1 /*
2 * Copyright (C) 2007, 2008 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 "DragImage.h"
28
29 #include "CachedImage.h"
30 #include "Font.h"
31 #include "FontDescription.h"
32 #include "FontSelector.h"
33 #include "Frame.h"
34 #include "GraphicsContext.h"
35 #include "Image.h"
36 #include "RetainPtr.h"
37 #include "Settings.h"
38 #include "StringTruncator.h"
39 #include "TextRun.h"
40 #include "WebCoreTextRenderer.h"
41
42 #include <windows.h>
43
44 namespace WebCore {
45
46 HBITMAP allocImage(HDC, IntSize, PlatformGraphicsContext** targetRef);
47 void deallocContext(PlatformGraphicsContext* target);
48
dragImageSize(DragImageRef image)49 IntSize dragImageSize(DragImageRef image)
50 {
51 if (!image)
52 return IntSize();
53 BITMAP b;
54 GetObject(image, sizeof(BITMAP), &b);
55 return IntSize(b.bmWidth, b.bmHeight);
56 }
57
deleteDragImage(DragImageRef image)58 void deleteDragImage(DragImageRef image)
59 {
60 if (image)
61 ::DeleteObject(image);
62 }
63
dissolveDragImageToFraction(DragImageRef image,float)64 DragImageRef dissolveDragImageToFraction(DragImageRef image, float)
65 {
66 //We don't do this on windows as the dragimage is blended by the OS
67 return image;
68 }
69
createDragImageIconForCachedImage(CachedImage * image)70 DragImageRef createDragImageIconForCachedImage(CachedImage* image)
71 {
72 if (!image)
73 return 0;
74
75 String filename = image->response().suggestedFilename();
76
77 SHFILEINFO shfi = {0};
78 if (FAILED(SHGetFileInfo(static_cast<LPCWSTR>(filename.charactersWithNullTermination()), FILE_ATTRIBUTE_NORMAL,
79 &shfi, sizeof(shfi), SHGFI_ICON | SHGFI_USEFILEATTRIBUTES)))
80 return 0;
81
82 ICONINFO iconInfo;
83 if (!GetIconInfo(shfi.hIcon, &iconInfo)) {
84 DestroyIcon(shfi.hIcon);
85 return 0;
86 }
87
88 DestroyIcon(shfi.hIcon);
89 DeleteObject(iconInfo.hbmMask);
90
91 return iconInfo.hbmColor;
92 }
93
94 const float DragLabelBorderX = 4;
95 // Keep border_y in synch with DragController::LinkDragBorderInset.
96 const float DragLabelBorderY = 2;
97 const float DragLabelRadius = 5;
98 const float LabelBorderYOffset = 2;
99
100 const float MinDragLabelWidthBeforeClip = 120;
101 const float MaxDragLabelWidth = 200;
102 const float MaxDragLabelStringWidth = (MaxDragLabelWidth - 2 * DragLabelBorderX);
103
104 const float DragLinkLabelFontsize = 11;
105 const float DragLinkUrlFontSize = 10;
106
dragLabelFont(int size,bool bold,FontRenderingMode renderingMode)107 static Font dragLabelFont(int size, bool bold, FontRenderingMode renderingMode)
108 {
109 NONCLIENTMETRICS metrics;
110 metrics.cbSize = sizeof(metrics);
111 SystemParametersInfo(SPI_GETNONCLIENTMETRICS, metrics.cbSize, &metrics, 0);
112
113 FontDescription description;
114 description.setWeight(bold ? FontWeightBold : FontWeightNormal);
115
116 FontFamily family;
117 family.setFamily(metrics.lfSmCaptionFont.lfFaceName);
118 description.setFamily(family);
119 description.setSpecifiedSize((float)size);
120 description.setComputedSize((float)size);
121 description.setRenderingMode(renderingMode);
122 Font result = Font(description, 0, 0);
123 result.update(0);
124 return result;
125 }
126
createDragImageForLink(KURL & url,const String & inLabel,Frame * frame)127 DragImageRef createDragImageForLink(KURL& url, const String& inLabel, Frame* frame)
128 {
129 // This is more or less an exact match for the Mac OS X code.
