gfx/thebes/gfxAlphaRecovery.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfxAlphaRecovery.h"
   7
   8 #include "gfxImageSurface.h"
   9
  10 #define MOZILLA_SSE_INCLUDE_HEADER_FOR_SSE2
  11 #include "mozilla/SSE.h"
  12
  13 /* static */
  14 bool gfxAlphaRecovery::RecoverAlpha(gfxImageSurface* blackSurf,
  15                                     const gfxImageSurface* whiteSurf) {
  16   mozilla::gfx::IntSize size = blackSurf->GetSize();
  17
  18   if (size != whiteSurf->GetSize() ||
  19       (blackSurf->Format() != mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32 &&
  20        blackSurf->Format() != mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32) ||
  21       (whiteSurf->Format() != mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32 &&
  22        whiteSurf->Format() != mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32))
  23     return false;
  24
  25 #ifdef MOZILLA_MAY_SUPPORT_SSE2
  26   if (mozilla::supports_sse2() && RecoverAlphaSSE2(blackSurf, whiteSurf)) {
  27     return true;
  28   }
  29 #endif
  30
  31   blackSurf->Flush();
  32   whiteSurf->Flush();
  33
  34   unsigned char* blackData = blackSurf->Data();
  35   unsigned char* whiteData = whiteSurf->Data();
  36
  37   for (int32_t i = 0; i < size.height; ++i) {
  38     uint32_t* blackPixel = reinterpret_cast<uint32_t*>(blackData);
  39     const uint32_t* whitePixel = reinterpret_cast<uint32_t*>(whiteData);
  40     for (int32_t j = 0; j < size.width; ++j) {
  41       uint32_t recovered = RecoverPixel(blackPixel[j], whitePixel[j]);
  42       blackPixel[j] = recovered;
  43     }
  44     blackData += blackSurf->Stride();
  45     whiteData += whiteSurf->Stride();
  46   }
  47
  48   blackSurf->MarkDirty();
  49
  50   return true;
  51 }