document->output_stream;
unsigned int function_id, pattern_id, alpha;
double x0, y0, x1, y1;
cairo_matrix_t p2u;
_cairo_pdf_document_close_stream (document);
function_id = emit_pattern_stops (surface, &pattern->base);
if (function_id == 0)
return CAIRO_STATUS_NO_MEMORY;
p2u = pattern->base.base.matrix;
cairo_matrix_invert (&p2u);
x0 = _cairo_fixed_to_double (pattern->gradient.p1.x);
y0 = _cairo_fixed_to_double (pattern->gradient.p1.y);
cairo_matrix_transform_point (&p2u, &x0, &y0);
x1 = _cairo_fixed_to_double (pattern->gradient.p2.x);
y1 = _cairo_fixed_to_double (pattern->gradient.p2.y);
cairo_matrix_transform_point (&p2u, &x1, &y1);
pattern_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ 1 0 0 -1 0 %f ]\r\n"
" /Shading\r\n"
" << /ShadingType 2\r\n"
" /ColorSpace /DeviceRGB\r\n"
" /Coords [ %f %f %f %f ]\r\n"
" /Function %d 0 R\r\n"
" /Extend [ true true ]\r\n"
" >>\r\n"
">>\r\n"
"endobj\r\n",
pattern_id,
document->height,
x0, y0, x1, y1,
function_id);
_cairo_pdf_surface_add_pattern (surface, pattern_id);
_cairo_pdf_surface_ensure_stream (surface);
alpha = _cairo_pdf_surface_add_alpha (surface, 1.0);
/* Use pattern */
/* With some work, we could separate the stroking
* or non-stroking pattern here as actually needed. */
_cairo_output_stream_printf (output,
"/Pattern CS /res%d SCN "
"/Pattern cs /res%d scn "
"/a%d gs\r\n",
pattern_id, pattern_id, alpha);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
emit_radial_pattern (cairo_pdf_surface_t *surface, cairo_radial_pattern_t *pattern)
{
cairo_pdf_document_t *document = surface->document;
cairo_output_stream_t *output = document->output_stream;
unsigned int function_id, pattern_id, alpha;
double x0, y0, x1, y1, r0, r1;
cairo_matrix_t p2u;
_cairo_pdf_document_close_stream (document);
function_id = emit_pattern_stops (surface, &pattern->base);
if (function_id == 0)
return CAIRO_STATUS_NO_MEMORY;
p2u = pattern->base.base.matrix;
cairo_matrix_invert (&p2u);
x0 = _cairo_fixed_to_double (pattern->gradient.inner.x);
y0 = _cairo_fixed_to_double (pattern->gradient.inner.y);
r0 = _cairo_fixed_to_double (pattern->gradient.inner.radius);
cairo_matrix_transform_point (&p2u, &x0, &y0);
x1 = _cairo_fixed_to_double (pattern->gradient.outer.x);
y1 = _cairo_fixed_to_double (pattern->gradient.outer.y);
r1 = _cairo_fixed_to_double (pattern->gradient.outer.radius);
cairo_matrix_transform_point (&p2u, &x1, &y1);
/* FIXME: This is surely crack, but how should you scale a radius
* in a non-orthogonal coordinate system? */
cairo_matrix_transform_distance (&p2u, &r0, &r1);
/* FIXME: There is a difference between the cairo gradient extend
* semantics and PDF extend semantics. PDFs extend=false means
* that nothing is painted outside the gradient boundaries,
* whereas cairo takes this to mean that the end color is padded
* to infinity. Setting extend=true in PDF gives the cairo default
* behavoir, not yet sure how to implement the cairo mirror and
* repeat behaviour. */
pattern_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /Pattern\r\n"
" /PatternType 2\r\n"
" /Matrix [ 1 0 0 -1 0 %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"
" /Extend [ true true ]\r\n"
" >>\r\n"
">>\r\n"
"endobj\r\n",
pattern_id,
document->height,
x0, y0, r0, x1, y1, r1,
function_id);
_cairo_pdf_surface_add_pattern (surface, pattern_id);
_cairo_pdf_surface_ensure_stream (surface);
alpha = _cairo_pdf_surface_add_alpha (surface, 1.0);
/* Use pattern */
/* With some work, we could separate the stroking
* or non-stroking pattern here as actually needed. */
_cairo_output_stream_printf (output,
"/Pattern CS /res%d SCN "
"/Pattern cs /res%d scn "
"/a%d gs\r\n",
