/* cairo - a vector graphics library with display and print output
*
* Copyright © 2009 Eric Anholt
* Copyright © 2009 Chris Wilson
* Copyright © 2005,2010 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., 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 Red Hat, Inc.
*
* Contributor(s):
* Benjamin Otte <otte@gnome.org>
* Carl Worth <cworth@cworth.org>
* Chris Wilson <chris@chris-wilson.co.uk>
* Eric Anholt <eric@anholt.net>
*/
#include "cairoint.h"
#include "cairo-gl-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-inline.h"
#include "cairo-surface-backend-private.h"
static const cairo_surface_backend_t _cairo_gl_surface_backend;
static cairo_status_t
_cairo_gl_surface_flush (void *abstract_surface, unsigned flags);
static cairo_bool_t _cairo_surface_is_gl (cairo_surface_t *surface)
{
return surface->backend == &_cairo_gl_surface_backend;
}
static cairo_bool_t
_cairo_gl_get_image_format_and_type_gles2 (pixman_format_code_t pixman_format,
GLenum *internal_format, GLenum *format,
GLenum *type, cairo_bool_t *has_alpha,
cairo_bool_t *needs_swap)
{
cairo_bool_t is_little_endian = _cairo_is_little_endian ();
*has_alpha = TRUE;
switch ((int) pixman_format) {
case PIXMAN_a8r8g8b8:
*internal_format = GL_BGRA;
*format = GL_BGRA;
*type = GL_UNSIGNED_BYTE;
*needs_swap = !is_little_endian;
return TRUE;
case PIXMAN_x8r8g8b8:
*internal_format = GL_BGRA;
*format = GL_BGRA;
*type = GL_UNSIGNED_BYTE;
*has_alpha = FALSE;
*needs_swap = !is_little_endian;
return TRUE;
case PIXMAN_a8b8g8r8:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_BYTE;
*needs_swap = !is_little_endian;
return TRUE;
case PIXMAN_x8b8g8r8:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_BYTE;
*has_alpha = FALSE;
*needs_swap = !is_little_endian;
return TRUE;
case PIXMAN_b8g8r8a8:
*internal_format = GL_BGRA;
*format = GL_BGRA;
*type = GL_UNSIGNED_BYTE;
*needs_swap = is_little_endian;
return TRUE;
case PIXMAN_b8g8r8x8:
*internal_format = GL_BGRA;
*format = GL_BGRA;
*type = GL_UNSIGNED_BYTE;
*has_alpha = FALSE;
*needs_swap = is_little_endian;
return TRUE;
case PIXMAN_r8g8b8:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_BYTE;
*needs_swap = is_little_endian;
return TRUE;
case PIXMAN_b8g8r8:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_BYTE;
*needs_swap = !is_little_endian;
return TRUE;
case PIXMAN_r5g6b5:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_SHORT_5_6_5;
*needs_swap = FALSE;
return TRUE;
case PIXMAN_b5g6r5:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_SHORT_5_6_5;
*needs_swap = TRUE;
return TRUE;
case PIXMAN_a1b5g5r5:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_SHORT_5_5_5_1;
*needs_swap = TRUE;
return TRUE;
case PIXMAN_x1b5g5r5:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_SHORT_5_5_5_1;
*has_alpha = FALSE;
*needs_swap = TRUE;
return TRUE;
case PIXMAN_a8:
*internal_format = GL_ALPHA;
*format = GL_ALPHA;
*type = GL_UNSIGNED_BYTE;
*needs_swap = FALSE;
return TRUE;
default:
return FALSE;
}
}
static cairo_bool_t
_cairo_gl_get_image_format_and_type_gl (pixman_format_code_t pixman_format,
GLenum *internal_format, GLenum *format,
GLenum *type, cairo_bool_t *has_alpha,
cairo_bool_t *needs_swap)
{
*has_alpha = TRUE;
*needs_swap = FALSE;
switch (pixman_format) {
case PIXMAN_a8r8g8b8:
*internal_format = GL_RGBA;
*format = GL_BGRA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
return TRUE;
case PIXMAN_x8r8g8b8:
*internal_format = GL_RGB;
*format = GL_BGRA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
*has_alpha = FALSE;
return TRUE;
case PIXMAN_a8b8g8r8:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
return TRUE;
case PIXMAN_x8b8g8r8:
*internal_format = GL_RGB;
*format = GL_RGBA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
*has_alpha = FALSE;
return TRUE;
case PIXMAN_b8g8r8a8:
*internal_format = GL_RGBA;
*format = GL_BGRA;
*type = GL_UNSIGNED_INT_8_8_8_8;
return TRUE;
case PIXMAN_b8g8r8x8:
*internal_format = GL_RGB;
*format = GL_BGRA;
*type = GL_UNSIGNED_INT_8_8_8_8;
*has_alpha = FALSE;
return TRUE;
case PIXMAN_r8g8b8:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_BYTE;
return TRUE;
case PIXMAN_b8g8r8:
*internal_format = GL_RGB;
*format = GL_BGR;
*type = GL_UNSIGNED_BYTE;
return TRUE;
case PIXMAN_r5g6b5:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_SHORT_5_6_5;
return TRUE;
case PIXMAN_b5g6r5:
*internal_format = GL_RGB;
*format = GL_RGB;
*type = GL_UNSIGNED_SHORT_5_6_5_REV;
return TRUE;
case PIXMAN_a1r5g5b5:
*internal_format = GL_RGBA;
*format = GL_BGRA;
*type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
return TRUE;
case PIXMAN_x1r5g5b5:
*internal_format = GL_RGB;
*format = GL_BGRA;
*type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
*has_alpha = FALSE;
return TRUE;
case PIXMAN_a1b5g5r5:
*internal_format = GL_RGBA;
*format = GL_RGBA;
*type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
return TRUE;
case PIXMAN_x1b5g5r5:
