From 0615cd44c6ebe9e5e9435f2706a280842a18b33c Mon Sep 17 00:00:00 2001
From: Andri Yngvason <andri@yngvason.is>
Date: Fri, 26 Jun 2020 18:05:31 +0000
Subject: [PATCH] buffer: Add damage field

---
 include/buffer.h |  8 ++++++++
 src/buffer.c     | 22 ++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/include/buffer.h b/include/buffer.h
index 1c87a4b..25fda5f 100644
--- a/include/buffer.h
+++ b/include/buffer.h
@@ -5,6 +5,7 @@
 #include <unistd.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include <pixman.h>
 
 struct wl_buffer;
 struct gbm_bo;
@@ -27,6 +28,8 @@ struct wv_buffer {
 	uint32_t format;
 	bool y_inverted;
 
+	struct pixman_region16 damage;
+
 	/* The following is only applicable to DMABUF */
 	struct gbm_bo* bo;
 	void* bo_map_handle;
@@ -48,6 +51,11 @@ void wv_buffer_destroy(struct wv_buffer* self);
 int wv_buffer_map(struct wv_buffer* self);
 void wv_buffer_unmap(struct wv_buffer* self);
 
+void wv_buffer_damage_rect(struct wv_buffer* self, int x, int y, int width,
+		int height);
+void wv_buffer_damage_whole(struct wv_buffer* self);
+void wv_buffer_damage_clear(struct wv_buffer* self);
+
 struct wv_buffer_pool* wv_buffer_pool_create(enum wv_buffer_type, int width,
 		int height, int stride, uint32_t format);
 void wv_buffer_pool_destroy(struct wv_buffer_pool* pool);
diff --git a/src/buffer.c b/src/buffer.c
index 1830a9e..6f71df6 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -7,6 +7,7 @@
 #include <libdrm/drm_fourcc.h>
 #include <wayland-client.h>
 #include <gbm.h>
+#include <pixman.h>
 
 #include "linux-dmabuf-unstable-v1.h"
 #include "shm.h"
@@ -54,6 +55,8 @@ struct wv_buffer* wv_buffer_create_shm(int width,
 	if (!self->wl_buffer)
 		goto shm_failure;
 
+	pixman_region_init(&self->damage);
+
 	close(fd);
 	return self;
 
@@ -149,6 +152,7 @@ static void wv_buffer_destroy_dmabuf(struct wv_buffer* self)
 
 void wv_buffer_destroy(struct wv_buffer* self)
 {
+	pixman_region_fini(&self->damage);
 	wv_buffer_unmap(self);
 
 	switch (self->type) {
@@ -214,6 +218,23 @@ void wv_buffer_unmap(struct wv_buffer* self)
 	abort();
 }
 
+void wv_buffer_damage_rect(struct wv_buffer* self, int x, int y, int width,
+		int height)
+{
+	pixman_region_union_rect(&self->damage, &self->damage, x, y, width,
+			height);
+}
+
+void wv_buffer_damage_whole(struct wv_buffer* self)
+{
+	wv_buffer_damage_rect(self, 0, 0, self->width, self->height);
+}
+
+void wv_buffer_damage_clear(struct wv_buffer* self)
+{
+	pixman_region_clear(&self->damage);
+}
+
 struct wv_buffer_pool* wv_buffer_pool_create(enum wv_buffer_type type,
 		int width, int height, int stride, uint32_t format)
 {
@@ -304,6 +325,7 @@ struct wv_buffer* wv_buffer_pool_acquire(struct wv_buffer_pool* pool)
 void wv_buffer_pool_release(struct wv_buffer_pool* pool,
 		struct wv_buffer* buffer)
 {
+	wv_buffer_damage_clear(buffer);
 	wv_buffer_unmap(buffer);
 
 	if (wv_buffer_pool_match_buffer(pool, buffer)) {