зеркало из https://github.com/mozilla/gecko-dev.git
142 строки
3.7 KiB
C++
142 строки
3.7 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 "2D.h"
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#include "DataSurfaceHelpers.h"
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namespace mozilla {
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namespace gfx {
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void
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ConvertBGRXToBGRA(uint8_t* aData, const IntSize &aSize, int32_t aStride)
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{
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uint32_t* pixel = reinterpret_cast<uint32_t*>(aData);
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for (int row = 0; row < aSize.height; ++row) {
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for (int column = 0; column < aSize.width; ++column) {
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#ifdef IS_BIG_ENDIAN
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pixel[column] |= 0x000000FF;
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#else
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pixel[column] |= 0xFF000000;
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#endif
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}
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pixel += (aStride/4);
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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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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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}
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}
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