1 files changed, 173 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/chromium/cc/CCVideoLayerImpl.cpp b/Source/WebCore/platform/graphics/chromium/cc/CCVideoLayerImpl.cpp
new file mode 100644
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--- /dev/null
+++ b/Source/WebCore/platform/graphics/chromium/cc/CCVideoLayerImpl.cpp
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "cc/CCVideoLayerImpl.h"
+
+#include "GraphicsContext3D.h"
+#include "LayerRendererChromium.h"
+#include "NotImplemented.h"
+#include "VideoLayerChromium.h"
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+// These values are magic numbers that are used in the transformation
+// from YUV to RGB color values.
+// They are taken from the following webpage:
+// http://www.fourcc.org/fccyvrgb.php
+const float CCVideoLayerImpl::yuv2RGB[9] = {
+    1.164f, 1.164f, 1.164f,
+    0.f, -.391f, 2.018f,
+    1.596f, -.813f, 0.f,
+};
+
+// These values map to 16, 128, and 128 respectively, and are computed
+// as a fraction over 256 (e.g. 16 / 256 = 0.0625).
+// They are used in the YUV to RGBA conversion formula:
+//   Y - 16   : Gives 16 values of head and footroom for overshooting
+//   U - 128  : Turns unsigned U into signed U [-128,127]
+//   V - 128  : Turns unsigned V into signed V [-128,127]
+const float CCVideoLayerImpl::yuvAdjust[3] = {
+    -0.0625f,
+    -0.5f,
+    -0.5f,
+};
+
+CCVideoLayerImpl::CCVideoLayerImpl(LayerChromium* owner)
+    : CCLayerImpl(owner)
+{
+}
+
+CCVideoLayerImpl::~CCVideoLayerImpl()
+{
+    cleanupResources();
+}
+
+void CCVideoLayerImpl::setTexture(size_t i, VideoLayerChromium::Texture texture)
+{
+    ASSERT(i < 3);
+    m_textures[i] = texture;
+}
+
+void CCVideoLayerImpl::draw()
+{
+    if (m_skipsDraw)
+        return;
+
+    ASSERT(layerRenderer());
+    const RGBAProgram* rgbaProgram = layerRenderer()->videoLayerRGBAProgram();
+    ASSERT(rgbaProgram && rgbaProgram->initialized());
+    const YUVProgram* yuvProgram = layerRenderer()->videoLayerYUVProgram();
+    ASSERT(yuvProgram && yuvProgram->initialized());
+
+    switch (m_frameFormat) {
+    case VideoFrameChromium::YV12:
+    case VideoFrameChromium::YV16:
+        drawYUV(yuvProgram);
+        break;
+    case VideoFrameChromium::RGBA:
+        drawRGBA(rgbaProgram);
+        break;
+    default:
+        // FIXME: Implement other paths.
+        notImplemented();
+        break;
+    }
+}
+
+void CCVideoLayerImpl::drawYUV(const CCVideoLayerImpl::YUVProgram* program) const
+{
+    GraphicsContext3D* context = layerRenderer()->context();
+    VideoLayerChromium::Texture yTexture = m_textures[VideoFrameChromium::yPlane];
+    VideoLayerChromium::Texture uTexture = m_textures[VideoFrameChromium::uPlane];
+    VideoLayerChromium::Texture vTexture = m_textures[VideoFrameChromium::vPlane];
+
+    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE1));
+    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, yTexture.id));
+    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE2));
+    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, uTexture.id));
+    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE3));
+    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, vTexture.id));
+
+    layerRenderer()->useShader(program->program());
+
+    float yWidthScaleFactor = static_cast<float>(yTexture.visibleSize.width()) / yTexture.size.width();
+    // Arbitrarily take the u sizes because u and v dimensions are identical.
+    float uvWidthScaleFactor = static_cast<float>(uTexture.visibleSize.width()) / uTexture.size.width();
+    GLC(context, context->uniform1f(program->vertexShader().yWidthScaleFactorLocation(), yWidthScaleFactor));
+    GLC(context, context->uniform1f(program->vertexShader().uvWidthScaleFactorLocation(), uvWidthScaleFactor));
+
+    GLC(context, context->uniform1i(program->fragmentShader().yTextureLocation(), 1));
+    GLC(context, context->uniform1i(program->fragmentShader().uTextureLocation(), 2));
+    GLC(context, context->uniform1i(program->fragmentShader().vTextureLocation(), 3));
+
+    GLC(context, context->uniformMatrix3fv(program->fragmentShader().ccMatrixLocation(), 0, const_cast<float*>(yuv2RGB), 1));
+    GLC(context, context->uniform3fv(program->fragmentShader().yuvAdjLocation(), const_cast<float*>(yuvAdjust), 1));
+
+    LayerChromium::drawTexturedQuad(context, layerRenderer()->projectionMatrix(), drawTransform(),
+                                    bounds().width(), bounds().height(), drawOpacity(),
+                                    program->vertexShader().matrixLocation(),
+                                    program->fragmentShader().alphaLocation());
+
+    // Reset active texture back to texture 0.
+    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE0));
+}
+
+void CCVideoLayerImpl::drawRGBA(const CCVideoLayerImpl::RGBAProgram* program) const
+{
+    GraphicsContext3D* context = layerRenderer()->context();
+    VideoLayerChromium::Texture texture = m_textures[VideoFrameChromium::rgbPlane];
+
+    GLC(context, context->activeTexture(GraphicsContext3D::TEXTURE0));
+    GLC(context, context->bindTexture(GraphicsContext3D::TEXTURE_2D, texture.id));
+
+    layerRenderer()->useShader(program->program());
+    float widthScaleFactor = static_cast<float>(texture.visibleSize.width()) / texture.size.width();
+    GLC(context, context->uniform4f(program->vertexShader().texTransformLocation(), 0, 0, widthScaleFactor, 1));
+
+    GLC(context, context->uniform1i(program->fragmentShader().samplerLocation(), 0));
+
+    LayerChromium::drawTexturedQuad(context, layerRenderer()->projectionMatrix(), drawTransform(),
+                                    bounds().width(), bounds().height(), drawOpacity(),
+                                    program->vertexShader().matrixLocation(),
+                                    program->fragmentShader().alphaLocation());
+}
+
+
+void CCVideoLayerImpl::dumpLayerProperties(TextStream& ts, int indent) const
+{
+    writeIndent(ts, indent);
+    ts << "video layer\n";
+    CCLayerImpl::dumpLayerProperties(ts, indent);
+}
+
+}
+
+#endif // USE(ACCELERATED_COMPOSITING)
+