SDL 2.0
SDL_blendpoint.h File Reference
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Functions

int SDL_BlendPoint (SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
 
int SDL_BlendPoints (SDL_Surface *dst, const SDL_Point *points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
 

Function Documentation

◆ SDL_BlendPoint()

int SDL_BlendPoint ( SDL_Surface dst,
int  x,
int  y,
SDL_BlendMode  blendMode,
Uint8  r,
Uint8  g,
Uint8  b,
Uint8  a 
)

Definition at line 196 of file SDL_blendpoint.c.

198{
199 if (!dst) {
200 return SDL_SetError("Passed NULL destination surface");
201 }
202
203 /* This function doesn't work on surfaces < 8 bpp */
204 if (dst->format->BitsPerPixel < 8) {
205 return SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
206 }
207
208 /* Perform clipping */
209 if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
210 x >= (dst->clip_rect.x + dst->clip_rect.w) ||
211 y >= (dst->clip_rect.y + dst->clip_rect.h)) {
212 return 0;
213 }
214
216 r = DRAW_MUL(r, a);
217 g = DRAW_MUL(g, a);
218 b = DRAW_MUL(b, a);
219 }
220
221 switch (dst->format->BitsPerPixel) {
222 case 15:
223 switch (dst->format->Rmask) {
224 case 0x7C00:
225 return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
226 }
227 break;
228 case 16:
229 switch (dst->format->Rmask) {
230 case 0xF800:
231 return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
232 }
233 break;
234 case 32:
235 switch (dst->format->Rmask) {
236 case 0x00FF0000:
237 if (!dst->format->Amask) {
238 return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, a);
239 } else {
240 return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, a);
241 }
242 /* break; -Wunreachable-code-break */
243 }
244 break;
245 default:
246 break;
247 }
248
249 if (!dst->format->Amask) {
250 return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
251 } else {
252 return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
253 }
254}
@ SDL_BLENDMODE_ADD
Definition: SDL_blendmode.h:47
@ SDL_BLENDMODE_BLEND
Definition: SDL_blendmode.h:44
static int SDL_BlendPoint_RGBA(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
static int SDL_BlendPoint_RGB888(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
static int SDL_BlendPoint_ARGB8888(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
static int SDL_BlendPoint_RGB555(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
static int SDL_BlendPoint_RGB565(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
static int SDL_BlendPoint_RGB(SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
#define DRAW_MUL(_a, _b)
Definition: SDL_draw.h:29
#define SDL_SetError
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2079
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
GLboolean GLboolean GLboolean b
GLboolean GLboolean GLboolean GLboolean a
GLenum GLenum dst
GLboolean GLboolean g
static SDL_BlendMode blendMode
Definition: testdraw2.c:34

References blendMode, DRAW_MUL, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BlendPoint_ARGB8888(), SDL_BlendPoint_RGB(), SDL_BlendPoint_RGB555(), SDL_BlendPoint_RGB565(), SDL_BlendPoint_RGB888(), SDL_BlendPoint_RGBA(), and SDL_SetError.

Referenced by SDL_BlendLines().

◆ SDL_BlendPoints()

int SDL_BlendPoints ( SDL_Surface dst,
const SDL_Point points,
int  count,
SDL_BlendMode  blendMode,
Uint8  r,
Uint8  g,
Uint8  b,
Uint8  a 
)

Definition at line 257 of file SDL_blendpoint.c.

259{
260 int minx, miny;
261 int maxx, maxy;
262 int i;
263 int x, y;
264 int (*func)(SDL_Surface * dst, int x, int y,
266 int status = 0;
267
268 if (!dst) {
269 return SDL_SetError("Passed NULL destination surface");
270 }
271
272 /* This function doesn't work on surfaces < 8 bpp */
273 if (dst->format->BitsPerPixel < 8) {
274 return SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
275 }
276
278 r = DRAW_MUL(r, a);
279 g = DRAW_MUL(g, a);
280 b = DRAW_MUL(b, a);
281 }
282
283 /* FIXME: Does this function pointer slow things down significantly? */
284 switch (dst->format->BitsPerPixel) {
285 case 15:
286 switch (dst->format->Rmask) {
287 case 0x7C00:
289 break;
290 }
291 break;
292 case 16:
293 switch (dst->format->Rmask) {
294 case 0xF800:
296 break;
297 }
298 break;
299 case 32:
300 switch (dst->format->Rmask) {
301 case 0x00FF0000:
302 if (!dst->format->Amask) {
304 } else {
306 }
307 break;
308 }
309 break;
310 default:
311 break;
312 }
313
314 if (!func) {
315 if (!dst->format->Amask) {
317 } else {
319 }
320 }
321
322 minx = dst->clip_rect.x;
323 maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
324 miny = dst->clip_rect.y;
325 maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
326
327 for (i = 0; i < count; ++i) {
328 x = points[i].x;
329 y = points[i].y;
330
331 if (x < minx || x > maxx || y < miny || y > maxy) {
332 continue;
333 }
334 status = func(dst, x, y, blendMode, r, g, b, a);
335 }
336 return status;
337}
SDL_BlendMode
The blend mode used in SDL_RenderCopy() and drawing operations.
Definition: SDL_blendmode.h:41
GLuint GLuint GLsizei count
Definition: SDL_opengl.h:1571
GLfixed GLfixed GLint GLint GLfixed points
GLenum func
uint8_t Uint8
Definition: SDL_stdinc.h:179
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:167
A collection of pixels used in software blitting.
Definition: SDL_surface.h:71

References blendMode, DRAW_MUL, i, NULL, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BlendPoint_ARGB8888(), SDL_BlendPoint_RGB(), SDL_BlendPoint_RGB555(), SDL_BlendPoint_RGB565(), SDL_BlendPoint_RGB888(), SDL_BlendPoint_RGBA(), and SDL_SetError.

Referenced by SW_RunCommandQueue().