/* $XFree86: xc/programs/Xserver/hw/xfree86/xaa/xaaBitmap.c,v 1.9 2000/06/29 10:55:41 alanh Exp $ */


#include "xaa.h"
#include "xaalocal.h"
#include "xaacexp.h"
#include "xf86.h"
#include "xf86_ansic.h"



/********** byte swapping ***************/


#ifdef FIXEDBASE
# define DEST(i)	*dest
# define RETURN(i)	return(dest)
#else
# define DEST(i)	dest[i]
# define RETURN(i)	return(dest + i)
#endif

#ifdef MSBFIRST
# define SOURCE(i)	SWAP_BITS_IN_BYTES(src[i])
#else
# define SOURCE(i)	src[i]
#endif


typedef CARD32 *(* BitmapScanlineProcPtr)(CARD32 *, CARD32 *, int, int);

#ifdef TRIPLE_BITS
static CARD32*
BitmapScanline(
   CARD32 *src, CARD32 *base,
   int count, int skipleft )
{
     CARD32 bits;

     while(count >= 3) {
	bits = *src;
	WRITE_BITS3(bits);
	src++;
	count -= 3;
     }
     if (count == 2) {
	bits = *src;
	WRITE_BITS2(bits);
     } else if (count == 1) {
	bits = *src;
	WRITE_BITS1(bits);
     }
     
     return base;
}

static CARD32*
BitmapScanline_Inverted(
   CARD32 *src, CARD32 *base,
   int count, int skipleft )
{
     CARD32 bits;

     while(count >= 3) {
	bits = ~(*src);
	WRITE_BITS3(bits);
	src++;
	count -= 3;
     }
     if (count == 2) {
	bits = ~(*src);
	WRITE_BITS2(bits);
     } else if (count == 1) {
	bits = ~(*src);
	WRITE_BITS1(bits);
     }
     
     return base;
}


static CARD32*
BitmapScanline_Shifted(
   CARD32 *src, CARD32 *base,
   int count, int skipleft )
{
     CARD32 bits;

     while(count >= 3) {
	bits = SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft));
	WRITE_BITS3(bits);
	src++;
	count -= 3;
     }
     if (count == 2) {
	bits = SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft));
	WRITE_BITS2(bits);
     } else if (count == 1) {
	bits = SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft));
	WRITE_BITS1(bits);
     }
     
     return base;
}

static CARD32*
BitmapScanline_Shifted_Inverted(
   CARD32 *src, CARD32 *base,
   int count, int skipleft )
{
     CARD32 bits;

     while(count >= 3) {
	bits = ~(SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft)));
	WRITE_BITS3(bits);
	src++;
	count -= 3;
     }
     if (count == 2) {
	bits = ~(SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft)));
	WRITE_BITS2(bits);
     } else if (count == 1) {
	bits = ~(SHIFT_R(*src,skipleft) | SHIFT_L(*(src + 1),(32 - skipleft)));
	WRITE_BITS1(bits);
     }
     
     return base;
}

#define BitmapScanline_Shifted_Careful BitmapScanline_Shifted
#define BitmapScanline_Shifted_Inverted_Careful BitmapScanline_Shifted_Inverted

#else
static CARD32*
BitmapScanline(
   CARD32 *src, CARD32 *dest,
   int count, int skipleft )
{
   while(count >= 4) {
	DEST(0) = SOURCE(0);
	DEST(1) = SOURCE(1);
	DEST(2) = SOURCE(2);
	DEST(3) = SOURCE(3);
	count -= 4;
	src += 4;
#ifndef FIXEDBASE
	dest += 4;
#endif
   }
   
   if(!count) return dest;
   DEST(0) = SOURCE(0);
   if(count == 1) RETURN(1);
   DEST(1) = SOURCE(1);
   if(count == 2) RETURN(2);
   DEST(2) = SOURCE(2);
   RETURN(3);
}

static CARD32*
BitmapScanline_Inverted(
   CARD32 *src, CARD32 *dest,
   int count, int skipleft )
{
   while(count >= 4) {
	DEST(0) = ~SOURCE(0);
	DEST(1) = ~SOURCE(1);
	DEST(2) = ~SOURCE(2);
	DEST(3) = ~SOURCE(3);
	count -= 4;
	src += 4;
#ifndef FIXEDBASE
	dest += 4;
#endif
   }
   
   if(!count) return dest;
   DEST(0) = ~SOURCE(0);
   if(count == 1) RETURN(1);
   DEST(1) = ~SOURCE(1);
   if(count == 2) RETURN(2);
   DEST(2) = ~SOURCE(2);
   RETURN(3);
}


static CARD32*
BitmapScanline_Shifted(
   CARD32 *bits, CARD32 *base,
   int count, int skipleft )
{
     while(count--) {
	register CARD32 tmp = SHIFT_R(*bits,skipleft) | 
			      SHIFT_L(*(bits + 1),(32 - skipleft));
	WRITE_BITS(tmp);
	bits++;
     }
     return base;
}

