1/*
2 * Copyright (C) 2011 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
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27
28#if USE(ACCELERATED_COMPOSITING)
29
30#include "cc/CCCanvasLayerImpl.h"
31
32#include "CanvasLayerChromium.h"
33#include "GraphicsContext3D.h"
34#include "LayerRendererChromium.h"
35#include <wtf/text/WTFString.h>
36
37namespace WebCore {
38
39CCCanvasLayerImpl::CCCanvasLayerImpl(LayerChromium* owner)
40    : CCLayerImpl(owner)
41    , m_textureId(0)
42    , m_premultipliedAlpha(true)
43{
44}
45
46CCCanvasLayerImpl::~CCCanvasLayerImpl()
47{
48}
49
50void CCCanvasLayerImpl::draw(const IntRect&)
51{
52    ASSERT(layerRenderer());
53    const CCCanvasLayerImpl::Program* program = layerRenderer()->canvasLayerProgram();
54    ASSERT(program && program->initialized());
55    GraphicsContext3D* context = layerRenderer()->context();
56    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE0));
57    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId));
58    GC3Denum sfactor = m_premultipliedAlpha ? GraphicsContext3D::ONE : GraphicsContext3D::SRC_ALPHA;
59    GLC(context, context->blendFunc(sfactor, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
60    layerRenderer()->useShader(program->program());
61    GLC(context, context->uniform1i(program->fragmentShader().samplerLocation(), 0));
62    LayerChromium::drawTexturedQuad(context, layerRenderer()->projectionMatrix(), drawTransform(),
63                                    bounds().width(), bounds().height(), drawOpacity(),
64                                    program->vertexShader().matrixLocation(),
65                                    program->fragmentShader().alphaLocation());
66
67}
68
69
70void CCCanvasLayerImpl::dumpLayerProperties(TextStream& ts, int indent) const
71{
72    writeIndent(ts, indent);
73    ts << "canvas layer texture id: " << m_textureId << " premultiplied: " << m_premultipliedAlpha << "\n";
74    CCLayerImpl::dumpLayerProperties(ts, indent);
75}
76
77}
78
79#endif // USE(ACCELERATED_COMPOSITING)
80