ALLEGRO_PIXEL_FORMAT
typedef enum ALLEGRO_PIXEL_FORMAT
Pixel formats. Each pixel format specifies the exact size and bit layout of a pixel in memory. Components are specified from high bits to low bits, so for example a fully opaque red pixel in ARGB_8888 format is 0xFFFF0000.
Note:
The pixel format is independent of endianness. That is, in the above example you can always get the red component with
(pixel & 0x00ff0000) >> 16But you can not rely on this code:
*(pixel + 2)
It will return the red component on little endian systems, but the green component on big endian systems.
Also note that Allegro's naming is different from OpenGL naming here, where a format of GL_RGBA8 merely defines the component order and the exact layout including endianness treatment is specified separately. Usually GL_RGBA8 will correspond to ALLEGRO_PIXEL_ABGR_8888 though on little endian systems, so care must be taken (note the reversal of RGBA <-> ABGR).
The only exception to this ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE which will always have the components as 4 bytes corresponding to red, green, blue and alpha, in this order, independent of the endianness.
- ALLEGRO_PIXEL_FORMAT_ANY - Let the driver choose a format. This is the default format at program start.
- ALLEGRO_PIXEL_FORMAT_ANY_NO_ALPHA - Let the driver choose a format without alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_WITH_ALPHA - Let the driver choose a format with alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_15_NO_ALPHA - Let the driver choose a 15 bit format without alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_15_WITH_ALPHA - Let the driver choose a 15 bit format with alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_16_NO_ALPHA - Let the driver choose a 16 bit format without alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_16_WITH_ALPHA - Let the driver choose a 16 bit format with alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_24_NO_ALPHA - Let the driver choose a 24 bit format without alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_24_WITH_ALPHA - Let the driver choose a 24 bit format with alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_32_NO_ALPHA - Let the driver choose a 32 bit format without alpha.
- ALLEGRO_PIXEL_FORMAT_ANY_32_WITH_ALPHA - Let the driver choose a 32 bit format with alpha.
- ALLEGRO_PIXEL_FORMAT_ARGB_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_RGBA_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_ARGB_4444 - 16 bit
- ALLEGRO_PIXEL_FORMAT_RGB_888 - 24 bit
- ALLEGRO_PIXEL_FORMAT_RGB_565 - 16 bit
- ALLEGRO_PIXEL_FORMAT_RGB_555 - 15 bit
- ALLEGRO_PIXEL_FORMAT_RGBA_5551 - 16 bit
- ALLEGRO_PIXEL_FORMAT_ARGB_1555 - 16 bit
- ALLEGRO_PIXEL_FORMAT_ABGR_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_XBGR_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_BGR_888 - 24 bit
- ALLEGRO_PIXEL_FORMAT_BGR_565 - 16 bit
- ALLEGRO_PIXEL_FORMAT_BGR_555 - 15 bit
- ALLEGRO_PIXEL_FORMAT_RGBX_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_XRGB_8888 - 32 bit
- ALLEGRO_PIXEL_FORMAT_ABGR_F32 - 128 bit
- ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE - Like the version without _LE, but the component order is guaranteed to be red, green, blue, alpha. This only makes a difference on big endian systems, on little endian it is just an alias.
See also: al_set_new_bitmap_format, al_get_bitmap_format
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