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