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98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* gdkcairocontext.c: Cairo wrappers
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*
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* Copyright © 2018 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkcairocontext.h"
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#include "gdkcairocontextprivate.h"
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#include "gdkcairo.h"
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#include "gdkinternals.h"
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/**
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* GdkCairoContext:
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*
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* `GdkCairoContext` is an object representing the platform-specific
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* draw context.
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*
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* `GdkCairoContext`s are created for a surface using
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* [method@Gdk.Surface.create_cairo_context], and the context can then be used
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* to draw on that surface.
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*/
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typedef struct _GdkCairoContextPrivate GdkCairoContextPrivate;
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struct _GdkCairoContextPrivate {
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gpointer unused;
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};
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G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GdkCairoContext, gdk_cairo_context, GDK_TYPE_DRAW_CONTEXT,
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G_ADD_PRIVATE (GdkCairoContext))
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static void
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gdk_cairo_context_class_init (GdkCairoContextClass *klass)
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{
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}
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static void
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gdk_cairo_context_init (GdkCairoContext *self)
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{
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}
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/**
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* gdk_cairo_context_cairo_create:
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* @self: a #GdkCairoContext that is currently drawing
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*
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* Retrieves a Cairo context to be used to draw on the `GdkSurface`
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* of @context.
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*
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* A call to [method@Gdk.DrawContext.begin_frame] with this
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* @context must have been done or this function will return %NULL.
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*
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* The returned context is guaranteed to be valid until
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* [method@Gdk.DrawContext.end_frame] is called.
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*
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* Returns: (transfer full) (nullable): a Cairo context to be used
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* to draw the contents of the `GdkSurface`. %NULL is returned
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* when @context is not drawing.
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*/
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cairo_t *
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gdk_cairo_context_cairo_create (GdkCairoContext *self)
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{
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GdkDrawContext *draw_context;
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cairo_t *cr;
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g_return_val_if_fail (GDK_IS_CAIRO_CONTEXT (self), NULL);
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draw_context = GDK_DRAW_CONTEXT (self);
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if (!gdk_draw_context_is_in_frame (draw_context))
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return NULL;
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cr = GDK_CAIRO_CONTEXT_GET_CLASS (self)->cairo_create (self);
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gdk_cairo_region (cr, gdk_draw_context_get_frame_region (draw_context));
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cairo_clip (cr);
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return cr;
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}
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