1 /*

     2  * Copyright (C) 2007, 2008 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 "DocLoader.h"

    33 #include "FontCache.h"

    34 #include "FontDescription.h"

    35 #include "GlyphPageTreeNode.h"

    36 #include "SimpleFontData.h"

    37 

    38 #if ENABLE(SVG_FONTS)

    39 #if !PLATFORM(WX)

    40 #include "FontCustomPlatformData.h"

    41 #endif

    42 #include "HTMLNames.h"

    43 #include "SVGFontData.h"

    44 #include "SVGFontElement.h"

    45 #include "SVGFontFaceElement.h"

    46 #include "SVGURIReference.h"

    47 #endif

    48 

    49 namespace WebCore {

    50 

    51 CSSFontFaceSource::CSSFontFaceSource(const String& str, CachedFont* font)

    52     : m_string(str)

    53     , m_font(font)

    54     , m_face(0)

    55 #if ENABLE(SVG_FONTS)

    56     , m_svgFontFaceElement(0)

    57 #endif

    58 {

    59     if (m_font)

    60         m_font->addClient(this);

    61 }

    62 

    63 CSSFontFaceSource::~CSSFontFaceSource()

    64 {

    65     if (m_font)

    66         m_font->removeClient(this);

    67     pruneTable();

    68 }

    69 

    70 void CSSFontFaceSource::pruneTable()

    71 {

    72     if (m_fontDataTable.isEmpty())

    73         return;

    74     HashMap<unsigned, SimpleFontData*>::iterator end = m_fontDataTable.end();

    75     for (HashMap<unsigned, SimpleFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)

    76         GlyphPageTreeNode::pruneTreeCustomFontData(it->second);

    77     deleteAllValues(m_fontDataTable);

    78     m_fontDataTable.clear();

    79 }

    80 

    81 bool CSSFontFaceSource::isLoaded() const

    82 {

    83     if (m_font)

    84         return m_font->isLoaded();

    85     return true;

    86 }

    87 

    88 bool CSSFontFaceSource::isValid() const

    89 {

    90     if (m_font)

    91         return !m_font->errorOccurred();

    92     return true;

    93 }

    94 

    95 void CSSFontFaceSource::fontLoaded(CachedFont*)

    96 {

    97     pruneTable();

    98     if (m_face)

    99         m_face->fontLoaded(this);

   100 }

   101 

   102 SimpleFontData* CSSFontFaceSource::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, CSSFontSelector* fontSelector)

   103 {

   104     // If the font hasn't loaded or an error occurred, then we've got nothing.

   105     if (!isValid())

   106         return 0;

   107 

   108 #if ENABLE(SVG_FONTS)

   109     if (!m_font && !m_svgFontFaceElement) {

   110 #else

   111     if (!m_font) {

   112 #endif

   113         SimpleFontData* fontData = fontCache()->getCachedFontData(fontDescription, m_string);

   114 

   115         // We're local. Just return a SimpleFontData from the normal cache.

   116         return fontData;

   117     }

   118 

   119     // See if we have a mapping in our FontData cache.

   120     unsigned hashKey = fontDescription.computedPixelSize() << 2 | (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_font->isSVGFont()) {

   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                     SVGFontData* svgFontData = new SVGFontData(fontFaceElement);

   159                     fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.renderingMode()), true, false, svgFontData));

   160                 }

   161             } else

   162 #endif

   163             {

   164                 // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.

   165                 if (!m_font->ensureCustomFontData())

   166                     return 0;

   167 

   168                 fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.renderingMode()), true, false));

   169             }

   170         } else {

   171 #if ENABLE(SVG_FONTS)

   172             // In-Document SVG Fonts

   173             if (m_svgFontFaceElement) {

   174                 SVGFontData* svgFontData = new SVGFontData(m_svgFontFaceElement);

   175                 fontData.set(new SimpleFontData(FontPlatformData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic), true, false, svgFontData));

   176             }

   177 #endif

   178         }

   179     } else {

   180         // Kick off the load now.

   181         if (DocLoader* docLoader = fontSelector->docLoader())

   182             m_font->beginLoadIfNeeded(docLoader);

   183         // FIXME: m_string is a URL so it makes no sense to pass it as a family name.

   184         SimpleFontData* tempData = fontCache()->getCachedFontData(fontDescription, m_string);

   185         if (!tempData)

   186             tempData = fontCache()->getLastResortFallbackFont(fontDescription);

   187 

   188         fontData.set(new SimpleFontData(tempData->platformData(), true, true));

   189     }

   190 

   191     SimpleFontData* fontDataRawPtr = fontData.leakPtr();

   192     m_fontDataTable.set(hashKey, fontDataRawPtr);

   193 

   194     return fontDataRawPtr;

   195 }

   196 

   197 }