Repository navigation
Expand file tree
/
Copy pathSDL_render.h
More file actions
1932 lines (1825 loc) · 72.8 KB
/
Copy pathSDL_render.h
File metadata and controls
1932 lines (1825 loc) · 72.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/**
* # CategoryRender
*
* Header file for SDL 2D rendering functions.
*
* This API supports the following features:
*
* - single pixel points
* - single pixel lines
* - filled rectangles
* - texture images
*
* The primitives may be drawn in opaque, blended, or additive modes.
*
* The texture images may be drawn in opaque, blended, or additive modes. They
* can have an additional color tint or alpha modulation applied to them, and
* may also be stretched with linear interpolation.
* This API is designed to accelerate simple 2D operations. You may want more
* functionality such as polygons and particle effects and in that case you
* should use SDL's OpenGL/Direct3D support or one of the many good 3D
* engines.
*
* These functions must be called from the main thread. See this bug for
* details: https://github.com/libsdl-org/SDL/issues/986
*/
#ifndef SDL_render_h_
#define SDL_render_h_
#include "SDL_stdinc.h"
#include "SDL_rect.h"
#include "SDL_video.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
/**
* Flags used when creating a rendering context
*/
typedef enum SDL_RendererFlags
{
SDL_RENDERER_SOFTWARE = 0x00000001, /**< The renderer is a software fallback */
SDL_RENDERER_ACCELERATED = 0x00000002, /**< The renderer uses hardware
acceleration */
SDL_RENDERER_PRESENTVSYNC = 0x00000004, /**< Present is synchronized
with the refresh rate */
SDL_RENDERER_TARGETTEXTURE = 0x00000008 /**< The renderer supports
rendering to texture */
} SDL_RendererFlags;
/**
* Information on the capabilities of a render driver or context.
*/
typedef struct SDL_RendererInfo
{
const char *name; /**< The name of the renderer */
Uint32 flags; /**< Supported SDL_RendererFlags */
Uint32 num_texture_formats; /**< The number of available texture formats */
Uint32 texture_formats[16]; /**< The available texture formats */
int max_texture_width; /**< The maximum texture width */
int max_texture_height; /**< The maximum texture height */
} SDL_RendererInfo;
/**
* Vertex structure
*/
typedef struct SDL_Vertex
{
SDL_FPoint position; /**< Vertex position, in SDL_Renderer coordinates */
SDL_Color color; /**< Vertex color */
SDL_FPoint tex_coord; /**< Normalized texture coordinates, if needed */
} SDL_Vertex;
/**
* The scaling mode for a texture.
*/
typedef enum SDL_ScaleMode
{
SDL_ScaleModeNearest, /**< nearest pixel sampling */
SDL_ScaleModeLinear, /**< linear filtering */
SDL_ScaleModeBest /**< anisotropic filtering */
} SDL_ScaleMode;
/**
* The access pattern allowed for a texture.
*/
typedef enum SDL_TextureAccess
{
SDL_TEXTUREACCESS_STATIC, /**< Changes rarely, not lockable */
SDL_TEXTUREACCESS_STREAMING, /**< Changes frequently, lockable */
SDL_TEXTUREACCESS_TARGET /**< Texture can be used as a render target */
} SDL_TextureAccess;
/**
* The texture channel modulation used in SDL_RenderCopy().
*/
typedef enum SDL_TextureModulate
{
SDL_TEXTUREMODULATE_NONE = 0x00000000, /**< No modulation */
SDL_TEXTUREMODULATE_COLOR = 0x00000001, /**< srcC = srcC * color */
SDL_TEXTUREMODULATE_ALPHA = 0x00000002 /**< srcA = srcA * alpha */
} SDL_TextureModulate;
/**
* Flip constants for SDL_RenderCopyEx
*/
typedef enum SDL_RendererFlip
{
SDL_FLIP_NONE = 0x00000000, /**< Do not flip */
SDL_FLIP_HORIZONTAL = 0x00000001, /**< flip horizontally */
SDL_FLIP_VERTICAL = 0x00000002 /**< flip vertically */
} SDL_RendererFlip;
/**
* A structure representing rendering state
*/
struct SDL_Renderer;
typedef struct SDL_Renderer SDL_Renderer;
/**
* An efficient driver-specific representation of pixel data
*/
struct SDL_Texture;
typedef struct SDL_Texture SDL_Texture;
/* Function prototypes */
/**
* Get the number of 2D rendering drivers available for the current display.
