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
16 * \todo Rename functions to match the coding-standard.
21 *#* Revision 1.10 2004/11/01 15:14:07 bernie
22 *#* Update to current coding conventions.
24 *#* Revision 1.9 2004/10/21 10:58:33 bernie
27 *#* Revision 1.8 2004/09/20 03:29:22 bernie
30 *#* Revision 1.7 2004/09/14 21:01:08 bernie
31 *#* Rename rectangle drawing functions; Unify filled/cleared implementations.
33 *#* Revision 1.4 2004/08/24 16:53:10 bernie
34 *#* Use new-style config macros.
36 *#* Revision 1.3 2004/08/04 03:16:59 bernie
37 *#* Switch to new DevLib CONFIG_ convention.
39 *#* Revision 1.2 2004/06/03 11:27:09 bernie
40 *#* Add dual-license information.
44 #include "config.h" /* CONFIG_GFX_CLIPPING */
46 #include <cpu.h> /* CPU_HARVARD */
47 #include <macros.h> /* SWAP() */
53 * Plot a point in bitmap \a bm.
55 * \note bm is evaluated twice
57 #define BM_PLOT(bm, x, y) \
58 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) |= 1 << ((y) % 8) )
61 * Clear a point in bitmap \a bm.
63 * \note bm is evaluated twice
65 #define BM_CLEAR(bm, x, y) \
66 ( *((bm)->raster + ((y) / 8) * (bm)->width + (x)) &= ~(1 << ((y) % 8)) )
69 * Set a point in bitmap \a bm to the specified color.
71 * \note bm is evaluated twice
72 * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
73 * \see BM_PLOT BM_CLEAR
75 #define BM_DRAWPIXEL(bm, x, y, fg_pen) \
77 uint8_t *p = (bm)->raster + ((y) / 8) * (bm)->width + (x); \
78 uint8_t mask = 1 << ((y) % 8); \
79 *p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
83 * Initialize a Bitmap structure with the provided parameters.
85 * \note The pen position is reset to the origin.
87 void gfx_bitmapInit(Bitmap *bm, uint8_t *raster, coord_t w, coord_t h)
98 * Clear the whole bitmap surface to the background color.
100 * \note This function does \b not update the current pen position
102 void gfx_bitmapClear(Bitmap *bm)
104 memset(bm->raster, 0, (bm->width * bm->height) / 8);
110 * Copy a raster picture located in program memory in the bitmap.
111 * The size of the raster to copy *must* be the same of the raster bitmap.
113 * \note This function does \b not update the current pen position
115 void gfx_blit_P(Bitmap *bm, const prog_uchar *raster)
117 memcpy_P(bm->raster, raster, (bm->height / 8) * bm->width);
119 #endif /* CPU_HARVARD */
123 * Draw a line on the bitmap \a bm using the specified start and end
126 * \note This function does \b not update the current pen position.
128 * \todo Optimize for vertical and horiziontal lines.
130 void gfx_line(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
132 int x, y, e, len, adx, ady, signx, signy;
135 #if CONFIG_GFX_CLIPPING
140 #define XMAX (bm->width - 1)
141 #define YMAX (bm->height - 1)
146 y1 = y2 - ((x2 - XMIN) * (y2 - y1)) / (x2 - x1);
151 x1 = x2 - ((y2 - YMIN) * (x2 - x1)) / (y2 - y1);
156 y2 = y2 - ((XMIN - x1) * (y2 - y1)) / (x2 - x1);
161 x2 = x2 - ((YMIN - y1) * (x2 - x1)) / (y2 - y1);
167 y1 = ((x2 - XMAX) * (y2 - y1)) / (x2 - x1);
172 x1 = ((y2 - YMAX) * (x2 - x1)) / (y2 - y1);
177 y2 = ((XMAX - x1) * (y2 - y1)) / (x2 - x1);
182 x2 = ((YMAX - y1) * (x2 - x1)) / (y2 - y1);
191 #endif /* CONFIG_GFX_CLIPPING */
225 /* X-major line (octants 1/4/5/8) */
232 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
245 /* Y-major line (octants 2/3/6/7) */
252 if ((x >= 0) && (x < bm->width) && (y >= 0) && (y < bm->height))
267 * Move the current pen position to the specified coordinates.
269 void gfx_moveTo(Bitmap *bm, coord_t x, coord_t y)
276 * Draw a line from the current pen position to the new coordinates.
