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cairo/src/cairo-image-surface.c
Chris Wilson af9fbd176b Introduce a new compositor architecture 
Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)
2011-09-12 08:29:48 +01:00

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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
* Copyright © 2009,2010,2011 Intel Corporation
*
* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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>
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairoint.h"
#include "cairo-boxes-private.h"
#include "cairo-clip-private.h"
#include "cairo-composite-rectangles-private.h"
#include "cairo-compositor-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-paginated-private.h"
#include "cairo-pattern-private.h"
#include "cairo-recording-surface-private.h"
#include "cairo-region-private.h"
#include "cairo-scaled-font-private.h"
#include "cairo-surface-snapshot-private.h"
#include "cairo-surface-subsurface-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
/**
* SECTION:cairo-image
* @Title: Image Surfaces
* @Short_Description: Rendering to memory buffers
* @See_Also: #cairo_surface_t
*
* Image surfaces provide the ability to render to memory buffers
* either allocated by cairo or by the calling code. The supported
* image formats are those defined in #cairo_format_t.
*/
/**
* CAIRO_HAS_IMAGE_SURFACE:
*
* Defined if the image surface backend is available.
* The image surface backend is always built in.
* This macro was added for completeness in cairo 1.8.
*
* @Since: 1.8
*/
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;
}
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_x2r10g10b10:
return CAIRO_FORMAT_RGB30;
case PIXMAN_x8r8g8b8:
return CAIRO_FORMAT_RGB24;
case PIXMAN_a8:
return CAIRO_FORMAT_A8;
case PIXMAN_a1:
return CAIRO_FORMAT_A1;
case PIXMAN_r5g6b5:
return CAIRO_FORMAT_RGB16_565;
case PIXMAN_r8g8b8a8: case PIXMAN_r8g8b8x8:
case PIXMAN_a8b8g8r8: case PIXMAN_x8b8g8r8: case PIXMAN_r8g8b8:
case PIXMAN_b8g8r8: 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:
case PIXMAN_b8g8r8x8:
case PIXMAN_b8g8r8a8:
case PIXMAN_a2b10g10r10:
case PIXMAN_x2b10g10r10:
case PIXMAN_a2r10g10b10:
case PIXMAN_x14r6g6b6:
default:
return CAIRO_FORMAT_INVALID;
}
return CAIRO_FORMAT_INVALID;
}
cairo_content_t
_cairo_content_from_pixman_format (pixman_format_code_t pixman_format)
{
cairo_content_t content;
content = 0;
if (PIXMAN_FORMAT_RGB (pixman_format))
content |= CAIRO_CONTENT_COLOR;
if (PIXMAN_FORMAT_A (pixman_format))
content |= CAIRO_CONTENT_ALPHA;
return content;
}
void
_cairo_image_surface_init (cairo_image_surface_t *surface,
pixman_image_t *pixman_image,
pixman_format_code_t pixman_format)
{
surface->pixman_image = pixman_image;
surface->pixman_format = pixman_format;
surface->format = _cairo_format_from_pixman_format (pixman_format);
surface->data = (uint8_t *) pixman_image_get_data (pixman_image);
surface->owns_data = FALSE;
surface->transparency = CAIRO_IMAGE_UNKNOWN;
surface->color = CAIRO_IMAGE_UNKNOWN_COLOR;
surface->width = pixman_image_get_width (pixman_image);
surface->height = pixman_image_get_height (pixman_image);
surface->stride = pixman_image_get_stride (pixman_image);
surface->depth = pixman_image_get_depth (pixman_image);
surface->base.is_clear = surface->width == 0 || surface->height == 0;
surface->compositor = _cairo_image_spans_compositor_get ();
}
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;
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));
_cairo_image_surface_init (surface, pixman_image, pixman_format);
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;
}
}
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_RGB30:
ret = PIXMAN_x2r10g10b10;
break;
case CAIRO_FORMAT_RGB16_565:
ret = PIXMAN_r5g6b5;
break;
case CAIRO_FORMAT_ARGB32:
case CAIRO_FORMAT_INVALID:
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)
{
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));
if (! _cairo_image_surface_is_size_valid (width, height))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
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_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.
