1 files changed, 112 insertions, 0 deletions
diff --git a/gfx/2d/Swizzle.h b/gfx/2d/Swizzle.h
new file mode 100644
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+++ b/gfx/2d/Swizzle.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_SWIZZLE_H_
+#define MOZILLA_GFX_SWIZZLE_H_
+
+#include "Point.h"
+#include "Rect.h"
+
+namespace mozilla {
+namespace image {
+struct Orientation;
+}
+
+namespace gfx {
+
+/**
+ * Premultiplies source and writes it to destination. Source and destination may
+ * be the same to premultiply in-place. The source format must have an alpha
+ * channel.
+ */
+GFX2D_API bool PremultiplyData(const uint8_t* aSrc, int32_t aSrcStride,
+                               SurfaceFormat aSrcFormat, uint8_t* aDst,
+                               int32_t aDstStride, SurfaceFormat aDstFormat,
+                               const IntSize& aSize);
+
+/**
+ * Unpremultiplies source and writes it to destination. Source and destination
+ * may be the same to unpremultiply in-place. Both the source and destination
+ * formats must have an alpha channel.
+ */
+GFX2D_API bool UnpremultiplyData(const uint8_t* aSrc, int32_t aSrcStride,
+                                 SurfaceFormat aSrcFormat, uint8_t* aDst,
+                                 int32_t aDstStride, SurfaceFormat aDstFormat,
+                                 const IntSize& aSize);
+
+/**
+ * Swizzles source and writes it to destination. Source and destination may be
+ * the same to swizzle in-place.
+ */
+GFX2D_API bool SwizzleData(const uint8_t* aSrc, int32_t aSrcStride,
+                           SurfaceFormat aSrcFormat, uint8_t* aDst,
+                           int32_t aDstStride, SurfaceFormat aDstFormat,
+                           const IntSize& aSize);
+
+/**
+ * Flips rows of source and swizzles it to destination. Source and destination
+ * may be the same to swizzle in-place; this will fail if it cannot allocate a
+ * temporary buffer.
+ */
+GFX2D_API bool SwizzleYFlipData(const uint8_t* aSrc, int32_t aSrcStride,
+                                SurfaceFormat aSrcFormat, uint8_t* aDst,
+                                int32_t aDstStride, SurfaceFormat aDstFormat,
+                                const IntSize& aSize);
+
+/**
+ * Flips rows of source and premultiplies/swizzles it to destination. Source and
+ * destination may be the same to premultiply/swizzle in-place; this will fail
+ * if it cannot allocate a temporary buffer.
+ */
+GFX2D_API bool PremultiplyYFlipData(const uint8_t* aSrc, int32_t aSrcStride,
+                                    SurfaceFormat aSrcFormat, uint8_t* aDst,
+                                    int32_t aDstStride,
+                                    SurfaceFormat aDstFormat,
+                                    const IntSize& aSize);
+
+/**
+ * Swizzles source and writes it to destination. Source and destination may be
+ * the same to swizzle in-place.
+ */
+typedef void (*SwizzleRowFn)(const uint8_t* aSrc, uint8_t* aDst,
+                             int32_t aLength);
+
+/**
+ * Get a function pointer to perform premultiplication between two formats.
+ */
+GFX2D_API SwizzleRowFn PremultiplyRow(SurfaceFormat aSrcFormat,
+                                      SurfaceFormat aDstFormat);
+
+/**
+ * Get a function pointer to perform unpremultiplication between two formats.
+ */
+GFX2D_API SwizzleRowFn UnpremultiplyRow(SurfaceFormat aSrcFormat,
+                                        SurfaceFormat aDstFormat);
+
+/**
+ * Get a function pointer to perform swizzling between two formats.
+ */
+GFX2D_API SwizzleRowFn SwizzleRow(SurfaceFormat aSrcFormat,
+                                  SurfaceFormat aDstFormat);
+
+/**
+ * Reorients source and writes it to destination. Returns the dirty rect of
+ * what was changed in aDst.
+ */
+typedef IntRect (*ReorientRowFn)(const uint8_t* aSrc, int32_t aSrcRow,
+                                 uint8_t* aDst, const IntSize& aDstSize,
+                                 int32_t aDstStride);
+
+/**
+ * Get a function pointer to perform reorientation by row.
+ */
+GFX2D_API ReorientRowFn
+ReorientRow(const struct image::Orientation& aOrientation);
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_SWIZZLE_H_ */