/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* Cairo - a vector graphics library with display and print output
 *
 * Copyright © 2005 Red Hat, Inc.
 * Copyright © 2012 Intel Corporation
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Red Hat, Inc.
 *
 * Contributor(s):
 *	Owen Taylor <otaylor@redhat.com>
 *	Stuart Parmenter <stuart@mozilla.com>
 *	Vladimir Vukicevic <vladimir@pobox.com>
 */

#include "cairoint.h"

#include "cairo-atomic-private.h"
#include "cairo-device-private.h"
#include "cairo-win32-private.h"

#include <wchar.h>
#include <windows.h>

static cairo_device_t *__cairo_win32_device;

static cairo_status_t
_cairo_win32_device_flush (void *device)
{
    GdiFlush ();
    return CAIRO_STATUS_SUCCESS;
}

static void
_cairo_win32_device_finish (void *device)
{
}

static void
_cairo_win32_device_destroy (void *device)
{
    free (device);
}

static const cairo_device_backend_t _cairo_win32_device_backend = {
    CAIRO_DEVICE_TYPE_WIN32,

    NULL, NULL, /* lock, unlock */

    _cairo_win32_device_flush,
    _cairo_win32_device_finish,
    _cairo_win32_device_destroy,
};

cairo_device_t *
_cairo_win32_device_get (void)
{
    cairo_win32_device_t *device;

    if (__cairo_win32_device)
	return cairo_device_reference (__cairo_win32_device);

    device = _cairo_calloc (sizeof (*device));

    _cairo_device_init (&device->base, &_cairo_win32_device_backend);

    device->compositor = _cairo_win32_gdi_compositor_get ();

    if (_cairo_atomic_ptr_cmpxchg ((cairo_atomic_intptr_t *)&__cairo_win32_device, NULL, device))
	return cairo_device_reference(&device->base);

    _cairo_win32_device_destroy (device);
    return cairo_device_reference (__cairo_win32_device);
}

unsigned
_cairo_win32_flags_for_dc (HDC dc, cairo_format_t format)
{
    uint32_t flags = 0;
    cairo_bool_t is_display = GetDeviceCaps(dc, TECHNOLOGY) == DT_RASDISPLAY;

    if (format == CAIRO_FORMAT_RGB24 || format == CAIRO_FORMAT_ARGB32)
    {
	int cap = GetDeviceCaps(dc, RASTERCAPS);
	if (cap & RC_BITBLT)
	    flags |= CAIRO_WIN32_SURFACE_CAN_BITBLT;
	if (!is_display && GetDeviceCaps(dc, SHADEBLENDCAPS) != SB_NONE)
	    flags |= CAIRO_WIN32_SURFACE_CAN_ALPHABLEND;

	/* ARGB32 available operations are a strict subset of RGB24
	 * available operations. This is because the same GDI functions
	 * can be used but most of them always reset alpha channel to 0
	 * which is bad for ARGB32.
	 */
	if (format == CAIRO_FORMAT_RGB24)
	{
	    flags |= CAIRO_WIN32_SURFACE_CAN_RGB_BRUSH;
	    if (cap & RC_STRETCHBLT)
		flags |= CAIRO_WIN32_SURFACE_CAN_STRETCHBLT;
	    if (cap & RC_STRETCHDIB)
		flags |= CAIRO_WIN32_SURFACE_CAN_STRETCHDIB;
	}
    }

    if (is_display) {
	flags |= CAIRO_WIN32_SURFACE_IS_DISPLAY;

	/* These will always be possible, but the actual GetDeviceCaps
	 * calls will return whether they're accelerated or not.
	 * We may want to use our own (pixman) routines sometimes
	 * if they're eventually faster, but for now have GDI do
	 * everything.
	 */
#if 0
	flags |= CAIRO_WIN32_SURFACE_CAN_BITBLT;
	flags |= CAIRO_WIN32_SURFACE_CAN_ALPHABLEND;
	flags |= CAIRO_WIN32_SURFACE_CAN_STRETCHBLT;
	flags |= CAIRO_WIN32_SURFACE_CAN_STRETCHDIB;
#endif
    }

    return flags;
}