*
* A call to cairo_surface_flush() is required before accessing the
* pixel data to ensure that all pending drawing operations are
* finished. A call to cairo_surface_mark_dirty() is required after
* the data is modified.
*
* 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_INVALID;
}
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_RGB30:
return CAIRO_CONTENT_COLOR;
case CAIRO_FORMAT_RGB24:
return CAIRO_CONTENT_COLOR;
case CAIRO_FORMAT_RGB16_565:
return CAIRO_CONTENT_COLOR;
case CAIRO_FORMAT_A8:
case CAIRO_FORMAT_A1:
return CAIRO_CONTENT_ALPHA;
case CAIRO_FORMAT_INVALID:
break;
}
ASSERT_NOT_REACHED;
return CAIRO_CONTENT_COLOR_ALPHA;
}
int
_cairo_format_bits_per_pixel (cairo_format_t format)
{
switch (format) {
case CAIRO_FORMAT_ARGB32:
case CAIRO_FORMAT_RGB30:
case CAIRO_FORMAT_RGB24:
return 32;
case CAIRO_FORMAT_RGB16_565:
return 16;
case CAIRO_FORMAT_A8:
return 8;
case CAIRO_FORMAT_A1:
return 1;
case CAIRO_FORMAT_INVALID:
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 (! _cairo_image_surface_is_size_valid (width, height))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
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);
}
cairo_surface_t *
_cairo_image_surface_snapshot (void *abstract_surface)
{
cairo_image_surface_t *image = abstract_surface;
cairo_image_surface_t *clone;
clone = (cairo_image_surface_t *)
_cairo_image_surface_create_with_pixman_format (NULL,
image->pixman_format,
image->width,
image->height,
0);
if (unlikely (clone->base.status))
return &clone->base;
if (clone->stride == image->stride) {
memcpy (clone->data, image->data, clone->stride * clone->height);
} else {
pixman_image_composite32 (PIXMAN_OP_SRC,
image->pixman_image, NULL, clone->pixman_image,
0, 0,
0, 0,
0, 0,
image->width, image->height);
}
clone->base.is_clear = FALSE;
return &clone->base;
}
cairo_surface_t *
_cairo_image_surface_map_to_image (void *abstract_other,
const cairo_rectangle_int_t *extents)
{
cairo_image_surface_t *other = abstract_other;
cairo_surface_t *surface;
uint8_t *data;
data = other->data;
data += extents->y * other->stride;
data += extents->x * PIXMAN_FORMAT_BPP (other->pixman_format)/ 8;
surface =
_cairo_image_surface_create_with_pixman_format (data,
other->pixman_format,
extents->width,
extents->height,
other->stride);
cairo_surface_set_device_offset (surface, -extents->x, -extents->y);
return surface;
}
cairo_int_status_t
_cairo_image_surface_unmap_image (void *abstract_surface,
cairo_image_surface_t *image)
{
return CAIRO_INT_STATUS_SUCCESS;
}
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;
}
return CAIRO_STATUS_SUCCESS;
}
void
_cairo_image_surface_assume_ownership_of_data (cairo_image_surface_t *surface)
{
surface->owns_data = TRUE;
}
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;
}
void
_cairo_image_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
}
/* high level image interface */
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 cairo_int_status_t
_cairo_image_surface_paint (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip)
{
cairo_image_surface_t *surface = abstract_surface;
return _cairo_compositor_paint (surface->compositor,
&surface->base, op, source, clip);
}
static cairo_int_status_t
_cairo_image_surface_mask (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip)
{
cairo_image_surface_t *surface = abstract_surface;
return _cairo_compositor_mask (surface->compositor,
&surface->base, op, source, mask, clip);
}
static cairo_int_status_t
_cairo_image_surface_stroke (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_image_surface_t *surface = abstract_surface;
return _cairo_compositor_stroke (surface->compositor, &surface->base,
op, source, path,
style, ctm, ctm_inverse,
tolerance, antialias, clip);
}
static cairo_int_status_t
_cairo_image_surface_fill (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_image_surface_t *surface = abstract_surface;
return _cairo_compositor_fill (surface->compositor, &surface->base,
op, source, path,
