mechcommander2/MCLib/vfx_transform.cpp

#include "vfx.h"

extern char AlphaTable[256*256];
extern enum { CPU_UNKNOWN, CPU_PENTIUM, CPU_MMX } Processor;
extern void memfill(void *Dest,int Length);
extern void memclear(void *Dest,int Length);

void CopySprite( PANE *pane, void *texture, int X, int Y, int Width, int Height, int Flip, int Shrink );
void AG_shape_fill (PANE *pane, void *shape_table,LONG shape_number, LONG hotX, LONG hotY);
void AG_shape_draw (PANE *pane, void *shape_table,LONG shape_number, LONG hotX, LONG hotY);
void AG_shape_translate_fill (PANE *pane, void *shape_table,LONG shape_number, LONG hotX, LONG hotY);
extern unsigned int lookaside;


int SqrtCount=0;


typedef unsigned int DWORD;
typedef struct
{

	DWORD	bounds;
	DWORD	origin;
	DWORD	xmin;
	DWORD	ymin;
	DWORD	xmax;
	DWORD	ymax;

} SHAPEHEADER;

//
// Sprite format
//
//
// Marker.
// 0			End of line
// 1			Skip next bytes
// Bit 0 = 0	Repeat next byte [7654321] times
// Bit 0 = 1	String packet [7654321] bytes
//

static unsigned int SourceWidth,tWidth,tHeight,DestWidth;			// Used for code optimizing
static _int64 xmask=-1;
static unsigned int tempXmax,tempXmin;
static unsigned int minX,minY,maxY,maxX,SkipLeft,NewWidth,StartofLine,StartofClip,EndofClip;
static unsigned int lines,paneX0,paneX1,paneY0,paneY1,SourcePointer,DestPointer;
static signed int X,Y,X1;

static PANE tempPANE;
static WINDOW tempWINDOW;



void AG_shape_transform( PANE *globalPane, void *shapeTable, LONG frameNum, LONG hotX, LONG hotY, void *tempBuffer, LONG reverse, LONG scaleUp )
{

	_asm{

	mov esi,shapeTable
	mov eax,frameNum

	mov ecx,[esi+eax*8+8]

	mov eax,[esi+ecx+SHAPEHEADER.xmax]
	mov ebx,[esi+ecx+SHAPEHEADER.xmin]
	mov X1,eax
	mov X,ebx
	sub eax,ebx
	inc eax
	mov maxX,eax

	mov eax,[esi+ecx+SHAPEHEADER.ymax]
	mov ebx,[esi+ecx+SHAPEHEADER.ymin]
	mov Y,ebx
	sub eax,ebx
	inc eax
	mov maxY,eax

	}


tempWINDOW.buffer=(UBYTE*)tempBuffer;
tempWINDOW.x_max=maxX-1;
tempWINDOW.y_max=maxY-1;
tempPANE.window=&tempWINDOW;
tempPANE.x0=0;
tempPANE.y0=0;
tempPANE.x1=maxX-1;
tempPANE.y1=maxY-1;

//-------------------------------------------------------------------------------------
// Some armor here.  We have still have a bug somewhere that trashes the shape by
// the time it gets here.  Armor against for now and make Fatal to try to track down!
#define MAX_X		360
#define MAX_Y		360

	if ((maxX * maxY) >= (MAX_Y * MAX_X))
	{
		return;
	}
//-------------------------------------------------------------------------------------

memclear(tempBuffer,maxX*maxY);

