File: editor_resource_preview.cpp

package info (click to toggle)
godot 3.0.6-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 104,964 kB
  • sloc: ansic: 732,795; cpp: 601,776; xml: 56,216; asm: 17,127; lisp: 12,017; python: 9,048; java: 8,253; cs: 5,803; sh: 557; perl: 275; makefile: 98; objc: 17
file content (400 lines) | stat: -rw-r--r-- 12,959 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
/*************************************************************************/
/*  editor_resource_preview.cpp                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 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_resource_preview.h"

#include "editor_scale.h"
#include "editor_settings.h"
#include "io/resource_loader.h"
#include "io/resource_saver.h"
#include "message_queue.h"
#include "os/file_access.h"
#include "project_settings.h"

bool EditorResourcePreviewGenerator::handles(const String &p_type) const {

	if (get_script_instance() && get_script_instance()->has_method("handles")) {
		return get_script_instance()->call("handles", p_type);
	}
	ERR_EXPLAIN("EditorResourcePreviewGenerator::handles needs to be overridden");
	ERR_FAIL_V(false);
}
Ref<Texture> EditorResourcePreviewGenerator::generate(const RES &p_from) {

	if (get_script_instance() && get_script_instance()->has_method("generate")) {
		return get_script_instance()->call("generate", p_from);
	}
	ERR_EXPLAIN("EditorResourcePreviewGenerator::generate needs to be overridden");
	ERR_FAIL_V(Ref<Texture>());
}

Ref<Texture> EditorResourcePreviewGenerator::generate_from_path(const String &p_path) {

	if (get_script_instance() && get_script_instance()->has_method("generate_from_path")) {
		return get_script_instance()->call("generate_from_path", p_path);
	}

	RES res = ResourceLoader::load(p_path);
	if (!res.is_valid())
		return res;
	return generate(res);
}

void EditorResourcePreviewGenerator::_bind_methods() {

	ClassDB::add_virtual_method(get_class_static(), MethodInfo(Variant::BOOL, "handles", PropertyInfo(Variant::STRING, "type")));
	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate", PropertyInfo(Variant::OBJECT, "from", PROPERTY_HINT_RESOURCE_TYPE, "Resource")));
	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate_from_path", PropertyInfo(Variant::STRING, "path", PROPERTY_HINT_FILE)));
}

EditorResourcePreviewGenerator::EditorResourcePreviewGenerator() {
}

EditorResourcePreview *EditorResourcePreview::singleton = NULL;

void EditorResourcePreview::_thread_func(void *ud) {

	EditorResourcePreview *erp = (EditorResourcePreview *)ud;
	erp->_thread();
}

void EditorResourcePreview::_preview_ready(const String &p_str, const Ref<Texture> &p_texture, ObjectID id, const StringName &p_func, const Variant &p_ud) {

	preview_mutex->lock();

	String path = p_str;
	uint32_t hash = 0;
	uint64_t modified_time = 0;

	if (p_str.begins_with("ID:")) {
		hash = p_str.get_slicec(':', 2).to_int();
		path = "ID:" + p_str.get_slicec(':', 1);
	} else {
		modified_time = FileAccess::get_modified_time(path);
	}

	Item item;
	item.order = order++;
	item.preview = p_texture;
	item.last_hash = hash;
	item.modified_time = modified_time;

	cache[path] = item;

	preview_mutex->unlock();

	MessageQueue::get_singleton()->push_call(id, p_func, path, p_texture, p_ud);
}

Ref<Texture> EditorResourcePreview::_generate_preview(const QueueItem &p_item, const String &cache_base) {

