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Diffstat (limited to 'graphics/conversion.h')
-rw-r--r-- | graphics/conversion.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/graphics/conversion.h b/graphics/conversion.h new file mode 100644 index 0000000000..b0314046b9 --- /dev/null +++ b/graphics/conversion.h @@ -0,0 +1,76 @@ +/* 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. + * + * $URL$ + * $Id$ + * + */ + +#ifndef GRAPHICS_CONVERSION_H +#define GRAPHICS_CONVERSION_H + +#include "common/util.h" +#include "graphics/pixelformat.h" + +namespace Graphics { + +/** 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 dstbuf the buffer which will recieve the converted graphics data + * @param srcbuf 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 This implementation currently arbitrarily requires that the + * destination's format have at least as high a bytedepth as + * the source's. + * @note This can convert a rectangle in place, if the source and + * destination format have the same bytedepth. + * + */ +bool crossBlit(byte *dst, const byte *src, int dstpitch, int srcpitch, + int w, int h, Graphics::PixelFormat dstFmt, Graphics::PixelFormat srcFmt); + +} // end of namespace Graphics + +#endif // GRAPHICS_CONVERSION_H |