AG_shape_draw ( &tempPANE, shapeTable, frameNum, -X, -Y );

	if(scaleUp)
	{
		if(reverse)
			CopySprite( globalPane, tempBuffer, hotX-X1, hotY+Y, maxX, maxY, reverse, scaleUp );
		else
			CopySprite( globalPane, tempBuffer, hotX+X, hotY+Y, maxX, maxY, reverse, scaleUp );
	}
	else
	{
		if(reverse)
			CopySprite( globalPane, tempBuffer, hotX-(X1>>1), hotY+(Y>>1), maxX, maxY, reverse, scaleUp );
		else
			CopySprite( globalPane, tempBuffer, hotX+(X>>1), hotY+(Y>>1), maxX, maxY, reverse, scaleUp );
	}
}




void AG_shape_translate_transform( PANE *globalPane, void *shapeTable, LONG frameNum, LONG hotX, LONG hotY,void *tempBuffer, LONG reverse, LONG scaleUp )
{

	_asm{

	mov esi,shapeTable
	mov eax,frameNum

	mov ecx,[esi+eax*8+8]

	mov eax,[esi+ecx+SHAPEHEADER.xmax]
	mov ebx,[esi+ecx+SHAPEHEADER.xmin]
	mov X1,eax
	mov X,ebx
	sub eax,ebx
	inc eax
	mov maxX,eax

	mov eax,[esi+ecx+SHAPEHEADER.ymax]
	mov ebx,[esi+ecx+SHAPEHEADER.ymin]
	mov Y,ebx
	sub eax,ebx
	inc eax
	mov maxY,eax

	}


tempWINDOW.buffer=(UBYTE*)tempBuffer;
tempWINDOW.x_max=maxX-1;
tempWINDOW.y_max=maxY-1;
tempPANE.window=&tempWINDOW;
tempPANE.x0=0;
tempPANE.y0=0;
tempPANE.x1=maxX-1;
tempPANE.y1=maxY-1;

//-------------------------------------------------------------------------------------
// Some armor here.  We have still have a bug somewhere that trashes the shape by
// the time it gets here.  Armor against for now and make Fatal to try to track down!
#define MAX_X		360
#define MAX_Y		360

	if ((maxX * maxY) >= (MAX_Y * MAX_X))
	{
		return;
	}
//-------------------------------------------------------------------------------------

memclear(tempBuffer,maxX*maxY);

AG_shape_translate_fill ( &tempPANE, shapeTable, frameNum, -X, -Y );

	if(scaleUp)
	{
		if(reverse)
			CopySprite( globalPane, tempBuffer, hotX-X1, hotY+Y, maxX, maxY, reverse, scaleUp );
		else
			CopySprite( globalPane, tempBuffer, hotX+X, hotY+Y, maxX, maxY, reverse, scaleUp );
	}
	else
	{
		if(reverse)
			CopySprite( globalPane, tempBuffer, hotX-(X1>>1), hotY+(Y>>1), maxX, maxY, reverse, scaleUp );
		else
			CopySprite( globalPane, tempBuffer, hotX+(X>>1), hotY+(Y>>1), maxX, maxY, reverse, scaleUp );
	}
}








void CopySprite( PANE *pane, void *texture, int X, int Y, int Width, int Height, int Flip, int ScaleUp )
{
	DestWidth = pane->window->x_max+1;

	long paneX0 = (pane->x0 < 0) ? 0 : pane->x0;
	long paneY0 = (pane->y0 < 0) ? 0 : pane->y0;
	long paneX1 = (pane->x1 >= (long)DestWidth) ? pane->window->x_max : pane->x1;
	long paneY1 = (pane->y1 >= (pane->window->y_max+1)) ? pane->window->y_max : pane->y1;

	X+=paneX0;
	Y+=paneY0;

	SourcePointer = (unsigned int)texture;
	SourceWidth=Width;
	
	if( X<paneX0 )
	{
		if( ScaleUp )
		{
			Width-=paneX0-X;
			if(Flip)						// Zoomed IN
				SourcePointer-=paneX0-X;
			else
				SourcePointer+=paneX0-X;
		}
		else
		{
			Width-=(paneX0-X)*2;
			if(Flip)						// Zoomed OUT
				SourcePointer-=(paneX0-X)*2;
			else
				SourcePointer+=(paneX0-X)*2;
		}
		