pattern_id, pattern_id, alpha);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
emit_pattern (cairo_pdf_surface_t *surface, cairo_pattern_t *pattern)
{
switch (pattern->type) {
case CAIRO_PATTERN_TYPE_SOLID:
return emit_solid_pattern (surface, (cairo_solid_pattern_t *) pattern);
case CAIRO_PATTERN_TYPE_SURFACE:
return emit_surface_pattern (surface, (cairo_surface_pattern_t *) pattern);
case CAIRO_PATTERN_TYPE_LINEAR:
return emit_linear_pattern (surface, (cairo_linear_pattern_t *) pattern);
case CAIRO_PATTERN_TYPE_RADIAL:
return emit_radial_pattern (surface, (cairo_radial_pattern_t *) pattern);
}
ASSERT_NOT_REACHED;
return CAIRO_STATUS_PATTERN_TYPE_MISMATCH;
}
static cairo_status_t
_cairo_pdf_path_move_to (void *closure, cairo_point_t *point)
{
cairo_output_stream_t *output_stream = closure;
_cairo_output_stream_printf (output_stream,
"%f %f m ",
_cairo_fixed_to_double (point->x),
_cairo_fixed_to_double (point->y));
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_path_line_to (void *closure, cairo_point_t *point)
{
cairo_output_stream_t *output_stream = closure;
_cairo_output_stream_printf (output_stream,
"%f %f l ",
_cairo_fixed_to_double (point->x),
_cairo_fixed_to_double (point->y));
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_path_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d)
{
cairo_output_stream_t *output_stream = closure;
_cairo_output_stream_printf (output_stream,
"%f %f %f %f %f %f c ",
_cairo_fixed_to_double (b->x),
_cairo_fixed_to_double (b->y),
_cairo_fixed_to_double (c->x),
_cairo_fixed_to_double (c->y),
_cairo_fixed_to_double (d->x),
_cairo_fixed_to_double (d->y));
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_path_close_path (void *closure)
{
cairo_output_stream_t *output_stream = closure;
_cairo_output_stream_printf (output_stream,
"h\r\n");
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_pdf_surface_copy_page (void *abstract_surface)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_pdf_document_t *document = surface->document;
return _cairo_pdf_document_add_page (document, surface);
}
static cairo_int_status_t
_cairo_pdf_surface_show_page (void *abstract_surface)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_pdf_document_t *document = surface->document;
cairo_int_status_t status;
status = _cairo_pdf_document_add_page (document, 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_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 aribitray 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;
}
typedef struct _pdf_stroke {
cairo_output_stream_t *output_stream;
cairo_matrix_t *ctm_inverse;
} pdf_stroke_t;
static cairo_status_t
_cairo_pdf_stroke_move_to (void *closure, cairo_point_t *point)
{
pdf_stroke_t *stroke = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
cairo_matrix_transform_point (stroke->ctm_inverse, &x, &y);
_cairo_output_stream_printf (stroke->output_stream,
"%f %f m ", x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_stroke_line_to (void *closure, cairo_point_t *point)
{
pdf_stroke_t *stroke = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
cairo_matrix_transform_point (stroke->ctm_inverse, &x, &y);
_cairo_output_stream_printf (stroke->output_stream,
"%f %f l ", x, y);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_stroke_curve_to (void *closure,
cairo_point_t *b,
cairo_point_t *c,
cairo_point_t *d)
{
pdf_stroke_t *stroke = closure;
double bx = _cairo_fixed_to_double (b->x);
double by = _cairo_fixed_to_double (b->y);
double cx = _cairo_fixed_to_double (c->x);
double cy = _cairo_fixed_to_double (c->y);
double dx = _cairo_fixed_to_double (d->x);
double dy = _cairo_fixed_to_double (d->y);
