add cairo

1 files changed, 793 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-gl-operand.c b/libs/cairo-1.16.0/src/cairo-gl-operand.c
new file mode 100644
index 0000000..a754bde
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-gl-operand.c
@@ -0,0 +1,793 @@
+/* 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
+ * 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-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;
+    }
+}