paint: add padding export option

paint/sources/box_export.c

@@ -7,6 +7,19 @@ bool                     _box_export_apply_displacement;
 bool                     _box_export_merge_vertices;
 
 void box_export_tab_export_textures_run(void *_) {
+
+	if (g_context->export_padding) {
+		i32 _dilate_radius = g_config->dilate_radius;
+		g_config->dilate_radius = 256;
+		slot_layer_t *_layer = g_context->layer;
+		for (i32 i = 0; i < project_layers->length; ++i) {
+			g_context->layer = project_layers->buffer[i];
+			render_path_paint_dilate(true, true);
+		}
+		g_context->layer = _layer;
+		g_config->dilate_radius = _dilate_radius;
+	}
+
 	export_texture_run(g_context->texture_export_path, _box_export_bake_material);
 }
 
@@ -138,6 +151,8 @@ void box_export_tab_export_textures(char *title, bool bake_material) {
 			box_export_preset = NULL;
 		}
 
+		ui_row2();
+
 		ui_handle_t *layers_destination_handle = ui_handle(__ID__);
 		layers_destination_handle->i           = g_context->layers_destination;
 
@@ -149,7 +164,9 @@ void box_export_tab_export_textures(char *title, bool bake_material) {
 		    2);
 		g_context->layers_destination = ui_combo(layers_destination_handle, layers_destination_combo, tr("Destination"), true, UI_ALIGN_LEFT, true);
 
-		ui_end_element();
+		ui_handle_t *h_padding = ui_handle(__ID__);
+		h_padding->b = g_context->export_padding;
+		g_context->export_padding = ui_check(h_padding, tr("Padding"), "");
 
 		ui_row2();
 		if (ui_icon_button(tr("Cancel"), ICON_CLOSE, UI_ALIGN_CENTER)) {

paint/sources/types.h

@@ -197,6 +197,7 @@ typedef struct context {
 	texture_ldr_format_t        format_type;
 	f32                         format_quality;
 	export_destination_t        layers_destination;
+	bool                        export_padding;
 	split_type_t                split_by;
 	f32                         select_time;
 	viewport_mode_t             viewport_mode;