*internal_format = GL_RGB;
*format = GL_RGBA;
*type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
*has_alpha = FALSE;
return TRUE;
case PIXMAN_a8:
*internal_format = GL_ALPHA;
*format = GL_ALPHA;
*type = GL_UNSIGNED_BYTE;
return TRUE;
#if PIXMAN_VERSION >= PIXMAN_VERSION_ENCODE(0,27,2)
case PIXMAN_a8r8g8b8_sRGB:
#endif
case PIXMAN_a2b10g10r10:
case PIXMAN_x2b10g10r10:
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_x4a4:
/* case PIXMAN_x4c4: */
case PIXMAN_x4g4:
case PIXMAN_a4:
case PIXMAN_r1g2b1:
case PIXMAN_b1g2r1:
case PIXMAN_a1r1g1b1:
case PIXMAN_a1b1g1r1:
case PIXMAN_c4:
case PIXMAN_g4:
case PIXMAN_a1:
case PIXMAN_g1:
case PIXMAN_yuy2:
case PIXMAN_yv12:
case PIXMAN_x2r10g10b10:
case PIXMAN_a2r10g10b10:
case PIXMAN_r8g8b8x8:
case PIXMAN_r8g8b8a8:
case PIXMAN_x14r6g6b6:
default:
return FALSE;
}
}
/*
* Extracts pixel data from an image surface.
*/
static cairo_status_t
_cairo_gl_surface_extract_image_data (cairo_image_surface_t *image,
int x, int y,
int width, int height,
void **output)
{
int cpp = PIXMAN_FORMAT_BPP (image->pixman_format) / 8;
char *data = _cairo_malloc_ab (width * height, cpp);
char *dst = data;
unsigned char *src = image->data + y * image->stride + x * cpp;
int i;
if (unlikely (data == NULL))
return CAIRO_STATUS_NO_MEMORY;
for (i = 0; i < height; i++) {
memcpy (dst, src, width * cpp);
src += image->stride;
dst += width * cpp;
}
*output = data;
return CAIRO_STATUS_SUCCESS;
}
cairo_bool_t
_cairo_gl_get_image_format_and_type (cairo_gl_flavor_t flavor,
pixman_format_code_t pixman_format,
GLenum *internal_format, GLenum *format,
GLenum *type, cairo_bool_t *has_alpha,
cairo_bool_t *needs_swap)
{
if (flavor == CAIRO_GL_FLAVOR_DESKTOP)
return _cairo_gl_get_image_format_and_type_gl (pixman_format,
internal_format, format,
type, has_alpha,
needs_swap);
else
return _cairo_gl_get_image_format_and_type_gles2 (pixman_format,
internal_format, format,
type, has_alpha,
needs_swap);
}
cairo_bool_t
_cairo_gl_operator_is_supported (cairo_operator_t op)
{
return op < CAIRO_OPERATOR_SATURATE;
}
static void
_cairo_gl_surface_embedded_operand_init (cairo_gl_surface_t *surface)
{
cairo_gl_operand_t *operand = &surface->operand;
cairo_surface_attributes_t *attributes = &operand->texture.attributes;
memset (operand, 0, sizeof (cairo_gl_operand_t));
operand->type = CAIRO_GL_OPERAND_TEXTURE;
operand->texture.surface = surface;
operand->texture.tex = surface->tex;
if (_cairo_gl_device_requires_power_of_two_textures (surface->base.device)) {
cairo_matrix_init_identity (&attributes->matrix);
} else {
cairo_matrix_init_scale (&attributes->matrix,
1.0 / surface->width,
1.0 / surface->height);
}
attributes->extend = CAIRO_EXTEND_NONE;
attributes->filter = CAIRO_FILTER_NEAREST;
}
void
_cairo_gl_surface_init (cairo_device_t *device,
cairo_gl_surface_t *surface,
cairo_content_t content,
int width, int height)
{
assert (width > 0 && height > 0);
_cairo_surface_init (&surface->base,
&_cairo_gl_surface_backend,
device,
content,
FALSE); /* is_vector */
surface->width = width;
surface->height = height;
surface->needs_update = FALSE;
surface->content_in_texture = FALSE;
_cairo_gl_surface_embedded_operand_init (surface);
}
static cairo_bool_t
_cairo_gl_surface_size_valid_for_context (cairo_gl_context_t *ctx,
int width, int height)
{
return width > 0 && height > 0 &&
width <= ctx->max_framebuffer_size &&
height <= ctx->max_framebuffer_size;
}
static cairo_bool_t
_cairo_gl_surface_size_valid (cairo_gl_surface_t *surface,
int width, int height)
{
cairo_gl_context_t *ctx = (cairo_gl_context_t *)surface->base.device;
return _cairo_gl_surface_size_valid_for_context (ctx, width, height);
}
static cairo_surface_t *
_cairo_gl_surface_create_scratch_for_texture (cairo_gl_context_t *ctx,
cairo_content_t content,
GLuint tex,
int width,
int height)
{
cairo_gl_surface_t *surface;
surface = calloc (1, sizeof (cairo_gl_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
surface->tex = tex;
_cairo_gl_surface_init (&ctx->base, surface, content, width, height);
surface->supports_msaa = ctx->supports_msaa;
surface->num_samples = ctx->num_samples;
surface->supports_stencil = TRUE;
/* Create the texture used to store the surface's data. */
_cairo_gl_context_activate (ctx, CAIRO_GL_TEX_TEMP);
glBindTexture (ctx->tex_target, surface->tex);
glTexParameteri (ctx->tex_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (ctx->tex_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
return &surface->base;
}
static cairo_surface_t *
_create_scratch_internal (cairo_gl_context_t *ctx,
cairo_content_t content,
int width,
int height,
cairo_bool_t for_caching)
{
cairo_gl_surface_t *surface;
GLenum format;
GLuint tex;
glGenTextures (1, &tex);
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_scratch_for_texture (ctx, content,
tex, width, height);
if (unlikely (surface->base.status))
return &surface->base;
surface->owns_tex = TRUE;
