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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 "web/WebFontImpl.h"
     33 
     34 #include "platform/fonts/FontCache.h"
     35 #include "platform/fonts/FontDescription.h"
     36 #include "platform/graphics/GraphicsContext.h"
     37 #include "platform/text/TextRun.h"
     38 #include "public/platform/WebFloatPoint.h"
     39 #include "public/platform/WebFloatRect.h"
     40 #include "public/platform/WebRect.h"
     41 #include "public/web/WebFontDescription.h"
     42 #include "public/web/WebTextRun.h"
     43 #include <skia/ext/platform_canvas.h>
     44 
     45 namespace blink {
     46 
     47 WebFont* WebFont::create(const WebFontDescription& desc)
     48 {
     49     return new WebFontImpl(desc);
     50 }
     51 
     52 WebFontImpl::WebFontImpl(const FontDescription& desc)
     53     : m_font(desc)
     54 {
     55     m_font.update(nullptr);
     56 }
     57 
     58 WebFontDescription WebFontImpl::fontDescription() const
     59 {
     60     return WebFontDescription(m_font.fontDescription());
     61 }
     62 
     63 int WebFontImpl::ascent() const
     64 {
     65     return m_font.fontMetrics().ascent();
     66 }
     67 
     68 int WebFontImpl::descent() const
     69 {
     70     return m_font.fontMetrics().descent();
     71 }
     72 
     73 int WebFontImpl::height() const
     74 {
     75     return m_font.fontMetrics().height();
     76 }
     77 
     78 int WebFontImpl::lineSpacing() const
     79 {
     80     return m_font.fontMetrics().lineSpacing();
     81 }
     82 
     83 float WebFontImpl::xHeight() const
     84 {
     85     return m_font.fontMetrics().xHeight();
     86 }
     87 
     88 void WebFontImpl::drawText(WebCanvas* canvas, const WebTextRun& run, const WebFloatPoint& leftBaseline,
     89                            WebColor color, const WebRect& clip, bool canvasIsOpaque,
     90                            int from, int to) const
     91 {
     92     FontCachePurgePreventer fontCachePurgePreventer;
     93     FloatRect textClipRect(clip);
     94     TextRun textRun(run);
     95     TextRunPaintInfo runInfo(textRun);
     96     runInfo.from = from;
     97     runInfo.to = to == -1 ? textRun.length() : to;
     98     runInfo.bounds = textClipRect;
     99     GraphicsContext gc(canvas);
    100 
    101     gc.save();
    102     gc.setCertainlyOpaque(canvasIsOpaque);
    103     gc.setFillColor(color);
    104     gc.clip(textClipRect);
    105     m_font.drawText(&gc, runInfo, leftBaseline);
    106     gc.restore();
    107 }
    108 
    109 int WebFontImpl::calculateWidth(const WebTextRun& run) const
    110 {
    111     FontCachePurgePreventer fontCachePurgePreventer;
    112     return m_font.width(run, 0);
    113 }
    114 
    115 int WebFontImpl::offsetForPosition(const WebTextRun& run, float position) const
    116 {
    117     FontCachePurgePreventer fontCachePurgePreventer;
    118     return m_font.offsetForPosition(run, position, true);
    119 }
    120 
    121 WebFloatRect WebFontImpl::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const
    122 {
    123     FontCachePurgePreventer fontCachePurgePreventer;
    124     return m_font.selectionRectForText(run, leftBaseline, height, from, to);
    125 }
    126 
    127 } // namespace blink
    128