278 * \note This function moves the current pen position to the
281 void gfx_lineTo(Bitmap *bm, coord_t x, coord_t y)
283 gfx_line(bm, bm->penX, bm->penY, x, y);
284 gfx_moveTo(bm, x, y);
289 * Draw an the outline of an hollow rectangle.
291 * \note The bottom-right border of the rectangle is not drawn.
292 * \note This function does \b not update the current pen position
294 void gfx_rectDraw(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
296 /* Sort coords (needed for correct bottom-right semantics) */
297 if (x1 > x2) SWAP(x1, x2);
298 if (y1 > y2) SWAP(y1, y2);
301 gfx_line(bm, x1, y1, x2-1, y1);
302 gfx_line(bm, x2-1, y1, x2-1, y2-1);
303 gfx_line(bm, x2-1, y2-1, x1, y2-1);
304 gfx_line(bm, x1, y2-1, x1, y1);
309 * Fill a rectangular area with \a color.
311 * \note The bottom-right border of the rectangle is not drawn.
313 * \note This function does \b not update the current pen position
315 void gfx_rectFillC(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2, uint8_t color)
320 if (x1 > x2) SWAP(x1, x2);
321 if (y1 > y2) SWAP(y1, y2);
323 /* Clip rect to bitmap bounds */
326 if (x1 > bm->width) x1 = bm->width;
327 if (x2 > bm->width) x2 = bm->width;
330 if (y1 > bm->width) y1 = bm->width;
331 if (y2 > bm->width) y2 = bm->width;
335 * NOTE: Code paths are duplicated for efficiency
337 if (color) /* fill */
339 for (x = x1; x < x2; x++)
340 for (y = y1; y < y2; y++)
345 for (x = x1; x < x2; x++)
346 for (y = y1; y < y2; y++)
353 * Draw a filled rectangle.
355 * \note The bottom-right border of the rectangle is not drawn.
357 * \note This function does \b not update the current pen position
359 void gfx_rectFill(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
361 gfx_rectFillC(bm, x1, y1, x2, y2, 0xFF);
366 * Clear a rectangular area.
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_rectClear(Bitmap *bm, coord_t x1, coord_t y1, coord_t x2, coord_t y2)
374 gfx_rectFillC(bm, x1, y1, x2, y2, 0x00);
379 * Imposta un rettangolo di clipping per il disegno nella bitmap.
381 void gfx_setClipRect(Bitmap *bm, coord_t minx, coord_t miny, coord_t maxx, coord_t maxy)
387 ASSERT(maxx <= bm->width);
388 ASSERT(maxy <= bm->height);
395 /* DB(kprintf("cr.xmin = %d, cr.ymin = %d, cr.xmax = %d, cr.ymax = %d\n",
396 bm->cr.xMin, bm->cr.ymin, bm->cr.xmax, bm->cr.ymax);)
401 #if CONFIG_GFX_VCOORDS
403 * Imposta gli estremi del sistema di coordinate cartesiane rispetto
404 * al rettangolo di clipping della bitmap.
406 void gfx_setViewRect(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
413 bm->scaleX = (vcoord_t)(bm->cr.xmax - bm->cr.xmin - 1) / (vcoord_t)(x2 - x1);
414 bm->scaleY = (vcoord_t)(bm->cr.ymax - bm->cr.ymin - 1) / (vcoord_t)(y2 - y1);
416 /* DB(kprintf("orgX = %f, orgY = %f, scaleX = %f, scaleY = %f\n",
417 bm->orgX, bm->orgY, bm->scaleX, bm->scaleY);)
423 * Transform a coordinate from the current reference system to a
424 * pixel offset within the bitmap.
426 coord_t gfx_transformX(Bitmap *bm, vcoord_t x)
428 return bm->cr.xmin + (coord_t)((x - bm->orgX) * bm->scaleX);
432 * Transform a coordinate from the current reference system to a
433 * pixel offset within the bitmap.
435 coord_t gfx_transformY(Bitmap *bm, vcoord_t y)
437 return bm->cr.ymin + (coord_t)((y - bm->orgY) * bm->scaleY);
442 * Draw a line from (x1;y1) to (x2;y2).
444 void gfx_vline(Bitmap *bm, vcoord_t x1, vcoord_t y1, vcoord_t x2, vcoord_t y2)
447 gfx_transformX(bm, x1), gfx_transformY(bm, y1),
448 gfx_transformY(bm, x2), gfx_transformY(bm, y2));
450 #endif /* CONFIG_GFX_VCOORDS */