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 README.devlib for information.
11 * \author Bernardo Innocenti <bernie@develer.com>
12 * \author Stefano Fedrigo <aleph@develer.com>
14 * \brief General pourpose graphics routines
19 *#* Revision 1.14 2005/11/04 16:20:02 bernie
20 *#* Fix reference to README.devlib in header.
22 *#* Revision 1.13 2005/04/11 19:10:28 bernie
23 *#* Include top-level headers from cfg/ subdir.
25 *#* Revision 1.12 2005/03/01 23:26:45 bernie
26 *#* Use new CPU-neutral program-memory API.
28 *#* Revision 1.11 2004/12/08 08:06:16 bernie
31 *#* Revision 1.10 2004/11/01 15:14:07 bernie
32 *#* Update to current coding conventions.
34 *#* Revision 1.9 2004/10/21 10:58:33 bernie
37 *#* Revision 1.8 2004/09/20 03:29:22 bernie
40 *#* Revision 1.7 2004/09/14 21:01:08 bernie
41 *#* Rename rectangle drawing functions; Unify filled/cleared implementations.
43 *#* Revision 1.4 2004/08/24 16:53:10 bernie
44 *#* Use new-style config macros.
46 *#* Revision 1.3 2004/08/04 03:16:59 bernie
47 *#* Switch to new DevLib CONFIG_ convention.
49 *#* Revision 1.2 2004/06/03 11:27:09 bernie
50 *#* Add dual-license information.
54 #include <cfg/config.h> /* CONFIG_GFX_CLIPPING */
55 #include <cfg/debug.h>
56 #include <cfg/cpu.h> /* CPU_HARVARD */
57 #include <cfg/macros.h> /* SWAP() */
63 * Plot a point in bitmap \a bm.
65 * \note bm is evaluated twice
67 #define BM_PLOT(bm, x, y) \
68 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) |= 1 << ((y) % 8) )
71 * Clear a point in bitmap \a bm.
73 * \note bm is evaluated twice
75 #define BM_CLEAR(bm, x, y) \
76 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) &= ~(1 << ((y) % 8)) )
79 * Set a point in bitmap \a bm to the specified color.
81 * \note bm is evaluated twice
82 * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
83 * \see BM_PLOT BM_CLEAR
85 #define BM_DRAWPIXEL(bm, x, y, fg_pen) \
87 uint8_t *p = (bm)->raster + ((y) / 8) * (bm)->width + (x); \
88 uint8_t mask = 1 << ((y) % 8); \
89 *p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
93 * Initialize a Bitmap structure with the provided parameters.
95 * \note The pen position is reset to the origin.
97 void gfx_bitmapInit(Bitmap *bm, uint8_t *raster, coord_t w, coord_t h)
108 * Clear the whole bitmap surface to the background color.
110 * \note This function does \b not update the current pen position
112 void gfx_bitmapClear(Bitmap *bm)
114 memset(bm->raster, 0, (bm->width * bm->height) / 8);
120 #include <avr/pgmspace.h> /* FIXME: memcpy_P() */
123 * Copy a raster picture located in program memory in the bitmap.
124 * The size of the raster to copy *must* be the same of the raster bitmap.
126 * \note This function does \b not update the current pen position
128 void gfx_blit_P(Bitmap *bm, const pgm_uint8_t *raster)
130 memcpy_P(bm->raster, raster, (bm->height / 8) * bm->width);
132 #endif /* CPU_HARVARD */
136 * Draw a line on the bitmap \a bm using the specified start and end
139 * \note This function does \b not update the current pen position.
141 * \todo Optimize for vertical and horiziontal lines.
143 void gfx_line(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
145 int x, y, e, len, adx, ady, signx, signy;
148 #if CONFIG_GFX_CLIPPING
153 #define XMAX (bm->width - 1)
154 #define YMAX (bm->height - 1)
159 y1 = y2 - ((x2 - XMIN) * (y2 - y1)) / (x2 - x1);
164 x1 = x2 - ((y2 - YMIN) * (x2 - x1)) / (y2 - y1);
169 y2 = y2 - ((XMIN - x1) * (y2 - y1)) / (x2 - x1);
174 x2 = x2 - ((YMIN - y1) * (x2 - x1)) / (y2 - y1);
180 y1 = ((x2 - XMAX) * (y2 - y1)) / (x2 - x1);
185 x1 = ((y2 - YMAX) * (x2 - x1)) / (y2 - y1);
190 y2 = ((XMAX - x1) * (y2 - y1)) / (x2 - x1);
195 x2 = ((YMAX - y1) * (x2 - x1)) / (y2 - y1);
204 #endif /* CONFIG_GFX_CLIPPING */
238 /* X-major line (octants 1/4/5/8) */
245 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
258 /* Y-major line (octants 2/3/6/7) */
265 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
280 * Move the current pen position to the specified coordinates.
