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util/transform: move over wl_output_transform helpers

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These aren't really tied to wlr_output.
This commit is contained in:
Simon Ser 2023-05-03 12:32:44 +02:00
parent a3d22dbe97
commit 9e702e9cfe
13 changed files with 38 additions and 18 deletions
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2
util/meson.build
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@ -11,6 +11,6 @@ wlr_files += files(
'shm.c',
'time.c',
'token.c',
'transform.c',
'utf8.c',
)

25
util/transform.c Normal file
View file

@ -0,0 +1,25 @@
#include <wlr/util/transform.h>
enum wl_output_transform wlr_output_transform_invert(
enum wl_output_transform tr) {
if ((tr & WL_OUTPUT_TRANSFORM_90) && !(tr & WL_OUTPUT_TRANSFORM_FLIPPED)) {
tr ^= WL_OUTPUT_TRANSFORM_180;
}
return tr;
}
enum wl_output_transform wlr_output_transform_compose(
enum wl_output_transform tr_a, enum wl_output_transform tr_b) {
uint32_t flipped = (tr_a ^ tr_b) & WL_OUTPUT_TRANSFORM_FLIPPED;
uint32_t rotation_mask = WL_OUTPUT_TRANSFORM_90 | WL_OUTPUT_TRANSFORM_180;
uint32_t rotated;
if (tr_b & WL_OUTPUT_TRANSFORM_FLIPPED) {
// When a rotation of k degrees is followed by a flip, the
// equivalent transform is a flip followed by a rotation of
// -k degrees.
rotated = (tr_b - tr_a) & rotation_mask;
} else {
rotated = (tr_a + tr_b) & rotation_mask;
}
return flipped | rotated;
}