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cairo/src/cairo-image-surface.c
Chris Wilson ae25f1c360 Alter definition of cairo_composite_rectangles_t 
This is a more useful definition that is able to individually track the
rectangles that compose the composite operation. This will be used by
the specialist compositors as a means to perform the common extents
determination for an operation.
2010-01-22 23:01:51 +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 © 2003 University of Southern California
*
* 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):
* Carl D. Worth <cworth@cworth.org>
*/
#include "cairoint.h"
#include "cairo-clip-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-error-private.h"
#include "cairo-region-private.h"
/* Limit on the width / height of an image surface in pixels. This is
* mainly determined by coordinates of things sent to pixman at the
* moment being in 16.16 format. */
#define MAX_IMAGE_SIZE 32767
static cairo_bool_t
_cairo_image_surface_is_size_valid (int width, int height)
{
return 0 <= width && width <= MAX_IMAGE_SIZE &&
0 <= height && height <= MAX_IMAGE_SIZE;
}
static cairo_format_t
_cairo_format_from_pixman_format (pixman_format_code_t pixman_format)
{
switch (pixman_format) {
case PIXMAN_a8r8g8b8:
return CAIRO_FORMAT_ARGB32;
case PIXMAN_x8r8g8b8:
return CAIRO_FORMAT_RGB24;
case PIXMAN_a8:
return CAIRO_FORMAT_A8;
case PIXMAN_a1:
return CAIRO_FORMAT_A1;
case PIXMAN_a8b8g8r8: case PIXMAN_x8b8g8r8: case PIXMAN_r8g8b8:
case PIXMAN_b8g8r8: case PIXMAN_r5g6b5: case PIXMAN_b5g6r5:
case PIXMAN_a1r5g5b5: case PIXMAN_x1r5g5b5: case PIXMAN_a1b5g5r5:
case PIXMAN_x1b5g5r5: case PIXMAN_a4r4g4b4: case PIXMAN_x4r4g4b4:
case PIXMAN_a4b4g4r4: case PIXMAN_x4b4g4r4: case PIXMAN_r3g3b2:
case PIXMAN_b2g3r3: case PIXMAN_a2r2g2b2: case PIXMAN_a2b2g2r2:
case PIXMAN_c8: case PIXMAN_g8: case PIXMAN_x4a4:
case PIXMAN_a4: case PIXMAN_r1g2b1: case PIXMAN_b1g2r1:
case PIXMAN_a1r1g1b1: case PIXMAN_a1b1g1r1: case PIXMAN_c4:
case PIXMAN_g4: case PIXMAN_g1:
case PIXMAN_yuy2: case PIXMAN_yv12:
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,11,9)
case PIXMAN_x2b10g10r10:
case PIXMAN_a2b10g10r10:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,14,1)
case PIXMAN_b8g8r8x8:
case PIXMAN_b8g8r8a8:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,15,16)
case PIXMAN_x2r10g10b10:
case PIXMAN_a2r10g10b10:
#endif
default:
return CAIRO_FORMAT_INVALID;
}
return CAIRO_FORMAT_INVALID;
}
static cairo_content_t
_cairo_content_from_pixman_format (pixman_format_code_t pixman_format)
{
switch (pixman_format) {
case PIXMAN_a8r8g8b8:
case PIXMAN_a8b8g8r8:
case PIXMAN_a1r5g5b5:
case PIXMAN_a1b5g5r5:
case PIXMAN_a4r4g4b4:
case PIXMAN_a4b4g4r4:
case PIXMAN_a2r2g2b2:
case PIXMAN_a2b2g2r2:
case PIXMAN_a1r1g1b1:
case PIXMAN_a1b1g1r1:
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,11,9)
case PIXMAN_a2b10g10r10:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,14,1)
case PIXMAN_b8g8r8a8:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,15,16)
case PIXMAN_a2r10g10b10:
#endif
return CAIRO_CONTENT_COLOR_ALPHA;
case PIXMAN_x8r8g8b8:
case PIXMAN_x8b8g8r8:
case PIXMAN_r8g8b8:
case PIXMAN_b8g8r8:
case PIXMAN_r5g6b5:
case PIXMAN_b5g6r5:
case PIXMAN_x1r5g5b5:
case PIXMAN_x1b5g5r5:
case PIXMAN_x4r4g4b4:
case PIXMAN_x4b4g4r4:
case PIXMAN_r3g3b2:
case PIXMAN_b2g3r3:
case PIXMAN_c8:
case PIXMAN_g8:
case PIXMAN_r1g2b1:
case PIXMAN_b1g2r1:
case PIXMAN_c4:
case PIXMAN_g4:
case PIXMAN_g1:
case PIXMAN_yuy2:
case PIXMAN_yv12:
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,11,9)
case PIXMAN_x2b10g10r10:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,14,1)
case PIXMAN_b8g8r8x8:
#endif
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,15,16)
case PIXMAN_x2r10g10b10:
#endif
return CAIRO_CONTENT_COLOR;
case PIXMAN_a8:
case PIXMAN_a1:
case PIXMAN_x4a4:
case PIXMAN_a4:
return CAIRO_CONTENT_ALPHA;
}
return CAIRO_CONTENT_COLOR_ALPHA;
}
cairo_surface_t *
_cairo_image_surface_create_for_pixman_image (pixman_image_t *pixman_image,
pixman_format_code_t pixman_format)
{
cairo_image_surface_t *surface;
int width = pixman_image_get_width (pixman_image);
int height = pixman_image_get_height (pixman_image);
if (! _cairo_image_surface_is_size_valid (width, height)) {
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
}
surface = malloc (sizeof (cairo_image_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
_cairo_surface_init (&surface->base,
&_cairo_image_surface_backend,
NULL, /* device */
_cairo_content_from_pixman_format (pixman_format));
surface->pixman_image = pixman_image;
surface->pixman_format = pixman_format;
surface->format = _cairo_format_from_pixman_format (pixman_format);
surface->data = (unsigned char *) pixman_image_get_data (pixman_image);
surface->owns_data = FALSE;
surface->transparency = CAIRO_IMAGE_UNKNOWN;
surface->width = width;
surface->height = height;
surface->stride = pixman_image_get_stride (pixman_image);
surface->depth = pixman_image_get_depth (pixman_image);
surface->clip_region = NULL;
return &surface->base;
}
cairo_bool_t
_pixman_format_from_masks (cairo_format_masks_t *masks,
pixman_format_code_t *format_ret)
{
pixman_format_code_t format;
int format_type;