/* adjust the texture size after setting our real extents */
if (width < 1)
width = 1;
if (height < 1)
height = 1;
switch (content) {
default:
ASSERT_NOT_REACHED;
case CAIRO_CONTENT_COLOR_ALPHA:
format = GL_RGBA;
break;
case CAIRO_CONTENT_ALPHA:
/* When using GL_ALPHA, compositing doesn't work properly, but for
* caching surfaces, we are just uploading pixel data, so it isn't
* an issue. */
if (for_caching)
format = GL_ALPHA;
else
format = GL_RGBA;
break;
case CAIRO_CONTENT_COLOR:
/* GL_RGB is almost what we want here -- sampling 1 alpha when
* texturing, using 1 as destination alpha factor in blending,
* etc. However, when filtering with GL_CLAMP_TO_BORDER, the
* alpha channel of the border color will also be clamped to
* 1, when we actually want the border color we explicitly
* specified. So, we have to store RGBA, and fill the alpha
* channel with 1 when blending.
*/
format = GL_RGBA;
break;
}
glTexImage2D (ctx->tex_target, 0, format, width, height, 0,
format, GL_UNSIGNED_BYTE, NULL);
return &surface->base;
}
cairo_surface_t *
_cairo_gl_surface_create_scratch (cairo_gl_context_t *ctx,
cairo_content_t content,
int width,
int height)
{
return _create_scratch_internal (ctx, content, width, height, FALSE);
}
cairo_surface_t *
_cairo_gl_surface_create_scratch_for_caching (cairo_gl_context_t *ctx,
cairo_content_t content,
int width,
int height)
{
return _create_scratch_internal (ctx, content, width, height, TRUE);
}
static cairo_status_t
_cairo_gl_surface_clear (cairo_gl_surface_t *surface,
const cairo_color_t *color)
{
cairo_gl_context_t *ctx;
cairo_status_t status;
double r, g, b, a;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status))
return status;
_cairo_gl_context_set_destination (ctx, surface, surface->msaa_active);
if (surface->base.content & CAIRO_CONTENT_COLOR) {
r = color->red * color->alpha;
g = color->green * color->alpha;
b = color->blue * color->alpha;
} else {
r = g = b = 0;
}
if (surface->base.content & CAIRO_CONTENT_ALPHA) {
a = color->alpha;
} else {
a = 1.0;
}
glDisable (GL_SCISSOR_TEST);
glClearColor (r, g, b, a);
glClear (GL_COLOR_BUFFER_BIT);
if (a == 0)
surface->base.is_clear = TRUE;
return _cairo_gl_context_release (ctx, status);
}
static cairo_surface_t *
_cairo_gl_surface_create_and_clear_scratch (cairo_gl_context_t *ctx,
cairo_content_t content,
int width,
int height)
{
cairo_gl_surface_t *surface;
cairo_int_status_t status;
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_scratch (ctx, content, width, height);
if (unlikely (surface->base.status))
return &surface->base;
/* Cairo surfaces start out initialized to transparent (black) */
status = _cairo_gl_surface_clear (surface, CAIRO_COLOR_TRANSPARENT);
if (unlikely (status)) {
cairo_surface_destroy (&surface->base);
return _cairo_surface_create_in_error (status);
}
return &surface->base;
}
cairo_surface_t *
cairo_gl_surface_create (cairo_device_t *abstract_device,
cairo_content_t content,
int width,
int height)
{
cairo_gl_context_t *ctx;
cairo_gl_surface_t *surface;
cairo_status_t status;
if (! CAIRO_CONTENT_VALID (content))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));
if (abstract_device == NULL)
return _cairo_image_surface_create_with_content (content, width, height);
if (abstract_device->status)
return _cairo_surface_create_in_error (abstract_device->status);
if (abstract_device->backend->type != CAIRO_DEVICE_TYPE_GL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
status = _cairo_gl_context_acquire (abstract_device, &ctx);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
if (! _cairo_gl_surface_size_valid_for_context (ctx, width, height)) {
status = _cairo_gl_context_release (ctx, status);
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
}
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_and_clear_scratch (ctx, content, width, height);
if (unlikely (surface->base.status)) {
status = _cairo_gl_context_release (ctx, surface->base.status);
cairo_surface_destroy (&surface->base);
return _cairo_surface_create_in_error (status);
}
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status)) {
cairo_surface_destroy (&surface->base);
return _cairo_surface_create_in_error (status);
}
return &surface->base;
}
slim_hidden_def (cairo_gl_surface_create);
/**
* cairo_gl_surface_create_for_texture:
* @content: type of content in the surface
* @tex: name of texture to use for storage of surface pixels
* @width: width of the surface, in pixels
* @height: height of the surface, in pixels
*
* Creates a GL surface for the specified texture with the specified
* content and dimensions. The texture must be kept around until the
* #cairo_surface_t is destroyed or cairo_surface_finish() is called
* on the surface. The initial contents of @tex 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. The format of @tex should be compatible with @content,
* in the sense that it must have the color components required by
* @content.
