2 Simple DirectMedia Layer
3 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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.
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:
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.
25 * Header file for ::SDL_Surface definition and management functions.
28 #ifndef SDL_surface_h_
29 #define SDL_surface_h_
31 #include "SDL_stdinc.h"
32 #include "SDL_pixels.h"
34 #include "SDL_blendmode.h"
35 #include "SDL_rwops.h"
37 #include "begin_code.h"
38 /* Set up for C function definitions, even when using C++ */
46 * These are the currently supported flags for the ::SDL_Surface.
49 * Used internally (read-only).
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 #define SDL_SIMD_ALIGNED 0x00000008 /**< Surface uses aligned memory */
57 /* @} *//* Surface flags */
60 * Evaluates to true if the surface needs to be locked before access.
62 #define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0)
65 * \brief A collection of pixels used in software blitting.
67 * \note This structure should be treated as read-only, except for \c pixels,
68 * which, if not NULL, contains the raw pixel data for the surface.
70 typedef struct SDL_Surface
72 Uint32 flags; /**< Read-only */
73 SDL_PixelFormat *format; /**< Read-only */
74 int w, h; /**< Read-only */
75 int pitch; /**< Read-only */
76 void *pixels; /**< Read-write */
78 /** Application data associated with the surface */
79 void *userdata; /**< Read-write */
81 /** information needed for surfaces requiring locks */
82 int locked; /**< Read-only */
84 /** list of BlitMap that hold a reference to this surface */
85 void *list_blitmap; /**< Private */
87 /** clipping information */
88 SDL_Rect clip_rect; /**< Read-only */
90 /** info for fast blit mapping to other surfaces */
91 struct SDL_BlitMap *map; /**< Private */
93 /** Reference count -- used when freeing surface */
94 int refcount; /**< Read-mostly */
98 * \brief The type of function used for surface blitting functions.
100 typedef int (SDLCALL *SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect,
101 struct SDL_Surface * dst, SDL_Rect * dstrect);
104 * \brief The formula used for converting between YUV and RGB
108 SDL_YUV_CONVERSION_JPEG, /**< Full range JPEG */
109 SDL_YUV_CONVERSION_BT601, /**< BT.601 (the default) */
110 SDL_YUV_CONVERSION_BT709, /**< BT.709 */
111 SDL_YUV_CONVERSION_AUTOMATIC /**< BT.601 for SD content, BT.709 for HD content */
112 } SDL_YUV_CONVERSION_MODE;
115 * Allocate and free an RGB surface.
117 * If the depth is 4 or 8 bits, an empty palette is allocated for the surface.
118 * If the depth is greater than 8 bits, the pixel format is set using the
121 * If the function runs out of memory, it will return NULL.
123 * \param flags The \c flags are obsolete and should be set to 0.
124 * \param width The width in pixels of the surface to create.
125 * \param height The height in pixels of the surface to create.
126 * \param depth The depth in bits of the surface to create.
127 * \param Rmask The red mask of the surface to create.
128 * \param Gmask The green mask of the surface to create.
129 * \param Bmask The blue mask of the surface to create.
130 * \param Amask The alpha mask of the surface to create.
132 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface
133 (Uint32 flags, int width, int height, int depth,
134 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);
136 /* !!! FIXME for 2.1: why does this ask for depth? Format provides that. */
137 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormat
138 (Uint32 flags, int width, int height, int depth, Uint32 format);
140 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels,
149 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceWithFormatFrom
150 (void *pixels, int width, int height, int depth, int pitch, Uint32 format);
151 extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface);
154 * \brief Set the palette used by a surface.
156 * \return 0, or -1 if the surface format doesn't use a palette.
158 * \note A single palette can be shared with many surfaces.
160 extern DECLSPEC int SDLCALL SDL_SetSurfacePalette(SDL_Surface * surface,
161 SDL_Palette * palette);
164 * \brief Sets up a surface for directly accessing the pixels.
166 * Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write
167 * to and read from \c surface->pixels, using the pixel format stored in
168 * \c surface->format. Once you are done accessing the surface, you should
169 * use SDL_UnlockSurface() to release it.
171 * Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates
172 * to 0, then you can read and write to the surface at any time, and the
173 * pixel format of the surface will not change.
175 * No operating system or library calls should be made between lock/unlock
176 * pairs, as critical system locks may be held during this time.
178 * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.
180 * \sa SDL_UnlockSurface()
182 extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface);
183 /** \sa SDL_LockSurface() */
184 extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface);
187 * Load a surface from a seekable SDL data stream (memory or file).
189 * If \c freesrc is non-zero, the stream will be closed after being read.
191 * The new surface should be freed with SDL_FreeSurface().
193 * \return the new surface, or NULL if there was an error.
195 extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src,
199 * Load a surface from a file.
203 #define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
206 * Save a surface to a seekable SDL data stream (memory or file).
208 * Surfaces with a 24-bit, 32-bit and paletted 8-bit format get saved in the
209 * BMP directly. Other RGB formats with 8-bit or higher get converted to a
210 * 24-bit surface or, if they have an alpha mask or a colorkey, to a 32-bit
211 * surface before they are saved. YUV and paletted 1-bit and 4-bit formats are
214 * If \c freedst is non-zero, the stream will be closed after being written.
216 * \return 0 if successful or -1 if there was an error.
218 extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
219 (SDL_Surface * surface, SDL_RWops * dst, int freedst);
222 * Save a surface to a file.
226 #define SDL_SaveBMP(surface, file) \
227 SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
230 * \brief Sets the RLE acceleration hint for a surface.
232 * \return 0 on success, or -1 if the surface is not valid
234 * \note If RLE is enabled, colorkey and alpha blending blits are much faster,
235 * but the surface must be locked before directly accessing the pixels.
237 extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface,
241 * \brief Returns whether the surface is RLE enabled
243 * \return SDL_TRUE if the surface is RLE enabled, or SDL_FALSE if the surface is NULL or not RLE enabled
245 extern DECLSPEC SDL_bool SDLCALL SDL_HasSurfaceRLE(SDL_Surface * surface);
248 * \brief Sets the color key (transparent pixel) in a blittable surface.
250 * \param surface The surface to update
251 * \param flag Non-zero to enable colorkey and 0 to disable colorkey
252 * \param key The transparent pixel in the native surface format
254 * \return 0 on success, or -1 if the surface is not valid
256 * You can pass SDL_RLEACCEL to enable RLE accelerated blits.
258 extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface,
259 int flag, Uint32 key);
262 * \brief Returns whether the surface has a color key
264 * \return SDL_TRUE if the surface has a color key, or SDL_FALSE if the surface is NULL or has no color key
266 extern DECLSPEC SDL_bool SDLCALL SDL_HasColorKey(SDL_Surface * surface);
269 * \brief Gets the color key (transparent pixel) in a blittable surface.
271 * \param surface The surface to update
272 * \param key A pointer filled in with the transparent pixel in the native
275 * \return 0 on success, or -1 if the surface is not valid or colorkey is not
278 extern DECLSPEC int SDLCALL SDL_GetColorKey(SDL_Surface * surface,
282 * \brief Set an additional color value used in blit operations.
284 * \param surface The surface to update.
285 * \param r The red color value multiplied into blit operations.
286 * \param g The green color value multiplied into blit operations.
287 * \param b The blue color value multiplied into blit operations.
289 * \return 0 on success, or -1 if the surface is not valid.
291 * \sa SDL_GetSurfaceColorMod()
293 extern DECLSPEC int SDLCALL SDL_SetSurfaceColorMod(SDL_Surface * surface,
294 Uint8 r, Uint8 g, Uint8 b);
298 * \brief Get the additional color value used in blit operations.
300 * \param surface The surface to query.
301 * \param r A pointer filled in with the current red color value.
302 * \param g A pointer filled in with the current green color value.
303 * \param b A pointer filled in with the current blue color value.
305 * \return 0 on success, or -1 if the surface is not valid.
307 * \sa SDL_SetSurfaceColorMod()
309 extern DECLSPEC int SDLCALL SDL_GetSurfaceColorMod(SDL_Surface * surface,
310 Uint8 * r, Uint8 * g,
314 * \brief Set an additional alpha value used in blit operations.
316 * \param surface The surface to update.
317 * \param alpha The alpha value multiplied into blit operations.
319 * \return 0 on success, or -1 if the surface is not valid.
321 * \sa SDL_GetSurfaceAlphaMod()
323 extern DECLSPEC int SDLCALL SDL_SetSurfaceAlphaMod(SDL_Surface * surface,
327 * \brief Get the additional alpha value used in blit operations.
329 * \param surface The surface to query.
330 * \param alpha A pointer filled in with the current alpha value.
332 * \return 0 on success, or -1 if the surface is not valid.
334 * \sa SDL_SetSurfaceAlphaMod()
336 extern DECLSPEC int SDLCALL SDL_GetSurfaceAlphaMod(SDL_Surface * surface,
340 * \brief Set the blend mode used for blit operations.
342 * \param surface The surface to update.
343 * \param blendMode ::SDL_BlendMode to use for blit blending.
345 * \return 0 on success, or -1 if the parameters are not valid.
347 * \sa SDL_GetSurfaceBlendMode()
349 extern DECLSPEC int SDLCALL SDL_SetSurfaceBlendMode(SDL_Surface * surface,
350 SDL_BlendMode blendMode);
353 * \brief Get the blend mode used for blit operations.
355 * \param surface The surface to query.
356 * \param blendMode A pointer filled in with the current blend mode.
358 * \return 0 on success, or -1 if the surface is not valid.
360 * \sa SDL_SetSurfaceBlendMode()
362 extern DECLSPEC int SDLCALL SDL_GetSurfaceBlendMode(SDL_Surface * surface,
363 SDL_BlendMode *blendMode);
366 * Sets the clipping rectangle for the destination surface in a blit.
368 * If the clip rectangle is NULL, clipping will be disabled.
370 * If the clip rectangle doesn't intersect the surface, the function will
371 * return SDL_FALSE and blits will be completely clipped. Otherwise the
372 * function returns SDL_TRUE and blits to the surface will be clipped to
373 * the intersection of the surface area and the clipping rectangle.
375 * Note that blits are automatically clipped to the edges of the source
376 * and destination surfaces.
378 extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface,
379 const SDL_Rect * rect);
382 * Gets the clipping rectangle for the destination surface in a blit.
384 * \c rect must be a pointer to a valid rectangle which will be filled
385 * with the correct values.
387 extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
391 * Creates a new surface identical to the existing surface
393 extern DECLSPEC SDL_Surface *SDLCALL SDL_DuplicateSurface(SDL_Surface * surface);
396 * Creates a new surface of the specified format, and then copies and maps
397 * the given surface to it so the blit of the converted surface will be as
398 * fast as possible. If this function fails, it returns NULL.
400 * The \c flags parameter is passed to SDL_CreateRGBSurface() and has those
401 * semantics. You can also pass ::SDL_RLEACCEL in the flags parameter and
402 * SDL will try to RLE accelerate colorkey and alpha blits in the resulting
405 extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
406 (SDL_Surface * src, const SDL_PixelFormat * fmt, Uint32 flags);
407 extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurfaceFormat
408 (SDL_Surface * src, Uint32 pixel_format, Uint32 flags);
411 * \brief Copy a block of pixels of one format to another format
413 * \return 0 on success, or -1 if there was an error
415 extern DECLSPEC int SDLCALL SDL_ConvertPixels(int width, int height,
417 const void * src, int src_pitch,
419 void * dst, int dst_pitch);
422 * Performs a fast fill of the given rectangle with \c color.
424 * If \c rect is NULL, the whole surface will be filled with \c color.
426 * The color should be a pixel of the format used by the surface, and
427 * can be generated by the SDL_MapRGB() function.
429 * \return 0 on success, or -1 on error.
431 extern DECLSPEC int SDLCALL SDL_FillRect
432 (SDL_Surface * dst, const SDL_Rect * rect, Uint32 color);
433 extern DECLSPEC int SDLCALL SDL_FillRects
434 (SDL_Surface * dst, const SDL_Rect * rects, int count, Uint32 color);
437 * Performs a fast blit from the source surface to the destination surface.
439 * This assumes that the source and destination rectangles are
440 * the same size. If either \c srcrect or \c dstrect are NULL, the entire
441 * surface (\c src or \c dst) is copied. The final blit rectangles are saved
442 * in \c srcrect and \c dstrect after all clipping is performed.
444 * \return If the blit is successful, it returns 0, otherwise it returns -1.
446 * The blit function should not be called on a locked surface.
448 * The blit semantics for surfaces with and without blending and colorkey
449 * are defined as follows:
452 Source surface blend mode set to SDL_BLENDMODE_BLEND:
453 alpha-blend (using the source alpha-channel and per-surface alpha)
454 SDL_SRCCOLORKEY ignored.
455 Source surface blend mode set to SDL_BLENDMODE_NONE:
457 if SDL_SRCCOLORKEY set, only copy the pixels matching the
458 RGB values of the source color key, ignoring alpha in the
462 Source surface blend mode set to SDL_BLENDMODE_BLEND:
463 alpha-blend (using the source per-surface alpha)
464 Source surface blend mode set to SDL_BLENDMODE_NONE:
465 copy RGB, set destination alpha to source per-surface alpha value.
467 if SDL_SRCCOLORKEY set, only copy the pixels matching the
471 Source surface blend mode set to SDL_BLENDMODE_BLEND:
472 alpha-blend (using the source alpha-channel and per-surface alpha)
473 SDL_SRCCOLORKEY ignored.
474 Source surface blend mode set to SDL_BLENDMODE_NONE:
475 copy all of RGBA to the destination.
476 if SDL_SRCCOLORKEY set, only copy the pixels matching the
477 RGB values of the source color key, ignoring alpha in the
481 Source surface blend mode set to SDL_BLENDMODE_BLEND:
482 alpha-blend (using the source per-surface alpha)
483 Source surface blend mode set to SDL_BLENDMODE_NONE:
486 if SDL_SRCCOLORKEY set, only copy the pixels matching the
490 * You should call SDL_BlitSurface() unless you know exactly how SDL
491 * blitting works internally and how to use the other blit functions.
493 #define SDL_BlitSurface SDL_UpperBlit
496 * This is the public blit function, SDL_BlitSurface(), and it performs
497 * rectangle validation and clipping before passing it to SDL_LowerBlit()
499 extern DECLSPEC int SDLCALL SDL_UpperBlit
500 (SDL_Surface * src, const SDL_Rect * srcrect,
501 SDL_Surface * dst, SDL_Rect * dstrect);
504 * This is a semi-private blit function and it performs low-level surface
507 extern DECLSPEC int SDLCALL SDL_LowerBlit
508 (SDL_Surface * src, SDL_Rect * srcrect,
509 SDL_Surface * dst, SDL_Rect * dstrect);
512 * \brief Perform a fast, low quality, stretch blit between two surfaces of the
515 * \note This function uses a static buffer, and is not thread-safe.
517 extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
518 const SDL_Rect * srcrect,
520 const SDL_Rect * dstrect);
522 #define SDL_BlitScaled SDL_UpperBlitScaled
525 * This is the public scaled blit function, SDL_BlitScaled(), and it performs
526 * rectangle validation and clipping before passing it to SDL_LowerBlitScaled()
528 extern DECLSPEC int SDLCALL SDL_UpperBlitScaled
529 (SDL_Surface * src, const SDL_Rect * srcrect,
530 SDL_Surface * dst, SDL_Rect * dstrect);
533 * This is a semi-private blit function and it performs low-level surface
534 * scaled blitting only.
536 extern DECLSPEC int SDLCALL SDL_LowerBlitScaled
537 (SDL_Surface * src, SDL_Rect * srcrect,
538 SDL_Surface * dst, SDL_Rect * dstrect);
541 * \brief Set the YUV conversion mode
543 extern DECLSPEC void SDLCALL SDL_SetYUVConversionMode(SDL_YUV_CONVERSION_MODE mode);
546 * \brief Get the YUV conversion mode
548 extern DECLSPEC SDL_YUV_CONVERSION_MODE SDLCALL SDL_GetYUVConversionMode(void);
551 * \brief Get the YUV conversion mode, returning the correct mode for the resolution when the current conversion mode is SDL_YUV_CONVERSION_AUTOMATIC
553 extern DECLSPEC SDL_YUV_CONVERSION_MODE SDLCALL SDL_GetYUVConversionModeForResolution(int width, int height);
555 /* Ends C function definitions when using C++ */
559 #include "close_code.h"
561 #endif /* SDL_surface_h_ */
563 /* vi: set ts=4 sw=4 expandtab: */