Merge pull request #60395 from Geometror/editor-gradient-preview-plugin

editor/editor_node.cpp

@@ -7086,6 +7086,7 @@ 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<StandardMaterial3DConversionPlugin> spatial_mat_convert;

editor/editor_resource_picker.cpp

@@ -90,7 +90,8 @@ void EditorResourcePicker::_update_resource_preview(const String &p_path, const
 	if (p_preview.is_valid()) {
 		preview_rect->set_offset(SIDE_LEFT, assign_button->get_icon()->get_width() + assign_button->get_theme_stylebox(SNAME("normal"))->get_default_margin(SIDE_LEFT) + get_theme_constant(SNAME("h_separation"), SNAME("Button")));
 
-		if (Ref<GradientTexture1D>(edited_resource).is_valid()) {
+		// Resource-specific stretching.
+		if (Ref<GradientTexture1D>(edited_resource).is_valid() || Ref<Gradient>(edited_resource).is_valid()) {
 			preview_rect->set_stretch_mode(TextureRect::STRETCH_SCALE);
 			assign_button->set_custom_minimum_size(Size2(1, 1));
 		} else {

editor/plugins/editor_preview_plugins.cpp

@@ -904,3 +904,34 @@ EditorFontPreviewPlugin::~EditorFontPreviewPlugin() {
 	RS::get_singleton()->free(canvas);
 	RS::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<Texture2D> EditorGradientPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
+	Ref<Gradient> gradient = p_from;
+	if (gradient.is_valid()) {
+		Ref<GradientTexture1D> ptex;
+		ptex.instantiate();
+		ptex->set_width(p_size.width * GRADIENT_PREVIEW_TEXTURE_SCALE_FACTOR * EDSCALE);
+		ptex->set_gradient(gradient);
+
+		Ref<ImageTexture> itex;
+		itex.instantiate();
+		itex->create_from_image(ptex->get_image());
+		return itex;
+	}
+	return Ref<Texture2D>();
+}
+
+EditorGradientPreviewPlugin::EditorGradientPreviewPlugin() {
+}

editor/plugins/editor_preview_plugins.h

@@ -182,4 +182,15 @@ public:
 	EditorTileMapPatternPreviewPlugin();
 	~EditorTileMapPatternPreviewPlugin();
 };
+
+class EditorGradientPreviewPlugin : public EditorResourcePreviewGenerator {
+	GDCLASS(EditorGradientPreviewPlugin, EditorResourcePreviewGenerator);
+
+public:
+	virtual bool handles(const String &p_type) const override;
+	virtual bool generate_small_preview_automatically() const override;
+	virtual Ref<Texture2D> generate(const RES &p_from, const Size2 &p_size) const override;
+
+	EditorGradientPreviewPlugin();
+};
 #endif // EDITORPREVIEWPLUGINS_H