SDL  2.0
SDL_surface.h
Go to the documentation of this file.
1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 
22 /**
23  * \file SDL_surface.h
24  *
25  * Header file for ::SDL_Surface definition and management functions.
26  */
27 
28 #ifndef _SDL_surface_h
29 #define _SDL_surface_h
30 
31 #include "SDL_stdinc.h"
32 #include "SDL_pixels.h"
33 #include "SDL_rect.h"
34 #include "SDL_blendmode.h"
35 #include "SDL_rwops.h"
36 
37 #include "begin_code.h"
38 /* Set up for C function definitions, even when using C++ */
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
43 /**
44  * \name Surface flags
45  *
46  * These are the currently supported flags for the ::SDL_Surface.
47  *
48  * \internal
49  * Used internally (read-only).
50  */
51 /* @{ */
52 #define SDL_SWSURFACE 0 /**< Just here for compatibility */
53 #define SDL_PREALLOC 0x00000001 /**< Surface uses preallocated memory */
54 #define SDL_RLEACCEL 0x00000002 /**< Surface is RLE encoded */
55 #define SDL_DONTFREE 0x00000004 /**< Surface is referenced internally */
56 /* @} *//* Surface flags */
57 
58 /**
59  * Evaluates to true if the surface needs to be locked before access.
60  */
61 #define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0)
62 
63 /**
64  * \brief A collection of pixels used in software blitting.
65  *
66  * \note This structure should be treated as read-only, except for \c pixels,
67  * which, if not NULL, contains the raw pixel data for the surface.
68  */
69 typedef struct SDL_Surface
70 {
71  Uint32 flags; /**< Read-only */
72  SDL_PixelFormat *format; /**< Read-only */
73  int w, h; /**< Read-only */
74  int pitch; /**< Read-only */
75  void *pixels; /**< Read-write */
76 
77  /** Application data associated with the surface */
78  void *userdata; /**< Read-write */
79 
80  /** information needed for surfaces requiring locks */
81  int locked; /**< Read-only */
82  void *lock_data; /**< Read-only */
83 
84  /** clipping information */
85  SDL_Rect clip_rect; /**< Read-only */
86 
87  /** info for fast blit mapping to other surfaces */
88  struct SDL_BlitMap *map; /**< Private */
89 
90  /** Reference count -- used when freeing surface */
91  int refcount; /**< Read-mostly */
92 } SDL_Surface;
93 
94 /**
95  * \brief The type of function used for surface blitting functions.
96  */
97 typedef int (*SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect,
98  struct SDL_Surface * dst, SDL_Rect * dstrect);
99 
100 /**
101  * Allocate and free an RGB surface.
102  *
103  * If the depth is 4 or 8 bits, an empty palette is allocated for the surface.
104  * If the depth is greater than 8 bits, the pixel format is set using the
105  * flags '[RGB]mask'.
106  *
107  * If the function runs out of memory, it will return NULL.
108  *
109  * \param flags The \c flags are obsolete and should be set to 0.
110  * \param width The width in pixels of the surface to create.
111  * \param height The height in pixels of the surface to create.
112  * \param depth The depth in bits of the surface to create.
113  * \param Rmask The red mask of the surface to create.
114  * \param Gmask The green mask of the surface to create.
115  * \param Bmask The blue mask of the surface to create.
116  * \param Amask The alpha mask of the surface to create.
117  */
119  (Uint32 flags, int width, int height, int depth,
120  Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
122  int width,
123  int height,
124  int depth,
125  int pitch,
126  Uint32 Rmask,
127  Uint32 Gmask,
128  Uint32 Bmask,
129  Uint32 Amask);
130 extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface);
131 
132 /**
133  * \brief Set the palette used by a surface.
134  *
135  * \return 0, or -1 if the surface format doesn't use a palette.
136  *
137  * \note A single palette can be shared with many surfaces.
138  */
140  SDL_Palette * palette);
141 
142 /**
143  * \brief Sets up a surface for directly accessing the pixels.
144  *
145  * Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write
146  * to and read from \c surface->pixels, using the pixel format stored in
147  * \c surface->format. Once you are done accessing the surface, you should
148  * use SDL_UnlockSurface() to release it.
149  *
150  * Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates
151  * to 0, then you can read and write to the surface at any time, and the
152  * pixel format of the surface will not change.
