util: Helper function to determined whether two formats can be memcpy'ed.

These are the non-trivial conversions that this function recognizes,
which was produced by u_format_compatible_test.c:

  b8g8r8a8_unorm -> b8g8r8x8_unorm
  a8r8g8b8_unorm -> x8r8g8b8_unorm
  b5g5r5a1_unorm -> b5g5r5x1_unorm
  b4g4r4a4_unorm -> b4g4r4x4_unorm
  l8_unorm -> r8_unorm
  i8_unorm -> l8_unorm
  i8_unorm -> a8_unorm
  i8_unorm -> r8_unorm
  l16_unorm -> r16_unorm
  z24_unorm_s8_uscaled -> z24x8_unorm
  s8_uscaled_z24_unorm -> x8z24_unorm
  r8g8b8a8_unorm -> r8g8b8x8_unorm
  a8b8g8r8_srgb -> x8b8g8r8_srgb
  b8g8r8a8_srgb -> b8g8r8x8_srgb
  a8r8g8b8_srgb -> x8r8g8b8_srgb
  a8b8g8r8_unorm -> x8b8g8r8_unorm
  r10g10b10a2_uscaled -> r10g10b10x2_uscaled
  r10sg10sb10sa2u_norm -> r10g10b10x2_snorm

State trackers and pipe drivers should be updated to take advantage of
this knowledge, e.g., in surface_copy.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 59bd03b774..03b73c0e98 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -474,6 +474,15 @@ util_format_colormask(const struct util_format_description *desc)
 
 
 /**
+ * Whether the src format can be blitted to destation format with a simple
+ * memcpy.
+ */
+boolean
+util_is_format_compatible(const struct util_format_description *src_desc,
+                          const struct util_format_description *dst_desc);
+
+
+/**
  * Whether this format is a rgab8 variant.
  *
  * That is, any format that matches the