WidgetBackingStoreCairo.cpp [plain text]
#include "config.h"
#include "WidgetBackingStoreCairo.h"
#include "CairoUtilities.h"
#include "RefPtrCairo.h"
#include <cairo.h>
namespace WebCore {
static PassRefPtr<cairo_surface_t> createSurfaceForBackingStore(PlatformWidget widget, IntSize size, float deviceScaleFactor)
{
size.scale(deviceScaleFactor);
#if PLATFORM(GTK)
return adoptRef(gdk_window_create_similar_surface(gtk_widget_get_window(widget), CAIRO_CONTENT_COLOR_ALPHA, size.width(), size.height()));
#else
UNUSED_PARAM(widget);
return adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, size.width(), size.height()));
#endif
}
PassOwnPtr<WidgetBackingStore> WidgetBackingStoreCairo::create(PlatformWidget widget, const IntSize& size, float deviceScaleFactor)
{
return adoptPtr(new WidgetBackingStoreCairo(widget, size, deviceScaleFactor));
}
WidgetBackingStoreCairo::WidgetBackingStoreCairo(PlatformWidget widget, const IntSize& size, float deviceScaleFactor)
: WidgetBackingStore(size, deviceScaleFactor)
, m_surface(createSurfaceForBackingStore(widget, size, deviceScaleFactor))
, m_scrollSurface(createSurfaceForBackingStore(widget, size, deviceScaleFactor))
{
cairoSurfaceSetDeviceScale(m_surface.get(), deviceScaleFactor, deviceScaleFactor);
}
WidgetBackingStoreCairo::~WidgetBackingStoreCairo()
{
}
cairo_surface_t* WidgetBackingStoreCairo::cairoSurface()
{
return m_surface.get();
}
void WidgetBackingStoreCairo::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_surface.get(), m_scrollSurface.get(),
scrollOffset, targetRect);
copyRectFromOneSurfaceToAnother(m_scrollSurface.get(), m_surface.get(),
IntSize(), targetRect);
}
}