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
56namespace blink {
57
58const float kDragLabelBorderX = 4;
59// Keep border_y in synch with DragController::LinkDragBorderInset.
60const float kDragLabelBorderY = 2;
61const float kLabelBorderYOffset = 2;
62
63const float kMaxDragLabelWidth = 300;
64const float kMaxDragLabelStringWidth = (kMaxDragLabelWidth - 2 * kDragLabelBorderX);
65
66const float kDragLinkLabelFontSize = 11;
67const float kDragLinkUrlFontSize = 10;
68
69PassOwnPtr<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
109static 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
120PassOwnPtr<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
202DragImage::DragImage(const SkBitmap& bitmap, float resolutionScale)
203    : m_bitmap(bitmap)
204    , m_resolutionScale(resolutionScale)
205{
206}
207
208DragImage::~DragImage()
209{
210}
211
212void 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
247void 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
255void 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