mirror of
https://github.com/mozilla/gecko-dev.git
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286 lines
8.3 KiB
C++
286 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <cstring>
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#include "2D.h"
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#include "DataSurfaceHelpers.h"
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#include "Logging.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/PodOperations.h"
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#include "Tools.h"
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namespace mozilla {
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namespace gfx {
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uint8_t*
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DataAtOffset(DataSourceSurface* aSurface, IntPoint aPoint)
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{
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if (!SurfaceContainsPoint(aSurface, aPoint)) {
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MOZ_CRASH("sample position needs to be inside surface!");
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}
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MOZ_ASSERT(Factory::CheckSurfaceSize(aSurface->GetSize()),
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"surface size overflows - this should have been prevented when the surface was created");
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uint8_t* data = aSurface->GetData() + aPoint.y * aSurface->Stride() +
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aPoint.x * BytesPerPixel(aSurface->GetFormat());
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if (data < aSurface->GetData()) {
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MOZ_CRASH("out-of-range data access");
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}
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return data;
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}
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// This check is safe against integer overflow.
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bool
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SurfaceContainsPoint(SourceSurface* aSurface, const IntPoint& aPoint)
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{
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IntSize size = aSurface->GetSize();
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return aPoint.x >= 0 && aPoint.x < size.width &&
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aPoint.y >= 0 && aPoint.y < size.height;
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}
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void
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ConvertBGRXToBGRA(uint8_t* aData, const IntSize &aSize, const int32_t aStride)
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{
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int height = aSize.height, width = aSize.width * 4;
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for (int row = 0; row < height; ++row) {
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for (int column = 0; column < width; column += 4) {
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#ifdef IS_BIG_ENDIAN
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aData[column] = 0xFF;
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#else
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aData[column + 3] = 0xFF;
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#endif
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}
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aData += aStride;
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}
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}
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void
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CopySurfaceDataToPackedArray(uint8_t* aSrc, uint8_t* aDst, IntSize aSrcSize,
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int32_t aSrcStride, int32_t aBytesPerPixel)
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{
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MOZ_ASSERT(aBytesPerPixel > 0,
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"Negative stride for aDst not currently supported");
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MOZ_ASSERT(BufferSizeFromStrideAndHeight(aSrcStride, aSrcSize.height) > 0,
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"How did we end up with a surface with such a big buffer?");
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int packedStride = aSrcSize.width * aBytesPerPixel;
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if (aSrcStride == packedStride) {
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// aSrc is already packed, so we can copy with a single memcpy.
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memcpy(aDst, aSrc, packedStride * aSrcSize.height);
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} else {
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// memcpy one row at a time.
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for (int row = 0; row < aSrcSize.height; ++row) {
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memcpy(aDst, aSrc, packedStride);
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aSrc += aSrcStride;
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aDst += packedStride;
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}
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}
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}
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void
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CopyBGRXSurfaceDataToPackedBGRArray(uint8_t* aSrc, uint8_t* aDst,
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IntSize aSrcSize, int32_t aSrcStride)
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{
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int packedStride = aSrcSize.width * 3;
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uint8_t* srcPx = aSrc;
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uint8_t* dstPx = aDst;
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for (int row = 0; row < aSrcSize.height; ++row) {
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for (int col = 0; col < aSrcSize.height; ++col) {
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dstPx[0] = srcPx[0];
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dstPx[1] = srcPx[1];
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dstPx[2] = srcPx[2];
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// srcPx[3] (unused or alpha component) dropped on floor
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srcPx += 4;
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dstPx += 3;
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}
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srcPx = aSrc += aSrcStride;
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dstPx = aDst += packedStride;
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}
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}
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uint8_t*
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SurfaceToPackedBGRA(DataSourceSurface *aSurface)
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{
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SurfaceFormat format = aSurface->GetFormat();
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if (format != SurfaceFormat::B8G8R8A8 && format != SurfaceFormat::B8G8R8X8) {
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return nullptr;
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}
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IntSize size = aSurface->GetSize();
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uint8_t* imageBuffer = new (std::nothrow) uint8_t[size.width * size.height * sizeof(uint32_t)];
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if (!imageBuffer) {
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return nullptr;
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}
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DataSourceSurface::MappedSurface map;
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if (!aSurface->Map(DataSourceSurface::MapType::READ, &map)) {
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delete [] imageBuffer;
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return nullptr;
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}
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CopySurfaceDataToPackedArray(map.mData, imageBuffer, size,
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map.mStride, 4 * sizeof(uint8_t));
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aSurface->Unmap();
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if (format == SurfaceFormat::B8G8R8X8) {
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// Convert BGRX to BGRA by setting a to 255.