int a, r, g, b;
cairo_format_masks_t format_masks;
a = _cairo_popcount (masks->alpha_mask);
r = _cairo_popcount (masks->red_mask);
g = _cairo_popcount (masks->green_mask);
b = _cairo_popcount (masks->blue_mask);
if (masks->red_mask) {
if (masks->red_mask > masks->blue_mask)
format_type = PIXMAN_TYPE_ARGB;
else
format_type = PIXMAN_TYPE_ABGR;
} else if (masks->alpha_mask) {
format_type = PIXMAN_TYPE_A;
} else {
return FALSE;
}
format = PIXMAN_FORMAT (masks->bpp, format_type, a, r, g, b);
if (! pixman_format_supported_destination (format))
return FALSE;
/* Sanity check that we got out of PIXMAN_FORMAT exactly what we
* expected. This avoid any problems from something bizarre like
* alpha in the least-significant bits, or insane channel order,
* or whatever. */
if (!_pixman_format_to_masks (format, &format_masks) ||
masks->bpp != format_masks.bpp ||
masks->red_mask != format_masks.red_mask ||
masks->green_mask != format_masks.green_mask ||
masks->blue_mask != format_masks.blue_mask)
{
return FALSE;
}
*format_ret = format;
return TRUE;
}
/* A mask consisting of N bits set to 1. */
#define MASK(N) ((1UL << (N))-1)
cairo_bool_t
_pixman_format_to_masks (pixman_format_code_t format,
cairo_format_masks_t *masks)
{
int a, r, g, b;
masks->bpp = PIXMAN_FORMAT_BPP (format);
/* Number of bits in each channel */
a = PIXMAN_FORMAT_A (format);
r = PIXMAN_FORMAT_R (format);
g = PIXMAN_FORMAT_G (format);
b = PIXMAN_FORMAT_B (format);
switch (PIXMAN_FORMAT_TYPE (format)) {
case PIXMAN_TYPE_ARGB:
masks->alpha_mask = MASK (a) << (r + g + b);
masks->red_mask = MASK (r) << (g + b);
masks->green_mask = MASK (g) << (b);
masks->blue_mask = MASK (b);
return TRUE;
case PIXMAN_TYPE_ABGR:
masks->alpha_mask = MASK (a) << (b + g + r);
masks->blue_mask = MASK (b) << (g + r);
masks->green_mask = MASK (g) << (r);
masks->red_mask = MASK (r);
return TRUE;
#ifdef PIXMAN_TYPE_BGRA
case PIXMAN_TYPE_BGRA:
masks->blue_mask = MASK (b) << (masks->bpp - b);
masks->green_mask = MASK (g) << (masks->bpp - b - g);
masks->red_mask = MASK (r) << (masks->bpp - b - g - r);
masks->alpha_mask = MASK (a);
return TRUE;
#endif
case PIXMAN_TYPE_A:
masks->alpha_mask = MASK (a);
masks->red_mask = 0;
masks->green_mask = 0;
masks->blue_mask = 0;
return TRUE;
case PIXMAN_TYPE_OTHER:
case PIXMAN_TYPE_COLOR:
case PIXMAN_TYPE_GRAY:
case PIXMAN_TYPE_YUY2:
case PIXMAN_TYPE_YV12:
default:
masks->alpha_mask = 0;
masks->red_mask = 0;
masks->green_mask = 0;
masks->blue_mask = 0;
return FALSE;
}
}
/* XXX: This function really should be eliminated. We don't really
* want to advertise a cairo image surface that supports any possible
* format. A minimal step would be to replace this function with one
* that accepts a #cairo_internal_format_t rather than mask values. */
cairo_surface_t *
_cairo_image_surface_create_with_masks (unsigned char *data,
cairo_format_masks_t *masks,
int width,
int height,
int stride)
{
pixman_format_code_t pixman_format;
if (! _pixman_format_from_masks (masks, &pixman_format)) {
fprintf (stderr,
"Error: Cairo %s does not yet support the requested image format:\n"
"\tDepth: %d\n"
"\tAlpha mask: 0x%08lx\n"
"\tRed mask: 0x%08lx\n"
"\tGreen mask: 0x%08lx\n"
"\tBlue mask: 0x%08lx\n"
#ifdef PACKAGE_BUGGREPORT
"Please file an enhancement request (quoting the above) at:\n"
PACKAGE_BUGREPORT"\n"
#endif
,
cairo_version_string (),
masks->bpp, masks->alpha_mask,
masks->red_mask, masks->green_mask, masks->blue_mask);
ASSERT_NOT_REACHED;
}
return _cairo_image_surface_create_with_pixman_format (data,
pixman_format,
width,
height,
stride);
}
static pixman_format_code_t
_cairo_format_to_pixman_format_code (cairo_format_t format)
{
pixman_format_code_t ret;
switch (format) {
case CAIRO_FORMAT_A1:
ret = PIXMAN_a1;
break;
case CAIRO_FORMAT_A8:
ret = PIXMAN_a8;
break;
case CAIRO_FORMAT_RGB24:
ret = PIXMAN_x8r8g8b8;
break;
case CAIRO_FORMAT_ARGB32:
default:
ret = PIXMAN_a8r8g8b8;
break;
}
return ret;
}
cairo_surface_t *
_cairo_image_surface_create_with_pixman_format (unsigned char *data,
pixman_format_code_t pixman_format,
int width,
int height,
int stride)
{
cairo_surface_t *surface;
pixman_image_t *pixman_image;
if (! _cairo_image_surface_is_size_valid (width, height))
{
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
}
pixman_image = pixman_image_create_bits (pixman_format, width, height,
(uint32_t *) data, stride);
if (unlikely (pixman_image == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
surface = _cairo_image_surface_create_for_pixman_image (pixman_image,
pixman_format);
if (unlikely (surface->status)) {
pixman_image_unref (pixman_image);
return surface;
}
/* we can not make any assumptions about the initial state of user data */
surface->is_clear = data == NULL;
return surface;
}
/**
* cairo_image_surface_create:
* @format: format of pixels in the surface to create
* @width: width of the surface, in pixels
* @height: height of the surface, in pixels
*
* Creates an image surface of the specified format and
* dimensions. Initially the surface contents are all
* 0. (Specifically, within each pixel, each color or alpha channel
* belonging to format will be 0. The contents of bits within a pixel,
* but not belonging to the given format are undefined).
