summaryrefslogtreecommitdiffstats
path: root/src/gallium/include
diff options
context:
space:
mode:
authorJosé Fonseca <[email protected]>2008-06-26 23:39:13 +0900
committerJosé Fonseca <[email protected]>2008-06-26 23:39:13 +0900
commit38d779a3e68bb0ed78135c868e5bd435e1d91fb5 (patch)
tree598e527875b30775d7e04045bbcc89513fe54195 /src/gallium/include
parentd378f7b3dfda3b549e4b02380e492671cc34bb59 (diff)
gallium: Describe pixel block.
Chars-per-pixel paradigm is not enough to represent compressed and yuv pixel formats.
Diffstat (limited to 'src/gallium/include')
-rw-r--r--src/gallium/include/pipe/p_format.h56
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 00aa02311c4..d973fb357be 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