*
* A render driver is a set of code that handles rendering and texture
* management on a particular display. Normally there is only one, but some
* drivers may have several available with different capabilities.
*
* There may be none if SDL was compiled without render support.
*
* \returns a number >= 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_GetRenderDriverInfo
*/
extern DECLSPEC int SDLCALL SDL_GetNumRenderDrivers(void);
/**
* Get info about a specific 2D rendering driver for the current display.
*
* \param index the index of the driver to query information about.
* \param info an SDL_RendererInfo structure to be filled with information on
* the rendering driver.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_GetNumRenderDrivers
*/
extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,
SDL_RendererInfo * info);
/**
* Create a window and default renderer.
*
* \param width the width of the window.
* \param height the height of the window.
* \param window_flags the flags used to create the window (see
* SDL_CreateWindow()).
* \param window a pointer filled with the window, or NULL on error.
* \param renderer a pointer filled with the renderer, or NULL on error.
* \returns 0 on success, or -1 on error; call SDL_GetError() for more
* information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_CreateWindow
*/
extern DECLSPEC int SDLCALL SDL_CreateWindowAndRenderer(
int width, int height, Uint32 window_flags,
SDL_Window **window, SDL_Renderer **renderer);
/**
* Create a 2D rendering context for a window.
*
* \param window the window where rendering is displayed.
* \param index the index of the rendering driver to initialize, or -1 to
* initialize the first one supporting the requested flags.
* \param flags 0, or one or more SDL_RendererFlags OR'd together.
* \returns a valid rendering context or NULL if there was an error; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateSoftwareRenderer
* \sa SDL_DestroyRenderer
* \sa SDL_GetNumRenderDrivers
* \sa SDL_GetRendererInfo
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateRenderer(SDL_Window * window,
int index, Uint32 flags);
/**
* Create a 2D software rendering context for a surface.
*
* Two other API which can be used to create SDL_Renderer:
* SDL_CreateRenderer() and SDL_CreateWindowAndRenderer(). These can _also_
* create a software renderer, but they are intended to be used with an
* SDL_Window as the final destination and not an SDL_Surface.
*
* \param surface the SDL_Surface structure representing the surface where
* rendering is done.
* \returns a valid rendering context or NULL if there was an error; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_CreateWindowRenderer
* \sa SDL_DestroyRenderer
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateSoftwareRenderer(SDL_Surface * surface);
/**
* Get the renderer associated with a window.
*
* \param window the window to query.
* \returns the rendering context on success or NULL on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_GetRenderer(SDL_Window * window);
/**
* Get the window associated with a renderer.
*
* \param renderer the renderer to query.
* \returns the window on success or NULL on failure; call SDL_GetError() for
* more information.
*
* \since This function is available since SDL 2.0.22.
*/
extern DECLSPEC SDL_Window * SDLCALL SDL_RenderGetWindow(SDL_Renderer *renderer);
/**
* Get information about a rendering context.
*
* \param renderer the rendering context.
* \param info an SDL_RendererInfo structure filled with information about the
* current renderer.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
*/
extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,
SDL_RendererInfo * info);
/**
* Get the output size in pixels of a rendering context.
*
* Due to high-dpi displays, you might end up with a rendering context that
* has more pixels than the window that contains it, so use this instead of
* SDL_GetWindowSize() to decide how much drawing area you have.
*
* \param renderer the rendering context.
* \param w an int filled with the width.
* \param h an int filled with the height.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetRenderer
*/
extern DECLSPEC int SDLCALL SDL_GetRendererOutputSize(SDL_Renderer * renderer,
int *w, int *h);
/**
* Create a texture for a rendering context.
*
* You can set the texture scaling method by setting
* `SDL_HINT_RENDER_SCALE_QUALITY` before creating the texture.
*
* \param renderer the rendering context.
* \param format one of the enumerated values in SDL_PixelFormatEnum.
* \param access one of the enumerated values in SDL_TextureAccess.
* \param w the width of the texture in pixels.
* \param h the height of the texture in pixels.
* \returns a pointer to the created texture or NULL if no rendering context
* was active, the format was unsupported, or the width or height
* were out of range; call SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTextureFromSurface
* \sa SDL_DestroyTexture
* \sa SDL_QueryTexture
* \sa SDL_UpdateTexture
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTexture(SDL_Renderer * renderer,
Uint32 format,
int access, int w,
int h);
/**
* Create a texture from an existing surface.