fill_rule, tolerance, antialias,
clip);
}
static cairo_int_status_t
_cairo_image_surface_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
cairo_image_surface_t *surface = abstract_surface;
return _cairo_compositor_glyphs (surface->compositor, &surface->base,
op, source,
glyphs, num_glyphs, scaled_font,
clip);
}
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_font_options_set_round_glyph_positions (options, CAIRO_ROUND_GLYPH_POS_ON);
}
const cairo_surface_backend_t _cairo_image_surface_backend = {
CAIRO_SURFACE_TYPE_IMAGE,
_cairo_image_surface_finish,
_cairo_default_context_create,
_cairo_image_surface_create_similar,
NULL, /* create similar image */
_cairo_image_surface_map_to_image,
_cairo_image_surface_unmap_image,
_cairo_image_surface_acquire_source_image,
_cairo_image_surface_release_source_image,
_cairo_image_surface_snapshot,
NULL, /* copy_page */
NULL, /* show_page */
_cairo_image_surface_get_extents,
_cairo_image_surface_get_font_options,
NULL, /* flush */
NULL, /* mark dirty */
_cairo_image_surface_paint,
_cairo_image_surface_mask,
_cairo_image_surface_stroke,
_cairo_image_surface_fill,
NULL, /* fill-stroke */
_cairo_image_surface_glyphs,
};
/* 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)
{
return _cairo_image_surface_coerce_to_format (surface,
_cairo_format_from_content (surface->base.content));
}
/* A convenience function for when one needs to coerce an image
* surface to an alternate format. */
cairo_image_surface_t *
_cairo_image_surface_coerce_to_format (cairo_image_surface_t *surface,
cairo_format_t format)
{
cairo_image_surface_t *clone;
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;
pixman_image_composite32 (PIXMAN_OP_SRC,
surface->pixman_image, NULL, clone->pixman_image,
0, 0,
0, 0,
0, 0,
surface->width, surface->height);
clone->base.is_clear = FALSE;
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.is_clear)
return image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
if ((image->base.content & CAIRO_CONTENT_COLOR) == 0) {
if (image->format == CAIRO_FORMAT_A1) {
return image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
} else if (image->format == CAIRO_FORMAT_A8) {
for (y = 0; y < image->height; y++) {
uint8_t *alpha = (uint8_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, alpha++) {
if (*alpha > 0 && *alpha < 255)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
}
}
return image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
} else {
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
}
}
if (image->format == CAIRO_FORMAT_RGB16_565) {
image->transparency = CAIRO_IMAGE_IS_OPAQUE;
return CAIRO_IMAGE_IS_OPAQUE;
}
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;
}
cairo_image_color_t
_cairo_image_analyze_color (cairo_image_surface_t *image)
{
int x, y;
if (image->color != CAIRO_IMAGE_UNKNOWN_COLOR)
return image->color;
if (image->format == CAIRO_FORMAT_A1 || image->format == CAIRO_FORMAT_A8)
return image->color = CAIRO_IMAGE_IS_MONOCHROME;
if (image->format == CAIRO_FORMAT_ARGB32) {
image->color = CAIRO_IMAGE_IS_MONOCHROME;
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;
int r = (*pixel & 0x00ff0000) >> 16;
int g = (*pixel & 0x0000ff00) >> 8;
int b = (*pixel & 0x000000ff);
if (a == 0) {
r = g = b = 0;
} else {
r = (r * 255 + a / 2) / a;
g = (g * 255 + a / 2) / a;
b = (b * 255 + a / 2) / a;
}
if (!(r == g && g == b))
return image->color = CAIRO_IMAGE_IS_COLOR;
else if (r > 0 && r < 255)
image->color = CAIRO_IMAGE_IS_GRAYSCALE;
}
}
return image->color;
}
if (image->format == CAIRO_FORMAT_RGB24) {
image->color = CAIRO_IMAGE_IS_MONOCHROME;
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 r = (*pixel & 0x00ff0000) >> 16;
int g = (*pixel & 0x0000ff00) >> 8;
int b = (*pixel & 0x000000ff);
if (!(r == g && g == b))
return image->color = CAIRO_IMAGE_IS_COLOR;
else if (r > 0 && r < 255)
image->color = CAIRO_IMAGE_IS_GRAYSCALE;
}
}
return image->color;
}
return image->color = CAIRO_IMAGE_IS_COLOR;
}
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