text: /*************************************************************************/
  /*  editor_preview_plugins.cpp                                           */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "editor_preview_plugins.h"
  
  #include "core/io/file_access_memory.h"
  #include "core/io/resource_loader.h"
  #include "core/os/os.h"
  #include "editor/editor_node.h"
  #include "editor/editor_scale.h"
  #include "editor/editor_settings.h"
  #include "scene/resources/bit_map.h"
  #include "scene/resources/dynamic_font.h"
  #include "scene/resources/material.h"
  #include "scene/resources/mesh.h"
  #include "servers/audio/audio_stream.h"
  
  void post_process_preview(Ref<Image> p_image) {
  
  	if (p_image->get_format() != Image::FORMAT_RGBA8)
  		p_image->convert(Image::FORMAT_RGBA8);
  
  	p_image->lock();
  
  	const int w = p_image->get_width();
  	const int h = p_image->get_height();
  
  	const int r = MIN(w, h) / 32;
  	const int r2 = r * r;
  	Color transparent = Color(0, 0, 0, 0);
  
  	for (int i = 0; i < r; i++) {
  		for (int j = 0; j < r; j++) {
  			int dx = i - r;
  			int dy = j - r;
  			if (dx * dx + dy * dy > r2) {
  				p_image->set_pixel(i, j, transparent);
  				p_image->set_pixel(w - 1 - i, j, transparent);
  				p_image->set_pixel(w - 1 - i, h - 1 - j, transparent);
  				p_image->set_pixel(i, h - 1 - j, transparent);
  			} else {
  				break;
  			}
  		}
  	}
  
  	p_image->unlock();
  }
  
  bool EditorTexturePreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "Texture");
  }
  
  bool EditorTexturePreviewPlugin::generate_small_preview_automatically() const {
  	return true;
  }
  
  Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<Image> img;
  	Ref<AtlasTexture> atex = p_from;
  	Ref<LargeTexture> ltex = p_from;
  	if (atex.is_valid()) {
  		Ref<Texture> tex = atex->get_atlas();
  		if (!tex.is_valid()) {
  			return Ref<Texture>();
  		}
  
  		Ref<Image> atlas = tex->get_data();
  		if (!atlas.is_valid()) {
  			return Ref<Texture>();
  		}
  
  		img = atlas->get_rect(atex->get_region());
  	} else if (ltex.is_valid()) {
  		img = ltex->to_image();
  	} else {
  		Ref<Texture> tex = p_from;
  		if (tex.is_valid()) {
  			img = tex->get_data();
  			if (img.is_valid()) {
  				img = img->duplicate();
  			}
  		}
  	}
  
  	if (img.is_null() || img->empty())
  		return Ref<Texture>();
  
  	img->clear_mipmaps();
  
  	if (img->is_compressed()) {
  		if (img->decompress() != OK)
  			return Ref<Texture>();
  	} else if (img->get_format() != Image::FORMAT_RGB8 && img->get_format() != Image::FORMAT_RGBA8) {
  		img->convert(Image::FORMAT_RGBA8);
  	}
  
  	Vector2 new_size = img->get_size();
  	if (new_size.x > p_size.x) {
  		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
  	}
  	if (new_size.y > p_size.y) {
  		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
  	}
  	Vector2i new_size_i(MAX(1, (int)new_size.x), MAX(1, (int)new_size.y));
  	img->resize(new_size_i.x, new_size_i.y, Image::INTERPOLATE_CUBIC);
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  
  	ptex->create_from_image(img, 0);
  	return ptex;
  }
  
