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util: Add util_format_has_alpha(), enclose in extern C.

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This commit is contained in:
Michal Krol 2009-12-18 14:15:21 +01:00
parent b1580a1623
commit c35e5c19e7
1 changed files with 49 additions and 0 deletions
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49
src/gallium/auxiliary/util/u_format.h
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@ -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 */