1 files changed, 51 insertions, 0 deletions
diff --git a/gfx/thebes/gfxAlphaRecovery.cpp b/gfx/thebes/gfxAlphaRecovery.cpp
new file mode 100644
index 0000000000..98a78ed3cb
--- /dev/null
+++ b/gfx/thebes/gfxAlphaRecovery.cpp
@@ -0,0 +1,51 @@
+/* -*- 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"
+
+/* 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() && RecoverAlphaSSE2(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;
+}