4 * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
5 * Copyright 1999 Bernardo Innocenti <bernie@develer.com>
6 * This file is part of DevLib - See devlib/README for information.
11 * \author Bernardo Innocenti <bernie@develer.com>
12 * \author Stefano Fedrigo <aleph@develer.com>
14 * \brief General pourpose graphics routines
19 *#* Revision 1.11 2004/12/08 08:06:16 bernie
22 *#* Revision 1.10 2004/11/01 15:14:07 bernie
23 *#* Update to current coding conventions.
25 *#* Revision 1.9 2004/10/21 10:58:33 bernie
28 *#* Revision 1.8 2004/09/20 03:29:22 bernie
31 *#* Revision 1.7 2004/09/14 21:01:08 bernie
32 *#* Rename rectangle drawing functions; Unify filled/cleared implementations.
34 *#* Revision 1.4 2004/08/24 16:53:10 bernie
35 *#* Use new-style config macros.
37 *#* Revision 1.3 2004/08/04 03:16:59 bernie
38 *#* Switch to new DevLib CONFIG_ convention.
40 *#* Revision 1.2 2004/06/03 11:27:09 bernie
41 *#* Add dual-license information.
45 #include "config.h" /* CONFIG_GFX_CLIPPING */
47 #include <cpu.h> /* CPU_HARVARD */
48 #include <macros.h> /* SWAP() */
54 * Plot a point in bitmap \a bm.
56 * \note bm is evaluated twice
58 #define BM_PLOT(bm, x, y) \
59 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) |= 1 << ((y) % 8) )
62 * Clear a point in bitmap \a bm.
64 * \note bm is evaluated twice
66 #define BM_CLEAR(bm, x, y) \
67 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) &= ~(1 << ((y) % 8)) )
70 * Set a point in bitmap \a bm to the specified color.
72 * \note bm is evaluated twice
73 * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
74 * \see BM_PLOT BM_CLEAR
76 #define BM_DRAWPIXEL(bm, x, y, fg_pen) \
78 uint8_t *p = (bm)->raster + ((y) / 8) * (bm)->width + (x); \
79 uint8_t mask = 1 << ((y) % 8); \
80 *p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
84 * Initialize a Bitmap structure with the provided parameters.
86 * \note The pen position is reset to the origin.
88 void gfx_bitmapInit(Bitmap *bm, uint8_t *raster, coord_t w, coord_t h)
99 * Clear the whole bitmap surface to the background color.
101 * \note This function does \b not update the current pen position
103 void gfx_bitmapClear(Bitmap *bm)
105 memset(bm->raster, 0, (bm->width * bm->height) / 8);
111 * Copy a raster picture located in program memory in the bitmap.
112 * The size of the raster to copy *must* be the same of the raster bitmap.
114 * \note This function does \b not update the current pen position
116 void gfx_blit_P(Bitmap *bm, const prog_uchar *raster)
118 memcpy_P(bm->raster, raster, (bm->height / 8) * bm->width);
120 #endif /* CPU_HARVARD */
124 * Draw a line on the bitmap \a bm using the specified start and end
127 * \note This function does \b not update the current pen position.
129 * \todo Optimize for vertical and horiziontal lines.
131 void gfx_line(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
133 int x, y, e, len, adx, ady, signx, signy;
136 #if CONFIG_GFX_CLIPPING
141 #define XMAX (bm->width - 1)
142 #define YMAX (bm->height - 1)
147 y1 = y2 - ((x2 - XMIN) * (y2 - y1)) / (x2 - x1);
152 x1 = x2 - ((y2 - YMIN) * (x2 - x1)) / (y2 - y1);
157 y2 = y2 - ((XMIN - x1) * (y2 - y1)) / (x2 - x1);
162 x2 = x2 - ((YMIN - y1) * (x2 - x1)) / (y2 - y1);
168 y1 = ((x2 - XMAX) * (y2 - y1)) / (x2 - x1);
173 x1 = ((y2 - YMAX) * (x2 - x1)) / (y2 - y1);
178 y2 = ((XMAX - x1) * (y2 - y1)) / (x2 - x1);
183 x2 = ((YMAX - y1) * (x2 - x1)) / (y2 - y1);
192 #endif /* CONFIG_GFX_CLIPPING */
226 /* X-major line (octants 1/4/5/8) */
233 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
246 /* Y-major line (octants 2/3/6/7) */
253 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
268 * Move the current pen position to the specified coordinates.