*
* 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_image_surface_create (cairo_format_t format,
int width,
int height)
{
pixman_format_code_t pixman_format;
if (! CAIRO_FORMAT_VALID (format))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_FORMAT));
pixman_format = _cairo_format_to_pixman_format_code (format);
return _cairo_image_surface_create_with_pixman_format (NULL, pixman_format,
width, height, -1);
}
slim_hidden_def (cairo_image_surface_create);
cairo_surface_t *
_cairo_image_surface_create_with_content (cairo_content_t content,
int width,
int height)
{
if (! CAIRO_CONTENT_VALID (content))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));
return cairo_image_surface_create (_cairo_format_from_content (content),
width, height);
}
/**
* cairo_format_stride_for_width:
* @format: A #cairo_format_t value
* @width: The desired width of an image surface to be created.
*
* This function provides a stride value that will respect all
* alignment requirements of the accelerated image-rendering code
* within cairo. Typical usage will be of the form:
*
* <informalexample><programlisting>
* int stride;
* unsigned char *data;
* #cairo_surface_t *surface;
*
* stride = cairo_format_stride_for_width (format, width);
* data = malloc (stride * height);
* surface = cairo_image_surface_create_for_data (data, format,
* width, height,
* stride);
* </programlisting></informalexample>
*
* Return value: the appropriate stride to use given the desired
* format and width, or -1 if either the format is invalid or the width
* too large.
*
* Since: 1.6
**/
int
cairo_format_stride_for_width (cairo_format_t format,
int width)
{
int bpp;
if (! CAIRO_FORMAT_VALID (format)) {
_cairo_error_throw (CAIRO_STATUS_INVALID_FORMAT);
return -1;
}
bpp = _cairo_format_bits_per_pixel (format);
if ((unsigned) (width) >= (INT32_MAX - 7) / (unsigned) (bpp))
return -1;
return CAIRO_STRIDE_FOR_WIDTH_BPP (width, bpp);
}
slim_hidden_def (cairo_format_stride_for_width);
/**
* cairo_image_surface_create_for_data:
* @data: a pointer to a buffer supplied by the application in which
* to write contents. This pointer must be suitably aligned for any
* kind of variable, (for example, a pointer returned by malloc).
* @format: the format of pixels in the buffer
* @width: the width of the image to be stored in the buffer
* @height: the height of the image to be stored in the buffer
* @stride: the number of bytes between the start of rows in the
* buffer as allocated. This value should always be computed by
* cairo_format_stride_for_width() before allocating the data
* buffer.
*
* Creates an image surface for the provided pixel data. The output
* buffer must be kept around until the #cairo_surface_t is destroyed
* or cairo_surface_finish() is called on the surface. The initial
* contents of @data will be used as the initial image contents; you
* must explicitly clear the buffer, using, for example,
* cairo_rectangle() and cairo_fill() if you want it cleared.
*
* Note that the stride may be larger than
* width*bytes_per_pixel to provide proper alignment for each pixel
* and row. This alignment is required to allow high-performance rendering
* within cairo. The correct way to obtain a legal stride value is to
* call cairo_format_stride_for_width() with the desired format and
* maximum image width value, and then use the resulting stride value
* to allocate the data and to create the image surface. See
* cairo_format_stride_for_width() for example code.
*
* 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 in the case of an error such as out of
* memory or an invalid stride value. In case of invalid stride value
* the error status of the returned surface will be
* %CAIRO_STATUS_INVALID_STRIDE. You can use
* cairo_surface_status() to check for this.
*
* See cairo_surface_set_user_data() for a means of attaching a
* destroy-notification fallback to the surface if necessary.
**/
cairo_surface_t *
cairo_image_surface_create_for_data (unsigned char *data,
cairo_format_t format,
int width,
int height,
int stride)
{
pixman_format_code_t pixman_format;
int minstride;
if (! CAIRO_FORMAT_VALID (format))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_FORMAT));
if ((stride & (CAIRO_STRIDE_ALIGNMENT-1)) != 0)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_STRIDE));
minstride = cairo_format_stride_for_width (format, width);
if (stride < 0) {
if (stride > -minstride) {
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_STRIDE));
}
} else {
if (stride < minstride) {
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_STRIDE));
}
}
pixman_format = _cairo_format_to_pixman_format_code (format);
return _cairo_image_surface_create_with_pixman_format (data,
pixman_format,
width, height,
stride);
}
slim_hidden_def (cairo_image_surface_create_for_data);
cairo_surface_t *
_cairo_image_surface_create_for_data_with_content (unsigned char *data,
cairo_content_t content,
int width,
int height,
int stride)
{
if (! CAIRO_CONTENT_VALID (content))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));
return cairo_image_surface_create_for_data (data,
_cairo_format_from_content (content),
width, height, stride);
}
/**
* cairo_image_surface_get_data:
* @surface: a #cairo_image_surface_t
*
* Get a pointer to the data of the image surface, for direct
* inspection or modification.
*
* Return value: a pointer to the image data of this surface or %NULL
* if @surface is not an image surface, or if cairo_surface_finish()
* has been called.
*
* Since: 1.2
**/
unsigned char *
cairo_image_surface_get_data (cairo_surface_t *surface)
{
cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
if (! _cairo_surface_is_image (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return NULL;
}
return image_surface->data;
}
slim_hidden_def (cairo_image_surface_get_data);
/**
* cairo_image_surface_get_format:
* @surface: a #cairo_image_surface_t
*
* Get the format of the surface.
*
* Return value: the format of the surface
*
* Since: 1.2
**/
cairo_format_t
cairo_image_surface_get_format (cairo_surface_t *surface)
{
cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
if (! _cairo_surface_is_image (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return CAIRO_FORMAT_INVALID;
}
return image_surface->format;
}
slim_hidden_def (cairo_image_surface_get_format);
/**
* cairo_image_surface_get_width:
* @surface: a #cairo_image_surface_t
*
* Get the width of the image surface in pixels.
