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/* GDK - The GIMP Drawing Kit
*
* gdkcairocontext.c: Cairo wrappers
*
* Copyright © 2018 Benjamin Otte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdkcairocontext.h"
#include "gdkcairocontextprivate.h"
#include "gdkcairo.h"
#include "gdkinternals.h"
/**
* SECTION:gdkcairocontext
* @Title: GdkCairoContext
* @Short_description: Cairo draw context
*
* #GdkCairoContext is an object representing the platform-specific
* draw context.
*
* #GdkCairoContexts are created for a #GdkDisplay using
* gdk_surface_create_cairo_context(), and the context can then be used
* to draw on that #GdkSurface.
*/
/**
* GdkCairoContext:
*
* The GdkCairoContext struct contains only private fields and should not
* be accessed directly.
*/
typedef struct _GdkCairoContextPrivate GdkCairoContextPrivate;
struct _GdkCairoContextPrivate {
gpointer unused;
};
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GdkCairoContext, gdk_cairo_context, GDK_TYPE_DRAW_CONTEXT,
G_ADD_PRIVATE (GdkCairoContext))
static void
gdk_cairo_context_class_init (GdkCairoContextClass *klass)
{
}
static void
gdk_cairo_context_init (GdkCairoContext *self)
{
}
/**
* gdk_cairo_context_cairo_create:
* @self: a #GdkCairoContext that is currently drawing
*
* Retrieves a Cairo context to be used to draw on the #GdkSurface
* of @context. A call to gdk_draw_context_begin_frame() with this
* @context must have been done or this function will return %NULL.
*
* The returned context is guaranteed to be valid until
* gdk_draw_context_end_frame() is called.
*
* Returns: (transfer full) (nullable): a Cairo context to be used
* to draw the contents of the #GdkSurface. %NULL is returned
* when @context is not drawing.
*/
cairo_t *
gdk_cairo_context_cairo_create (GdkCairoContext *self)
{
GdkDrawContext *draw_context;
cairo_t *cr;
g_return_val_if_fail (GDK_IS_CAIRO_CONTEXT (self), NULL);
draw_context = GDK_DRAW_CONTEXT (self);
if (!gdk_draw_context_is_in_frame (draw_context))
return NULL;
cr = GDK_CAIRO_CONTEXT_GET_CLASS (self)->cairo_create (self);
gdk_cairo_region (cr, gdk_draw_context_get_frame_region (draw_context));
cairo_clip (cr);
return cr;
}
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