270 void gfx_moveTo(Bitmap *bm, coord_t x, coord_t y)
277 * Draw a line from the current pen position to the new coordinates.
279 * \note This function moves the current pen position to the
282 void gfx_lineTo(Bitmap *bm, coord_t x, coord_t y)
284 gfx_line(bm, bm->penX, bm->penY, x, y);
285 gfx_moveTo(bm, x, y);
290 * Draw an the outline of an hollow rectangle.
292 * \note The bottom-right border of the rectangle is not drawn.
293 * \note This function does \b not update the current pen position
295 void gfx_rectDraw(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
297 /* Sort coords (needed for correct bottom-right semantics) */
298 if (x1 > x2) SWAP(x1, x2);
299 if (y1 > y2) SWAP(y1, y2);
302 gfx_line(bm, x1, y1, x2-1, y1);
303 gfx_line(bm, x2-1, y1, x2-1, y2-1);
304 gfx_line(bm, x2-1, y2-1, x1, y2-1);
305 gfx_line(bm, x1, y2-1, x1, y1);
310 * Fill a rectangular area with \a color.
312 * \note The bottom-right border of the rectangle is not drawn.
314 * \note This function does \b not update the current pen position
316 void gfx_rectFillC(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2, uint8_t color)
321 if (x1 > x2) SWAP(x1, x2);
322 if (y1 > y2) SWAP(y1, y2);
324 /* Clip rect to bitmap bounds */
327 if (x1 > bm->width) x1 = bm->width;
328 if (x2 > bm->width) x2 = bm->width;
331 if (y1 > bm->width) y1 = bm->width;
332 if (y2 > bm->width) y2 = bm->width;
336 * NOTE: Code paths are duplicated for efficiency
338 if (color) /* fill */
340 for (x = x1; x < x2; x++)
341 for (y = y1; y < y2; y++)
346 for (x = x1; x < x2; x++)
347 for (y = y1; y < y2; y++)
354 * Draw a filled rectangle.
356 * \note The bottom-right border of the rectangle is not drawn.
358 * \note This function does \b not update the current pen position
360 void gfx_rectFill(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
362 gfx_rectFillC(bm, x1, y1, x2, y2, 0xFF);
367 * Clear a rectangular area.
369 * \note The bottom-right border of the rectangle is not drawn.
371 * \note This function does \b not update the current pen position
373 void gfx_rectClear(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
375 gfx_rectFillC(bm, x1, y1, x2, y2, 0x00);
380 * Imposta un rettangolo di clipping per il disegno nella bitmap.
382 void gfx_setClipRect(Bitmap *bm, coord_t minx, coord_t miny, coord_t maxx, coord_t maxy)
388 ASSERT(maxx <= bm->width);
389 ASSERT(maxy <= bm->height);
396 /* DB(kprintf("cr.xmin = %d, cr.ymin = %d, cr.xmax = %d, cr.ymax = %d\n",
397 bm->cr.xMin, bm->cr.ymin, bm->cr.xmax, bm->cr.ymax);)
402 #if CONFIG_GFX_VCOORDS
404 * Imposta gli estremi del sistema di coordinate cartesiane rispetto
405 * al rettangolo di clipping della bitmap.
407 void gfx_setViewRect(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
414 bm->scaleX = (vcoord_t)(bm->cr.xmax - bm->cr.xmin - 1) / (vcoord_t)(x2 - x1);
415 bm->scaleY = (vcoord_t)(bm->cr.ymax - bm->cr.ymin - 1) / (vcoord_t)(y2 - y1);
417 /* DB(kprintf("orgX = %f, orgY = %f, scaleX = %f, scaleY = %f\n",
418 bm->orgX, bm->orgY, bm->scaleX, bm->scaleY);)
424 * Transform a coordinate from the current reference system to a
425 * pixel offset within the bitmap.
427 coord_t gfx_transformX(Bitmap *bm, vcoord_t x)
429 return bm->cr.xmin + (coord_t)((x - bm->orgX) * bm->scaleX);
433 * Transform a coordinate from the current reference system to a
434 * pixel offset within the bitmap.
436 coord_t gfx_transformY(Bitmap *bm, vcoord_t y)
438 return bm->cr.ymin + (coord_t)((y - bm->orgY) * bm->scaleY);
443 * Draw a line from (x1;y1) to (x2;y2).
445 void gfx_vline(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
448 gfx_transformX(bm, x1), gfx_transformY(bm, y1),
449 gfx_transformY(bm, x2), gfx_transformY(bm, y2));
451 #endif /* CONFIG_GFX_VCOORDS */