*
* Return value: the width of the surface in pixels.
**/
int
cairo_image_surface_get_width (cairo_surface_t *surface)
{
cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
if (! _cairo_surface_is_image (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return image_surface->width;
}
slim_hidden_def (cairo_image_surface_get_width);
/**
* cairo_image_surface_get_height:
* @surface: a #cairo_image_surface_t
*
* Get the height of the image surface in pixels.
*
* Return value: the height of the surface in pixels.
**/
int
cairo_image_surface_get_height (cairo_surface_t *surface)
{
cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
if (! _cairo_surface_is_image (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return image_surface->height;
}
slim_hidden_def (cairo_image_surface_get_height);
/**
* cairo_image_surface_get_stride:
* @surface: a #cairo_image_surface_t
*
* Get the stride of the image surface in bytes
*
* Return value: the stride of the image surface in bytes (or 0 if
* @surface is not an image surface). The stride is the distance in
* bytes from the beginning of one row of the image data to the
* beginning of the next row.
*
* Since: 1.2
**/
int
cairo_image_surface_get_stride (cairo_surface_t *surface)
{
cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
if (! _cairo_surface_is_image (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return image_surface->stride;
}
slim_hidden_def (cairo_image_surface_get_stride);
cairo_format_t
_cairo_format_from_content (cairo_content_t content)
{
switch (content) {
case CAIRO_CONTENT_COLOR:
return CAIRO_FORMAT_RGB24;
case CAIRO_CONTENT_ALPHA:
return CAIRO_FORMAT_A8;
case CAIRO_CONTENT_COLOR_ALPHA:
return CAIRO_FORMAT_ARGB32;
}
ASSERT_NOT_REACHED;
return CAIRO_FORMAT_ARGB32;
}
cairo_content_t
_cairo_content_from_format (cairo_format_t format)
{
switch (format) {
case CAIRO_FORMAT_ARGB32:
return CAIRO_CONTENT_COLOR_ALPHA;
case CAIRO_FORMAT_RGB24:
return CAIRO_CONTENT_COLOR;
case CAIRO_FORMAT_A8:
case CAIRO_FORMAT_A1:
return CAIRO_CONTENT_ALPHA;
}
ASSERT_NOT_REACHED;
return CAIRO_CONTENT_COLOR_ALPHA;
}
int
_cairo_format_bits_per_pixel (cairo_format_t format)
{
switch (format) {
case CAIRO_FORMAT_ARGB32:
return 32;
case CAIRO_FORMAT_RGB24:
return 32;
case CAIRO_FORMAT_A8:
return 8;
case CAIRO_FORMAT_A1:
return 1;
default:
ASSERT_NOT_REACHED;
return 0;
}
}
static cairo_surface_t *
_cairo_image_surface_create_similar (void *abstract_other,
cairo_content_t content,
int width,
int height)
{
cairo_image_surface_t *other = abstract_other;
if (content == other->base.content) {
return _cairo_image_surface_create_with_pixman_format (NULL,
other->pixman_format,
width, height,
0);
}
return _cairo_image_surface_create_with_content (content,
width, height);
}
static cairo_status_t
_cairo_image_surface_finish (void *abstract_surface)
{
cairo_image_surface_t *surface = abstract_surface;
if (surface->pixman_image) {
pixman_image_unref (surface->pixman_image);
surface->pixman_image = NULL;
}
if (surface->owns_data) {
free (surface->data);
surface->data = NULL;
}
cairo_region_destroy (surface->clip_region);
return CAIRO_STATUS_SUCCESS;
}
void
_cairo_image_surface_assume_ownership_of_data (cairo_image_surface_t *surface)
{
surface->owns_data = TRUE;
}
static cairo_status_t
_cairo_image_surface_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **image_extra)
{
*image_out = abstract_surface;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_image_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
}
static cairo_status_t
_cairo_image_surface_acquire_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t **image_out,
cairo_rectangle_int_t *image_rect_out,
void **image_extra)
{
cairo_image_surface_t *surface = abstract_surface;
image_rect_out->x = 0;
image_rect_out->y = 0;
image_rect_out->width = surface->width;
image_rect_out->height = surface->height;
*image_out = surface;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_image_surface_release_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t *image,
cairo_rectangle_int_t *image_rect,
void *image_extra)
{
}
static cairo_status_t
_cairo_image_surface_clone_similar (void *abstract_surface,
cairo_surface_t *src,
int src_x,
int src_y,
int width,
int height,
int *clone_offset_x,
int *clone_offset_y,
cairo_surface_t **clone_out)
{
cairo_image_surface_t *surface = abstract_surface;
if (src->backend == surface->base.backend) {
*clone_offset_x = *clone_offset_y = 0;
*clone_out = cairo_surface_reference (src);
return CAIRO_STATUS_SUCCESS;
}
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_status_t
_cairo_image_surface_set_matrix (cairo_image_surface_t *surface,
const cairo_matrix_t *matrix,
double xc, double yc)
{
pixman_transform_t pixman_transform;
_cairo_matrix_to_pixman_matrix (matrix, &pixman_transform, xc, yc);
if (! pixman_image_set_transform (surface->pixman_image, &pixman_transform))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_image_surface_set_filter (cairo_image_surface_t *surface,
cairo_filter_t filter)
{
pixman_filter_t pixman_filter;
switch (filter) {
case CAIRO_FILTER_FAST:
pixman_filter = PIXMAN_FILTER_FAST;
break;
case CAIRO_FILTER_GOOD:
pixman_filter = PIXMAN_FILTER_GOOD;
break;
case CAIRO_FILTER_BEST:
pixman_filter = PIXMAN_FILTER_BEST;
break;
case CAIRO_FILTER_NEAREST:
pixman_filter = PIXMAN_FILTER_NEAREST;
break;
case CAIRO_FILTER_BILINEAR:
pixman_filter = PIXMAN_FILTER_BILINEAR;
break;
case CAIRO_FILTER_GAUSSIAN:
/* XXX: The GAUSSIAN value has no implementation in cairo
* whatsoever, so it was really a mistake to have it in the
* API. We could fix this by officially deprecating it, or
* else inventing semantics and providing an actual
* implementation for it. */
default:
pixman_filter = PIXMAN_FILTER_BEST;
}
if (! pixman_image_set_filter (surface->pixman_image,
pixman_filter,
NULL, 0))
{
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_image_surface_set_extend (cairo_image_surface_t *surface,
cairo_extend_t extend)
{
pixman_repeat_t pixman_repeat;
switch (extend) {
case CAIRO_EXTEND_NONE:
pixman_repeat = PIXMAN_REPEAT_NONE;
break;
case CAIRO_EXTEND_REPEAT:
pixman_repeat = PIXMAN_REPEAT_NORMAL;
break;
case CAIRO_EXTEND_REFLECT:
pixman_repeat = PIXMAN_REPEAT_REFLECT;
break;
case CAIRO_EXTEND_PAD:
pixman_repeat = PIXMAN_REPEAT_PAD;
break;
}
pixman_image_set_repeat (surface->pixman_image, pixman_repeat);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_image_surface_set_component_alpha (cairo_image_surface_t *surface,
cairo_bool_t ca)
{
pixman_image_set_component_alpha (surface->pixman_image, ca);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_image_surface_set_attributes (cairo_image_surface_t *surface,
cairo_surface_attributes_t *attributes,
double xc, double yc)
{
cairo_int_status_t status;
status = _cairo_image_surface_set_matrix (surface, &attributes->matrix,
xc, yc);
if (unlikely (status))
return status;
status = _cairo_image_surface_set_filter (surface, attributes->filter);
if (unlikely (status))
return status;
status = _cairo_image_surface_set_extend (surface, attributes->extend);
if (unlikely (status))
return status;
status = _cairo_image_surface_set_component_alpha (surface,
attributes->has_component_alpha);
if (unlikely (status))
return status;
return CAIRO_STATUS_SUCCESS;
}
/* XXX: I think we should fix pixman to match the names/order of the
* cairo operators, but that will likely be better done at the same
* time the X server is ported to pixman, (which will change a lot of
* things in pixman I think).
