util/transform: move over wl_output_transform helpers

These aren't really tied to wlr_output.

backend/drm/drm.c

@@ -19,6 +19,7 @@
 #include <wlr/types/wlr_matrix.h>
 #include <wlr/util/box.h>
 #include <wlr/util/log.h>
+#include <wlr/util/transform.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 #include "backend/drm/drm.h"

examples/fullscreen-shell.c

@@ -16,6 +16,7 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/util/box.h>
 #include <wlr/util/log.h>
+#include <wlr/util/transform.h>
 
 /**
  * A minimal fullscreen-shell server. It only supports rendering.

include/wlr/types/wlr_output.h

@@ -729,19 +729,4 @@ bool wlr_output_configure_primary_swapchain(struct wlr_output *output,
 struct wlr_render_pass *wlr_output_begin_render_pass(struct wlr_output *output,
 	struct wlr_output_state *state, int *buffer_age, struct wlr_render_timer *timer);
 
-
-/**
- * Returns the transform that, when composed with `tr`, gives
- * `WL_OUTPUT_TRANSFORM_NORMAL`.
- */
-enum wl_output_transform wlr_output_transform_invert(
-	enum wl_output_transform tr);
-
-/**
- * Returns a transform that, when applied, has the same effect as applying
- * sequentially `tr_a` and `tr_b`.
- */
-enum wl_output_transform wlr_output_transform_compose(
-	enum wl_output_transform tr_a, enum wl_output_transform tr_b);
-
 #endif

include/wlr/util/transform.h

@@ -0,0 +1,28 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_UTIL_TRANSFORM_H
+#define WLR_UTIL_TRANSFORM_H
+
+#include <wayland-server-protocol.h>
+
+/**
+ * Returns the transform that, when composed with `tr`, gives
+ * `WL_OUTPUT_TRANSFORM_NORMAL`.
+ */
+enum wl_output_transform wlr_output_transform_invert(
+	enum wl_output_transform tr);
+
+/**
+ * Returns a transform that, when applied, has the same effect as applying
+ * sequentially `tr_a` and `tr_b`.
+ */
+enum wl_output_transform wlr_output_transform_compose(
+	enum wl_output_transform tr_a, enum wl_output_transform tr_b);
+
+#endif

render/gles2/pass.c

@@ -4,6 +4,7 @@
 #include <pixman.h>
 #include <time.h>
 #include <wlr/types/wlr_matrix.h>
+#include <wlr/util/transform.h>
 #include "render/gles2.h"
 #include "types/wlr_matrix.h"
 

types/meson.build

@@ -8,7 +8,6 @@ wlr_files += files(
 	'output/render.c',
 	'output/state.c',
 	'output/swapchain.c',
-	'output/transform.c',
 	'scene/drag_icon.c',
 	'scene/subsurface_tree.c',
 	'scene/surface.c',

types/output/cursor.c

@@ -8,6 +8,7 @@
 #include <wlr/types/wlr_matrix.h>
 #include <wlr/util/log.h>
 #include <wlr/util/region.h>
+#include <wlr/util/transform.h>
 #include "render/allocator/allocator.h"
 #include "types/wlr_buffer.h"
 #include "types/wlr_output.h"

types/scene/surface.c

@@ -4,6 +4,7 @@
 #include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_fractional_scale_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
+#include <wlr/util/transform.h>
 #include "types/wlr_scene.h"
 
 static void handle_scene_buffer_outputs_update(

types/scene/wlr_scene.c

@@ -13,6 +13,7 @@
 #include <wlr/types/wlr_scene.h>
 #include <wlr/util/log.h>
 #include <wlr/util/region.h>
+#include <wlr/util/transform.h>
 #include "types/wlr_buffer.h"
 #include "types/wlr_output.h"
 #include "types/wlr_scene.h"

types/wlr_compositor.c

@@ -10,6 +10,7 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/util/log.h>
 #include <wlr/util/region.h>
+#include <wlr/util/transform.h>
 #include "types/wlr_buffer.h"
 #include "types/wlr_region.h"
 #include "types/wlr_subcompositor.h"

types/wlr_screencopy_v1.c

@@ -9,6 +9,7 @@
 #include <wlr/backend.h>
 #include <wlr/util/box.h>
 #include <wlr/util/log.h>
+#include <wlr/util/transform.h>
 #include "wlr-screencopy-unstable-v1-protocol.h"
 #include "render/pixel_format.h"
 #include "render/wlr_renderer.h"

util/meson.build

@@ -11,6 +11,6 @@ wlr_files += files(
 	'shm.c',
 	'time.c',
 	'token.c',
+	'transform.c',
 	'utf8.c',
 )
-

util/transform.c

@@ -1,4 +1,4 @@
-#include <wlr/types/wlr_output.h>
+#include <wlr/util/transform.h>
 
 enum wl_output_transform wlr_output_transform_invert(
 		enum wl_output_transform tr) {