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/*
* Copyright (C) 2011, Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "WidgetBackingStore.h"
#include "GtkVersioning.h"
#include "RefPtrCairo.h"
#include <X11/Xlib.h>
#include <cairo-xlib.h>
#include <cairo.h>
#include <gdk/gdkx.h>
namespace WebCore {
class WidgetBackingStorePrivate {
WTF_MAKE_NONCOPYABLE(WidgetBackingStorePrivate);
WTF_MAKE_FAST_ALLOCATED;
public:
Display* m_display;
Pixmap m_pixmap;
GC m_gc;
RefPtr<cairo_surface_t> m_surface;
static PassOwnPtr<WidgetBackingStorePrivate> create(GtkWidget* widget, const IntSize& size)
{
return adoptPtr(new WidgetBackingStorePrivate(widget, size));
}
~WidgetBackingStorePrivate()
{
XFreePixmap(m_display, m_pixmap);
XFreeGC(m_display, m_gc);
}
private:
// We keep two copies of the surface here, which will double the memory usage, but increase
// scrolling performance since we do not have to keep reallocating a memory region during
// quick scrolling requests.
WidgetBackingStorePrivate(GtkWidget* widget, const IntSize& size)
{
GdkVisual* visual = gtk_widget_get_visual(widget);
GdkScreen* screen = gdk_visual_get_screen(visual);
m_display = GDK_SCREEN_XDISPLAY(screen);
m_pixmap = XCreatePixmap(m_display,
GDK_WINDOW_XID(gdk_screen_get_root_window(screen)),
size.width(), size.height(),
gdk_visual_get_depth(visual));
m_gc = XCreateGC(m_display, m_pixmap, 0, 0);
m_surface = adoptRef(cairo_xlib_surface_create(m_display, m_pixmap,
GDK_VISUAL_XVISUAL(visual),
size.width(), size.height()));
}
};
PassOwnPtr<WidgetBackingStore> WidgetBackingStore::create(GtkWidget* widget, const IntSize& size)
{
return adoptPtr(new WidgetBackingStore(widget, size));
}
WidgetBackingStore::WidgetBackingStore(GtkWidget* widget, const IntSize& size)
: m_private(WidgetBackingStorePrivate::create(widget, size))
, m_size(size)
{
}
WidgetBackingStore::~WidgetBackingStore()
{
}
cairo_surface_t* WidgetBackingStore::cairoSurface()
{
return m_private->m_surface.get();
}
void WidgetBackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
{
IntRect targetRect(scrollRect);
targetRect.move(scrollOffset);
targetRect.intersect(scrollRect);
if (targetRect.isEmpty())
return;
cairo_surface_flush(m_private->m_surface.get());
XCopyArea(m_private->m_display, m_private->m_pixmap, m_private->m_pixmap, m_private->m_gc,
targetRect.x() - scrollOffset.width(), targetRect.y() - scrollOffset.height(),
targetRect.width(), targetRect.height(),
targetRect.x(), targetRect.y());
cairo_surface_mark_dirty_rectangle(m_private->m_surface.get(),
targetRect.x(), targetRect.y(),
targetRect.width(), targetRect.height());
}
} // namespace WebCore
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