*/
static pixman_op_t
_pixman_operator (cairo_operator_t op)
{
switch (op) {
case CAIRO_OPERATOR_CLEAR:
return PIXMAN_OP_CLEAR;
case CAIRO_OPERATOR_SOURCE:
return PIXMAN_OP_SRC;
case CAIRO_OPERATOR_OVER:
return PIXMAN_OP_OVER;
case CAIRO_OPERATOR_IN:
return PIXMAN_OP_IN;
case CAIRO_OPERATOR_OUT:
return PIXMAN_OP_OUT;
case CAIRO_OPERATOR_ATOP:
return PIXMAN_OP_ATOP;
case CAIRO_OPERATOR_DEST:
return PIXMAN_OP_DST;
case CAIRO_OPERATOR_DEST_OVER:
return PIXMAN_OP_OVER_REVERSE;
case CAIRO_OPERATOR_DEST_IN:
return PIXMAN_OP_IN_REVERSE;
case CAIRO_OPERATOR_DEST_OUT:
return PIXMAN_OP_OUT_REVERSE;
case CAIRO_OPERATOR_DEST_ATOP:
return PIXMAN_OP_ATOP_REVERSE;
case CAIRO_OPERATOR_XOR:
return PIXMAN_OP_XOR;
case CAIRO_OPERATOR_ADD:
return PIXMAN_OP_ADD;
case CAIRO_OPERATOR_SATURATE:
return PIXMAN_OP_SATURATE;
case CAIRO_OPERATOR_MULTIPLY:
return PIXMAN_OP_MULTIPLY;
case CAIRO_OPERATOR_SCREEN:
return PIXMAN_OP_SCREEN;
case CAIRO_OPERATOR_OVERLAY:
return PIXMAN_OP_OVERLAY;
case CAIRO_OPERATOR_DARKEN:
return PIXMAN_OP_DARKEN;
case CAIRO_OPERATOR_LIGHTEN:
return PIXMAN_OP_LIGHTEN;
case CAIRO_OPERATOR_COLOR_DODGE:
return PIXMAN_OP_COLOR_DODGE;
case CAIRO_OPERATOR_COLOR_BURN:
return PIXMAN_OP_COLOR_BURN;
case CAIRO_OPERATOR_HARD_LIGHT:
return PIXMAN_OP_HARD_LIGHT;
case CAIRO_OPERATOR_SOFT_LIGHT:
return PIXMAN_OP_SOFT_LIGHT;
case CAIRO_OPERATOR_DIFFERENCE:
return PIXMAN_OP_DIFFERENCE;
case CAIRO_OPERATOR_EXCLUSION:
return PIXMAN_OP_EXCLUSION;
case CAIRO_OPERATOR_HSL_HUE:
return PIXMAN_OP_HSL_HUE;
case CAIRO_OPERATOR_HSL_SATURATION:
return PIXMAN_OP_HSL_SATURATION;
case CAIRO_OPERATOR_HSL_COLOR:
return PIXMAN_OP_HSL_COLOR;
case CAIRO_OPERATOR_HSL_LUMINOSITY:
return PIXMAN_OP_HSL_LUMINOSITY;
default:
ASSERT_NOT_REACHED;
return PIXMAN_OP_OVER;
}
}
static cairo_status_t
_cairo_image_surface_set_clip_region (cairo_image_surface_t *surface,
cairo_region_t *region)
{
if (region == surface->clip_region)
return CAIRO_STATUS_SUCCESS;
if (cairo_region_equal (surface->clip_region, region))
return CAIRO_STATUS_SUCCESS;
cairo_region_destroy (surface->clip_region);
surface->clip_region = cairo_region_reference (region);
if (! pixman_image_set_clip_region32 (surface->pixman_image,
region ? &region->rgn : NULL))
{
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_image_surface_composite (cairo_operator_t op,
const cairo_pattern_t *src_pattern,
const cairo_pattern_t *mask_pattern,
void *abstract_dst,
int src_x,
int src_y,
int mask_x,
int mask_y,
int dst_x,
int dst_y,
unsigned int width,
unsigned int height,
cairo_region_t *clip_region)
{
cairo_surface_attributes_t src_attr, mask_attr;
cairo_image_surface_t *dst = abstract_dst;
cairo_image_surface_t *src;
cairo_image_surface_t *mask;
cairo_int_status_t status;
status = _cairo_image_surface_set_clip_region (dst, clip_region);
if (unlikely (status))
return status;
status = _cairo_pattern_acquire_surfaces (src_pattern, mask_pattern,
&dst->base,
src_x, src_y,
mask_x, mask_y,
width, height,
CAIRO_PATTERN_ACQUIRE_NONE,
(cairo_surface_t **) &src,
(cairo_surface_t **) &mask,
&src_attr, &mask_attr);
if (unlikely (status))
return status;
status = _cairo_image_surface_set_attributes (src, &src_attr,
dst_x + width / 2.,
dst_y + height / 2.);
if (unlikely (status))
goto CLEANUP_SURFACES;
if (mask) {
status = _cairo_image_surface_set_attributes (mask, &mask_attr,
dst_x + width / 2.,
dst_y + height / 2.);
if (unlikely (status))
goto CLEANUP_SURFACES;
pixman_image_composite (_pixman_operator (op),
src->pixman_image,
mask->pixman_image,
dst->pixman_image,
src_x + src_attr.x_offset,
src_y + src_attr.y_offset,
mask_x + mask_attr.x_offset,
mask_y + mask_attr.y_offset,
dst_x, dst_y,
width, height);
} else {
pixman_image_composite (_pixman_operator (op),
src->pixman_image,
NULL,
dst->pixman_image,
src_x + src_attr.x_offset,
src_y + src_attr.y_offset,
0, 0,
dst_x, dst_y,
width, height);
}
if (! _cairo_operator_bounded_by_source (op)) {
status = _cairo_surface_composite_fixup_unbounded (&dst->base,
&src_attr, src->width, src->height,
mask ? &mask_attr : NULL,
mask ? mask->width : 0,
mask ? mask->height : 0,
