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78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef GRAPHICS_CONVERSION_H
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#define GRAPHICS_CONVERSION_H
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#include "common/util.h"
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namespace Graphics {
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struct PixelFormat;
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/** Converting a color from YUV to RGB colorspace. */
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inline static void YUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
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r = CLIP<int>(y + ((1357 * (v - 128)) >> 10), 0, 255);
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g = CLIP<int>(y - (( 691 * (v - 128)) >> 10) - ((333 * (u - 128)) >> 10), 0, 255);
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b = CLIP<int>(y + ((1715 * (u - 128)) >> 10), 0, 255);
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}
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/** Converting a color from RGB to YUV colorspace. */
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inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
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y = CLIP<int>( ((r * 306) >> 10) + ((g * 601) >> 10) + ((b * 117) >> 10) , 0, 255);
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u = CLIP<int>(-((r * 172) >> 10) - ((g * 340) >> 10) + ((b * 512) >> 10) + 128, 0, 255);
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v = CLIP<int>( ((r * 512) >> 10) - ((g * 429) >> 10) - ((b * 83) >> 10) + 128, 0, 255);
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}
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// TODO: generic YUV to RGB blit
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/**
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* Blits a rectangle from one graphical format to another.
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*
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* @param dst the buffer which will recieve the converted graphics data
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* @param src the buffer containing the original graphics data
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* @param dstPitch width in bytes of one full line of the dest buffer
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* @param srcPitch width in bytes of one full line of the source buffer
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* @param w the width of the graphics data
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* @param h the height of the graphics data
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* @param dstFmt the desired pixel format
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* @param srcFmt the original pixel format
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* @return true if conversion completes successfully,
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* false if there is an error.
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*
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* @note Blitting to a 3Bpp destination is not supported
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* @note This can convert a surface in place, regardless of the
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* source and destination format, as long as there is enough
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* space for the destination. The dstPitch / srcPitch ratio
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* must at least equal the dstBpp / srcBpp ratio for
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* dstPitch >= srcPitch and at most dstBpp / srcBpp for
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* dstPitch < srcPitch though.
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*/
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bool crossBlit(byte *dst, const byte *src,
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const uint dstPitch, const uint srcPitch,
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const uint w, const uint h,
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const Graphics::PixelFormat &dstFmt, const Graphics::PixelFormat &srcFmt);
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} // End of namespace Graphics
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#endif // GRAPHICS_CONVERSION_H
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