forked from AuroraMiddleware/gtk
83ea0b3714
We used to pass 2 regions to GdkDrawCotnext.end_frame() but code was confusing what they meant. So we now don't do that anymore and only pass the region that matters: The frame region.
251 lines
8.1 KiB
C
251 lines
8.1 KiB
C
/* GDK - The GIMP Drawing Kit
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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-wayland.h"
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#include "gdkprivate-wayland.h"
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#include "gdkinternals.h"
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static const cairo_user_data_key_t gdk_wayland_cairo_context_key;
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static const cairo_user_data_key_t gdk_wayland_cairo_region_key;
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G_DEFINE_TYPE (GdkWaylandCairoContext, gdk_wayland_cairo_context, GDK_TYPE_CAIRO_CONTEXT)
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static void
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gdk_wayland_cairo_context_surface_add_region (cairo_surface_t *surface,
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const cairo_region_t *region)
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{
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cairo_region_t *surface_region;
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surface_region = cairo_surface_get_user_data (surface, &gdk_wayland_cairo_region_key);
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if (surface_region == NULL)
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{
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surface_region = cairo_region_copy (region);
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cairo_surface_set_user_data (surface,
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&gdk_wayland_cairo_region_key,
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surface_region,
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(cairo_destroy_func_t) cairo_region_destroy);
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}
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else
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{
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cairo_region_union (surface_region, region);
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}
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}
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static void
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gdk_wayland_cairo_context_surface_clear_region (cairo_surface_t *surface)
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{
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cairo_surface_set_user_data (surface, &gdk_wayland_cairo_region_key, NULL, NULL);
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}
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static const cairo_region_t *
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gdk_wayland_cairo_context_surface_get_region (cairo_surface_t *surface)
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{
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return cairo_surface_get_user_data (surface, &gdk_wayland_cairo_region_key);
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}
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static GdkWaylandCairoContext *
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gdk_wayland_cairo_context_get_from_surface (cairo_surface_t *surface)
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{
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return cairo_surface_get_user_data (surface, &gdk_wayland_cairo_context_key);
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}
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static void
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gdk_wayland_cairo_context_add_surface (GdkWaylandCairoContext *self,
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cairo_surface_t *surface)
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{
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cairo_surface_reference (surface);
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cairo_surface_set_user_data (surface, &gdk_wayland_cairo_context_key, self, NULL);
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self->surfaces = g_slist_prepend (self->surfaces, surface);
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}
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static void
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gdk_wayland_cairo_context_remove_surface (GdkWaylandCairoContext *self,
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cairo_surface_t *surface)
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{
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self->surfaces = g_slist_remove (self->surfaces, surface);
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cairo_surface_set_user_data (surface, &gdk_wayland_cairo_context_key, NULL, NULL);
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cairo_surface_destroy (surface);
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}
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static void
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gdk_wayland_cairo_context_buffer_release (void *_data,
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struct wl_buffer *wl_buffer)
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{
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cairo_surface_t *cairo_surface = _data;
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GdkWaylandCairoContext *self = gdk_wayland_cairo_context_get_from_surface (cairo_surface);
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/* context was destroyed before compositor released this buffer */
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if (self == NULL)
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return;
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/* Cache one surface for reuse when drawing */
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if (self->cached_surface == NULL)
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{
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self->cached_surface = cairo_surface;
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return;
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}
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/* Get rid of all the extra ones */
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gdk_wayland_cairo_context_remove_surface (self, cairo_surface);
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}
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static const struct wl_buffer_listener buffer_listener = {
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gdk_wayland_cairo_context_buffer_release
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};
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static cairo_surface_t *
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gdk_wayland_cairo_context_create_surface (GdkWaylandCairoContext *self)
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{
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GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (self)));
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GdkSurface *surface = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (self));
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cairo_surface_t *cairo_surface;
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struct wl_buffer *buffer;
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cairo_region_t *region;
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int width, height;
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width = gdk_surface_get_width (surface);
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height = gdk_surface_get_height (surface);
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cairo_surface = _gdk_wayland_display_create_shm_surface (display_wayland,
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width, height,
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gdk_surface_get_scale_factor (surface));
