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      1 /*
      2  * Copyright (C) 2010 Google 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 are
      6  * met:
      7  *
      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
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     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
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     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 "WebFontImpl.h"
     33 
     34 #include <skia/ext/platform_canvas.h>
     35 #include "WebFontDescription.h"
     36 #include "WebTextRun.h"
     37 #include "platform/fonts/FontCache.h"
     38 #include "platform/fonts/FontDescription.h"
     39 #include "platform/graphics/GraphicsContext.h"
     40 #include "platform/text/TextRun.h"
     41 #include "public/platform/WebFloatPoint.h"
     42 #include "public/platform/WebFloatRect.h"
     43 #include "public/platform/WebRect.h"
     44 
     45 using namespace WebCore;
     46 
     47 namespace blink {
     48 
     49 WebFont* WebFont::create(const WebFontDescription& desc)
     50 {
     51     return new WebFontImpl(desc, desc.letterSpacing, desc.wordSpacing);
     52 }
     53 
     54 WebFontImpl::WebFontImpl(const FontDescription& desc, float letterSpacing, float wordSpacing)
     55     : m_font(desc, letterSpacing, wordSpacing)
     56 {
     57     m_font.update(0);
     58 }
     59 
     60 WebFontDescription WebFontImpl::fontDescription() const
     61 {
     62     return WebFontDescription(m_font.fontDescription(), m_font.letterSpacing(), m_font.wordSpacing());
     63 }
     64 
     65 int WebFontImpl::ascent() const
     66 {
     67     return m_font.fontMetrics().ascent();
     68 }
     69 
     70 int WebFontImpl::descent() const
     71 {
     72     return m_font.fontMetrics().descent();
     73 }
     74 
     75 int WebFontImpl::height() const
     76 {
     77     return m_font.fontMetrics().height();
     78 }
     79 
     80 int WebFontImpl::lineSpacing() const
     81 {
     82     return m_font.fontMetrics().lineSpacing();
     83 }
     84 
     85 float WebFontImpl::xHeight() const
     86 {
     87     return m_font.fontMetrics().xHeight();
     88 }
     89 
     90 void WebFontImpl::drawText(WebCanvas* canvas, const WebTextRun& run, const WebFloatPoint& leftBaseline,
     91                            WebColor color, const WebRect& clip, bool canvasIsOpaque,
     92                            int from, int to) const
     93 {
     94     FontCachePurgePreventer fontCachePurgePreventer;
     95     WebCore::FloatRect textClipRect(clip);
     96     TextRun textRun(run);
     97     TextRunPaintInfo runInfo(textRun);
     98     runInfo.from = from;
     99     runInfo.to = to == -1 ? textRun.length() : to;
    100     runInfo.bounds = textClipRect;
    101     GraphicsContext gc(canvas);
    102 
    103     gc.save();
    104     gc.setCertainlyOpaque(canvasIsOpaque);
    105     gc.setFillColor(color);
    106     gc.clip(textClipRect);
    107     m_font.drawText(&gc, runInfo, leftBaseline);
    108     gc.restore();
    109 }
    110 
    111 int WebFontImpl::calculateWidth(const WebTextRun& run) const
    112 {
    113     FontCachePurgePreventer fontCachePurgePreventer;
    114     return m_font.width(run, 0);
    115 }
    116 
    117 int WebFontImpl::offsetForPosition(const WebTextRun& run, float position) const
    118 {
    119     FontCachePurgePreventer fontCachePurgePreventer;
    120     return m_font.offsetForPosition(run, position, true);
    121 }
    122 
    123 WebFloatRect WebFontImpl::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const
    124 {
    125     FontCachePurgePreventer fontCachePurgePreventer;
    126     return m_font.selectionRectForText(run, leftBaseline, height, from, to);
    127 }
    128 
    129 } // namespace blink
    130