vgavideo.h File Reference

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Classes
struct	_VideoMode

Macros
#define	SCREEN_X   640
#define	SCREEN_Y   480
#define	SCREEN_STRIDE   80
#define	VGA_NORMAL   0
#define	VGA_AND   8
#define	VGA_OR   16
#define	VGA_XOR   24
#define	MISC   0x3c2
#define	SEQ   0x3c4
#define	CRTC   0x3d4
#define	GRAPHICS   0x3ce
#define	FEATURE   0x3da
#define	ATTRIB   0x3c0
#define	STATUS   0x3da
#define	SEQ_I   0x3C4 /* Sequencer Index */
#define	SEQ_D   0x3C5 /* Sequencer Data Register */
#define	GRA_I   0x3CE /* Graphics Controller Index */
#define	GRA_D   0x3CF /* Graphics Controller Data Register */
#define	LowByte(w)   (*((unsigned char *)&(w) + 0))
#define	HighByte(w)   (*((unsigned char *)&(w) + 1))
#define	ASSIGNVP4(x, y, vp)   vp = vidmem /* VBUF */ + (((x) + (y)*SCREEN_X) >> 3);
#define	ASSIGNMK4(x, y, mask)   mask = 0x80 >> ((x) & 7);
#define	mod8(n)   ((n)&7)
#define	mod2(n)   ((n)&1)

Typedefs
typedef struct _VideoMode	VideoMode

Functions
VOID	vgaPreCalc (VOID)
VOID	vgaPutPixel (INT x, INT y, UCHAR c)
VOID	vgaPutByte (INT x, INT y, UCHAR c)
VOID	vgaGetByte (ULONG offset, UCHAR *b, UCHAR *g, UCHAR *r, UCHAR *i)
INT	vgaGetPixel (INT x, INT y)
BOOL	vgaHLine (INT x, INT y, INT len, UCHAR c)
BOOL	vgaVLine (INT x, INT y, INT len, UCHAR c)
INT __cdecl	abs (INT nm)
BOOL	VGADDIIntersectRect (PRECTL prcDst, PRECTL prcSrc1, PRECTL prcSrc2)
void	get_masks (int x, int w)
void	DIB_BltFromVGA (int x, int y, int w, int h, void *b, int Dest_lDelta)
void	DIB_BltToVGA (int x, int y, int w, int h, void *b, int Source_lDelta, int StartMod)
void	DIB_BltToVGAWithXlate (int x, int y, int w, int h, void *b, int Source_lDelta, XLATEOBJ *Xlate)
void	DIB_TransparentBltToVGA (int x, int y, int w, int h, void *b, int Source_lDelta, ULONG trans)

Variables
int	maskbit [640]
int	y80 [480]
int	xconv [640]
int	bit8 [640]
int	startmasks [8]
int	endmasks [8]
UCHAR	PreCalcReverseByte [256]
PBYTE	vidmem

Macro Definition Documentation

ASSIGNMK4

#define ASSIGNMK4	(		x,
			y,
			mask
	)		mask = 0x80 >> ((x) & 7);

Definition at line 66 of file vgavideo.h.

ASSIGNVP4

#define ASSIGNVP4	(		x,
			y,
			vp
	)		vp = vidmem /* VBUF */ + (((x) + (y)*SCREEN_X) >> 3);

Definition at line 65 of file vgavideo.h.

ATTRIB

#define ATTRIB   0x3c0

Definition at line 31 of file vgavideo.h.

CRTC

#define CRTC   0x3d4

Definition at line 28 of file vgavideo.h.

FEATURE

#define FEATURE   0x3da

Definition at line 30 of file vgavideo.h.

GRA_D

#define GRA_D   0x3CF /* Graphics Controller Data Register */

Definition at line 60 of file vgavideo.h.

GRA_I

#define GRA_I   0x3CE /* Graphics Controller Index */

Definition at line 59 of file vgavideo.h.

GRAPHICS

#define GRAPHICS   0x3ce

Definition at line 29 of file vgavideo.h.

HighByte

#define HighByte

(

w

)

(*((unsigned char *)&(w) + 1))

Definition at line 63 of file vgavideo.h.

LowByte

#define LowByte

(

w

)

(*((unsigned char *)&(w) + 0))

Definition at line 62 of file vgavideo.h.

MISC

#define MISC   0x3c2

Definition at line 26 of file vgavideo.h.

mod2

#define mod2

(

n

)

((n)&1)

Definition at line 71 of file vgavideo.h.

mod8

#define mod8

(

n

)

((n)&7)

Definition at line 70 of file vgavideo.h.

