1/*
2 * Copyright (C) 2007, 2008, 2013 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 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 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 "FloatRoundedRect.h"
30#include "Font.h"
31#include "FontCache.h"
32#include "FontDescription.h"
33#include "FontSelector.h"
34#include "GraphicsContext.h"
35#include "HWndDC.h"
36#include "Image.h"
37#include "URL.h"
38#include "StringTruncator.h"
39#include "TextRun.h"
40#include "WebCoreTextRenderer.h"
41#include <wtf/RetainPtr.h>
42#include <wtf/win/GDIObject.h>
43
44#include <windows.h>
45
46namespace WebCore {
47
48GDIObject<HBITMAP> allocImage(HDC, IntSize, PlatformGraphicsContext** targetRef);
49void deallocContext(PlatformGraphicsContext* target);
50
51IntSize dragImageSize(DragImageRef image)
52{
53    if (!image)
54        return IntSize();
55    BITMAP b;
56    GetObject(image, sizeof(BITMAP), &b);
57    return IntSize(b.bmWidth, b.bmHeight);
58}
59
60void deleteDragImage(DragImageRef image)
61{
62    if (image)
63        ::DeleteObject(image);
64}
65
66DragImageRef dissolveDragImageToFraction(DragImageRef image, float)
67{
68    //We don't do this on windows as the dragimage is blended by the OS
69    return image;
70}
71
72DragImageRef createDragImageIconForCachedImageFilename(const String& filename)
73{
74    SHFILEINFO shfi = {0};
75    String fname = filename;
76    if (FAILED(SHGetFileInfo(static_cast<LPCWSTR>(fname.charactersWithNullTermination().data()), FILE_ATTRIBUTE_NORMAL,
77        &shfi, sizeof(shfi), SHGFI_ICON | SHGFI_USEFILEATTRIBUTES)))
78        return 0;
79
80    ICONINFO iconInfo;
81    if (!GetIconInfo(shfi.hIcon, &iconInfo)) {
82        DestroyIcon(shfi.hIcon);
83        return 0;
84    }
85
86    DestroyIcon(shfi.hIcon);
87    DeleteObject(iconInfo.hbmMask);
88
89    return iconInfo.hbmColor;
90}
91
92const float DragLabelBorderX = 4;
93// Keep border_y in synch with DragController::LinkDragBorderInset.
94const float DragLabelBorderY = 2;
95const float DragLabelRadius = 5;
96const float LabelBorderYOffset = 2;
97
98const float MinDragLabelWidthBeforeClip = 120;
99const float MaxDragLabelWidth = 200;
100const float MaxDragLabelStringWidth = (MaxDragLabelWidth - 2 * DragLabelBorderX);
101
102const float DragLinkLabelFontsize = 11;
103const float DragLinkUrlFontSize = 10;
104
105static Font dragLabelFont(int size, bool bold, FontRenderingMode renderingMode)
106{
107    Font result;
108#if !OS(WINCE)
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    description.setOneFamily(metrics.lfSmCaptionFont.lfFaceName);
116    description.setSpecifiedSize((float)size);
117    description.setComputedSize((float)size);
118    description.setRenderingMode(renderingMode);
119    result = Font(description, 0, 0);
120    result.update(0);
121#endif
122    return result;
123}
124
125DragImageRef createDragImageForLink(URL& url, const String& inLabel, FontRenderingMode fontRenderingMode)
126{
127    // This is more or less an exact match for the Mac OS X code.
