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/FontDescription.h>

    38 #include <WebCore/FontSelector.h>

    39 #include <WebCore/GraphicsContext.h>

    40 #include <WebCore/PlatformString.h>

    41 #include <WebCore/StringTruncator.h>

    42 #include <WebCore/WebCoreTextRenderer.h>

    43 

    44 #include <CoreGraphics/CoreGraphics.h>

    45 #pragma warning(pop)

    46 

    47 #include <WebKitSystemInterface/WebKitSystemInterface.h>

    48 

    49 using namespace WebCore;

    50 

    51 static Font makeFont(const WebFontDescription& description)

    52 {

    53     AtomicString::init();

    54 

    55     String fontFamilyString(description.family, description.familyLength);

    56 

    57     FontDescription f;

    58     FontFamily family;

    59     family.setFamily(fontFamilyString);

    60     f.setFamily(family);

    61     f.setSpecifiedSize(description.size);

    62     f.setComputedSize(description.size);

    63     f.setItalic(description.italic);

    64     f.setWeight(description.bold ? FontWeightBold : FontWeightNormal);

    65     f.setIsAbsoluteSize(true);

    66 

    67     FontSmoothingType smoothingType;

    68     if (SUCCEEDED(WebPreferences::sharedStandardPreferences()->fontSmoothing(&smoothingType)))

    69         f.setRenderingMode(smoothingType == FontSmoothingTypeWindows ? AlternateRenderingMode : NormalRenderingMode);

    70 

    71     Font font(f, 0, 0);

    72     font.update(0);

    73 

    74     return font;

    75 }

    76 

    77 // Text shadow is added post 3.1.1.  In order for nightlies to not break Safari 3.1.1, we should still allow

    78 // the old WebTextRenderInfo that has a smaller structSize than the current one with the new text shadow data members.

    79 struct WebTextRenderInfoWithoutShadow

    80 {

    81     DWORD structSize;

    82     CGContextRef cgContext;

    83     LPCTSTR text;

    84     int length;

    85     POINT pt;

    86     const WebFontDescription* description;

    87     CGColorRef color;

    88     int underlinedIndex;

    89     bool drawAsPassword;

    90     int overrideSmoothingLevel; // pass in -1 if caller does not want to override smoothing level

    91 };

    92 

    93 void WebDrawText(WebTextRenderInfo* info)

    94 {

    95     if (!info || info->structSize < sizeof(WebTextRenderInfoWithoutShadow) || !info->cgContext || !info->description)

    96         return;

    97 

    98     int oldFontSmoothingLevel = -1;

    99     if (info->overrideSmoothingLevel >= 0) {

   100         oldFontSmoothingLevel = wkGetFontSmoothingLevel();

   101         wkSetFontSmoothingLevel(info->overrideSmoothingLevel);

   102     }

   103 

   104     {

   105         GraphicsContext context(info->cgContext);

   106         String drawString(info->text, info->length);

   107         if (info->drawAsPassword)

   108             drawString = drawString.impl()->secure(WebCore::bullet);

   109 

   110         context.save();

   111 

   112         // Set shadow setting

   113         if (info->structSize == sizeof(WebTextRenderInfo) &&

   114             (info->shadowOffset.cx || info->shadowOffset.cy || info->shadowBlur || info->shadowColor))

   115             context.setShadow(FloatSize(info->shadowOffset.cx, info->shadowOffset.cy), info->shadowBlur, info->shadowColor, DeviceColorSpace);

   116 

   117         WebCoreDrawTextAtPoint(context, drawString, info->pt, makeFont(*(info->description)), info->color, info->underlinedIndex);

   118         context.restore();

   119     }

   120 

   121     if (info->overrideSmoothingLevel >= 0)

   122         wkSetFontSmoothingLevel(oldFontSmoothingLevel);

   123 }

   124 

   125 float TextFloatWidth(LPCTSTR text, int length, const WebFontDescription& description)

   126 {

   127     return WebCoreTextFloatWidth(String(text, length), makeFont(description));

   128 }

   129 

   130 void FontMetrics(const WebFontDescription& description, int* ascent, int* descent, int* lineSpacing)

   131 {

   132     if (!ascent && !descent && !lineSpacing)

   133         return;

   134 

   135     Font font(makeFont(description));

   136 

   137     if (ascent)

   138         *ascent = font.ascent();

   139 

   140     if (descent)

   141         *descent = font.descent();

   142 

   143     if (lineSpacing)

   144         *lineSpacing = font.lineSpacing();

   145 }

   146 

   147 unsigned CenterTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)

   148 {

   149     ASSERT(buffer);

   150 

   151     String result = StringTruncator::centerTruncate(String(text, length), width, makeFont(description), false);

   152     memcpy(buffer, result.characters(), result.length() * sizeof(UChar));

   153     buffer[result.length()] = '\0';

   154     return result.length();

   155 }

   156 

   157 unsigned RightTruncateStringToWidth(LPCTSTR text, int length, const WebFontDescription& description, float width, WCHAR* buffer)

   158 {

   159     ASSERT(buffer);

   160 

   161     String result = StringTruncator::rightTruncate(String(text, length), width, makeFont(description), false);

   162     memcpy(buffer, result.characters(), result.length() * sizeof(UChar));

   163     buffer[result.length()] = '\0';

   164     return result.length();

   165 }

   166 

   167 void WebKitSetShouldUseFontSmoothing(bool smooth)

   168 {

   169     WebCoreSetShouldUseFontSmoothing(smooth);

   170 }

   171 

   172 bool WebKitShouldUseFontSmoothing()

   173 {

   174     return WebCoreShouldUseFontSmoothing();

   175 }