Source code
Revision control
Copy as Markdown
Other Tools
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2009 Eric Anholt
* Copyright © 2009 Chris Wilson
* Copyright © 2005,2010 Red Hat, Inc
* Copyright © 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
*
* 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-private.h"
#include "cairo-surface-backend-private.h"
#include "cairo-surface-offset-private.h"
#include "cairo-surface-subsurface-inline.h"
static cairo_int_status_t
_cairo_gl_create_gradient_texture (cairo_gl_surface_t *dst,
const cairo_gradient_pattern_t *pattern,
cairo_gl_gradient_t **gradient)
{
cairo_gl_context_t *ctx;
cairo_status_t status;
status = _cairo_gl_context_acquire (dst->base.device, &ctx);
if (unlikely (status))
return status;
status = _cairo_gl_gradient_create (ctx, pattern->n_stops, pattern->stops, gradient);
return _cairo_gl_context_release (ctx, status);
}
static cairo_status_t
_cairo_gl_subsurface_clone_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *_src,
cairo_gl_surface_t *dst,
const cairo_rectangle_int_t *sample,
const cairo_rectangle_int_t *extents,
cairo_bool_t use_texgen)
{
const cairo_surface_pattern_t *src = (cairo_surface_pattern_t *)_src;
cairo_surface_pattern_t local_pattern;
cairo_surface_subsurface_t *sub;
cairo_gl_surface_t *surface;
cairo_gl_context_t *ctx;
cairo_surface_attributes_t *attributes;
cairo_status_t status;
sub = (cairo_surface_subsurface_t *) src->surface;
if (sub->snapshot &&
sub->snapshot->type == CAIRO_SURFACE_TYPE_GL &&
sub->snapshot->device == dst->base.device)
{
surface = (cairo_gl_surface_t *)
cairo_surface_reference (sub->snapshot);
}
else
{
status = _cairo_gl_context_acquire (dst->base.device, &ctx);
if (unlikely (status))
return status;
/* XXX Trim surface to the sample area within the subsurface? */
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_scratch (ctx,
sub->target->content,
sub->extents.width,
sub->extents.height);
if (surface->base.status)
return _cairo_gl_context_release (ctx, surface->base.status);
_cairo_pattern_init_for_surface (&local_pattern, sub->target);
cairo_matrix_init_translate (&local_pattern.base.matrix,
sub->extents.x, sub->extents.y);
local_pattern.base.filter = CAIRO_FILTER_NEAREST;
status = _cairo_surface_paint (&surface->base,
CAIRO_OPERATOR_SOURCE,
&local_pattern.base,
NULL);
_cairo_pattern_fini (&local_pattern.base);
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status)) {
cairo_surface_destroy (&surface->base);
return status;
}
_cairo_surface_subsurface_set_snapshot (&sub->base, &surface->base);
}
status = _cairo_gl_surface_resolve_multisampling (surface);
if (unlikely (status))
return status;
attributes = &operand->texture.attributes;
operand->type = CAIRO_GL_OPERAND_TEXTURE;
operand->texture.surface = surface;
operand->texture.owns_surface = surface;
operand->texture.tex = surface->tex;
if (_cairo_gl_device_requires_power_of_two_textures (dst->base.device)) {
attributes->matrix = src->base.matrix;
} else {
cairo_matrix_t m;
cairo_matrix_init_scale (&m,
1.0 / surface->width,
1.0 / surface->height);
cairo_matrix_multiply (&attributes->matrix, &src->base.matrix, &m);
}
attributes->extend = src->base.extend;
attributes->filter = src->base.filter;
attributes->has_component_alpha = src->base.has_component_alpha;
operand->texture.texgen = use_texgen;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_subsurface_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *_src,
cairo_gl_surface_t *dst,
const cairo_rectangle_int_t *sample,
const cairo_rectangle_int_t *extents,
cairo_bool_t use_texgen)
{
const cairo_surface_pattern_t *src = (cairo_surface_pattern_t *)_src;
cairo_surface_subsurface_t *sub;
cairo_gl_surface_t *surface;