static CARD32*
BitmapScanline_Shifted_Inverted(
   CARD32 *bits, CARD32 *base,
   int count, int skipleft )
{
     while(count--) {
	register CARD32 tmp = ~(SHIFT_R(*bits,skipleft) | 
				SHIFT_L(*(bits + 1),(32 - skipleft)));
	WRITE_BITS(tmp);
	bits++;
     }
     return base;
}

static CARD32*
BitmapScanline_Shifted_Careful(
   CARD32 *bits, CARD32 *base,
   int count, int skipleft )
{
     register CARD32 tmp;
     while(--count) {
 	tmp = SHIFT_R(*bits,skipleft) | SHIFT_L(*(bits + 1),(32 - skipleft));
	WRITE_BITS(tmp);
	bits++;
     }
     tmp = SHIFT_R(*bits,skipleft);
     WRITE_BITS(tmp);

     return base;
}

static CARD32*
BitmapScanline_Shifted_Inverted_Careful(
   CARD32 *bits, CARD32 *base,
   int count, int skipleft )
{
     register CARD32 tmp;
     while(--count) {
	tmp = ~(SHIFT_R(*bits,skipleft) | SHIFT_L(*(bits + 1),(32 - skipleft)));
	WRITE_BITS(tmp);
	bits++;
     }
     tmp = ~(SHIFT_R(*bits,skipleft));
     WRITE_BITS(tmp);
     return base;
}

#endif

/*  
    When the accelerator is TRANSPARENCY_ONLY, WriteBitmap can do
    the fill in two passes, inverting the source on the second pass.  
    For GXcopy we can fill the backing rectangle as a solid rect and
    avoid the invert.
*/ 

void
#ifdef TRIPLE_BITS
EXPNAME(XAAWriteBitmapColorExpand3)(
#else
EXPNAME(XAAWriteBitmapColorExpand)(
#endif
    ScrnInfoPtr pScrn,
    int x, int y, int w, int H,
    unsigned char *src,
    int srcwidth,
    int skipleft,
    int fg, int bg,
    int rop,
    unsigned int planemask 
)
{
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);
    CARD32* base;
    unsigned char *srcp = src;
    int SecondPassColor = -1;
    int shift = 0, dwords;
    BitmapScanlineProcPtr firstFunc;
    BitmapScanlineProcPtr secondFunc;
    int flag;
    int h = H;

#ifdef TRIPLE_BITS
    if((bg != -1) && 
	((infoRec->CPUToScreenColorExpandFillFlags & TRANSPARENCY_ONLY) ||
	((infoRec->CPUToScreenColorExpandFillFlags & RGB_EQUAL) && 
	(!CHECK_RGB_EQUAL(bg))))) {
#else
    if((bg != -1) && 
	(infoRec->CPUToScreenColorExpandFillFlags & TRANSPARENCY_ONLY)) {
#endif
	if((rop == GXcopy) && infoRec->SetupForSolidFill) {
    	    (*infoRec->SetupForSolidFill)(pScrn, bg, rop, planemask);
            (*infoRec->SubsequentSolidFillRect)(pScrn, x, y, w, h);
	} else SecondPassColor = bg;
	bg = -1;
    }

#ifdef TRIPLE_BITS
    if(skipleft) {
#else
    if(skipleft && 
	(!(infoRec->CPUToScreenColorExpandFillFlags & LEFT_EDGE_CLIPPING) || 
	(!(infoRec->CPUToScreenColorExpandFillFlags & LEFT_EDGE_CLIPPING_NEGATIVE_X) && 
		(skipleft > x)))) {
#endif
	if((skipleft + ((w + 31) & ~31)) > ((skipleft + w + 31) & ~31)) {
	    /* don't read past the end */
	    firstFunc = BitmapScanline_Shifted_Careful;
 	    secondFunc = BitmapScanline_Shifted_Inverted_Careful;
	} else {
	    firstFunc = BitmapScanline_Shifted;
 	    secondFunc = BitmapScanline_Shifted_Inverted;
	}
	shift = skipleft;
	skipleft = 0;
    } else {
	firstFunc = BitmapScanline;
 	secondFunc = BitmapScanline_Inverted;
	w += skipleft;
	x -= skipleft;
    }

#ifdef TRIPLE_BITS
    dwords = (3 * w + 31) >> 5;
#else
    dwords = (w + 31) >> 5;
#endif

SECOND_PASS:

    flag = (infoRec->CPUToScreenColorExpandFillFlags 
	     & CPU_TRANSFER_PAD_QWORD) && ((dwords * h) & 0x01);
    (*infoRec->SetupForCPUToScreenColorExpandFill)(
					pScrn, fg, bg, rop, planemask);
    (*infoRec->SubsequentCPUToScreenColorExpandFill)(
					pScrn, x, y, w, h, skipleft);

    base = (CARD32*)infoRec->ColorExpandBase;

