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/* cairo - a vector graphics library with display and print output

 *

 * Copyright © 2009 Eric Anholt

 * Copyright © 2009 Chris Wilson

 * Copyright © 2005 Red Hat, Inc

 *

 * 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):

 *	Carl Worth 

 *	Chris Wilson 

 *	Zoxc 

 */

#include "cairoint.h"

#include "cairo-gl-private.h"

#include "cairo-error-private.h"

#define WIN32_LEAN_AND_MEAN

#include 

typedef struct _cairo_wgl_context {

    cairo_gl_context_t base;

    HDC dummy_dc;

    HWND dummy_wnd;

    HGLRC rc;

    HDC prev_dc;

    HGLRC prev_rc;

} cairo_wgl_context_t;

typedef struct _cairo_wgl_surface {

    cairo_gl_surface_t base;

    HDC dc;

} cairo_wgl_surface_t;

static void

_wgl_acquire (void *abstract_ctx)

{

    cairo_wgl_context_t *ctx = abstract_ctx;

    HDC current_dc;

    ctx->prev_dc = wglGetCurrentDC ();

    ctx->prev_rc = wglGetCurrentContext ();

    if (ctx->base.current_target == NULL ||

        _cairo_gl_surface_is_texture (ctx->base.current_target))

    {

        current_dc = ctx->dummy_dc;

    }

    else

    {

        cairo_wgl_surface_t *surface = (cairo_wgl_surface_t *) ctx->base.current_target;

        current_dc = surface->dc;

    }

    if (ctx->prev_dc != current_dc ||

	(ctx->prev_rc != ctx->rc &&

	 current_dc != ctx->dummy_dc))

    {

        wglMakeCurrent (current_dc, ctx->rc);

    }

}

static void

_wgl_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)

{

    cairo_wgl_context_t *ctx = abstract_ctx;

    cairo_wgl_surface_t *surface = (cairo_wgl_surface_t *) abstract_surface;

    /* Set the window as the target of our context. */

    wglMakeCurrent (surface->dc, ctx->rc);

}

static void

_wgl_release (void *abstract_ctx)

{

    cairo_wgl_context_t *ctx = abstract_ctx;

    if (ctx->prev_dc != wglGetCurrentDC () ||

        ctx->prev_rc != wglGetCurrentContext ())

    {

        wglMakeCurrent (ctx->prev_dc,

                        ctx->prev_rc);

    }

}

static void

_wgl_swap_buffers (void *abstract_ctx,

		   cairo_gl_surface_t *abstract_surface)

{

    cairo_wgl_surface_t *surface = (cairo_wgl_surface_t *) abstract_surface;

    SwapBuffers (surface->dc);

}

static void

_wgl_destroy (void *abstract_ctx)

{

    cairo_wgl_context_t *ctx = abstract_ctx;

    if (ctx->dummy_dc != 0) {

        wglMakeCurrent (ctx->dummy_dc, 0);

        ReleaseDC (ctx->dummy_wnd, ctx->dummy_dc);

        DestroyWindow (ctx->dummy_wnd);

    }

}

static cairo_status_t

_wgl_dummy_ctx (cairo_wgl_context_t *ctx)

{

    WNDCLASSEXA wincl;

    PIXELFORMATDESCRIPTOR pfd;

    int format;

    HDC dc;

    ZeroMemory (&wincl, sizeof (WNDCLASSEXA));

    wincl.cbSize = sizeof (WNDCLASSEXA);

    wincl.hInstance = GetModuleHandle (0);

    wincl.lpszClassName = "cairo_wgl_context_dummy";

    wincl.lpfnWndProc = DefWindowProcA;

    wincl.style = CS_OWNDC;

    RegisterClassExA (&wincl);

    ctx->dummy_wnd = CreateWindowA ("cairo_wgl_context_dummy", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

    ctx->dummy_dc = GetDC (ctx->dummy_wnd);

    ZeroMemory (&pfd, sizeof (PIXELFORMATDESCRIPTOR));

    pfd.nSize = sizeof (PIXELFORMATDESCRIPTOR);

    pfd.nVersion = 1;

    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;

    pfd.iPixelType = PFD_TYPE_RGBA;

    pfd.cColorBits = 24;

    pfd.cDepthBits = 16;

    pfd.iLayerType = PFD_MAIN_PLANE;

    format = ChoosePixelFormat (ctx->dummy_dc, &pfd);

    SetPixelFormat (ctx->dummy_dc, format, &pfd);

    wglMakeCurrent(ctx->dummy_dc, ctx->rc);

    return CAIRO_STATUS_SUCCESS;

}

cairo_device_t *

cairo_wgl_device_create (HGLRC rc)

{

    cairo_wgl_context_t *ctx;

    cairo_status_t status;

    ctx = calloc (1, sizeof (cairo_wgl_context_t));

    if (unlikely (ctx == NULL))

        return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);

    ctx->rc = rc;

    ctx->prev_dc = 0;

    ctx->prev_rc = 0;

    status = _wgl_dummy_ctx (ctx);

    if (unlikely (status)) {

        free (ctx);

        return _cairo_gl_context_create_in_error (status);

    }

    ctx->base.acquire = _wgl_acquire;

    ctx->base.release = _wgl_release;

    ctx->base.make_current = _wgl_make_current;

    ctx->base.swap_buffers = _wgl_swap_buffers;

    ctx->base.destroy = _wgl_destroy;

    status = _cairo_gl_dispatch_init (&ctx->base.dispatch,

				      (cairo_gl_get_proc_addr_func_t) wglGetProcAddress);

    if (unlikely (status)) {

	free (ctx);

	return _cairo_gl_context_create_in_error (status);

    }

    status = _cairo_gl_context_init (&ctx->base);

    if (unlikely (status)) {

        free (ctx);

        return _cairo_gl_context_create_in_error (status);

    }

    ctx->base.release (ctx);

    return &ctx->base.base;

}

HGLRC

cairo_wgl_device_get_context (cairo_device_t *device)

{

    cairo_wgl_context_t *ctx;

    if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {

        _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);

        return NULL;

    }

    ctx = (cairo_wgl_context_t *) device;

    return ctx->rc;

}

cairo_surface_t *

cairo_gl_surface_create_for_dc (cairo_device_t	*device,

				HDC			 dc,

				int			 width,

				int			 height)

{

    cairo_wgl_surface_t *surface;

    if (unlikely (device->status))

        return _cairo_surface_create_in_error (device->status);

    if (device->backend->type != CAIRO_DEVICE_TYPE_GL)

        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));

    if (width <= 0 || height <= 0)

        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));

    surface = calloc (1, sizeof (cairo_wgl_surface_t));

    if (unlikely (surface == NULL))

        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));

    _cairo_gl_surface_init (device, &surface->base,

			    CAIRO_CONTENT_COLOR_ALPHA, width, height);

    surface->dc = dc;

    return &surface->base.base;

}