cairo_surface_attributes_t *attributes;
cairo_int_status_t status;
sub = (cairo_surface_subsurface_t *) src->surface;
if (sample->x < 0 || sample->y < 0 ||
sample->x + sample->width > sub->extents.width ||
sample->y + sample->height > sub->extents.height)
{
return _cairo_gl_subsurface_clone_operand_init (operand, _src,
dst, sample, extents,
use_texgen);
}
surface = (cairo_gl_surface_t *) sub->target;
if (surface->base.device && surface->base.device != dst->base.device)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (! _cairo_gl_surface_is_texture (surface))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_surface_resolve_multisampling (surface);
if (unlikely (status))
return status;
/* Translate the matrix from
* (unnormalized src -> unnormalized src) to
* (unnormalized dst -> unnormalized src)
*/
_cairo_gl_operand_copy(operand, &surface->operand);
attributes = &operand->texture.attributes;
attributes->matrix = src->base.matrix;
attributes->matrix.x0 += sub->extents.x;
attributes->matrix.y0 += sub->extents.y;
cairo_matrix_multiply (&attributes->matrix,
&attributes->matrix,
&surface->operand.texture.attributes.matrix);
attributes->extend = src->base.extend;
attributes->filter = src->base.filter;
attributes->has_component_alpha = src->base.has_component_alpha;
operand->texture.texgen = use_texgen;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_surface_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *_src,
cairo_gl_surface_t *dst,
const cairo_rectangle_int_t *sample,
const cairo_rectangle_int_t *extents,
cairo_bool_t use_texgen)
{
const cairo_surface_pattern_t *src = (cairo_surface_pattern_t *)_src;
cairo_gl_surface_t *surface;
cairo_surface_attributes_t *attributes;
cairo_int_status_t status;
surface = (cairo_gl_surface_t *) src->surface;
if (surface->base.type != CAIRO_SURFACE_TYPE_GL)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->base.backend->type != CAIRO_SURFACE_TYPE_GL) {
if (_cairo_surface_is_subsurface (&surface->base))
return _cairo_gl_subsurface_operand_init (operand, _src, dst,
sample, extents,
use_texgen);
return CAIRO_INT_STATUS_UNSUPPORTED;
}
if (surface->base.device && surface->base.device != dst->base.device)
return CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->base.device && ! _cairo_gl_surface_is_texture (surface))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_surface_resolve_multisampling (surface);
if (unlikely (status))
return status;
_cairo_gl_operand_copy(operand, &surface->operand);
attributes = &operand->texture.attributes;
cairo_matrix_multiply (&attributes->matrix,
&src->base.matrix,
&attributes->matrix);
attributes->extend = src->base.extend;
attributes->filter = src->base.filter;
attributes->has_component_alpha = src->base.has_component_alpha;
operand->texture.texgen = use_texgen;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_pattern_texture_setup (cairo_gl_operand_t *operand,
const cairo_pattern_t *_src,
cairo_gl_surface_t *dst,
const cairo_rectangle_int_t *extents)
{
cairo_status_t status;
cairo_gl_surface_t *surface;
cairo_gl_context_t *ctx;
cairo_image_surface_t *image;
cairo_bool_t src_is_gl_surface = FALSE;
cairo_rectangle_int_t map_extents;
if (_src->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_t* src_surface = ((cairo_surface_pattern_t *) _src)->surface;
src_is_gl_surface = src_surface->type == CAIRO_SURFACE_TYPE_GL;
}
status = _cairo_gl_context_acquire (dst->base.device, &ctx);
if (unlikely (status))
return status;
surface = (cairo_gl_surface_t *)
_cairo_gl_surface_create_scratch (ctx,
CAIRO_CONTENT_COLOR_ALPHA,
extents->width, extents->height);
map_extents = *extents;
map_extents.x = map_extents.y = 0;
image = _cairo_surface_map_to_image (&surface->base, &map_extents);
