Pararena2/Sources/DissBits.c

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//==														==
//==					DissBits Routines					==
//==														==
//============================================================
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//========================================================  Includes  

#include "Globals.h"
#include "UnivUtilities.h"
#include "DissBits.h"


//========================================================  DissBitsMed13QD  

void DissBits13QD (Rect *clippedRect)

{
	Rect			transRect;
	RgnHandle		clipRgn;
	register short	value = 1;
	register short	mask = 0x0CA0;
	short			rectH, rectV;
	
	clipRgn = NewRgn();
	RectRgn(clipRgn, clippedRect);
	
	do
	{
		if (value & 1)						// pseudo-random # between 1 and 4095 
			value = (value >> 1) ^ mask;
		else
			value = (value >> 1);
		
		rectH = (value % 80) * 8;			// convert value into screen coords 
		rectV = ((value / 80) * 10) + clippedRect->top;
		SetRect(&transRect, rectH, rectV, rectH + 8, rectV + 10);
		
		if (isColor)						// copy bits within rect to mainWndo 
			CopyBits(&((GrafPtr)offCWorkPtr)->portBits, &(((GrafPtr)mainWndo)->portBits), 
					&transRect, &transRect, srcCopy, clipRgn);
		else
			CopyBits(&offWorkBits, &(mainWndo->portBits), &transRect, &transRect, 
					srcCopy, clipRgn);
	} while (value != 1);
	
	rectH = 0;								// handle special case for zero 
	rectV = clippedRect->top;
	SetRect(&transRect, rectH, rectV, rectH + 8, rectV + 10);
	if (isColor)
		CopyBits(&((GrafPtr)offCWorkPtr)->portBits, &(((GrafPtr)mainWndo)->portBits), 
				&transRect, &transRect, srcCopy, clipRgn);
	else
		CopyBits(&offWorkBits, &(mainWndo->portBits), &transRect, &transRect, 
				srcCopy, clipRgn);
	
	DisposeRgn(clipRgn);
}


//========================================================  DissBits12QD  

void DissBits12QD (Rect *clippedRect)

{
	Rect			transRect;
	RgnHandle		clipRgn;
	register short	value = 1;
	register short	mask = 0x0500;
	short			rectH, rectV;
	
	clipRgn = NewRgn();
	RectRgn(clipRgn, clippedRect);
	
	do
	{
		if (value & 1)						// pseudo-random # between 1 and 2047 
			value = (value >> 1) ^ mask;
		else
			value = (value >> 1);
		
		rectH = (value % 64) * 8;			// convert # into screen coords 
		rectV = ((value / 64) * 12) + clippedRect->top;
		SetRect(&transRect, rectH, rectV, rectH + 8, rectV + 12);
		
		if (isColor)						// copy bits within rect to mainWndo 
			CopyBits(&((GrafPtr)offCWorkPtr)->portBits, &(((GrafPtr)mainWndo)->portBits), 
					&transRect, &transRect, srcCopy, clipRgn);
		else
			CopyBits(&offWorkBits, &(mainWndo->portBits), &transRect, &transRect, 
					srcCopy, clipRgn);
	} while (value != 1);
	
	rectH = 0;								// handle special case for zero 
	rectV = clippedRect->top;
	SetRect(&transRect, rectH, rectV, rectH + 8, rectV + 12);
	if (isColor)
		CopyBits(&((GrafPtr)offCWorkPtr)->portBits, &(((GrafPtr)mainWndo)->portBits), 
				&transRect, &transRect, srcCopy, clipRgn);
	else
		CopyBits(&offWorkBits, &(mainWndo->portBits), &transRect, &transRect, 
				srcCopy, clipRgn);
	
	DisposeRgn(clipRgn);
}


//========================================================  DissBits13Assm4  

void DissBits13Assm4 (Rect *clippedRect)

{
	Point		zeroPt;
	long		screenOffset, workOffset;
	short		mask = 0x3500;
	short		value = 1;
	short		rectH, rectV, rowsThen;
	char		theMode;
	
	SetPt(&zeroPt, 0, 0);
	ShieldCursor(clippedRect, zeroPt);
	theMode = true32b;
	SwapMMUMode(&theMode);
	
	do
	{
		if (value & 1)						// produces # between 1 and 16383 
			value = (value >> 1) ^ mask;
		else
			value = (value >> 1);
		
		rectH = (value % 160) * 4;			// convert to screen coords 
		rectV = ((value / 160) * 5) + clippedRect->top;
		
		if (rectV > (clippedRect->bottom - 5))
		{
			rowsThen = clippedRect->bottom - rectV;
			
			if (rowsThen > 0)
			{
				workOffset = (long)((long)rectH >> 1) + workRowOffsets[rectV] + 
						(long)offWorkPix;
				screenOffset = (long)((long)rectH >> 1) + screenRowAddrs[rectV];
				
				asm 68000
				{
					move.l			workOffset, a0