153  *
154  * No operating system or library calls should be made between lock/unlock
155  * pairs, as critical system locks may be held during this time.
156  *
157  * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
158  *
159  * \sa SDL_UnlockSurface()
160  */
161 extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
162 /** \sa SDL_LockSurface() */
163 extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);
164 
165 /**
166  * Load a surface from a seekable SDL data stream (memory or file).
167  *
168  * If \c freesrc is non-zero, the stream will be closed after being read.
169  *
170  * The new surface should be freed with SDL_FreeSurface().
171  *
172  * \return the new surface, or NULL if there was an error.
173  */
175  int freesrc);
176 
177 /**
178  * Load a surface from a file.
179  *
180  * Convenience macro.
181  */
182 #define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
183 
184 /**
185  * Save a surface to a seekable SDL data stream (memory or file).
186  *
187  * If \c freedst is non-zero, the stream will be closed after being written.
188  *
189  * \return 0 if successful or -1 if there was an error.
190  */
192  (SDL_Surface * surface, SDL_RWops * dst, int freedst);
193 
194 /**
195  * Save a surface to a file.
196  *
197  * Convenience macro.
198  */
199 #define SDL_SaveBMP(surface, file) \
200  SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
201 
202 /**
203  * \brief Sets the RLE acceleration hint for a surface.
204  *
205  * \return 0 on success, or -1 if the surface is not valid
206  *
207  * \note If RLE is enabled, colorkey and alpha blending blits are much faster,
208  * but the surface must be locked before directly accessing the pixels.
209  */
210 extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface,
211  int flag);
212 
213 /**
214  * \brief Sets the color key (transparent pixel) in a blittable surface.
215  *
216  * \param surface The surface to update
217  * \param flag Non-zero to enable colorkey and 0 to disable colorkey
218  * \param key The transparent pixel in the native surface format
219  *
220  * \return 0 on success, or -1 if the surface is not valid
221  *
222  * You can pass SDL_RLEACCEL to enable RLE accelerated blits.
223  */
224 extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface,
225  int flag, Uint32 key);
226 
227 /**
228  * \brief Gets the color key (transparent pixel) in a blittable surface.
229  *
230  * \param surface The surface to update
231  * \param key A pointer filled in with the transparent pixel in the native
232  * surface format
233  *
234  * \return 0 on success, or -1 if the surface is not valid or colorkey is not
235  * enabled.
236  */
237 extern DECLSPEC int SDLCALL SDL_GetColorKey(SDL_Surface * surface,
238  Uint32 * key);
239 
240 /**
241  * \brief Set an additional color value used in blit operations.
242  *
243  * \param surface The surface to update.
244  * \param r The red color value multiplied into blit operations.
245  * \param g The green color value multiplied into blit operations.
246  * \param b The blue color value multiplied into blit operations.
247  *
248  * \return 0 on success, or -1 if the surface is not valid.
249  *
250  * \sa SDL_GetSurfaceColorMod()
251  */
253  Uint8 r, Uint8 g, Uint8 b);
254 
255 
256 /**
257  * \brief Get the additional color value used in blit operations.
258  *
259  * \param surface The surface to query.
260  * \param r A pointer filled in with the current red color value.
261  * \param g A pointer filled in with the current green color value.
262  * \param b A pointer filled in with the current blue color value.
263  *
264  * \return 0 on success, or -1 if the surface is not valid.
265  *
266  * \sa SDL_SetSurfaceColorMod()
267  */
269  Uint8 * r, Uint8 * g,
270  Uint8 * b);
271 
272 /**
273  * \brief Set an additional alpha value used in blit operations.
274  *
275  * \param surface The surface to update.
276  * \param alpha The alpha value multiplied into blit operations.
277  *
278  * \return 0 on success, or -1 if the surface is not valid.
279  *
280  * \sa SDL_GetSurfaceAlphaMod()
281  */
283  Uint8 alpha);
284 
285 /**
286  * \brief Get the additional alpha value used in blit operations.
287  *
288  * \param surface The surface to query.
289  * \param alpha A pointer filled in with the current alpha value.
290  *
291  * \return 0 on success, or -1 if the surface is not valid.
292  *
293  * \sa SDL_SetSurfaceAlphaMod()
294  */
296  Uint8 * alpha);
297 
298 /**
299  * \brief Set the blend mode used for blit operations.