  EditorTexturePreviewPlugin::EditorTexturePreviewPlugin() {
  }
  
  ////////////////////////////////////////////////////////////////////////////
  
  bool EditorImagePreviewPlugin::handles(const String &p_type) const {
  
  	return p_type == "Image";
  }
  
  Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<Image> img = p_from;
  
  	if (img.is_null() || img->empty())
  		return Ref<Image>();
  
  	img = img->duplicate();
  	img->clear_mipmaps();
  
  	if (img->is_compressed()) {
  		if (img->decompress() != OK)
  			return Ref<Image>();
  	} else if (img->get_format() != Image::FORMAT_RGB8 && img->get_format() != Image::FORMAT_RGBA8) {
  		img->convert(Image::FORMAT_RGBA8);
  	}
  
  	Vector2 new_size = img->get_size();
  	if (new_size.x > p_size.x) {
  		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
  	}
  	if (new_size.y > p_size.y) {
  		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
  	}
  	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex;
  	ptex.instance();
  
  	ptex->create_from_image(img, 0);
  	return ptex;
  }
  
  EditorImagePreviewPlugin::EditorImagePreviewPlugin() {
  }
  
  bool EditorImagePreviewPlugin::generate_small_preview_automatically() const {
  	return true;
  }
  ////////////////////////////////////////////////////////////////////////////
  /////////////////////////////////////////////////
  bool EditorBitmapPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "BitMap");
  }
  
  Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<BitMap> bm = p_from;
  
  	if (bm->get_size() == Size2()) {
  		return Ref<Texture>();
  	}
  
  	PoolVector<uint8_t> data;
  
  	data.resize(bm->get_size().width * bm->get_size().height);
  
  	{
  		PoolVector<uint8_t>::Write w = data.write();
  
  		for (int i = 0; i < bm->get_size().width; i++) {
  			for (int j = 0; j < bm->get_size().height; j++) {
  				if (bm->get_bit(Point2i(i, j))) {
  					w[j * bm->get_size().width + i] = 255;
  				} else {
  					w[j * bm->get_size().width + i] = 0;
  				}
  			}
  		}
  	}
  
  	Ref<Image> img;
  	img.instance();
  	img->create(bm->get_size().width, bm->get_size().height, 0, Image::FORMAT_L8, data);
  
  	if (img->is_compressed()) {
  		if (img->decompress() != OK)
  			return Ref<Texture>();
  	} else if (img->get_format() != Image::FORMAT_RGB8 && img->get_format() != Image::FORMAT_RGBA8) {
  		img->convert(Image::FORMAT_RGBA8);
  	}
  
  	Vector2 new_size = img->get_size();
  	if (new_size.x > p_size.x) {
  		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
  	}
  	if (new_size.y > p_size.y) {
  		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
  	}
  	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  
  	ptex->create_from_image(img, 0);
  	return ptex;
  }
  
  bool EditorBitmapPreviewPlugin::generate_small_preview_automatically() const {
  	return true;
  }
  
  EditorBitmapPreviewPlugin::EditorBitmapPreviewPlugin() {
  }
  
  ///////////////////////////////////////////////////////////////////////////
  
  bool EditorPackedScenePreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "PackedScene");
  }
  Ref<Texture> EditorPackedScenePreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	return generate_from_path(p_from->get_path(), p_size);
  }
  
  Ref<Texture> EditorPackedScenePreviewPlugin::generate_from_path(const String &p_path, const Size2 &p_size) const {
  
  	String temp_path = EditorSettings::get_singleton()->get_cache_dir();
  	String cache_base = ProjectSettings::get_singleton()->globalize_path(p_path).md5_text();
  	cache_base = temp_path.plus_file("resthumb-" + cache_base);
  
  	//does not have it, try to load a cached thumbnail
  
  	String path = cache_base + ".png";
  
  	if (!FileAccess::exists(path))
  		return Ref<Texture>();
  
  	Ref<Image> img;
  	img.instance();
  	Error err = img->load(path);
  	if (err == OK) {
  
  		Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  
  		post_process_preview(img);
  		ptex->create_from_image(img, 0);
  		return ptex;
  
