ChunkedUpdateDrawingAreaProxyMac.mm revision 65f03d4f644ce73618e5f4f50dd694b26f55ae12 
1/*
2 * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "ChunkedUpdateDrawingAreaProxy.h"
27
28#include "DrawingAreaMessageKinds.h"
29#include "DrawingAreaProxyMessageKinds.h"
30#include "UpdateChunk.h"
31#include "WKAPICast.h"
32#include "WKView.h"
33#include "WebPageProxy.h"
34
35using namespace WebCore;
36
37namespace WebKit {
38
39WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
40{
41    return toImpl([m_webView pageRef]);
42}
43
44void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
45{
46    if (m_bitmapContext)
47        return;
48
49    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
50    const IntSize& viewSize = size();
51    m_bitmapContext.adoptCF(CGBitmapContextCreate(0, viewSize.width(), viewSize.height(), 8, viewSize.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
52
53    // Flip the bitmap context coordinate system.
54    CGContextTranslateCTM(m_bitmapContext.get(), 0, viewSize.height());
55    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
56}
57
58void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
59{
60    m_bitmapContext = 0;
61}
62
63bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, CGContextRef context)
64{
65    if (!m_bitmapContext)
66        return false;
67
68    CGContextSaveGState(context);
69
70    // Use the copy blend mode when drawing a background.
71    if (page()->drawsBackground())
72        CGContextSetBlendMode(context, kCGBlendModeCopy);
73
74    // Flip the destination.
75    CGContextScaleCTM(context, 1, -1);
76    CGContextTranslateCTM(context, 0, -m_size.height());
77
78    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(m_bitmapContext.get()));
79    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());
80
81    CGContextRestoreGState(context);
82    return true;
83}
84
85void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
86{
87    ensureBackingStore();
88
89    RetainPtr<CGImageRef> image(updateChunk->createImage());
90    IntRect updateChunkRect = updateChunk->rect();
91
92    CGContextSaveGState(m_bitmapContext.get());
93
94    // Use the copy blend mode to replace existing content.
95    CGContextSetBlendMode(m_bitmapContext.get(), kCGBlendModeCopy);
96
97    // Flip the destination.
98    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
99    CGContextTranslateCTM(m_bitmapContext.get(), 0, -(updateChunkRect.y() + updateChunkRect.bottom()));
100
101    CGContextDrawImage(m_bitmapContext.get(), updateChunkRect, image.get());
102
103    CGContextRestoreGState(m_bitmapContext.get());
104
105    [m_webView setNeedsDisplayInRect:NSRectFromCGRect(updateChunkRect)];
106}
107
108} // namespace WebKit
109