*
* The surface is not modified or freed by this function.
*
* The SDL_TextureAccess hint for the created texture is
* `SDL_TEXTUREACCESS_STATIC`.
*
* The pixel format of the created texture may be different from the pixel
* format of the surface. Use SDL_QueryTexture() to query the pixel format of
* the texture.
*
* \param renderer the rendering context.
* \param surface the SDL_Surface structure containing pixel data used to fill
* the texture.
* \returns the created texture or NULL on failure; call SDL_GetError() for
* more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
* \sa SDL_DestroyTexture
* \sa SDL_QueryTexture
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface);
/**
* Query the attributes of a texture.
*
* \param texture the texture to query.
* \param format a pointer filled in with the raw format of the texture; the
* actual format may differ, but pixel transfers will use this
* format (one of the SDL_PixelFormatEnum values). This argument
* can be NULL if you don't need this information.
* \param access a pointer filled in with the actual access to the texture
* (one of the SDL_TextureAccess values). This argument can be
* NULL if you don't need this information.
* \param w a pointer filled in with the width of the texture in pixels. This
* argument can be NULL if you don't need this information.
* \param h a pointer filled in with the height of the texture in pixels. This
* argument can be NULL if you don't need this information.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
*/
extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_Texture * texture,
Uint32 * format, int *access,
int *w, int *h);
/**
* Set an additional color value multiplied into render copy operations.
*
* When this texture is rendered, during the copy operation each source color
* channel is modulated by the appropriate color value according to the
* following formula:
*
* `srcC = srcC * (color / 255)`
*
* Color modulation is not always supported by the renderer; it will return -1
* if color modulation is not supported.
*
* \param texture the texture to update.
* \param r the red color value multiplied into copy operations.
* \param g the green color value multiplied into copy operations.
* \param b the blue color value multiplied into copy operations.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureColorMod
* \sa SDL_SetTextureAlphaMod
*/
extern DECLSPEC int SDLCALL SDL_SetTextureColorMod(SDL_Texture * texture,
Uint8 r, Uint8 g, Uint8 b);
/**
* Get the additional color value multiplied into render copy operations.
*
* \param texture the texture to query.
* \param r a pointer filled in with the current red color value.
* \param g a pointer filled in with the current green color value.
* \param b a pointer filled in with the current blue color value.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureAlphaMod
* \sa SDL_SetTextureColorMod
*/
extern DECLSPEC int SDLCALL SDL_GetTextureColorMod(SDL_Texture * texture,
Uint8 * r, Uint8 * g,
Uint8 * b);
/**
* Set an additional alpha value multiplied into render copy operations.
*
* When this texture is rendered, during the copy operation the source alpha
* value is modulated by this alpha value according to the following formula:
*
* `srcA = srcA * (alpha / 255)`
*
* Alpha modulation is not always supported by the renderer; it will return -1
* if alpha modulation is not supported.
*
* \param texture the texture to update.
* \param alpha the source alpha value multiplied into copy operations.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureAlphaMod
* \sa SDL_SetTextureColorMod
*/
extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture,
Uint8 alpha);
/**
* Get the additional alpha value multiplied into render copy operations.
*
* \param texture the texture to query.
* \param alpha a pointer filled in with the current alpha value.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureColorMod
* \sa SDL_SetTextureAlphaMod
*/
extern DECLSPEC int SDLCALL SDL_GetTextureAlphaMod(SDL_Texture * texture,
Uint8 * alpha);
/**
* Set the blend mode for a texture, used by SDL_RenderCopy().
*
* If the blend mode is not supported, the closest supported mode is chosen
* and this function returns -1.
*
* \param texture the texture to update.
* \param blendMode the SDL_BlendMode to use for texture blending.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureBlendMode
* \sa SDL_RenderCopy
*/
extern DECLSPEC int SDLCALL SDL_SetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode blendMode);
/**
* Get the blend mode used for texture copy operations.
*
* \param texture the texture to query.
* \param blendMode a pointer filled in with the current SDL_BlendMode.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetTextureBlendMode
*/
extern DECLSPEC int SDLCALL SDL_GetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode *blendMode);
/**
* Set the scale mode used for texture scale operations.
