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Skipaline L-R.c
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1994-04-15
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/**********************************************************************\
File: Skipaline L-R.c
Purpose: Graphic effect from offscreen bitmap to main window (on
screen). See comments below for more description.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program in a file named "GNU General Public License".
If not, write to the Free Software Foundation, 675 Mass Ave,
Cambridge, MA 02139, USA.
\**********************************************************************/
#include "timing.h"
#define CorrectTime 1
#define theWindowWidth (boundsRect.right-boundsRect.left)
#define theWindowHeight (boundsRect.bottom-boundsRect.top)
pascal short SkipalineLR(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
/* Copy even-numbered columns starting at the left and moving right, and odd-
numbered columns starting at the right and moving left. */
pascal short SkipalineLR(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
{
Rect thisone,thatone;
Boolean everyOther=FALSE;
SetRect(&thisone, boundsRect.left, boundsRect.top, boundsRect.left+1, boundsRect.bottom);
SetRect(&thatone, boundsRect.right-1, boundsRect.top, boundsRect.right, boundsRect.bottom);
if (theWindowWidth%2)
OffsetRect(&thatone, -1, 0);
while (thisone.left<boundsRect.right)
{
StartTiming();
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&thisone, &thisone, 0, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&thatone, &thatone, 0, 0L);
thisone.left+=2; /* left column moves right by 2 */
thisone.right+=2;
thatone.left-=2; /* right column moves left by 2 */
thatone.right-=2;
if (everyOther)
TimeCorrection(CorrectTime);
everyOther=!everyOther;
}
return 0;
}