/*
 * bltWinDraw.c --
 *
 *	This module contains WIN32 routines not included in the Tcl/Tk
 *	libraries.
 *
 * Copyright 1998 by Bell Labs Innovations for Lucent Technologies.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that the above copyright notice appear in all
 * copies and that both that the copyright notice and warranty
 * disclaimer appear in supporting documentation, and that the names
 * of Lucent Technologies any of their entities not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.
 *
 * Lucent Technologies disclaims all warranties with regard to this
 * software, including all implied warranties of merchantability and
 * fitness.  In no event shall Lucent Technologies be liable for any
 * special, indirect or consequential damages or any damages
 * whatsoever resulting from loss of use, data or profits, whether in
 * an action of contract, negligence or other tortuous action, arising
 * out of or in connection with the use or performance of this
 * software.
 */

#include <bltInt.h>
#include <X11/Xutil.h>
#include <X11/Xlib.h>

#define WINDEBUG 0

/*
 * Data structure for setting graphics context.
 */
typedef struct {
    int function;		/* logical operation */
    unsigned long plane_mask;	/* plane mask */
    unsigned long foreground;	/* foreground pixel */
    unsigned long background;	/* background pixel */
    int line_width;		/* line width */
    int line_style;		/* LineSolid, LineOnOffDash, LineDoubleDash */
    int cap_style;		/* CapNotLast, CapButt,
				   CapRound, CapProjecting */
    int join_style;		/* JoinMiter, JoinRound, JoinBevel */
    int fill_style;		/* FillSolid, FillTiled,
				   FillStippled, FillOpaeueStippled */
    int fill_rule;		/* EvenOddRule, WindingRule */
    int arc_mode;		/* ArcChord, ArcPieSlice */
    Pixmap tile;		/* tile pixmap for tiling operations */
    Pixmap stipple;		/* stipple 1 plane pixmap for stipping */
    int ts_x_origin;		/* offset for tile or stipple operations */
    int ts_y_origin;
    Font font;			/* default text font for text operations */
    int subwindow_mode;		/* ClipByChildren, IncludeInferiors */
    Bool graphics_exposures;	/* boolean, should exposures be generated */
    int clip_x_origin;		/* origin for clipping */
    int clip_y_origin;
    Pixmap clip_mask;		/* bitmap clipping; other calls for rects */
    int dash_offset;		/* patterned/dashed line information */
    char dashes;		/* If -1, indicates that the extended
				 * information below is available. */
    int nDashValues;
    char dashValues[12];
} XGCValuesEx;

static int tkpWinRopModes[] =
{
    R2_BLACK,			/* GXclear */
    R2_MASKPEN,			/* GXand */
    R2_MASKPENNOT,		/* GXandReverse */
    R2_COPYPEN,			/* GXcopy */
    R2_MASKNOTPEN,		/* GXandInverted */
    R2_NOT,			/* GXnoop */
    R2_XORPEN,			/* GXxor */
    R2_MERGEPEN,		/* GXor */
    R2_NOTMERGEPEN,		/* GXnor */
    R2_NOTXORPEN,		/* GXequiv */
    R2_NOT,			/* GXinvert */
    R2_MERGEPENNOT,		/* GXorReverse */
    R2_NOTCOPYPEN,		/* GXcopyInverted */
    R2_MERGENOTPEN,		/* GXorInverted */
    R2_NOTMASKPEN,		/* GXnand */
    R2_WHITE			/* GXset */
};

#define MASKPAT		0x00E20746 /* dest = (src & pat) | (!src & dst) */
#define COPYFG		0x00CA0749 /* dest = (pat & src) | (!pat & dst) */
#define COPYBG		0x00AC0744 /* dest = (!pat & src) | (pat & dst) */
/*
 * Translation table between X gc functions and Win32 BitBlt op modes.  Some
 * of the operations defined in X don't have names, so we have to construct
 * new opcodes for those functions.  This is arcane and probably not all that
 * useful, but at least it's accurate.
 */

#define NOTSRCAND	(DWORD)0x00220326 /* dest = (NOT src) AND dest */
#define NOTSRCINVERT	(DWORD)0x00990066 /* dest = (NOT src) XOR dest */
#define SRCORREVERSE	(DWORD)0x00DD0228 /* dest = src OR (NOT dest) */
#define SRCNAND		(DWORD)0x007700E6 /* dest = NOT (src AND dest) */

static int bltModes[] =
{
    BLACKNESS,			/* GXclear */
    SRCAND,			/* GXand */
    SRCERASE,			/* GXandReverse */
    SRCCOPY,			/* GXcopy */
    NOTSRCAND,			/* GXandInverted */
    PATCOPY,			/* GXnoop */
    SRCINVERT,			/* GXxor */
    SRCPAINT,			/* GXor */
    NOTSRCERASE,		/* GXnor */
    NOTSRCINVERT,		/* GXequiv */
    DSTINVERT,			/* GXinvert */
    SRCORREVERSE,		/* GXorReverse */
    NOTSRCCOPY,			/* GXcopyInverted */
    MERGEPAINT,			/* GXorInverted */
    SRCNAND,			/* GXnand */
    WHITENESS			/* GXset */
};

