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      1 /*
      2  * Copyright (C) 2007 Kevin Ollivier.  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 
     26 #include "config.h"
     27 #include "Font.h"
     28 
     29 #include "FontFallbackList.h"
     30 #include "GlyphBuffer.h"
     31 #include "GraphicsContext.h"
     32 #include "IntRect.h"
     33 #include "NotImplemented.h"
     34 #include "SimpleFontData.h"
     35 #include "TextRun.h"
     36 
     37 #if OS(WINDOWS)
     38 #include "UniscribeController.h"
     39 typedef WebCore::UniscribeController ComplexTextController;
     40 #endif
     41 
     42 #if OS(DARWIN)
     43 #include "mac/ComplexTextController.h"
     44 #endif
     45 
     46 #include <wx/dcclient.h>
     47 #include "fontprops.h"
     48 #include "non-kerned-drawing.h"
     49 
     50 namespace WebCore {
     51 
     52 bool Font::canReturnFallbackFontsForComplexText()
     53 {
     54 #if OS(WINDOWS) || OS(DARWIN)
     55     return true;
     56 #else
     57     return false;
     58 #endif
     59 }
     60 
     61 bool Font::canExpandAroundIdeographsInComplexText()
     62 {
     63 #if OS(DARWIN)
     64     return true;
     65 #else
     66     return false;
     67 #endif
     68 }
     69 
     70 void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
     71                       int from, int numGlyphs, const FloatPoint& point) const
     72 {
     73     // prepare DC
     74     Color color = graphicsContext->fillColor();
     75 
     76     // We can't use wx drawing methods on Win/Linux because they automatically kern text
     77     // so we've created a function with platform dependent drawing implementations that
     78     // will hopefully be folded into wx once the API has solidified.
     79     // see platform/wx/wxcode/<platform> for the implementations.
     80     drawTextWithSpacing(graphicsContext, font, color, glyphBuffer, from, numGlyphs, point);
     81 }
     82 
     83 FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h, int from, int to) const
     84 {
     85 #if OS(WINDOWS) || OS(DARWIN)
     86     ComplexTextController it(this, run);
     87     it.advance(from);
     88     float beforeWidth = it.runWidthSoFar();
     89     it.advance(to);
     90     float afterWidth = it.runWidthSoFar();
     91 
     92     // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
     93     if (run.rtl()) {
     94 #if OS(WINDOWS)
     95         it.advance(run.length());
     96         float totalWidth = it.runWidthSoFar();
     97         return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
     98 #else
     99         float totalWidth = it.totalWidth();
    100         return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
    101 #endif
    102     }
    103 
    104     return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h);
    105 #else
    106     notImplemented();
    107     return FloatRect();
    108 #endif
    109 }
    110 
    111 float Font::getGlyphsAndAdvancesForComplexText(const TextRun& /* run */, int /* from */, int /* to */, GlyphBuffer& /* glyphBuffer */, ForTextEmphasisOrNot /* forTextEmphasis */) const
    112 {
    113     // FIXME: Implement this by moving most of the drawComplexText() implementation in here. Set up the
    114     // ComplexTextController according to forTextEmphasis.
    115     notImplemented();
    116     return 0;
    117 }
    118 
    119 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
    120 {
    121 #if OS(WINDOWS) || OS(DARWIN)
    122     // This glyph buffer holds our glyphs + advances + font data for each glyph.
    123     GlyphBuffer glyphBuffer;
    124 
    125     float startX = point.x();
    126     ComplexTextController controller(this, run);
    127     controller.advance(from);
    128     float beforeWidth = controller.runWidthSoFar();
    129     controller.advance(to, &glyphBuffer);
    130 
    131     // We couldn't generate any glyphs for the run.  Give up.
    132     if (glyphBuffer.isEmpty())
    133         return;
    134 
    135     float afterWidth = controller.runWidthSoFar();
    136 
    137     if (run.rtl()) {
    138 #if OS(WINDOWS)
    139         controller.advance(run.length());
    140         startX += controller.runWidthSoFar() - afterWidth;
    141 #else
    142         startX += controller.totalWidth() - afterWidth;
    143         for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end)
    144             glyphBuffer.swap(i, end);
    145 #endif
    146     } else
    147         startX += beforeWidth;
    148 
    149     // Draw the glyph buffer now at the starting point returned in startX.
    150     FloatPoint startPoint(startX, point.y());
    151     drawGlyphBuffer(context, glyphBuffer, startPoint);
    152 #else
    153     notImplemented();
    154 #endif
    155 }
    156 
    157 void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const
    158 {
    159     GlyphBuffer glyphBuffer;
    160     float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer, ForTextEmphasis);
    161 
    162     if (glyphBuffer.isEmpty())
    163         return;
    164 
    165     drawEmphasisMarks(context, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
    166 }
    167 
    168 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const
    169 {
    170 #if OS(WINDOWS) || OS(DARWIN)
    171     ComplexTextController controller(this, run, fallbackFonts);
    172 #if OS(WINDOWS)
    173     controller.advance(run.length());
    174     return controller.runWidthSoFar();
    175 #else
    176     return controller.totalWidth();
    177 #endif
    178 #else
    179     notImplemented();
    180     return 0;
    181 #endif
    182 }
    183 
    184 int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const
    185 {
    186 #if OS(WINDOWS) || OS(DARWIN)
    187     ComplexTextController controller(this, run);
    188     return controller.offsetForPosition(x, includePartialGlyphs);
    189 #else
    190     notImplemented();
    191     return 0;
    192 #endif
    193 }
    194 }
    195