cairo_matrix_transform_point (stroke->ctm_inverse, &bx, &by);
cairo_matrix_transform_point (stroke->ctm_inverse, &cx, &cy);
cairo_matrix_transform_point (stroke->ctm_inverse, &dx, &dy);
_cairo_output_stream_printf (stroke->output_stream,
"%f %f %f %f %f %f c ",
bx, by, cx, cy, dx, dy);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_pdf_stroke_close_path (void *closure)
{
pdf_stroke_t *stroke = closure;
_cairo_output_stream_printf (stroke->output_stream,
"h\r\n");
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_pdf_surface_intersect_clip_path (void *dst,
cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias)
{
cairo_pdf_surface_t *surface = dst;
cairo_pdf_document_t *document = surface->document;
cairo_output_stream_t *output = document->output_stream;
cairo_status_t status;
const char *pdf_operator;
_cairo_pdf_surface_ensure_stream (surface);
if (path == NULL) {
if (surface->has_clip)
_cairo_output_stream_printf (output, "Q\r\n");
surface->has_clip = FALSE;
return CAIRO_STATUS_SUCCESS;
}
if (!surface->has_clip) {
_cairo_output_stream_printf (output, "q ");
surface->has_clip = TRUE;
}
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_pdf_path_move_to,
_cairo_pdf_path_line_to,
_cairo_pdf_path_curve_to,
_cairo_pdf_path_close_path,
document->output_stream);
switch (fill_rule) {
case CAIRO_FILL_RULE_WINDING:
pdf_operator = "W";
break;
case CAIRO_FILL_RULE_EVEN_ODD:
pdf_operator = "W*";
break;
default:
ASSERT_NOT_REACHED;
}
_cairo_output_stream_printf (document->output_stream,
"%s n\r\n",
pdf_operator);
return status;
}
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);
}
static cairo_pdf_document_t *
_cairo_pdf_document_create (cairo_output_stream_t *output_stream,
double width,
double height)
{
cairo_pdf_document_t *document;
document = malloc (sizeof (cairo_pdf_document_t));
if (document == NULL)
return NULL;
document->output_stream = output_stream;
document->ref_count = 1;
document->owner = NULL;
document->finished = FALSE;
document->width = width;
document->height = height;
document->x_dpi = DEFAULT_DPI;
document->y_dpi = DEFAULT_DPI;
_cairo_array_init (&document->objects, sizeof (cairo_pdf_object_t));
_cairo_array_init (&document->pages, sizeof (unsigned int));
document->next_available_id = 1;
document->current_stream = NULL;
document->pages_id = _cairo_pdf_document_new_object (document);
_cairo_array_init (&document->fonts, sizeof (cairo_font_subset_t *));
/* Document header */
_cairo_output_stream_printf (output_stream,
"%%PDF-1.4\r\n");
return document;
}
static unsigned int
_cairo_pdf_document_write_info (cairo_pdf_document_t *document)
{
cairo_output_stream_t *output = document->output_stream;
unsigned int id;
id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Creator (cairographics.org)\r\n"
" /Producer (cairographics.org)\r\n"
">>\r\n"
"endobj\r\n",
id);
return id;
}
static void
_cairo_pdf_document_write_pages (cairo_pdf_document_t *document)
{
cairo_output_stream_t *stream = document->output_stream;
unsigned int page_id;
int num_pages, i;
_cairo_pdf_document_update_object (document, document->pages_id);
_cairo_output_stream_printf (stream,
"%d 0 obj\r\n"
"<< /Type /Pages\r\n"
" /Kids [ ",
document->pages_id);
num_pages = _cairo_array_num_elements (&document->pages);
for (i = 0; i < num_pages; i++) {
_cairo_array_copy_element (&document->pages, i, &page_id);
_cairo_output_stream_printf (stream, "%d 0 R ", page_id);
}
_cairo_output_stream_printf (stream, "]\r\n");
_cairo_output_stream_printf (stream, " /Count %d\r\n", num_pages);
/* TODO: Figure out wich other defaults to be inherited by /Page
* objects. */
_cairo_output_stream_printf (stream,
" /MediaBox [ 0 0 %f %f ]\r\n"
">>\r\n"