src_x, src_y,
mask_x, mask_y,
dst_x, dst_y, width, height,
clip_region);
}
CLEANUP_SURFACES:
if (mask)
_cairo_pattern_release_surface (mask_pattern, &mask->base, &mask_attr);
_cairo_pattern_release_surface (src_pattern, &src->base, &src_attr);
return status;
}
static cairo_int_status_t
_cairo_image_surface_fill_rectangles (void *abstract_surface,
cairo_operator_t op,
const cairo_color_t *color,
cairo_rectangle_int_t *rects,
int num_rects)
{
cairo_image_surface_t *surface = abstract_surface;
pixman_color_t pixman_color;
pixman_rectangle16_t stack_rects[CAIRO_STACK_ARRAY_LENGTH (pixman_rectangle16_t)];
pixman_rectangle16_t *pixman_rects = stack_rects;
int i;
cairo_int_status_t status;
if (CAIRO_INJECT_FAULT ())
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
pixman_color.red = color->red_short;
pixman_color.green = color->green_short;
pixman_color.blue = color->blue_short;
pixman_color.alpha = color->alpha_short;
status = _cairo_image_surface_set_clip_region (surface, NULL);
assert (status == CAIRO_STATUS_SUCCESS);
if (num_rects > ARRAY_LENGTH (stack_rects)) {
pixman_rects = _cairo_malloc_ab (num_rects, sizeof (pixman_rectangle16_t));
if (unlikely (pixman_rects == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
for (i = 0; i < num_rects; i++) {
pixman_rects[i].x = rects[i].x;
pixman_rects[i].y = rects[i].y;
pixman_rects[i].width = rects[i].width;
pixman_rects[i].height = rects[i].height;
}
/* XXX: pixman_fill_region() should be implemented */
status = CAIRO_STATUS_SUCCESS;
if (! pixman_image_fill_rectangles (_pixman_operator (op),
surface->pixman_image,
&pixman_color,
num_rects,
pixman_rects))
{
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
if (pixman_rects != stack_rects)
free (pixman_rects);
return status;
}
static pixman_format_code_t
_pixman_mask_format_from_antialias (cairo_antialias_t antialias)
{
if (antialias == CAIRO_ANTIALIAS_NONE)
return PIXMAN_a1;
return PIXMAN_a8;
}
static void
_pixman_add_trapezoids (pixman_image_t *image,
int dst_x, int dst_y,
const cairo_trapezoid_t *traps,
int num_traps)
{
while (num_traps--) {
pixman_trapezoid_t trap;
trap.top = _cairo_fixed_to_16_16 (traps->top);
trap.bottom = _cairo_fixed_to_16_16 (traps->bottom);
trap.left.p1.x = _cairo_fixed_to_16_16 (traps->left.p1.x);
trap.left.p1.y = _cairo_fixed_to_16_16 (traps->left.p1.y);
trap.left.p2.x = _cairo_fixed_to_16_16 (traps->left.p2.x);
trap.left.p2.y = _cairo_fixed_to_16_16 (traps->left.p2.y);
trap.right.p1.x = _cairo_fixed_to_16_16 (traps->right.p1.x);
trap.right.p1.y = _cairo_fixed_to_16_16 (traps->right.p1.y);
trap.right.p2.x = _cairo_fixed_to_16_16 (traps->right.p2.x);
trap.right.p2.y = _cairo_fixed_to_16_16 (traps->right.p2.y);
pixman_rasterize_trapezoid (image, &trap, -dst_x, -dst_y);
traps++;
}
}
static cairo_int_status_t
_cairo_image_surface_composite_trapezoids (cairo_operator_t op,
const cairo_pattern_t *pattern,
void *abstract_dst,
cairo_antialias_t antialias,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int width,
unsigned int height,
cairo_trapezoid_t *traps,
int num_traps,
cairo_region_t *clip_region)
{
cairo_surface_attributes_t attributes;
cairo_image_surface_t *dst = abstract_dst;
cairo_image_surface_t *src;
cairo_int_status_t status;
pixman_image_t *mask;
if (height == 0 || width == 0)
return CAIRO_STATUS_SUCCESS;
if (CAIRO_INJECT_FAULT ())
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
/* Special case adding trapezoids onto a mask surface; we want to avoid
* creating an intermediate temporary mask unnecessarily.
*
* We make the assumption here that the portion of the trapezoids
* contained within the surface is bounded by [dst_x,dst_y,width,height];
* the Cairo core code passes bounds based on the trapezoid extents.
*
* Currently the check clip_region == NULL is needed for correct
* functioning, since pixman_add_trapezoids() doesn't obey the
* surface clip, which is a libpixman bug , but there's no harm in
* falling through to the general case when the surface is clipped
* since libpixman would have to generate an intermediate mask anyways.