	String type;

	if (p_item.resource.is_valid())
		type = p_item.resource->get_class();
	else
		type = ResourceLoader::get_resource_type(p_item.path);

	if (type == "")
		return Ref<Texture>(); //could not guess type

	Ref<Texture> generated;

	for (int i = 0; i < preview_generators.size(); i++) {

		if (!preview_generators[i]->handles(type))
			continue;
		if (p_item.resource.is_valid()) {
			generated = preview_generators[i]->generate(p_item.resource);
		} else {
			generated = preview_generators[i]->generate_from_path(p_item.path);
		}

		break;
	}

	if (!p_item.resource.is_valid()) {
		// cache the preview in case it's a resource on disk
		if (generated.is_valid()) {
			int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
			thumbnail_size *= EDSCALE;
			//wow it generated a preview... save cache
			ResourceSaver::save(cache_base + ".png", generated);
			FileAccess *f = FileAccess::open(cache_base + ".txt", FileAccess::WRITE);
			f->store_line(itos(thumbnail_size));
			f->store_line(itos(FileAccess::get_modified_time(p_item.path)));
			f->store_line(FileAccess::get_md5(p_item.path));
			memdelete(f);
		} else {
			//print_line("was not generated");
		}
	}

	return generated;
}

void EditorResourcePreview::_thread() {

	while (!exit) {

		preview_sem->wait();
		preview_mutex->lock();

		if (queue.size()) {

			QueueItem item = queue.front()->get();
			queue.pop_front();

			if (cache.has(item.path)) {
				//already has it because someone loaded it, just let it know it's ready
				String path = item.path;
				if (item.resource.is_valid()) {
					path += ":" + itos(cache[item.path].last_hash); //keep last hash (see description of what this is in condition below)
				}

				_preview_ready(path, cache[item.path].preview, item.id, item.function, item.userdata);

				preview_mutex->unlock();
			} else {

				preview_mutex->unlock();

				Ref<ImageTexture> texture;

				int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
				thumbnail_size *= EDSCALE;

				if (item.resource.is_valid()) {

					texture = _generate_preview(item, String());
					//adding hash to the end of path (should be ID:<objid>:<hash>) because of 5 argument limit to call_deferred
					_preview_ready(item.path + ":" + itos(item.resource->hash_edited_version()), texture, item.id, item.function, item.userdata);

				} else {

					String temp_path = EditorSettings::get_singleton()->get_cache_dir();
					String cache_base = ProjectSettings::get_singleton()->globalize_path(item.path).md5_text();
					cache_base = temp_path.plus_file("resthumb-" + cache_base);

					//does not have it, try to load a cached thumbnail

					String file = cache_base + ".txt";
					FileAccess *f = FileAccess::open(file, FileAccess::READ);
					if (!f) {

						//generate
						texture = _generate_preview(item, cache_base);
					} else {

						uint64_t modtime = FileAccess::get_modified_time(item.path);
						int tsize = f->get_line().to_int64();
						uint64_t last_modtime = f->get_line().to_int64();

						bool cache_valid = true;

						if (tsize != thumbnail_size) {

							cache_valid = false;
							memdelete(f);
						} else if (last_modtime != modtime) {

							String last_md5 = f->get_line();
							String md5 = FileAccess::get_md5(item.path);
							memdelete(f);

							if (last_md5 != md5) {

								cache_valid = false;

							} else {
								//update modified time

								f = FileAccess::open(file, FileAccess::WRITE);
								f->store_line(itos(modtime));
								f->store_line(md5);
								memdelete(f);
							}
						} else {
							memdelete(f);
						}

						//cache_valid = false;

						if (cache_valid) {

							Ref<Image> img;
							img.instance();

							if (img->load(cache_base + ".png") != OK) {
								cache_valid = false;
							} else {

								texture.instance();
								texture->create_from_image(img, Texture::FLAG_FILTER);
							}
						}

						if (!cache_valid) {

							texture = _generate_preview(item, cache_base);
						}
					}

					_preview_ready(item.path, texture, item.id, item.function, item.userdata);
				}
			}

		} else {
			preview_mutex->unlock();
		}
	}
}

void EditorResourcePreview::queue_edited_resource_preview(const Ref<Resource> &p_res, Object *p_receiver, const StringName &p_receiver_func, const Variant &p_userdata) {

	ERR_FAIL_NULL(p_receiver);
	ERR_FAIL_COND(!p_res.is_valid());

	preview_mutex->lock();