  	} else {
  		return Ref<Texture>();
  	}
  }
  
  EditorPackedScenePreviewPlugin::EditorPackedScenePreviewPlugin() {
  }
  
  //////////////////////////////////////////////////////////////////
  
  void EditorMaterialPreviewPlugin::_preview_done(const Variant &p_udata) {
  
  	preview_done = true;
  }
  
  void EditorMaterialPreviewPlugin::_bind_methods() {
  
  	ClassDB::bind_method("_preview_done", &EditorMaterialPreviewPlugin::_preview_done);
  }
  
  bool EditorMaterialPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "Material"); //any material
  }
  
  bool EditorMaterialPreviewPlugin::generate_small_preview_automatically() const {
  	return true;
  }
  
  Ref<Texture> EditorMaterialPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<Material> material = p_from;
  	ERR_FAIL_COND_V(material.is_null(), Ref<Texture>());
  
  	if (material->get_shader_mode() == Shader::MODE_SPATIAL) {
  
  		VS::get_singleton()->mesh_surface_set_material(sphere, 0, material->get_rid());
  
  		VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_ONCE); //once used for capture
  
  		preview_done = false;
  		VS::get_singleton()->request_frame_drawn_callback(const_cast<EditorMaterialPreviewPlugin *>(this), "_preview_done", Variant());
  
  		while (!preview_done) {
  			OS::get_singleton()->delay_usec(10);
  		}
  
  		Ref<Image> img = VS::get_singleton()->texture_get_data(viewport_texture);
  		VS::get_singleton()->mesh_surface_set_material(sphere, 0, RID());
  
  		ERR_FAIL_COND_V(!img.is_valid(), Ref<ImageTexture>());
  
  		img->convert(Image::FORMAT_RGBA8);
  		int thumbnail_size = MAX(p_size.x, p_size.y);
  		img->resize(thumbnail_size, thumbnail_size, Image::INTERPOLATE_CUBIC);
  		post_process_preview(img);
  		Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  		ptex->create_from_image(img, 0);
  		return ptex;
  	}
  
  	return Ref<Texture>();
  }
  
  EditorMaterialPreviewPlugin::EditorMaterialPreviewPlugin() {
  
  	scenario = VS::get_singleton()->scenario_create();
  
  	viewport = VS::get_singleton()->viewport_create();
  	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_DISABLED);
  	VS::get_singleton()->viewport_set_scenario(viewport, scenario);
  	VS::get_singleton()->viewport_set_size(viewport, 128, 128);
  	VS::get_singleton()->viewport_set_transparent_background(viewport, true);
  	VS::get_singleton()->viewport_set_active(viewport, true);
  	VS::get_singleton()->viewport_set_vflip(viewport, true);
  	viewport_texture = VS::get_singleton()->viewport_get_texture(viewport);
  
  	camera = VS::get_singleton()->camera_create();
  	VS::get_singleton()->viewport_attach_camera(viewport, camera);
  	VS::get_singleton()->camera_set_transform(camera, Transform(Basis(), Vector3(0, 0, 3)));
  	VS::get_singleton()->camera_set_perspective(camera, 45, 0.1, 10);
  
  	light = VS::get_singleton()->directional_light_create();
  	light_instance = VS::get_singleton()->instance_create2(light, scenario);
  	VS::get_singleton()->instance_set_transform(light_instance, Transform().looking_at(Vector3(-1, -1, -1), Vector3(0, 1, 0)));
  
  	light2 = VS::get_singleton()->directional_light_create();
  	VS::get_singleton()->light_set_color(light2, Color(0.7, 0.7, 0.7));
  	//VS::get_singleton()->light_set_color(light2, Color(0.7, 0.7, 0.7));
  
  	light_instance2 = VS::get_singleton()->instance_create2(light2, scenario);
  
  	VS::get_singleton()->instance_set_transform(light_instance2, Transform().looking_at(Vector3(0, 1, 0), Vector3(0, 0, 1)));
  
  	sphere = VS::get_singleton()->mesh_create();
  	sphere_instance = VS::get_singleton()->instance_create2(sphere, scenario);
  
  	int lats = 32;
  	int lons = 32;
  	float radius = 1.0;
  