		X=paneX0;
	}

	if( Y<paneY0 )
	{
		if( ScaleUp )
		{
			Height-=paneY0-Y;
			SourcePointer+=(paneY0-Y)*Width;
			Y=paneY0;
		}
		else
		{
			Height-=(paneY0-Y)*2;
			SourcePointer+=((paneY0-Y)*2)*Width;
			Y=paneY0;
		}
	}
		
	if( ScaleUp )
	{
		if( X+Width > (paneX1+1) )
		{
			Width= paneX1+1-X;
		}
	}
	else
	{
		if( X+(Width>>1) > (paneX1+1) )
		{
			Width= (paneX1+1-X)<<1;
		}
	}

	if( ScaleUp )
	{
		if( Y+Height > (paneY1+1) )
			Height= paneY1+1-Y;
	}
	else
	{
		if( Y+(Height>>1) > (paneY1+1) )
			Height= (paneY1+1-Y)<<1;
	}

	if ( ( X >= paneX1 ) ||
		 ( Y >= paneY1 ) ||
		 ( X <= (paneX0 - Width)) ||
		 ( Y <= (paneY0 - Height)) ||
		 (Width<=0)					||
		 (Height<=0))
		return;

	DestPointer = (unsigned int)pane->window->buffer + X + Y*DestWidth;

	tWidth=Width;
	tHeight=Height;

	_asm{

	push ebp
	mov eax,Flip
	mov ebx,ScaleUp
	
	test eax,eax
	jnz DoFlip
	test ebx,ebx
	jnz UnFlipNormal
;
; Not Flipped, Shrunk
;
	mov ebx,tHeight
	mov edi,DestPointer

	mov esi,SourcePointer
	mov ebp,tWidth

	shr ebx,1
	jz Done
	shr ebp,1
	jz Done

	xor eax,eax
	mov edx,ebp

tl0:
	mov al,[edi]
	inc edi

	mov ah,[esi]
	add esi,2

	mov cl,AlphaTable[eax]
	dec ebp

	mov [edi-1],cl
	jnz tl0

	mov ecx,DestWidth
	sub esi,edx

	sub esi,edx
	add edi,ecx

	sub edi,edx
	mov ecx,SourceWidth

	mov ebp,edx
	dec ebx

	lea esi,[esi+ecx*2]
	jnz tl0

	jmp Done
;
; Not flipped, not shrunk
;
UnFlipNormal:
	mov edi,DestPointer
	mov esi,SourcePointer
	mov ebx,tHeight
	mov ebp,tWidth
	xor eax,eax
	mov edx,ebp

tl1:
	mov al,[edi]
	inc edi

	mov ah,[esi]
	inc esi

	cmp ah,0
	je  SKIPME1

	//mov cl,AlphaTable[eax]
	mov [edi-1],ah

SKIPME1:
	dec ebp
	jnz tl1

	mov ecx,DestWidth
	sub edi,edx

	add edi,ecx
	mov ebp,edx

	sub esi,edx
	mov ecx,SourceWidth

	add esi,ecx
	dec ebx

	jnz tl1
	jmp Done


DoFlip:
	test ebx,ebx
	jnz FlipNormal
;
; Flipped, Shrunk
;
	mov ebp,tWidth
	mov ebx,tHeight

	shr ebp,1
	jz Done
	shr ebx,1
	jz Done

	mov eax,SourceWidth
	mov esi,SourcePointer

	mov edi,DestPointer
	mov edx,ebp

	lea esi,[esi+eax*2-1]
	xor eax,eax

tl2:
	mov al,[edi]
	inc edi

	mov ah,[esi]
	sub esi,2

	mov cl,AlphaTable[eax]
	dec ebp

	mov [edi-1],cl
	jnz tl2

	mov ecx,DestWidth
	mov ebp,edx

	add esi,edx
	add edi,ecx

	add esi,edx
	mov ecx,SourceWidth

	sub edi,edx
	dec ebx

	lea esi,[esi+ecx*2]
	jnz tl2

	jmp Done

;
; Flipped, not shrunk
;
FlipNormal:

