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      1 /*
      2  * Copyright (C) 2007 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 #include "config.h"
     26 #include "WebCoreTextRenderer.h"
     27 
     28 #include "Font.h"
     29 #include "FontDescription.h"
     30 #include "GraphicsContext.h"
     31 #include "StringTruncator.h"
     32 #include "TextRun.h"
     33 #include <wtf/unicode/Unicode.h>
     34 
     35 namespace WebCore {
     36 
     37 static bool shouldUseFontSmoothing = true;
     38 
     39 static bool isOneLeftToRightRun(const TextRun& run)
     40 {
     41     for (int i = 0; i < run.length(); i++) {
     42         WTF::Unicode::Direction direction = WTF::Unicode::direction(run[i]);
     43         if (direction == WTF::Unicode::RightToLeft || direction > WTF::Unicode::OtherNeutral)
     44             return false;
     45     }
     46     return true;
     47 }
     48 
     49 static void doDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)
     50 {
     51     TextRun run(text.characters(), text.length());
     52 
     53     context.setFillColor(color, ColorSpaceDeviceRGB);
     54     if (isOneLeftToRightRun(run))
     55         font.drawText(&context, run, point);
     56     else
     57         context.drawBidiText(font, run, point);
     58 
     59     if (underlinedIndex >= 0) {
     60         ASSERT(underlinedIndex < static_cast<int>(text.length()));
     61 
     62         int beforeWidth;
     63         if (underlinedIndex > 0) {
     64             TextRun beforeRun(text.characters(), underlinedIndex);
     65             beforeWidth = font.width(beforeRun);
     66         } else
     67             beforeWidth = 0;
     68 
     69         TextRun underlinedRun(text.characters() + underlinedIndex, 1);
     70         int underlinedWidth = font.width(underlinedRun);
     71 
     72         IntPoint underlinePoint(point);
     73         underlinePoint.move(beforeWidth, 1);
     74 
     75         context.setStrokeColor(color, ColorSpaceDeviceRGB);
     76         context.drawLineForText(underlinePoint, underlinedWidth, false);
     77     }
     78 }
     79 
     80 void WebCoreDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& color, int underlinedIndex)
     81 {
     82     context.save();
     83 
     84     doDrawTextAtPoint(context, text, point, font, color, underlinedIndex);
     85 
     86     context.restore();
     87 }
     88 
     89 void WebCoreDrawDoubledTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const Font& font, const Color& topColor, const Color& bottomColor, int underlinedIndex)
     90 {
     91     context.save();
     92 
     93     IntPoint textPos = point;
     94 
     95     doDrawTextAtPoint(context, text, textPos, font, bottomColor, underlinedIndex);
     96     textPos.move(0, -1);
     97     doDrawTextAtPoint(context, text, textPos, font, topColor, underlinedIndex);
     98 
     99     context.restore();
    100 }
    101 
    102 float WebCoreTextFloatWidth(const String& text, const Font& font)
    103 {
    104     return StringTruncator::width(text, font);
    105 }
    106 
    107 void WebCoreSetShouldUseFontSmoothing(bool smooth)
    108 {
    109     shouldUseFontSmoothing = smooth;
    110 }
    111 
    112 bool WebCoreShouldUseFontSmoothing()
    113 {
    114     return shouldUseFontSmoothing;
    115 }
    116 
    117 void WebCoreSetAlwaysUsesComplexTextCodePath(bool complex)
    118 {
    119     Font::setCodePath(complex ? Font::Complex : Font::Auto);
    120 }
    121 
    122 bool WebCoreAlwaysUsesComplexTextCodePath()
    123 {
    124     return Font::codePath() == Font::Complex;
    125 }
    126 
    127 } // namespace WebCore
    128