The Tor Browser / file comparison

comparison: layout/style/nsLayoutStylesheetCache.cpp

layout/style/nsLayoutStylesheetCache.cpp

changeset 2
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1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "nsLayoutStylesheetCache.h"
8
9 #include "nsAppDirectoryServiceDefs.h"
10 #include "mozilla/MemoryReporting.h"
11 #include "mozilla/Preferences.h"
12 #include "mozilla/css/Loader.h"
13 #include "nsIFile.h"
14 #include "nsNetUtil.h"
15 #include "nsIObserverService.h"
16 #include "nsServiceManagerUtils.h"
17 #include "nsIXULRuntime.h"
18 #include "nsCSSStyleSheet.h"
19
20 using namespace mozilla;
21
22 static bool sNumberControlEnabled;
23
24 #define NUMBER_CONTROL_PREF "dom.forms.number"
25
26 NS_IMPL_ISUPPORTS(
27 nsLayoutStylesheetCache, nsIObserver, nsIMemoryReporter)
28
29 nsresult
30 nsLayoutStylesheetCache::Observe(nsISupports* aSubject,
31 const char* aTopic,
32 const char16_t* aData)
33 {
34 if (!strcmp(aTopic, "profile-before-change")) {
35 mUserContentSheet = nullptr;
36 mUserChromeSheet = nullptr;
37 }
38 else if (!strcmp(aTopic, "profile-do-change")) {
39 InitFromProfile();
40 }
41 else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||
42 strcmp(aTopic, "chrome-flush-caches") == 0) {
43 mScrollbarsSheet = nullptr;
44 mFormsSheet = nullptr;
45 mNumberControlSheet = nullptr;
46 }
47 else {
48 NS_NOTREACHED("Unexpected observer topic.");
49 }
50 return NS_OK;
51 }
52
53 nsCSSStyleSheet*
54 nsLayoutStylesheetCache::ScrollbarsSheet()
55 {
56 EnsureGlobal();
57 if (!gStyleCache)
58 return nullptr;
59
60 if (!gStyleCache->mScrollbarsSheet) {
61 nsCOMPtr<nsIURI> sheetURI;
62 NS_NewURI(getter_AddRefs(sheetURI),
63 NS_LITERAL_CSTRING("chrome://global/skin/scrollbars.css"));
64
65 // Scrollbars don't need access to unsafe rules
66 if (sheetURI)
67 LoadSheet(sheetURI, gStyleCache->mScrollbarsSheet, false);
68 NS_ASSERTION(gStyleCache->mScrollbarsSheet, "Could not load scrollbars.css.");
69 }
70
71 return gStyleCache->mScrollbarsSheet;
72 }
73
74 nsCSSStyleSheet*
75 nsLayoutStylesheetCache::FormsSheet()
76 {
77 EnsureGlobal();
78 if (!gStyleCache)
79 return nullptr;
80
81 if (!gStyleCache->mFormsSheet) {
82 nsCOMPtr<nsIURI> sheetURI;
83 NS_NewURI(getter_AddRefs(sheetURI),
84 NS_LITERAL_CSTRING("resource://gre-resources/forms.css"));
85
86 // forms.css needs access to unsafe rules
87 if (sheetURI)
88 LoadSheet(sheetURI, gStyleCache->mFormsSheet, true);
89
90 NS_ASSERTION(gStyleCache->mFormsSheet, "Could not load forms.css.");
91 }
92
93 return gStyleCache->mFormsSheet;
94 }
95
96 nsCSSStyleSheet*
97 nsLayoutStylesheetCache::NumberControlSheet()
98 {
99 EnsureGlobal();
100 if (!gStyleCache)
101 return nullptr;
102
103 if (!sNumberControlEnabled) {
104 return nullptr;
105 }
106
107 if (!gStyleCache->mNumberControlSheet) {
108 nsCOMPtr<nsIURI> sheetURI;
109 NS_NewURI(getter_AddRefs(sheetURI),
110 NS_LITERAL_CSTRING("resource://gre-resources/number-control.css"));
111
112 if (sheetURI)
