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- /**********************************************************************\
-
- File: Skipaline U-D.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 Skipaline(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
-
- /* Copy even-numbered rows starting at the top and moving down, and copy odd-
- numbered rows starting at the bottom and moving up. */
-
- pascal short Skipaline(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
- {
- Rect thisone,thatone;
-
- SetRect(&thisone, boundsRect.left, boundsRect.top, boundsRect.right, boundsRect.top+1);
- SetRect(&thatone, boundsRect.left, boundsRect.bottom-1, boundsRect.right, boundsRect.bottom);
- if (theWindowHeight%2)
- OffsetRect(&thatone, 0, -1);
-
- while (thisone.top<boundsRect.bottom)
- {
- StartTiming();
- CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
- &thisone, &thisone, 0, 0L);
- CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
- &thatone, &thatone, 0, 0L);
- thisone.top+=2; /* even row goes down by 2 */
- thisone.bottom+=2;
- thatone.top-=2; /* odd row goes up by 2 */
- thatone.bottom-=2;
- TimeCorrection(CorrectTime);
- }
-
- return 0;
- }
-