SCREEN_STRIDE

#define SCREEN_STRIDE   80

Definition at line 5 of file vgavideo.h.

SCREEN_X

#define SCREEN_X   640

Definition at line 2 of file vgavideo.h.

SCREEN_Y

#define SCREEN_Y   480

Definition at line 3 of file vgavideo.h.

SEQ

#define SEQ   0x3c4

Definition at line 27 of file vgavideo.h.

SEQ_D

#define SEQ_D   0x3C5 /* Sequencer Data Register */

Definition at line 57 of file vgavideo.h.

SEQ_I

#define SEQ_I   0x3C4 /* Sequencer Index */

Definition at line 56 of file vgavideo.h.

STATUS

#define STATUS   0x3da

Definition at line 32 of file vgavideo.h.

VGA_AND

#define VGA_AND   8

Definition at line 8 of file vgavideo.h.

VGA_NORMAL

#define VGA_NORMAL   0

Definition at line 7 of file vgavideo.h.

VGA_OR

#define VGA_OR   16

Definition at line 9 of file vgavideo.h.

VGA_XOR

#define VGA_XOR   24

Definition at line 10 of file vgavideo.h.

Typedef Documentation

VideoMode

typedef struct _VideoMode VideoMode

Function Documentation

abs()

INT __cdecl abs

(

INT

nm

)

DIB_BltFromVGA()

void DIB_BltFromVGA	(	int	x,
		int	y,
		int	w,
		int	h,
		void *	b,
		int	Dest_lDelta
	)

Definition at line 352 of file vgavideo.c.

{
    ULONG plane;
    ULONG left = x >> 3;
    ULONG shift = x - (x & ~0x7);
    UCHAR pixel, nextpixel;
    LONG rightcount;
    INT i, j;
    LONG stride = w >> 3;
 
    /* Calculate the number of rightmost bytes not in a dword block. */
    if (w >= 8)
    {
        rightcount = w % 8;
    }
    else
    {
        stride = 0;
        rightcount = w;
    }
    rightcount = (rightcount + 1) / 2;
 
    /* Reset the destination. */
    for (j = 0; j < h; j++)
        memset((PVOID)((ULONG_PTR)b + (j * Dest_lDelta)), 0, abs(Dest_lDelta));
 
    for (plane = 0; plane < 4; plane++)
    {
        PUCHAR dest = b;
 
        /* Select the plane we are reading in this iteration. */
        WRITE_PORT_UCHAR((PUCHAR)GRA_I, 0x04);
        WRITE_PORT_UCHAR((PUCHAR)GRA_D, plane);
 
        for (j = 0; j < h; j++)
        {
            PULONG destline = (PULONG)dest;
            PUCHAR src = vidmem + (y + j) * SCREEN_STRIDE + left;
            /* Read the data for one plane for an eight aligned pixel block. */
            nextpixel = PreCalcReverseByte[READ_REGISTER_UCHAR(src)];
            for (i = 0; i < stride; i++, src++, destline++)
            {
                /* Form the data for one plane for an aligned block in the destination. */
                pixel = nextpixel;
                pixel >>= shift;
 
                nextpixel = PreCalcReverseByte[READ_REGISTER_UCHAR(src + 1)];
                pixel |= (nextpixel << (8 - shift));
 
                /* Expand the plane data to 'chunky' format and store. */
                *destline |= (UnpackPixel[pixel] << plane);
            }
            /* Handle any pixels not falling into a full block. */
            if (rightcount != 0)
            {
                ULONG row;
 
                /* Form the data for a complete block. */
                pixel = nextpixel;
                pixel >>= shift;
 
                nextpixel = PreCalcReverseByte[READ_REGISTER_UCHAR(src + 1)];
                pixel |= (nextpixel << (8 - shift));
 
                row = UnpackPixel[pixel] << plane;
 
                /* Store the data for each byte in the destination. */
                for (i = 0; i < rightcount; i++)
                {
                    ((PUCHAR)destline)[i] |= (row & 0xFF);
                    row >>= 8;
                }
            }
            dest += Dest_lDelta;
        }
    }
 
#ifdef VGA_VERIFY
    for (j = 0; j < h; j++)
    {
        for (i = 0; i < w; i += 2)
        {
            UCHAR c1, c2;
            ULONG mask = (i < (w - 1)) ? 0xFF : 0xF0;
 
            c1 = (vgaGetPixel(x + i, y + j) << 4) | (vgaGetPixel(x + i + 1, y + j));
            c2 = ((PUCHAR)b)[(j * Dest_lDelta) + (i >> 1)];
            if ((c1 & mask) != (c2 & mask))
                EngDebugBreak();
        }
    }
#endif /* VGA_VERIFY */
}

Referenced by DrvCopyBits(), and VGAtoDIB().

