gfxAlphaRecovery.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "gfxAlphaRecovery.h"

#include "gfxImageSurface.h"

#define MOZILLA_SSE_INCLUDE_HEADER_FOR_SSE2

#include "mozilla/SSE.h"

#include <xsimd/xsimd.hpp>

/* static */

bool gfxAlphaRecovery::RecoverAlpha(gfxImageSurface* blackSurf,

                                    const gfxImageSurface* whiteSurf) {

  mozilla::gfx::IntSize size = blackSurf->GetSize();

  if (size != whiteSurf->GetSize() ||

      (blackSurf->Format() != mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32 &&

       blackSurf->Format() != mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32) ||

      (whiteSurf->Format() != mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32 &&

       whiteSurf->Format() != mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32))

    return false;

#ifdef MOZILLA_MAY_SUPPORT_SSE2

  if (mozilla::supports_sse2() &&

      RecoverAlphaGeneric<xsimd::sse2>(blackSurf, whiteSurf)) {

    return true;

#endif

#ifdef MOZILLA_MAY_SUPPORT_NEON

  if (mozilla::supports_neon() &&

      RecoverAlphaGeneric<xsimd::neon>(blackSurf, whiteSurf)) {

    return true;

#endif

  blackSurf->Flush();

  whiteSurf->Flush();

  unsigned char* blackData = blackSurf->Data();

  unsigned char* whiteData = whiteSurf->Data();

  for (int32_t i = 0; i < size.height; ++i) {

    uint32_t* blackPixel = reinterpret_cast<uint32_t*>(blackData);

    const uint32_t* whitePixel = reinterpret_cast<uint32_t*>(whiteData);

    for (int32_t j = 0; j < size.width; ++j) {

      uint32_t recovered = RecoverPixel(blackPixel[j], whitePixel[j]);

      blackPixel[j] = recovered;

    blackData += blackSurf->Stride();

    whiteData += whiteSurf->Stride();

  blackSurf->MarkDirty();

  return true;