282 void gfx_moveTo(Bitmap *bm, coord_t x, coord_t y)
289 * Draw a line from the current pen position to the new coordinates.
291 * \note This function moves the current pen position to the
294 void gfx_lineTo(Bitmap *bm, coord_t x, coord_t y)
296 gfx_line(bm, bm->penX, bm->penY, x, y);
297 gfx_moveTo(bm, x, y);
302 * Draw an the outline of an hollow rectangle.
304 * \note The bottom-right border of the rectangle is not drawn.
305 * \note This function does \b not update the current pen position
307 void gfx_rectDraw(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
309 /* Sort coords (needed for correct bottom-right semantics) */
310 if (x1 > x2) SWAP(x1, x2);
311 if (y1 > y2) SWAP(y1, y2);
314 gfx_line(bm, x1, y1, x2-1, y1);
315 gfx_line(bm, x2-1, y1, x2-1, y2-1);
316 gfx_line(bm, x2-1, y2-1, x1, y2-1);
317 gfx_line(bm, x1, y2-1, x1, y1);
322 * Fill a rectangular area with \a color.
324 * \note The bottom-right border of the rectangle is not drawn.
326 * \note This function does \b not update the current pen position
328 void gfx_rectFillC(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2, uint8_t color)
333 if (x1 > x2) SWAP(x1, x2);
334 if (y1 > y2) SWAP(y1, y2);
336 /* Clip rect to bitmap bounds */
339 if (x1 > bm->width) x1 = bm->width;
340 if (x2 > bm->width) x2 = bm->width;
343 if (y1 > bm->width) y1 = bm->width;
344 if (y2 > bm->width) y2 = bm->width;
348 * NOTE: Code paths are duplicated for efficiency
350 if (color) /* fill */
352 for (x = x1; x < x2; x++)
353 for (y = y1; y < y2; y++)
358 for (x = x1; x < x2; x++)
359 for (y = y1; y < y2; y++)
366 * Draw a filled rectangle.
368 * \note The bottom-right border of the rectangle is not drawn.
370 * \note This function does \b not update the current pen position
372 void gfx_rectFill(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
374 gfx_rectFillC(bm, x1, y1, x2, y2, 0xFF);
379 * Clear a rectangular area.
381 * \note The bottom-right border of the rectangle is not drawn.
383 * \note This function does \b not update the current pen position
385 void gfx_rectClear(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
387 gfx_rectFillC(bm, x1, y1, x2, y2, 0x00);
392 * Imposta un rettangolo di clipping per il disegno nella bitmap.
394 void gfx_setClipRect(Bitmap *bm, coord_t minx, coord_t miny, coord_t maxx, coord_t maxy)
400 ASSERT(maxx <= bm->width);
401 ASSERT(maxy <= bm->height);
408 /* DB(kprintf("cr.xmin = %d, cr.ymin = %d, cr.xmax = %d, cr.ymax = %d\n",
409 bm->cr.xMin, bm->cr.ymin, bm->cr.xmax, bm->cr.ymax);)
414 #if CONFIG_GFX_VCOORDS
416 * Imposta gli estremi del sistema di coordinate cartesiane rispetto
417 * al rettangolo di clipping della bitmap.
419 void gfx_setViewRect(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
426 bm->scaleX = (vcoord_t)(bm->cr.xmax - bm->cr.xmin - 1) / (vcoord_t)(x2 - x1);
427 bm->scaleY = (vcoord_t)(bm->cr.ymax - bm->cr.ymin - 1) / (vcoord_t)(y2 - y1);
429 /* DB(kprintf("orgX = %f, orgY = %f, scaleX = %f, scaleY = %f\n",
430 bm->orgX, bm->orgY, bm->scaleX, bm->scaleY);)
436 * Transform a coordinate from the current reference system to a
437 * pixel offset within the bitmap.
439 coord_t gfx_transformX(Bitmap *bm, vcoord_t x)
441 return bm->cr.xmin + (coord_t)((x - bm->orgX) * bm->scaleX);
445 * Transform a coordinate from the current reference system to a
446 * pixel offset within the bitmap.
448 coord_t gfx_transformY(Bitmap *bm, vcoord_t y)
450 return bm->cr.ymin + (coord_t)((y - bm->orgY) * bm->scaleY);
455 * Draw a line from (x1;y1) to (x2;y2).
457 void gfx_vline(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
460 gfx_transformX(bm, x1), gfx_transformY(bm, y1),
461 gfx_transformY(bm, x2), gfx_transformY(bm, y2));
463 #endif /* CONFIG_GFX_VCOORDS */