diff options
| -rw-r--r-- | src/gallium/include/pipe/p_format.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/gallium/include/pipe/p_format.h b/src/gallium/include/pipe/p_format.h index 00aa02311c..d973fb357b 100644 --- a/src/gallium/include/pipe/p_format.h +++ b/src/gallium/include/pipe/p_format.h @@ -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 |