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/* GDK - The GIMP Drawing Kit
*
* Copyright © 2018 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 "gdkconfig.h"
#include "gdkcairocontext-win32.h"
#include "gdkprivate-win32.h"
#include "gdksurface-win32.h"
#include "gdkwin32misc.h"
#include <cairo-win32.h>
#include <windows.h>
G_DEFINE_TYPE (GdkWin32CairoContext, gdk_win32_cairo_context, GDK_TYPE_CAIRO_CONTEXT)
static cairo_surface_t *
create_cairo_surface_for_surface (GdkSurface *surface,
int scale)
{
cairo_surface_t *cairo_surface;
HDC hdc;
hdc = GetDC (GDK_SURFACE_HWND (surface));
if (!hdc)
{
WIN32_GDI_FAILED ("GetDC");
return NULL;
}
cairo_surface = cairo_win32_surface_create_with_format (hdc, CAIRO_FORMAT_ARGB32);
cairo_surface_set_device_scale (cairo_surface, scale, scale);
return cairo_surface;
}
static void
gdk_win32_cairo_context_begin_frame (GdkDrawContext *draw_context,
gboolean prefers_high_depth,
cairo_region_t *region)
{
GdkWin32CairoContext *self = GDK_WIN32_CAIRO_CONTEXT (draw_context);
GdkSurface *surface;
int scale;
cairo_t *cr;
int width, height;
RECT queued_window_rect;
surface = gdk_draw_context_get_surface (draw_context);
scale = gdk_surface_get_scale_factor (surface);
queued_window_rect = gdk_win32_surface_handle_queued_move_resize (draw_context);
width = queued_window_rect.right - queued_window_rect.left;
height = queued_window_rect.bottom - queued_window_rect.top;
width = MAX (width, 1);
height = MAX (height, 1);
self->window_surface = create_cairo_surface_for_surface (surface, scale);
if (!self->double_buffered)
/* Non-double-buffered windows paint on the window surface directly */
self->paint_surface = cairo_surface_reference (self->window_surface);
else
{
if (width > self->db_width ||
height > self->db_height)
{
self->db_width = MAX (width, self->db_width);
self->db_height = MAX (height, self->db_height);
g_clear_pointer (&self->db_surface, cairo_surface_destroy);
self->db_surface = gdk_surface_create_similar_surface (surface,
cairo_surface_get_content (self->window_surface),
self->db_width,
self->db_height);
}
/* Double-buffered windows paint on a DB surface.
* Due to performance concerns we don't recreate it unless forced to.
*/
self->paint_surface = cairo_surface_reference (self->db_surface);
}
/* Clear the paint region.
* For non-double-buffered rendering we must clear it, otherwise
* semi-transparent pixels will "add up" with each repaint.
* We must also clear the old pixels from the DB cache surface
* that we're going to use as a buffer.
*/
cr = cairo_create (self->paint_surface);
cairo_set_source_rgba (cr, 0, 0, 0, 00);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
gdk_cairo_region (cr, region);
cairo_clip (cr);
cairo_paint (cr);
cairo_destroy (cr);
}
static void
gdk_win32_cairo_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkWin32CairoContext *self = GDK_WIN32_CAIRO_CONTEXT (draw_context);
/* The code to resize double-buffered windows immediately
* before blitting the buffer contents onto them used
* to be here.
*/
/* For double-buffered windows we need to blit
* the DB buffer contents into the window itself.
*/
if (self->double_buffered)
{
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_win32_cairo_context_cairo_create (GdkCairoContext *context)
{
GdkWin32CairoContext *self = GDK_WIN32_CAIRO_CONTEXT (context);
return cairo_create (self->paint_surface);
}
static void
gdk_win32_cairo_context_finalize (GObject *object)
{
GdkWin32CairoContext *self = GDK_WIN32_CAIRO_CONTEXT (object);
g_clear_pointer (&self->db_surface, cairo_surface_destroy);
G_OBJECT_CLASS (gdk_win32_cairo_context_parent_class)->finalize (object);
}
static void
gdk_win32_cairo_context_class_init (GdkWin32CairoContextClass *klass)
{
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
GdkCairoContextClass *cairo_context_class = GDK_CAIRO_CONTEXT_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gdk_win32_cairo_context_finalize;
draw_context_class->begin_frame = gdk_win32_cairo_context_begin_frame;
draw_context_class->end_frame = gdk_win32_cairo_context_end_frame;
cairo_context_class->cairo_create = gdk_win32_cairo_context_cairo_create;
}
static void
gdk_win32_cairo_context_init (GdkWin32CairoContext *self)
{
self->double_buffered = g_strcmp0 (g_getenv ("GDK_WIN32_CAIRO_DB"), "1") == 0;
self->db_width = -1;
self->db_height = -1;
}
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