pixman-renderer: pass initial size explicitly

In a journey to decouple renderer from weston_output, pass the initial
framebuffer size to Pixman-renderer explicitly.

Now Pixman-renderer will never look into weston_output::current_mode.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/backend-drm/drm.c

@@ -1186,6 +1186,7 @@ drm_output_init_pixman(struct drm_output *output, struct drm_backend *b)
 	unsigned int i;
 	const struct pixman_renderer_output_options options = {
 		.use_shadow = b->use_pixman_shadow,
+		.fb_size = { .width = w, .height = h },
 	};
 
 	switch (format) {

libweston/backend-headless/headless.c

@@ -235,6 +235,10 @@ headless_output_enable_pixman(struct headless_output *output)
 	const struct pixel_format_info *pfmt;
 	const struct pixman_renderer_output_options options = {
 		.use_shadow = true,
+		.fb_size = {
+			.width = output->base.current_mode->width,
+			.height = output->base.current_mode->height
+		},
 	};
 
 	pfmt = pixel_format_get_info(headless_formats[0]);

libweston/backend-rdp/rdp.c

@@ -345,7 +345,7 @@ rdp_switch_mode(struct weston_output *output, struct weston_mode *target_mode)
 	rdpSettings *settings;
 	pixman_image_t *new_shadow_buffer;
 	struct weston_mode *local_mode;
-	const struct pixman_renderer_output_options options = { .use_shadow = true, };
+	struct pixman_renderer_output_options options = { .use_shadow = true, };
 
 	assert(output);
 
@@ -364,6 +364,9 @@ rdp_switch_mode(struct weston_output *output, struct weston_mode *target_mode)
 	output->current_mode->flags |= WL_OUTPUT_MODE_CURRENT;
 
 	pixman_renderer_output_destroy(output);
+
+	options.fb_size.width = output->current_mode->width;
+	options.fb_size.height = output->current_mode->height;
 	pixman_renderer_output_create(output, &options);
 
 	new_shadow_buffer = pixman_image_create_bits(PIXMAN_x8r8g8b8, target_mode->width,
@@ -442,6 +445,10 @@ rdp_output_enable(struct weston_output *base)
 	struct wl_event_loop *loop;
 	const struct pixman_renderer_output_options options = {
 		.use_shadow = true,
+		.fb_size = {
+			.width = output->base.current_mode->width,
+			.height = output->base.current_mode->height
+		},
 	};
 
 	assert(output);

libweston/backend-wayland/wayland.c

@@ -823,6 +823,10 @@ wayland_output_init_pixman_renderer(struct wayland_output *output)
 {
 	const struct pixman_renderer_output_options options = {
 		.use_shadow = true,
+		.fb_size = {
+			.width = output->base.current_mode->width,
+			.height = output->base.current_mode->height
+		},
 	};
 	return pixman_renderer_output_create(&output->base, &options);
 }

libweston/backend-x11/x11.c

@@ -859,6 +859,10 @@ x11_output_switch_mode(struct weston_output *base, struct weston_mode *mode)
 	if (b->use_pixman) {
 		const struct pixman_renderer_output_options options = {
 			.use_shadow = true,
+			.fb_size = {
+				.width = output->base.current_mode->width,
+				.height = output->base.current_mode->height
+			},
 		};
 		pixman_renderer_output_destroy(&output->base);
 		x11_output_deinit_shm(b, output);
@@ -1049,6 +1053,10 @@ x11_output_enable(struct weston_output *base)
 	if (b->use_pixman) {
 		const struct pixman_renderer_output_options options = {
 			.use_shadow = true,
+			.fb_size = {
+				.width = mode->width,
+				.height = mode->height
+			},
 		};
 		if (x11_output_init_shm(b, output,
 					mode->width, mode->height) < 0) {

libweston/pixman-renderer.c

@@ -986,12 +986,8 @@ pixman_renderer_output_create(struct weston_output *output,
 	struct weston_geometry area = {
 		.x = 0,
 		.y = 0,
-		.width = output->current_mode->width,
+		.width = options->fb_size.width,
-		.height = output->current_mode->height
+		.height = options->fb_size.height
-	};
-	struct weston_size fb_size = {
-		.width = area.width,
-		.height = area.height
 	};
 
 	po = zalloc(sizeof *po);
@@ -1003,7 +999,7 @@ pixman_renderer_output_create(struct weston_output *output,
 	if (options->use_shadow)
 		po->shadow_format = pixel_format_get_info(DRM_FORMAT_XRGB8888);
 
-	if (!pixman_renderer_resize_output(output, &fb_size, &area)) {
+	if (!pixman_renderer_resize_output(output, &options->fb_size, &area)) {
 		output->renderer_state = NULL;
 		free(po);
 		return -1;

libweston/pixman-renderer.h

@@ -35,6 +35,8 @@ pixman_renderer_init(struct weston_compositor *ec);
 struct pixman_renderer_output_options {
 	/** Composite into a shadow buffer, copying to the hardware buffer */
 	bool use_shadow;
+	/** Initial framebuffer size */
+	struct weston_size fb_size;
 };
 
 int