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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.
*
*/
#ifndef GRAPHICS_CONVERSION_H
#define GRAPHICS_CONVERSION_H
#include "common/util.h"
namespace Graphics {
struct PixelFormat;
/** Converting a color from YUV to RGB colorspace. */
inline static void YUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
r = CLIP<int>(y + ((1357 * (v - 128)) >> 10), 0, 255);
g = CLIP<int>(y - (( 691 * (v - 128)) >> 10) - ((333 * (u - 128)) >> 10), 0, 255);
b = CLIP<int>(y + ((1715 * (u - 128)) >> 10), 0, 255);
}
/** Converting a color from RGB to YUV colorspace. */
inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
y = CLIP<int>( ((r * 306) >> 10) + ((g * 601) >> 10) + ((b * 117) >> 10) , 0, 255);
u = CLIP<int>(-((r * 172) >> 10) - ((g * 340) >> 10) + ((b * 512) >> 10) + 128, 0, 255);
v = CLIP<int>( ((r * 512) >> 10) - ((g * 429) >> 10) - ((b * 83) >> 10) + 128, 0, 255);
}
// TODO: generic YUV to RGB blit
/**
* Blits a rectangle from one graphical format to another.
*
* @param dst the buffer which will recieve the converted graphics data
* @param src the buffer containing the original graphics data
* @param dstPitch width in bytes of one full line of the dest buffer
* @param srcPitch width in bytes of one full line of the source buffer
* @param w the width of the graphics data
* @param h the height of the graphics data
* @param dstFmt the desired pixel format
* @param srcFmt the original pixel format
* @return true if conversion completes successfully,
* false if there is an error.
*
* @note Blitting to a 3Bpp destination is not supported
* @note This can convert a surface in place, regardless of the
* source and destination format, as long as there is enough
* space for the destination. The dstPitch / srcPitch ratio
* must at least equal the dstBpp / srcBpp ratio for
* dstPitch >= srcPitch and at most dstBpp / srcBpp for
* dstPitch < srcPitch though.
*/
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);
} // End of namespace Graphics
#endif // GRAPHICS_CONVERSION_H
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