300  *
301  * \param surface The surface to update.
302  * \param blendMode ::SDL_BlendMode to use for blit blending.
303  *
304  * \return 0 on success, or -1 if the parameters are not valid.
305  *
306  * \sa SDL_GetSurfaceBlendMode()
307  */
310 
311 /**
312  * \brief Get the blend mode used for blit operations.
313  *
314  * \param surface The surface to query.
315  * \param blendMode A pointer filled in with the current blend mode.
316  *
317  * \return 0 on success, or -1 if the surface is not valid.
318  *
319  * \sa SDL_SetSurfaceBlendMode()
320  */
323 
324 /**
325  * Sets the clipping rectangle for the destination surface in a blit.
326  *
327  * If the clip rectangle is NULL, clipping will be disabled.
328  *
329  * If the clip rectangle doesn't intersect the surface, the function will
330  * return SDL_FALSE and blits will be completely clipped. Otherwise the
331  * function returns SDL_TRUE and blits to the surface will be clipped to
332  * the intersection of the surface area and the clipping rectangle.
333  *
334  * Note that blits are automatically clipped to the edges of the source
335  * and destination surfaces.
336  */
338  const SDL_Rect * rect);
339 
340 /**
341  * Gets the clipping rectangle for the destination surface in a blit.
342  *
343  * \c rect must be a pointer to a valid rectangle which will be filled
344  * with the correct values.
345  */
346 extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
347  SDL_Rect * rect);
348 
349 /**
350  * Creates a new surface of the specified format, and then copies and maps
351  * the given surface to it so the blit of the converted surface will be as
352  * fast as possible. If this function fails, it returns NULL.
353  *
354  * The \c flags parameter is passed to SDL_CreateRGBSurface() and has those
355  * semantics. You can also pass ::SDL_RLEACCEL in the flags parameter and
356  * SDL will try to RLE accelerate colorkey and alpha blits in the resulting
357  * surface.
358  */
360  (SDL_Surface * src, const SDL_PixelFormat * fmt, Uint32 flags);
363 
364 /**
365  * \brief Copy a block of pixels of one format to another format
366  *
367  * \return 0 on success, or -1 if there was an error
368  */
369 extern DECLSPEC int SDLCALL SDL_ConvertPixels(int width, int height,
370  Uint32 src_format,
371  const void * src, int src_pitch,
372  Uint32 dst_format,
373  void * dst, int dst_pitch);
374 
375 /**
376  * Performs a fast fill of the given rectangle with \c color.
377  *
378  * If \c rect is NULL, the whole surface will be filled with \c color.
379  *
380  * The color should be a pixel of the format used by the surface, and
381  * can be generated by the SDL_MapRGB() function.
382  *
383  * \return 0 on success, or -1 on error.
384  */
385 extern DECLSPEC int SDLCALL SDL_FillRect
386  (SDL_Surface * dst, const SDL_Rect * rect, Uint32 color);
387 extern DECLSPEC int SDLCALL SDL_FillRects
388  (SDL_Surface * dst, const SDL_Rect * rects, int count, Uint32 color);
389 
390 /**
391  * Performs a fast blit from the source surface to the destination surface.
392  *
393  * This assumes that the source and destination rectangles are
394  * the same size. If either \c srcrect or \c dstrect are NULL, the entire
395  * surface (\c src or \c dst) is copied. The final blit rectangles are saved
396  * in \c srcrect and \c dstrect after all clipping is performed.
397  *
398  * \return If the blit is successful, it returns 0, otherwise it returns -1.
399  *
400  * The blit function should not be called on a locked surface.
401  *
402  * The blit semantics for surfaces with and without blending and colorkey
403  * are defined as follows:
404  * \verbatim
405  RGBA->RGB:
406  Source surface blend mode set to SDL_BLENDMODE_BLEND:
407  alpha-blend (using the source alpha-channel and per-surface alpha)
408  SDL_SRCCOLORKEY ignored.
409  Source surface blend mode set to SDL_BLENDMODE_NONE:
410  copy RGB.
411  if SDL_SRCCOLORKEY set, only copy the pixels matching the
412  RGB values of the source color key, ignoring alpha in the
413  comparison.
