From 72a33b736fdf2a03d45010182b16532df0753690 Mon Sep 17 00:00:00 2001
From: Tony Crisci <tony@dubstepdish.com>
Date: Mon, 14 Aug 2017 13:28:59 -0400
Subject: [PATCH] implement texture get buffer size

---
 include/wlr/render/interface.h |  4 ++++
 render/gles2/texture.c         | 13 +++++++++++++
 render/wlr_texture.c           |  5 +++++
 types/wlr_surface.c            | 12 ++++--------
 4 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
index 59ece8b1..f98c3bc2 100644
--- a/include/wlr/render/interface.h
+++ b/include/wlr/render/interface.h
@@ -46,6 +46,8 @@ struct wlr_texture_impl {
 		struct wl_resource *drm_buf);
 	void (*get_matrix)(struct wlr_texture *state,
 		float (*matrix)[16], const float (*projection)[16], int x, int y);
+	void (*get_buffer_size)(struct wlr_texture *texture,
+		struct wl_resource *resource, int *width, int *height);
 	void (*bind)(struct wlr_texture *texture);
 	void (*destroy)(struct wlr_texture *texture);
 };
@@ -53,5 +55,7 @@ struct wlr_texture_impl {
 void wlr_texture_init(struct wlr_texture *texture,
 		struct wlr_texture_impl *impl);
 void wlr_texture_bind(struct wlr_texture *texture);
+void wlr_texture_get_buffer_size(struct wlr_texture *texture,
+		struct wl_resource *resource, int *width, int *height);
 
 #endif
diff --git a/render/gles2/texture.c b/render/gles2/texture.c
index 1e80a8d6..1f4ae22c 100644
--- a/render/gles2/texture.c
+++ b/render/gles2/texture.c
@@ -218,6 +218,18 @@ static void gles2_texture_get_matrix(struct wlr_texture *_texture,
 	wlr_matrix_mul(projection, matrix, matrix);
 }
 
+static void gles2_texture_get_buffer_size(struct wlr_texture *texture, struct
+		wl_resource *resource, int *width, int *height) {
+	struct wl_shm_buffer *buffer = wl_shm_buffer_get(resource);
+	if (!buffer) {
+		wlr_log(L_ERROR, "getting buffer size is only implemented for shm buffers");
+		return;
+	}
+
+	*width = wl_shm_buffer_get_width(buffer);
+	*height = wl_shm_buffer_get_height(buffer);
+}
+
 static void gles2_texture_bind(struct wlr_texture *_texture) {
 	struct wlr_gles2_texture *texture = (struct wlr_gles2_texture *)_texture;
 	GL_CALL(glBindTexture(GL_TEXTURE_2D, texture->tex_id));
@@ -247,6 +259,7 @@ static struct wlr_texture_impl wlr_texture_impl = {
 	.update_shm = gles2_texture_update_shm,
 	.upload_drm = gles2_texture_upload_drm,
 	.get_matrix = gles2_texture_get_matrix,
+	.get_buffer_size = gles2_texture_get_buffer_size,
 	.bind = gles2_texture_bind,
 	.destroy = gles2_texture_destroy,
 };
diff --git a/render/wlr_texture.c b/render/wlr_texture.c
index f98284a1..9faea820 100644
--- a/render/wlr_texture.c
+++ b/render/wlr_texture.c
@@ -52,3 +52,8 @@ void wlr_texture_get_matrix(struct wlr_texture *texture,
 		float (*matrix)[16], const float (*projection)[16], int x, int y) {
 	texture->impl->get_matrix(texture, matrix, projection, x, y);
 }
+
+void wlr_texture_get_buffer_size(struct wlr_texture *texture, struct wl_resource
+		*resource, int *width, int *height) {
+	texture->impl->get_buffer_size(texture, resource, width, height);
+}
diff --git a/types/wlr_surface.c b/types/wlr_surface.c
index e862d00e..0861e2e8 100644
--- a/types/wlr_surface.c
+++ b/types/wlr_surface.c
@@ -126,6 +126,9 @@ static void surface_commit(struct wl_client *client,
 		surface->current.buffer = surface->pending.buffer;
 	}
 	if ((surface->pending.invalid & WLR_SURFACE_INVALID_SURFACE_DAMAGE)) {
+		int width, height;
+		wlr_texture_get_buffer_size(surface->texture, surface->current.buffer, &width, &height);
+
 		pixman_region32_union(&surface->current.surface_damage,
 				&surface->current.surface_damage,
 				&surface->pending.surface_damage);
@@ -140,16 +143,9 @@ static void surface_commit(struct wl_client *client,
 		pixman_region32_union(&surface->current.buffer_damage,
 			&surface->current.buffer_damage, &buffer_damage);
 
-		struct wl_shm_buffer *buffer = wl_shm_buffer_get(surface->current.buffer);
 		pixman_region32_intersect_rect(&surface->current.buffer_damage,
-			&surface->current.buffer_damage, 0, 0,
-			wl_shm_buffer_get_width(buffer),
-			wl_shm_buffer_get_height(buffer));
+			&surface->current.buffer_damage, 0, 0, width, height);
 
-		// TODO: Surface sizing is complicated
-		//pixman_region32_intersect_rect(&surface->current.surface_damage,
-		//		&surface->current.surface_damage,
-		//		0, 0, surface->width, surface->height);
 		pixman_region32_clear(&surface->pending.surface_damage);
 		pixman_region32_clear(&surface->pending.buffer_damage);
 	}