  	PoolVector<Vector3> vertices;
  	PoolVector<Vector3> normals;
  	PoolVector<Vector2> uvs;
  	PoolVector<float> tangents;
  	Basis tt = Basis(Vector3(0, 1, 0), Math_PI * 0.5);
  
  	for (int i = 1; i <= lats; i++) {
  		double lat0 = Math_PI * (-0.5 + (double)(i - 1) / lats);
  		double z0 = Math::sin(lat0);
  		double zr0 = Math::cos(lat0);
  
  		double lat1 = Math_PI * (-0.5 + (double)i / lats);
  		double z1 = Math::sin(lat1);
  		double zr1 = Math::cos(lat1);
  
  		for (int j = lons; j >= 1; j--) {
  
  			double lng0 = 2 * Math_PI * (double)(j - 1) / lons;
  			double x0 = Math::cos(lng0);
  			double y0 = Math::sin(lng0);
  
  			double lng1 = 2 * Math_PI * (double)(j) / lons;
  			double x1 = Math::cos(lng1);
  			double y1 = Math::sin(lng1);
  
  			Vector3 v[4] = {
  				Vector3(x1 * zr0, z0, y1 * zr0),
  				Vector3(x1 * zr1, z1, y1 * zr1),
  				Vector3(x0 * zr1, z1, y0 * zr1),
  				Vector3(x0 * zr0, z0, y0 * zr0)
  			};
  
  #define ADD_POINT(m_idx)                                                                       \
  	normals.push_back(v[m_idx]);                                                               \
  	vertices.push_back(v[m_idx] * radius);                                                     \
  	{                                                                                          \
  		Vector2 uv(Math::atan2(v[m_idx].x, v[m_idx].z), Math::atan2(-v[m_idx].y, v[m_idx].z)); \
  		uv /= Math_PI;                                                                         \
  		uv *= 4.0;                                                                             \
  		uv = uv * 0.5 + Vector2(0.5, 0.5);                                                     \
  		uvs.push_back(uv);                                                                     \
  	}                                                                                          \
  	{                                                                                          \
  		Vector3 t = tt.xform(v[m_idx]);                                                        \
  		tangents.push_back(t.x);                                                               \
  		tangents.push_back(t.y);                                                               \
  		tangents.push_back(t.z);                                                               \
  		tangents.push_back(1.0);                                                               \
  	}
  
  			ADD_POINT(0);
  			ADD_POINT(1);
  			ADD_POINT(2);
  
  			ADD_POINT(2);
  			ADD_POINT(3);
  			ADD_POINT(0);
  		}
  	}
  
  	Array arr;
  	arr.resize(VS::ARRAY_MAX);
  	arr[VS::ARRAY_VERTEX] = vertices;
  	arr[VS::ARRAY_NORMAL] = normals;
  	arr[VS::ARRAY_TANGENT] = tangents;
  	arr[VS::ARRAY_TEX_UV] = uvs;
  	VS::get_singleton()->mesh_add_surface_from_arrays(sphere, VS::PRIMITIVE_TRIANGLES, arr);
  }
  
  EditorMaterialPreviewPlugin::~EditorMaterialPreviewPlugin() {
  
  	VS::get_singleton()->free(sphere);
  	VS::get_singleton()->free(sphere_instance);
  	VS::get_singleton()->free(viewport);
  	VS::get_singleton()->free(light);
  	VS::get_singleton()->free(light_instance);
  	VS::get_singleton()->free(light2);
  	VS::get_singleton()->free(light_instance2);
  	VS::get_singleton()->free(camera);
  	VS::get_singleton()->free(scenario);
  }
  
  ///////////////////////////////////////////////////////////////////////////
  
  static bool _is_text_char(CharType c) {
  
  	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_';
  }
  
  bool EditorScriptPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "Script");
  }
  