	mov eax,SourceWidth
	mov esi,SourcePointer
	mov edi,DestPointer
	mov ebp,tWidth
	mov ebx,tHeight
	lea esi,[esi+eax-1]
	xor eax,eax
	mov edx,ebp

tl3:
	mov al,[edi]
	inc edi

	mov ah,[esi]
	dec esi

	cmp ah, 0
	je  SKIPME2
	//mov cl,AlphaTable[eax]

	mov [edi-1],ah

SKIPME2:
	dec ebp
	jnz tl3

	sub edi,edx
	mov ecx,DestWidth

	mov ebp,edx
	add edi,ecx

	mov ecx,SourceWidth
	add esi,edx

	add esi,ecx
	dec ebx

	jnz tl3

done:
	pop ebp
	}
	return;
}


















/*
;
; int cdecl VFX_shape_draw (PANE *panep, void *shape_table,
;                           long shape_number,int hotX, int hotY)
;
; This function clips and draws a shape to a pane.
; 
; The panep parameter specifies the pane.
;
; The shape parameter specifies the shape, which must be in VFX Shape format.
;
; The hotX and hotY parameters specify the location where the shape is to be
; drawn.  The shape's hot spot will end up at the specified location.
;
*/
void AG_shape_fill (PANE *pane, void *shape_table,LONG shape_number, LONG hotX, LONG hotY)
{
	_asm{
	mov edi,pane
	nop
;
; Clip left and right of clipping window
;
	mov ecx,[edi+PANE.x0]
	mov edx,[edi+PANE.y0]

	mov ebx,ecx
	mov eax,edx

	sar ebx,31
	xor eax,-1

	sar eax,31				; If less than 0, make 0
	xor ebx,-1

	and ecx,ebx
	and edx,eax

	mov paneX0,ecx
	mov paneY0,edx

;
; Clip top and bottom of clipping window
;
	mov ecx,[edi+PANE.x1]
	mov edx,[edi+PANE.y1]

	mov edi,[edi+PANE.window]
	mov esi,shape_table

	mov eax,[edi+WINDOW.x_max]
	xor ebx,ebx

	inc eax
	nop

	sub ecx,eax
	mov DestWidth,eax

	setge bl

	dec ebx					; if ecx is less than eax, load ecx with eax
	nop

	and ecx,ebx
	mov ebx,[edi+WINDOW.y_max]

	add ecx,eax
	inc ebx

	xor eax,eax
	sub edx,ebx

	setge al

	dec eax
	mov paneX1,ecx
	
	and edx,eax
	mov eax,shape_number

	add edx,ebx
	mov ebx,paneY0

;
; paneX0,Y0 to PaneX1,Y1 are 0,0 -> 639,479 or window size to render too
;
	mov ecx,[esi+eax*8+8]	; ESI now points to start of sprite data
	mov paneY1,edx

	lea esi,[esi+ecx+SIZE SHAPEHEADER]
	mov edx,hotY

	mov ecx,[esi+SHAPEHEADER.xmax-SIZE SHAPEHEADER]
	mov eax,[esi+SHAPEHEADER.xmin-SIZE SHAPEHEADER]

	mov tempXmax,ecx					; Store Xmax and Xmin
	mov tempXmin,eax

	mov ecx,[esi+SHAPEHEADER.ymax-SIZE SHAPEHEADER]
	mov eax,[esi+SHAPEHEADER.ymin-SIZE SHAPEHEADER]

	sub ecx,eax							; ecx = Height of sprite
	add eax,edx							; eax = top line

	inc ecx								; Add one line
	nop
;
; Now check for lines off the top of the clipping window
;
	cmp eax,ebx
	jl ClippedTop

