harvey/sys/src/cmd/gs/src/idisp.c

/* Copyright (C) 2001, Ghostgum Software Pty Ltd.  All rights reserved.

   This file is part of AFPL Ghostscript.

   AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
   or distributor accepts any responsibility for the consequences of using it,
   or for whether it serves any particular purpose or works at all, unless he
   or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
   License (the "License") for full details.

   Every copy of AFPL Ghostscript must include a copy of the License,
   normally in a plain ASCII text file named PUBLIC.  The License grants you
   the right to copy, modify and redistribute AFPL Ghostscript, but only
   under certain conditions described in the License.  Among other things, the
   License requires that the copyright notice and this notice be preserved on
   all copies.
 */

/* idisp.c */

/*
 * This allows the interpreter to set the callback structure 
 * of the "display" device.  This must set at the end of 
 * initialization and before the device is used.
 * This is harmless if the 'display' device is not included.
 * If gsapi_set_display_callback() is not called, this code
 * won't even be used.
 */

#include "stdio_.h"
#include "stdpre.h"
#include "iapi.h"
#include "ghost.h"
#include "gp.h"
#include "gscdefs.h"
#include "gsmemory.h"
#include "gstypes.h"
#include "gsdevice.h"
#include "iref.h"
#include "imain.h"
#include "iminst.h"
#include "oper.h"
#include "ostack.h"
#include "gx.h"
#include "gxdevice.h"
#include "gxdevmem.h"
#include "idisp.h"
#include "gdevdsp.h"
#include "gdevdsp2.h"

int
display_set_callback(gs_main_instance *minst, display_callback *callback)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    bool was_open;
    int code;
    int exit_code = 0;
    os_ptr op = osp;
    gx_device *dev;
    gx_device_display *ddev;

    /* If display device exists, copy prototype if needed and return
     *  device true
     * If it doesn't exist, return
     *  false
     */
    const char getdisplay[] = 
      "devicedict /display known dup { /display finddevice exch } if";
    code = gs_main_run_string(minst, getdisplay, 0, &exit_code, 
	&minst->error_object);
    if (code < 0)
       return code;

    op = osp;
    check_type(*op, t_boolean);
    if (op->value.boolval) {
	/* display device was included in Ghostscript so we need
	 * to set the callback structure pointer within it.
	 * If the device is already open, close it before
	 * setting callback, then reopen it.
	 */
	check_read_type(op[-1], t_device);
	dev = op[-1].value.pdevice;
	
	was_open = dev->is_open;
	if (was_open) {
	    code = gs_closedevice(dev);
	    if (code < 0)
		return_error(code);
	}

	ddev = (gx_device_display *) dev;
	ddev->callback = callback;

	if (was_open) {
	    code = gs_opendevice(dev);
	    if (code < 0)
		return_error(code);
	}
	pop(1);	/* device */
    }
    pop(1);	/* boolean */
    return 0;
}