*
* Return value: a pointer to the newly created surface. The caller
* owns the surface and should call cairo_surface_destroy() when done
* with it.
*
* This function always returns a valid pointer, but it will return a
* pointer to a "nil" surface if an error such as out of memory
* occurs. You can use cairo_surface_status() to check for this.
*
* Since: TBD
**/
cairo_surface_t *
cairo_gl_surface_create_for_texture (cairo_device_t *abstract_device,
cairo_content_t content,
unsigned int tex,
int width,
int height)
{
cairo_gl_context_t *ctx;
cairo_gl_surface_t *surface;
cairo_status_t status;
if (! CAIRO_CONTENT_VALID (content))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_CONTENT));
if (abstract_device == NULL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NULL_POINTER));
if (abstract_device->status)
return _cairo_surface_create_in_error (abstract_device->status);
if (abstract_device->backend->type != CAIRO_DEVICE_TYPE_GL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_DEVICE_TYPE_MISMATCH));
status = _cairo_gl_context_acquire (abstract_device, &ctx);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
if (! _cairo_gl_surface_size_valid_for_context (ctx, width, height)) {
status = _cairo_gl_context_release (ctx, status);
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
}
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_scratch_for_texture (ctx, content,
tex, width, height);
status = _cairo_gl_context_release (ctx, status);
return &surface->base;
}
slim_hidden_def (cairo_gl_surface_create_for_texture);
void
cairo_gl_surface_set_size (cairo_surface_t *abstract_surface,
int width,
int height)
{
cairo_gl_surface_t *surface = (cairo_gl_surface_t *) abstract_surface;
if (unlikely (abstract_surface->status))
return;
if (unlikely (abstract_surface->finished)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return;
}
if (! _cairo_surface_is_gl (abstract_surface) ||
_cairo_gl_surface_is_texture (surface)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
return;
}
if (surface->width != width || surface->height != height) {
surface->needs_update = TRUE;
surface->width = width;
surface->height = height;
}
}
int
cairo_gl_surface_get_width (cairo_surface_t *abstract_surface)
{
cairo_gl_surface_t *surface = (cairo_gl_surface_t *) abstract_surface;
if (! _cairo_surface_is_gl (abstract_surface))
return 0;
return surface->width;
}
int
cairo_gl_surface_get_height (cairo_surface_t *abstract_surface)
{
cairo_gl_surface_t *surface = (cairo_gl_surface_t *) abstract_surface;
if (! _cairo_surface_is_gl (abstract_surface))
return 0;
return surface->height;
}
void
cairo_gl_surface_swapbuffers (cairo_surface_t *abstract_surface)
{
cairo_gl_surface_t *surface = (cairo_gl_surface_t *) abstract_surface;
if (unlikely (abstract_surface->status))
return;
if (unlikely (abstract_surface->finished)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return;
}
if (! _cairo_surface_is_gl (abstract_surface)) {
_cairo_surface_set_error (abstract_surface,
CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return;
}
if (! _cairo_gl_surface_is_texture (surface)) {
cairo_gl_context_t *ctx;
cairo_status_t status;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status))
return;
/* For swapping on EGL, at least, we need a valid context/target. */
_cairo_gl_context_set_destination (ctx, surface, FALSE);
/* And in any case we should flush any pending operations. */
_cairo_gl_composite_flush (ctx);
ctx->swap_buffers (ctx, surface);
status = _cairo_gl_context_release (ctx, status);
if (status)
status = _cairo_surface_set_error (abstract_surface, status);
}
}
static cairo_surface_t *
_cairo_gl_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
cairo_surface_t *surface = abstract_surface;
cairo_gl_context_t *ctx;
cairo_status_t status;
if (! _cairo_gl_surface_size_valid (abstract_surface, width, height))
return _cairo_image_surface_create_with_content (content, width, height);
status = _cairo_gl_context_acquire (surface->device, &ctx);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
surface = _cairo_gl_surface_create_and_clear_scratch (ctx, content, width, height);
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status)) {
cairo_surface_destroy (surface);
return _cairo_surface_create_in_error (status);
}
return surface;
}
static cairo_int_status_t
_cairo_gl_surface_fill_alpha_channel (cairo_gl_surface_t *dst,
cairo_gl_context_t *ctx,
int x, int y,
int width, int height)
{
cairo_gl_composite_t setup;
cairo_status_t status;