*
* If the scale mode is not supported, the closest supported mode is chosen.
*
* \param texture The texture to update.
* \param scaleMode the SDL_ScaleMode to use for texture scaling.
* \returns 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_GetTextureScaleMode
*/
extern DECLSPEC int SDLCALL SDL_SetTextureScaleMode(SDL_Texture * texture,
SDL_ScaleMode scaleMode);
/**
* Get the scale mode used for texture scale operations.
*
* \param texture the texture to query.
* \param scaleMode a pointer filled in with the current scale mode.
* \return 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_SetTextureScaleMode
*/
extern DECLSPEC int SDLCALL SDL_GetTextureScaleMode(SDL_Texture * texture,
SDL_ScaleMode *scaleMode);
/**
* Associate a user-specified pointer with a texture.
*
* \param texture the texture to update.
* \param userdata the pointer to associate with the texture.
* \returns 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_GetTextureUserData
*/
extern DECLSPEC int SDLCALL SDL_SetTextureUserData(SDL_Texture * texture,
void *userdata);
/**
* Get the user-specified pointer associated with a texture
*
* \param texture the texture to query.
* \return the pointer associated with the texture, or NULL if the texture is
* not valid.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_SetTextureUserData
*/
extern DECLSPEC void * SDLCALL SDL_GetTextureUserData(SDL_Texture * texture);
/**
* Update the given texture rectangle with new pixel data.
*
* The pixel data must be in the pixel format of the texture. Use
* SDL_QueryTexture() to query the pixel format of the texture.
*
* This is a fairly slow function, intended for use with static textures that
* do not change often.
*
* If the texture is intended to be updated often, it is preferred to create
* the texture as streaming and use the locking functions referenced below.
* While this function will work with streaming textures, for optimization
* reasons you may not get the pixels back if you lock the texture afterward.
*
* \param texture the texture to update.
* \param rect an SDL_Rect structure representing the area to update, or NULL
* to update the entire texture.
* \param pixels the raw pixel data in the format of the texture.
* \param pitch the number of bytes in a row of pixel data, including padding
* between lines.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
* \sa SDL_LockTexture
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const void *pixels, int pitch);
/**
* Update a rectangle within a planar YV12 or IYUV texture with new pixel
* data.
*
* You can use SDL_UpdateTexture() as long as your pixel data is a contiguous
* block of Y and U/V planes in the proper order, but this function is
* available if your pixel data is not contiguous.
*
* \param texture the texture to update.
* \param rect a pointer to the rectangle of pixels to update, or NULL to
* update the entire texture.
* \param Yplane the raw pixel data for the Y plane.
* \param Ypitch the number of bytes between rows of pixel data for the Y
* plane.
* \param Uplane the raw pixel data for the U plane.
* \param Upitch the number of bytes between rows of pixel data for the U
* plane.
* \param Vplane the raw pixel data for the V plane.
* \param Vpitch the number of bytes between rows of pixel data for the V
* plane.
* \returns 0 on success or -1 if the texture is not valid; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.1.
*
* \sa SDL_UpdateTexture
*/
extern DECLSPEC int SDLCALL SDL_UpdateYUVTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *Uplane, int Upitch,
const Uint8 *Vplane, int Vpitch);
/**
* Update a rectangle within a planar NV12 or NV21 texture with new pixels.
*
* You can use SDL_UpdateTexture() as long as your pixel data is a contiguous
* block of NV12/21 planes in the proper order, but this function is available
* if your pixel data is not contiguous.
*
* \param texture the texture to update.
* \param rect a pointer to the rectangle of pixels to update, or NULL to
* update the entire texture.
* \param Yplane the raw pixel data for the Y plane.
* \param Ypitch the number of bytes between rows of pixel data for the Y
* plane.
* \param UVplane the raw pixel data for the UV plane.
* \param UVpitch the number of bytes between rows of pixel data for the UV
* plane.
* \return 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.16.
*/
extern DECLSPEC int SDLCALL SDL_UpdateNVTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *UVplane, int UVpitch);
/**
* Lock a portion of the texture for **write-only** pixel access.
*
* As an optimization, the pixels made available for editing don't necessarily
* contain the old texture data. This is a write-only operation, and if you
* need to keep a copy of the texture data you should do that at the
* application level.
*
* You must use SDL_UnlockTexture() to unlock the pixels and apply any
* changes.
