gecko-dev/gfx/2d/Swizzle.h

/* -*- 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"

namespace mozilla {
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);

} // namespace gfx
} // namespace mozilla

#endif /* MOZILLA_GFX_SWIZZLE_H_ */