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      1 /*
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      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
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      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
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     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "UniscribeHelperTextRun.h"
     33 
     34 #include "ChromiumBridge.h"
     35 #include "Font.h"
     36 #include "SimpleFontData.h"
     37 
     38 namespace WebCore {
     39 
     40 UniscribeHelperTextRun::UniscribeHelperTextRun(const TextRun& run,
     41                                                const Font& font)
     42     : UniscribeHelper(run.characters(), run.length(), run.rtl(),
     43                       font.primaryFont()->platformData().hfont(),
     44                       font.primaryFont()->platformData().scriptCache(),
     45                       font.primaryFont()->platformData().scriptFontProperties())
     46     , m_font(&font)
     47     , m_fontIndex(0)
     48 {
     49     setDirectionalOverride(run.directionalOverride());
     50     setLetterSpacing(font.letterSpacing());
     51     setSpaceWidth(font.spaceWidth());
     52     setWordSpacing(font.wordSpacing());
     53     setAscent(font.primaryFont()->ascent());
     54 
     55     init();
     56 
     57     // Padding is the amount to add to make justification happen. This
     58     // should be done after Init() so all the runs are already measured.
     59     if (run.padding() > 0)
     60         justify(run.padding());
     61 }
     62 
     63 UniscribeHelperTextRun::UniscribeHelperTextRun(
     64     const wchar_t* input,
     65     int inputLength,
     66     bool isRtl,
     67     HFONT hfont,
     68     SCRIPT_CACHE* scriptCache,
     69     SCRIPT_FONTPROPERTIES* fontProperties)
     70     : UniscribeHelper(input, inputLength, isRtl, hfont,
     71                       scriptCache, fontProperties)
     72     , m_font(0)
     73     , m_fontIndex(-1)
     74 {
     75 }
     76 
     77 void UniscribeHelperTextRun::tryToPreloadFont(HFONT font)
     78 {
     79     // Ask the browser to get the font metrics for this font.
     80     // That will preload the font and it should now be accessible
     81     // from the renderer.
     82     ChromiumBridge::ensureFontLoaded(font);
     83 }
     84 
     85 bool UniscribeHelperTextRun::nextWinFontData(
     86     HFONT* hfont,
     87     SCRIPT_CACHE** scriptCache,
     88     SCRIPT_FONTPROPERTIES** fontProperties,
     89     int* ascent)
     90 {
     91     // This check is necessary because NextWinFontData can be called again
     92     // after we already ran out of fonts. fontDataAt behaves in a strange
     93     // manner when the difference between param passed and # of fonts stored in
     94     // WebKit::Font is larger than one. We can avoid this check by setting
     95     // font_index_ to # of elements in hfonts_ when we run out of font. In that
     96     // case, we'd have to go through a couple of more checks before returning
     97     // false.
     98     if (m_fontIndex == -1 || !m_font)
     99         return false;
    100 
    101     // If the font data for a fallback font requested is not yet retrieved, add
    102     // them to our vectors. Note that '>' rather than '>=' is used to test that
    103     // condition. primaryFont is not stored in hfonts_, and friends so that
    104     // indices for fontDataAt and our vectors for font data are 1 off from each
    105     // other.  That is, when fully populated, hfonts_ and friends have one font
    106     // fewer than what's contained in font_.
    107     if (static_cast<size_t>(++m_fontIndex) > m_hfonts.size()) {
    108         const FontData *fontData = m_font->fontDataAt(m_fontIndex);
    109         if (!fontData) {
    110             // Ran out of fonts.
    111             m_fontIndex = -1;
    112             return false;
    113         }
    114 
    115         // FIXME: this won't work for SegmentedFontData
    116         // http://crbug.com/6425
    117         const SimpleFontData* simpleFontData =
    118             fontData->fontDataForCharacter(' ');
    119 
    120         m_hfonts.append(simpleFontData->platformData().hfont());
    121         m_scriptCaches.append(simpleFontData->platformData().scriptCache());
    122         m_fontProperties.append(simpleFontData->platformData().scriptFontProperties());
    123         m_ascents.append(simpleFontData->ascent());
    124     }
    125 
    126     *hfont = m_hfonts[m_fontIndex - 1];
    127     *scriptCache = m_scriptCaches[m_fontIndex - 1];
    128     *fontProperties = m_fontProperties[m_fontIndex - 1];
    129     *ascent = m_ascents[m_fontIndex - 1];
    130     return true;
    131 }
    132 
    133 void UniscribeHelperTextRun::resetFontIndex()
    134 {
    135     m_fontIndex = 0;
    136 }
    137 
    138 }  // namespace WebCore
    139