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comparison src/video/SDL_draw.h @ 3594:c8bed77b0386

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Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects() Fixed line drawing so when blending a sequence of lines there are no overlapping pixels drawn.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 18 Dec 2009 07:41:59 +0000
parents b931bcfd94a0
children f638ded38b8a
comparison
equal deleted inserted replaced
3593:b931bcfd94a0 3594:c8bed77b0386
281 * Define line drawing macro 281 * Define line drawing macro
282 */ 282 */
283 283
284 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x)) 284 #define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
285 285
286 #define BRESENHAM(x1, y1, x2, y2, op) \ 286 #define BRESENHAM(x1, y1, x2, y2, op, draw_end) \
287 { \ 287 { \
288 int i, deltax, deltay, numpixels; \ 288 int i, deltax, deltay, numpixels; \
289 int d, dinc1, dinc2; \ 289 int d, dinc1, dinc2; \
290 int x, xinc1, xinc2; \ 290 int x, xinc1, xinc2; \
291 int y, yinc1, yinc2; \ 291 int y, yinc1, yinc2; \
323 } \ 323 } \
324 \ 324 \
325 x = x1; \ 325 x = x1; \
326 y = y1; \ 326 y = y1; \
327 \ 327 \
328 if (!draw_end) { \
329 --numpixels; \
330 } \
328 for (i = 0; i < numpixels; ++i) { \ 331 for (i = 0; i < numpixels; ++i) { \
329 op(x, y); \ 332 op(x, y); \
330 if (d < 0) { \ 333 if (d < 0) { \
331 d += dinc1; \ 334 d += dinc1; \
332 x += xinc1; \ 335 x += xinc1; \
336 x += xinc2; \ 339 x += xinc2; \
337 y += yinc2; \ 340 y += yinc2; \
338 } \ 341 } \
339 } \ 342 } \
340 } 343 }
341 #define DRAWLINE(x0, y0, x1, y1, op) BRESENHAM(x0, y0, x1, y1, op) 344 #define DRAWLINE BRESENHAM
342 345
343 /* 346 /*
344 * Define draw rect macro 347 * Define draw rect macro
348 * (not tested, this level of optimization not needed ... yet?)
345 */ 349 */
346 #define DRAWRECT(type, op) \ 350 #define DRAWRECT(type, op) \
347 do { \ 351 do { \
348 int width = rect->w; \ 352 int width = rect->w; \
349 int height = rect->h; \ 353 int height = rect->h; \