Source/WebKit2/UIProcess/FindIndicator.cpp

   1 /*
   2  * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "FindIndicator.h"
  28
  29 #include "ShareableBitmap.h"
  30 #include <WebCore/Gradient.h>
  31 #include <WebCore/GraphicsContext.h>
  32 #include <WebCore/IntRect.h>
  33 #include <WebCore/Path.h>
  34
  35 using namespace WebCore;
  36
  37 static const float cornerRadius = 3.0;
  38
  39 static const float shadowOffsetX = 0.0;
  40 static const float shadowOffsetY = 1.0;
  41 static const float shadowBlurRadius = 3.0;
  42
  43 static const int shadowRed = 0;
  44 static const int shadowGreen = 0;
  45 static const int shadowBlue = 0;
  46 static const int shadowAlpha = 204;
  47
  48 static const float lightBorderThickness = 1.0;
  49 static const float horizontalPaddingInsideLightBorder = 3.0;
  50 static const float verticalPaddingInsideLightBorder = 1.0;
  51
  52 static const float horizontalBorderInsideShadow = lightBorderThickness + horizontalPaddingInsideLightBorder;
  53 static const float verticalBorderInsideShadow = lightBorderThickness + verticalPaddingInsideLightBorder;
  54
  55 static const float leftBorderThickness = horizontalBorderInsideShadow + shadowOffsetX + shadowBlurRadius / 2.0;
  56 static const float topBorderThickness = verticalBorderInsideShadow - shadowOffsetY + shadowBlurRadius / 2.0;
  57 static const float rightBorderThickness = horizontalBorderInsideShadow - shadowOffsetX + shadowBlurRadius / 2.0;
  58 static const float bottomBorderThickness = verticalBorderInsideShadow + shadowOffsetY + shadowBlurRadius / 2.0;
  59
  60 static const float horizontalOutsetToCenterOfLightBorder = horizontalBorderInsideShadow - lightBorderThickness / 2.0;
  61 static const float verticalOutsetToCenterOfLightBorder = verticalBorderInsideShadow - lightBorderThickness / 2.0;
  62
  63 static const int lightBorderRed = 245;
  64 static const int lightBorderGreen = 230;
  65 static const int lightBorderBlue = 0;
  66 static const int lightBorderAlpha = 255;
  67
  68 static const int gradientDarkRed = 237;
  69 static const int gradientDarkGreen = 204;
  70 static const int gradientDarkBlue = 0;
  71 static const int gradientDarkAlpha = 255;
  72
  73 static const int gradientLightRed = 242;
  74 static const int gradientLightGreen = 239;
  75 static const int gradientLightBlue = 0;
  76 static const int gradientLightAlpha = 255;
  77
  78 namespace WebKit {
  79
  80 PassRefPtr<FindIndicator> FindIndicator::create(const FloatRect& selectionRectInWindowCoordinates, const Vector<FloatRect>& textRectsInSelectionRectCoordinates, float contentImageScaleFactor, const ShareableBitmap::Handle& contentImageHandle)
  81 {
  82     RefPtr<ShareableBitmap> contentImage = ShareableBitmap::create(contentImageHandle);
  83     if (!contentImage)
  84         return 0;
  85     ASSERT(contentImageScaleFactor != 1 || contentImage->size() == enclosingIntRect(selectionRectInWindowCoordinates).size());
  86
  87     return adoptRef(new FindIndicator(selectionRectInWindowCoordinates, textRectsInSelectionRectCoordinates, contentImageScaleFactor, contentImage.release()));
  88 }
  89
  90 static bool findIndicatorsForTextRectsOverlap(const Vector<FloatRect>& textRects)
  91 {
  92     size_t count = textRects.size();
  93     if (count <= 1)
  94         return false;
  95
  96     Vector<FloatRect> indicatorRects;
  97     indicatorRects.reserveInitialCapacity(count);
  98
  99     for (size_t i = 0; i < count; ++i) {
 100         FloatRect indicatorRect = textRects[i];
 101         indicatorRect.move(-leftBorderThickness, -topBorderThickness);
 102         indicatorRect.expand(leftBorderThickness + rightBorderThickness, topBorderThickness + bottomBorderThickness);
 103
 104         for (size_t j = indicatorRects.size(); j; ) {
 105             --j;
 106             if (indicatorRect.intersects(indicatorRects[j]))
 107                 return true;
 108         }
 109
 110         indicatorRects.uncheckedAppend(indicatorRect);
 111     }
 112
 113     return false;
 114 }
 115
 116 FindIndicator::FindIndicator(const WebCore::FloatRect& selectionRectInWindowCoordinates, const Vector<WebCore::FloatRect>& textRectsInSelectionRectCoordinates, float contentImageScaleFactor, PassRefPtr<ShareableBitmap> contentImage)