;
; Now check for lines off the bottom of the clipping window
;
rw5:
	lea ebx,[eax+ecx-1]					; ebx=Last Line
	nop

	sub ebx,paneY1						; Check to see if off bottom
	ja ClippedBottom
rw6:
	mov lines,ecx						; eax still equals top line

;
; Now check clipping in X
;
	mov ebx,tempXmax

	mov ecx,tempXmin
	mov edx,paneX0

	sub ebx,ecx							; ebx = Width of sprite
	add ecx,hotX						; ecx = offset to left edge

	cmp ecx,edx							; Is sprite off left edge of screen?
	jl ClippedLeft

	lea edx,[ebx+ecx-1]
	mov edi,[edi+WINDOW.buffer]			; edi points to top left of buffer

	sub edx,paneX1
	jnbe ClippedRight

;
; Work out screen position
;
//NowDraw:
	imul DestWidth

	add eax,ecx
	xor ecx,ecx

	add edi,eax
	mov StartofLine,edi

;
;
; Main drawing loop
;
;
lineLoop:
	mov al,[esi]
	inc esi
	shr al,1
	ja RunPacket
	jnz StringPacket
	jnc EndPacket

//SkipPacket:
	xor ecx,ecx
	mov al,[esi]
	inc esi
	xor cl,cl
rp1a:
	mov [edi],cl		;Fill with 0 instead of skipping
	inc edi
	dec al
	jnz rp1a
	jmp lineLoop

	jmp RunPacket		; Alignement problem with rp1 otherwise

RunPacket:
	mov cl,[esi]
	inc esi
rp1:
	mov [edi],cl
	inc edi
	dec al
	jnz rp1
	jmp lineLoop

StringPacket:
//
// 17 cycles / 8 bytes   - 2.125 per byte
//
	sub al,8
	jc sp2
sp1:
	mov ecx,[esi]
	mov ebx,[esi+4]

	mov [edi],ecx
	mov [edi+4],ebx

	add esi,8
	add edi,8

	sub al,8
	jnc sp1

sp2:
	add al,8
	jz lineLoop

sp3:
	mov cl,[esi]
	inc esi

	mov [edi],cl
	inc edi

	dec al
	jnz sp3
	jmp lineLoop

EndPacket:
	mov edx,DestWidth
	mov edi,StartofLine

	add edi,edx
	mov edx,lines

	dec edx
	mov StartofLine,edi

	mov lines,edx
	jnz lineLoop
	jmp Exit




;
;
; Lines are clipped off the bottom of the clip window
;
;
ClippedBottom:
	sub ecx,ebx							; Remove lines that go off bottom
	jbe Exit
	jmp rw6
;
;
; Lines are off the top of the clip window
;
;
ClippedTop:
	sub ebx,eax							; ebx=Lines to skip
	xor eax,eax
	sub ecx,ebx							; ecx=Lines in sprite
	jbe Exit							; Off top of screen
rw8:
	mov al,[esi]
	add esi,2
	shr al,1
	ja rw8
	jnz rw8StringPacket					; Skip over lines in sprite data
	jc rw8
	dec esi
	dec ebx
	jnz rw8
	mov eax,paneY0						; eax=top line
	jmp rw5
rw8StringPacket:
	lea esi,[esi+eax-1]
	jmp rw8
;
;
; Sprite is clipped on either left or right
;
;
ClippedLeft:
	sub edx,ecx
	mov edi,[edi+WINDOW.buffer]			; edi points to top left of buffer
	cmp ebx,edx
	jbe Exit							; Completly off left of screen?
	jmp ClippedX

ClippedRight:
	cmp ecx,edx							; Completly off right of screen?
	jbe Exit

ClippedX:
	imul DestWidth

	add edi,eax
	mov eax,paneX0

	mov edx,paneX1
	add eax,edi

	add edx,edi							; eax=Last pixel on right edge of clip window
	mov StartofClip,eax

	mov EndofClip,edx
	add edi,ecx

	xor ecx,ecx
	mov StartofLine,edi

;
; Clipped left and/or right drawing loop
;
clineLoop:
	mov al,[esi]
	inc esi
	shr al,1
	ja cRunPacket
	jnz cStringPacket
	jnc cEndPacket


