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zimg: fix typos in a comment 

Also remove the "o" case, which was never implemented (probably was an
idea to output alpha formats, now obsoleted by zimg's full alpha
support).
This commit is contained in:
wm4 2020-02-12 17:54:35 +01:00
parent 5a45a4ca39
commit 0848f3f832
1 changed files with 2 additions and 3 deletions
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video/zimg.c
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@ -255,16 +255,15 @@ static int repack_align(void *user, unsigned i, unsigned x0, unsigned x1)
// Naming convention:
// pa_/un_ prefix to identify conversion direction.
// Left (LSB, lowest byte address) -> Right (MSB, highest byte address).
// (This is unusual; MSG to LSB is more commonly used to describe formats,
// (This is unusual; MSB to LSB is more commonly used to describe formats,
// but our convention makes more sense for byte access in little endian.)
// "c" identifies a color component.
// "z" identifies known zero padding.
// "o" identifies opaque alpha (unused/unsupported yet).
// "x" identifies uninitialized padding.
// A component is followed by its size in bits.
// Size can be omitted for multiple uniform components (c8c8c8 == ccc8).
// Unpackers will often use "x" for padding, because they ignore it, while
// packets will use "z" because they write zero.
// packers will use "z" because they write zero.
#define PA_WORD_4(name, packed_t, plane_t, sh_c0, sh_c1, sh_c2, sh_c3) \
static void name(void *dst, void *src[], int x0, int x1) { \