backend/drm: remove wlr_drm_surface.{width,height}

This information is stored in wlr_swapchain, no need to duplicate
it.

backend/drm/renderer.c

@@ -48,47 +48,43 @@ void finish_drm_renderer(struct wlr_drm_renderer *renderer) {
 	wlr_renderer_destroy(renderer->wlr_rend);
 }
 
+static void finish_drm_surface(struct wlr_drm_surface *surf) {
+	if (!surf || !surf->renderer) {
+		return;
+	}
+
+	wlr_swapchain_destroy(surf->swapchain);
+
+	memset(surf, 0, sizeof(*surf));
+}
+
 bool init_drm_surface(struct wlr_drm_surface *surf,
-		struct wlr_drm_renderer *renderer, uint32_t width, uint32_t height,
+		struct wlr_drm_renderer *renderer, int width, int height,
 		const struct wlr_drm_format *drm_format) {
-	if (surf->width == width && surf->height == height) {
+	if (surf->swapchain->width == width && surf->swapchain->height == height) {
 		return true;
 	}
 
-	surf->renderer = renderer;
-	surf->width = width;
-	surf->height = height;
-
-	wlr_swapchain_destroy(surf->swapchain);
-	surf->swapchain = NULL;
+	finish_drm_surface(surf);
 
 	surf->swapchain = wlr_swapchain_create(renderer->allocator, width, height,
 			drm_format);
 	if (surf->swapchain == NULL) {
 		wlr_log(WLR_ERROR, "Failed to create swapchain");
-		memset(surf, 0, sizeof(*surf));
 		return false;
 	}
 
-	return true;
-}
-
-static void finish_drm_surface(struct wlr_drm_surface *surf) {
-	if (!surf || !surf->renderer) {
-		return;
-	}
-
-	wlr_swapchain_destroy(surf->swapchain);
+	surf->renderer = renderer;
 
-	memset(surf, 0, sizeof(*surf));
+	return true;
 }
 
 struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
 		struct wlr_buffer *buffer) {
 	struct wlr_renderer *renderer = surf->renderer->wlr_rend;
 
-	if (surf->width != (uint32_t)buffer->width ||
-			surf->height != (uint32_t)buffer->height) {
+	if (surf->swapchain->width != buffer->width ||
+			surf->swapchain->height != buffer->height) {
 		wlr_log(WLR_ERROR, "Surface size doesn't match buffer size");
 		return NULL;
 	}
@@ -106,7 +102,7 @@ struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
 
 	float mat[9];
 	wlr_matrix_identity(mat);
-	wlr_matrix_scale(mat, surf->width, surf->height);
+	wlr_matrix_scale(mat, surf->swapchain->width, surf->swapchain->height);
 
 	if (!wlr_renderer_begin_with_buffer(renderer, dst)) {
 		wlr_buffer_unlock(dst);

include/backend/drm/renderer.h

@@ -19,10 +19,6 @@ struct wlr_drm_renderer {
 
 struct wlr_drm_surface {
 	struct wlr_drm_renderer *renderer;
-
-	uint32_t width;
-	uint32_t height;
-
 	struct wlr_swapchain *swapchain;
 };
 
@@ -40,7 +36,7 @@ bool init_drm_renderer(struct wlr_drm_backend *drm,
 void finish_drm_renderer(struct wlr_drm_renderer *renderer);
 
 bool init_drm_surface(struct wlr_drm_surface *surf,
-	struct wlr_drm_renderer *renderer, uint32_t width, uint32_t height,
+	struct wlr_drm_renderer *renderer, int width, int height,
 	const struct wlr_drm_format *drm_format);
 
 bool drm_fb_import(struct wlr_drm_fb **fb, struct wlr_drm_backend *drm,