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      1 /*
      2  * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "CSSFontFaceSource.h"
     28 
     29 #include "CachedFont.h"
     30 #include "CSSFontFace.h"
     31 #include "CSSFontSelector.h"
     32 #include "CachedResourceLoader.h"
     33 #include "FontCache.h"
     34 #include "FontDescription.h"
     35 #include "GlyphPageTreeNode.h"
     36 #include "SimpleFontData.h"
     37 
     38 #if ENABLE(SVG_FONTS)
     39 #include "FontCustomPlatformData.h"
     40 #include "SVGFontData.h"
     41 #include "SVGFontElement.h"
     42 #include "SVGFontFaceElement.h"
     43 #include "SVGNames.h"
     44 #include "SVGURIReference.h"
     45 #endif
     46 
     47 namespace WebCore {
     48 
     49 CSSFontFaceSource::CSSFontFaceSource(const String& str, CachedFont* font)
     50     : m_string(str)
     51     , m_font(font)
     52     , m_face(0)
     53 #if ENABLE(SVG_FONTS)
     54     , m_hasExternalSVGFont(false)
     55 #endif
     56 {
     57     if (m_font)
     58         m_font->addClient(this);
     59 }
     60 
     61 CSSFontFaceSource::~CSSFontFaceSource()
     62 {
     63     if (m_font)
     64         m_font->removeClient(this);
     65     pruneTable();
     66 }
     67 
     68 void CSSFontFaceSource::pruneTable()
     69 {
     70     if (m_fontDataTable.isEmpty())
     71         return;
     72 
     73     HashMap<unsigned, SimpleFontData*>::iterator end = m_fontDataTable.end();
     74     for (HashMap<unsigned, SimpleFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)
     75         m_face->retireCustomFont(it->second);
     76 
     77     m_fontDataTable.clear();
     78 }
     79 
     80 bool CSSFontFaceSource::isLoaded() const
     81 {
     82     if (m_font)
     83         return m_font->isLoaded();
     84     return true;
     85 }
     86 
     87 bool CSSFontFaceSource::isValid() const
     88 {
     89     if (m_font)
     90         return !m_font->errorOccurred();
     91     return true;
     92 }
     93 
     94 void CSSFontFaceSource::fontLoaded(CachedFont*)
     95 {
     96     pruneTable();
     97     if (m_face)
     98         m_face->fontLoaded(this);
     99 }
    100 
    101 SimpleFontData* CSSFontFaceSource::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, CSSFontSelector* fontSelector)
    102 {
    103     // If the font hasn't loaded or an error occurred, then we've got nothing.
    104     if (!isValid())
    105         return 0;
    106 
    107 #if ENABLE(SVG_FONTS)
    108     if (!m_font && !m_svgFontFaceElement) {
    109 #else
    110     if (!m_font) {
    111 #endif
    112         SimpleFontData* fontData = fontCache()->getCachedFontData(fontDescription, m_string);
    113 
    114         // We're local. Just return a SimpleFontData from the normal cache.
    115         return fontData;
    116     }
    117 
    118     // See if we have a mapping in our FontData cache.
    119     unsigned hashKey = (fontDescription.computedPixelSize() + 1) << 6 | fontDescription.widthVariant() << 4
    120                        | (fontDescription.textOrientation() == TextOrientationUpright ? 8 : 0) | (fontDescription.orientation() == Vertical ? 4 : 0) | (syntheticBold ? 2 : 0) | (syntheticItalic ? 1 : 0);
    121     if (SimpleFontData* cachedData = m_fontDataTable.get(hashKey))
    122         return cachedData;
    123 
    124     OwnPtr<SimpleFontData> fontData;
    125 
    126     // If we are still loading, then we let the system pick a font.
    127     if (isLoaded()) {
    128         if (m_font) {
    129 #if ENABLE(SVG_FONTS)
    130             if (m_hasExternalSVGFont) {
    131                 // For SVG fonts parse the external SVG document, and extract the <font> element.
    132                 if (!m_font->ensureSVGFontData())
    133                     return 0;
    134 
    135                 if (!m_externalSVGFontElement)
    136                     m_externalSVGFontElement = m_font->getSVGFontById(SVGURIReference::getTarget(m_string));
    137 
    138                 if (!m_externalSVGFontElement)
    139                     return 0;
    140 
    141                 SVGFontFaceElement* fontFaceElement = 0;
    142 
    143                 // Select first <font-face> child
    144                 for (Node* fontChild = m_externalSVGFontElement->firstChild(); fontChild; fontChild = fontChild->nextSibling()) {
    145                     if (fontChild->hasTagName(SVGNames::font_faceTag)) {
    146                         fontFaceElement = static_cast<SVGFontFaceElement*>(fontChild);
    147                         break;
    148                     }
    149                 }
    150 
    151                 if (fontFaceElement) {
    152                     if (!m_svgFontFaceElement) {
    153                         // We're created using a CSS @font-face rule, that means we're not associated with a SVGFontFaceElement.
    154                         // Use the imported <font-face> tag as referencing font-face element for these cases.
    155                         m_svgFontFaceElement = fontFaceElement;
    156                     }
    157 
    158                     fontData.set(new SimpleFontData(adoptPtr(new SVGFontData(fontFaceElement)), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic));
    159                 }
    160             } else
    161 #endif
    162             {
    163                 // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.
    164                 if (!m_font->ensureCustomFontData())
    165                     return 0;
    166 
    167                 fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.orientation(),
    168                                                                                    fontDescription.textOrientation(), fontDescription.widthVariant(), fontDescription.renderingMode()), true, false));
    169             }
    170         } else {
    171 #if ENABLE(SVG_FONTS)
    172             // In-Document SVG Fonts
    173             if (m_svgFontFaceElement)
    174                 fontData.set(new SimpleFontData(adoptPtr(new SVGFontData(m_svgFontFaceElement.get())), fontDescription.computedPixelSize(), syntheticBold, syntheticItalic));
    175 #endif
    176         }
    177     } else {
    178         // Kick off the load now.
    179         if (CachedResourceLoader* cachedResourceLoader = fontSelector->cachedResourceLoader())
    180             m_font->beginLoadIfNeeded(cachedResourceLoader);
    181         // FIXME: m_string is a URL so it makes no sense to pass it as a family name.
    182         SimpleFontData* tempData = fontCache()->getCachedFontData(fontDescription, m_string);
    183         if (!tempData)
    184             tempData = fontCache()->getLastResortFallbackFont(fontDescription);
    185 
    186         fontData.set(new SimpleFontData(tempData->platformData(), true, true));
    187     }
    188 
    189     SimpleFontData* fontDataRawPtr = fontData.leakPtr();
    190     m_fontDataTable.set(hashKey, fontDataRawPtr);
    191 
    192     return fontDataRawPtr;
    193 }
    194 
    195 #if ENABLE(SVG_FONTS)
    196 SVGFontFaceElement* CSSFontFaceSource::svgFontFaceElement() const
    197 {
    198     return m_svgFontFaceElement.get();
    199 }
    200 
    201 void CSSFontFaceSource::setSVGFontFaceElement(PassRefPtr<SVGFontFaceElement> element)
    202 {
    203     m_svgFontFaceElement = element;
    204 }
    205 
    206 bool CSSFontFaceSource::isSVGFontFaceSource() const
    207 {
    208     return m_svgFontFaceElement || m_hasExternalSVGFont;
    209 }
    210 #endif
    211 
    212 }
    213