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