add conversion.h and conversion.cpp into trunk (were present in working copy, but not added to svn control)

svn-id: r43582

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