_cairo_gl_composite_flush (ctx);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
status = _cairo_gl_composite_init (&setup, CAIRO_OPERATOR_SOURCE,
dst, FALSE);
if (unlikely (status))
goto CLEANUP;
_cairo_gl_composite_set_solid_source (&setup, CAIRO_COLOR_BLACK);
status = _cairo_gl_composite_begin (&setup, &ctx);
if (unlikely (status))
goto CLEANUP;
_cairo_gl_context_emit_rect (ctx, x, y, x + width, y + height);
status = _cairo_gl_context_release (ctx, status);
CLEANUP:
_cairo_gl_composite_fini (&setup);
_cairo_gl_composite_flush (ctx);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
return status;
}
cairo_status_t
_cairo_gl_surface_draw_image (cairo_gl_surface_t *dst,
cairo_image_surface_t *src,
int src_x, int src_y,
int width, int height,
int dst_x, int dst_y,
cairo_bool_t force_flush)
{
GLenum internal_format, format, type;
cairo_bool_t has_alpha, needs_swap;
cairo_image_surface_t *clone = NULL;
cairo_gl_context_t *ctx;
int cpp;
cairo_image_surface_t *rgba_clone = NULL;
cairo_int_status_t status = CAIRO_INT_STATUS_SUCCESS;
status = _cairo_gl_context_acquire (dst->base.device, &ctx);
if (unlikely (status))
return status;
if (_cairo_gl_get_flavor () == CAIRO_GL_FLAVOR_ES3 ||
_cairo_gl_get_flavor () == CAIRO_GL_FLAVOR_ES2) {
pixman_format_code_t pixman_format;
cairo_surface_pattern_t pattern;
cairo_bool_t require_conversion = FALSE;
pixman_format = _cairo_is_little_endian () ? PIXMAN_a8b8g8r8 : PIXMAN_r8g8b8a8;
if (src->base.content != CAIRO_CONTENT_ALPHA) {
if (src->pixman_format != pixman_format)
require_conversion = TRUE;
}
else if (dst->base.content != CAIRO_CONTENT_ALPHA) {
require_conversion = TRUE;
}
else if (src->pixman_format != PIXMAN_a8) {
pixman_format = PIXMAN_a8;
require_conversion = TRUE;
}
if (require_conversion) {
rgba_clone = (cairo_image_surface_t *)
_cairo_image_surface_create_with_pixman_format (NULL,
pixman_format,
src->width,
src->height,
0);
if (unlikely (rgba_clone->base.status))
goto FAIL;
_cairo_pattern_init_for_surface (&pattern, &src->base);
status = _cairo_surface_paint (&rgba_clone->base,
CAIRO_OPERATOR_SOURCE,
&pattern.base, NULL);
_cairo_pattern_fini (&pattern.base);
if (unlikely (status))
goto FAIL;
src = rgba_clone;
}
}
if (! _cairo_gl_get_image_format_and_type (ctx->gl_flavor,
src->pixman_format,
&internal_format,
&format,
&type,
&has_alpha,
&needs_swap))
{
cairo_bool_t is_supported;
clone = _cairo_image_surface_coerce (src);
if (unlikely (status = clone->base.status))
goto FAIL;
is_supported =
_cairo_gl_get_image_format_and_type (ctx->gl_flavor,
clone->pixman_format,
&internal_format,
&format,
&type,
&has_alpha,
&needs_swap);
assert (is_supported);
assert (!needs_swap);
src = clone;
}
cpp = PIXMAN_FORMAT_BPP (src->pixman_format) / 8;
if (force_flush) {
status = _cairo_gl_surface_flush (&dst->base, 0);
if (unlikely (status))
goto FAIL;
}
if (_cairo_gl_surface_is_texture (dst)) {
void *data_start = src->data + src_y * src->stride + src_x * cpp;
void *data_start_gles2 = NULL;
/*
* Due to GL_UNPACK_ROW_LENGTH missing in GLES2 we have to extract the
* image data ourselves in some cases. In particular, we must extract
* the pixels if:
* a. we don't want full-length lines or
* b. the row stride cannot be handled by GL itself using a 4 byte
* alignment constraint
*/
if (src->stride < 0 ||
(ctx->gl_flavor == CAIRO_GL_FLAVOR_ES2 &&
(src->width * cpp < src->stride - 3 ||
width != src->width)))
{
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
status = _cairo_gl_surface_extract_image_data (src, src_x, src_y,
width, height,
&data_start_gles2);
if (unlikely (status))
goto FAIL;
data_start = data_start_gles2;
}
else
{
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP ||
ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3)
glPixelStorei (GL_UNPACK_ROW_LENGTH, src->stride / cpp);
}
/* we must resolve the renderbuffer to texture before we
upload image */
status = _cairo_gl_surface_resolve_multisampling (dst);
if (unlikely (status)) {
free (data_start_gles2);
goto FAIL;
}
_cairo_gl_context_activate (ctx, CAIRO_GL_TEX_TEMP);
glBindTexture (ctx->tex_target, dst->tex);
glTexParameteri (ctx->tex_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (ctx->tex_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexSubImage2D (ctx->tex_target, 0,
dst_x, dst_y, width, height,
format, type, data_start);
free (data_start_gles2);
/* If we just treated some rgb-only data as rgba, then we have to
* go back and fix up the alpha channel where we filled in this
* texture data.