//cSkipPacket:
	xor ecx,ecx
	mov al,[esi]
	inc esi
	xor cl,cl
crp1a:
	cmp edi,StartofClip
	jc crp2a
	cmp edi,EndofClip
	jnbe clineLoop
	mov [edi],cl
crp2a:
	inc edi
	dec al
	jnz crp1a
	jmp clineLoop


cRunPacket:
	mov cl,[esi]
	inc esi
crp1:
	cmp edi,StartofClip
	jc crp2
	cmp edi,EndofClip
	jnbe clineLoop
	mov [edi],cl
crp2:
	inc edi
	dec al
	jnz crp1
	jmp clineLoop


cStringPacket:
	mov cl,[esi]
	inc esi
	cmp edi,StartofClip
	jc crp3
	cmp edi,EndofClip
	jnbe crp3a
	mov [edi],cl
crp3:
	inc edi
	dec al
	jnz cStringPacket
	jmp clineLoop

crp3a:
	and eax,255
	lea esi,[esi+eax-1]
	jmp clineLoop


cEndPacket:
	mov edx,DestWidth
	mov eax,EndofClip

	add eax,edx
	mov edi,StartofLine

	mov EndofClip,eax
	nop

	mov eax,StartofClip
	add edi,edx

	add eax,edx
	mov edx,lines

	mov StartofLine,edi
	dec edx

	mov StartofClip,eax
	mov lines,edx

	jnz clineLoop

Exit:       
	}
}












/*
;----------------------------------------------------------------------------
;
; int cdecl VFX_shape_translate_draw (PANE *panep, void *shape_table,
;                           long shape_number,int hotX, int hotY)
;
; This function clips and draws a shape to a pane.  It is identical to 
; VFX_shape_draw(), except that each pixel written is translated through a
; 256-byte table which was specified by a prior call to VFX_shape_lookaside().
; 
; The panep parameter specifies the pane.
;
; The shape parameter specifies the shape, which must be in VFX Shape format.
;
; The hotX and hotY parameters specify the location where the shape is to be
; drawn.  The shape's hot spot will end up at the specified location.
;
; For more information, see the "VFX Shape Format Description".
;
; Return values:
;
;    0: OK
;   -1: Bad window
;   -2: Bad pane
;   -3: Shape off pane
;   -4: Null shape
;
;----------------------------------------------------------------------------
*/
void AG_shape_translate_fill (PANE *pane, void *shape_table,LONG shape_number, LONG hotX, LONG hotY)
{
	_asm{
	mov edi,pane
	nop
;
; Clip left and right of clipping window
;
	mov ecx,[edi+PANE.x0]
	mov edx,[edi+PANE.y0]

	mov ebx,ecx
	mov eax,edx

	sar ebx,31
	xor eax,-1

	sar eax,31				; If less than 0, make 0
	xor ebx,-1

	and ecx,ebx
	and edx,eax

	mov paneX0,ecx
	mov paneY0,edx

;
; Clip top and bottom of clipping window
;
	mov ecx,[edi+PANE.x1]
	mov edx,[edi+PANE.y1]

	mov edi,[edi+PANE.window]
	mov esi,shape_table

	mov eax,[edi+WINDOW.x_max]
	xor ebx,ebx

	inc eax
	nop

	sub ecx,eax
	mov DestWidth,eax

	setge bl

	dec ebx					; if ecx is less than eax, load ecx with eax
	nop

	and ecx,ebx
	mov ebx,[edi+WINDOW.y_max]

