GtkWidgetBackingStoreCairo.cpp [plain text]
#include "config.h"
#include "GtkWidgetBackingStore.h"
#ifndef XP_UNIX
#include "RefPtrCairo.h"
#include <cairo/cairo.h>
#include <gtk/gtk.h>
namespace WebCore {
static PassRefPtr<cairo_surface_t> createSurfaceForBackingStore(GtkWidget* widget, const IntSize& size)
{
return gdk_window_create_similar_surface(gtk_widget_get_window(widget),
CAIRO_CONTENT_COLOR_ALPHA,
size.width(), size.height());
}
class GtkWidgetBackingStorePrivate {
WTF_MAKE_NONCOPYABLE(GtkWidgetBackingStorePrivate); WTF_MAKE_FAST_ALLOCATED;
public:
RefPtr<cairo_surface_t> m_surface;
RefPtr<cairo_surface_t> m_scrollSurface;
static PassOwnPtr<GtkWidgetBackingStorePrivate> create(GtkWidget* widget, const IntSize& size)
{
return adoptPtr(new GtkWidgetBackingStorePrivate(widget, size));
}
private:
GtkWidgetBackingStorePrivate(GtkWidget* widget, const IntSize& size)
: m_surface(createSurfaceForBackingStore(widget, size))
, m_scrollSurface(createSurfaceForBackingStore(widget, size))
{
}
};
PassOwnPtr<GtkWidgetBackingStore> GtkWidgetBackingStore::create(GtkWidget* widget, const IntSize& size)
{
return adoptPtr(new GtkWidgetBackingStore(widget, size));
}
GtkWidgetBackingStore::GtkWidgetBackingStore(GtkWidget* widget, const IntSize& size)
: m_private(GtkWidgetBackingStorePrivate::create(widget, size))
{
}
GtkWidgetBackingStore::~GtkWidgetBackingStore()
{
}
cairo_surface_t* GtkWidgetBackingStore::cairoSurface()
{
return m_private->m_surface.get();
}
static void copyRectFromOneSurfaceToAnother(cairo_surface_t* from, cairo_surface_t* to, const IntSize& offset, const IntRect& rect)
{
RefPtr<cairo_t> context = adoptRef(cairo_create(to));
cairo_set_source_surface(context.get(), from, offset.width(), offset.height());
cairo_rectangle(context.get(), rect.x(), rect.y(), rect.width(), rect.height());
cairo_fill(context.get());
}
void GtkWidgetBackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
{
IntRect targetRect(scrollRect);
targetRect.move(scrollOffset);
targetRect.shiftMaxXEdgeTo(targetRect.maxX() - scrollOffset.width());
targetRect.shiftMaxYEdgeTo(targetRect.maxY() - scrollOffset.height());
if (targetRect.isEmpty())
return;
copyRectFromOneSurfaceToAnother(m_private->m_surface.get(), m_private->m_scrollSurface.get(),
scrollOffset, targetRect);
copyRectFromOneSurfaceToAnother(m_private->m_scrollSurface.get(), m_private->m_surface.get(),
IntSize(), targetRect);
}
}
#endif // !XP_UNIX