swaybg: implement scaling mode "stretch"

1 files changed, 24 insertions, 3 deletions

diff --git a/swaybg/main.c b/swaybg/main.c
index cb9cc42b..5510f2ef 100644
--- a/swaybg/main.c
+++ b/swaybg/main.c
@@ -12,6 +12,10 @@ list_t *surfaces;
 
 struct registry *registry;
 
+enum scaling_mode_t {
+        SCALING_MODE_STRETCH,
+};
+
 void sway_terminate(void) {
         int i;
         for (i = 0; i < surfaces->length; ++i) {
@@ -49,16 +53,33 @@ int main(int argc, const char **argv) {
         desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
         list_add(surfaces, window);
 
-        const char *scaling_mode = argv[3];
         cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]);
         double width = cairo_image_surface_get_width(image);
         double height = cairo_image_surface_get_height(image);
 
+        const char *scaling_mode_str = argv[3];
+        enum scaling_mode_t scaling_mode;
+        if (strcmp(scaling_mode_str, "stretch") == 0) {
+                scaling_mode = SCALING_MODE_STRETCH;
+        } else {
+                sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
+        }
+
         for (i = 0; i < surfaces->length; ++i) {
                 struct window *window = surfaces->items[i];
                 if (window_prerender(window) && window->cairo) {
-                        cairo_scale(window->cairo, window->width / width, window->height / height);
-                        cairo_set_source_surface(window->cairo, image, 0, 0);
+
+                        switch (scaling_mode) {
+                                case SCALING_MODE_STRETCH:
+                                        cairo_scale(window->cairo,
+                                                        (double) window->width / width,
+                                                        (double) window->height / height);
+                                        cairo_set_source_surface(window->cairo, image, 0, 0);
+                                        break;
+                                default:
+                                        sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
+                        }
+
                         cairo_paint(window->cairo);
 
                         window_render(window);