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76 lines
2.0 KiB
C++
76 lines
2.0 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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#pragma once
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#include "2D.h"
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namespace mozilla {
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namespace gfx {
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static inline 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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/**
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* Convert aSurface to a packed buffer in BGRA format. The pixel data is
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* returned in a buffer allocated with new uint8_t[].
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*/
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inline 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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size_t stride = aSurface->Stride();
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uint32_t* src = reinterpret_cast<uint32_t*>(aSurface->GetData());
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uint32_t* dst = reinterpret_cast<uint32_t*>(imageBuffer);
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if (stride == size.width * sizeof(uint32_t)) {
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// DataSourceSurface is already packed. We can use memcpy.
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memcpy(dst, src, size.width * size.height * sizeof(uint32_t));
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} else {
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for (int row = 0; row < size.height; ++row) {
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for (int column = 0; column < size.width; ++column) {
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*dst++ = src[column];
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}
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src += (stride/4);
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}
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}
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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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}
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}
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