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/*
* Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_LIST_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_LIST_H_
#include "base/memory/weak_ptr.h"
#include "third_party/blink/renderer/platform/fonts/fallback_list_composite_key.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_selector.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_cache.h"
#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
namespace blink {
class FontDescription;
class FontFallbackMap;
const int kCAllFamiliesScanned = -1;
// FontFallbackList caches FontData from FontSelector and FontCache. If font
// updates occur (e.g., @font-face rule changes, web font is loaded, etc.),
// the cached data becomes stale and hence, invalid.
class PLATFORM_EXPORT FontFallbackList : public RefCounted<FontFallbackList> {
USING_FAST_MALLOC(FontFallbackList);
public:
static scoped_refptr<FontFallbackList> Create(
FontFallbackMap& font_fallback_map) {
return base::AdoptRef(new FontFallbackList(font_fallback_map));
}
~FontFallbackList();
// Returns whether the cached data is valid. We can use a FontFallbackList
// only when it's valid.
bool IsValid() const { return !is_invalid_; }
// Called when font updates (see class comment) have made the cached data
// invalid. Once marked, a Font object cannot reuse |this|, but have to work
// on a new instance obtained from FontFallbackMap.
void MarkInvalid() {
is_invalid_ = true;
}
bool ShouldSkipDrawing() const;
// Returns false only after the WeakPersistent to FontFallbackMap is turned to
// nullptr due to GC.
bool HasFontFallbackMap() const { return font_fallback_map_; }
FontFallbackMap& GetFontFallbackMap() const { return *font_fallback_map_; }
FontSelector* GetFontSelector() const;
uint16_t Generation() const { return generation_; }
ShapeCache* GetShapeCache(const FontDescription& font_description) {
if (!shape_cache_) {
FallbackListCompositeKey key = CompositeKey(font_description);
shape_cache_ =
FontCache::GetFontCache()->GetShapeCache(key)->GetWeakPtr();
}
DCHECK(shape_cache_);
if (GetFontSelector())
shape_cache_->ClearIfVersionChanged(GetFontSelector()->Version());
return shape_cache_.get();
}
const SimpleFontData* PrimarySimpleFontData(
const FontDescription& font_description) {
if (!cached_primary_simple_font_data_) {
cached_primary_simple_font_data_ =
DeterminePrimarySimpleFontData(font_description);
DCHECK(cached_primary_simple_font_data_);
}
return cached_primary_simple_font_data_;
}
const FontData* FontDataAt(const FontDescription&, unsigned index);
bool CanShapeWordByWord(const FontDescription&);
void SetCanShapeWordByWordForTesting(bool b) {
can_shape_word_by_word_ = b;
can_shape_word_by_word_computed_ = true;
}
bool HasLoadingFallback() const { return has_loading_fallback_; }
bool HasCustomFont() const { return has_custom_font_; }
bool HasAdvanceOverride() const { return has_advance_override_; }
private:
explicit FontFallbackList(FontFallbackMap& font_fallback_map);
scoped_refptr<FontData> GetFontData(const FontDescription&);
const SimpleFontData* DeterminePrimarySimpleFontData(const FontDescription&);
FallbackListCompositeKey CompositeKey(const FontDescription&) const;
void ReleaseFontData();
bool ComputeCanShapeWordByWord(const FontDescription&);
Vector<scoped_refptr<FontData>, 1> font_list_;
const SimpleFontData* cached_primary_simple_font_data_;
const WeakPersistent<FontFallbackMap> font_fallback_map_;
int family_index_;
uint16_t generation_;
bool has_loading_fallback_ : 1;
bool has_custom_font_ : 1;
bool has_advance_override_ : 1;
bool can_shape_word_by_word_ : 1;
bool can_shape_word_by_word_computed_ : 1;
bool is_invalid_ : 1;
base::WeakPtr<ShapeCache> shape_cache_;
DISALLOW_COPY_AND_ASSIGN(FontFallbackList);
};
} // namespace blink
#endif
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