113 LoadSheet(sheetURI, gStyleCache->mNumberControlSheet, false);
114
115 NS_ASSERTION(gStyleCache->mNumberControlSheet, "Could not load number-control.css");
116 }
117
118 return gStyleCache->mNumberControlSheet;
119 }
120
121 nsCSSStyleSheet*
122 nsLayoutStylesheetCache::UserContentSheet()
123 {
124 EnsureGlobal();
125 if (!gStyleCache)
126 return nullptr;
127
128 return gStyleCache->mUserContentSheet;
129 }
130
131 nsCSSStyleSheet*
132 nsLayoutStylesheetCache::UserChromeSheet()
133 {
134 EnsureGlobal();
135 if (!gStyleCache)
136 return nullptr;
137
138 return gStyleCache->mUserChromeSheet;
139 }
140
141 nsCSSStyleSheet*
142 nsLayoutStylesheetCache::UASheet()
143 {
144 EnsureGlobal();
145 if (!gStyleCache)
146 return nullptr;
147
148 return gStyleCache->mUASheet;
149 }
150
151 nsCSSStyleSheet*
152 nsLayoutStylesheetCache::QuirkSheet()
153 {
154 EnsureGlobal();
155 if (!gStyleCache)
156 return nullptr;
157
158 return gStyleCache->mQuirkSheet;
159 }
160
161 nsCSSStyleSheet*
162 nsLayoutStylesheetCache::FullScreenOverrideSheet()
163 {
164 EnsureGlobal();
165 if (!gStyleCache)
166 return nullptr;
167
168 return gStyleCache->mFullScreenOverrideSheet;
169 }
170
171 void
172 nsLayoutStylesheetCache::Shutdown()
173 {
174 NS_IF_RELEASE(gCSSLoader);
175 NS_IF_RELEASE(gStyleCache);
176 }
177
178 MOZ_DEFINE_MALLOC_SIZE_OF(LayoutStylesheetCacheMallocSizeOf)
179
180 NS_IMETHODIMP
181 nsLayoutStylesheetCache::CollectReports(nsIHandleReportCallback* aHandleReport,
182 nsISupports* aData)
183 {
184 return MOZ_COLLECT_REPORT(
185 "explicit/layout/style-sheet-cache", KIND_HEAP, UNITS_BYTES,
186 SizeOfIncludingThis(LayoutStylesheetCacheMallocSizeOf),
187 "Memory used for some built-in style sheets.");
188 }
189
190
191 size_t
192 nsLayoutStylesheetCache::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
193 {
194 size_t n = aMallocSizeOf(this);
195
196 #define MEASURE(s) n += s ? s->SizeOfIncludingThis(aMallocSizeOf) : 0;
197
198 MEASURE(mScrollbarsSheet);
199 MEASURE(mFormsSheet);
200 MEASURE(mNumberControlSheet);
201 MEASURE(mUserContentSheet);
202 MEASURE(mUserChromeSheet);
203 MEASURE(mUASheet);
204 MEASURE(mQuirkSheet);
205 MEASURE(mFullScreenOverrideSheet);
206
207 // Measurement of the following members may be added later if DMD finds it is
208 // worthwhile:
209 // - gCSSLoader
210
211 return n;
212 }
213
214 nsLayoutStylesheetCache::nsLayoutStylesheetCache()
215 {
216 nsCOMPtr<nsIObserverService> obsSvc =
217 mozilla::services::GetObserverService();
218 NS_ASSERTION(obsSvc, "No global observer service?");
219
220 if (obsSvc) {
221 obsSvc->AddObserver(this, "profile-before-change", false);
222 obsSvc->AddObserver(this, "profile-do-change", false);
223 obsSvc->AddObserver(this, "chrome-flush-skin-caches", false);
224 obsSvc->AddObserver(this, "chrome-flush-caches", false);
225 }
226
227 InitFromProfile();
228
229 // And make sure that we load our UA sheets. No need to do this
230 // per-profile, since they're profile-invariant.