"endobj\r\n",
document->width,
document->height);
}
static cairo_status_t
_cairo_pdf_document_write_fonts (cairo_pdf_document_t *document)
{
cairo_output_stream_t *output = document->output_stream;
cairo_font_subset_t *font;
int num_fonts, i, j;
const char *data;
char *compressed;
unsigned long data_size, compressed_size;
unsigned int stream_id, descriptor_id;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
num_fonts = _cairo_array_num_elements (&document->fonts);
for (i = 0; i < num_fonts; i++) {
_cairo_array_copy_element (&document->fonts, i, &font);
status = _cairo_font_subset_generate (font, &data, &data_size);
if (status)
goto fail;
compressed = compress_dup (data, data_size, &compressed_size);
if (compressed == NULL) {
status = CAIRO_STATUS_NO_MEMORY;
goto fail;
}
stream_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (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_size,
data_size);
_cairo_output_stream_write (output, compressed, compressed_size);
_cairo_output_stream_printf (output,
"\r\n"
"endstream\r\n"
"endobj\r\n");
free (compressed);
descriptor_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /FontDescriptor\r\n"
" /FontName /7%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"
" /FontFile2 %u 0 R\r\n"
">>\r\n"
"endobj\r\n",
descriptor_id,
font->base_font,
font->x_min,
font->y_min,
font->x_max,
font->y_max,
font->ascent,
font->descent,
stream_id);
_cairo_pdf_document_update_object (document, font->font_id);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /Font\r\n"
" /Subtype /TrueType\r\n"
" /BaseFont /%s\r\n"
" /FirstChar 0\r\n"
" /LastChar %d\r\n"
" /FontDescriptor %d 0 R\r\n"
" /Widths ",
font->font_id,
font->base_font,
font->num_glyphs,
descriptor_id);
_cairo_output_stream_printf (output,
"[");
for (j = 0; j < font->num_glyphs; j++)
_cairo_output_stream_printf (output,
" %d",
font->widths[j]);
_cairo_output_stream_printf (output,
" ]\r\n"
">>\r\n"
"endobj\r\n");
fail:
_cairo_font_subset_destroy (font);
}
return status;
}
static unsigned int
_cairo_pdf_document_write_catalog (cairo_pdf_document_t *document)
{
cairo_output_stream_t *output = document->output_stream;
unsigned int id;
id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /Catalog\r\n"
" /Pages %d 0 R\r\n"
">>\r\n"
"endobj\r\n",
id, document->pages_id);
return id;
}
static long
_cairo_pdf_document_write_xref (cairo_pdf_document_t *document)
{
cairo_output_stream_t *output = document->output_stream;
cairo_pdf_object_t *object;
int num_objects, i;
long offset;
char buffer[11];
num_objects = _cairo_array_num_elements (&document->objects);
offset = _cairo_output_stream_get_position (output);
_cairo_output_stream_printf (output,
"xref\r\n"
"%d %d\r\n",
0, num_objects + 1);
_cairo_output_stream_printf (output,
"0000000000 65535 f\r\n");
for (i = 0; i < num_objects; i++) {
object = _cairo_array_index (&document->objects, i);
snprintf (buffer, sizeof buffer, "%010ld", object->offset);
_cairo_output_stream_printf (output,
"%s 00000 n\r\n", buffer);
}
return offset;
}
static cairo_pdf_document_t *
_cairo_pdf_document_reference (cairo_pdf_document_t *document)
{
document->ref_count++;
return document;
}
static void
_cairo_pdf_document_destroy (cairo_pdf_document_t *document)
{
document->ref_count--;
if (document->ref_count > 0)
return;
_cairo_pdf_document_finish (document);
free (document);
}
static cairo_status_t
_cairo_pdf_document_finish (cairo_pdf_document_t *document)
{
cairo_status_t status;
cairo_output_stream_t *output = document->output_stream;
long offset;
unsigned int info_id, catalog_id;
if (document->finished)
return CAIRO_STATUS_SUCCESS;
_cairo_pdf_document_close_stream (document);
