src/cairo-wgl-context.c - third_party/cairo - Git at Google

 /* 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 <cworth@cworth.org>
  *	Chris Wilson <chris@chris-wilson.co.uk>
  *	Zoxc <zoxc32@gmail.com>
  */

 #include "cairoint.h"

 #include "cairo-gl-private.h"

 #include "cairo-error-private.h"

 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>

 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;
 }
	/* 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 <cworth@cworth.org>
	* Chris Wilson <chris@chris-wilson.co.uk>
	* Zoxc <zoxc32@gmail.com>
	*/

	#include "cairoint.h"

	#include "cairo-gl-private.h"

	#include "cairo-error-private.h"

	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>

	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;
	}