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bertos/gfx/gfx_p.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999 Bernie Innocenti <bernie@codewiz.org>
+ *
+ * -->
+ *
+ *
+ * \author Bernie Innocenti <bernie@codewiz.org>
+ *
+ * \brief Graphics private header.
+ */
+
+/*#*
+ *#* $Log$
+ *#* Revision 1.7  2006/07/19 12:56:26  bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* Revision 1.6  2006/05/27 17:17:34  bernie
+ *#* Optimize away divisions in RAST_ADDR/MASK macros.
+ *#*
+ *#* Revision 1.5  2006/05/25 23:35:40  bernie
+ *#* Cleanup.
+ *#*
+ *#* Revision 1.4  2006/03/22 09:50:37  bernie
+ *#* Use the same format for fonts and rasters.
+ *#*
+ *#* Revision 1.3  2006/02/15 09:10:15  bernie
+ *#* Implement prop fonts; Fix algo styles.
+ *#*
+ *#* Revision 1.2  2006/02/10 12:28:33  bernie
+ *#* Add font support in bitmaps; Make bitmap formats public.
+ *#*
+ *#* Revision 1.1  2006/01/26 00:32:49  bernie
+ *#* Graphics private header.
+ *#*
+ *#*/
+
+#ifndef GFX_GFX_P_H
+#define GFX_GFX_P_H
+
+#include <gfx/gfx.h>
+
+#if CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_H_MSB
+
+	/* We use ucoord_t to let the compiler optimize away the division/modulo. */
+	#define RAST_ADDR(raster, x, y, stride) \
+			((raster) + (ucoord_t)(y) * (ucoord_t)(stride) + (ucoord_t)(x) / 8)
+	#define RAST_MASK(raster, x, y) \
+			(1 << (7 - (ucoord_t)(x) % 8))
+
+#elif CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_V_LSB
+
+	/* We use ucoord_t to let the compiler optimize away the division/modulo. */
+	#define RAST_ADDR(raster, x, y, stride) \
+			((raster) + ((ucoord_t)(y) / 8) * (ucoord_t)(stride) + (ucoord_t)(x))
+	#define RAST_MASK(raster, x, y) \
+			(1 << ((ucoord_t)(y) % 8))
+
+#else
+	#error Unknown value of CONFIG_BITMAP_FMT
+#endif /* CONFIG_BITMAP_FMT */
+
+#define BM_ADDR(bm, x, y)  RAST_ADDR((bm)->raster, (x), (y), (bm)->stride)
+#define BM_MASK(bm, x, y)  RAST_MASK((bm)->raster, (x), (y))
+
+/**
+ * Plot a pixel in bitmap \a bm.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_CLEAR BM_DRAWPIXEL
+ */
+#define BM_PLOT(bm, x, y) \
+	( *BM_ADDR(bm, x, y) |= BM_MASK(bm, x, y) )
+
+/**
+ * Clear a pixel in bitmap \a bm.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_PLOT BM_DRAWPIXEL
+ */
+#define BM_CLEAR(bm, x, y) \
+	( *BM_ADDR(bm, x, y) &= ~BM_MASK(bm, x, y) )
+
+/**
+ * Set a pixel in bitmap \a bm to the specified color.
+ *
+ * \note bm is evaluated twice.
+ * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
+ * \see BM_PLOT BM_CLEAR
+ */
+#define BM_DRAWPIXEL(bm, x, y, fg_pen) \
+	do { \
+		uint8_t *p = BM_ADDR(bm, x, y); \
+		uint8_t mask = BM_MASK(bm, x, y); \
+		*p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
+	} while (0)
+
+/**
+ * Get the value of the pixel in bitmap \a bm.
+ *
+ * \return The returned value is either 0 or 1.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_DRAWPIXEL
+ */
+#define BM_READPIXEL(bm, x, y) \
+	( *BM_ADDR(bm, x, y) & BM_MASK(bm, x, y) ? 1 : 0 )
+
+#define RAST_READPIXEL(raster, x, y, stride) \
+		( *RAST_ADDR(raster, x, y, stride) & RAST_MASK(raster, x, y) ? 1 : 0 )
+
+#endif /* GFX_GFX_P_H */