_cairo_pdf_document_write_pages (document);
_cairo_pdf_document_write_fonts (document);
info_id = _cairo_pdf_document_write_info (document);
catalog_id = _cairo_pdf_document_write_catalog (document);
offset = _cairo_pdf_document_write_xref (document);
_cairo_output_stream_printf (output,
"trailer\r\n"
"<< /Size %d\r\n"
" /Root %d 0 R\r\n"
" /Info %d 0 R\r\n"
">>\r\n",
document->next_available_id,
catalog_id,
info_id);
_cairo_output_stream_printf (output,
"startxref\r\n"
"%ld\r\n"
"%%%%EOF\r\n",
offset);
status = _cairo_output_stream_get_status (output);
_cairo_output_stream_destroy (output);
_cairo_array_fini (&document->objects);
_cairo_array_fini (&document->pages);
_cairo_array_fini (&document->fonts);
document->finished = TRUE;
return status;
}
static cairo_status_t
_cairo_pdf_document_add_page (cairo_pdf_document_t *document,
cairo_pdf_surface_t *surface)
{
cairo_status_t status;
cairo_pdf_stream_t *stream;
cairo_pdf_resource_t *res;
cairo_output_stream_t *output = document->output_stream;
unsigned int page_id;
double alpha;
int num_streams, num_alphas, num_resources, i;
assert (!document->finished);
_cairo_pdf_surface_ensure_stream (surface);
if (surface->has_clip) {
_cairo_output_stream_printf (output, "Q\r\n");
surface->has_clip = FALSE;
}
_cairo_pdf_document_close_stream (document);
page_id = _cairo_pdf_document_new_object (document);
_cairo_output_stream_printf (output,
"%d 0 obj\r\n"
"<< /Type /Page\r\n"
" /Parent %d 0 R\r\n"
" /Contents [",
page_id,
document->pages_id);
num_streams = _cairo_array_num_elements (&surface->streams);
for (i = 0; i < num_streams; i++) {
_cairo_array_copy_element (&surface->streams, i, &stream);
_cairo_output_stream_printf (output,
" %d 0 R",
stream->id);
}
_cairo_output_stream_printf (output,
" ]\r\n"
" /Resources <<\r\n");
num_resources = _cairo_array_num_elements (&surface->fonts);
if (num_resources > 0) {
_cairo_output_stream_printf (output,
" /Font <<");
for (i = 0; i < num_resources; i++) {
res = _cairo_array_index (&surface->fonts, i);
_cairo_output_stream_printf (output,
" /res%d %d 0 R",
res->id, res->id);
}
_cairo_output_stream_printf (output,
" >>\r\n");
}
num_alphas = _cairo_array_num_elements (&surface->alphas);
if (num_alphas > 0) {
_cairo_output_stream_printf (output,
" /ExtGState <<\r\n");
for (i = 0; i < num_alphas; i++) {
/* With some work, we could separate the stroking
* or non-stroking alpha here as actually needed. */
_cairo_array_copy_element (&surface->alphas, i, &alpha);
_cairo_output_stream_printf (output,
" /a%d << /CA %f /ca %f >>\r\n",
i, alpha, alpha);
}
_cairo_output_stream_printf (output,
" >>\r\n");
}
num_resources = _cairo_array_num_elements (&surface->patterns);
if (num_resources > 0) {
_cairo_output_stream_printf (output,
" /Pattern <<");
for (i = 0; i < num_resources; i++) {
res = _cairo_array_index (&surface->patterns, i);
_cairo_output_stream_printf (output,
" /res%d %d 0 R",
res->id, res->id);
}
_cairo_output_stream_printf (output,
" >>\r\n");
}
num_resources = _cairo_array_num_elements (&surface->xobjects);
if (num_resources > 0) {
_cairo_output_stream_printf (output,
" /XObject <<");
for (i = 0; i < num_resources; i++) {
res = _cairo_array_index (&surface->xobjects, i);
_cairo_output_stream_printf (output,
" /res%d %d 0 R",
res->id, res->id);
}
_cairo_output_stream_printf (output,
" >>\r\n");
}
_cairo_output_stream_printf (output,
" >>\r\n"
">>\r\n"
"endobj\r\n");
status = _cairo_array_append (&document->pages, &page_id);
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 (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:
return TRUE;
case CAIRO_EXTEND_REFLECT:
case CAIRO_EXTEND_PAD:
return FALSE;
}
ASSERT_NOT_REACHED;
