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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 "gdksurfaceprivate.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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