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
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 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
94const float DragLabelBorderX = 4;
95// Keep border_y in synch with DragController::LinkDragBorderInset.
96const float DragLabelBorderY = 2;
97const float DragLabelRadius = 5;
98const float LabelBorderYOffset = 2;
99
100const float MinDragLabelWidthBeforeClip = 120;
101const float MaxDragLabelWidth = 200;
102const float MaxDragLabelStringWidth = (MaxDragLabelWidth - 2 * DragLabelBorderX);
103
104const float DragLinkLabelFontsize = 11;
105const float DragLinkUrlFontSize = 10;
106
107static 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
127DragImageRef 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