SDL 1.2.15 is a minor bug fix release.

General Notes

Fixed assembly register clobbering in CPU info routines
Fixed memory stomp when using stretch blit on large images
Fixed pixel corruption with overlapping blits
SDL_JOYSTICK_DEVICE can be a colon separated list of joystick devices
Disabled MMX blitters since they don't compile on modern compilers

Unix Notes

Fixed crash in joystick code on newer Linux kernels
Fixed channel swizzling for ALSA target with 6-channel output
Use the OpenGL GLX_EXT_swap_control extension if available
XRandR support is disabled by default because it causes desktop reconfiguring. It can be enabled with the SDL_VIDEO_X11_XRANDR=1 environment variable, or by applying this patch: http://hg.libsdl.org/SDL/raw-rev/8ec3036098df

Windows Notes

Fixed SDL_GL_ACCELERATED_VISUAL handling
Fixed application state handling with ALT-Tab
Fixed occasional crash handling WM_ACTIVATEAPP in Direct X code
Fixed UTF-8 decoding of Russian characters

Mac OS X Notes

Fixed building and running on Mac OS X 10.7 (Lion)