231 nsCOMPtr<nsIURI> uri;
232 NS_NewURI(getter_AddRefs(uri), "resource://gre-resources/ua.css");
233 if (uri) {
234 LoadSheet(uri, mUASheet, true);
235 }
236 NS_ASSERTION(mUASheet, "Could not load ua.css");
237
238 NS_NewURI(getter_AddRefs(uri), "resource://gre-resources/quirk.css");
239 if (uri) {
240 LoadSheet(uri, mQuirkSheet, true);
241 }
242 NS_ASSERTION(mQuirkSheet, "Could not load quirk.css");
243
244 NS_NewURI(getter_AddRefs(uri), "resource://gre-resources/full-screen-override.css");
245 if (uri) {
246 LoadSheet(uri, mFullScreenOverrideSheet, true);
247 }
248 NS_ASSERTION(mFullScreenOverrideSheet, "Could not load full-screen-override.css");
249 }
250
251 nsLayoutStylesheetCache::~nsLayoutStylesheetCache()
252 {
253 mozilla::UnregisterWeakMemoryReporter(this);
254 gStyleCache = nullptr;
255 }
256
257 void
258 nsLayoutStylesheetCache::InitMemoryReporter()
259 {
260 mozilla::RegisterWeakMemoryReporter(this);
261 }
262
263 void
264 nsLayoutStylesheetCache::EnsureGlobal()
265 {
266 if (gStyleCache) return;
267
268 gStyleCache = new nsLayoutStylesheetCache();
269 if (!gStyleCache) return;
270
271 NS_ADDREF(gStyleCache);
272
273 gStyleCache->InitMemoryReporter();
274
275 Preferences::AddBoolVarCache(&sNumberControlEnabled, NUMBER_CONTROL_PREF,
276 true);
277 }
278
279 void
280 nsLayoutStylesheetCache::InitFromProfile()
281 {
282 nsCOMPtr<nsIXULRuntime> appInfo = do_GetService("@mozilla.org/xre/app-info;1");
283 if (appInfo) {
284 bool inSafeMode = false;
285 appInfo->GetInSafeMode(&inSafeMode);
286 if (inSafeMode)
287 return;
288 }
289 nsCOMPtr<nsIFile> contentFile;
290 nsCOMPtr<nsIFile> chromeFile;
291
292 NS_GetSpecialDirectory(NS_APP_USER_CHROME_DIR,
293 getter_AddRefs(contentFile));
294 if (!contentFile) {
295 // if we don't have a profile yet, that's OK!
296 return;
297 }
298
299 contentFile->Clone(getter_AddRefs(chromeFile));
300 if (!chromeFile) return;
301
302 contentFile->Append(NS_LITERAL_STRING("userContent.css"));
303 chromeFile->Append(NS_LITERAL_STRING("userChrome.css"));
304
305 LoadSheetFile(contentFile, mUserContentSheet);
306 LoadSheetFile(chromeFile, mUserChromeSheet);
307 }
308
309 void
310 nsLayoutStylesheetCache::LoadSheetFile(nsIFile* aFile, nsRefPtr<nsCSSStyleSheet> &aSheet)
311 {
312 bool exists = false;
313 aFile->Exists(&exists);
314
315 if (!exists) return;
316
317 nsCOMPtr<nsIURI> uri;
318 NS_NewFileURI(getter_AddRefs(uri), aFile);
319
320 LoadSheet(uri, aSheet, false);
321 }
322
323 void
324 nsLayoutStylesheetCache::LoadSheet(nsIURI* aURI,
325 nsRefPtr<nsCSSStyleSheet> &aSheet,
326 bool aEnableUnsafeRules)
327 {
328 if (!aURI) {
329 NS_ERROR("Null URI. Out of memory?");
330 return;
331 }
332
333 if (!gCSSLoader) {
334 gCSSLoader = new mozilla::css::Loader();
335 NS_IF_ADDREF(gCSSLoader);
336 }
337
338 if (gCSSLoader) {
339 gCSSLoader->LoadSheetSync(aURI, aEnableUnsafeRules, true,
340 getter_AddRefs(aSheet));
341 }
342 }
343
344 nsLayoutStylesheetCache*
345 nsLayoutStylesheetCache::gStyleCache = nullptr;
346
347 mozilla::css::Loader*
348 nsLayoutStylesheetCache::gCSSLoader = nullptr;

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