*
* \param texture the texture to lock for access, which was created with
* `SDL_TEXTUREACCESS_STREAMING`.
* \param rect an SDL_Rect structure representing the area to lock for access;
* NULL to lock the entire texture.
* \param pixels this is filled in with a pointer to the locked pixels,
* appropriately offset by the locked area.
* \param pitch this is filled in with the pitch of the locked pixels; the
* pitch is the length of one row in bytes.
* \returns 0 on success or a negative error code if the texture is not valid
* or was not created with `SDL_TEXTUREACCESS_STREAMING`; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,
const SDL_Rect * rect,
void **pixels, int *pitch);
/**
* Lock a portion of the texture for **write-only** pixel access, and expose
* it as a SDL surface.
*
* Besides providing an SDL_Surface instead of raw pixel data, this function
* operates like SDL_LockTexture.
*
* As an optimization, the pixels made available for editing don't necessarily
* contain the old texture data. This is a write-only operation, and if you
* need to keep a copy of the texture data you should do that at the
* application level.
*
* You must use SDL_UnlockTexture() to unlock the pixels and apply any
* changes.
*
* The returned surface is freed internally after calling SDL_UnlockTexture()
* or SDL_DestroyTexture(). The caller should not free it.
*
* \param texture the texture to lock for access, which was created with
* `SDL_TEXTUREACCESS_STREAMING`.
* \param rect a pointer to the rectangle to lock for access. If the rect is
* NULL, the entire texture will be locked.
* \param surface this is filled in with an SDL surface representing the
* locked area.
* \returns 0 on success, or -1 if the texture is not valid or was not created
* with `SDL_TEXTUREACCESS_STREAMING`.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_LockTexture
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_LockTextureToSurface(SDL_Texture *texture,
const SDL_Rect *rect,
SDL_Surface **surface);
/**
* Unlock a texture, uploading the changes to video memory, if needed.
*
* **Warning**: Please note that SDL_LockTexture() is intended to be
* write-only; it will not guarantee the previous contents of the texture will
* be provided. You must fully initialize any area of a texture that you lock
* before unlocking it, as the pixels might otherwise be uninitialized memory.
*
* Which is to say: locking and immediately unlocking a texture can result in
* corrupted textures, depending on the renderer in use.
*
* \param texture a texture locked by SDL_LockTexture().
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_LockTexture
*/
extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);
/**
* Determine whether a renderer supports the use of render targets.
*
* \param renderer the renderer that will be checked.
* \returns SDL_TRUE if supported or SDL_FALSE if not.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetRenderTarget
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderTargetSupported(SDL_Renderer *renderer);
/**
* Set a texture as the current rendering target.
*
* Before using this function, you should check the
* `SDL_RENDERER_TARGETTEXTURE` bit in the flags of SDL_RendererInfo to see if
* render targets are supported.
*
* The default render target is the window for which the renderer was created.
* To stop rendering to a texture and render to the window again, call this
* function with a NULL `texture`. This will reset the renderer's viewport,
* clipping rectangle, and scaling settings to the state they were in before
* setting a non-NULL `texture` target, losing any changes made in the
* meantime.
*
* \param renderer the rendering context.
* \param texture the targeted texture, which must be created with the
* `SDL_TEXTUREACCESS_TARGET` flag, or NULL to render to the
* window instead of a texture.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetRenderTarget
*/
extern DECLSPEC int SDLCALL SDL_SetRenderTarget(SDL_Renderer *renderer,
SDL_Texture *texture);
/**
* Get the current render target.
*
* The default render target is the window for which the renderer was created,
* and is reported a NULL here.
*
* \param renderer the rendering context.
* \returns the current render target or NULL for the default render target.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetRenderTarget
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_GetRenderTarget(SDL_Renderer *renderer);
/**
* Set a device independent resolution for rendering.
*
* This function uses the viewport and scaling functionality to allow a fixed
* logical resolution for rendering, regardless of the actual output
* resolution. If the actual output resolution doesn't have the same aspect
* ratio the output rendering will be centered within the output display.
*
* If the output display is a window, mouse and touch events in the window
* will be filtered and scaled so they seem to arrive within the logical
* resolution. The SDL_HINT_MOUSE_RELATIVE_SCALING hint controls whether
* relative motion events are also scaled.
