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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 "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/BidiTextRun.h"
     43 #include "platform/text/StringTruncator.h"
     44 #include "platform/text/TextRun.h"
     45 #include "platform/transforms/AffineTransform.h"
     46 #include "platform/weborigin/KURL.h"
     47 #include "skia/ext/image_operations.h"
     48 #include "third_party/skia/include/core/SkCanvas.h"
     49 #include "third_party/skia/include/core/SkMatrix.h"
     50 #include "wtf/PassOwnPtr.h"
     51 #include "wtf/RefPtr.h"
     52 #include "wtf/text/WTFString.h"
     53 
     54 #include <algorithm>
     55 
     56 namespace blink {
     57 
     58 const float kDragLabelBorderX = 4;
     59 // Keep border_y in synch with DragController::LinkDragBorderInset.
     60 const float kDragLabelBorderY = 2;
     61 const float kLabelBorderYOffset = 2;
     62 
     63 const float kMaxDragLabelWidth = 300;
     64 const float kMaxDragLabelStringWidth = (kMaxDragLabelWidth - 2 * kDragLabelBorderX);
     65 
     66 const float kDragLinkLabelFontSize = 11;
     67 const float kDragLinkUrlFontSize = 10;
     68 
     69 PassOwnPtr<DragImage> DragImage::create(Image* image, RespectImageOrientationEnum shouldRespectImageOrientation, float deviceScaleFactor)
     70 {
     71     if (!image)
     72         return nullptr;
     73 
     74     RefPtr<NativeImageSkia> bitmap = image->nativeImageForCurrentFrame();
     75     if (!bitmap)
     76         return nullptr;
     77 
     78     if (image->isBitmapImage()) {
     79         ImageOrientation orientation = DefaultImageOrientation;
     80         BitmapImage* bitmapImage = toBitmapImage(image);
     81         IntSize sizeRespectingOrientation = bitmapImage->sizeRespectingOrientation();
     82 
     83         if (shouldRespectImageOrientation == RespectImageOrientation)
     84             orientation = bitmapImage->currentFrameOrientation();
     85 
     86         if (orientation != DefaultImageOrientation) {
     87             FloatRect destRect(FloatPoint(), sizeRespectingOrientation);
     88             if (orientation.usesWidthAsHeight())
     89                 destRect = destRect.transposedRect();
     90 
     91             SkBitmap skBitmap;
     92             if (!skBitmap.tryAllocN32Pixels(sizeRespectingOrientation.width(), sizeRespectingOrientation.height()))
     93                 return nullptr;
     94 
     95             SkCanvas canvas(skBitmap);
     96             canvas.concat(affineTransformToSkMatrix(orientation.transformFromDefault(sizeRespectingOrientation)));
     97             canvas.drawBitmapRect(bitmap->bitmap(), 0, destRect);
     98 
     99             return adoptPtr(new DragImage(skBitmap, deviceScaleFactor));
    100         }
    101     }
    102 
    103     SkBitmap skBitmap;
    104     if (!bitmap->bitmap().copyTo(&skBitmap, kN32_SkColorType))
    105         return nullptr;
    106     return adoptPtr(new DragImage(skBitmap, deviceScaleFactor));
    107 }
    108 
    109 static Font deriveDragLabelFont(int size, FontWeight fontWeight, const FontDescription& systemFont)
    110 {
    111     FontDescription description = systemFont;
    112     description.setWeight(fontWeight);
    113     description.setSpecifiedSize(size);
    114     description.setComputedSize(size);
    115     Font result(description);
    116     result.update(nullptr);
    117     return result;
    118 }
    119 
    120 PassOwnPtr<DragImage> DragImage::create(const KURL& url, const String& inLabel, const FontDescription& systemFont, float deviceScaleFactor)
    121 {
    122     const Font labelFont = deriveDragLabelFont(kDragLinkLabelFontSize, FontWeightBold, systemFont);
    123     const Font urlFont = deriveDragLabelFont(kDragLinkUrlFontSize, FontWeightNormal, systemFont);
    124     FontCachePurgePreventer fontCachePurgePreventer;
    125 
    126     bool drawURLString = true;
    127     bool clipURLString = false;
    128     bool clipLabelString = false;
    129 
    130     String urlString = url.string();
    131     String label = inLabel.stripWhiteSpace();
    132     if (label.isEmpty()) {
    133         drawURLString = false;
    134         label = urlString;
    135     }
    136 
    137     // First step is drawing the link drag image width.