*/
if (!has_alpha) {
_cairo_gl_surface_fill_alpha_channel (dst, ctx,
dst_x, dst_y,
width, height);
}
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3)
dst->content_in_texture = TRUE;
} else {
cairo_surface_t *tmp;
tmp = _cairo_gl_surface_create_scratch (ctx,
dst->base.content,
width, height);
if (unlikely (tmp->status))
goto FAIL;
status = _cairo_gl_surface_draw_image ((cairo_gl_surface_t *) tmp,
src,
src_x, src_y,
width, height,
0, 0, force_flush);
if (status == CAIRO_INT_STATUS_SUCCESS) {
cairo_surface_pattern_t tmp_pattern;
cairo_rectangle_int_t r;
cairo_clip_t *clip;
_cairo_pattern_init_for_surface (&tmp_pattern, tmp);
cairo_matrix_init_translate (&tmp_pattern.base.matrix,
-dst_x, -dst_y);
tmp_pattern.base.filter = CAIRO_FILTER_NEAREST;
tmp_pattern.base.extend = CAIRO_EXTEND_NONE;
r.x = dst_x;
r.y = dst_y;
r.width = width;
r.height = height;
clip = _cairo_clip_intersect_rectangle (NULL, &r);
status = _cairo_surface_paint (&dst->base,
CAIRO_OPERATOR_SOURCE,
&tmp_pattern.base,
clip);
_cairo_clip_destroy (clip);
_cairo_pattern_fini (&tmp_pattern.base);
}
cairo_surface_destroy (tmp);
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3)
dst->content_in_texture = TRUE;
}
FAIL:
status = _cairo_gl_context_release (ctx, status);
if (clone)
cairo_surface_destroy (&clone->base);
if (rgba_clone)
cairo_surface_destroy (&rgba_clone->base);
return status;
}
static int _cairo_gl_surface_flavor (cairo_gl_surface_t *surface)
{
cairo_gl_context_t *ctx = (cairo_gl_context_t *)surface->base.device;
return ctx->gl_flavor;
}
static cairo_status_t
_cairo_gl_surface_finish (void *abstract_surface)
{
cairo_gl_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_gl_context_t *ctx;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status))
return status;
if (ctx->operands[CAIRO_GL_TEX_SOURCE].type == CAIRO_GL_OPERAND_TEXTURE &&
ctx->operands[CAIRO_GL_TEX_SOURCE].texture.surface == surface)
_cairo_gl_context_destroy_operand (ctx, CAIRO_GL_TEX_SOURCE);
if (ctx->operands[CAIRO_GL_TEX_MASK].type == CAIRO_GL_OPERAND_TEXTURE &&
ctx->operands[CAIRO_GL_TEX_MASK].texture.surface == surface)
_cairo_gl_context_destroy_operand (ctx, CAIRO_GL_TEX_MASK);
if (ctx->current_target == surface)
ctx->current_target = NULL;
if (surface->fb)
ctx->dispatch.DeleteFramebuffers (1, &surface->fb);
if (surface->depth_stencil)
ctx->dispatch.DeleteRenderbuffers (1, &surface->depth_stencil);
if (surface->owns_tex)
glDeleteTextures (1, &surface->tex);
if (surface->msaa_depth_stencil)
ctx->dispatch.DeleteRenderbuffers (1, &surface->msaa_depth_stencil);
#if CAIRO_HAS_GL_SURFACE || CAIRO_HAS_GLESV3_SURFACE
if (surface->msaa_fb)
ctx->dispatch.DeleteFramebuffers (1, &surface->msaa_fb);
if (surface->msaa_rb)
ctx->dispatch.DeleteRenderbuffers (1, &surface->msaa_rb);
#endif
_cairo_clip_destroy (surface->clip_on_stencil_buffer);
return _cairo_gl_context_release (ctx, status);
}
static cairo_image_surface_t *
_cairo_gl_surface_map_to_image (void *abstract_surface,
const cairo_rectangle_int_t *extents)
{
cairo_gl_surface_t *surface = abstract_surface;
cairo_image_surface_t *image;
cairo_gl_context_t *ctx;
GLenum format, type;
pixman_format_code_t pixman_format;
unsigned int cpp;
cairo_bool_t flipped, mesa_invert;
cairo_status_t status;
int y;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status)) {
return _cairo_image_surface_create_in_error (status);
}
/* Want to use a switch statement here but the compiler gets whiny. */
if (surface->base.content == CAIRO_CONTENT_COLOR_ALPHA) {
format = GL_BGRA;
pixman_format = PIXMAN_a8r8g8b8;
type = GL_UNSIGNED_INT_8_8_8_8_REV;
cpp = 4;
} else if (surface->base.content == CAIRO_CONTENT_COLOR) {
format = GL_BGRA;
pixman_format = PIXMAN_x8r8g8b8;
type = GL_UNSIGNED_INT_8_8_8_8_REV;
cpp = 4;
} else if (surface->base.content == CAIRO_CONTENT_ALPHA) {
format = GL_ALPHA;
pixman_format = PIXMAN_a8;
type = GL_UNSIGNED_BYTE;
cpp = 1;
} else {
ASSERT_NOT_REACHED;
return NULL;
}
if (_cairo_gl_surface_flavor (surface) == CAIRO_GL_FLAVOR_ES3 ||
_cairo_gl_surface_flavor (surface) == CAIRO_GL_FLAVOR_ES2) {
/* If only RGBA is supported, we must download data in a compatible
* format. This means that pixman will convert the data on the CPU when
* interacting with other image surfaces. For ALPHA, GLES2 does not
* support GL_PACK_ROW_LENGTH anyway, and this makes sure that the
* pixman image that is created has row_stride = row_width * bpp. */
if (surface->base.content == CAIRO_CONTENT_ALPHA || !ctx->can_read_bgra) {
cairo_bool_t little_endian = _cairo_is_little_endian ();
format = GL_RGBA;
if (surface->base.content == CAIRO_CONTENT_COLOR) {
pixman_format = little_endian ?
