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