return FALSE;
}
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_SURFACE)
return _surface_pattern_supported ((cairo_surface_pattern_t *) pattern);
return FALSE;
}
static cairo_int_status_t
_operation_supported (cairo_pdf_surface_t *surface,
cairo_operator_t op,
cairo_pattern_t *pattern)
{
if (! _pattern_supported (pattern))
return FALSE;
/* XXX: We can probably support a fair amount more than just OVER,
* but this should cover many common cases at least. */
if (op == CAIRO_OPERATOR_OVER)
return TRUE;
return FALSE;
}
static cairo_int_status_t
_analyze_operation (cairo_pdf_surface_t *surface,
cairo_operator_t op,
cairo_pattern_t *pattern)
{
if (_operation_supported (surface, op, pattern))
return CAIRO_STATUS_SUCCESS;
else
return CAIRO_INT_STATUS_UNSUPPORTED;
}
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_pdf_document_t *document = surface->document;
cairo_status_t status;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return _analyze_operation (surface, op, source);
/* XXX: It would be nice to be able to assert this condition
* here. But, we actually allow one 'cheat' that is used when
* painting the final image-based fallbacks. The final fallbacks
* do have alpha which we support by blending with white. This is
* possible only because there is nothing between the fallback
* images and the paper, nor is anything painted above. */
/*
assert (_operation_supported (op, source));
*/
status = emit_pattern (surface, source);
if (status)
return status;
/* After emitting the pattern the current stream should belong to
* this surface, so no need to _cairo_pdf_surface_ensure_stream()
*/
assert (document->current_stream != NULL &&
document->current_stream == surface->current_stream);
_cairo_output_stream_printf (document->output_stream,
"0 0 %f %f re f\r\n",
surface->width, surface->height);
return _cairo_output_stream_get_status (document->output_stream);
}
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;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return CAIRO_INT_STATUS_UNSUPPORTED;
ASSERT_NOT_REACHED;
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static int
_cairo_pdf_line_cap (cairo_line_cap_t cap)
{
switch (cap) {
case CAIRO_LINE_CAP_BUTT:
return 0;
case CAIRO_LINE_CAP_ROUND:
return 1;
case CAIRO_LINE_CAP_SQUARE:
return 2;
default:
ASSERT_NOT_REACHED;
return 0;
}
}
static int
_cairo_pdf_line_join (cairo_line_join_t join)
{
switch (join) {
case CAIRO_LINE_JOIN_MITER:
return 0;
case CAIRO_LINE_JOIN_ROUND:
return 1;
case CAIRO_LINE_JOIN_BEVEL:
return 2;
default:
ASSERT_NOT_REACHED;
return 0;
}
}
static cairo_status_t
_cairo_pdf_surface_emit_stroke_style (cairo_pdf_surface_t *surface,
cairo_output_stream_t *stream,
cairo_stroke_style_t *style)
{
_cairo_output_stream_printf (stream,
"%f w\r\n",
style->line_width);
_cairo_output_stream_printf (stream,
"%d J\r\n",
_cairo_pdf_line_cap (style->line_cap));
_cairo_output_stream_printf (stream,
"%d j\r\n",
_cairo_pdf_line_join (style->line_join));
if (style->num_dashes) {
int d;
_cairo_output_stream_printf (stream, "[");
for (d = 0; d < style->num_dashes; d++)
_cairo_output_stream_printf (stream, " %f", style->dash[d]);
_cairo_output_stream_printf (stream, "] %f d\r\n",
style->dash_offset);
}
_cairo_output_stream_printf (stream,
"%f M ",
style->miter_limit);
return _cairo_output_stream_get_status (stream);
}
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_pdf_document_t *document = surface->document;
pdf_stroke_t stroke;
cairo_status_t status;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) {
/* XXX: Does PDF provide a way we can preserve this hint? For now,
* this will trigger a fallback. */
if (antialias == CAIRO_ANTIALIAS_NONE)