  Ref<Texture> EditorScriptPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<Script> scr = p_from;
  	if (scr.is_null())
  		return Ref<Texture>();
  
  	String code = scr->get_source_code().strip_edges();
  	if (code == "")
  		return Ref<Texture>();
  
  	List<String> kwors;
  	scr->get_language()->get_reserved_words(&kwors);
  
  	Set<String> keywords;
  
  	for (List<String>::Element *E = kwors.front(); E; E = E->next()) {
  
  		keywords.insert(E->get());
  	}
  
  	int line = 0;
  	int col = 0;
  	Ref<Image> img;
  	img.instance();
  	int thumbnail_size = MAX(p_size.x, p_size.y);
  	img->create(thumbnail_size, thumbnail_size, 0, Image::FORMAT_RGBA8);
  
  	Color bg_color = EditorSettings::get_singleton()->get("text_editor/highlighting/background_color");
  	Color keyword_color = EditorSettings::get_singleton()->get("text_editor/highlighting/keyword_color");
  	Color text_color = EditorSettings::get_singleton()->get("text_editor/highlighting/text_color");
  	Color symbol_color = EditorSettings::get_singleton()->get("text_editor/highlighting/symbol_color");
  
  	img->lock();
  
  	if (bg_color.a == 0)
  		bg_color = Color(0, 0, 0, 0);
  	bg_color.a = MAX(bg_color.a, 0.2); // some background
  
  	for (int i = 0; i < thumbnail_size; i++) {
  		for (int j = 0; j < thumbnail_size; j++) {
  			img->set_pixel(i, j, bg_color);
  		}
  	}
  
  	const int x0 = thumbnail_size / 8;
  	const int y0 = thumbnail_size / 8;
  	const int available_height = thumbnail_size - 2 * y0;
  	col = x0;
  
  	bool prev_is_text = false;
  	bool in_keyword = false;
  	for (int i = 0; i < code.length(); i++) {
  
  		CharType c = code[i];
  		if (c > 32) {
  			if (col < thumbnail_size) {
  				Color color = text_color;
  
  				if (c != '_' && ((c >= '!' && c <= '/') || (c >= ':' && c <= '@') || (c >= '[' && c <= '`') || (c >= '{' && c <= '~') || c == '\t')) {
  					//make symbol a little visible
  					color = symbol_color;
  					in_keyword = false;
  				} else if (!prev_is_text && _is_text_char(c)) {
  					int pos = i;
  
  					while (_is_text_char(code[pos])) {
  						pos++;
  					}
  					String word = code.substr(i, pos - i);
  					if (keywords.has(word))
  						in_keyword = true;
  
  				} else if (!_is_text_char(c)) {
  					in_keyword = false;
  				}
  
  				if (in_keyword)
  					color = keyword_color;
  
  				Color ul = color;
  				ul.a *= 0.5;
  				img->set_pixel(col, y0 + line * 2, bg_color.blend(ul));
  				img->set_pixel(col, y0 + line * 2 + 1, color);
  
  				prev_is_text = _is_text_char(c);
  			}
  		} else {
  
  			prev_is_text = false;
  			in_keyword = false;
  
  			if (c == '\n') {
  				col = x0;
  				line++;
  				if (line >= available_height / 2)
  					break;
  			} else if (c == '\t') {
  				col += 3;
  			}
  		}
  		col++;
  	}
  
  	img->unlock();
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  
  	ptex->create_from_image(img, 0);
  	return ptex;
  }
  
  EditorScriptPreviewPlugin::EditorScriptPreviewPlugin() {
  }
  ///////////////////////////////////////////////////////////////////
  
  bool EditorAudioStreamPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "AudioStream");
  }
  
  Ref<Texture> EditorAudioStreamPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<AudioStream> stream = p_from;
  	ERR_FAIL_COND_V(stream.is_null(), Ref<Texture>());
  
