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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "graphics/conversion.h"
#include "graphics/pixelformat.h"
#include "common/endian.h"
namespace Graphics {
// TODO: YUV to RGB conversion function
namespace {
template<typename SrcColor, typename DstColor, bool backward>
inline void crossBlitLogic(byte *dst, const byte *src, const uint w, const uint h,
const PixelFormat &srcFmt, const PixelFormat &dstFmt,
const uint srcDelta, const uint dstDelta) {
for (uint y = 0; y < h; ++y) {
for (uint x = 0; x < w; ++x) {
const uint32 color = *(const SrcColor *)src;
byte a, r, g, b;
srcFmt.colorToARGB(color, a, r, g, b);
*(DstColor *)dst = dstFmt.ARGBToColor(a, r, g, b);
if (backward) {
src -= sizeof(SrcColor);
dst -= sizeof(DstColor);
} else {
src += sizeof(SrcColor);
dst += sizeof(DstColor);
}
}
if (backward) {
src -= srcDelta;
dst -= dstDelta;
} else {
src += srcDelta;
dst += dstDelta;
}
}
}
template<typename DstColor, bool backward>
inline void crossBlitLogic3BppSource(byte *dst, const byte *src, const uint w, const uint h,
const PixelFormat &srcFmt, const PixelFormat &dstFmt,
const uint srcDelta, const uint dstDelta) {
uint32 color;
byte r, g, b, a;
uint8 *col = (uint8 *)&color;
#ifdef SCUMM_BIG_ENDIAN
col++;
#endif
for (uint y = 0; y < h; ++y) {
for (uint x = 0; x < w; ++x) {
memcpy(col, src, 3);
srcFmt.colorToARGB(color, a, r, g, b);
*(DstColor *)dst = dstFmt.ARGBToColor(a, r, g, b);
if (backward) {
src -= 3;
dst -= sizeof(DstColor);
} else {
src += 3;
dst += sizeof(DstColor);
}
}
if (backward) {
src -= srcDelta;
dst -= dstDelta;
} else {
src += srcDelta;
dst += dstDelta;
}
}
}
} // End of anonymous namespace
// Function to blit a rect from one color format to another
bool crossBlit(byte *dst, const byte *src,
const uint dstPitch, const uint srcPitch,
const uint w, const uint h,
const Graphics::PixelFormat &dstFmt, const Graphics::PixelFormat &srcFmt) {
// Error out if conversion is impossible
if ((srcFmt.bytesPerPixel == 1) || (dstFmt.bytesPerPixel == 1)
|| (dstFmt.bytesPerPixel == 3)
|| (!srcFmt.bytesPerPixel) || (!dstFmt.bytesPerPixel))
return false;
// Don't perform unnecessary conversion
if (srcFmt == dstFmt) {
if (dst != src) {
if (dstPitch == srcPitch && ((w * dstFmt.bytesPerPixel) == dstPitch)) {
memcpy(dst, src, dstPitch * h);
} else {
for (uint i = 0; i < h; ++i) {
memcpy(dst, src, w * dstFmt.bytesPerPixel);
dst += dstPitch;
src += srcPitch;
}
}
}
return true;
}
// Faster, but larger, to provide optimized handling for each case.
const uint srcDelta = (srcPitch - w * srcFmt.bytesPerPixel);
const uint dstDelta = (dstPitch - w * dstFmt.bytesPerPixel);
// TODO: optimized cases for dstDelta of 0
if (dstFmt.bytesPerPixel == 2) {
if (srcFmt.bytesPerPixel == 2) {
crossBlitLogic<uint16, uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else if (srcFmt.bytesPerPixel == 3) {
crossBlitLogic3BppSource<uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else {
crossBlitLogic<uint32, uint16, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
}
} else if (dstFmt.bytesPerPixel == 4) {
if (srcFmt.bytesPerPixel == 2) {
// We need to blit the surface from bottom right to top left here.
// This is neeeded, because when we convert to the same memory
// buffer copying the surface from top left to bottom right would
// overwrite the source, since we have more bits per destination
// color than per source color.
dst += h * dstPitch - dstDelta - dstFmt.bytesPerPixel;
src += h * srcPitch - srcDelta - srcFmt.bytesPerPixel;
crossBlitLogic<uint16, uint32, true>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else if (srcFmt.bytesPerPixel == 3) {
// We need to blit the surface from bottom right to top left here.
// This is neeeded, because when we convert to the same memory
// buffer copying the surface from top left to bottom right would
// overwrite the source, since we have more bits per destination
// color than per source color.
dst += h * dstPitch - dstDelta - dstFmt.bytesPerPixel;
src += h * srcPitch - srcDelta - srcFmt.bytesPerPixel;
crossBlitLogic3BppSource<uint32, true>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
} else {
crossBlitLogic<uint32, uint32, false>(dst, src, w, h, srcFmt, dstFmt, srcDelta, dstDelta);
}
} else {
return false;
}
return true;
}
} // End of namespace Graphics
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