DIB_BltToVGA()

void DIB_BltToVGA	(	int	x,
		int	y,
		int	w,
		int	h,
		void *	b,
		int	Source_lDelta,
		int	StartMod
	)

Definition at line 447 of file vgavideo.c.

{
    PUCHAR pb, opb = b;
    LONG i, j;
    LONG x2 = x + w;
    LONG y2 = y + h;
    ULONG offset;
 
    for (i = x; i < x2; i++)
    {
        pb = opb;
        offset = xconv[i] + y80[y];
 
        WRITE_PORT_UCHAR((PUCHAR)GRA_I, 0x08);       // set the mask
        WRITE_PORT_UCHAR((PUCHAR)GRA_D, maskbit[i]);
 
        if (StartMod == ((i - x) % 2))
        {
            for (j = y; j < y2; j++)
            {
                READ_REGISTER_UCHAR(vidmem + offset);
                WRITE_REGISTER_UCHAR(vidmem + offset, (*pb & 0xf0) >> 4);
                offset += 80;
                pb += Source_lDelta;
            }
        }
        else
        {
            for (j = y; j < y2; j++)
            {
                READ_REGISTER_UCHAR(vidmem + offset);
                WRITE_REGISTER_UCHAR(vidmem + offset, *pb & 0x0f);
                offset += 80;
                pb += Source_lDelta;
            }
        }
 
        if (StartMod != ((i - x) % 2))
            opb++;
    }
}

Referenced by DIBtoVGA(), and DrvCopyBits().

DIB_BltToVGAWithXlate()

void DIB_BltToVGAWithXlate	(	int	x,
		int	y,
		int	w,
		int	h,
		void *	b,
		int	Source_lDelta,
		XLATEOBJ *	Xlate
	)

Definition at line 491 of file vgavideo.c.

{
    PUCHAR pb, opb = b;
    ULONG i, j;
    ULONG x2 = x + w;
    ULONG y2 = y + h;
    ULONG offset;
 
    for (i = x; i < x2; i++)
    {
        pb = opb;
        offset = xconv[i] + y80[y];
 
        WRITE_PORT_UCHAR((PUCHAR)GRA_I, 0x08);       // set the mask
        WRITE_PORT_UCHAR((PUCHAR)GRA_D, maskbit[i]);
 
        if (0 == ((i - x) % 2))
        {
            for (j = y; j < y2; j++)
            {
                READ_REGISTER_UCHAR(vidmem + offset);
                WRITE_REGISTER_UCHAR(vidmem + offset, XLATEOBJ_iXlate(Xlate, (*pb & 0xf0) >> 4));
                offset += 80;
                pb += Source_lDelta;
            }
        }
        else
        {
            for (j = y; j < y2; j++)
            {
                READ_REGISTER_UCHAR(vidmem + offset);
                WRITE_REGISTER_UCHAR(vidmem + offset, XLATEOBJ_iXlate(Xlate, *pb & 0x0f));
                offset += 80;
                pb += Source_lDelta;
            }
        }
 
        if (0 != ((i - x) % 2))
            opb++;
    }
}

Referenced by DIBtoVGA().

DIB_TransparentBltToVGA()

void DIB_TransparentBltToVGA	(	int	x,
		int	y,
		int	w,
		int	h,
		void *	b,
		int	Source_lDelta,
		ULONG	trans
	)

Definition at line 536 of file vgavideo.c.

{
    PUCHAR pb = b, opb = b;
    BOOLEAN edgePixel = FALSE;
    ULONG i, j;
    ULONG x2 = x + w;
    ULONG y2 = y + h;
    UCHAR b1, b2;
 
    /* Check if the width is odd */
    if(mod2(w) > 0)
    {
        edgePixel = TRUE;
        x2 -= 1;
    }
 
    for (j=y; j<y2; j++)
    {
        for (i=x; i<x2; i+=2)
        {
            b1 = (*pb & 0xf0) >> 4;
            b2 = *pb & 0x0f;
            if(b1 != trans) vgaPutPixel(i,   j, b1);
            if(b2 != trans) vgaPutPixel(i+1, j, b2);
            pb++;
        }
 
        if (edgePixel)
        {
            b1 = *pb;
            if(b1 != trans) vgaPutPixel(x2, j, b1);
            pb++;
        }
 
        opb += Source_lDelta;
        pb = opb; // new test code
    }
}

Referenced by DrvTransparentBlt().

get_masks()

void get_masks	(	int	x,
		int	w
	)

Definition at line 133 of file vgavideo.c.

