forked from AuroraMiddleware/gtk
ae7a677346
Now that all Cairo contexts are ported to managing cairo surfaces themselves, the old fallback code that didi the managing is no longer needed. Also clarify the behavior of gdk_cairo_context_cairo_create() wrt the vfunc by doing the early exit and the clipping outside of it.
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* gdkcairocontext-x11.c: X11 specific Cairo wrappers
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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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#include "config.h"
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#include "gdkcairocontext-x11.h"
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#include "gdkprivate-x11.h"
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#include "gdkcairo.h"
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#include "gdkinternals.h"
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#include <X11/Xlib.h>
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G_DEFINE_TYPE (GdkX11CairoContext, gdk_x11_cairo_context, GDK_TYPE_CAIRO_CONTEXT)
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static cairo_surface_t *
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create_cairo_surface_for_surface (GdkSurface *surface)
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{
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GdkDisplay *display;
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cairo_surface_t *cairo_surface;
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Visual *visual;
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int scale;
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display = gdk_surface_get_display (surface);
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scale = gdk_surface_get_scale_factor (surface);
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visual = gdk_x11_display_get_window_visual (GDK_X11_DISPLAY (display));
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cairo_surface = cairo_xlib_surface_create (gdk_x11_display_get_xdisplay (display),
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GDK_SURFACE_XID (surface),
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visual,
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gdk_surface_get_width (surface) * scale,
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gdk_surface_get_height (surface) * scale);
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cairo_surface_set_device_scale (cairo_surface, scale, scale);
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return cairo_surface;
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}
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static void
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gdk_x11_cairo_context_begin_frame (GdkDrawContext *draw_context,
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cairo_region_t *region)
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{
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GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (draw_context);
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GdkRectangle clip_box;
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GdkSurface *surface;
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double sx, sy;
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surface = gdk_draw_context_get_surface (draw_context);
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cairo_region_get_extents (region, &clip_box);
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self->window_surface = create_cairo_surface_for_surface (surface);
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self->paint_surface = gdk_surface_create_similar_surface (surface,
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cairo_surface_get_content (self->window_surface),
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MAX (clip_box.width, 1),
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MAX (clip_box.height, 1));
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sx = sy = 1;
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cairo_surface_get_device_scale (self->paint_surface, &sx, &sy);
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cairo_surface_set_device_offset (self->paint_surface, -clip_box.x*sx, -clip_box.y*sy);
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}
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static void
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gdk_x11_cairo_context_end_frame (GdkDrawContext *draw_context,
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cairo_region_t *painted)
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{
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GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (draw_context);
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cairo_t *cr;
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cr = cairo_create (self->window_surface);
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cairo_set_source_surface (cr, self->paint_surface, 0, 0);
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gdk_cairo_region (cr, painted);
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cairo_clip (cr);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_paint (cr);
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cairo_destroy (cr);
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cairo_surface_flush (self->window_surface);
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g_clear_pointer (&self->paint_surface, cairo_surface_destroy);
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g_clear_pointer (&self->window_surface, cairo_surface_destroy);
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}
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static cairo_t *
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gdk_x11_cairo_context_cairo_create (GdkCairoContext *context)
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{
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GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (context);
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return cairo_create (self->paint_surface);
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}
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static void
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gdk_x11_cairo_context_class_init (GdkX11CairoContextClass *klass)
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{
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GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
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GdkCairoContextClass *cairo_context_class = GDK_CAIRO_CONTEXT_CLASS (klass);
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draw_context_class->begin_frame = gdk_x11_cairo_context_begin_frame;
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draw_context_class->end_frame = gdk_x11_cairo_context_end_frame;
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cairo_context_class->cairo_create = gdk_x11_cairo_context_cairo_create;
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}
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static void
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gdk_x11_cairo_context_init (GdkX11CairoContext *self)
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{
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}
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