| /* |
| * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "platform/fonts/FontFallbackList.h" |
| |
| #include "FontFamilyNames.h" |
| #include "platform/fonts/FontCache.h" |
| #include "platform/fonts/FontDescription.h" |
| #include "platform/fonts/FontFamily.h" |
| #include "platform/fonts/SegmentedFontData.h" |
| |
| namespace WebCore { |
| |
| FontFallbackList::FontFallbackList() |
| : m_pageZero(0) |
| , m_cachedPrimarySimpleFontData(0) |
| , m_fontSelector(0) |
| , m_fontSelectorVersion(0) |
| , m_familyIndex(0) |
| , m_generation(FontCache::fontCache()->generation()) |
| , m_pitch(UnknownPitch) |
| , m_loadingCustomFonts(false) |
| { |
| } |
| |
| void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector) |
| { |
| releaseFontData(); |
| m_fontList.clear(); |
| m_pageZero = 0; |
| m_pages.clear(); |
| m_cachedPrimarySimpleFontData = 0; |
| m_familyIndex = 0; |
| m_pitch = UnknownPitch; |
| m_loadingCustomFonts = false; |
| m_fontSelector = fontSelector; |
| m_fontSelectorVersion = m_fontSelector ? m_fontSelector->version() : 0; |
| m_generation = FontCache::fontCache()->generation(); |
| m_widthCache.clear(); |
| } |
| |
| void FontFallbackList::releaseFontData() |
| { |
| unsigned numFonts = m_fontList.size(); |
| for (unsigned i = 0; i < numFonts; ++i) { |
| if (!m_fontList[i]->isCustomFont()) { |
| ASSERT(!m_fontList[i]->isSegmented()); |
| FontCache::fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].get())); |
| } |
| } |
| } |
| |
| void FontFallbackList::determinePitch(const FontDescription& fontDescription) const |
| { |
| const FontData* fontData = primaryFontData(fontDescription); |
| if (!fontData->isSegmented()) |
| m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch(); |
| else { |
| const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData); |
| unsigned numRanges = segmentedFontData->numRanges(); |
| if (numRanges == 1 && segmentedFontData->rangeAt(0).isEntireRange()) |
| m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch(); |
| else |
| m_pitch = VariablePitch; |
| } |
| } |
| |
| bool FontFallbackList::loadingCustomFonts() const |
| { |
| if (m_loadingCustomFonts) |
| return true; |
| |
| unsigned numFonts = m_fontList.size(); |
| for (unsigned i = 0; i < numFonts; ++i) { |
| if (m_fontList[i]->isCustomFont() && m_fontList[i]->isLoading()) { |
| m_loadingCustomFonts = true; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| const FontData* FontFallbackList::primaryFontData(const FontDescription& fontDescription) const |
| { |
| for (unsigned fontIndex = 0; ; ++fontIndex) { |
| const FontData* fontData = fontDataAt(fontDescription, fontIndex); |
| if (!fontData) { |
| // All fonts are custom fonts and are loading. Return the first FontData. |
| // FIXME: Correct fallback to the default font. |
| return fontDataAt(fontDescription, 0); |
| } |
| |
| // When a custom font is loading, we should use the correct fallback font to layout the text. |
| // Here skip the temporary font for the loading custom font which may not act as the correct fallback font. |
| if (!fontData->isLoadingFallback()) |
| return fontData; |
| |
| // Begin to load the first custom font if needed. |
| if (!fontIndex) { |
| const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(' '); |
| if (simpleFontData && simpleFontData->customFontData()) |
| simpleFontData->customFontData()->beginLoadIfNeeded(); |
| } |
| } |
| } |
| |
| PassRefPtr<FontData> FontFallbackList::getFontData(const FontDescription& fontDescription, int& familyIndex) const |
| { |
| RefPtr<FontData> result; |
| |
| int startIndex = familyIndex; |
| const FontFamily* startFamily = &fontDescription.family(); |
| for (int i = 0; startFamily && i < startIndex; i++) |
| startFamily = startFamily->next(); |
| const FontFamily* currFamily = startFamily; |
| while (currFamily && !result) { |
| familyIndex++; |
| if (currFamily->family().length()) { |
| if (m_fontSelector) |
| result = m_fontSelector->getFontData(fontDescription, currFamily->family()); |
| |
| if (!result) |
| result = FontCache::fontCache()->getFontData(fontDescription, currFamily->family()); |
| } |
| currFamily = currFamily->next(); |
| } |
| |
| if (!currFamily) |
| familyIndex = cAllFamiliesScanned; |
| |
| if (result || startIndex) |
| return result.release(); |
| |
| // If it's the primary font that we couldn't find, we try the following. In all other cases, we will |
| // just use per-character system fallback. |
| |
| if (m_fontSelector) { |
| // Try the user's preferred standard font. |
| if (RefPtr<FontData> data = m_fontSelector->getFontData(fontDescription, FontFamilyNames::webkit_standard)) |
| return data.release(); |
| } |
| |
| // Still no result. Hand back our last resort fallback font. |
| return FontCache::fontCache()->getLastResortFallbackFont(fontDescription); |
| } |
| |
| |
| const FontData* FontFallbackList::fontDataAt(const FontDescription& fontDescription, unsigned realizedFontIndex) const |
| { |
| if (realizedFontIndex < m_fontList.size()) |
| return m_fontList[realizedFontIndex].get(); // This fallback font is already in our list. |
| |
| // Make sure we're not passing in some crazy value here. |
| ASSERT(realizedFontIndex == m_fontList.size()); |
| |
| if (m_familyIndex == cAllFamiliesScanned) |
| return 0; |
| |
| // Ask the font cache for the font data. |
| // We are obtaining this font for the first time. We keep track of the families we've looked at before |
| // in |m_familyIndex|, so that we never scan the same spot in the list twice. getFontData will adjust our |
| // |m_familyIndex| as it scans for the right font to make. |
| ASSERT(FontCache::fontCache()->generation() == m_generation); |
| RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex); |
| if (result) { |
| m_fontList.append(result); |
| if (result->isLoading()) |
| m_loadingCustomFonts = true; |
| } |
| return result.get(); |
| } |
| |
| void FontFallbackList::setPlatformFont(const FontPlatformData& platformData) |
| { |
| m_familyIndex = cAllFamiliesScanned; |
| RefPtr<FontData> fontData = FontCache::fontCache()->fontDataFromFontPlatformData(&platformData); |
| m_fontList.append(fontData); |
| } |
| |
| } |