/* If the pattern is a GL surface, it belongs to some other GL context,
so we need to release this device while we paint it to the image. */
if (src_is_gl_surface) {
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status)) {
_cairo_surface_unmap_image (&surface->base, image);
goto fail;
}
}
status = _cairo_surface_offset_paint (&image->base, extents->x, extents->y,
CAIRO_OPERATOR_SOURCE, _src, NULL);
if (src_is_gl_surface) {
status = _cairo_gl_context_acquire (dst->base.device, &ctx);
if (unlikely (status)) {
_cairo_surface_unmap_image (&surface->base, image);
goto fail;
}
}
status = _cairo_surface_unmap_image (&surface->base, image);
status = _cairo_gl_context_release (ctx, status);
if (unlikely (status))
goto fail;
*operand = surface->operand;
operand->texture.owns_surface = surface;
operand->texture.attributes.matrix.x0 -= extents->x * operand->texture.attributes.matrix.xx;
operand->texture.attributes.matrix.y0 -= extents->y * operand->texture.attributes.matrix.yy;
return CAIRO_STATUS_SUCCESS;
fail:
cairo_surface_destroy (&surface->base);
return status;
}
void
_cairo_gl_solid_operand_init (cairo_gl_operand_t *operand,
const cairo_color_t *color)
{
operand->type = CAIRO_GL_OPERAND_CONSTANT;
operand->constant.color[0] = color->red * color->alpha;
operand->constant.color[1] = color->green * color->alpha;
operand->constant.color[2] = color->blue * color->alpha;
operand->constant.color[3] = color->alpha;
}
void
_cairo_gl_operand_translate (cairo_gl_operand_t *operand,
double tx, double ty)
{
switch (operand->type) {
case CAIRO_GL_OPERAND_TEXTURE:
operand->texture.attributes.matrix.x0 -= tx * operand->texture.attributes.matrix.xx;
operand->texture.attributes.matrix.y0 -= ty * operand->texture.attributes.matrix.yy;
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
operand->gradient.m.x0 -= tx * operand->gradient.m.xx;
operand->gradient.m.y0 -= ty * operand->gradient.m.yy;
break;
case CAIRO_GL_OPERAND_NONE:
case CAIRO_GL_OPERAND_CONSTANT:
case CAIRO_GL_OPERAND_COUNT:
default:
break;
}
}
static cairo_status_t
_cairo_gl_gradient_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *pattern,
cairo_gl_surface_t *dst,
cairo_bool_t use_texgen)
{
const cairo_gradient_pattern_t *gradient = (const cairo_gradient_pattern_t *)pattern;
cairo_status_t status;
assert (gradient->base.type == CAIRO_PATTERN_TYPE_LINEAR ||
gradient->base.type == CAIRO_PATTERN_TYPE_RADIAL);
if (! _cairo_gl_device_has_glsl (dst->base.device))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_gl_create_gradient_texture (dst,
gradient,
&operand->gradient.gradient);
if (unlikely (status))
return status;
if (gradient->base.type == CAIRO_PATTERN_TYPE_LINEAR) {
cairo_linear_pattern_t *linear = (cairo_linear_pattern_t *) gradient;
double x0, y0, dx, dy, sf, offset;
dx = linear->pd2.x - linear->pd1.x;
dy = linear->pd2.y - linear->pd1.y;
sf = 1.0 / (dx * dx + dy * dy);
dx *= sf;
dy *= sf;
x0 = linear->pd1.x;
y0 = linear->pd1.y;
offset = dx * x0 + dy * y0;
operand->type = CAIRO_GL_OPERAND_LINEAR_GRADIENT;
cairo_matrix_init (&operand->gradient.m, dx, 0, dy, 1, -offset, 0);
if (! _cairo_matrix_is_identity (&pattern->matrix)) {
cairo_matrix_multiply (&operand->gradient.m,
&pattern->matrix,
&operand->gradient.m);
}
} else {
cairo_matrix_t m;
cairo_circle_double_t circles[2];
double x0, y0, r0, dx, dy, dr;
/*
* Some fragment shader implementations use half-floats to
* represent numbers, so the maximum number they can represent
* is about 2^14. Some intermediate computations used in the
* radial gradient shaders can produce results of up to 2*k^4.
* Setting k=8 makes the maximum result about 8192 (assuming
* that the extreme circles are not much smaller than the
* destination image).
