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