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
create(Image * image,RespectImageOrientationEnum shouldRespectImageOrientation,float deviceScaleFactor)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
deriveDragLabelFont(int size,FontWeight fontWeight,const FontDescription & systemFont)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
create(const KURL & url,const String & inLabel,const FontDescription & systemFont,float deviceScaleFactor)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
DragImage(const SkBitmap & bitmap,float resolutionScale)197 DragImage::DragImage(const SkBitmap& bitmap, float resolutionScale)
198 : m_bitmap(bitmap)
199 , m_resolutionScale(resolutionScale)
200 {
201 }
202
~DragImage()203 DragImage::~DragImage()
204 {
205 }
206
fitToMaxSize(const IntSize & srcSize,const IntSize & maxSize)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
scale(float scaleX,float scaleY)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
dissolveToFraction(float fraction)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