{
    register int tmp;
 
    leftMask = rightMask = 0;
    byteCounter = w;
    /* right margin */
    tmp = (x+w) & 7;
    if (tmp)
    {
        byteCounter -= tmp;
        rightMask = (unsigned char)(0xff00 >> tmp);
    }
    /* left margin */
    tmp = x & 7;
    if (tmp)
    {
        byteCounter -= (8 - tmp);
        leftMask = (0xff >> tmp);
    }
    /* too small ? */
    if (byteCounter < 0)
    {
        leftMask &= rightMask;
        rightMask = 0;
        byteCounter = 0;
    }
    byteCounter /= 8;
}

Referenced by DFB_BltFromVGA(), and vgaReadScan().

VGADDIIntersectRect()

BOOL VGADDIIntersectRect	(	PRECTL	prcDst,
		PRECTL	prcSrc1,
		PRECTL	prcSrc2
	)

Definition at line 333 of file vgavideo.c.

{
    prcDst->left  = max(prcSrc1->left, prcSrc2->left);
    prcDst->right = min(prcSrc1->right, prcSrc2->right);
 
    if (prcDst->left < prcDst->right)
    {
        prcDst->top = max(prcSrc1->top, prcSrc2->top);
        prcDst->bottom = min(prcSrc1->bottom, prcSrc2->bottom);
 
       if (prcDst->top < prcDst->bottom)
           return TRUE;
    }
 
    *prcDst = rclEmpty;
 
    return FALSE;
}

vgaGetByte()

VOID vgaGetByte	(	ULONG	offset,
		UCHAR *	b,
		UCHAR *	g,
		UCHAR *	r,
		UCHAR *	i
	)

vgaGetPixel()

INT vgaGetPixel	(	INT	x,
		INT	y
	)

vgaHLine()

BOOL vgaHLine	(	INT	x,
		INT	y,
		INT	len,
		UCHAR	c
	)

Definition at line 231 of file vgavideo.c.

{
    ULONG orgx, pre1, midpre1;
    //ULONG orgpre1;
    LONG ileftpix, imidpix, irightpix;
 
    orgx = x;
 
    /*if ( len < 8 )
    {
        for (i = x; i < x+len; i++ )
            vgaPutPixel ( i, y, c );
 
        return TRUE;
    }*/
 
    /* Calculate the left mask pixels, middle bytes and right mask pixel */
    ileftpix = 7 - mod8(x-1);
    irightpix = mod8(x+len);
    imidpix = (len-ileftpix-irightpix) / 8;
 
    pre1 = xconv[(x-1)&~7] + y80[y];
    //orgpre1=pre1;
 
    /* check for overlap ( very short line ) */
    if ( (ileftpix+irightpix) > len )
    {
        int mask = startmasks[ileftpix] & endmasks[irightpix];
        /* Write left pixels */
        WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);     // set the mask
        WRITE_PORT_UCHAR((PUCHAR)GRA_D,mask);
 
        READ_REGISTER_UCHAR(vidmem + pre1);
        WRITE_REGISTER_UCHAR(vidmem + pre1, c);
 
        return TRUE;
    }
 
    /* Left */
    if ( ileftpix > 0 )
    {
        /* Write left pixels */
        WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);     // set the mask
        WRITE_PORT_UCHAR((PUCHAR)GRA_D,startmasks[ileftpix]);
 
        READ_REGISTER_UCHAR(vidmem + pre1);
        WRITE_REGISTER_UCHAR(vidmem + pre1, c);
 
        /* Prepare new x for the middle */
        x = orgx + 8;
    }
 
    if ( imidpix > 0 )
    {
        midpre1 = xconv[x] + y80[y];
 
        /* Set mask to all pixels in byte */
        WRITE_PORT_UCHAR((PUCHAR)GRA_I, 0x08);
        WRITE_PORT_UCHAR((PUCHAR)GRA_D, 0xff);
        memset(vidmem+midpre1, c, imidpix); // write middle pixels, no need to read in latch because of the width
    }
 
    if ( irightpix > 0 )
    {
        x = orgx + len - irightpix;
        pre1 = xconv[x] + y80[y];
 
        /* Write right pixels */
        WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);     // set the mask bits
        WRITE_PORT_UCHAR((PUCHAR)GRA_D, endmasks[irightpix]);
        READ_REGISTER_UCHAR(vidmem + pre1);
        WRITE_REGISTER_UCHAR(vidmem + pre1, c);
    }
 
    return TRUE;
}

Referenced by DrvLineTo().

vgaPreCalc()

VOID vgaPreCalc

(

VOID

)

vgaPutByte()

VOID vgaPutByte	(	INT	x,
		INT	y,
		UCHAR	c
	)

Definition at line 176 of file vgavideo.c.