return CAIRO_INT_STATUS_UNSUPPORTED;
return _analyze_operation (surface, op, source);
}
assert (_operation_supported (surface, op, source));
status = emit_pattern (surface, source);
if (status)
return status;
/* After emitting the pattern the current stream should belong to
* this surface, so no need to _cairo_pdf_surface_ensure_stream()
*/
assert (document->current_stream != NULL &&
document->current_stream == surface->current_stream);
stroke.output_stream = document->output_stream;
stroke.ctm_inverse = ctm_inverse;
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_pdf_stroke_move_to,
_cairo_pdf_stroke_line_to,
_cairo_pdf_stroke_curve_to,
_cairo_pdf_stroke_close_path,
&stroke);
_cairo_output_stream_printf (document->output_stream,
"q %f %f %f %f %f %f cm\r\n",
ctm->xx, ctm->yx, ctm->xy, ctm->yy,
ctm->x0, ctm->y0);
status = _cairo_pdf_surface_emit_stroke_style (surface,
document->output_stream,
style);
if (status)
return status;
_cairo_output_stream_printf (document->output_stream, "S Q\r\n");
return status;
}
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_pdf_document_t *document = surface->document;
const char *pdf_operator;
cairo_status_t status;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) {
/* XXX: Does PDF provide a way we can preserve this hint? For now,
* this will trigger a fallback. */
if (antialias == CAIRO_ANTIALIAS_NONE)
return CAIRO_INT_STATUS_UNSUPPORTED;
return _analyze_operation (surface, op, source);
}
assert (_operation_supported (surface, op, source));
status = emit_pattern (surface, source);
if (status)
return status;
/* After emitting the pattern the current stream should belong to
* this surface, so no need to _cairo_pdf_surface_ensure_stream()
*/
assert (document->current_stream != NULL &&
document->current_stream == surface->current_stream);
status = _cairo_path_fixed_interpret (path,
CAIRO_DIRECTION_FORWARD,
_cairo_pdf_path_move_to,
_cairo_pdf_path_line_to,
_cairo_pdf_path_curve_to,
_cairo_pdf_path_close_path,
document->output_stream);
switch (fill_rule) {
case CAIRO_FILL_RULE_WINDING:
pdf_operator = "f";
break;
case CAIRO_FILL_RULE_EVEN_ODD:
pdf_operator = "f*";
break;
default:
ASSERT_NOT_REACHED;
}
_cairo_output_stream_printf (document->output_stream,
"%s\r\n",
pdf_operator);
return status;
}
static cairo_int_status_t
_cairo_pdf_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
const cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font)
{
cairo_pdf_surface_t *surface = abstract_surface;
cairo_pdf_document_t *document = surface->document;
cairo_path_fixed_t path;
cairo_status_t status;
if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
return _analyze_operation (surface, op, source);
assert (_operation_supported (surface, op, source));
status = emit_pattern (surface, source);
if (status)
return status;
/* After emitting the pattern the current stream should belong to
* this surface, so no need to _cairo_pdf_surface_ensure_stream()
*/
assert (document->current_stream != NULL &&
document->current_stream == surface->current_stream);
_cairo_path_fixed_init (&path);
_cairo_scaled_font_glyph_path (scaled_font, glyphs, num_glyphs, &path);
status = _cairo_pdf_surface_fill (surface, op, source,
&path, CAIRO_FILL_RULE_WINDING,
0.1, scaled_font->options.antialias);
_cairo_path_fixed_fini (&path);
return status;
}
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 */
_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 */
};
static const cairo_paginated_surface_backend_t cairo_pdf_surface_paginated_backend = {
NULL, /* start_page */
_cairo_pdf_surface_set_paginated_mode
};
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