*
* If this function results in scaling or subpixel drawing by the rendering
* backend, it will be handled using the appropriate quality hints.
*
* \param renderer the renderer for which resolution should be set.
* \param w the width of the logical resolution.
* \param h the height of the logical resolution.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h);
/**
* Get device independent resolution for rendering.
*
* When using the main rendering target (eg no target texture is set): this
* may return 0 for `w` and `h` if the SDL_Renderer has never had its logical
* size set by SDL_RenderSetLogicalSize(). Otherwise it returns the logical
* width and height.
*
* When using a target texture: Never return 0 for `w` and `h` at first. Then
* it returns the logical width and height that are set.
*
* \param renderer a rendering context.
* \param w an int to be filled with the width.
* \param h an int to be filled with the height.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC void SDLCALL SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h);
/**
* Set whether to force integer scales for resolution-independent rendering.
*
* This function restricts the logical viewport to integer values - that is,
* when a resolution is between two multiples of a logical size, the viewport
* size is rounded down to the lower multiple.
*
* \param renderer the renderer for which integer scaling should be set.
* \param enable enable or disable the integer scaling for rendering.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.5.
*
* \sa SDL_RenderGetIntegerScale
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetIntegerScale(SDL_Renderer * renderer,
SDL_bool enable);
/**
* Get whether integer scales are forced for resolution-independent rendering.
*
* \param renderer the renderer from which integer scaling should be queried.
* \returns SDL_TRUE if integer scales are forced or SDL_FALSE if not and on
* failure; call SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.5.
*
* \sa SDL_RenderSetIntegerScale
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer);
/**
* Set the drawing area for rendering on the current target.
*
* When the window is resized, the viewport is reset to fill the entire new
* window size.
*
* \param renderer the rendering context.
* \param rect the SDL_Rect structure representing the drawing area, or NULL
* to set the viewport to the entire target.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetViewport
*/
extern DECLSPEC int SDLCALL SDL_RenderSetViewport(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* Get the drawing area for the current target.
*
* \param renderer the rendering context.
* \param rect an SDL_Rect structure filled in with the current drawing area.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetViewport
*/
extern DECLSPEC void SDLCALL SDL_RenderGetViewport(SDL_Renderer * renderer,
SDL_Rect * rect);
/**
* Set the clip rectangle for rendering on the specified target.
*
* \param renderer the rendering context for which clip rectangle should be
* set.
* \param rect an SDL_Rect structure representing the clip area, relative to
* the viewport, or NULL to disable clipping.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetClipRect
* \sa SDL_RenderIsClipEnabled
*/
extern DECLSPEC int SDLCALL SDL_RenderSetClipRect(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* Get the clip rectangle for the current target.
*
* \param renderer the rendering context from which clip rectangle should be
* queried.
* \param rect an SDL_Rect structure filled in with the current clipping area
* or an empty rectangle if clipping is disabled.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderIsClipEnabled
* \sa SDL_RenderSetClipRect
*/
extern DECLSPEC void SDLCALL SDL_RenderGetClipRect(SDL_Renderer * renderer,
SDL_Rect * rect);
/**
* Get whether clipping is enabled on the given renderer.
*
* \param renderer the renderer from which clip state should be queried.
* \returns SDL_TRUE if clipping is enabled or SDL_FALSE if not; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.4.
*
* \sa SDL_RenderGetClipRect
* \sa SDL_RenderSetClipRect
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderIsClipEnabled(SDL_Renderer * renderer);
/**
* Set the drawing scale for rendering on the current target.
*
* The drawing coordinates are scaled by the x/y scaling factors before they
* are used by the renderer. This allows resolution independent drawing with a
* single coordinate system.
*
* If this results in scaling or subpixel drawing by the rendering backend, it
* will be handled using the appropriate quality hints. For best results use
* integer scaling factors.
*
* \param renderer a rendering context.
* \param scaleX the horizontal scaling factor.
* \param scaleY the vertical scaling factor.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetScale
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetScale(SDL_Renderer * renderer,
float scaleX, float scaleY);
/**
* Get the drawing scale for the current target.
*
* \param renderer the renderer from which drawing scale should be queried.
* \param scaleX a pointer filled in with the horizontal scaling factor.
* \param scaleY a pointer filled in with the vertical scaling factor.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetScale
*/
extern DECLSPEC void SDLCALL SDL_RenderGetScale(SDL_Renderer * renderer,