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- /**********************************************************************\
-
- File: Pour scroll.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 2
- #define theWindowHeight (boundsRect.bottom-boundsRect.top)
- #define theWindowWidth (boundsRect.right-boundsRect.left)
-
- pascal short PourScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
-
- /* Scroll down in tiny strips, starting at the left and moving right. Scroll
- strips 1-(N), then strips 1-(N+1), etc. When strip 1 is done, don't do it
- anymore! (Duh, but this was difficult to get right.) So only scroll strips
- 2-(N), and so on. */
-
- pascal short PourScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
- {
- Rect *theRect, *dest;
- Rect scrollsource;
- int i;
- int startstrip,endstrip;
- int ScrollSize, BoxSize;
- int NumStrips;
-
- ScrollSize=theWindowHeight/50;
- NumStrips=theWindowWidth/4;
- BoxSize=theWindowWidth/NumStrips;
- dest=(Rect*)NewPtr(sizeof(Rect)*NumStrips);
- if (dest==0L)
- return -1; /* memory error */
- theRect=(Rect*)NewPtr(sizeof(Rect)*NumStrips);
- if (theRect==0L)
- {
- DisposePtr(dest);
- return -1; /* memory error */
- }
-
- SetRect(&scrollsource, boundsRect.left, boundsRect.top, boundsRect.left+BoxSize,
- boundsRect.bottom);
-
- for (i=0; i<NumStrips; i++)
- {
- dest[i].top = 0;
- dest[i].bottom=ScrollSize;
- dest[i].left=i*BoxSize;
- dest[i].right=dest[i].left+BoxSize;
- OffsetRect(&(dest[i]), boundsRect.left, boundsRect.top);
-
- theRect[i].top=theWindowHeight-ScrollSize;
- theRect[i].bottom=theWindowHeight;
- theRect[i].left=i*BoxSize;
- theRect[i].right=theRect[i].left+BoxSize;
- OffsetRect(&(theRect[i]), boundsRect.left, boundsRect.top);
- }
-
- startstrip=0;
- endstrip=1;
- do
- {
- StartTiming();
-
- ScrollTheRect(&scrollsource, 0, ScrollSize, 0L);
-
- for (i=startstrip; i<endstrip; i++)
- {
- CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
- &theRect[i], &dest[i], 0, 0L);
- theRect[i].bottom-=ScrollSize;
- theRect[i].top-=ScrollSize;
- }
-
- if (endstrip<NumStrips)
- {
- endstrip++;
- scrollsource.right+=BoxSize;
- }
- if (theRect[startstrip].bottom<=0)
- {
- startstrip++;
- scrollsource.left+=BoxSize;
- }
-
- TimeCorrection(CorrectTime);
- }
- while (startstrip<endstrip);
-
- DisposePtr(dest);
- DisposePtr(theRect);
-
- return 0;
- }
-