  	PoolVector<uint8_t> img;
  
  	int w = p_size.x;
  	int h = p_size.y;
  	img.resize(w * h * 3);
  
  	PoolVector<uint8_t>::Write imgdata = img.write();
  	uint8_t *imgw = imgdata.ptr();
  
  	Ref<AudioStreamPlayback> playback = stream->instance_playback();
  	ERR_FAIL_COND_V(playback.is_null(), Ref<Texture>());
  
  	float len_s = stream->get_length();
  	if (len_s == 0) {
  		len_s = 60; //one minute audio if no length specified
  	}
  	int frame_length = AudioServer::get_singleton()->get_mix_rate() * len_s;
  
  	Vector<AudioFrame> frames;
  	frames.resize(frame_length);
  
  	playback->start();
  	playback->mix(frames.ptrw(), 1, frames.size());
  	playback->stop();
  
  	for (int i = 0; i < w; i++) {
  
  		float max = -1000;
  		float min = 1000;
  		int from = uint64_t(i) * frame_length / w;
  		int to = (uint64_t(i) + 1) * frame_length / w;
  		to = MIN(to, frame_length);
  		from = MIN(from, frame_length - 1);
  		if (to == from) {
  			to = from + 1;
  		}
  
  		for (int j = from; j < to; j++) {
  
  			max = MAX(max, frames[j].l);
  			max = MAX(max, frames[j].r);
  
  			min = MIN(min, frames[j].l);
  			min = MIN(min, frames[j].r);
  		}
  
  		int pfrom = CLAMP((min * 0.5 + 0.5) * h / 2, 0, h / 2) + h / 4;
  		int pto = CLAMP((max * 0.5 + 0.5) * h / 2, 0, h / 2) + h / 4;
  
  		for (int j = 0; j < h; j++) {
  			uint8_t *p = &imgw[(j * w + i) * 3];
  			if (j < pfrom || j > pto) {
  				p[0] = 100;
  				p[1] = 100;
  				p[2] = 100;
  			} else {
  				p[0] = 180;
  				p[1] = 180;
  				p[2] = 180;
  			}
  		}
  	}
  
  	imgdata.release();
  	//post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  	Ref<Image> image;
  	image.instance();
  	image->create(w, h, false, Image::FORMAT_RGB8, img);
  	ptex->create_from_image(image, 0);
  	return ptex;
  }
  
  EditorAudioStreamPreviewPlugin::EditorAudioStreamPreviewPlugin() {
  }
  
  ///////////////////////////////////////////////////////////////////////////
  
  void EditorMeshPreviewPlugin::_preview_done(const Variant &p_udata) {
  
  	preview_done = true;
  }
  
  void EditorMeshPreviewPlugin::_bind_methods() {
  
  	ClassDB::bind_method("_preview_done", &EditorMeshPreviewPlugin::_preview_done);
  }
  bool EditorMeshPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "Mesh"); //any Mesh
  }
  
  Ref<Texture> EditorMeshPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	Ref<Mesh> mesh = p_from;
  	ERR_FAIL_COND_V(mesh.is_null(), Ref<Texture>());
  
  	VS::get_singleton()->instance_set_base(mesh_instance, mesh->get_rid());
  
  	AABB aabb = mesh->get_aabb();
  	Vector3 ofs = aabb.position + aabb.size * 0.5;
  	aabb.position -= ofs;
  	Transform xform;
  	xform.basis = Basis().rotated(Vector3(0, 1, 0), -Math_PI * 0.125);
  	xform.basis = Basis().rotated(Vector3(1, 0, 0), Math_PI * 0.125) * xform.basis;
  	AABB rot_aabb = xform.xform(aabb);
  	float m = MAX(rot_aabb.size.x, rot_aabb.size.y) * 0.5;
  	if (m == 0)
  		return Ref<Texture>();
  	m = 1.0 / m;
  	m *= 0.5;
  	xform.basis.scale(Vector3(m, m, m));
  	xform.origin = -xform.basis.xform(ofs); //-ofs*m;
  	xform.origin.z -= rot_aabb.size.z * 2;
  	VS::get_singleton()->instance_set_transform(mesh_instance, xform);
  
