Merge pull request #68990 from timothyqiu/editor-gradient-preview-plugin

[3.x] Add Gradient resource preview generator

editor/editor_node.cpp

@@ -7065,6 +7065,7 @@ EditorNode::EditorNode() {
 	resource_preview->add_preview_generator(Ref<EditorMeshPreviewPlugin>(memnew(EditorMeshPreviewPlugin)));
 	resource_preview->add_preview_generator(Ref<EditorBitmapPreviewPlugin>(memnew(EditorBitmapPreviewPlugin)));
 	resource_preview->add_preview_generator(Ref<EditorFontPreviewPlugin>(memnew(EditorFontPreviewPlugin)));
+	resource_preview->add_preview_generator(Ref<EditorGradientPreviewPlugin>(memnew(EditorGradientPreviewPlugin)));
 
 	{
 		Ref<SpatialMaterialConversionPlugin> spatial_mat_convert;

editor/editor_resource_picker.cpp

@@ -86,7 +86,7 @@ void EditorResourcePicker::_update_resource_preview(const String &p_path, const
 	if (p_preview.is_valid()) {
 		preview_rect->set_margin(MARGIN_LEFT, assign_button->get_icon()->get_width() + assign_button->get_stylebox("normal")->get_default_margin(MARGIN_LEFT) + get_constant("hseparation", "Button"));
 
-		if (type == "GradientTexture") {
+		if (type == "GradientTexture" || type == "Gradient") {
 			preview_rect->set_stretch_mode(TextureRect::STRETCH_SCALE);
 			assign_button->set_custom_minimum_size(Size2(1, 1));
 		} else {

editor/plugins/editor_preview_plugins.cpp

@@ -931,3 +931,32 @@ EditorFontPreviewPlugin::~EditorFontPreviewPlugin() {
 	VS::get_singleton()->free(canvas);
 	VS::get_singleton()->free(viewport);
 }
+
+///////////////////////////////////////////////////////////////////////////
+
+static const real_t GRADIENT_PREVIEW_TEXTURE_SCALE_FACTOR = 4.0;
+
+bool EditorGradientPreviewPlugin::handles(const String &p_type) const {
+	return ClassDB::is_parent_class(p_type, "Gradient");
+}
+
+bool EditorGradientPreviewPlugin::generate_small_preview_automatically() const {
+	return true;
+}
+
+Ref<Texture> EditorGradientPreviewPlugin::generate(const Ref<Resource> &p_from, const Size2 &p_size) const {
+	Ref<Gradient> gradient = p_from;
+	if (gradient.is_valid()) {
+		Ref<GradientTexture> ptex = Ref<GradientTexture>(memnew(GradientTexture));
+		ptex->set_width(p_size.width * GRADIENT_PREVIEW_TEXTURE_SCALE_FACTOR * EDSCALE);
+		ptex->set_gradient(gradient);
+
+		Ref<ImageTexture> image = Ref<ImageTexture>(memnew(ImageTexture));
+		image->create_from_image(ptex->get_data());
+		return image;
+	}
+	return Ref<Texture>();
+}
+
+EditorGradientPreviewPlugin::EditorGradientPreviewPlugin() {
+}

editor/plugins/editor_preview_plugins.h

@@ -174,4 +174,15 @@ public:
 	~EditorFontPreviewPlugin();
 };
 
+class EditorGradientPreviewPlugin : public EditorResourcePreviewGenerator {
+	GDCLASS(EditorGradientPreviewPlugin, EditorResourcePreviewGenerator);
+
+public:
+	virtual bool handles(const String &p_type) const;
+	virtual bool generate_small_preview_automatically() const;
+	virtual Ref<Texture> generate(const Ref<Resource> &p_from, const Size2 &p_size) const;
+
+	EditorGradientPreviewPlugin();
+};
+
 #endif // EDITOR_PREVIEW_PLUGINS_H