PIXMAN_x8b8g8r8 : PIXMAN_r8g8b8x8;
} else {
pixman_format = little_endian ?
PIXMAN_a8b8g8r8 : PIXMAN_r8g8b8a8;
}
}
/* GLES2 only supports GL_UNSIGNED_BYTE. */
type = GL_UNSIGNED_BYTE;
cpp = 4;
}
image = (cairo_image_surface_t*)
_cairo_image_surface_create_with_pixman_format (NULL,
pixman_format,
extents->width,
extents->height,
-1);
if (unlikely (image->base.status)) {
status = _cairo_gl_context_release (ctx, status);
return image;
}
cairo_surface_set_device_offset (&image->base, -extents->x, -extents->y);
/* If the original surface has not been modified or
* is clear, we can avoid downloading data. */
if (surface->base.is_clear || surface->base.serial == 0) {
status = _cairo_gl_context_release (ctx, status);
return image;
}
/* This is inefficient, as we'd rather just read the thing without making
* it the destination. But then, this is the fallback path, so let's not
* fall back instead.
*/
_cairo_gl_composite_flush (ctx);
if (ctx->gl_flavor != CAIRO_GL_FLAVOR_ES3) {
_cairo_gl_context_set_destination (ctx, surface, FALSE);
} else {
if (surface->content_in_texture) {
_cairo_gl_ensure_framebuffer (ctx, surface);
ctx->dispatch.BindFramebuffer (GL_FRAMEBUFFER, surface->fb);
} else {
status = _cairo_gl_surface_resolve_multisampling (surface);
if (unlikely (status)) {
status = _cairo_gl_context_release (ctx, status);
cairo_surface_destroy (&image->base);
return _cairo_image_surface_create_in_error (status);
}
}
}
flipped = ! _cairo_gl_surface_is_texture (surface);
mesa_invert = flipped && ctx->has_mesa_pack_invert;
glPixelStorei (GL_PACK_ALIGNMENT, 4);
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP ||
ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3)
glPixelStorei (GL_PACK_ROW_LENGTH, image->stride / cpp);
if (mesa_invert)
glPixelStorei (GL_PACK_INVERT_MESA, 1);
y = extents->y;
if (flipped)
y = surface->height - extents->y - extents->height;
glReadPixels (extents->x, y,
extents->width, extents->height,
format, type, image->data);
if (mesa_invert)
glPixelStorei (GL_PACK_INVERT_MESA, 0);
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status)) {
cairo_surface_destroy (&image->base);
return _cairo_image_surface_create_in_error (status);
}
/* We must invert the image manualy if we lack GL_MESA_pack_invert */
if (flipped && ! mesa_invert) {
uint8_t stack[1024], *row = stack;
uint8_t *top = image->data;
uint8_t *bot = image->data + (image->height-1)*image->stride;
if (image->stride > (int)sizeof(stack)) {
row = malloc (image->stride);
if (unlikely (row == NULL)) {
cairo_surface_destroy (&image->base);
return _cairo_image_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
}
}
while (top < bot) {
memcpy (row, top, image->stride);
memcpy (top, bot, image->stride);
memcpy (bot, row, image->stride);
top += image->stride;
bot -= image->stride;
}
if (row != stack)
free(row);
}
image->base.is_clear = FALSE;
return image;
}
static cairo_surface_t *
_cairo_gl_surface_source (void *abstract_surface,
cairo_rectangle_int_t *extents)
{
cairo_gl_surface_t *surface = abstract_surface;
if (extents) {
extents->x = extents->y = 0;
extents->width = surface->width;
extents->height = surface->height;
}
return &surface->base;
}
static cairo_status_t
_cairo_gl_surface_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **image_extra)
{
cairo_gl_surface_t *surface = abstract_surface;
cairo_rectangle_int_t extents;
*image_extra = NULL;
extents.x = extents.y = 0;
extents.width = surface->width;
extents.height = surface->height;
*image_out = (cairo_image_surface_t *)
_cairo_gl_surface_map_to_image (surface, &extents);
return (*image_out)->base.status;
}
static void
_cairo_gl_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
cairo_surface_destroy (&image->base);
}
static cairo_int_status_t
_cairo_gl_surface_unmap_image (void *abstract_surface,
cairo_image_surface_t *image)
{
cairo_int_status_t status;
status = _cairo_gl_surface_draw_image (abstract_surface, image,
0, 0,
image->width, image->height,
image->base.device_transform_inverse.x0,
image->base.device_transform_inverse.y0,
TRUE);
cairo_surface_finish (&image->base);
cairo_surface_destroy (&image->base);
return status;
}
static cairo_bool_t
_cairo_gl_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_gl_surface_t *surface = abstract_surface;
rectangle->x = 0;
rectangle->y = 0;
rectangle->width = surface->width;
rectangle->height = surface->height;
return TRUE;
}
static cairo_status_t