*/
_cairo_gradient_pattern_fit_to_range (gradient, 8.,
&operand->gradient.m, circles);
x0 = circles[0].center.x;
y0 = circles[0].center.y;
r0 = circles[0].radius;
dx = circles[1].center.x - x0;
dy = circles[1].center.y - y0;
dr = circles[1].radius - r0;
operand->gradient.a = dx * dx + dy * dy - dr * dr;
operand->gradient.radius_0 = r0;
operand->gradient.circle_d.center.x = dx;
operand->gradient.circle_d.center.y = dy;
operand->gradient.circle_d.radius = dr;
if (operand->gradient.a == 0)
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0;
else if (pattern->extend == CAIRO_EXTEND_NONE)
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE;
else
operand->type = CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT;
cairo_matrix_init_translate (&m, -x0, -y0);
cairo_matrix_multiply (&operand->gradient.m,
&operand->gradient.m,
&m);
}
operand->gradient.extend = pattern->extend;
operand->gradient.texgen = use_texgen;
return CAIRO_STATUS_SUCCESS;
}
void
_cairo_gl_operand_copy (cairo_gl_operand_t *dst,
const cairo_gl_operand_t *src)
{
*dst = *src;
switch (dst->type) {
case CAIRO_GL_OPERAND_CONSTANT:
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
_cairo_gl_gradient_reference (dst->gradient.gradient);
break;
case CAIRO_GL_OPERAND_TEXTURE:
cairo_surface_reference (&dst->texture.owns_surface->base);
break;
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
break;
}
}
void
_cairo_gl_operand_destroy (cairo_gl_operand_t *operand)
{
switch (operand->type) {
case CAIRO_GL_OPERAND_CONSTANT:
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
_cairo_gl_gradient_destroy (operand->gradient.gradient);
break;
case CAIRO_GL_OPERAND_TEXTURE:
cairo_surface_destroy (&operand->texture.owns_surface->base);
break;
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
break;
}
operand->type = CAIRO_GL_OPERAND_NONE;
}
cairo_int_status_t
_cairo_gl_operand_init (cairo_gl_operand_t *operand,
const cairo_pattern_t *pattern,
cairo_gl_surface_t *dst,
const cairo_rectangle_int_t *sample,
const cairo_rectangle_int_t *extents,
cairo_bool_t use_texgen)
{
cairo_int_status_t status;
TRACE ((stderr, "%s: type=%d\n", __FUNCTION__, pattern->type));
switch (pattern->type) {
case CAIRO_PATTERN_TYPE_SOLID:
_cairo_gl_solid_operand_init (operand,
&((cairo_solid_pattern_t *) pattern)->color);
return CAIRO_STATUS_SUCCESS;
case CAIRO_PATTERN_TYPE_SURFACE:
status = _cairo_gl_surface_operand_init (operand, pattern, dst,
sample, extents, use_texgen);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
break;
return status;
case CAIRO_PATTERN_TYPE_LINEAR:
case CAIRO_PATTERN_TYPE_RADIAL:
status = _cairo_gl_gradient_operand_init (operand, pattern, dst,
use_texgen);
if (status == CAIRO_INT_STATUS_UNSUPPORTED)
break;
return status;
default:
case CAIRO_PATTERN_TYPE_MESH:
case CAIRO_PATTERN_TYPE_RASTER_SOURCE:
break;
}
return _cairo_gl_pattern_texture_setup (operand, pattern, dst, extents);
}
cairo_filter_t
_cairo_gl_operand_get_filter (cairo_gl_operand_t *operand)
{
cairo_filter_t filter;
switch ((int) operand->type) {
case CAIRO_GL_OPERAND_TEXTURE:
filter = operand->texture.attributes.filter;
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
filter = CAIRO_FILTER_BILINEAR;
break;
default:
filter = CAIRO_FILTER_DEFAULT;
break;
}
return filter;
}
GLint
_cairo_gl_operand_get_gl_filter (cairo_gl_operand_t *operand)
{
cairo_filter_t filter = _cairo_gl_operand_get_filter (operand);
return filter != CAIRO_FILTER_FAST && filter != CAIRO_FILTER_NEAREST ?
GL_LINEAR :
GL_NEAREST;
}
cairo_extend_t
_cairo_gl_operand_get_extend (cairo_gl_operand_t *operand)
{
cairo_extend_t extend;
switch ((int) operand->type) {
case CAIRO_GL_OPERAND_TEXTURE:
extend = operand->texture.attributes.extend;
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
extend = operand->gradient.extend;
break;
default:
extend = CAIRO_EXTEND_NONE;
break;
}
return extend;
}
void
_cairo_gl_operand_bind_to_shader (cairo_gl_context_t *ctx,
cairo_gl_operand_t *operand,
cairo_gl_tex_t tex_unit)
{
const cairo_matrix_t *texgen = NULL;
switch (operand->type) {
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
return;
case CAIRO_GL_OPERAND_CONSTANT:
_cairo_gl_shader_bind_vec4 (ctx,
ctx->current_shader->constant_location[tex_unit],
operand->constant.color[0],
operand->constant.color[1],
operand->constant.color[2],
operand->constant.color[3]);
return;
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
_cairo_gl_shader_bind_float (ctx,
ctx->current_shader->a_location[tex_unit],
operand->gradient.a);
/* fall through */
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
_cairo_gl_shader_bind_vec3 (ctx,
ctx->current_shader->circle_d_location[tex_unit],
operand->gradient.circle_d.center.x,
operand->gradient.circle_d.center.y,
operand->gradient.circle_d.radius);
_cairo_gl_shader_bind_float (ctx,
ctx->current_shader->radius_0_location[tex_unit],
operand->gradient.radius_0);
/* fall through */
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_TEXTURE:
/*
* For GLES2 we use shaders to implement GL_CLAMP_TO_BORDER (used
* with CAIRO_EXTEND_NONE). When bilinear filtering is enabled,
* these shaders need the texture dimensions for their calculations.