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ConvertBGRXToBGRA(reinterpret_cast<uint8_t *>(imageBuffer), size, size.width * sizeof(uint32_t));
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}
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return imageBuffer;
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}
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uint8_t*
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SurfaceToPackedBGR(DataSourceSurface *aSurface)
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{
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SurfaceFormat format = aSurface->GetFormat();
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MOZ_ASSERT(format == SurfaceFormat::B8G8R8X8, "Format not supported");
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if (format != SurfaceFormat::B8G8R8X8) {
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// To support B8G8R8A8 we'd need to un-pre-multiply alpha
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return nullptr;
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}
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IntSize size = aSurface->GetSize();
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uint8_t* imageBuffer = new (std::nothrow) uint8_t[size.width * size.height * 3 * sizeof(uint8_t)];
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if (!imageBuffer) {
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return nullptr;
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}
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DataSourceSurface::MappedSurface map;
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if (!aSurface->Map(DataSourceSurface::MapType::READ, &map)) {
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delete [] imageBuffer;
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return nullptr;
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}
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CopyBGRXSurfaceDataToPackedBGRArray(map.mData, imageBuffer, size,
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map.mStride);
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aSurface->Unmap();
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return imageBuffer;
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}
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void
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ClearDataSourceSurface(DataSourceSurface *aSurface)
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{
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DataSourceSurface::MappedSurface map;
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if (!aSurface->Map(DataSourceSurface::MapType::WRITE, &map)) {
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MOZ_ASSERT(false, "Failed to map DataSourceSurface");
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return;
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}
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// We avoid writing into the gaps between the rows here since we can't be
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// sure that some drivers don't use those bytes.
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uint32_t width = aSurface->GetSize().width;
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uint32_t bytesPerRow = width * BytesPerPixel(aSurface->GetFormat());
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uint8_t* row = map.mData;
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// converting to size_t here because otherwise the temporaries can overflow
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// and we can end up with |end| being a bad address!
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uint8_t* end = row + size_t(map.mStride) * size_t(aSurface->GetSize().height);
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while (row != end) {
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memset(row, 0, bytesPerRow);
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row += map.mStride;
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}
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aSurface->Unmap();
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}
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size_t
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BufferSizeFromStrideAndHeight(int32_t aStride,
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int32_t aHeight,
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int32_t aExtraBytes)
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{
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if (MOZ_UNLIKELY(aHeight <= 0)) {
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return 0;
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}
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// We limit the length returned to values that can be represented by int32_t
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// because we don't want to allocate buffers any bigger than that. This
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// allows for a buffer size of over 2 GiB which is already rediculously
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// large and will make the process janky. (Note the choice of the signed type
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// is deliberate because we specifically don't want the returned value to
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// overflow if someone stores the buffer length in an int32_t variable.)
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CheckedInt32 requiredBytes =
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CheckedInt32(aStride) * CheckedInt32(aHeight) + CheckedInt32(aExtraBytes);
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if (MOZ_UNLIKELY(!requiredBytes.isValid())) {
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gfxWarning() << "Buffer size too big; returning zero";
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return 0;
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}
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return requiredBytes.value();
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}
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/**
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* aSrcRect: Rect relative to the aSrc surface
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* aDestPoint: Point inside aDest surface
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*/
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void
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CopyRect(DataSourceSurface* aSrc, DataSourceSurface* aDest,
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IntRect aSrcRect, IntPoint aDestPoint)
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{
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if (aSrcRect.Overflows() ||
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IntRect(aDestPoint, aSrcRect.Size()).Overflows()) {
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MOZ_CRASH("we should never be getting invalid rects at this point");
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}
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MOZ_RELEASE_ASSERT(aSrc->GetFormat() == aDest->GetFormat(),
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"different surface formats");
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MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aSrc->GetSize()).Contains(aSrcRect),
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"source rect too big for source surface");
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MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aDest->GetSize()).Contains(IntRect(aDestPoint, aSrcRect.Size())),
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"dest surface too small");
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if (aSrcRect.IsEmpty()) {
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return;
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}
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uint8_t* sourceData = DataAtOffset(aSrc, aSrcRect.TopLeft());
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uint32_t sourceStride = aSrc->Stride();
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uint8_t* destData = DataAtOffset(aDest, aDestPoint);
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uint32_t destStride = aDest->Stride();
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if (BytesPerPixel(aSrc->GetFormat()) == 4) {
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for (int32_t y = 0; y < aSrcRect.height; y++) {
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PodCopy((int32_t*)destData, (int32_t*)sourceData, aSrcRect.width);
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sourceData += sourceStride;
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destData += destStride;
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}
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} else if (BytesPerPixel(aSrc->GetFormat()) == 1) {
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for (int32_t y = 0; y < aSrcRect.height; y++) {
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PodCopy(destData, sourceData, aSrcRect.width);
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sourceData += sourceStride;
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destData += destStride;
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}
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}
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}
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TemporaryRef<DataSourceSurface>
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CreateDataSourceSurfaceByCloning(DataSourceSurface* aSource)
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{
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RefPtr<DataSourceSurface> copy =
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Factory::CreateDataSourceSurface(aSource->GetSize(), aSource->GetFormat(), true);
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if (copy) {
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CopyRect(aSource, copy, IntRect(IntPoint(), aSource->GetSize()), IntPoint());
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}
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return copy.forget();
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}
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}
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}
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