Add SWAY_DAMAGE_DEBUG

Setting it to "rerender" will always re-render everything
regardless of the damaged region. Setting it to "highlight" will
clear the screen and render only damaged regions.

1 files changed, 19 insertions, 0 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 964cfe00..3fa586d0 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -846,11 +846,24 @@ static void render_output(struct sway_output *output, struct timespec *when,
 
         wlr_renderer_begin(renderer, wlr_output->width, wlr_output->height);
 
+        bool damage_whole_before_swap = false;
         if (!pixman_region32_not_empty(damage)) {
                 // Output isn't damaged but needs buffer swap
                 goto renderer_end;
         }
 
+        const char *damage_debug = getenv("SWAY_DAMAGE_DEBUG");
+        if (damage_debug != NULL) {
+                if (strcmp(damage_debug, "highlight") == 0) {
+                        wlr_renderer_clear(renderer, (float[]){1, 1, 0, 1});
+                        damage_whole_before_swap = true;
+                } else if (strcmp(damage_debug, "rerender") == 0) {
+                        int width, height;
+                        wlr_output_transformed_resolution(wlr_output, &width, &height);
+                        pixman_region32_union_rect(damage, damage, 0, 0, width, height);
+                }
+        }
+
         struct sway_container *workspace = output_get_active_workspace(output);
 
         if (workspace->sway_workspace->fullscreen) {
@@ -905,6 +918,12 @@ renderer_end:
                         wlr_output->transform_matrix, 0, 0, 1);
         }
 
+        if (damage_whole_before_swap || root_container.sway_root->debug_tree) {
+                int width, height;
+                wlr_output_transformed_resolution(wlr_output, &width, &height);
+                pixman_region32_union_rect(damage, damage, 0, 0, width, height);
+        }
+
         wlr_renderer_scissor(renderer, NULL);
         wlr_renderer_end(renderer);
         if (!wlr_output_damage_swap_buffers(output->damage, when, damage)) {