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