1 files changed, 54 insertions, 0 deletions
diff --git a/gfx/2d/ConvolutionFilter.h b/gfx/2d/ConvolutionFilter.h
new file mode 100644
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+++ b/gfx/2d/ConvolutionFilter.h
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+/* -*- 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_CONVOLUTION_FILTER_H_
+#define MOZILLA_GFX_CONVOLUTION_FILTER_H_
+
+#include "mozilla/UniquePtr.h"
+
+namespace skia {
+class SkConvolutionFilter1D;
+}
+
+namespace mozilla {
+namespace gfx {
+
+class ConvolutionFilter final {
+ public:
+  ConvolutionFilter();
+  ~ConvolutionFilter();
+
+  int32_t MaxFilter() const;
+  int32_t NumValues() const;
+
+  bool GetFilterOffsetAndLength(int32_t aRowIndex, int32_t* aResultOffset,
+                                int32_t* aResultLength);
+
+  void ConvolveHorizontally(const uint8_t* aSrc, uint8_t* aDst, bool aHasAlpha);
+  void ConvolveVertically(uint8_t* const* aSrc, uint8_t* aDst,
+                          int32_t aRowIndex, int32_t aRowSize, bool aHasAlpha);
+
+  enum class ResizeMethod { BOX, LANCZOS3 };
+
+  bool ComputeResizeFilter(ResizeMethod aResizeMethod, int32_t aSrcSize,
+                           int32_t aDstSize);
+
+  static inline size_t PadBytesForSIMD(size_t aBytes) {
+    return (aBytes + 31) & ~31;
+  }
+
+  const skia::SkConvolutionFilter1D& GetSkiaFilter() const {
+    return *mFilter.get();
+  }
+
+ private:
+  UniquePtr<skia::SkConvolutionFilter1D> mFilter;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_CONVOLUTION_FILTER_H_ */