	add ecx,eax
	inc ebx

	xor eax,eax
	sub edx,ebx

	setge al

	dec eax
	mov paneX1,ecx
	
	and edx,eax
	mov eax,shape_number

	add edx,ebx
	mov ebx,paneY0

;
; paneX0,Y0 to PaneX1,Y1 are 0,0 -> 639,479 or window size to render too
;
	mov ecx,[esi+eax*8+8]	; ESI now points to start of sprite data
	mov paneY1,edx

	lea esi,[esi+ecx+SIZE SHAPEHEADER]
	mov edx,hotY

	mov ecx,[esi+SHAPEHEADER.xmax-SIZE SHAPEHEADER]
	mov eax,[esi+SHAPEHEADER.xmin-SIZE SHAPEHEADER]

	mov tempXmax,ecx					; Store Xmax and Xmin
	mov tempXmin,eax

	mov ecx,[esi+SHAPEHEADER.ymax-SIZE SHAPEHEADER]
	mov eax,[esi+SHAPEHEADER.ymin-SIZE SHAPEHEADER]

	sub ecx,eax							; ecx = Height of sprite
	add eax,edx							; eax = top line

	inc ecx								; Add one line
	nop
;
; Now check for lines off the top of the clipping window
;
	cmp eax,ebx
	jl ClippedTop

;
; Now check for lines off the bottom of the clipping window
;
rw5:
	lea ebx,[eax+ecx-1]					; ebx=Last Line
	nop

	sub ebx,paneY1						; Check to see if off bottom
	ja ClippedBottom
rw6:
	mov lines,ecx						; eax still equals top line

;
; Now check clipping in X
;
	mov ebx,tempXmax

	mov ecx,tempXmin
	mov edx,paneX0

	sub ebx,ecx							; ebx = Width of sprite
	add ecx,hotX						; ecx = offset to left edge

	cmp ecx,edx							; Is sprite off left edge of screen?
	jl ClippedLeft

	lea edx,[ebx+ecx-1]
	mov edi,[edi+WINDOW.buffer]			; edi points to top left of buffer

	sub edx,paneX1
	jnc ClippedRight

;
; Work out screen position
;
//NowDraw:
	imul DestWidth

	add eax,ecx
	xor ecx,ecx

	add edi,eax
	mov StartofLine,edi

	push ebp
	mov ebp,lookaside

	xor ebx,ebx
	nop
;
; Main drawing loop
;
;
lineLoop:
	mov al,[esi]
	inc esi
	shr al,1
	ja RunPacket
	jnz StringPacket
	jnc EndPacket

//SkipPacket:
	xor ecx,ecx
	mov al,[esi]
	inc esi
	xor cl,cl
rp1a:
	mov [edi],cl
	inc edi
	dec al
	jnz rp1a
	jmp lineLoop

RunPacket:
	xor ecx,ecx
	mov cl,[esi]
	inc esi
	mov cl,[ecx+ebp]
rp1:
	mov [edi],cl
	inc edi
	dec al
	jnz rp1
	jmp lineLoop

StringPacket:
//
// 17 cycles / 8 bytes   - 2.125 per byte
//
	sub al,8
	jc sp2
sp1:
	mov cl,[esi]
	mov bl,[esi+4]

	mov cl,[ecx+ebp]
	mov bl,[ebx+ebp]

	mov [edi],cl
	mov [edi+4],bl

	mov cl,[esi+1]
	mov bl,[esi+5]

	mov cl,[ecx+ebp]
	mov bl,[ebx+ebp]

	mov [edi+1],cl
	mov [edi+5],bl

	mov cl,[esi+2]
	mov bl,[esi+6]

	mov cl,[ecx+ebp]
	mov bl,[ebx+ebp]

	mov [edi+2],cl
	mov [edi+6],bl

	mov cl,[esi+3]
	mov bl,[esi+7]

	add esi,8
	add edi,8

	mov cl,[ecx+ebp]
	mov bl,[ebx+ebp]