*/
if (op == CAIRO_OPERATOR_ADD &&
clip_region == NULL &&
_cairo_pattern_is_opaque_solid (pattern) &&
dst->base.content == CAIRO_CONTENT_ALPHA &&
antialias != CAIRO_ANTIALIAS_NONE)
{
_pixman_add_trapezoids (dst->pixman_image, 0, 0, traps, num_traps);
return CAIRO_STATUS_SUCCESS;
}
status = _cairo_image_surface_set_clip_region (dst, clip_region);
if (unlikely (status))
return status;
status = _cairo_pattern_acquire_surface (pattern, &dst->base,
src_x, src_y, width, height,
CAIRO_PATTERN_ACQUIRE_NONE,
(cairo_surface_t **) &src,
&attributes);
if (unlikely (status))
return status;
status = _cairo_image_surface_set_attributes (src, &attributes,
dst_x + width / 2.,
dst_y + height / 2.);
if (unlikely (status))
goto CLEANUP_SOURCE;
mask = pixman_image_create_bits (_pixman_mask_format_from_antialias (antialias),
width, height, NULL, 0);
if (unlikely (mask == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto CLEANUP_SOURCE;
}
_pixman_add_trapezoids (mask, dst_x, dst_y, traps, num_traps);
pixman_image_composite (_pixman_operator (op),
src->pixman_image,
mask,
dst->pixman_image,
src_x + attributes.x_offset,
src_y + attributes.y_offset,
0, 0,
dst_x, dst_y,
width, height);
pixman_image_unref (mask);
if (! _cairo_operator_bounded_by_mask (op)) {
status = _cairo_surface_composite_shape_fixup_unbounded (&dst->base,
&attributes,
src->width, src->height,
width, height,
src_x, src_y,
0, 0,
dst_x, dst_y, width, height,
clip_region);
}
CLEANUP_SOURCE:
_cairo_pattern_release_surface (pattern, &src->base, &attributes);
return status;
}
typedef struct _cairo_image_surface_span_renderer {
cairo_span_renderer_t base;
cairo_operator_t op;
const cairo_pattern_t *pattern;
cairo_antialias_t antialias;
uint8_t *mask_data;
uint32_t mask_stride;
cairo_image_surface_t *src;
cairo_surface_attributes_t src_attributes;
cairo_image_surface_t *mask;
cairo_image_surface_t *dst;
cairo_composite_rectangles_t composite_rectangles;
} cairo_image_surface_span_renderer_t;
void
_cairo_image_surface_span_render_row (
int y,
const cairo_half_open_span_t *spans,
unsigned num_spans,
uint8_t *data,
uint32_t stride)
{
uint8_t *row;
unsigned i;
if (num_spans == 0)
return;
row = data + y * stride;
for (i = 0; i < num_spans - 1; i++) {
if (! spans[i].coverage)
continue;
/* We implement setting the most common single pixel wide
* span case to avoid the overhead of a memset call.
* Open coding setting longer spans didn't show a
* noticeable improvement over memset.
*/
if (spans[i+1].x == spans[i].x + 1) {
row[spans[i].x] = spans[i].coverage;
} else {
memset (row + spans[i].x,
spans[i].coverage,
spans[i+1].x - spans[i].x);
}
}
}
static cairo_status_t
_cairo_image_surface_span_renderer_render_rows (
void *abstract_renderer,
int y,
int height,
const cairo_half_open_span_t *spans,
unsigned num_spans)
{
cairo_image_surface_span_renderer_t *renderer = abstract_renderer;
while (height--)
_cairo_image_surface_span_render_row (y++, spans, num_spans, renderer->mask_data, renderer->mask_stride);
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_image_surface_span_renderer_destroy (void *abstract_renderer)
{
cairo_image_surface_span_renderer_t *renderer = abstract_renderer;
if (!renderer) return;
if (renderer->src != NULL) {
_cairo_pattern_release_surface (renderer->pattern,
&renderer->src->base,
&renderer->src_attributes);
}
if (renderer->mask != NULL)
cairo_surface_destroy (&renderer->mask->base);
free (renderer);
}
static cairo_status_t
_cairo_image_surface_span_renderer_finish (void *abstract_renderer)
{
cairo_image_surface_span_renderer_t *renderer = abstract_renderer;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
if (renderer->src == NULL || renderer->mask == NULL)
return CAIRO_STATUS_SUCCESS;
status = cairo_surface_status (&renderer->mask->base);
if (status == CAIRO_STATUS_SUCCESS) {
cairo_composite_rectangles_t *rects = &renderer->composite_rectangles;
cairo_image_surface_t *src = renderer->src;
cairo_image_surface_t *dst = renderer->dst;
cairo_surface_attributes_t *src_attributes = &renderer->src_attributes;
int width = rects->bounded.width;
int height = rects->bounded.height;
pixman_image_composite (_pixman_operator (renderer->op),
src->pixman_image,
renderer->mask->pixman_image,
dst->pixman_image,
rects->bounded.x + src_attributes->x_offset,
rects->bounded.y + src_attributes->y_offset,
0, 0, /* mask.x, mask.y */
rects->bounded.x, rects->bounded.y,
width, height);
if (! rects->is_bounded) {
status = _cairo_surface_composite_shape_fixup_unbounded (
&dst->base,
src_attributes,
src->width, src->height,
width, height,
rects->bounded.x, rects->bounded.y,
0, 0, /* mask.x, mask.y */
rects->bounded.x, rects->bounded.y,
width, height,
dst->clip_region);
}
}
if (status != CAIRO_STATUS_SUCCESS)
return _cairo_span_renderer_set_error (abstract_renderer,
status);
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
_cairo_image_surface_check_span_renderer (cairo_operator_t op,
const cairo_pattern_t *pattern,
void *abstract_dst,
cairo_antialias_t antialias)
{
return TRUE;
(void) op;
(void) pattern;
(void) abstract_dst;
(void) antialias;
}
static cairo_span_renderer_t *
_cairo_image_surface_create_span_renderer (cairo_operator_t op,
const cairo_pattern_t *pattern,
void *abstract_dst,
cairo_antialias_t antialias,
const cairo_composite_rectangles_t *rects,
cairo_region_t *clip_region)
{
cairo_image_surface_t *dst = abstract_dst;
cairo_image_surface_span_renderer_t *renderer = calloc(1, sizeof(*renderer));
cairo_status_t status;
status = _cairo_image_surface_set_clip_region (dst, clip_region);