	String path_id = "ID:" + itos(p_res->get_instance_id());

	if (cache.has(path_id) && cache[path_id].last_hash == p_res->hash_edited_version()) {

		cache[path_id].order = order++;
		p_receiver->call_deferred(p_receiver_func, path_id, cache[path_id].preview, p_userdata);
		preview_mutex->unlock();
		return;
	}

	cache.erase(path_id); //erase if exists, since it will be regen

	QueueItem item;
	item.function = p_receiver_func;
	item.id = p_receiver->get_instance_id();
	item.resource = p_res;
	item.path = path_id;
	item.userdata = p_userdata;

	queue.push_back(item);
	preview_mutex->unlock();
	preview_sem->post();
}

void EditorResourcePreview::queue_resource_preview(const String &p_path, Object *p_receiver, const StringName &p_receiver_func, const Variant &p_userdata) {

	ERR_FAIL_NULL(p_receiver);
	preview_mutex->lock();
	if (cache.has(p_path)) {
		cache[p_path].order = order++;
		p_receiver->call_deferred(p_receiver_func, p_path, cache[p_path].preview, p_userdata);
		preview_mutex->unlock();
		return;
	}

	QueueItem item;
	item.function = p_receiver_func;
	item.id = p_receiver->get_instance_id();
	item.path = p_path;
	item.userdata = p_userdata;

	queue.push_back(item);
	preview_mutex->unlock();
	preview_sem->post();
}

void EditorResourcePreview::add_preview_generator(const Ref<EditorResourcePreviewGenerator> &p_generator) {

	preview_generators.push_back(p_generator);
}

void EditorResourcePreview::remove_preview_generator(const Ref<EditorResourcePreviewGenerator> &p_generator) {

	preview_generators.erase(p_generator);
}

EditorResourcePreview *EditorResourcePreview::get_singleton() {

	return singleton;
}

void EditorResourcePreview::_bind_methods() {

	ClassDB::bind_method("_preview_ready", &EditorResourcePreview::_preview_ready);

	ClassDB::bind_method(D_METHOD("queue_resource_preview", "path", "receiver", "receiver_func", "userdata"), &EditorResourcePreview::queue_resource_preview);
	ClassDB::bind_method(D_METHOD("queue_edited_resource_preview", "resource", "receiver", "receiver_func", "userdata"), &EditorResourcePreview::queue_edited_resource_preview);
	ClassDB::bind_method(D_METHOD("add_preview_generator", "generator"), &EditorResourcePreview::add_preview_generator);
	ClassDB::bind_method(D_METHOD("remove_preview_generator", "generator"), &EditorResourcePreview::remove_preview_generator);
	ClassDB::bind_method(D_METHOD("check_for_invalidation", "path"), &EditorResourcePreview::check_for_invalidation);

	ADD_SIGNAL(MethodInfo("preview_invalidated", PropertyInfo(Variant::STRING, "path")));
}

void EditorResourcePreview::check_for_invalidation(const String &p_path) {

	preview_mutex->lock();

	bool call_invalidated = false;
	if (cache.has(p_path)) {

		uint64_t modified_time = FileAccess::get_modified_time(p_path);
		if (modified_time != cache[p_path].modified_time) {
			cache.erase(p_path);
			call_invalidated = true;
		}
	}

	preview_mutex->unlock();

	if (call_invalidated) { //do outside mutex
		call_deferred("emit_signal", "preview_invalidated", p_path);
	}
}

EditorResourcePreview::EditorResourcePreview() {
	singleton = this;
	preview_mutex = Mutex::create();
	preview_sem = Semaphore::create();
	order = 0;
	exit = false;

	thread = Thread::create(_thread_func, this);
}

EditorResourcePreview::~EditorResourcePreview() {

	exit = true;
	preview_sem->post();
	Thread::wait_to_finish(thread);
	memdelete(thread);
	memdelete(preview_mutex);
	memdelete(preview_sem);
}