	mov [edi+3-8],cl
	mov [edi+7-8],bl

	sub al,8
	jnc sp1

sp2:
	add al,8
	jz lineLoop

sp3:
	xor ecx,ecx
	mov cl,[esi]

	mov cl,[ecx+ebp]
	inc esi

	mov [edi],cl
	inc edi

	dec al
	jnz sp3
	jmp lineLoop

EndPacket:
	mov edx,DestWidth
	mov edi,StartofLine

	add edi,edx
	mov edx,lines

	dec edx
	mov StartofLine,edi

	mov lines,edx
	jnz lineLoop

	pop ebp
	jmp Exit




;
;
; Lines are clipped off the bottom of the clip window
;
;
ClippedBottom:
	sub ecx,ebx							; Remove lines that go off bottom
	jbe Exit
	jmp rw6
;
;
; Lines are off the top of the clip window
;
;
ClippedTop:
	sub ebx,eax							; ebx=Lines to skip
	xor eax,eax
	sub ecx,ebx							; ecx=Lines in sprite
	jbe Exit							; Off top of screen
rw8:
	mov al,[esi]
	add esi,2
	shr al,1
	ja rw8
	jnz rw8StringPacket					; Skip over lines in sprite data
	jc rw8
	dec esi
	dec ebx
	jnz rw8
	mov eax,paneY0						; eax=top line
	jmp rw5
rw8StringPacket:
	lea esi,[esi+eax-1]
	jmp rw8
;
;
; Sprite is clipped on either left or right
;
;
ClippedLeft:
	sub edx,ecx
	mov edi,[edi+WINDOW.buffer]			; edi points to top left of buffer
	cmp ebx,edx
	jbe Exit							; Completly off left of screen?
	jmp ClippedX

ClippedRight:
	cmp ecx,edx							; Completly off right of screen?
	jbe Exit

ClippedX:
	imul DestWidth

	add edi,eax
	mov eax,paneX0

	mov edx,paneX1
	add eax,edi

	add edx,edi							; eax=Last pixel on right edge of clip window
	mov StartofClip,eax

	mov EndofClip,edx
	add edi,ecx

	xor ecx,ecx
	mov StartofLine,edi

	push ebp
	mov ebp,lookaside
;
; Clipped left and/or right drawing loop
;
clineLoop:
	mov al,[esi]
	inc esi
	shr al,1
	ja cRunPacket
	jnz cStringPacket
	jnc cEndPacket


//cSkipPacket:
	mov al,[esi]
	inc esi
	xor cl,cl
crp1a:
	cmp edi,StartofClip
	jc crp2a
	cmp edi,EndofClip
	jnc clineLoop
	mov [edi],cl
crp2a:
	inc edi
	dec al
	jnz crp1a
	jmp clineLoop


cRunPacket:
	mov cl,[esi]
	inc esi
crp1:
	cmp edi,StartofClip
	jc crp2
	cmp edi,EndofClip
	jnc clineLoop
	mov cl,[ecx+ebp]
	mov [edi],cl
crp2:
	inc edi
	dec al
	jnz crp1
	jmp clineLoop


cStringPacket:
	mov cl,[esi]
	inc esi
	cmp edi,StartofClip
	jc crp3
	cmp edi,EndofClip
	jnc crp3a
	mov cl,[ecx+ebp]
	mov [edi],cl
crp3:
	inc edi
	dec al
	jnz cStringPacket
	jmp clineLoop

crp3a:
	and eax,255
	lea esi,[esi+eax-1]
	jmp clineLoop


cEndPacket:
	mov edx,DestWidth
	mov eax,EndofClip

	add eax,edx
	mov edi,StartofLine

	mov EndofClip,eax
	nop

	mov eax,StartofClip
	add edi,edx

	add eax,edx
	mov edx,lines

	mov StartofLine,edi
	dec edx

	mov StartofClip,eax
	mov lines,edx

	jnz clineLoop
	pop ebp

Exit:       
	}
}