  	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_ONCE); //once used for capture
  
  	preview_done = false;
  	VS::get_singleton()->request_frame_drawn_callback(const_cast<EditorMeshPreviewPlugin *>(this), "_preview_done", Variant());
  
  	while (!preview_done) {
  		OS::get_singleton()->delay_usec(10);
  	}
  
  	Ref<Image> img = VS::get_singleton()->texture_get_data(viewport_texture);
  	ERR_FAIL_COND_V(img.is_null(), Ref<ImageTexture>());
  
  	VS::get_singleton()->instance_set_base(mesh_instance, RID());
  
  	img->convert(Image::FORMAT_RGBA8);
  
  	Vector2 new_size = img->get_size();
  	if (new_size.x > p_size.x) {
  		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
  	}
  	if (new_size.y > p_size.y) {
  		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
  	}
  	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  	ptex->create_from_image(img, 0);
  	return ptex;
  }
  
  EditorMeshPreviewPlugin::EditorMeshPreviewPlugin() {
  
  	scenario = VS::get_singleton()->scenario_create();
  
  	viewport = VS::get_singleton()->viewport_create();
  	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_DISABLED);
  	VS::get_singleton()->viewport_set_vflip(viewport, true);
  	VS::get_singleton()->viewport_set_scenario(viewport, scenario);
  	VS::get_singleton()->viewport_set_size(viewport, 128, 128);
  	VS::get_singleton()->viewport_set_transparent_background(viewport, true);
  	VS::get_singleton()->viewport_set_active(viewport, true);
  	viewport_texture = VS::get_singleton()->viewport_get_texture(viewport);
  
  	camera = VS::get_singleton()->camera_create();
  	VS::get_singleton()->viewport_attach_camera(viewport, camera);
  	VS::get_singleton()->camera_set_transform(camera, Transform(Basis(), Vector3(0, 0, 3)));
  	//VS::get_singleton()->camera_set_perspective(camera,45,0.1,10);
  	VS::get_singleton()->camera_set_orthogonal(camera, 1.0, 0.01, 1000.0);
  
  	light = VS::get_singleton()->directional_light_create();
  	light_instance = VS::get_singleton()->instance_create2(light, scenario);
  	VS::get_singleton()->instance_set_transform(light_instance, Transform().looking_at(Vector3(-1, -1, -1), Vector3(0, 1, 0)));
  
  	light2 = VS::get_singleton()->directional_light_create();
  	VS::get_singleton()->light_set_color(light2, Color(0.7, 0.7, 0.7));
  	//VS::get_singleton()->light_set_color(light2, VS::LIGHT_COLOR_SPECULAR, Color(0.0, 0.0, 0.0));
  	light_instance2 = VS::get_singleton()->instance_create2(light2, scenario);
  
  	VS::get_singleton()->instance_set_transform(light_instance2, Transform().looking_at(Vector3(0, 1, 0), Vector3(0, 0, 1)));
  
  	//sphere = VS::get_singleton()->mesh_create();
  	mesh_instance = VS::get_singleton()->instance_create();
  	VS::get_singleton()->instance_set_scenario(mesh_instance, scenario);
  }
  
  EditorMeshPreviewPlugin::~EditorMeshPreviewPlugin() {
  
  	//VS::get_singleton()->free(sphere);
  	VS::get_singleton()->free(mesh_instance);
  	VS::get_singleton()->free(viewport);
  	VS::get_singleton()->free(light);
  	VS::get_singleton()->free(light_instance);
  	VS::get_singleton()->free(light2);
  	VS::get_singleton()->free(light_instance2);
  	VS::get_singleton()->free(camera);
  	VS::get_singleton()->free(scenario);
  }
  
