mirror of
https://github.com/RTimothyEdwards/magic.git
synced 2026-08-29 17:39:28 +02:00
Darryl L. Miles
0b29b1cc12
commit 86b5d591d from 20241004 by me, modified return type of
GrTextSize API in the graphics from 'void' to 'int' to convey
and error scenario to indicate when 'r' was not filled in for
the caller, but this is a multi graphics driver API interface
so requires all downstream graphics engines to also support
the return type change.
This API can error and indicates when 'Rect *r' was
successfully updated.
291 lines
6.3 KiB
C
291 lines
6.3 KiB
C
/*
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* grNull.c -
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*
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* *********************************************************************
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* * Copyright (C) 1985, 1990 Regents of the University of California. *
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* * Permission to use, copy, modify, and distribute this *
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* * software and its documentation for any purpose and without *
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* * fee is hereby granted, provided that the above copyright *
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* * notice appear in all copies. The University of California *
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* * makes no representations about the suitability of this *
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* * software for any purpose. It is provided "as is" without *
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* * express or implied warranty. Export of this software outside *
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* * of the United States of America may require an export license. *
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* *********************************************************************
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*
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* This file contains dummy functions for use when there is no
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* graphics display.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "utils/magsgtty.h"
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#include "utils/magic.h"
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#include "utils/geometry.h"
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#include "windows/windows.h"
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#include "graphics/graphics.h"
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#include "graphics/graphicsInt.h"
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#include "textio/textio.h"
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#include "textio/txcommands.h"
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#include "utils/signals.h"
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#ifndef lint
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static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/graphics/grNull.c,v 1.1.1.1 2008/02/03 20:43:50 tim Exp $";
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#endif /* not lint */
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/* Forward declarations */
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extern bool nullReturnFalse();
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extern void nullDoNothing();
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extern int nullReturnZero();
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/*
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*---------------------------------------------------------
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*
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* nullDoNothing --
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*
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* This procedure does nothing.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* None.
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*
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*---------------------------------------------------------
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*/
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void
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nullDoNothing()
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{
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}
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/*
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*---------------------------------------------------------
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*
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* nullReturnFalse --
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*
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* This procedure does nothing, and returns FALSE.
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*
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* Results:
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* Returns FALSE always.
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*
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* Side Effects:
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* None.
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*
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*---------------------------------------------------------
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*/
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bool
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nullReturnFalse()
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{
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return (FALSE);
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}
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/*
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*---------------------------------------------------------
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*
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* nullReturnZero --
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*
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* This procedure does nothing, and returns 0.
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*
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* Results:
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* Returns 0 always.
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*
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* Side Effects:
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* None.
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*
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*---------------------------------------------------------
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*/
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int
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nullReturnZero()
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{
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return (0);
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}
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/*
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*---------------------------------------------------------
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*
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* NullInit --
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*
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* NullInit doesn't do much of anything.
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*
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* Results:
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* TRUE always.
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*
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* Side Effects:
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* None.
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*
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*---------------------------------------------------------
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*/
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bool
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NullInit()
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{
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return TRUE;
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}
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/*
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* ----------------------------------------------------------------------------
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*
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* NullTextSize --
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*
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* Determine the size of a text string.
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*
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* Results:
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* Returns 0 indicating 'r' has been updated.
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*
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* Side effects:
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* A rectangle is filled in that is the size of the text in pixels.
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* The origin (0, 0) of this rectangle is located on the baseline
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* at the far left side of the string.
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*
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* ----------------------------------------------------------------------------
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*/
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int
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NullTextSize(text, size, r)
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char *text;
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int size;
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Rect *r;
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{
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ASSERT(r != NULL, "nullTextSize");
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r->r_xbot = 0;
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r->r_xtop = strlen(text);
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r->r_ybot = 0;
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r->r_ytop = 1;
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return 0;
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}
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/*
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* ----------------------------------------------------------------------------
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*
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* nullStdin --
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*
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* Handle the stdin device for the NULL driver.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* Adds events to the event queue.
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*
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* ----------------------------------------------------------------------------
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*/
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/** @typedef cb_textio_input_t */
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void
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nullStdin(
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int fd,
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ClientData cdata) /* notused */
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{
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int ch;
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TxInputEvent *event;
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ch = getc(stdin);
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event = TxNewEvent();
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if (ch == EOF)
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event->txe_button = TX_EOF;
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else
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event->txe_button = TX_NO_BUTTON;
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event->txe_buttonAction = 0;
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event->txe_ch = ch;
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event->txe_wid = WIND_UNKNOWN_WINDOW;
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event->txe_p.p_x = GR_CURSOR_X;
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event->txe_p.p_y = GR_CURSOR_Y;
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TxAddEvent(event);
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}
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/*
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* ----------------------------------------------------------------------------
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*
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* NullBitBlt --
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*
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* A no-op BitBlt operation for devices that don't have one (such as
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* the NULL device).
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*
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* Results:
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* None.
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*
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* Side Effects:
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* None, for sure, for sure.
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*
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* ----------------------------------------------------------------------------
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*/
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void
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NullBitBlt()
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{
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}
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/*
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*---------------------------------------------------------
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*
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* nullSetDisplay --
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*
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* This routine sets the appropriate parameters so that
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* Magic will work with the particular display type.
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*
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* Results:
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* Returns TRUE.
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*
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* Side Effects:
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* Depends on the display type.
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*
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*---------------------------------------------------------
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*/
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bool
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nullSetDisplay(dispType, outFileName, mouseFileName)
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char *dispType;
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char *outFileName;
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char *mouseFileName;
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{
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TxPrintf("Using NULL graphics device.\n");
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TxAdd1InputDevice(fileno(stdin), nullStdin, (ClientData) NULL);
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if (TxStdinIsatty) SigWatchFile(fileno(stdin), "stdin");
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/* Set up the procedure values in the indirection table. */
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GrLockPtr = grSimpleLock;
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GrUnlockPtr = grSimpleUnlock;
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GrInitPtr = NullInit;
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GrClosePtr = nullDoNothing;
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GrSetCMapPtr = nullDoNothing;
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GrEnableTabletPtr = nullDoNothing;
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GrDisableTabletPtr = nullDoNothing;
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GrSetCursorPtr = nullDoNothing;
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GrTextSizePtr = NullTextSize;
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GrDrawGlyphPtr = nullDoNothing;
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GrBitBltPtr = NullBitBlt;
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GrReadPixelPtr = nullReturnZero;
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GrFlushPtr = nullDoNothing;
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/* local indirections */
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grSetSPatternPtr = nullDoNothing;
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grPutTextPtr = nullDoNothing;
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grFontTextPtr = nullDoNothing;
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grDefineCursorPtr = nullDoNothing;
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grDrawGridPtr = nullReturnFalse;
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grDrawLinePtr = nullDoNothing;
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grSetWMandCPtr = nullDoNothing;
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grFillRectPtr = nullDoNothing;
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grSetStipplePtr = nullDoNothing;
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grSetLineStylePtr = nullDoNothing;
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grSetCharSizePtr = nullDoNothing;
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GrScreenRect.r_xtop = 511;
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GrScreenRect.r_ytop = 483;
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/* Set GrDisplayStatus to force graphics updates to be suspended */
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GrDisplayStatus = DISPLAY_SUSPEND;
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return TRUE;
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}
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