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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "config.h"
      6 #include "core/css/FontLoader.h"
      7 
      8 #include "core/css/CSSFontSelector.h"
      9 #include "core/fetch/FontResource.h"
     10 #include "core/fetch/ResourceFetcher.h"
     11 
     12 namespace blink {
     13 
     14 FontLoader::FontLoader(CSSFontSelector* fontSelector, ResourceFetcher* resourceFetcher)
     15     : m_beginLoadingTimer(this, &FontLoader::beginLoadTimerFired)
     16     , m_fontSelector(fontSelector)
     17     , m_resourceFetcher(resourceFetcher)
     18 {
     19 }
     20 
     21 FontLoader::~FontLoader()
     22 {
     23 #if ENABLE(OILPAN)
     24     if (!m_resourceFetcher) {
     25         ASSERT(m_fontsToBeginLoading.isEmpty());
     26         return;
     27     }
     28     m_beginLoadingTimer.stop();
     29     // This will decrement the request counts on the ResourceFetcher for all the
     30     // fonts that were pending at the time the FontLoader dies.
     31     clearPendingFonts();
     32 #endif
     33 }
     34 
     35 void FontLoader::addFontToBeginLoading(FontResource* fontResource)
     36 {
     37     if (!m_resourceFetcher || !fontResource->stillNeedsLoad() || fontResource->loadScheduled())
     38         return;
     39 
     40     m_fontsToBeginLoading.append(
     41         std::make_pair(fontResource, ResourceLoader::RequestCountTracker(m_resourceFetcher, fontResource)));
     42     fontResource->didScheduleLoad();
     43     if (!m_beginLoadingTimer.isActive())
     44         m_beginLoadingTimer.startOneShot(0, FROM_HERE);
     45 }
     46 
     47 void FontLoader::beginLoadTimerFired(Timer<blink::FontLoader>*)
     48 {
     49     loadPendingFonts();
     50 }
     51 
     52 void FontLoader::loadPendingFonts()
     53 {
     54     ASSERT(m_resourceFetcher);
     55 
     56     FontsToLoadVector fontsToBeginLoading;
     57     fontsToBeginLoading.swap(m_fontsToBeginLoading);
     58     for (FontsToLoadVector::iterator it = fontsToBeginLoading.begin(); it != fontsToBeginLoading.end(); ++it) {
     59         FontResource* fontResource = it->first.get();
     60         fontResource->beginLoadIfNeeded(m_resourceFetcher);
     61     }
     62 
     63     // When the local fontsToBeginLoading vector goes out of scope it will
     64     // decrement the request counts on the ResourceFetcher for all the fonts
     65     // that were just loaded.
     66 }
     67 
     68 void FontLoader::fontFaceInvalidated()
     69 {
     70     if (m_fontSelector)
     71         m_fontSelector->fontFaceInvalidated();
     72 }
     73 
     74 #if !ENABLE(OILPAN)
     75 void FontLoader::clearResourceFetcherAndFontSelector()
     76 {
     77     if (!m_resourceFetcher) {
     78         ASSERT(m_fontsToBeginLoading.isEmpty());
     79         return;
     80     }
     81 
     82     m_beginLoadingTimer.stop();
     83     clearPendingFonts();
     84     m_resourceFetcher = nullptr;
     85     m_fontSelector = nullptr;
     86 }
     87 #endif
     88 
     89 void FontLoader::clearPendingFonts()
     90 {
     91     for (FontsToLoadVector::iterator it = m_fontsToBeginLoading.begin(); it != m_fontsToBeginLoading.end(); ++it)
     92         it->first->didUnscheduleLoad();
     93     m_fontsToBeginLoading.clear();
     94 }
     95 
     96 void FontLoader::trace(Visitor* visitor)
     97 {
     98     visitor->trace(m_resourceFetcher);
     99     visitor->trace(m_fontSelector);
    100 }
    101 
    102 } // namespace blink
    103