130
131 const Font* labelFont;
132 const Font* urlFont;
133
134 if (frame->settings() && frame->settings()->fontRenderingMode() == AlternateRenderingMode) {
135 static const Font alternateRenderingModeLabelFont = dragLabelFont(DragLinkLabelFontsize, true, AlternateRenderingMode);
136 static const Font alternateRenderingModeURLFont = dragLabelFont(DragLinkUrlFontSize, false, AlternateRenderingMode);
137 labelFont = &alternateRenderingModeLabelFont;
138 urlFont = &alternateRenderingModeURLFont;
139 } else {
140 static const Font normalRenderingModeLabelFont = dragLabelFont(DragLinkLabelFontsize, true, NormalRenderingMode);
141 static const Font normalRenderingModeURLFont = dragLabelFont(DragLinkUrlFontSize, false, NormalRenderingMode);
142 labelFont = &normalRenderingModeLabelFont;
143 urlFont = &normalRenderingModeURLFont;
144 }
145
146 bool drawURLString = true;
147 bool clipURLString = false;
148 bool clipLabelString = false;
149
150 String urlString = url.string();
151 String label = inLabel;
152 if (label.isEmpty()) {
153 drawURLString = false;
154 label = urlString;
155 }
156
157 // First step in drawing the link drag image width.
158 TextRun labelRun(label.impl());
159 TextRun urlRun(urlString.impl());
160 IntSize labelSize(labelFont->width(labelRun), labelFont->fontMetrics().ascent() + labelFont->fontMetrics().descent());
161
162 if (labelSize.width() > MaxDragLabelStringWidth) {
163 labelSize.setWidth(MaxDragLabelStringWidth);
164 clipLabelString = true;
165 }
166
167 IntSize urlStringSize;
168 IntSize imageSize(labelSize.width() + DragLabelBorderX * 2, labelSize.height() + DragLabelBorderY * 2);
169
170 if (drawURLString) {
171 urlStringSize.setWidth(urlFont->width(urlRun));
172 urlStringSize.setHeight(urlFont->fontMetrics().ascent() + urlFont->fontMetrics().descent());
173 imageSize.setHeight(imageSize.height() + urlStringSize.height());
174 if (urlStringSize.width() > MaxDragLabelStringWidth) {
175 imageSize.setWidth(MaxDragLabelWidth);
176 clipURLString = true;
177 } else
178 imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + DragLabelBorderX * 2);
179 }
180
181 // We now know how big the image needs to be, so we create and
182 // fill the background
183 HBITMAP image = 0;
184 HDC dc = GetDC(0);
185 HDC workingDC = CreateCompatibleDC(dc);
186 if (!workingDC) {
187 ReleaseDC(0, dc);
188 return 0;
189 }
190
191 PlatformGraphicsContext* contextRef;
192 image = allocImage(workingDC, imageSize, &contextRef);
193 if (!image) {
194 DeleteDC(workingDC);
195 ReleaseDC(0, dc);
196 return 0;
197 }
198
199 SelectObject(workingDC, image);
200 GraphicsContext context(contextRef);
201 // On Mac alpha is {0.7, 0.7, 0.7, 0.8}, however we can't control alpha
202 // for drag images on win, so we use 1
203 static const Color backgroundColor(140, 140, 140);
204 static const IntSize radii(DragLabelRadius, DragLabelRadius);
205 IntRect rect(0, 0, imageSize.width(), imageSize.height());
206 context.fillRoundedRect(rect, radii, radii, radii, radii, backgroundColor, ColorSpaceDeviceRGB);
207
208 // Draw the text
209 static const Color topColor(0, 0, 0, 255); // original alpha = 0.75
210 static const Color bottomColor(255, 255, 255, 127); // original alpha = 0.5
211 if (drawURLString) {
212 if (clipURLString)
213 urlString = StringTruncator::rightTruncate(urlString, imageSize.width() - (DragLabelBorderX * 2.0f), *urlFont);
214 IntPoint textPos(DragLabelBorderX, imageSize.height() - (LabelBorderYOffset + urlFont->fontMetrics().descent()));
215 WebCoreDrawDoubledTextAtPoint(context, urlString, textPos, *urlFont, topColor, bottomColor);
216 }
217
218 if (clipLabelString)
219 label = StringTruncator::rightTruncate(label, imageSize.width() - (DragLabelBorderX * 2.0f), *labelFont);
220
221 IntPoint textPos(DragLabelBorderX, DragLabelBorderY + labelFont->pixelSize());
222 WebCoreDrawDoubledTextAtPoint(context, label, textPos, *labelFont, topColor, bottomColor);
223
224 deallocContext(contextRef);
225 DeleteDC(workingDC);
226 ReleaseDC(0, dc);
227 return image;
228 }
229
230 }
231