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//
// Copyright 2013 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// copyimage.cpp: Defines image copying functions
#include "image_util/copyimage.h"
namespace angle
{
namespace
{
inline uint32_t SwizzleBGRAToRGBA(uint32_t argb)
{
return ((argb & 0x000000FF) << 16) | // Move BGRA blue to RGBA blue
((argb & 0x00FF0000) >> 16) | // Move BGRA red to RGBA red
((argb & 0xFF00FF00)); // Keep alpha and green
}
void CopyBGRA8ToRGBA8Fast(const uint8_t *source,
int srcYAxisPitch,
uint8_t *dest,
int destYAxisPitch,
int destWidth,
int destHeight)
{
for (int y = 0; y < destHeight; ++y)
{
const uint32_t *src32 = reinterpret_cast<const uint32_t *>(source + y * srcYAxisPitch);
uint32_t *dest32 = reinterpret_cast<uint32_t *>(dest + y * destYAxisPitch);
const uint32_t *end32 = src32 + destWidth;
while (src32 != end32)
{
*dest32++ = SwizzleBGRAToRGBA(*src32++);
}
}
}
} // namespace
void CopyBGRA8ToRGBA8(const uint8_t *source,
int srcXAxisPitch,
int srcYAxisPitch,
uint8_t *dest,
int destXAxisPitch,
int destYAxisPitch,
int destWidth,
int destHeight)
{
if (srcXAxisPitch == 4 && destXAxisPitch == 4)
{
CopyBGRA8ToRGBA8Fast(source, srcYAxisPitch, dest, destYAxisPitch, destWidth, destHeight);
return;
}
for (int y = 0; y < destHeight; ++y)
{
uint8_t *dst = dest + y * destYAxisPitch;
const uint8_t *src = source + y * srcYAxisPitch;
const uint8_t *end = src + destWidth * srcXAxisPitch;
while (src != end)
{
*reinterpret_cast<uint32_t *>(dst) =
SwizzleBGRAToRGBA(*reinterpret_cast<const uint32_t *>(src));
src += srcXAxisPitch;
dst += destXAxisPitch;
}
}
}
} // namespace angle
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