if (unlikely (status))
return _cairo_span_renderer_create_in_error (status);
if (renderer == NULL)
return _cairo_span_renderer_create_in_error (CAIRO_STATUS_NO_MEMORY);
renderer->base.destroy = _cairo_image_surface_span_renderer_destroy;
renderer->base.finish = _cairo_image_surface_span_renderer_finish;
renderer->base.render_rows = _cairo_image_surface_span_renderer_render_rows;
renderer->op = op;
renderer->pattern = pattern;
renderer->antialias = antialias;
renderer->dst = dst;
renderer->composite_rectangles = *rects;
status = _cairo_pattern_acquire_surface (
renderer->pattern, &renderer->dst->base,
rects->bounded.x, rects->bounded.y,
rects->bounded.width, rects->bounded.height,
CAIRO_PATTERN_ACQUIRE_NONE,
(cairo_surface_t **) &renderer->src,
&renderer->src_attributes);
if (status)
goto unwind;
status = _cairo_image_surface_set_attributes (
renderer->src, &renderer->src_attributes,
rects->bounded.x + rects->bounded.width/2,
rects->bounded.y + rects->bounded.height/2);
if (status)
goto unwind;
/* TODO: support rendering to A1 surfaces (or: go add span
* compositing to pixman.) */
renderer->mask = (cairo_image_surface_t *)
cairo_image_surface_create (CAIRO_FORMAT_A8,
rects->bounded.width,
rects->bounded.height);
status = cairo_surface_status (&renderer->mask->base);
unwind:
if (status != CAIRO_STATUS_SUCCESS) {
_cairo_image_surface_span_renderer_destroy (renderer);
return _cairo_span_renderer_create_in_error (status);
}
renderer->mask_data = renderer->mask->data - rects->bounded.x - rects->bounded.y * renderer->mask->stride;
renderer->mask_stride = renderer->mask->stride;
return &renderer->base;
}
static cairo_bool_t
_cairo_image_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_image_surface_t *surface = abstract_surface;
rectangle->x = 0;
rectangle->y = 0;
rectangle->width = surface->width;
rectangle->height = surface->height;
return TRUE;
}
static void
_cairo_image_surface_get_font_options (void *abstract_surface,
cairo_font_options_t *options)
{
_cairo_font_options_init_default (options);
cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_ON);
}
/**
* _cairo_surface_is_image:
* @surface: a #cairo_surface_t
*
* Checks if a surface is an #cairo_image_surface_t
*
* Return value: %TRUE if the surface is an image surface
**/
cairo_bool_t
_cairo_surface_is_image (const cairo_surface_t *surface)
{
return surface->backend == &_cairo_image_surface_backend;
}
const cairo_surface_backend_t _cairo_image_surface_backend = {
CAIRO_SURFACE_TYPE_IMAGE,
_cairo_image_surface_create_similar,
_cairo_image_surface_finish,
_cairo_image_surface_acquire_source_image,
_cairo_image_surface_release_source_image,
_cairo_image_surface_acquire_dest_image,
_cairo_image_surface_release_dest_image,
_cairo_image_surface_clone_similar,
_cairo_image_surface_composite,
_cairo_image_surface_fill_rectangles,
_cairo_image_surface_composite_trapezoids,
_cairo_image_surface_create_span_renderer,
_cairo_image_surface_check_span_renderer,
NULL, /* copy_page */
NULL, /* show_page */
_cairo_image_surface_get_extents,
NULL, /* old_show_glyphs */
_cairo_image_surface_get_font_options,
NULL, /* flush */
NULL, /* mark dirty */
NULL, /* font_fini */
NULL, /* glyph_fini */
NULL, /* paint */
NULL, /* mask */
NULL, /* stroke */
NULL, /* fill */
NULL, /* show_glyphs */
NULL, /* snapshot */
NULL, /* is_similar */
};
/* A convenience function for when one needs to coerce an image
* surface to an alternate format. */
cairo_image_surface_t *
_cairo_image_surface_coerce (cairo_image_surface_t *surface,
cairo_format_t format)
{
cairo_image_surface_t *clone;
cairo_surface_pattern_t pattern;
cairo_status_t status;
status = surface->base.status;
if (unlikely (status))
return (cairo_image_surface_t *)_cairo_surface_create_in_error (status);
if (surface->format == format)
return (cairo_image_surface_t *)cairo_surface_reference(&surface->base);
clone = (cairo_image_surface_t *)
cairo_image_surface_create (format, surface->width, surface->height);
if (unlikely (clone->base.status))
return clone;
_cairo_pattern_init_for_surface (&pattern, &surface->base);
status = _cairo_surface_paint (&clone->base,
CAIRO_OPERATOR_SOURCE,
&pattern.base,
NULL);
_cairo_pattern_fini (&pattern.base);
if (unlikely (status)) {
cairo_surface_destroy (&clone->base);
return (cairo_image_surface_t *)_cairo_surface_create_in_error (status);
}
clone->base.device_transform =
surface->base.device_transform;
clone->base.device_transform_inverse =
surface->base.device_transform_inverse;
return clone;
}
cairo_image_transparency_t
_cairo_image_analyze_transparency (cairo_image_surface_t *image)
{
int x, y;
if (image->transparency != CAIRO_IMAGE_UNKNOWN)
return image->transparency;
if ((image->base.content & CAIRO_CONTENT_ALPHA) == 0)
return image->transparency = CAIRO_IMAGE_IS_OPAQUE;
if ((image->base.content & CAIRO_CONTENT_COLOR) == 0) {
if (image->format == CAIRO_FORMAT_A1)
return image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
else
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
}
if (image->format != CAIRO_FORMAT_ARGB32)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
image->transparency = CAIRO_IMAGE_IS_OPAQUE;
for (y = 0; y < image->height; y++) {
uint32_t *pixel = (uint32_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel++) {
int a = (*pixel & 0xff000000) >> 24;
if (a > 0 && a < 255) {
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
} else if (a == 0) {
image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
}
}
}
return image->transparency;
}
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