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/* GDK - The GIMP Drawing Kit
*
* gdkcairocontext-x11.c: X11 specific Cairo wrappers
*
* Copyright © 2016 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-x11.h"
#include "gdkprivate-x11.h"
#include "gdkcairo.h"
#include "gdksurfaceprivate.h"
#include <X11/Xlib.h>
G_DEFINE_TYPE (GdkX11CairoContext, gdk_x11_cairo_context, GDK_TYPE_CAIRO_CONTEXT)
static cairo_surface_t *
create_cairo_surface_for_surface (GdkSurface *surface)
{
GdkDisplay *display;
cairo_surface_t *cairo_surface;
Visual *visual;
int scale;
display = gdk_surface_get_display (surface);
scale = gdk_surface_get_scale_factor (surface);
visual = gdk_x11_display_get_window_visual (GDK_X11_DISPLAY (display));
cairo_surface = cairo_xlib_surface_create (gdk_x11_display_get_xdisplay (display),
GDK_SURFACE_XID (surface),
visual,
gdk_surface_get_width (surface) * scale,
gdk_surface_get_height (surface) * scale);
cairo_surface_set_device_scale (cairo_surface, scale, scale);
return cairo_surface;
}
static void
gdk_x11_cairo_context_begin_frame (GdkDrawContext *draw_context,
gboolean prefers_high_depth,
cairo_region_t *region)
{
GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (draw_context);
GdkRectangle clip_box;
GdkSurface *surface;
double sx, sy;
surface = gdk_draw_context_get_surface (draw_context);
cairo_region_get_extents (region, &clip_box);
self->window_surface = create_cairo_surface_for_surface (surface);
self->paint_surface = gdk_surface_create_similar_surface (surface,
cairo_surface_get_content (self->window_surface),
MAX (clip_box.width, 1),
MAX (clip_box.height, 1));
sx = sy = 1;
cairo_surface_get_device_scale (self->paint_surface, &sx, &sy);
cairo_surface_set_device_offset (self->paint_surface, -clip_box.x*sx, -clip_box.y*sy);
}
static void
gdk_x11_cairo_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (draw_context);
cairo_t *cr;
cr = cairo_create (self->window_surface);
cairo_set_source_surface (cr, self->paint_surface, 0, 0);
gdk_cairo_region (cr, painted);
cairo_clip (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_flush (self->window_surface);
g_clear_pointer (&self->paint_surface, cairo_surface_destroy);
g_clear_pointer (&self->window_surface, cairo_surface_destroy);
}
static cairo_t *
gdk_x11_cairo_context_cairo_create (GdkCairoContext *context)
{
GdkX11CairoContext *self = GDK_X11_CAIRO_CONTEXT (context);
return cairo_create (self->paint_surface);
}
static void
gdk_x11_cairo_context_class_init (GdkX11CairoContextClass *klass)
{
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
GdkCairoContextClass *cairo_context_class = GDK_CAIRO_CONTEXT_CLASS (klass);
draw_context_class->begin_frame = gdk_x11_cairo_context_begin_frame;
draw_context_class->end_frame = gdk_x11_cairo_context_end_frame;
cairo_context_class->cairo_create = gdk_x11_cairo_context_cairo_create;
}
static void
gdk_x11_cairo_context_init (GdkX11CairoContext *self)
{
}
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