1/*
2 * Copyright (C) 2006, 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 "FrameWin.h"
28
29#include <windows.h>
30
31#include "BitmapInfo.h"
32#include "FrameView.h"
33#include "GraphicsContext.h"
34#include "Settings.h"
35
36#include <CoreGraphics/CoreGraphics.h>
37
38using std::min;
39
40namespace WebCore {
41
42static void drawRectIntoContext(IntRect rect, FrameView* view, GraphicsContext* gc)
43{
44    IntSize offset = view->scrollOffset();
45    rect.move(-offset.width(), -offset.height());
46    rect = view->convertToContainingWindow(rect);
47
48    gc->concatCTM(AffineTransform().translate(-rect.x(), -rect.y()));
49
50    view->paint(gc, rect);
51}
52
53static HBITMAP imageFromRect(const Frame* frame, IntRect& ir)
54{
55    PaintBehavior oldPaintBehavior = frame->view()->paintBehavior();
56    frame->view()->setPaintBehavior(oldPaintBehavior | PaintBehaviorFlattenCompositingLayers);
57
58    void* bits;
59    HDC hdc = CreateCompatibleDC(0);
60    int w = ir.width();
61    int h = ir.height();
62    BitmapInfo bmp = BitmapInfo::create(IntSize(w, h));
63
64    HBITMAP hbmp = CreateDIBSection(0, &bmp, DIB_RGB_COLORS, static_cast<void**>(&bits), 0, 0);
65    HBITMAP hbmpOld = static_cast<HBITMAP>(SelectObject(hdc, hbmp));
66    CGColorSpaceRef deviceRGB = CGColorSpaceCreateDeviceRGB();
67    CGContextRef context = CGBitmapContextCreate(static_cast<void*>(bits), w, h,
68        8, w * sizeof(RGBQUAD), deviceRGB, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
69    CGColorSpaceRelease(deviceRGB);
70    CGContextSaveGState(context);
71
72    GraphicsContext gc(context);
73
74    drawRectIntoContext(ir, frame->view(), &gc);
75
76    CGContextRelease(context);
77    SelectObject(hdc, hbmpOld);
78    DeleteDC(hdc);
79
80    frame->view()->setPaintBehavior(oldPaintBehavior);
81
82    return hbmp;
83}
84
85HBITMAP imageFromSelection(Frame* frame, bool forceBlackText)
86{
87    frame->document()->updateLayout();
88
89    frame->view()->setPaintBehavior(PaintBehaviorSelectionOnly | (forceBlackText ? PaintBehaviorForceBlackText : 0));
90    FloatRect fr = frame->selectionBounds();
91    IntRect ir(static_cast<int>(fr.x()), static_cast<int>(fr.y()),
92               static_cast<int>(fr.width()), static_cast<int>(fr.height()));
93    HBITMAP image = imageFromRect(frame, ir);
94    frame->view()->setPaintBehavior(PaintBehaviorNormal);
95    return image;
96}
97
98HBITMAP Frame::nodeImage(Node* node) const
99{
100    RenderObject* renderer = node->renderer();
101    if (!renderer)
102        return 0;
103
104    IntRect topLevelRect;
105    IntRect paintingRect = renderer->paintingRootRect(topLevelRect);
106
107    document()->updateLayout();
108
109    m_view->setNodeToDraw(node); // invoke special sub-tree drawing mode
110    HBITMAP result = imageFromRect(this, paintingRect);
111    m_view->setNodeToDraw(0);
112
113    return result;
114}
115
116} // namespace WebCore
117