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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "LayerTextureSubImage.h"
#include "CCRendererGL.h" // For the GLC() macro.
#include "GraphicsContext3D.h"
#include "Extensions3DChromium.h"
#include "TraceEvent.h"
#include <public/WebGraphicsContext3D.h>
using WebKit::WebGraphicsContext3D;
namespace cc {
LayerTextureSubImage::LayerTextureSubImage(bool useMapTexSubImage)
: m_useMapTexSubImage(useMapTexSubImage)
, m_subImageSize(0)
{
}
LayerTextureSubImage::~LayerTextureSubImage()
{
}
void LayerTextureSubImage::upload(const uint8_t* image, const IntRect& imageRect,
const IntRect& sourceRect, const IntSize& destOffset,
GC3Denum format, WebGraphicsContext3D* context)
{
if (m_useMapTexSubImage)
uploadWithMapTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
else
uploadWithTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
}
void LayerTextureSubImage::uploadWithTexSubImage(const uint8_t* image, const IntRect& imageRect,
const IntRect& sourceRect, const IntSize& destOffset,
GC3Denum format, WebGraphicsContext3D* context)
{
TRACE_EVENT0("cc", "LayerTextureSubImage::uploadWithTexSubImage");
// Offset from image-rect to source-rect.
IntPoint offset(sourceRect.x() - imageRect.x(), sourceRect.y() - imageRect.y());
const uint8_t* pixelSource;
if (imageRect.width() == sourceRect.width() && !offset.x())
pixelSource = &image[4 * offset.y() * imageRect.width()];
else {
size_t neededSize = 4 * sourceRect.width() * sourceRect.height();
if (m_subImageSize < neededSize) {
m_subImage = adoptArrayPtr(new uint8_t[neededSize]);
m_subImageSize = neededSize;
}
// Strides not equal, so do a row-by-row memcpy from the
// paint results into a temp buffer for uploading.
for (int row = 0; row < sourceRect.height(); ++row)
memcpy(&m_subImage[sourceRect.width() * 4 * row],
&image[4 * (offset.x() + (offset.y() + row) * imageRect.width())],
sourceRect.width() * 4);
pixelSource = &m_subImage[0];
}
GLC(context, context->texSubImage2D(GraphicsContext3D::TEXTURE_2D, 0, destOffset.width(), destOffset.height(), sourceRect.width(), sourceRect.height(), format, GraphicsContext3D::UNSIGNED_BYTE, pixelSource));
}
void LayerTextureSubImage::uploadWithMapTexSubImage(const uint8_t* image, const IntRect& imageRect,
const IntRect& sourceRect, const IntSize& destOffset,
GC3Denum format, WebGraphicsContext3D* context)
{
TRACE_EVENT0("cc", "LayerTextureSubImage::uploadWithMapTexSubImage");
// Offset from image-rect to source-rect.
IntPoint offset(sourceRect.x() - imageRect.x(), sourceRect.y() - imageRect.y());
// Upload tile data via a mapped transfer buffer
uint8_t* pixelDest = static_cast<uint8_t*>(context->mapTexSubImage2DCHROMIUM(GraphicsContext3D::TEXTURE_2D, 0, destOffset.width(), destOffset.height(), sourceRect.width(), sourceRect.height(), format, GraphicsContext3D::UNSIGNED_BYTE, Extensions3DChromium::WRITE_ONLY));
if (!pixelDest) {
uploadWithTexSubImage(image, imageRect, sourceRect, destOffset, format, context);
return;
}
unsigned int componentsPerPixel = 0;
switch (format) {
case GraphicsContext3D::RGBA:
case Extensions3D::BGRA_EXT:
componentsPerPixel = 4;
break;
case GraphicsContext3D::LUMINANCE:
componentsPerPixel = 1;
break;
default:
ASSERT_NOT_REACHED();
}
unsigned int bytesPerComponent = 1;
if (imageRect.width() == sourceRect.width() && !offset.x())
memcpy(pixelDest, &image[offset.y() * imageRect.width() * componentsPerPixel * bytesPerComponent], imageRect.width() * sourceRect.height() * componentsPerPixel * bytesPerComponent);
else {
// Strides not equal, so do a row-by-row memcpy from the
// paint results into the pixelDest
for (int row = 0; row < sourceRect.height(); ++row)
memcpy(&pixelDest[sourceRect.width() * row * componentsPerPixel * bytesPerComponent],
&image[4 * (offset.x() + (offset.y() + row) * imageRect.width())],
sourceRect.width() * componentsPerPixel * bytesPerComponent);
}
GLC(context, context->unmapTexSubImage2DCHROMIUM(pixelDest));
}
} // namespace cc
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