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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.
*
* $URL$
* $Id$
*/
#include "graphics/conversion.h"
namespace Graphics {
// TODO: YUV to RGB conversion function
// Function to blit a rect from one color format to another
bool crossBlit(byte *dst, const byte *src, int dstpitch, int srcpitch,
int w, int h, const Graphics::PixelFormat &dstFmt, const Graphics::PixelFormat &srcFmt) {
// Error out if conversion is impossible
if ((srcFmt.bytesPerPixel == 1) || (dstFmt.bytesPerPixel == 1)
|| (!srcFmt.bytesPerPixel) || (!dstFmt.bytesPerPixel)
|| (srcFmt.bytesPerPixel > dstFmt.bytesPerPixel))
return false;
// Don't perform unnecessary conversion
if (srcFmt == dstFmt) {
if (dst == src)
return true;
if (dstpitch == srcpitch && ((w * dstFmt.bytesPerPixel) == dstpitch)) {
memcpy(dst,src,dstpitch * h);
return true;
} else {
for (int 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.
int srcDelta, dstDelta;
srcDelta = (srcpitch - w * srcFmt.bytesPerPixel);
dstDelta = (dstpitch - w * dstFmt.bytesPerPixel);
// TODO: optimized cases for dstDelta of 0
uint8 r, g, b, a;
if (dstFmt.bytesPerPixel == 2) {
uint16 color;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 2) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint16 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else if (dstFmt.bytesPerPixel == 3) {
uint32 color;
uint8 *col = (uint8 *) &color;
#ifdef SCUMM_BIG_ENDIAN
col++;
#endif
if (srcFmt.bytesPerPixel == 2) {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 3) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
memcpy(dst, col, 3);
}
src += srcDelta;
dst += dstDelta;
}
} else {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 3, dst += 3) {
memcpy(col, src, 3);
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
memcpy(dst, col, 3);
}
src += srcDelta;
dst += dstDelta;
}
}
} else if (dstFmt.bytesPerPixel == 4) {
uint32 color;
if (srcFmt.bytesPerPixel == 2) {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 4) {
color = *(uint16 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else if (srcFmt.bytesPerPixel == 3) {
uint8 *col = (uint8 *)&color;
#ifdef SCUMM_BIG_ENDIAN
col++;
#endif
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 2, dst += 4) {
memcpy(col, src, 3);
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
} else {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++, src += 4, dst += 4) {
color = *(uint32 *) src;
srcFmt.colorToARGB(color, a, r, g, b);
color = dstFmt.ARGBToColor(a, r, g, b);
*(uint32 *) dst = color;
}
src += srcDelta;
dst += dstDelta;
}
}
} else {
return false;
}
return true;
}
} // End of namespace Graphics
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