WidgetBackingStoreGtkX11.cpp [plain text]
#include "config.h"
#include "WidgetBackingStoreGtkX11.h"
#include "CairoUtilities.h"
#include "GtkVersioning.h"
#include "RefPtrCairo.h"
#include <cairo-xlib.h>
#include <cairo.h>
#include <gdk/gdkx.h>
namespace WebCore {
PassOwnPtr<WidgetBackingStore> WidgetBackingStoreGtkX11::create(GtkWidget* widget, const IntSize& size, float deviceScaleFactor)
{
return adoptPtr(new WidgetBackingStoreGtkX11(widget, size, deviceScaleFactor));
}
WidgetBackingStoreGtkX11::WidgetBackingStoreGtkX11(GtkWidget* widget, const IntSize& size, float deviceScaleFactor)
: WidgetBackingStore(size, deviceScaleFactor)
{
IntSize scaledSize = size;
scaledSize.scale(deviceScaleFactor);
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)),
scaledSize.width(), scaledSize.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), scaledSize.width(), scaledSize.height()));
cairoSurfaceSetDeviceScale(m_surface.get(), deviceScaleFactor, deviceScaleFactor);
}
WidgetBackingStoreGtkX11::~WidgetBackingStoreGtkX11()
{
m_surface.clear();
XFreePixmap(m_display, m_pixmap);
XFreeGC(m_display, m_gc);
}
cairo_surface_t* WidgetBackingStoreGtkX11::cairoSurface()
{
return m_surface.get();
}
void WidgetBackingStoreGtkX11::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
{
IntRect targetRect(scrollRect);
targetRect.move(scrollOffset);
targetRect.intersect(scrollRect);
if (targetRect.isEmpty())
return;
targetRect.scale(m_deviceScaleFactor);
IntSize scaledScrollOffset = scrollOffset;
scaledScrollOffset.scale(m_deviceScaleFactor);
cairo_surface_flush(m_surface.get());
XCopyArea(m_display, m_pixmap, m_pixmap, m_gc,
targetRect.x() - scaledScrollOffset.width(), targetRect.y() - scaledScrollOffset.height(),
targetRect.width(), targetRect.height(),
targetRect.x(), targetRect.y());
cairo_surface_mark_dirty_rectangle(m_surface.get(),
targetRect.x(), targetRect.y(),
targetRect.width(), targetRect.height());
}
}