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buffer = _gdk_wayland_shm_surface_get_wl_buffer (cairo_surface);
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wl_buffer_add_listener (buffer, &buffer_listener, cairo_surface);
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gdk_wayland_cairo_context_add_surface (self, cairo_surface);
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region = cairo_region_create_rectangle (&(cairo_rectangle_int_t) { 0, 0, width, height });
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gdk_wayland_cairo_context_surface_add_region (cairo_surface, region);
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cairo_region_destroy (region);
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return cairo_surface;
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}
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static void
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gdk_wayland_cairo_context_begin_frame (GdkDrawContext *draw_context,
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cairo_region_t *region)
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{
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GdkWaylandCairoContext *self = GDK_WAYLAND_CAIRO_CONTEXT (draw_context);
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const cairo_region_t *surface_region;
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GSList *l;
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cairo_t *cr;
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if (self->cached_surface)
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self->paint_surface = g_steal_pointer (&self->cached_surface);
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else
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self->paint_surface = gdk_wayland_cairo_context_create_surface (self);
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surface_region = gdk_wayland_cairo_context_surface_get_region (self->paint_surface);
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if (surface_region)
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cairo_region_union (region, surface_region);
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for (l = self->surfaces; l; l = l->next)
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{
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gdk_wayland_cairo_context_surface_add_region (l->data, region);
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}
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/* clear the repaint area */
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cr = cairo_create (self->paint_surface);
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cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
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gdk_cairo_region (cr, region);
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cairo_fill (cr);
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cairo_destroy (cr);
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}
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static void
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gdk_wayland_cairo_context_end_frame (GdkDrawContext *draw_context,
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cairo_region_t *painted)
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{
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GdkWaylandCairoContext *self = GDK_WAYLAND_CAIRO_CONTEXT (draw_context);
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GdkSurface *surface = gdk_draw_context_get_surface (draw_context);
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gdk_wayland_surface_attach_image (surface, self->paint_surface, painted);
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gdk_wayland_surface_sync (surface);
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gdk_wayland_cairo_context_surface_clear_region (self->paint_surface);
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self->paint_surface = NULL;
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}
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static void
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gdk_wayland_cairo_context_clear_all_cairo_surfaces (GdkWaylandCairoContext *self)
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{
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self->cached_surface = NULL;
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while (self->surfaces)
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gdk_wayland_cairo_context_remove_surface (self, self->surfaces->data);
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}
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static void
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gdk_wayland_cairo_context_surface_resized (GdkDrawContext *draw_context)
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{
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GdkWaylandCairoContext *self = GDK_WAYLAND_CAIRO_CONTEXT (draw_context);
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gdk_wayland_cairo_context_clear_all_cairo_surfaces (self);
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}
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static cairo_t *
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gdk_wayland_cairo_context_cairo_create (GdkCairoContext *context)
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{
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GdkWaylandCairoContext *self = GDK_WAYLAND_CAIRO_CONTEXT (context);
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cairo_t *cr;
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if (self->paint_surface == NULL)
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return NULL;
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cr = cairo_create (self->paint_surface);
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gdk_cairo_region (cr, gdk_wayland_cairo_context_surface_get_region (self->paint_surface));
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cairo_clip (cr);
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return cr;
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}
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static void
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gdk_wayland_cairo_context_dispose (GObject *object)
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{
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GdkWaylandCairoContext *self = GDK_WAYLAND_CAIRO_CONTEXT (object);
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gdk_wayland_cairo_context_clear_all_cairo_surfaces (self);
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G_OBJECT_CLASS (gdk_wayland_cairo_context_parent_class)->dispose (object);
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}
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static void
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gdk_wayland_cairo_context_class_init (GdkWaylandCairoContextClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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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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gobject_class->dispose = gdk_wayland_cairo_context_dispose;
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draw_context_class->begin_frame = gdk_wayland_cairo_context_begin_frame;
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draw_context_class->end_frame = gdk_wayland_cairo_context_end_frame;
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draw_context_class->surface_resized = gdk_wayland_cairo_context_surface_resized;
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cairo_context_class->cairo_create = gdk_wayland_cairo_context_cairo_create;
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}
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static void
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gdk_wayland_cairo_context_init (GdkWaylandCairoContext *self)
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{
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}
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