main-executable: handle drawable-based app icons by rendering them into SVG

src/api-impl-jni/defines.h

@@ -35,6 +35,7 @@
 #define _GET_FLOAT_FIELD(object, field) ((*env)->GetFloatField(env, object, _FIELD_ID(_CLASS(object), field, "F")))
 #define _SET_FLOAT_FIELD(object, field, value) ((*env)->SetFloatField(env, object, _FIELD_ID(_CLASS(object), field, "F"), value))
 #define _SET_STATIC_INT_FIELD(class, field, value) ((*env)->SetStaticIntField(env, class, _STATIC_FIELD_ID(class, field, "I"), value))
+#define _SET_STATIC_BOOL_FIELD(class, field, value) ((*env)->SetStaticBooleanField(env, class, _STATIC_FIELD_ID(class, field, "Z"), value))
 #define _SET_STATIC_OBJ_FIELD(class, field, type, value) ((*env)->SetStaticObjectField(env, class, _STATIC_FIELD_ID(class, field, type), value))
 #define _GET_STATIC_OBJ_FIELD(class, field, type) ((*env)->GetStaticObjectField(env, class, _STATIC_FIELD_ID(class, field, type)))
 #define _GET_BYTE_ARRAY_ELEMENTS(b_array) ((*env)->GetByteArrayElements(env, b_array, NULL))

src/api-impl-jni/util.c

@@ -162,6 +162,7 @@ void set_up_handle_cache(JNIEnv *env)
 
 	handle_cache.application.class = _REF((*env)->FindClass(env, "android/app/Application"));
 	handle_cache.application.get_app_icon_path = _METHOD(handle_cache.application.class, "get_app_icon_path", "()Ljava/lang/String;");
+	handle_cache.application.get_app_icon_paintable = _METHOD(handle_cache.application.class, "get_app_icon_paintable", "()J");
 
 	handle_cache.looper.class = _REF((*env)->FindClass(env, "android/os/Looper"));
 	handle_cache.looper.loop = _STATIC_METHOD(handle_cache.looper.class, "loop", "()V");

src/api-impl-jni/util.h

@@ -107,6 +107,7 @@ struct handle_cache {
 	struct {
 		jclass class;
 		jmethodID get_app_icon_path;
+		jmethodID get_app_icon_paintable;
 	} application;
 	struct {
 		jclass class;

src/api-impl/android/app/Application.java

@@ -2,6 +2,7 @@ package android.app;
 
 import android.os.Bundle;
 import android.content.res.Configuration;
+import android.R;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.pm.PackageParser;
@@ -10,7 +11,22 @@ public class Application extends ContextWrapper {
 	public long native_window;
 
 	private String get_app_icon_path() {
-		return getString(pkg.applicationInfo.icon);
+		String icon_path = null;
+		try {
+			icon_path = getString(pkg.applicationInfo.icon);
+		} catch (android.content.res.Resources.NotFoundException e) {
+			e.printStackTrace();
+		}
+		if (icon_path == null) {
+			icon_path = getString(R.mipmap.sym_def_app_icon);
+		} else if (icon_path.endsWith(".xml")) {
+			icon_path = null;
+		}
+		return icon_path;
+	}
+
+	private long get_app_icon_paintable() {
+		return getPackageManager().getApplicationIcon(pkg.applicationInfo).paintable;
 	}
 
 	String get_app_label() {

src/api-impl/android/content/pm/PackageManager.java

@@ -2613,7 +2613,7 @@ public class PackageManager {
 	 * @see #getApplicationIcon(String)
 	 */
 	public Drawable getApplicationIcon(ApplicationInfo info) {
-		return null;
+		return Context.this_application.getDrawable(info.icon);
 	}
 
 	/**

src/main-executable/main.c

@@ -1,6 +1,7 @@
 // for dladdr
 #define _GNU_SOURCE
 
+#include <cairo-svg.h>
 #include <gdk/wayland/gdkwayland.h>
 #include <gtk/gtk.h>
 #include <libportal/portal.h>
@@ -176,6 +177,13 @@ static void dynamic_launcher_ready_callback(GObject *portal, GAsyncResult *res,
 	exit(0);
 }
 
+static cairo_status_t cairo_write_func_gstring(void *closure, const unsigned char *data, unsigned int length)
+{
+	GString *str = closure;
+	g_string_append_len(str, (gchar *)data, length);
+	return CAIRO_STATUS_SUCCESS;
+}
+
 // this is exported by the shim bionic linker
 void dl_parse_library_path(const char *path, char *delim);
 
@@ -561,7 +569,9 @@ static void open(GtkApplication *app, GFile **files, gint nfiles, const gchar *h
 			(*env)->ExceptionDescribe(env);
 
 		GVariant *icon_serialized = NULL;
-		if (app_icon_path && !d->install_internal) {
+		if (!d->install_internal) {
+			if (app_icon_path) {
+				/* we can import the icon as-is */
 				extract_from_apk(app_icon_path, app_icon_path);
 				char *app_icon_path_full = g_strdup_printf("%s/%s", app_data_dir, app_icon_path);
 				GMappedFile *icon_file = g_mapped_file_new(app_icon_path_full, FALSE, NULL);
@@ -572,6 +582,27 @@ static void open(GtkApplication *app, GFile **files, gint nfiles, const gchar *h
 				g_bytes_unref(icon_bytes);
 				g_mapped_file_unref(icon_file);
 				g_free(app_icon_path_full);
+			} else {
+				/* the icon is a generalized Drawable, let's render it into an SVG */
+				_SET_STATIC_BOOL_FIELD((*env)->FindClass(env, "android/graphics/drawable/VectorDrawable"), "direct_draw_override", true);
+				GdkPaintable *icon_paintable = _PTR((*env)->CallLongMethod(env, application_object, handle_cache.application.get_app_icon_paintable));
+				GString *svg_string = g_string_new("");
+				cairo_surface_t *svg_surface = cairo_svg_surface_create_for_stream(cairo_write_func_gstring, svg_string, 108, 108);
+				cairo_t *cr = cairo_create(svg_surface);
+				GdkSnapshot *snapshot = gtk_snapshot_new();
+				gdk_paintable_snapshot(icon_paintable, snapshot, 108, 108);
+				GskRenderNode *node = gtk_snapshot_to_node(snapshot);
+				gsk_render_node_draw(node, cr);
+				gsk_render_node_unref(node);
+				g_object_unref(snapshot);
+				cairo_destroy(cr);
+				cairo_surface_destroy(svg_surface);
+				GBytes *icon_bytes = g_string_free_to_bytes(svg_string);
+				GIcon *icon = g_bytes_icon_new(icon_bytes);
+				icon_serialized = g_icon_serialize(icon);
+				g_object_unref(icon);
+				g_bytes_unref(icon_bytes);
+			}
 		}
 
 		gchar *dest_name = g_strdup_printf("%s.apk", package_name);