    138     TextRun labelRun(label.impl());
    139     TextRun urlRun(urlString.impl());
    140     IntSize labelSize(labelFont.width(labelRun), labelFont.fontMetrics().ascent() + labelFont.fontMetrics().descent());
    141 
    142     if (labelSize.width() > kMaxDragLabelStringWidth) {
    143         labelSize.setWidth(kMaxDragLabelStringWidth);
    144         clipLabelString = true;
    145     }
    146 
    147     IntSize urlStringSize;
    148     IntSize imageSize(labelSize.width() + kDragLabelBorderX * 2, labelSize.height() + kDragLabelBorderY * 2);
    149 
    150     if (drawURLString) {
    151         urlStringSize.setWidth(urlFont.width(urlRun));
    152         urlStringSize.setHeight(urlFont.fontMetrics().ascent() + urlFont.fontMetrics().descent());
    153         imageSize.setHeight(imageSize.height() + urlStringSize.height());
    154         if (urlStringSize.width() > kMaxDragLabelStringWidth) {
    155             imageSize.setWidth(kMaxDragLabelWidth);
    156             clipURLString = true;
    157         } else
    158             imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + kDragLabelBorderX * 2);
    159     }
    160 
    161     // We now know how big the image needs to be, so we create and
    162     // fill the background
    163     IntSize scaledImageSize = imageSize;
    164     scaledImageSize.scale(deviceScaleFactor);
    165     OwnPtr<ImageBuffer> buffer(ImageBuffer::create(scaledImageSize));
    166     if (!buffer)
    167         return nullptr;
    168     buffer->context()->scale(deviceScaleFactor, deviceScaleFactor);
    169 
    170     const float DragLabelRadius = 5;
    171     const IntSize radii(DragLabelRadius, DragLabelRadius);
    172     IntRect rect(IntPoint(), imageSize);
    173     const Color backgroundColor(140, 140, 140);
    174     buffer->context()->fillRoundedRect(rect, radii, radii, radii, radii, backgroundColor);
    175 
    176     // Draw the text
    177     if (drawURLString) {
    178         if (clipURLString)
    179             urlString = StringTruncator::centerTruncate(urlString, imageSize.width() - (kDragLabelBorderX * 2.0f), urlFont);
    180         IntPoint textPos(kDragLabelBorderX, imageSize.height() - (kLabelBorderYOffset + urlFont.fontMetrics().descent()));
    181         TextRun textRun(urlString);
    182         buffer->context()->drawText(urlFont, TextRunPaintInfo(textRun), textPos);
    183     }
    184 
    185     if (clipLabelString)
    186         label = StringTruncator::rightTruncate(label, imageSize.width() - (kDragLabelBorderX * 2.0f), labelFont);
    187 
    188     bool hasStrongDirectionality;
    189     TextRun textRun = textRunWithDirectionality(label, hasStrongDirectionality);
    190     IntPoint textPos(kDragLabelBorderX, kDragLabelBorderY + labelFont.fontDescription().computedPixelSize());
    191     if (hasStrongDirectionality && textRun.direction() == RTL) {
    192         float textWidth = labelFont.width(textRun);
    193         int availableWidth = imageSize.width() - kDragLabelBorderX * 2;
    194         textPos.setX(availableWidth - ceilf(textWidth));
    195     }
    196     buffer->context()->drawBidiText(labelFont, TextRunPaintInfo(textRun), textPos);
    197 
    198     RefPtr<Image> image = buffer->copyImage();
    199     return DragImage::create(image.get(), DoNotRespectImageOrientation, deviceScaleFactor);
    200 }
    201 
    202 DragImage::DragImage(const SkBitmap& bitmap, float resolutionScale)
    203     : m_bitmap(bitmap)
    204     , m_resolutionScale(resolutionScale)
    205 {
    206 }
    207 
    208 DragImage::~DragImage()
    209 {
    210 }
    211 
    212 void DragImage::fitToMaxSize(const IntSize& srcSize, const IntSize& maxSize)
    213 {
    214     float heightResizeRatio = 0.0f;
    215     float widthResizeRatio = 0.0f;
    216     float resizeRatio = -1.0f;
    217     IntSize originalSize = size();
    218 
    219     if (srcSize.width() > maxSize.width()) {
    220         widthResizeRatio = maxSize.width() / static_cast<float>(srcSize.width());
    221         resizeRatio = widthResizeRatio;
    222     }
    223 
    224     if (srcSize.height() > maxSize.height()) {
    225         heightResizeRatio = maxSize.height() / static_cast<float>(srcSize.height());
    226         if ((resizeRatio < 0.0f) || (resizeRatio > heightResizeRatio))
    227             resizeRatio = heightResizeRatio;
    228     }
    229 
    230     if (srcSize == originalSize) {
    231         if (resizeRatio > 0.0f)
    232             scale(resizeRatio, resizeRatio);
    233         return;
    234     }
    235 
    236     // The image was scaled in the webpage so at minimum we must account for that scaling
    237     float scaleX = srcSize.width() / static_cast<float>(originalSize.width());
    238     float scaleY = srcSize.height() / static_cast<float>(originalSize.height());
    239     if (resizeRatio > 0.0f) {
    240         scaleX *= resizeRatio;
    241         scaleY *= resizeRatio;
    242     }
    243 
    244     scale(scaleX, scaleY);
    245 }
    246 
    247 void DragImage::scale(float scaleX, float scaleY)
    248 {
    249     int imageWidth = scaleX * m_bitmap.width();
    250     int imageHeight = scaleY * m_bitmap.height();
    251     m_bitmap = skia::ImageOperations::Resize(
    252         m_bitmap, skia::ImageOperations::RESIZE_LANCZOS3, imageWidth, imageHeight);
    253 }
    254 
    255 void DragImage::dissolveToFraction(float fraction)
    256 {
    257     m_bitmap.setAlphaType(kPremul_SkAlphaType);
    258     SkAutoLockPixels lock(m_bitmap);
    259 
    260     for (int row = 0; row < m_bitmap.height(); ++row) {
    261         for (int column = 0; column < m_bitmap.width(); ++column) {
    262             uint32_t* pixel = m_bitmap.getAddr32(column, row);
    263             *pixel = SkPreMultiplyARGB(
    264                 SkColorGetA(*pixel) * fraction,
    265                 SkColorGetR(*pixel),
    266                 SkColorGetG(*pixel),
    267                 SkColorGetB(*pixel));
    268         }
    269     }
    270 }
    271 
    272 } // namespace blink
    273