#ifndef FIXEDBASE
    if((dwords * h) <= infoRec->ColorExpandRange)
	while(h--) {
	    base = (*firstFunc)((CARD32*)srcp, base, dwords, shift);
	    srcp += srcwidth;
    	}
    else
#endif
	while(h--) {
	    (*firstFunc)((CARD32*)srcp, base, dwords, shift);
	    srcp += srcwidth;
	}

    if(flag){
        base = (CARD32*)infoRec->ColorExpandBase;
	base[0] = 0x00000000;
    }

    if(SecondPassColor != -1) {
	h = H; /* Reset height */
	fg = SecondPassColor;
	SecondPassColor = -1;
	firstFunc = secondFunc;
	srcp = src;
	goto SECOND_PASS;
    }

    if(infoRec->CPUToScreenColorExpandFillFlags & SYNC_AFTER_COLOR_EXPAND) 
	(*infoRec->Sync)(pScrn);
    else SET_SYNC_FLAG(infoRec);
}

#ifndef FIXEDBASE

void
#ifdef TRIPLE_BITS
EXPNAME(XAAWriteBitmapScanlineColorExpand3)(
#else
EXPNAME(XAAWriteBitmapScanlineColorExpand)(
#endif
    ScrnInfoPtr pScrn,
    int x, int y, int w, int h,
    unsigned char *src,
    int srcwidth,
    int skipleft,
    int fg, int bg,
    int rop,
    unsigned int planemask 
)
{
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCRNINFOPTR(pScrn);
    CARD32* base;
    unsigned char *srcp = src;
    int SecondPassColor = -1;
    int shift = 0, dwords, bufferNo;
    BitmapScanlineProcPtr firstFunc;
    BitmapScanlineProcPtr secondFunc;

#ifdef TRIPLE_BITS
    if((bg != -1) &&
	((infoRec->ScanlineCPUToScreenColorExpandFillFlags & TRANSPARENCY_ONLY) 
	|| ((infoRec->ScanlineCPUToScreenColorExpandFillFlags & RGB_EQUAL) && 
	(!CHECK_RGB_EQUAL(bg))))) {
#else
    if((bg != -1) && 
	(infoRec->ScanlineCPUToScreenColorExpandFillFlags & TRANSPARENCY_ONLY)){
#endif
	if((rop == GXcopy) && infoRec->SetupForSolidFill) {
    	    (*infoRec->SetupForSolidFill)(pScrn, bg, rop, planemask);
            (*infoRec->SubsequentSolidFillRect)(pScrn, x, y, w, h);
	} else SecondPassColor = bg;
	bg = -1;
    }

#ifdef TRIPLE_BITS
    if(skipleft) {
#else
    if(skipleft && 
	(!(infoRec->ScanlineCPUToScreenColorExpandFillFlags & 
		LEFT_EDGE_CLIPPING) || 
	(!(infoRec->ScanlineCPUToScreenColorExpandFillFlags &
		 LEFT_EDGE_CLIPPING_NEGATIVE_X) && (skipleft > x)))) {
#endif
	if((skipleft + ((w + 31) & ~31)) > ((skipleft + w + 31) & ~31)) {
	    /* don't read past the end */
	    firstFunc = BitmapScanline_Shifted_Careful;
 	    secondFunc = BitmapScanline_Shifted_Inverted_Careful;
	} else {
	    firstFunc = BitmapScanline_Shifted;
 	    secondFunc = BitmapScanline_Shifted_Inverted;
	}
	shift = skipleft;
	skipleft = 0;
    } else {
	firstFunc = BitmapScanline;
 	secondFunc = BitmapScanline_Inverted;
	w += skipleft;
	x -= skipleft;
    }

#ifdef TRIPLE_BITS
    dwords = (3 * w + 31) >> 5;
#else
    dwords = (w + 31) >> 5;
#endif

SECOND_PASS:

    (*infoRec->SetupForScanlineCPUToScreenColorExpandFill)(pScrn, fg, bg, rop, planemask);
    (*infoRec->SubsequentScanlineCPUToScreenColorExpandFill)(
					pScrn, x, y, w, h, skipleft);

    bufferNo = 0;

    while(h--) {
	base = (CARD32*)infoRec->ScanlineColorExpandBuffers[bufferNo];
	(*firstFunc)((CARD32*)srcp, base, dwords, shift);
	(*infoRec->SubsequentColorExpandScanline)(pScrn, bufferNo++);
	srcp += srcwidth;
	if(bufferNo >= infoRec->NumScanlineColorExpandBuffers)
	    bufferNo = 0;
    }

    if(SecondPassColor != -1) {
	fg = SecondPassColor;
	SecondPassColor = -1;
	firstFunc = secondFunc;
	srcp = src;
	goto SECOND_PASS;
    }

    SET_SYNC_FLAG(infoRec);
}

#endif
