Home | History | Annotate | Download | only in mac 
      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 #import "config.h"
     27 #import "ChunkedUpdateDrawingAreaProxy.h"
     28 
     29 #import "DrawingAreaMessageKinds.h"
     30 #import "DrawingAreaProxyMessageKinds.h"
     31 #import "UpdateChunk.h"
     32 #import "WKAPICast.h"
     33 #import "WKView.h"
     34 #import "WebPageProxy.h"
     35 
     36 using namespace WebCore;
     37 
     38 namespace WebKit {
     39 
     40 WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
     41 {
     42     return toImpl([m_webView pageRef]);
     43 }
     44 
     45 void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
     46 {
     47     if (m_bitmapContext)
     48         return;
     49 
     50     RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
     51     const IntSize& viewSize = size();
     52     m_bitmapContext.adoptCF(CGBitmapContextCreate(0, viewSize.width(), viewSize.height(), 8, viewSize.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
     53 
     54     // Flip the bitmap context coordinate system.
     55     CGContextTranslateCTM(m_bitmapContext.get(), 0, viewSize.height());
     56     CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
     57 }
     58 
     59 void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
     60 {
     61     m_bitmapContext = 0;
     62 }
     63 
     64 bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, CGContextRef context)
     65 {
     66     if (!m_bitmapContext)
     67         return false;
     68 
     69     CGContextSaveGState(context);
     70 
     71     // Use the copy blend mode when drawing a background.
     72     if (page()->drawsBackground())
     73         CGContextSetBlendMode(context, kCGBlendModeCopy);
     74 
     75     // Flip the destination.
     76     CGContextScaleCTM(context, 1, -1);
     77     CGContextTranslateCTM(context, 0, -m_size.height());
     78 
     79     RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(m_bitmapContext.get()));
     80     CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());
     81 
     82     CGContextRestoreGState(context);
     83     return true;
     84 }
     85 
     86 void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
     87 {
     88     ensureBackingStore();
     89 
     90     RetainPtr<CGImageRef> image(updateChunk->createImage());
     91     IntRect updateChunkRect = updateChunk->rect();
     92 
     93     CGContextSaveGState(m_bitmapContext.get());
     94 
     95     // Use the copy blend mode to replace existing content.
     96     CGContextSetBlendMode(m_bitmapContext.get(), kCGBlendModeCopy);
     97 
     98     // Flip the destination.
     99     CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
    100     CGContextTranslateCTM(m_bitmapContext.get(), 0, -(updateChunkRect.y() + updateChunkRect.maxY()));
    101 
    102     CGContextDrawImage(m_bitmapContext.get(), updateChunkRect, image.get());
    103 
    104     CGContextRestoreGState(m_bitmapContext.get());
    105 
    106     [m_webView setNeedsDisplayInRect:NSRectFromCGRect(updateChunkRect)];
    107 }
    108 
    109 } // namespace WebKit
    110