img: remove padding_x from lab_img_render()

padding_x in lab_img_render() was just to make sure window icons in the
titlebar doesn't get too close to adjacent buttons and it didn't felt
clean. To remove it from lab_img, this commit changes the size of window
icon buffers from (window.button.width)x(window.button.height) to
(window.button.width * 0.8)x(window.button.height) and horizontally
slide it by (window.button.width * 0.1) to keep the horizontal padding.

Note that the size of the hitbox for a window icon is kept the same and
nothing is changed from user's perspective.

src/common/scaled-img-buffer.c

@@ -15,7 +15,7 @@ _create_buffer(struct scaled_scene_buffer *scaled_buffer, double scale)
 {
 	struct scaled_img_buffer *self = scaled_buffer->data;
 	struct lab_data_buffer *buffer = lab_img_render(self->img,
-		self->width, self->height, self->padding, scale);
+		self->width, self->height, scale);
 	return buffer;
 }
 
@@ -36,8 +36,7 @@ _equal(struct scaled_scene_buffer *scaled_buffer_a,
 
 	return lab_img_equal(a->img, b->img)
 		&& a->width == b->width
-		&& a->height == b->height
-		&& a->padding == b->padding;
+		&& a->height == b->height;
 }
 
 static struct scaled_scene_buffer_impl impl = {
@@ -48,7 +47,7 @@ static struct scaled_scene_buffer_impl impl = {
 
 struct scaled_img_buffer *
 scaled_img_buffer_create(struct wlr_scene_tree *parent, struct lab_img *img,
-	int width, int height, int padding)
+	int width, int height)
 {
 	assert(img);
 	struct scaled_scene_buffer *scaled_buffer = scaled_scene_buffer_create(
@@ -59,7 +58,6 @@ scaled_img_buffer_create(struct wlr_scene_tree *parent, struct lab_img *img,
 	self->img = lab_img_copy(img);
 	self->width = width;
 	self->height = height;
-	self->padding = padding;
 
 	scaled_buffer->data = self;
 
@@ -70,14 +68,13 @@ scaled_img_buffer_create(struct wlr_scene_tree *parent, struct lab_img *img,
 
 void
 scaled_img_buffer_update(struct scaled_img_buffer *self, struct lab_img *img,
-	int width, int height, int padding)
+	int width, int height)
 {
 	assert(img);
 	lab_img_destroy(self->img);
 	self->img = lab_img_copy(img);
 	self->width = width;
 	self->height = height;
-	self->padding = padding;
 	scaled_scene_buffer_request_update(self->scaled_buffer, width, height);
 }
 

src/img/img-svg.c

@@ -36,7 +36,7 @@ img_svg_load(const char *filename)
 }
 
 struct lab_data_buffer *
-img_svg_render(RsvgHandle *svg, int w, int h, int padding_x, double scale)
+img_svg_render(RsvgHandle *svg, int w, int h, double scale)
 {
 	struct lab_data_buffer *buffer = buffer_create_cairo(w, h, scale);
 	cairo_surface_t *image = buffer->surface;
@@ -44,9 +44,7 @@ img_svg_render(RsvgHandle *svg, int w, int h, int padding_x, double scale)
 	GError *err = NULL;
 
 	RsvgRectangle viewport = {
-		.x = padding_x,
-		.y = 0,
-		.width = w - 2 * padding_x,
+		.width = w,
 		.height = h,
 	};
 	rsvg_handle_render_document(svg, cr, &viewport, &err);

src/img/img.c

@@ -119,7 +119,7 @@ lab_img_add_modifier(struct lab_img *img,  lab_img_modifier_func_t modifier)
  */
 static struct lab_data_buffer *
 render_cairo_surface(cairo_surface_t *surface, int width, int height,
-	int padding_x, double scale)
+	double scale)
 {
 	assert(surface);
 	int src_w = cairo_image_surface_get_width(surface);
@@ -130,9 +130,7 @@ render_cairo_surface(cairo_surface_t *surface, int width, int height,
 	cairo_t *cairo = cairo_create(buffer->surface);
 
 	struct wlr_box container = {
-		.x = padding_x,
-		.y = 0,
-		.width = width - 2 * padding_x,
+		.width = width,
 		.height = height,
 	};
 
@@ -151,8 +149,7 @@ render_cairo_surface(cairo_surface_t *surface, int width, int height,
 }
 
 struct lab_data_buffer *
-lab_img_render(struct lab_img *img, int width, int height, int padding,
-	double scale)
+lab_img_render(struct lab_img *img, int width, int height, double scale)
 {
 	struct lab_data_buffer *buffer = NULL;
 
@@ -162,12 +159,12 @@ lab_img_render(struct lab_img *img, int width, int height, int padding,
 	case LAB_IMG_XBM:
 	case LAB_IMG_XPM:
 		buffer = render_cairo_surface(img->data->buffer->surface,
-			width, height, padding, scale);
+			width, height, scale);
 		break;
 #if HAVE_RSVG
 	case LAB_IMG_SVG:
 		buffer = img_svg_render(img->data->svg, width, height,
-			padding, scale);
+			scale);
 		break;
 #endif
 	default:

src/ssd/ssd-part.c

@@ -108,7 +108,7 @@ add_scene_button(struct wl_list *part_list, enum ssd_part_type type,
 		struct ssd_part *icon_part = add_scene_part(part_list, type);
 		struct scaled_img_buffer *img_buffer = scaled_img_buffer_create(
 			parent, imgs[state_set], rc.theme->window_button_width,
-			rc.theme->window_button_height, /* padding_x */ 0);
+			rc.theme->window_button_height);
 		assert(img_buffer);
 		icon_part->node = &img_buffer->scene_buffer->node;
 		wlr_scene_node_set_enabled(icon_part->node, false);

src/ssd/ssd-titlebar.c

@@ -632,9 +632,9 @@ ssd_update_window_icon(struct ssd *ssd)
 				struct scaled_img_buffer *img_buffer =
 					scaled_img_buffer_from_node(node);
 				scaled_img_buffer_update(img_buffer, icon_img,
-					theme->window_button_width,
-					theme->window_button_height,
-					icon_padding);
+					theme->window_button_width - 2 * icon_padding,
+					theme->window_button_height);
+				wlr_scene_node_set_position(node, icon_padding, 0);
 			}
 		}
 	} FOR_EACH_END