feat(buffer): add file image support

include/buffer.h

@@ -19,6 +19,9 @@ void screencopy_frame_handle_ready(void *data,
                                    uint32_t tv_nsec);
 void screencopy_frame_handle_failed(void *data,
                                     struct zwlr_screencopy_frame_v1 *frame);
-bool buffer_init_from_screencopy(struct swappy_state *state);
 void screencopy_destroy_buffer(struct swappy_buffer *buffer);
+
+bool buffer_init_from_screencopy(struct swappy_state *state);
+bool buffer_init_from_file(struct swappy_state *state);
+
 bool buffer_parse_geometry(struct swappy_state *state);

include/swappy.h

@@ -106,6 +106,7 @@ struct swappy_state {
   struct swappy_state_ui *ui;
 
   cairo_surface_t *cairo_surface;
+  cairo_surface_t *image_surface;
 
   struct wl_display *display;
   struct wl_registry *registry;

src/application.c

@@ -155,6 +155,7 @@ void arrow_clicked_handler(GtkWidget *widget, struct swappy_state *state) {
 void application_finish(struct swappy_state *state) {
   paint_free_all(state);
   cairo_surface_destroy(state->cairo_surface);
+  cairo_surface_destroy(state->image_surface);
   g_free(state->storage_path);
   g_free(state->geometry_str);
   g_free(state->geometry);
@@ -541,6 +542,8 @@ static gboolean is_file_valid(const char *file) {
     return false;
   }
 
+  cairo_surface_destroy(surface);
+
   return true;
 }
 
@@ -561,6 +564,10 @@ static gint command_line_handler(GtkApplication *app,
     if (!is_file_valid(state->file_str)) {
       return EXIT_FAILURE;
     }
+
+    if (!buffer_init_from_file(state)) {
+      return EXIT_FAILURE;
+    }
   }
 
   if (!init_gtk_window(state)) {

src/buffer.c

@@ -174,6 +174,29 @@ bool buffer_init_from_screencopy(struct swappy_state *state) {
   return true;
 }
 
+bool buffer_init_from_file(struct swappy_state *state) {
+  char *file = state->file_str;
+
+  cairo_surface_t *surface = cairo_image_surface_create_from_png(file);
+
+  g_assert(surface);
+
+  int width = cairo_image_surface_get_width(surface);
+  int height = cairo_image_surface_get_height(surface);
+
+  struct swappy_box *geometry = g_new(struct swappy_box, 1);
+
+  geometry->x = 0;
+  geometry->y = 0;
+  geometry->width = (int32_t)width;
+  geometry->height = (int32_t)height;
+
+  state->geometry = geometry;
+  state->image_surface = surface;
+
+  return true;
+}
+
 bool buffer_parse_geometry(struct swappy_state *state) {
   struct swappy_box *geometry = g_new(struct swappy_box, 1);
   char *geometry_str = state->geometry_str;

src/render.c

@@ -209,6 +209,18 @@ static void render_buffer(cairo_t *cr, struct swappy_state *state) {
   }
 }
 
+static void render_image(cairo_t *cr, struct swappy_state *state) {
+  if (!state->image_surface) {
+    return;
+  }
+
+  cairo_pattern_t *output_pattern =
+      cairo_pattern_create_for_surface(state->image_surface);
+  cairo_set_source(cr, output_pattern);
+  cairo_pattern_destroy(output_pattern);
+  cairo_paint(cr);
+}
+
 static void render_background(cairo_t *cr) {
   cairo_set_source_rgb(cr, 0, 0, 0);
   cairo_paint(cr);
@@ -270,6 +282,7 @@ void render_state(struct swappy_state *state) {
 
   render_background(cr);
   render_buffer(cr, state);
+  render_image(cr, state);
   render_paints(cr, state);
 
   // Drawing is finished, notify the GtkDrawingArea it needs to be redrawn.