{
    ULONG offset;
 
    offset = xconv[x]+y80[y];
 
    /* Set the write mode */
    WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);
    WRITE_PORT_UCHAR((PUCHAR)GRA_D,0xff);
 
    WRITE_REGISTER_UCHAR(vidmem + offset, c);
}

vgaPutPixel()

VOID vgaPutPixel	(	INT	x,
		INT	y,
		UCHAR	c
	)

Definition at line 163 of file vgavideo.c.

{
    ULONG offset;
 
    offset = xconv[x]+y80[y];
 
    WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);
    WRITE_PORT_UCHAR((PUCHAR)GRA_D,maskbit[x]);
 
    READ_REGISTER_UCHAR(vidmem + offset);
    WRITE_REGISTER_UCHAR(vidmem + offset, c);
}

Referenced by DIB_TransparentBltToVGA(), VGADDI_BltMask(), vgaNEtoSW(), vgaNWtoSE(), vgaSEtoNW(), and vgaSWtoNE().

vgaVLine()

BOOL vgaVLine	(	INT	x,
		INT	y,
		INT	len,
		UCHAR	c
	)

Definition at line 308 of file vgavideo.c.

{
    INT offset, i;
 
    offset = xconv[x]+y80[y];
 
#ifdef VGA_PERF
    vgaSetBitMaskRegister ( maskbit[x] );
#else
    WRITE_PORT_UCHAR((PUCHAR)GRA_I,0x08);       // set the mask
    WRITE_PORT_UCHAR((PUCHAR)GRA_D,maskbit[x]);
#endif
 
    for(i=y; i<y+len; i++)
    {
        READ_REGISTER_UCHAR(vidmem + offset);
        WRITE_REGISTER_UCHAR(vidmem + offset, c);
        offset += 80;
    }
 
    return TRUE;
}

Referenced by DrvLineTo().

Variable Documentation

bit8

int bit8[640]

extern

Definition at line 15 of file vgavideo.c.

Referenced by vgaGetPixel(), and vgaPreCalc().

endmasks

int endmasks[8]

extern

Definition at line 17 of file vgavideo.c.

Referenced by VGADDIFillSolid(), vgaHLine(), and vgaPreCalc().

maskbit

int maskbit[640]

extern

Definition at line 12 of file vgavideo.c.

Referenced by DIB_BltToVGA(), DIB_BltToVGAWithXlate(), VGADDI_BltMask(), vgaGetPixel(), vgaPreCalc(), vgaPutPixel(), and vgaVLine().

PreCalcReverseByte

UCHAR PreCalcReverseByte[256]

extern

Definition at line 11 of file vgavideo.c.

Referenced by DIB_BltFromVGA(), and vgaPreCalc().

startmasks

int startmasks[8]

extern

Definition at line 16 of file vgavideo.c.

Referenced by VGADDIFillSolid(), vgaHLine(), and vgaPreCalc().

vidmem

PBYTE vidmem

extern

Definition at line 18 of file vgavideo.c.

Referenced by DIB_BltFromVGA(), DIB_BltToVGA(), DIB_BltToVGAWithXlate(), fill_videocontroller(), InitVGA(), ScrIoControl(), ScrWrite(), VGADDI_BltBrush(), VGADDI_BltFromSavedScreenBits(), VGADDI_BltPointerToVGA(), VGADDI_BltToSavedScreenBits(), VGADDIFillSolid(), vgaGetByte(), vgaHLine(), vgaPutByte(), vgaPutPixel(), and vgaVLine().

xconv

int xconv[640]

extern

Definition at line 14 of file vgavideo.c.

Referenced by DIB_BltToVGA(), DIB_BltToVGAWithXlate(), VGADDIFillSolid(), vgaGetPixel(), vgaHLine(), vgaPreCalc(), vgaPutByte(), vgaPutPixel(), and vgaVLine().

y80

int y80[480]

extern

Definition at line 13 of file vgavideo.c.

Referenced by DIB_BltToVGA(), DIB_BltToVGAWithXlate(), VGADDIFillSolid(), vgaGetPixel(), vgaHLine(), vgaPreCalc(), vgaPutByte(), vgaPutPixel(), and vgaVLine().