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pixels: Add fourcc_to_pixman_fmt

dmabuf-import
Andri Yngvason 2021-09-19 19:54:23 +00:00
parent cf42f76f56
commit dad7312814
2 changed files with 74 additions and 1 deletions
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6
include/pixels.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019 Andri Yngvason
* Copyright (c) 2019 - 2021 Andri Yngvason
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -18,6 +18,8 @@
#include <stdint.h>
#include <unistd.h>
#include <pixman.h>
#include <stdbool.h>
struct rfb_pixel_format;
@ -31,3 +33,5 @@ int rfb_pixfmt_from_fourcc(struct rfb_pixel_format *dst, uint32_t src);
uint32_t rfb_pixfmt_to_fourcc(const struct rfb_pixel_format* fmt);
int pixel_size_from_fourcc(uint32_t fourcc);
bool fourcc_to_pixman_fmt(pixman_format_code_t* dst, uint32_t src);

69
src/pixels.c
View File

@ -247,3 +247,72 @@ int pixel_size_from_fourcc(uint32_t fourcc)
return 0;
}
bool fourcc_to_pixman_fmt(pixman_format_code_t* dst, uint32_t src)
{
assert(!(src & DRM_FORMAT_BIG_ENDIAN));
#define LOWER_R r
#define LOWER_G g
#define LOWER_B b
#define LOWER_A a
#define LOWER_X x
#define LOWER_
#define LOWER(x) LOWER_##x
#define CONCAT_(a, b) a ## b
#define CONCAT(a, b) CONCAT_(a, b)
#define FMT_DRM(x, y, z, v, a, b, c, d) DRM_FORMAT_##x##y##z##v##a##b##c##d
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define FMT_PIXMAN(x, y, z, v, a, b, c, d) \
CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(\
PIXMAN_, LOWER(x)), a), LOWER(y)), b), LOWER(z)), c), LOWER(v)), d)
#else
#define FMT_PIXMAN(x, y, z, v, a, b, c, d) \
CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(CONCAT(\
PIXMAN_, LOWER(v)), d), LOWER(z)), c), LOWER(y)), b), LOWER(x)), a)
#endif
switch (src) {
#define X(...) \
case FMT_DRM(__VA_ARGS__): *dst = FMT_PIXMAN(__VA_ARGS__); break
/* 32 bits */
X(A,R,G,B,8,8,8,8);
X(A,B,G,R,8,8,8,8);
X(X,R,G,B,8,8,8,8);
X(X,B,G,R,8,8,8,8);
X(R,G,B,A,8,8,8,8);
X(B,G,R,A,8,8,8,8);
X(R,G,B,X,8,8,8,8);
X(B,G,R,X,8,8,8,8);
/* 24 bits */
X(R,G,B,,8,8,8,);
X(B,G,R,,8,8,8,);
/* 16 bits */
X(R,G,B,,5,6,5,);
X(B,G,R,,5,6,5,);
/* These are incompatible on big endian */
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
X(A,R,G,B,1,5,5,5);
X(A,B,G,R,1,5,5,5);
X(X,R,G,B,1,5,5,5);
X(X,B,G,R,1,5,5,5);
X(A,R,G,B,4,4,4,4);
X(A,B,G,R,4,4,4,4);
X(X,R,G,B,4,4,4,4);
X(X,B,G,R,4,4,4,4);
#endif
#undef X
default: return false;
}
return true;
}