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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 "core/platform/DragImage.h"
     28 
     29 #include "platform/fonts/Font.h"
     30 #include "platform/fonts/FontCache.h"
     31 #include "platform/fonts/FontDescription.h"
     32 #include "platform/fonts/FontMetrics.h"
     33 #include "platform/geometry/FloatPoint.h"
     34 #include "platform/geometry/FloatRect.h"
     35 #include "platform/geometry/IntPoint.h"
     36 #include "platform/graphics/BitmapImage.h"
     37 #include "platform/graphics/Color.h"
     38 #include "platform/graphics/GraphicsContext.h"
     39 #include "platform/graphics/Image.h"
     40 #include "platform/graphics/ImageBuffer.h"
     41 #include "platform/graphics/skia/NativeImageSkia.h"
     42 #include "platform/text/StringTruncator.h"
     43 #include "platform/text/TextRun.h"
     44 #include "platform/transforms/AffineTransform.h"
     45 #include "platform/weborigin/KURL.h"
     46 #include "skia/ext/image_operations.h"
     47 #include "third_party/skia/include/core/SkCanvas.h"
     48 #include "third_party/skia/include/core/SkMatrix.h"
     49 #include "wtf/PassOwnPtr.h"
     50 #include "wtf/RefPtr.h"
     51 #include "wtf/text/WTFString.h"
     52 
     53 #include <algorithm>
     54 
     55 namespace WebCore {
     56 
     57 const float kDragLabelBorderX = 4;
     58 // Keep border_y in synch with DragController::LinkDragBorderInset.
     59 const float kDragLabelBorderY = 2;
     60 const float kLabelBorderYOffset = 2;
     61 
     62 const float kMaxDragLabelWidth = 300;
     63 const float kMaxDragLabelStringWidth = (kMaxDragLabelWidth - 2 * kDragLabelBorderX);
     64 
     65 const float kDragLinkLabelFontSize = 11;
     66 const float kDragLinkUrlFontSize = 10;
     67 
     68 PassOwnPtr<DragImage> DragImage::create(Image* image, RespectImageOrientationEnum shouldRespectImageOrientation, float deviceScaleFactor)
     69 {
     70     if (!image)
     71         return nullptr;
     72 
     73     RefPtr<NativeImageSkia> bitmap = image->nativeImageForCurrentFrame();
     74     if (!bitmap)
     75         return nullptr;
     76 
     77     if (image->isBitmapImage()) {
     78         ImageOrientation orientation = DefaultImageOrientation;
     79         BitmapImage* bitmapImage = toBitmapImage(image);
     80         IntSize sizeRespectingOrientation = bitmapImage->sizeRespectingOrientation();
     81 
     82         if (shouldRespectImageOrientation == RespectImageOrientation)
     83             orientation = bitmapImage->currentFrameOrientation();
     84 
     85         if (orientation != DefaultImageOrientation) {
     86             FloatRect destRect(FloatPoint(), sizeRespectingOrientation);
     87             if (orientation.usesWidthAsHeight())
     88                 destRect = destRect.transposedRect();
     89 
     90             SkBitmap skBitmap;
     91             skBitmap.setConfig(
     92                 SkBitmap::kARGB_8888_Config, sizeRespectingOrientation.width(), sizeRespectingOrientation.height());
     93             if (!skBitmap.allocPixels())
     94                 return nullptr;
     95 
     96             SkCanvas canvas(skBitmap);
     97             canvas.concat(affineTransformToSkMatrix(orientation.transformFromDefault(sizeRespectingOrientation)));
     98             canvas.drawBitmapRect(bitmap->bitmap(), 0, destRect);
     99 
    100             return adoptPtr(new DragImage(skBitmap, deviceScaleFactor));
    101         }
    102     }
    103 
    104     SkBitmap skBitmap;
    105     if (!bitmap->bitmap().copyTo(&skBitmap, SkBitmap::kARGB_8888_Config))
    106         return nullptr;
    107     return adoptPtr(new DragImage(skBitmap, deviceScaleFactor));
    108 }
    109 
    110 static Font deriveDragLabelFont(int size, FontWeight fontWeight, const FontDescription& systemFont)
    111 {
    112     FontDescription description = systemFont;
    113     description.setWeight(fontWeight);
    114     description.setSpecifiedSize(size);
    115     description.setComputedSize(size);
    116     Font result(description, 0, 0);
    117     result.update(0);
    118     return result;
    119 }
    120 
    121 PassOwnPtr<DragImage> DragImage::create(const KURL& url, const String& inLabel, const FontDescription& systemFont, float deviceScaleFactor)
    122 {
    123     const Font labelFont = deriveDragLabelFont(kDragLinkLabelFontSize, FontWeightBold, systemFont);
    124     const Font urlFont = deriveDragLabelFont(kDragLinkUrlFontSize, FontWeightNormal, systemFont);
    125     FontCachePurgePreventer fontCachePurgePreventer;
    126 
    127     bool drawURLString = true;
    128     bool clipURLString = false;
    129     bool clipLabelString = false;
    130 
    131     String urlString = url.string();
    132     String label = inLabel;
    133     if (label.isEmpty()) {
    134         drawURLString = false;
    135         label = urlString;
    136     }
    137 
    138     // First step is drawing the link drag image width.
