1 files changed, 76 insertions, 0 deletions
diff --git a/gfx/2d/ImageScaling.h b/gfx/2d/ImageScaling.h
new file mode 100644
index 000000000..56173b644
--- /dev/null
+++ b/gfx/2d/ImageScaling.h
@@ -0,0 +1,76 @@
+/* -*- 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/. */
+
+#ifndef _MOZILLA_GFX_IMAGESCALING_H
+#define _MOZILLA_GFX_IMAGESCALING_H
+
+#include "Types.h"
+
+#include <vector>
+#include "Point.h"
+
+namespace mozilla {
+namespace gfx {
+
+class ImageHalfScaler
+{
+public:
+  ImageHalfScaler(uint8_t *aData, int32_t aStride, const IntSize &aSize)
+    : mOrigData(aData), mOrigStride(aStride), mOrigSize(aSize)
+    , mDataStorage(nullptr)
+  {
+  }
+
+  ~ImageHalfScaler()
+  {
+    delete [] mDataStorage;
+  }
+
+  void ScaleForSize(const IntSize &aSize);
+
+  uint8_t *GetScaledData() const { return mData; }
+  IntSize GetSize() const { return mSize; }
+  uint32_t GetStride() const { return mStride; }
+
+private:
+  void HalfImage2D(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                   uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageVertical(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                         uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageHorizontal(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                           uint8_t *aDest, uint32_t aDestStride);
+
+  // This is our SSE2 scaling function. Our destination must always be 16-byte
+  // aligned and use a 16-byte aligned stride.
+  void HalfImage2D_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                        uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageVertical_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                              uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageHorizontal_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                                uint8_t *aDest, uint32_t aDestStride);
+
+  void HalfImage2D_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                     uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageVertical_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                           uint8_t *aDest, uint32_t aDestStride);
+  void HalfImageHorizontal_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,
+                             uint8_t *aDest, uint32_t aDestStride);
+
+  uint8_t *mOrigData;
+  int32_t mOrigStride;
+  IntSize mOrigSize;
+
+  uint8_t *mDataStorage;
+  // Guaranteed 16-byte aligned
+  uint8_t *mData;
+  IntSize mSize;
+  // Guaranteed 16-byte aligned
+  uint32_t mStride;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif