2 This is a list of API changes in SDL's version history.
7 Added cast macros for correct usage with C++:
8 SDL_reinterpret_cast(type, expression)
9 SDL_static_cast(type, expression)
11 Added SDL_DISABLE_LOCK_KEYS environment variable to enable normal
12 up/down events for Caps-Lock and Num-Lock keys.
15 Added SDL_BUTTON_X1 and SDL_BUTTON_X2 constants.
18 Added SDL_VIDEO_ALLOW_SCREENSAVER to override SDL's disabling
19 of the screensaver on Mac OS X and X11.
22 If SDL_OpenAudio() is passed zero for the desired format
23 fields, the following environment variables will be used
29 If an environment variable is not specified, it will be set
30 to a reasonable default value.
32 Added support for the SDL_VIDEO_FULLSCREEN_HEAD environment
33 variable, currently supported on X11 Xinerama configurations.
35 Added SDL_GL_SWAP_CONTROL to wait for vsync in OpenGL applications.
37 Added SDL_GL_ACCELERATED_VISUAL to guarantee hardware acceleration.
39 Added current_w and current_h to the SDL_VideoInfo structure,
40 which is set to the desktop resolution during video intialization,
41 and then set to the current resolution when a video mode is set.
43 SDL_SetVideoMode() now accepts 0 for width or height and will use
44 the current video mode (or the desktop mode if no mode has been set.)
46 Added SDL_GetKeyRepeat()
48 Added SDL_config.h, with defaults for various build environments.
51 Added CPU feature detection functions to SDL_cpuinfo.h:
52 SDL_HasRDTSC(), SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE(),
54 Added function to create RWops from const memory: SDL_RWFromConstMem()
57 Added SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject()
59 Added SDL_GL_MULTISAMPLEBUFFERS and SDL_GL_MULTISAMPLESAMPLES for FSAA
62 Added SDL_BUTTON_WHEELUP (4) and SDL_BUTTON_WHEELDOWN (5)
64 Added SDL_GL_STEREO for stereoscopic OpenGL contexts
67 Added SDL_VIDEOEXPOSE event to signal that the screen needs to
68 be redrawn. This is currently only delivered to OpenGL windows
69 on X11, though it may be delivered in the future when the video
70 memory is lost under DirectX.
73 You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
74 that has no title bar or frame decoration. Fullscreen video
75 modes automatically have this flag set.
77 Added a function to query the clipping rectangle for a surface:
78 void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
80 Added a function to query the current event filter:
81 SDL_EventFilter SDL_GetEventFilter(void)
83 If you pass -1 to SDL_ShowCursor(), it won't change the current
84 cursor visibility state, but will still return it.
86 SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
87 you can nest them as deep as you want, as long as each lock call
88 has a matching unlock call. The surface remains locked until the
89 last matching unlock call.
91 Note that you may not blit to or from a locked surface.
94 The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
95 arrays of Uint16 values instead of Uint8 values. For the most part,
96 you can just take your old values and shift them up 8 bits to get
97 new correct values for your gamma ramps.
99 You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
100 and SDL will try to RLE accelerate colorkey and alpha blits in the
104 Added a function to return the thread ID of a specific thread:
105 Uint32 SDL_GetThreadID(SDL_Thread *thread)
106 If 'thread' is NULL, this function returns the id for this thread.
109 The YUV overlay structure has been changed to use an array of
110 pitches and pixels representing the planes of a YUV image, to
111 better enable hardware acceleration. The YV12 and IYUV formats
112 each have three planes, corresponding to the Y, U, and V portions
113 of the image, while packed pixel YUV formats just have one plane.
115 For palettized mode (8bpp), the screen colormap is now split in
116 a physical and a logical palette. The physical palette determines
117 what colours the screen pixels will get when displayed, and the
118 logical palette controls the mapping from blits to/from the screen.
119 A new function, SDL_SetPalette() has been added to change
120 logical and physical palettes separately. SDL_SetColors() works
121 just as before, and is equivalent to calling SDL_SetPalette() with
122 a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
124 SDL_BlitSurface() no longer modifies the source rectangle, only the
125 destination rectangle. The width/height members of the destination
126 rectangle are ignored, only the position is used.
128 The old source clipping function SDL_SetClipping() has been replaced
129 with a more useful function to set the destination clipping rectangle:
130 SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
132 Added a function to see what subsystems have been initialized:
133 Uint32 SDL_WasInit(Uint32 flags)
135 The Big Alpha Flip: SDL now treats alpha as opacity like everybody
136 else, and not as transparency:
138 A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
139 A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
140 Values between 0 and 255 vary from fully transparent to fully opaque.
143 SDL_DisplayFormatAlpha()
144 Returns a surface converted to a format with alpha-channel
145 that can be blit efficiently to the screen. (In other words,
146 like SDL_DisplayFormat() but the resulting surface has
147 an alpha channel.) This is useful for surfaces with alpha.
149 Works as SDL_MapRGB() but takes an additional alpha parameter.
151 Works as SDL_GetRGB() but also returns the alpha value
152 (SDL_ALPHA_OPAQUE for formats without an alpha channel)
154 Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
155 the [0..255] interval. Previously, SDL_GetRGB() would return
156 (0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
157 (N.B.: This is broken for bit fields < 3 bits.)
159 SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
161 SDL_SetAlpha() can now be used for both setting the per-surface
162 alpha, using the new way of thinking of alpha, and also to enable
163 and disable per-pixel alpha blending for surfaces with an alpha
165 To disable alpha blending:
166 SDL_SetAlpha(surface, 0, 0);
167 To re-enable alpha blending:
168 SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
169 Surfaces with an alpha channel have blending enabled by default.
171 SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
172 RLE acceleration of blits, just as like with SDL_SetColorKey().
173 This flag can be set for both surfaces with an alpha channel
174 and surfaces with an alpha value set by SDL_SetAlpha().
175 As always, RLE surfaces must be locked before pixel access is
176 allowed, and unlocked before any other SDL operations are done
179 The blit semantics for surfaces with and without alpha and colorkey
180 have now been defined:
184 alpha-blend (using alpha-channel).
185 SDL_SRCCOLORKEY ignored.
186 SDL_SRCALPHA not set:
188 if SDL_SRCCOLORKEY set, only copy the pixels matching the
189 RGB values of the source colour key, ignoring alpha in the
194 alpha-blend (using the source per-surface alpha value);
195 set destination alpha to opaque.
196 SDL_SRCALPHA not set:
197 copy RGB, set destination alpha to opaque.
199 if SDL_SRCCOLORKEY set, only copy the pixels matching the
204 alpha-blend (using the source alpha channel) the RGB values;
205 leave destination alpha untouched. [Note: is this correct?]
206 SDL_SRCCOLORKEY ignored.
207 SDL_SRCALPHA not set:
208 copy all of RGBA to the destination.
209 if SDL_SRCCOLORKEY set, only copy the pixels matching the
210 RGB values of the source colour key, ignoring alpha in the
215 alpha-blend (using the source per-surface alpha value).
216 SDL_SRCALPHA not set:
219 if SDL_SRCCOLORKEY set, only copy the pixels matching the
222 As a special case, blits from surfaces with per-surface alpha
223 value of 128 (50% transparency) are optimised and much faster
224 than other alpha values. This does not apply to surfaces with
225 alpha channels (per-pixel alpha).
227 New functions for manipulating the gamma of the display have
229 int SDL_SetGamma(float red, float green, float blue);
230 int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
231 int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
232 Gamma ramps are tables with 256 entries which map the screen color
233 components into actually displayed colors. For an example of
234 implementing gamma correction and gamma fades, see test/testgamma.c
235 Gamma control is not supported on all hardware.
238 The size of the SDL_CDtrack structure changed from 8 to 12 bytes
239 as the size of the length member was extended to 32 bits.
241 You can now use SDL for 2D blitting with a GL mode by passing the
242 SDL_OPENGLBLIT flag to SDL_SetVideoMode(). You can specify 16 or
243 32 bpp, and the data in the framebuffer is put into the GL scene
244 when you call SDL_UpdateRects(), and the scene will be visible
245 when you call SDL_GL_SwapBuffers().
247 Run the "testgl" test program with the -logo command line option
248 to see an example of this blending of 2D and 3D in SDL.
251 Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
253 Added resizable window support - just add SDL_RESIZABLE to the
254 SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
255 See SDL_events.h for details on the new SDL_ResizeEvent structure.
257 Added condition variable support, based on mutexes and semaphores.
264 The new function prototypes are in SDL_mutex.h
266 Added counting semaphore support, based on the mutex primitive.
267 SDL_CreateSemaphore()
268 SDL_DestroySemaphore()
274 The new function prototypes are in SDL_mutex.h
276 Added support for asynchronous blitting. To take advantage of this,
277 you must set the SDL_ASYNCBLIT flag when setting the video mode and
278 creating surfaces that you want accelerated in this way. You must
279 lock surfaces that have this flag set, and the lock will block until
280 any queued blits have completed.
282 Added YUV video overlay support.
283 The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
284 This function creates an overlay surface:
285 SDL_CreateYUVOverlay()
286 You must lock and unlock the overlay to get access to the data:
287 SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
288 You can then display the overlay:
289 SDL_DisplayYUVOverlay()
290 You must free the overlay when you are done using it:
292 See SDL_video.h for the full function prototypes.
294 The joystick hat position constants have been changed:
295 Old constant New constant
296 ------------ ------------
306 The new constants are bitmasks, so you can check for the
307 individual axes like this:
308 if ( hat_position & SDL_HAT_UP ) {
310 and you'll catch left-up, up, and right-up.
313 Added multiple timer support:
314 SDL_AddTimer() and SDL_RemoveTimer()
316 SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
319 Added initial OpenGL support.
320 First set GL attributes (such as RGB depth, alpha depth, etc.)
321 SDL_GL_SetAttribute()
322 Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
323 Perform all of your normal GL drawing.
324 Finally swap the buffers with the new SDL function:
326 See the new 'testgl' test program for an example of using GL with SDL.
328 You can load GL extension functions by using the function:
329 SDL_GL_LoadProcAddress()
331 Added functions to initialize and cleanup specific SDL subsystems:
332 SDL_InitSubSystem() and SDL_QuitSubSystem()
334 Added user-defined event type:
341 This structure is in the "user" member of an SDL_Event.
343 Added a function to push events into the event queue:
346 Example of using the new SDL user-defined events:
350 event.type = SDL_USEREVENT;
351 event.user.code = my_event_code;
352 event.user.data1 = significant_data;
353 event.user.data2 = 0;
354 SDL_PushEvent(&event);
357 Added a function to get mouse deltas since last query:
358 SDL_GetRelativeMouseState()
360 Added a boolean datatype to SDL_types.h:
361 SDL_bool = { SDL_TRUE, SDL_FALSE }
363 Added a function to get the current audio status:
370 Added an AAlib driver (ASCII Art) - by Stephane Peter.
373 The input grab state is reset after each call to SDL_SetVideoMode().
374 The input is grabbed by default in fullscreen mode, and ungrabbed in
375 windowed mode. If you want to set input grab to a particular value,
376 you should set it after each call to SDL_SetVideoMode().
379 Exposed SDL_AudioInit(), SDL_VideoInit()
380 Added SDL_AudioDriverName() and SDL_VideoDriverName()
382 Added new window manager function:
383 SDL_WM_ToggleFullScreen()
384 This is currently implemented only on Linux
386 The ALT-ENTER code has been removed - it's not appropriate for a
387 lib to bind keys when they aren't even emergency escape sequences.
389 ALT-ENTER functionality can be implemented with the following code:
391 int Handle_AltEnter(const SDL_Event *event)
393 if ( event->type == SDL_KEYDOWN ) {
394 if ( (event->key.keysym.sym == SDLK_RETURN) &&
395 (event->key.keysym.mod & KMOD_ALT) ) {
396 SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
402 SDL_SetEventFilter(Handle_AltEnter);
405 Under X11, if you grab the input and hide the mouse cursor,
406 the mouse will go into a "relative motion" mode where you
407 will always get relative motion events no matter how far in
408 each direction you move the mouse - relative motion is not
409 bounded by the edges of the window (though the absolute values
410 of the mouse positions are clamped by the size of the window).
411 The SVGAlib, framebuffer console, and DirectInput drivers all
412 have this behavior naturally, and the GDI and BWindow drivers
413 never go into "relative motion" mode.
416 Added a function to enable keyboard repeat:
417 SDL_EnableKeyRepeat()
419 Added a function to grab the mouse and keyboard input
422 Added a function to iconify the window.
423 SDL_WM_IconifyWindow()
424 If this function succeeds, the application will receive an event
425 signaling SDL_APPACTIVE event
428 Added constants to SDL_audio.h for 16-bit native byte ordering:
429 AUDIO_U16SYS, AUDIO_S16SYS
437 A new function SDL_GetVideoSurface() has been added, and returns
438 a pointer to the current display surface.
440 SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
441 a new function SDL_CreateRGBSurfaceFrom() has been added to allow
442 creating an SDL surface from an existing pixel data buffer.
444 Added SDL_GetRGB() to the headers and documentation.
447 SDL_SetLibraryPath() is no longer meaningful, and has been removed.
450 A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
451 installing fatal signal handlers on operating systems that support
457 SDL_CreateColorCursor() has been removed. Color cursors should
458 be implemented as sprites, blitted by the application when the
459 cursor moves. To get smooth color cursor updates when the app
460 is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init(). This
461 allows you to handle the mouse motion in another thread from an
462 event filter function, but is currently only supported by Linux
463 and BeOS. Note that you'll have to protect the display surface
464 from multi-threaded access by using mutexes if you do this.
466 Thread-safe surface support has been removed from SDL.
467 This makes blitting somewhat faster, by removing SDL_MiddleBlit().
468 Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
469 You can make your surfaces thread-safe by allocating your own
470 mutex and making lock/unlock calls around accesses to your surface.
473 SDL_GetMouseState() now takes pointers to int rather than Uint16.
475 If you set the SDL_WINDOWID environment variable under UNIX X11,
476 SDL will use that as the main window instead of creating it's own.
477 This is an unsupported extension to SDL, and not portable at all.
480 Added a function SDL_SetLibraryPath() which can be used to specify
481 the directory containing the SDL dynamic libraries. This is useful
482 for commercial applications which ship with particular versions
483 of the libraries, and for security on multi-user systems.
484 If this function is not used, the default system directories are
485 searched using the native dynamic object loading mechanism.
487 In order to support C linkage under Visual C++, you must declare
488 main() without any return type:
489 main(int argc, char *argv[]) {
490 /* Do the program... */
493 C++ programs should also return a value if compiled under VC++.
495 The blit_endian member of the SDL_VideoInfo struct has been removed.
497 SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
498 is now no longer any function to translate a keysym to a character.
500 The SDL_keysym structure has been extended with a 'scancode' and
501 'unicode' member. The 'scancode' is a hardware specific scancode
502 for the key that was pressed, and may be 0. The 'unicode' member
503 is a 16-bit UNICODE translation of the key that was pressed along
504 with any modifiers or compose keys that have been pressed.
505 If no UNICODE translation exists for the key, 'unicode' will be 0.
507 Added a function SDL_EnableUNICODE() to enable/disable UNICODE
508 translation of character keypresses. Translation defaults off.
510 To convert existing code to use the new API, change code which
511 uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
512 and change code which uses it to get the ASCII value of a sym to
513 use the 'unicode' member of the event keysym.
516 There is partial support for 64-bit datatypes. I don't recommend
517 you use this if you have a choice, because 64-bit datatypes are not
518 supported on many platforms. On platforms for which it is supported,
519 the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
520 you can use the Uint64 and Sint64 datatypes.
522 Added functions to SDL_endian.h to support 64-bit datatypes:
523 SDL_SwapLE64(), SDL_SwapBE64(),
524 SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
526 A new member "len_ratio" has been added to the SDL_AudioCVT structure,
527 and allows you to determine either the original buffer length or the
528 converted buffer length, given the other.
530 A new function SDL_FreeWAV() has been added to the API to free data
531 allocated by SDL_LoadWAV_RW(). This is necessary under Win32 since
532 the gcc compiled DLL uses a different heap than VC++ compiled apps.
534 SDL now has initial support for international keyboards using the
536 If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
537 compile-time variable, or you can set the environment variable
538 "SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
539 The valid values for these variables can be found in SDL_keyboard.c
541 Full support for German and French keyboards under X11 is implemented.
544 The THREADED_EVENTS compile-time define has been replaced with the
545 SDL_INIT_EVENTTHREAD flag. If this flag is passed to SDL_Init(),
546 SDL will create a separate thread to perform input event handling.
547 If this flag is passed to SDL_Init(), and the OS doesn't support
548 event handling in a separate thread, SDL_Init() will fail.
549 Be sure to add calls to SDL_Delay() in your main thread to allow
550 the OS to schedule your event thread, or it may starve, leading
551 to slow event delivery and/or dropped events.
552 Currently MacOS and Win32 do not support this flag, while BeOS
553 and Linux do support it. I recommend that your application only
554 use this flag if absolutely necessary.
556 The SDL thread function passed to SDL_CreateThread() now returns a
557 status. This status can be retrieved by passing a non-NULL pointer
558 as the 'status' argument to SDL_WaitThread().
560 The volume parameter to SDL_MixAudio() has been increased in range
561 from (0-8) to (0-128)
563 SDL now has a data source abstraction which can encompass a file,
564 an area of memory, or any custom object you can envision. It uses
565 these abstractions, SDL_RWops, in the endian read/write functions,
566 and the built-in WAV and BMP file loaders. This means you can load
567 WAV chunks from memory mapped files, compressed archives, network
568 pipes, or anything else that has a data read abstraction.
570 There are three built-in data source abstractions:
571 SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
572 along with a generic data source allocation function:
574 These data sources can be used like stdio file pointers with the
575 following convenience functions:
576 SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
577 These functions are defined in the new header file "SDL_rwops.h"
579 The endian swapping functions have been turned into macros for speed
580 and SDL_CalculateEndian() has been removed. SDL_endian.h now defines
581 SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
582 the endianness of the host system.
584 The endian read/write functions now take an SDL_RWops pointer
585 instead of a stdio FILE pointer, to support the new data source
588 The SDL_*LoadWAV() functions have been replaced with a single
589 SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
590 first parameter, and a flag whether or not to automatically
591 free it as the second parameter. SDL_LoadWAV() is a macro for
592 backward compatibility and convenience:
593 SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
595 The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
596 with a single function that takes a SDL_RWops pointer as it's
597 first parameter, and a flag whether or not to automatically
598 free it as the second parameter. SDL_LoadBMP() and SDL_SaveBMP()
599 are macros for backward compatibility and convenience:
600 SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
601 SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
602 Note that these functions use SDL_RWseek() extensively, and should
603 not be used on pipes or other non-seekable data sources.
606 The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been
607 extended to support multiple types of display drivers, as well as
608 safe access to the X11 display when THREADED_EVENTS is enabled.
609 The new structures are documented in the SDL_syswm.h header file.
611 Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
612 should now work properly, as well as the "Windows" keys on US
615 The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
616 instead of trying to open each block device on the system.
617 The CD must be listed in /etc/fstab as using the iso9660 filesystem.
619 On Linux, if you define THREADED_EVENTS at compile time, a separate
620 thread will be spawned to gather X events asynchronously from the
621 graphics updates. This hasn't been extensively tested, but it does
622 provide a means of handling keyboard and mouse input in a separate
623 thread from the graphics thread. (This is now enabled by default.)
625 A special access function SDL_PeepEvents() allows you to manipulate
626 the event queue in a thread-safe manner, including peeking at events,
627 removing events of a specified type, and adding new events of arbitrary
628 type to the queue (use the new 'user' member of the SDL_Event type).
630 If you use SDL_PeepEvents() to gather events, then the main graphics
631 thread needs to call SDL_PumpEvents() periodically to drive the event
632 loop and generate input events. This is not necessary if SDL has been
633 compiled with THREADED_EVENTS defined, but doesn't hurt.
635 A new function SDL_ThreadID() returns the identifier associated with
639 The AUDIO_STEREO format flag has been replaced with a new 'channels'
640 member of the SDL_AudioSpec structure. The channels are 1 for mono
641 audio, and 2 for stereo audio. In the future more channels may be
642 supported for 3D surround sound.
644 The SDL_MixAudio() function now takes an additional volume parameter,
645 which should be set to SDL_MIX_MAXVOLUME for compatibility with the
648 The CD-ROM functions which take a 'cdrom' parameter can now be
649 passed NULL, and will act on the last successfully opened CD-ROM.
652 No changes, bugfixes only.
655 No changes, bugfixes only.
658 Added a fast rectangle fill function: SDL_FillRect()
660 Addition of a useful function for getting info on the video hardware:
661 const SDL_VideoInfo *SDL_GetVideoInfo(void)
662 This function replaces SDL_GetDisplayFormat().
664 Initial support for double-buffering:
665 Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
666 Update the screen with a new function: SDL_Flip()
668 SDL_AllocSurface() takes two new flags:
669 SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
670 and if the hardware supports hardware acceleration of colorkey blits
671 between two surfaces in video memory, to place the surface in video
672 memory if possible, otherwise it will be placed in system memory.
673 SDL_SRCALPHA means that the surface will be used for alpha blits and
674 if the hardware supports hardware acceleration of alpha blits between
675 two surfaces in video memory, to place the surface in video memory
676 if possible, otherwise it will be placed in system memory.
677 SDL_HWSURFACE now means that the surface will be created with the
678 same format as the display surface, since having surfaces in video
679 memory is only useful for fast blitting to the screen, and you can't
680 blit surfaces with different surface formats in video memory.
683 You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
684 that the icon consists of the entire image.
686 SDL_LowerBlit() is back -- but don't use it on the display surface.
687 It is exactly the same as SDL_MiddleBlit(), but doesn't check for
690 Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
691 a FILE pointer instead of a file name.
693 Added CD-ROM audio control API:
707 No changes, bugfixes only.
710 Mouse motion event now includes relative motion information:
711 Sint16 event->motion.xrel, Sint16 event->motion.yrel
713 X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
714 (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
717 No changes, bugfixes only.
720 Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
721 automatically mapped on blit.