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/* Copyright (C) 2001, Ghostgum Software Pty Ltd. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* idisp.c */
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/* $Id: idisp.c,v 1.7 2004/07/03 10:51:14 ghostgum Exp $ */
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/*
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* This allows the interpreter to set the callback structure
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* of the "display" device. This must set at the end of
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* initialization and before the device is used.
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* This is harmless if the 'display' device is not included.
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* If gsapi_set_display_callback() is not called, this code
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* won't even be used.
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*/
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#include "stdio_.h"
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#include "stdpre.h"
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#include "iapi.h"
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#include "ghost.h"
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#include "gp.h"
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#include "gscdefs.h"
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#include "gsmemory.h"
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#include "gstypes.h"
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#include "gsdevice.h"
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#include "iref.h"
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#include "imain.h"
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#include "iminst.h"
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#include "oper.h"
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#include "ostack.h"
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#include "gx.h"
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#include "gxdevice.h"
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#include "gxdevmem.h"
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#include "idisp.h"
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#include "gdevdevn.h"
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#include "gsequivc.h"
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#include "gdevdsp.h"
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#include "gdevdsp2.h"
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int
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display_set_callback(gs_main_instance *minst, display_callback *callback)
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{
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i_ctx_t *i_ctx_p = minst->i_ctx_p;
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bool was_open;
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int code;
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int exit_code = 0;
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os_ptr op = osp;
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gx_device *dev;
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gx_device_display *ddev;
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/* If display device exists, copy prototype if needed and return
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* device true
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* If it doesn't exist, return
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* false
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*/
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const char getdisplay[] =
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"devicedict /display known dup { /display finddevice exch } if";
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code = gs_main_run_string(minst, getdisplay, 0, &exit_code,
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&minst->error_object);
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if (code < 0)
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return code;
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op = osp;
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check_type(*op, t_boolean);
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if (op->value.boolval) {
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/* display device was included in Ghostscript so we need
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* to set the callback structure pointer within it.
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* If the device is already open, close it before
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* setting callback, then reopen it.
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*/
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check_read_type(op[-1], t_device);
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dev = op[-1].value.pdevice;
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was_open = dev->is_open;
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if (was_open) {
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code = gs_closedevice(dev);
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if (code < 0)
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return_error(code);
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}
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ddev = (gx_device_display *) dev;
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ddev->callback = callback;
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if (was_open) {
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code = gs_opendevice(dev);
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if (code < 0) {
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dprintf("**** Unable to open the display device, quitting.\n");
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return_error(code);
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}
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}
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pop(1); /* device */
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}
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pop(1); /* boolean */
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return 0;
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}
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