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gallium: Describe pixel block.

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Chars-per-pixel paradigm is not enough to represent compressed and yuv
pixel formats.
This commit is contained in:
José Fonseca 2008-06-26 23:39:13 +09:00
parent d378f7b3df
commit 38d779a3e6
1 changed files with 56 additions and 0 deletions
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56
src/gallium/include/pipe/p_format.h
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@ -445,6 +445,62 @@ static INLINE uint pf_get_size( enum pipe_format format )
return pf_get_bits(format) / 8;
}
/**
* Describe accurately the pixel format.
*
* The chars-per-pixel concept falls apart with compressed and yuv images, where
* more than one pixel are coded in a single data block. This structure
* describes that block.
*
* Simple pixel formats are effectively a 1x1xcpp block.
*/
struct pipe_format_block
{
/** Block size in bytes */
unsigned size;
/** Block width in pixels */
unsigned width;
/** Block height in pixels */
unsigned height;
};
/**
* Describe pixel format's block.
*
* @sa http://msdn2.microsoft.com/en-us/library/ms796147.aspx
*/
static INLINE void
pf_get_block(enum pipe_format format, struct pipe_format_block *block)
{
switch(format) {
case PIPE_FORMAT_DXT1_RGBA:
case PIPE_FORMAT_DXT1_RGB:
block->size = 8;
block->width = 4;
block->height = 4;
break;
case PIPE_FORMAT_DXT3_RGBA:
case PIPE_FORMAT_DXT5_RGBA:
block->size = 16;
block->width = 4;
block->height = 4;
break;
case PIPE_FORMAT_YCBCR:
case PIPE_FORMAT_YCBCR_REV:
block->size = 4; /* 2*cpp */
block->width = 2;
block->height = 1;
break;
default:
block->size = pf_get_size(format);
block->width = 1;
block->height = 1;
break;
}
}
#ifdef __cplusplus
}
#endif