 117     : m_selectionRectInWindowCoordinates(selectionRectInWindowCoordinates)
 118     , m_textRectsInSelectionRectCoordinates(textRectsInSelectionRectCoordinates)
 119     , m_contentImageScaleFactor(contentImageScaleFactor)
 120     , m_contentImage(contentImage)
 121 {
 122     if (findIndicatorsForTextRectsOverlap(m_textRectsInSelectionRectCoordinates)) {
 123         m_textRectsInSelectionRectCoordinates[0] = unionRect(m_textRectsInSelectionRectCoordinates);
 124         m_textRectsInSelectionRectCoordinates.shrink(1);
 125     }
 126 }
 127
 128 FindIndicator::~FindIndicator()
 129 {
 130 }
 131
 132 static FloatRect inflateRect(const FloatRect& rect, float inflateX, float inflateY)
 133 {
 134     FloatRect inflatedRect = rect;
 135     inflatedRect.inflateX(inflateX);
 136     inflatedRect.inflateY(inflateY);
 137
 138     return inflatedRect;
 139 }
 140
 141 FloatRect FindIndicator::frameRect() const
 142 {
 143     return FloatRect(m_selectionRectInWindowCoordinates.x() - leftBorderThickness, m_selectionRectInWindowCoordinates.y() - topBorderThickness,
 144                      m_selectionRectInWindowCoordinates.width() + rightBorderThickness + leftBorderThickness,
 145                      m_selectionRectInWindowCoordinates.height() + topBorderThickness + bottomBorderThickness);
 146 }
 147
 148 static Color lightBorderColor()
 149 {
 150     return Color(lightBorderRed, lightBorderGreen, lightBorderBlue, lightBorderAlpha);
 151 }
 152
 153 static Color shadowColor()
 154 {
 155     return Color(shadowRed, shadowGreen, shadowBlue, shadowAlpha);
 156 }
 157
 158 static Color gradientLightColor()
 159 {
 160     return Color(gradientLightRed, gradientLightGreen, gradientLightBlue, gradientLightAlpha);
 161 }
 162
 163 static Color gradientDarkColor()
 164 {
 165     return Color(gradientDarkRed, gradientDarkGreen, gradientDarkBlue, gradientDarkAlpha);
 166 }
 167
 168 static Path pathWithRoundedRect(const FloatRect& pathRect, float radius)
 169 {
 170     Path path;
 171     path.addRoundedRect(pathRect, FloatSize(radius, radius));
 172
 173     return path;
 174 }
 175
 176 void FindIndicator::draw(GraphicsContext& graphicsContext, const IntRect& dirtyRect)
 177 {
 178     for (size_t i = 0; i < m_textRectsInSelectionRectCoordinates.size(); ++i) {
 179         FloatRect textRect = m_textRectsInSelectionRectCoordinates[i];
 180         textRect.move(leftBorderThickness, topBorderThickness);
 181
 182         FloatRect outerPathRect = inflateRect(textRect, horizontalOutsetToCenterOfLightBorder, verticalOutsetToCenterOfLightBorder);
 183         FloatRect innerPathRect = inflateRect(textRect, horizontalPaddingInsideLightBorder, verticalPaddingInsideLightBorder);
 184
 185         {
 186             GraphicsContextStateSaver stateSaver(graphicsContext);
 187             graphicsContext.setShadow(FloatSize(shadowOffsetX, shadowOffsetY), shadowBlurRadius, shadowColor(), ColorSpaceSRGB);
 188             graphicsContext.setFillColor(lightBorderColor(), ColorSpaceDeviceRGB);
 189             graphicsContext.fillPath(pathWithRoundedRect(outerPathRect, cornerRadius));
 190         }
 191
 192         {
 193             GraphicsContextStateSaver stateSaver(graphicsContext);
 194             graphicsContext.clip(pathWithRoundedRect(innerPathRect, cornerRadius));
 195             RefPtr<Gradient> gradient = Gradient::create(FloatPoint(innerPathRect.x(), innerPathRect.y()), FloatPoint(innerPathRect.x(), innerPathRect.maxY()));
 196             gradient->addColorStop(0, gradientLightColor());
 197             gradient->addColorStop(1, gradientDarkColor());
 198             graphicsContext.setFillGradient(gradient);
 199             graphicsContext.fillRect(outerPathRect);
 200         }
 201
 202         {
 203             GraphicsContextStateSaver stateSaver(graphicsContext);
 204             graphicsContext.translate(FloatSize(roundf(leftBorderThickness), roundf(topBorderThickness)));
 205
 206             IntRect contentImageRect = enclosingIntRect(m_textRectsInSelectionRectCoordinates[i]);
 207             m_contentImage->paint(graphicsContext, m_contentImageScaleFactor, contentImageRect.location(), contentImageRect);
 208         }
 209     }
 210 }
 211
 212 } // namespace WebKit