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      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 
     38 using std::min;
     39 
     40 namespace WebCore {
     41 
     42 static 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 
     53 static 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 
     85 HBITMAP 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 
     98 HBITMAP 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