    139     TextRun labelRun(label.impl());
    140     TextRun urlRun(urlString.impl());
    141     IntSize labelSize(labelFont.width(labelRun), labelFont.fontMetrics().ascent() + labelFont.fontMetrics().descent());
    142 
    143     if (labelSize.width() > kMaxDragLabelStringWidth) {
    144         labelSize.setWidth(kMaxDragLabelStringWidth);
    145         clipLabelString = true;
    146     }
    147 
    148     IntSize urlStringSize;
    149     IntSize imageSize(labelSize.width() + kDragLabelBorderX * 2, labelSize.height() + kDragLabelBorderY * 2);
    150 
    151     if (drawURLString) {
    152         urlStringSize.setWidth(urlFont.width(urlRun));
    153         urlStringSize.setHeight(urlFont.fontMetrics().ascent() + urlFont.fontMetrics().descent());
    154         imageSize.setHeight(imageSize.height() + urlStringSize.height());
    155         if (urlStringSize.width() > kMaxDragLabelStringWidth) {
    156             imageSize.setWidth(kMaxDragLabelWidth);
    157             clipURLString = true;
    158         } else
    159             imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + kDragLabelBorderX * 2);
    160     }
    161 
    162     // We now know how big the image needs to be, so we create and
    163     // fill the background
    164     IntSize scaledImageSize = imageSize;
    165     scaledImageSize.scale(deviceScaleFactor);
    166     OwnPtr<ImageBuffer> buffer(ImageBuffer::create(scaledImageSize));
    167     if (!buffer)
    168         return nullptr;
    169     buffer->context()->scale(FloatSize(deviceScaleFactor, deviceScaleFactor));
    170 
    171     const float DragLabelRadius = 5;
    172     const IntSize radii(DragLabelRadius, DragLabelRadius);
    173     IntRect rect(IntPoint(), imageSize);
    174     const Color backgroundColor(140, 140, 140);
    175     buffer->context()->fillRoundedRect(rect, radii, radii, radii, radii, backgroundColor);
    176 
    177     // Draw the text
    178     if (drawURLString) {
    179         if (clipURLString)
    180             urlString = StringTruncator::centerTruncate(urlString, imageSize.width() - (kDragLabelBorderX * 2.0f), urlFont, StringTruncator::EnableRoundingHacks);
    181         IntPoint textPos(kDragLabelBorderX, imageSize.height() - (kLabelBorderYOffset + urlFont.fontMetrics().descent()));
    182         TextRun textRun(urlString);
    183         buffer->context()->drawText(urlFont, TextRunPaintInfo(textRun), textPos);
    184     }
    185 
    186     if (clipLabelString)
    187         label = StringTruncator::rightTruncate(label, imageSize.width() - (kDragLabelBorderX * 2.0f), labelFont, StringTruncator::EnableRoundingHacks);
    188 
    189     IntPoint textPos(kDragLabelBorderX, kDragLabelBorderY + labelFont.pixelSize());
    190     TextRun textRun(label);
    191     buffer->context()->drawText(urlFont, TextRunPaintInfo(textRun), textPos);
    192 
    193     RefPtr<Image> image = buffer->copyImage();
    194     return DragImage::create(image.get(), DoNotRespectImageOrientation, deviceScaleFactor);
    195 }
    196 
    197 DragImage::DragImage(const SkBitmap& bitmap, float resolutionScale)
    198     : m_bitmap(bitmap)
    199     , m_resolutionScale(resolutionScale)
    200 {
    201 }
    202 
    203 DragImage::~DragImage()
    204 {
    205 }
    206 
    207 void DragImage::fitToMaxSize(const IntSize& srcSize, const IntSize& maxSize)
    208 {
    209     float heightResizeRatio = 0.0f;
    210     float widthResizeRatio = 0.0f;
    211     float resizeRatio = -1.0f;
    212     IntSize originalSize = size();
    213 
    214     if (srcSize.width() > maxSize.width()) {
    215         widthResizeRatio = maxSize.width() / static_cast<float>(srcSize.width());
    216         resizeRatio = widthResizeRatio;
    217     }
    218 
    219     if (srcSize.height() > maxSize.height()) {
    220         heightResizeRatio = maxSize.height() / static_cast<float>(srcSize.height());
    221         if ((resizeRatio < 0.0f) || (resizeRatio > heightResizeRatio))
    222             resizeRatio = heightResizeRatio;
    223     }
    224 
    225     if (srcSize == originalSize) {
    226         if (resizeRatio > 0.0f)
    227             scale(resizeRatio, resizeRatio);
    228         return;
    229     }
    230 
    231     // The image was scaled in the webpage so at minimum we must account for that scaling
    232     float scaleX = srcSize.width() / static_cast<float>(originalSize.width());
    233     float scaleY = srcSize.height() / static_cast<float>(originalSize.height());
    234     if (resizeRatio > 0.0f) {
    235         scaleX *= resizeRatio;
    236         scaleY *= resizeRatio;
    237     }
    238 
    239     scale(scaleX, scaleY);
    240 }
    241 
    242 void DragImage::scale(float scaleX, float scaleY)
    243 {
    244     int imageWidth = scaleX * m_bitmap.width();
    245     int imageHeight = scaleY * m_bitmap.height();
    246     m_bitmap = skia::ImageOperations::Resize(
    247         m_bitmap, skia::ImageOperations::RESIZE_LANCZOS3, imageWidth, imageHeight);
    248 }
    249 
    250 void DragImage::dissolveToFraction(float fraction)
    251 {
    252     m_bitmap.setAlphaType(kPremul_SkAlphaType);
    253     SkAutoLockPixels lock(m_bitmap);
    254 
    255     for (int row = 0; row < m_bitmap.height(); ++row) {
    256         for (int column = 0; column < m_bitmap.width(); ++column) {
    257             uint32_t* pixel = m_bitmap.getAddr32(column, row);
    258             *pixel = SkPreMultiplyARGB(
    259                 SkColorGetA(*pixel) * fraction,
    260                 SkColorGetR(*pixel),
    261                 SkColorGetG(*pixel),
    262                 SkColorGetB(*pixel));
    263         }
    264     }
    265 }
    266 
    267 } // namespace WebCore
    268