128
129    const Font* labelFont;
130    const Font* urlFont;
131    FontCachePurgePreventer fontCachePurgePreventer;
132
133    if (fontRenderingMode == AlternateRenderingMode) {
134        static const Font alternateRenderingModeLabelFont = dragLabelFont(DragLinkLabelFontsize, true, AlternateRenderingMode);
135        static const Font alternateRenderingModeURLFont = dragLabelFont(DragLinkUrlFontSize, false, AlternateRenderingMode);
136        labelFont = &alternateRenderingModeLabelFont;
137        urlFont = &alternateRenderingModeURLFont;
138    } else {
139        static const Font normalRenderingModeLabelFont = dragLabelFont(DragLinkLabelFontsize, true, NormalRenderingMode);
140        static const Font normalRenderingModeURLFont = dragLabelFont(DragLinkUrlFontSize, false, NormalRenderingMode);
141        labelFont = &normalRenderingModeLabelFont;
142        urlFont = &normalRenderingModeURLFont;
143    }
144
145    bool drawURLString = true;
146    bool clipURLString = false;
147    bool clipLabelString = false;
148
149    String urlString = url.string();
150    String label = inLabel;
151    if (label.isEmpty()) {
152        drawURLString = false;
153        label = urlString;
154    }
155
156    // First step in drawing the link drag image width.
157    TextRun labelRun(label.impl());
158    TextRun urlRun(urlString.impl());
159    IntSize labelSize(labelFont->width(labelRun), labelFont->fontMetrics().ascent() + labelFont->fontMetrics().descent());
160
161    if (labelSize.width() > MaxDragLabelStringWidth) {
162        labelSize.setWidth(MaxDragLabelStringWidth);
163        clipLabelString = true;
164    }
165
166    IntSize urlStringSize;
167    IntSize imageSize(labelSize.width() + DragLabelBorderX * 2, labelSize.height() + DragLabelBorderY * 2);
168
169    if (drawURLString) {
170        urlStringSize.setWidth(urlFont->width(urlRun));
171        urlStringSize.setHeight(urlFont->fontMetrics().ascent() + urlFont->fontMetrics().descent());
172        imageSize.setHeight(imageSize.height() + urlStringSize.height());
173        if (urlStringSize.width() > MaxDragLabelStringWidth) {
174            imageSize.setWidth(MaxDragLabelWidth);
175            clipURLString = true;
176        } else
177            imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + DragLabelBorderX * 2);
178    }
179
180    // We now know how big the image needs to be, so we create and
181    // fill the background
182    HWndDC dc(0);
183    auto workingDC = adoptGDIObject(::CreateCompatibleDC(dc));
184    if (!workingDC)
185        return 0;
186
187    PlatformGraphicsContext* contextRef;
188    auto image = allocImage(workingDC.get(), imageSize, &contextRef);
189    if (!image)
190        return 0;
191
192    ::SelectObject(workingDC.get(), image.get());
193    GraphicsContext context(contextRef);
194    // On Mac alpha is {0.7, 0.7, 0.7, 0.8}, however we can't control alpha
195    // for drag images on win, so we use 1
196    static const Color backgroundColor(140, 140, 140);
197    static const IntSize radii(DragLabelRadius, DragLabelRadius);
198    IntRect rect(0, 0, imageSize.width(), imageSize.height());
199    context.fillRoundedRect(FloatRoundedRect(rect, radii, radii, radii, radii), backgroundColor, ColorSpaceDeviceRGB);
200
201    // Draw the text
202    static const Color topColor(0, 0, 0, 255); // original alpha = 0.75
203    static const Color bottomColor(255, 255, 255, 127); // original alpha = 0.5
204    if (drawURLString) {
205        if (clipURLString)
206            urlString = StringTruncator::rightTruncate(urlString, imageSize.width() - (DragLabelBorderX * 2.0f), *urlFont, StringTruncator::EnableRoundingHacks);
207        IntPoint textPos(DragLabelBorderX, imageSize.height() - (LabelBorderYOffset + urlFont->fontMetrics().descent()));
208        WebCoreDrawDoubledTextAtPoint(context, urlString, textPos, *urlFont, topColor, bottomColor);
209    }
210
211    if (clipLabelString)
212        label = StringTruncator::rightTruncate(label, imageSize.width() - (DragLabelBorderX * 2.0f), *labelFont, StringTruncator::EnableRoundingHacks);
213
214    IntPoint textPos(DragLabelBorderX, DragLabelBorderY + labelFont->pixelSize());
215    WebCoreDrawDoubledTextAtPoint(context, label, textPos, *labelFont, topColor, bottomColor);
216
217    deallocContext(contextRef);
218    return image.leak();
219}
220
221}
222