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
26#include "config.h"
27#include "WebKitGraphics.h"
28
29#include "WebKit.h"
30#include "WebKitDLL.h"
31
32#include "WebPreferences.h"
33
34#include <WebCore/Font.h>
35#include <WebCore/FontCache.h>
36#include <WebCore/FontDescription.h>
37#include <WebCore/FontSelector.h>
38#include <WebCore/GraphicsContext.h>
39#include <WebCore/StringTruncator.h>
40#include <WebCore/WebCoreTextRenderer.h>
41#include <wtf/text/WTFString.h>
42#include <wtf/unicode/CharacterNames.h>
43
44#include <CoreGraphics/CoreGraphics.h>
45
46#include <WebKitSystemInterface/WebKitSystemInterface.h>
47
48using namespace WebCore;
49
50static Font makeFont(const WebFontDescription& description)
51{
52    AtomicString::init();
53
54    String fontFamilyString(description.family, description.familyLength);
55
56    FontDescription f;
57    f.setOneFamily(fontFamilyString);
58    f.setSpecifiedSize(description.size);
59    f.setComputedSize(description.size);
60    f.setItalic(description.italic);
61    f.setWeight(description.bold ? FontWeightBold : FontWeightNormal);
62    f.setIsAbsoluteSize(true);
63
64    FontSmoothingType smoothingType;
65    if (SUCCEEDED(WebPreferences::sharedStandardPreferences()->fontSmoothing(&smoothingType)))
66        f.setRenderingMode(smoothingType == FontSmoothingTypeWindows ? AlternateRenderingMode : NormalRenderingMode);
67
68    Font font(f, 0, 0);
69    font.update(0);
70
71    return font;
72}
73
74// Text shadow is added post 3.1.1.  In order for nightlies to not break Safari 3.1.1, we should still allow
75// the old WebTextRenderInfo that has a smaller structSize than the current one with the new text shadow data members.
76struct WebTextRenderInfoWithoutShadow
77{
78    DWORD structSize;
79    CGContextRef cgContext;
80    LPCTSTR text;
81    int length;
82    POINT pt;
83    const WebFontDescription* description;
84    CGColorRef color;
85    int underlinedIndex;
86    bool drawAsPassword;
87    int overrideSmoothingLevel; // pass in -1 if caller does not want to override smoothing level
88};
89
90void WebDrawText(WebTextRenderInfo* info)
91{
92    if (!info || info->structSize < sizeof(WebTextRenderInfoWithoutShadow) || !info->cgContext || !info->description)
93        return;
94
95    int oldFontSmoothingLevel = -1;
96    if (info->overrideSmoothingLevel >= 0) {
97        oldFontSmoothingLevel = wkGetFontSmoothingLevel();
98        wkSetFontSmoothingLevel(info->overrideSmoothingLevel);
99    }
100
101    {
102        GraphicsContext context(info->cgContext);
103        String drawString(info->text, info->length);
104        if (info->drawAsPassword)
105            drawString.fill(WTF::Unicode::bullet);
106
107        context.save();
108
109        // Set shadow setting
110        if (info->structSize == sizeof(WebTextRenderInfo) &&
111            (info->shadowOffset.cx || info->shadowOffset.cy || info->shadowBlur || info->shadowColor))
112            context.setShadow(FloatSize(info->shadowOffset.cx, info->shadowOffset.cy), info->shadowBlur, info->shadowColor, ColorSpaceDeviceRGB);
113
114        WebCoreDrawTextAtPoint(context, drawString, info->pt, makeFont(*(info->description)), info->color, info->underlinedIndex);
115        context.restore();
116    }
117
118    if (info->overrideSmoothingLevel >= 0)
119        wkSetFontSmoothingLevel(oldFontSmoothingLevel);
120}
121
122float TextFloatWidth(LPCTSTR text, int length, const WebFontDescription& description)
123{
124    return WebCoreTextFloatWidth(String(text, length), makeFont(description));
125}
126
127void FontMetrics(const WebFontDescription& description, int* ascent, int* descent, int* lineSpacing)
128{
129    if (!ascent && !descent && !lineSpacing)
130        return;
131
132    Font font(makeFont(description));
133    const WebCore::FontMetrics& fontMetrics(font.fontMetrics());
134
135    if (ascent)
136        *ascent = fontMetrics.ascent();
137
138    if (descent)
139        *descent = fontMetrics.descent();
140
141    if (lineSpacing)
142        *lineSpacing = fontMetrics.lineSpacing();
143}
144
145unsigned CenterTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)
146{
147    ASSERT(buffer);
148
149    FontCachePurgePreventer fontCachePurgePreventer;
150
151    String result = StringTruncator::centerTruncate(String(text, length), width, makeFont(description), StringTruncator::EnableRoundingHacks);
152    memcpy(buffer, result.characters(), result.length() * sizeof(UChar));
153    buffer[result.length()] = '\0';
154    return result.length();
155}
156
157unsigned RightTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)
158{
159    ASSERT(buffer);
160
161    FontCachePurgePreventer fontCachePurgePreventer;
162
163    String result = StringTruncator::rightTruncate(String(text, length), width, makeFont(description), StringTruncator::EnableRoundingHacks);
164    memcpy(buffer, result.characters(), result.length() * sizeof(UChar));
165    buffer[result.length()] = '\0';
166    return result.length();
167}
168
169void WebKitSetShouldUseFontSmoothing(bool smooth)
170{
171    WebCoreSetShouldUseFontSmoothing(smooth);
172}
173
174bool WebKitShouldUseFontSmoothing()
175{
176    return WebCoreShouldUseFontSmoothing();
177}
178