414 
415  RGB->RGBA:
416  Source surface blend mode set to SDL_BLENDMODE_BLEND:
417  alpha-blend (using the source per-surface alpha)
418  Source surface blend mode set to SDL_BLENDMODE_NONE:
419  copy RGB, set destination alpha to source per-surface alpha value.
420  both:
421  if SDL_SRCCOLORKEY set, only copy the pixels matching the
422  source color key.
423 
424  RGBA->RGBA:
425  Source surface blend mode set to SDL_BLENDMODE_BLEND:
426  alpha-blend (using the source alpha-channel and per-surface alpha)
427  SDL_SRCCOLORKEY ignored.
428  Source surface blend mode set to SDL_BLENDMODE_NONE:
429  copy all of RGBA to the destination.
430  if SDL_SRCCOLORKEY set, only copy the pixels matching the
431  RGB values of the source color key, ignoring alpha in the
432  comparison.
433 
434  RGB->RGB:
435  Source surface blend mode set to SDL_BLENDMODE_BLEND:
436  alpha-blend (using the source per-surface alpha)
437  Source surface blend mode set to SDL_BLENDMODE_NONE:
438  copy RGB.
439  both:
440  if SDL_SRCCOLORKEY set, only copy the pixels matching the
441  source color key.
442  \endverbatim
443  *
444  * You should call SDL_BlitSurface() unless you know exactly how SDL
445  * blitting works internally and how to use the other blit functions.
446  */
447 #define SDL_BlitSurface SDL_UpperBlit
448 
449 /**
450  * This is the public blit function, SDL_BlitSurface(), and it performs
451  * rectangle validation and clipping before passing it to SDL_LowerBlit()
452  */
453 extern DECLSPEC int SDLCALL SDL_UpperBlit
454  (SDL_Surface * src, const SDL_Rect * srcrect,
455  SDL_Surface * dst, SDL_Rect * dstrect);
456 
457 /**
458  * This is a semi-private blit function and it performs low-level surface
459  * blitting only.
460  */
461 extern DECLSPEC int SDLCALL SDL_LowerBlit
462  (SDL_Surface * src, SDL_Rect * srcrect,
463  SDL_Surface * dst, SDL_Rect * dstrect);
464 
465 /**
466  * \brief Perform a fast, low quality, stretch blit between two surfaces of the
467  * same pixel format.
468  *
469  * \note This function uses a static buffer, and is not thread-safe.
470  */
472  const SDL_Rect * srcrect,
473  SDL_Surface * dst,
474  const SDL_Rect * dstrect);
475 
476 #define SDL_BlitScaled SDL_UpperBlitScaled
477 
478 /**
479  * This is the public scaled blit function, SDL_BlitScaled(), and it performs
480  * rectangle validation and clipping before passing it to SDL_LowerBlitScaled()
481  */
483  (SDL_Surface * src, const SDL_Rect * srcrect,
484  SDL_Surface * dst, SDL_Rect * dstrect);
485 
486 /**
487  * This is a semi-private blit function and it performs low-level surface
488  * scaled blitting only.
489  */
491  (SDL_Surface * src, SDL_Rect * srcrect,
492  SDL_Surface * dst, SDL_Rect * dstrect);
493 
494 
495 /* Ends C function definitions when using C++ */
496 #ifdef __cplusplus
497 }
498 #endif
499 #include "close_code.h"
500 
501 #endif /* _SDL_surface_h */
502 
503 /* vi: set ts=4 sw=4 expandtab: */
GLenum GLenum dst
int SDL_GetSurfaceColorMod(SDL_Surface *surface, Uint8 *r, Uint8 *g, Uint8 *b)
Get the additional color value used in blit operations.
Definition: SDL_surface.c:336
void SDL_FreeSurface(SDL_Surface *surface)
Definition: SDL_surface.c:1116
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
int SDL_LockSurface(SDL_Surface *surface)
Sets up a surface for directly accessing the pixels.
Definition: SDL_surface.c:803
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
SDL_Surface * SDL_CreateRGBSurfaceFrom(void *pixels, int width, int height, int depth, int pitch, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
Definition: SDL_surface.c:121
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:155
SDL_BlendMode
The blend mode used in SDL_RenderCopy() and drawing operations.
Definition: SDL_blendmode.h:40
int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag)
Sets the RLE acceleration hint for a surface.
