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pixels: Add more formats and take into account endianness

pixman-rendering
Andri Yngvason 2020-07-07 11:35:28 +00:00
parent 78c1616a46
commit c40cb823d6
1 changed files with 59 additions and 11 deletions
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70
src/pixels.c
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@ -21,6 +21,7 @@
#include <assert.h>
#include <libdrm/drm_fourcc.h>
#include <stdbool.h>
#include <endian.h>
enum wl_shm_format fourcc_to_wl_shm(uint32_t in)
{
@ -38,18 +39,65 @@ bool fourcc_to_pixman_fmt(pixman_format_code_t* dst, uint32_t src)
{
assert(!(src & DRM_FORMAT_BIG_ENDIAN));
/* TODO: Add more, perhaps with the help of
* https://github.com/afrantzis/pixel-format-guide
*/
#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 == __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)
#elif
#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) {
case DRM_FORMAT_ARGB8888: *dst = PIXMAN_a8r8g8b8; break;
case DRM_FORMAT_XRGB8888: *dst = PIXMAN_x8r8g8b8; break;
case DRM_FORMAT_ABGR8888: *dst = PIXMAN_a8b8g8r8; break;
case DRM_FORMAT_XBGR8888: *dst = PIXMAN_x8b8g8r8; break;
case DRM_FORMAT_RGBA8888: *dst = PIXMAN_r8g8b8a8; break;
case DRM_FORMAT_RGBX8888: *dst = PIXMAN_r8g8b8x8; break;
case DRM_FORMAT_BGRA8888: *dst = PIXMAN_b8g8r8a8; break;
case DRM_FORMAT_BGRX8888: *dst = PIXMAN_b8g8r8x8; break;
#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 == __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;
}