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16c7003acb
We know it at begin_frame() time, so if we pass it there instead of end_frame(), we can use it then to make decisions about opacity. For example, we could notice that the whole surface is opaque and choose an RGBx format. We don't do that yet, but now we could.
76 lines
3.4 KiB
C
76 lines
3.4 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* gdkdrawcontext.h: base class for rendering system support
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*
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* Copyright © 2016 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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#pragma once
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#include "gdkdrawcontext.h"
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#include "gdkcolorstateprivate.h"
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#include "gdkmemoryformatprivate.h"
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#include <graphene.h>
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G_BEGIN_DECLS
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#define GDK_DRAW_CONTEXT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_DRAW_CONTEXT, GdkDrawContextClass))
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#define GDK_IS_DRAW_CONTEXT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_DRAW_CONTEXT))
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#define GDK_DRAW_CONTEXT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_DRAW_CONTEXT, GdkDrawContextClass))
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typedef struct _GdkDrawContextClass GdkDrawContextClass;
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struct _GdkDrawContext
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{
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GObject parent_instance;
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};
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struct _GdkDrawContextClass
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{
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GObjectClass parent_class;
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void (* begin_frame) (GdkDrawContext *context,
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GdkMemoryDepth depth,
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cairo_region_t *update_area,
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GdkColorState **out_color_state,
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GdkMemoryDepth *out_depth);
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void (* end_frame) (GdkDrawContext *context,
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cairo_region_t *painted);
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void (* empty_frame) (GdkDrawContext *context);
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void (* surface_resized) (GdkDrawContext *context);
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};
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void gdk_draw_context_surface_resized (GdkDrawContext *context);
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void gdk_draw_context_begin_frame_full (GdkDrawContext *context,
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GdkMemoryDepth depth,
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const cairo_region_t *region,
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const graphene_rect_t *opaque);
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void gdk_draw_context_end_frame_full (GdkDrawContext *context);
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void gdk_draw_context_empty_frame (GdkDrawContext *context);
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#define gdk_draw_context_get_frame_region(...) _gdk_draw_context_get_frame_region(__VA_ARGS__)
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const cairo_region_t * _gdk_draw_context_get_frame_region (GdkDrawContext *self);
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GdkColorState * gdk_draw_context_get_color_state (GdkDrawContext *self);
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GdkMemoryDepth gdk_draw_context_get_depth (GdkDrawContext *self);
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G_END_DECLS
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