4 * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
5 * Copyright 1999 Bernardo Innocenti <bernie@develer.com>
6 * This file is part of DevLib - See README.devlib for information.
11 * \author Bernardo Innocenti <bernie@develer.com>
13 * \brief Graphics private header.
18 *#* Revision 1.6 2006/05/27 17:17:34 bernie
19 *#* Optimize away divisions in RAST_ADDR/MASK macros.
21 *#* Revision 1.5 2006/05/25 23:35:40 bernie
24 *#* Revision 1.4 2006/03/22 09:50:37 bernie
25 *#* Use the same format for fonts and rasters.
27 *#* Revision 1.3 2006/02/15 09:10:15 bernie
28 *#* Implement prop fonts; Fix algo styles.
30 *#* Revision 1.2 2006/02/10 12:28:33 bernie
31 *#* Add font support in bitmaps; Make bitmap formats public.
33 *#* Revision 1.1 2006/01/26 00:32:49 bernie
34 *#* Graphics private header.
43 #if CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_H_MSB
45 /* We use ucoord_t to let the compiler optimize away the division/modulo. */
46 #define RAST_ADDR(raster, x, y, stride) \
47 ((raster) + (ucoord_t)(y) * (ucoord_t)(stride) + (ucoord_t)(x) / 8)
48 #define RAST_MASK(raster, x, y) \
49 (1 << (7 - (ucoord_t)(x) % 8))
51 #elif CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_V_LSB
53 /* We use ucoord_t to let the compiler optimize away the division/modulo. */
54 #define RAST_ADDR(raster, x, y, stride) \
55 ((raster) + ((ucoord_t)(y) / 8) * (ucoord_t)(stride) + (ucoord_t)(x))
56 #define RAST_MASK(raster, x, y) \
57 (1 << ((ucoord_t)(y) % 8))
60 #error Unknown value of CONFIG_BITMAP_FMT
61 #endif /* CONFIG_BITMAP_FMT */
63 #define BM_ADDR(bm, x, y) RAST_ADDR((bm)->raster, (x), (y), (bm)->stride)
64 #define BM_MASK(bm, x, y) RAST_MASK((bm)->raster, (x), (y))
67 * Plot a pixel in bitmap \a bm.
69 * \note bm is evaluated twice.
70 * \see BM_CLEAR BM_DRAWPIXEL
72 #define BM_PLOT(bm, x, y) \
73 ( *BM_ADDR(bm, x, y) |= BM_MASK(bm, x, y) )
76 * Clear a pixel in bitmap \a bm.
78 * \note bm is evaluated twice.
79 * \see BM_PLOT BM_DRAWPIXEL
81 #define BM_CLEAR(bm, x, y) \
82 ( *BM_ADDR(bm, x, y) &= ~BM_MASK(bm, x, y) )
85 * Set a pixel in bitmap \a bm to the specified color.
87 * \note bm is evaluated twice.
88 * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
89 * \see BM_PLOT BM_CLEAR
91 #define BM_DRAWPIXEL(bm, x, y, fg_pen) \
93 uint8_t *p = BM_ADDR(bm, x, y); \
94 uint8_t mask = BM_MASK(bm, x, y); \
95 *p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
99 * Get the value of the pixel in bitmap \a bm.
101 * \return The returned value is either 0 or 1.
103 * \note bm is evaluated twice.
106 #define BM_READPIXEL(bm, x, y) \
107 ( *BM_ADDR(bm, x, y) & BM_MASK(bm, x, y) ? 1 : 0 )
109 #define RAST_READPIXEL(raster, x, y, stride) \
110 ( *RAST_ADDR(raster, x, y, stride) & RAST_MASK(raster, x, y) ? 1 : 0 )
112 #endif /* GFX_GFX_P_H */