Mesa (master): util: Add util_format_has_alpha(), enclose in extern C.
MichaŠKról
michal at kemper.freedesktop.org
Fri Dec 18 13:16:00 UTC 2009
Module: Mesa
Branch: master
Commit: c35e5c19e789329b506273de7f3cdcf28e28e112
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c35e5c19e789329b506273de7f3cdcf28e28e112
Author: Michal Krol <michal at vmware.com>
Date: Fri Dec 18 14:15:21 2009 +0100
util: Add util_format_has_alpha(), enclose in extern C.
---
src/gallium/auxiliary/util/u_format.h | 49 +++++++++++++++++++++++++++++++++
1 files changed, 49 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 97e4d95..c344c42 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -32,6 +32,10 @@
#include "pipe/p_format.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
/**
* Describe how to best pack/unpack pixels into/from the prescribed format.
@@ -345,6 +349,47 @@ util_format_get_component_bits(enum pipe_format format,
}
}
+static INLINE boolean
+util_format_has_alpha(enum pipe_format format)
+{
+ const struct util_format_description *desc = util_format_description(format);
+
+ assert(format);
+ if (!format) {
+ return FALSE;
+ }
+
+ switch (desc->layout) {
+ case UTIL_FORMAT_LAYOUT_SCALAR:
+ case UTIL_FORMAT_LAYOUT_ARITH:
+ case UTIL_FORMAT_LAYOUT_ARRAY:
+ /* FIXME: pf_get_component_bits( PIPE_FORMAT_A8L8_UNORM, PIPE_FORMAT_COMP_A ) should not return 0 right? */
+ if (format == PIPE_FORMAT_A8_UNORM ||
+ format == PIPE_FORMAT_A8L8_UNORM ||
+ format == PIPE_FORMAT_A8L8_SRGB) {
+ return TRUE;
+ }
+ return util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3) != 0;
+ case UTIL_FORMAT_LAYOUT_YUV:
+ return FALSE;
+ case UTIL_FORMAT_LAYOUT_DXT:
+ switch (format) {
+ case PIPE_FORMAT_DXT1_RGBA:
+ case PIPE_FORMAT_DXT3_RGBA:
+ case PIPE_FORMAT_DXT5_RGBA:
+ case PIPE_FORMAT_DXT1_SRGBA:
+ case PIPE_FORMAT_DXT3_SRGBA:
+ case PIPE_FORMAT_DXT5_SRGBA:
+ return TRUE;
+ default:
+ return FALSE;
+ }
+ default:
+ assert(0);
+ return FALSE;
+ }
+}
+
/*
* Format access functions.
@@ -374,4 +419,8 @@ util_format_write_4ub(enum pipe_format format,
void *dst, unsigned dst_stride,
unsigned x, unsigned y, unsigned w, unsigned h);
+#ifdef __cplusplus
+} // extern "C" {
+#endif
+
#endif /* ! U_FORMAT_H */
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