1 files changed, 84 insertions, 0 deletions
diff --git a/gfx/2d/ImageScaling.h b/gfx/2d/ImageScaling.h
new file mode 100644
index 0000000000..446b5287c6
--- /dev/null
+++ b/gfx/2d/ImageScaling.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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),
+        mData(nullptr),
+        mStride(0) {}
+
+  ~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