CanvasLayerChromium.cpp revision 81bc750723a18f21cd17d1b173cd2a4dda9cea6e 
1/*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32
33#if USE(ACCELERATED_COMPOSITING)
34
35#include "CanvasLayerChromium.h"
36
37#include "cc/CCLayerImpl.h"
38#include "GraphicsContext3D.h"
39#include "LayerRendererChromium.h"
40
41namespace WebCore {
42
43unsigned CanvasLayerChromium::m_shaderProgramId = 0;
44
45CanvasLayerChromium::CanvasLayerChromium(GraphicsLayerChromium* owner)
46    : LayerChromium(owner)
47    , m_textureChanged(true)
48    , m_textureId(0)
49    , m_premultipliedAlpha(true)
50{
51}
52
53CanvasLayerChromium::~CanvasLayerChromium()
54{
55}
56
57void CanvasLayerChromium::draw()
58{
59    ASSERT(layerRenderer());
60    const CanvasLayerChromium::Program* program = layerRenderer()->canvasLayerProgram();
61    ASSERT(program && program->initialized());
62    GraphicsContext3D* context = layerRendererContext();
63    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE0));
64    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId));
65    GC3Denum sfactor = m_premultipliedAlpha ? GraphicsContext3D::ONE : GraphicsContext3D::SRC_ALPHA;
66    GLC(context, context->blendFunc(sfactor, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
67    layerRenderer()->useShader(program->program());
68    GLC(context, context->uniform1i(program->fragmentShader().samplerLocation(), 0));
69    drawTexturedQuad(context, layerRenderer()->projectionMatrix(), ccLayerImpl()->drawTransform(),
70                     bounds().width(), bounds().height(), ccLayerImpl()->drawOpacity(),
71                     program->vertexShader().matrixLocation(),
72                     program->fragmentShader().alphaLocation());
73}
74
75}
76#endif // USE(ACCELERATED_COMPOSITING)
77