Definition: SDL_surface.c:156
GLuint GLuint GLsizei count
Definition: SDL_opengl.h:1564
SDL_Rect rect
Definition: testrelative.c:27
int SDL_UpperBlit(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:523
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
int SDL_SaveBMP_RW(SDL_Surface *surface, SDL_RWops *dst, int freedst)
Definition: SDL_bmp.c:454
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1565
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
int SDL_ConvertPixels(int width, int height, Uint32 src_format, const void *src, int src_pitch, Uint32 dst_format, void *dst, int dst_pitch)
Copy a block of pixels of one format to another format.
Definition: SDL_surface.c:1022
GLfloat GLfloat GLfloat alpha
int SDL_SoftStretch(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, const SDL_Rect *dstrect)
Perform a fast, low quality, stretch blit between two surfaces of the same pixel format.
Definition: SDL_stretch.c:203
int SDL_GetSurfaceAlphaMod(SDL_Surface *surface, Uint8 *alpha)
Get the additional alpha value used in blit operations.
Definition: SDL_surface.c:378
Uint32 flags
Definition: SDL_surface.h:71
static SDL_BlendMode blendMode
Definition: testdraw2.c:34
SDL_bool
Definition: SDL_stdinc.h:126
GLboolean GLboolean g
int SDL_SetSurfaceColorMod(SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b)
Set an additional color value used in blit operations.
Definition: SDL_surface.c:310
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
#define DECLSPEC
Definition: SDL_internal.h:30
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
Definition: SDL_surface.c:457
SDL_Surface * SDL_CreateRGBSurface(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
Definition: SDL_surface.c:34
void * pixels
Definition: SDL_surface.h:75
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
Definition: SDL_surface.c:481
int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:500
int SDL_SetColorKey(SDL_Surface *surface, int flag, Uint32 key)
Sets the color key (transparent pixel) in a blittable surface.
Definition: SDL_surface.c:177
int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette)
Set the palette used by a surface.
Definition: SDL_surface.c:142
int SDL_GetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode *blendMode)
Get the blend mode used for blit operations.
Definition: SDL_surface.c:428
int SDL_LowerBlitScaled(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:776
int SDL_FillRect(SDL_Surface *dst, const SDL_Rect *rect, Uint32 color)
Definition: SDL_fillrect.c:237
SDL_Rect clip_rect
Definition: SDL_surface.h:85
SDL_PixelFormat * format
Definition: SDL_surface.h:72
GLint GLint GLsizei GLsizei GLsizei depth
Definition: SDL_opengl.h:1565
int(* SDL_blit)(struct SDL_Surface *src, SDL_Rect *srcrect, struct SDL_Surface *dst, SDL_Rect *dstrect)
The type of function used for surface blitting functions.
Definition: SDL_surface.h:97
SDL_Rect rects[MAX_RECTS]
GLuint color
int SDL_FillRects(SDL_Surface *dst, const SDL_Rect *rects, int count, Uint32 color)
Definition: SDL_fillrect.c:327
int SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha)
Set an additional alpha value used in blit operations.
Definition: SDL_surface.c:355
int SDL_UpperBlitScaled(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:622
Uint32 pixel_format
Definition: testoverlay2.c:152
void SDL_UnlockSurface(SDL_Surface *surface)
Definition: SDL_surface.c:824
GLbitfield flags
int SDL_GetColorKey(SDL_Surface *surface, Uint32 *key)
Gets the color key (transparent pixel) in a blittable surface.
Definition: SDL_surface.c:222
SDL_Surface * SDL_ConvertSurfaceFormat(SDL_Surface *src, Uint32 pixel_format, Uint32 flags)
Definition: SDL_surface.c:966
SDL_Surface * SDL_LoadBMP_RW(SDL_RWops *src, int freesrc)
Definition: SDL_bmp.c:81
GLenum src
#define SDLCALL
Definition: SDL_internal.h:31
void * lock_data
Definition: SDL_surface.h:82
GLboolean GLboolean GLboolean b
void * userdata
Definition: SDL_surface.h:78
SDL_Surface * SDL_ConvertSurface(SDL_Surface *src, const SDL_PixelFormat *fmt, Uint32 flags)
Definition: SDL_surface.c:842
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
int SDL_SetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode blendMode)
Set the blend mode used for blit operations.
Definition: SDL_surface.c:391