*/
if ((ctx->gl_flavor == CAIRO_GL_FLAVOR_ES3 ||
ctx->gl_flavor == CAIRO_GL_FLAVOR_ES2) &&
_cairo_gl_operand_get_extend (operand) == CAIRO_EXTEND_NONE &&
_cairo_gl_operand_get_gl_filter (operand) == GL_LINEAR)
{
float width, height;
if (operand->type == CAIRO_GL_OPERAND_TEXTURE) {
width = operand->texture.surface->width;
height = operand->texture.surface->height;
}
else {
width = operand->gradient.gradient->cache_entry.size,
height = 1;
}
_cairo_gl_shader_bind_vec2 (ctx,
ctx->current_shader->texdims_location[tex_unit],
width, height);
}
break;
}
if (operand->type == CAIRO_GL_OPERAND_TEXTURE) {
if (operand->texture.texgen)
texgen = &operand->texture.attributes.matrix;
} else {
if (operand->gradient.texgen)
texgen = &operand->gradient.m;
}
if (texgen) {
_cairo_gl_shader_bind_matrix(ctx,
ctx->current_shader->texgen_location[tex_unit],
texgen);
}
}
cairo_bool_t
_cairo_gl_operand_needs_setup (cairo_gl_operand_t *dest,
cairo_gl_operand_t *source,
unsigned int vertex_offset)
{
if (dest->type != source->type)
return TRUE;
if (dest->vertex_offset != vertex_offset)
return TRUE;
switch (source->type) {
case CAIRO_GL_OPERAND_NONE:
return FALSE;
case CAIRO_GL_OPERAND_CONSTANT:
return dest->constant.color[0] != source->constant.color[0] ||
dest->constant.color[1] != source->constant.color[1] ||
dest->constant.color[2] != source->constant.color[2] ||
dest->constant.color[3] != source->constant.color[3];
case CAIRO_GL_OPERAND_TEXTURE:
return dest->texture.surface != source->texture.surface ||
dest->texture.attributes.extend != source->texture.attributes.extend ||
dest->texture.attributes.filter != source->texture.attributes.filter ||
dest->texture.attributes.has_component_alpha != source->texture.attributes.has_component_alpha;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
/* XXX: improve this */
return TRUE;
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
break;
}
return TRUE;
}
unsigned int
_cairo_gl_operand_get_vertex_size (const cairo_gl_operand_t *operand)
{
switch (operand->type) {
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
case CAIRO_GL_OPERAND_CONSTANT:
return 0;
case CAIRO_GL_OPERAND_TEXTURE:
return operand->texture.texgen ? 0 : 2 * sizeof (GLfloat);
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
return operand->gradient.texgen ? 0 : 2 * sizeof (GLfloat);
}
}
void
_cairo_gl_operand_emit (cairo_gl_operand_t *operand,
GLfloat ** vb,
GLfloat x,
GLfloat y)
{
switch (operand->type) {
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
case CAIRO_GL_OPERAND_CONSTANT:
break;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
if (! operand->gradient.texgen) {
double s = x;
double t = y;
cairo_matrix_transform_point (&operand->gradient.m, &s, &t);
*(*vb)++ = s;
*(*vb)++ = t;
}
break;
case CAIRO_GL_OPERAND_TEXTURE:
if (! operand->texture.texgen) {
cairo_surface_attributes_t *src_attributes = &operand->texture.attributes;
double s = x;
double t = y;
cairo_matrix_transform_point (&src_attributes->matrix, &s, &t);
*(*vb)++ = s;
*(*vb)++ = t;
}
break;
}
}