The main developers this time were: Trent Gamblin, Paul Suntsov, Peter Wang.

Changes from 5.0.9 to 5.0.10 (June 2013)
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Core:

- Register system interface even if no display driver available on Windows.

Displays:

- Don't crash in al_create_display if there is no display driver.

- Don't crash at shutdown if there is no display driver (Windows).

- Don't fail init if both D3D, GL drivers unavailable (Windows).

- Run fullscreen toggle on main thread (OS X).

- Destroy the backbuffer bitmap when destroying the display (OS X).

- Switch to new NSTrackingArea API (OS X).

- Check availability of fullscreen button on window frame at run-time (OS X).

Graphics:

- Add ALLEGRO_SRC_COLOR, ALLEGRO_DEST_COLOR, ALLEGRO_INVERSE_SRC_COLOR, ALLEGRO_INVERSE_DEST_COLOR blending modes (initially by Jon Rafkind and Elias Pschernig).

- Let al_destroy_bitmap implicitly untarget the bitmap on the calling thread.

- Use memory bitmap drawing when either bitmap is locked (OpenGL).

- Add const qualifiers to glUniform*v() functions (Aaron Bolyard).

Input:

- al_set_mouse_xy on Windows resulted in the mouse getting set to the wrong position in windowed modes.

- Scale the user supplied mouse cursor if it's too big (Windows).

- Fix mouse warping on OS X.

- Fix mouse warping in Linux evdev mouse driver.

Audio addon:

- pulseaudio: Use smaller buffer size by default, and make it configurable.

- pulseaudio: Clean up state transitions.

- Fix looping in Ogg Vorbis stream (Todd Cope).

- Enable the use of the unpatched DirectX SDK to build Allegro with MinGW.

Color addon:

- Fix al_color_rgb_to_html blue component (Jeff Bernard).

Font addons:

- Make al_init_ttf_addon return true for subsequent calls.

Primitives addon:

- Disallow 3 component vectors for ALLEGRO_PRIM_TEX_COORD.

- Check that the vertex declaration is valid before creating it.

- Respect filter settings of textures in the D3D backend.

Build system:

- Do not install most internal header files.

- Do not search for and link with unneeded X libraries.

Examples:

- ex_audio_timer: New example.

Other:

- Minor fixes.

- Various documentation updates.

- A lot of code refactoring.