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docs: Add some notes about the CoglPixelFormat enums

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The pixel format enums didn't explain what order in memory the
components should be so it was difficult to use them.
This commit is contained in:
Neil Roberts 2010-01-27 12:06:22 +00:00
parent 9d45e9641c
commit 548ed1cdf2
1 changed files with 19 additions and 3 deletions
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22
cogl/cogl-types.h
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@ -120,8 +120,8 @@ typedef struct _CoglTextureVertex CoglTextureVertex;
* @COGL_PIXEL_FORMAT_RGB_565: RGB, 16 bits
* @COGL_PIXEL_FORMAT_RGBA_4444: RGBA, 16 bits
* @COGL_PIXEL_FORMAT_RGBA_5551: RGBA, 16 bits
* @COGL_PIXEL_FORMAT_YUV: FIXME
* @COGL_PIXEL_FORMAT_G_8: FIXME
* @COGL_PIXEL_FORMAT_YUV: Not currently supported
* @COGL_PIXEL_FORMAT_G_8: Single luminance component
* @COGL_PIXEL_FORMAT_RGB_888: RGB, 24 bits
* @COGL_PIXEL_FORMAT_BGR_888: BGR, 24 bits
* @COGL_PIXEL_FORMAT_RGBA_8888: RGBA, 32 bits
@ -135,7 +135,23 @@ typedef struct _CoglTextureVertex CoglTextureVertex;
* @COGL_PIXEL_FORMAT_RGBA_4444_PRE: Premultiplied RGBA, 16 bits
* @COGL_PIXEL_FORMAT_RGBA_5551_PRE: Premultiplied RGBA, 16 bits
*
* Pixel formats used by COGL.
* Pixel formats used by COGL. For the formats with a byte per
* component, the order of the components specify the order in
* increasing memory addresses. So for example
* %COGL_PIXEL_FORMAT_RGB_888 would have the red component in the
* lowest address, green in the next address and blue after that
* regardless of the endinanness of the system.
*
* For the 16-bit formats the component order specifies the order
* within a 16-bit number from most significant bit to least
* significant. So for %COGL_PIXEL_FORMAT_RGB_565, the red component
* would be in bits 11-15, the green component would be in 6-11 and
* the blue component would be in 1-5. Therefore the order in memory
* depends on the endianness of the system.
*
* When uploading a texture %COGL_PIXEL_FORMAT_ANY can be used as the
* internal format. Cogl will try to pick the best format to use
* internally and convert the texture data if necessary.
*
* Since: 0.8
*/