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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  * Portions Copyright (c) 2010 Motorola Mobility, Inc.  All rights reserved.
      4  * Copyright (C) 2011 Igalia S.L
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     17  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     19  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     25  * THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "config.h"
     29 #include "ChunkedUpdateDrawingAreaProxy.h"
     30 
     31 #include "RefPtrCairo.h"
     32 #include "UpdateChunk.h"
     33 #include "WebProcessProxy.h"
     34 #include "WebView.h"
     35 #include <WebCore/GtkVersioning.h>
     36 #include <gdk/gdk.h>
     37 
     38 using namespace WebCore;
     39 
     40 namespace WebKit {
     41 
     42 WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
     43 {
     44     return m_webView->page();
     45 }
     46 
     47 void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
     48 {
     49     if (m_backingStoreImage)
     50         return;
     51 
     52     m_backingStoreImage = gdk_window_create_similar_surface(gtk_widget_get_window(m_webView->window()),
     53                                                             CAIRO_CONTENT_COLOR_ALPHA, size().width(), size().height());
     54 }
     55 
     56 void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
     57 {
     58     if (m_backingStoreImage) {
     59         cairo_surface_destroy(m_backingStoreImage);
     60         m_backingStoreImage = 0;
     61     }
     62 }
     63 
     64 bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, cairo_t* cr)
     65 {
     66     if (!m_backingStoreImage)
     67         return false;
     68 
     69     cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
     70     cairo_set_source_surface(cr, m_backingStoreImage, 0, 0);
     71     cairo_fill(cr);
     72 
     73     return true;
     74 }
     75 
     76 void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
     77 {
     78     ensureBackingStore();
     79 
     80     RefPtr<cairo_surface_t> pixmap(updateChunk->createImage());
     81     if (cairo_surface_status(pixmap.get()) != CAIRO_STATUS_SUCCESS)
     82         return;
     83 
     84     const IntRect& updateChunkRect = updateChunk->rect();
     85 
     86     RefPtr<cairo_t> cr = cairo_create(m_backingStoreImage);
     87     cairo_set_source_surface(cr.get(), pixmap.get(), updateChunkRect.x(), updateChunkRect.y());
     88     cairo_paint(cr.get());
     89 
     90     gtk_widget_queue_draw_area(m_webView->window(), updateChunkRect.x(), updateChunkRect.y(),
     91                                updateChunkRect.width(), updateChunkRect.height());
     92 }
     93 
     94 } // namespace WebKit
     95