  ///////////////////////////////////////////////////////////////////////////
  
  void EditorFontPreviewPlugin::_preview_done(const Variant &p_udata) {
  
  	preview_done = true;
  }
  
  void EditorFontPreviewPlugin::_bind_methods() {
  
  	ClassDB::bind_method("_preview_done", &EditorFontPreviewPlugin::_preview_done);
  }
  
  bool EditorFontPreviewPlugin::handles(const String &p_type) const {
  
  	return ClassDB::is_parent_class(p_type, "DynamicFontData") || ClassDB::is_parent_class(p_type, "DynamicFont");
  }
  
  Ref<Texture> EditorFontPreviewPlugin::generate_from_path(const String &p_path, const Size2 &p_size) const {
  
  	RES res = ResourceLoader::load(p_path);
  	Ref<DynamicFont> sampled_font;
  	if (res->is_class("DynamicFont")) {
  		sampled_font = res->duplicate();
  		if (sampled_font->get_outline_color() == Color(1, 1, 1, 1)) {
  			sampled_font->set_outline_color(Color(0, 0, 0, 1));
  		}
  	} else if (res->is_class("DynamicFontData")) {
  		sampled_font.instance();
  		sampled_font->set_font_data(res);
  	}
  	sampled_font->set_size(50);
  
  	String sampled_text = "Abg";
  	Vector2 size = sampled_font->get_string_size(sampled_text);
  
  	Vector2 pos;
  
  	pos.x = 64 - size.x / 2;
  	pos.y = 80;
  
  	Ref<Font> font = sampled_font;
  
  	font->draw(canvas_item, pos, sampled_text);
  
  	preview_done = false;
  	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_ONCE); //once used for capture
  	VS::get_singleton()->request_frame_drawn_callback(const_cast<EditorFontPreviewPlugin *>(this), "_preview_done", Variant());
  
  	while (!preview_done) {
  		OS::get_singleton()->delay_usec(10);
  	}
  
  	VS::get_singleton()->canvas_item_clear(canvas_item);
  
  	Ref<Image> img = VS::get_singleton()->texture_get_data(viewport_texture);
  	ERR_FAIL_COND_V(img.is_null(), Ref<ImageTexture>());
  
  	img->convert(Image::FORMAT_RGBA8);
  
  	Vector2 new_size = img->get_size();
  	if (new_size.x > p_size.x) {
  		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
  	}
  	if (new_size.y > p_size.y) {
  		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
  	}
  	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
  
  	post_process_preview(img);
  
  	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
  	ptex->create_from_image(img, 0);
  
  	return ptex;
  }
  
  Ref<Texture> EditorFontPreviewPlugin::generate(const RES &p_from, const Size2 &p_size) const {
  
  	String path = p_from->get_path();
  	if (!FileAccess::exists(path)) {
  		return Ref<Texture>();
  	}
  	return generate_from_path(path, p_size);
  }
  
  EditorFontPreviewPlugin::EditorFontPreviewPlugin() {
  
  	viewport = VS::get_singleton()->viewport_create();
  	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_DISABLED);
  	VS::get_singleton()->viewport_set_vflip(viewport, true);
  	VS::get_singleton()->viewport_set_size(viewport, 128, 128);
  	VS::get_singleton()->viewport_set_active(viewport, true);
  	viewport_texture = VS::get_singleton()->viewport_get_texture(viewport);
  
  	canvas = VS::get_singleton()->canvas_create();
  	canvas_item = VS::get_singleton()->canvas_item_create();
  
  	VS::get_singleton()->viewport_attach_canvas(viewport, canvas);
  	VS::get_singleton()->canvas_item_set_parent(canvas_item, canvas);
  }
  
  EditorFontPreviewPlugin::~EditorFontPreviewPlugin() {
  
  	VS::get_singleton()->free(canvas_item);
  	VS::get_singleton()->free(canvas);
  	VS::get_singleton()->free(viewport);
  }
  