_cairo_gl_surface_flush (void *abstract_surface, unsigned flags)
{
cairo_gl_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_gl_context_t *ctx;
if (flags)
return CAIRO_STATUS_SUCCESS;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status))
return status;
if ((ctx->operands[CAIRO_GL_TEX_SOURCE].type == CAIRO_GL_OPERAND_TEXTURE &&
ctx->operands[CAIRO_GL_TEX_SOURCE].texture.surface == surface) ||
(ctx->operands[CAIRO_GL_TEX_MASK].type == CAIRO_GL_OPERAND_TEXTURE &&
ctx->operands[CAIRO_GL_TEX_MASK].texture.surface == surface) ||
(ctx->current_target == surface))
_cairo_gl_composite_flush (ctx);
status = _cairo_gl_surface_resolve_multisampling (surface);
return _cairo_gl_context_release (ctx, status);
}
cairo_int_status_t
_cairo_gl_surface_resolve_multisampling (cairo_gl_surface_t *surface)
{
cairo_gl_context_t *ctx;
cairo_int_status_t status;
if (! surface->msaa_active)
return CAIRO_INT_STATUS_SUCCESS;
if (surface->base.device == NULL)
return CAIRO_INT_STATUS_SUCCESS;
/* GLES surfaces do not need explicit resolution. */
if (((cairo_gl_context_t *) surface->base.device)->gl_flavor == CAIRO_GL_FLAVOR_ES2)
return CAIRO_INT_STATUS_SUCCESS;
else if (((cairo_gl_context_t *) surface->base.device)->gl_flavor == CAIRO_GL_FLAVOR_ES3 &&
surface->content_in_texture)
return CAIRO_INT_STATUS_SUCCESS;
if (! _cairo_gl_surface_is_texture (surface))
return CAIRO_INT_STATUS_SUCCESS;
status = _cairo_gl_context_acquire (surface->base.device, &ctx);
if (unlikely (status))
return status;
#if CAIRO_HAS_GLESV3_SURFACE
_cairo_gl_composite_flush (ctx);
ctx->current_target = NULL;
_cairo_gl_context_bind_framebuffer (ctx, surface, FALSE);
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3)
surface->content_in_texture = TRUE;
#elif CAIRO_HAS_GL_SURFACE
ctx->current_target = surface;
_cairo_gl_context_bind_framebuffer (ctx, surface, FALSE);
#else
ctx->current_target = surface;
#endif
status = _cairo_gl_context_release (ctx, status);
return status;
}
static const cairo_compositor_t *
get_compositor (cairo_gl_surface_t *surface)
{
cairo_gl_context_t *ctx = (cairo_gl_context_t *)surface->base.device;
return ctx->compositor;
}
static cairo_int_status_t
_cairo_gl_surface_paint (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip)
{
/* simplify the common case of clearing the surface */
if (clip == NULL) {
if (op == CAIRO_OPERATOR_CLEAR)
return _cairo_gl_surface_clear (surface, CAIRO_COLOR_TRANSPARENT);
else if (source->type == CAIRO_PATTERN_TYPE_SOLID &&
(op == CAIRO_OPERATOR_SOURCE ||
(op == CAIRO_OPERATOR_OVER && _cairo_pattern_is_opaque_solid (source)))) {
return _cairo_gl_surface_clear (surface,
&((cairo_solid_pattern_t *) source)->color);
}
}
return _cairo_compositor_paint (get_compositor (surface), surface,
op, source, clip);
}
static cairo_int_status_t
_cairo_gl_surface_mask (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip)
{
return _cairo_compositor_mask (get_compositor (surface), surface,
op, source, mask, clip);
}
static cairo_int_status_t
_cairo_gl_surface_stroke (void *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)
{
return _cairo_compositor_stroke (get_compositor (surface), surface,
op, source, path, style,
ctm, ctm_inverse, tolerance, antialias,
clip);
}
static cairo_int_status_t
_cairo_gl_surface_fill (void *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)
{
return _cairo_compositor_fill (get_compositor (surface), surface,
op, source, path,
fill_rule, tolerance, antialias,
clip);
}
static cairo_int_status_t
_cairo_gl_surface_glyphs (void *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *font,
const cairo_clip_t *clip)
{
return _cairo_compositor_glyphs (get_compositor (surface), surface,
op, source, glyphs, num_glyphs, font,
clip);
}
static const cairo_surface_backend_t _cairo_gl_surface_backend = {
CAIRO_SURFACE_TYPE_GL,
_cairo_gl_surface_finish,
_cairo_default_context_create,
_cairo_gl_surface_create_similar,
NULL, /* similar image */
_cairo_gl_surface_map_to_image,
_cairo_gl_surface_unmap_image,
_cairo_gl_surface_source,
_cairo_gl_surface_acquire_source_image,
_cairo_gl_surface_release_source_image,
NULL, /* snapshot */
NULL, /* copy_page */
NULL, /* show_page */
_cairo_gl_surface_get_extents,
_cairo_image_surface_get_font_options,
_cairo_gl_surface_flush,
NULL, /* mark_dirty_rectangle */
_cairo_gl_surface_paint,
_cairo_gl_surface_mask,
_cairo_gl_surface_stroke,
_cairo_gl_surface_fill,
NULL, /* fill/stroke */
_cairo_gl_surface_glyphs,
};