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b272755e2d
This file is currently just a helper for doing PremultiplySurface in Moz2D. It corresponds to an existing Thebes one in the gfxUtils class. An upcoming patch will require this PremultiplySurface method. The existing one in gfxUtils has been renamed internally to DeprecatedPremultiplyTables.
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/* -*- Mode: c++; tab-width: 2; 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 "LayerUtils.h"
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#include "PremultiplyTables.h"
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namespace mozilla {
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namespace layers {
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using namespace mozilla::gfx;
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static inline const uint8_t PremultiplyValue(uint8_t a, uint8_t v) {
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return PremultiplyTable[a*256+v];
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}
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static inline const uint8_t UnpremultiplyValue(uint8_t a, uint8_t v) {
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return UnpremultiplyTable[a*256+v];
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}
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void
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PremultiplySurface(DataSourceSurface* srcSurface,
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DataSourceSurface* destSurface)
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{
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if (!destSurface)
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destSurface = srcSurface;
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IntSize srcSize = srcSurface->GetSize();
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MOZ_ASSERT(srcSurface->GetFormat() == destSurface->GetFormat() &&
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srcSize.width == destSurface->GetSize().width &&
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srcSize.height == destSurface->GetSize().height &&
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srcSurface->Stride() == destSurface->Stride(),
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"Source and destination surfaces don't have identical characteristics");
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MOZ_ASSERT(srcSurface->Stride() == srcSize.width * 4,
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"Source surface stride isn't tightly packed");
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// Only premultiply ARGB32
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if (srcSurface->GetFormat() != SurfaceFormat::B8G8R8A8) {
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if (destSurface != srcSurface) {
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memcpy(destSurface->GetData(), srcSurface->GetData(),
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srcSurface->Stride() * srcSize.height);
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}
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return;
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}
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uint8_t *src = srcSurface->GetData();
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uint8_t *dst = destSurface->GetData();
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uint32_t dim = srcSize.width * srcSize.height;
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for (uint32_t i = 0; i < dim; ++i) {
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#ifdef IS_LITTLE_ENDIAN
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uint8_t b = *src++;
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uint8_t g = *src++;
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uint8_t r = *src++;
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uint8_t a = *src++;
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*dst++ = PremultiplyValue(a, b);
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*dst++ = PremultiplyValue(a, g);
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*dst++ = PremultiplyValue(a, r);
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*dst++ = a;
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#else
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uint8_t a = *src++;
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uint8_t r = *src++;
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uint8_t g = *src++;
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uint8_t b = *src++;
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*dst++ = a;
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*dst++ = PremultiplyValue(a, r);
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*dst++ = PremultiplyValue(a, g);
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*dst++ = PremultiplyValue(a, b);
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#endif
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}
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}
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}
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}
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