#if (TCL_VERSION_NUMBER <  _VERSION(8,1,0)) 
typedef void *Tcl_Encoding;	/* Make up dummy type for encoding.  */
#else 
static Tcl_Encoding systemEncoding = NULL;
#endif

HPALETTE
Blt_GetSystemPalette(void)
{
    HDC hDC;
    HPALETTE hPalette;
    DWORD flags;

    hPalette = NULL;
    hDC = GetDC(NULL);		/* Get the desktop device context */
    flags = GetDeviceCaps(hDC, RASTERCAPS);
    if (flags & RC_PALETTE) {
	LOGPALETTE *palettePtr;

	palettePtr = (LOGPALETTE *)
	    GlobalAlloc(GPTR, sizeof(LOGPALETTE) + 256 * sizeof(PALETTEENTRY));
	palettePtr->palVersion = 0x300;
	palettePtr->palNumEntries = 256;
	GetSystemPaletteEntries(hDC, 0, 256, palettePtr->palPalEntry);
	hPalette = CreatePalette(palettePtr);
	GlobalFree(palettePtr);
    }
    ReleaseDC(NULL, hDC);
    return hPalette;
}

/*
 *----------------------------------------------------------------------
 *
 * CreateRotatedFont --
 *
 *	Creates a rotated copy of the given font.  This only works 
 *	for TrueType fonts.
 *
 * Results:
 *	Returns the newly create font or NULL if the font could not
 *	be created.
 *
 *----------------------------------------------------------------------
 */
HFONT
CreateRotatedFont(
    unsigned long fontId,	/* Font identifier (actually a Tk_Font) */
    double theta)
{				/* Number of degrees to rotate font */
    TkFontAttributes *faPtr;	/* Set of attributes to match. */
    TkFont *fontPtr;
    HFONT hFont;
    LOGFONTW lf;

    fontPtr = (TkFont *) fontId;
    faPtr = &fontPtr->fa;
    ZeroMemory(&lf, sizeof(LOGFONT));
    lf.lfHeight = -faPtr->pointsize;
    if (lf.lfHeight < 0) {
	HDC dc;

	dc = GetDC(NULL);
	lf.lfHeight = -MulDiv(faPtr->pointsize,
	    GetDeviceCaps(dc, LOGPIXELSY), 72);
	ReleaseDC(NULL, dc);
    }
    lf.lfWidth = 0;
    lf.lfEscapement = lf.lfOrientation = ROUND(theta * 10.0);
#define TK_FW_NORMAL	0
    lf.lfWeight = (faPtr->weight == TK_FW_NORMAL) ? FW_NORMAL : FW_BOLD;
    lf.lfItalic = faPtr->slant;
    lf.lfUnderline = faPtr->underline;
    lf.lfStrikeOut = faPtr->overstrike;
    lf.lfCharSet = DEFAULT_CHARSET;
    lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;
    lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
    lf.lfQuality = DEFAULT_QUALITY;
    lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;

    hFont = NULL;
    if (faPtr->family == NULL) {
	lf.lfFaceName[0] = '\0';
    } else {
#if (TCL_VERSION_NUMBER >= _VERSION(8,1,0)) 
	Tcl_DString dString;

	Tcl_UtfToExternalDString(systemEncoding, faPtr->family, -1, &dString);

	if (Blt_GetPlatformId() == VER_PLATFORM_WIN32_NT) {
	    Tcl_UniChar *src, *dst;
	    
	    /*
	     * We can only store up to LF_FACESIZE wide characters
	     */
	    if (Tcl_DStringLength(&dString) >= (LF_FACESIZE * sizeof(WCHAR))) {
		Tcl_DStringSetLength(&dString, LF_FACESIZE);
	    }
	    src = (Tcl_UniChar *)Tcl_DStringValue(&dString);
	    dst = (Tcl_UniChar *)lf.lfFaceName;
	    while (*src != '\0') {
		*dst++ = *src++;
	    }
	    *dst = '\0';
	    hFont = CreateFontIndirectW((LOGFONTW *)&lf);
	} else {
	    /*
	     * We can only store up to LF_FACESIZE characters
	     */
	    if (Tcl_DStringLength(&dString) >= LF_FACESIZE) {
		Tcl_DStringSetLength(&dString, LF_FACESIZE);
	    }
	    strcpy((char *)lf.lfFaceName, Tcl_DStringValue(&dString));
	    hFont = CreateFontIndirectA((LOGFONTA *)&lf);
	}
	Tcl_DStringFree(&dString);
#else
	strncpy((char *)lf.lfFaceName, faPtr->family, LF_FACESIZE - 1);
	lf.lfFaceName[LF_FACESIZE] = '\0';
#endif /* TCL_VERSION_NUMBER >= 8.1.0 */
    }

    if (hFont == NULL) {
#if WINDEBUG
	PurifyPrintf("can't create font: %s\n", Blt_LastError());
#endif
    } else { 
	HFONT oldFont;
	TEXTMETRIC tm;
	HDC hRefDC;
	int result;

	/* Check if the rotated font is really a TrueType font. */

	hRefDC = GetDC(NULL);		/* Get the desktop device context */
	oldFont = SelectFont(hRefDC, hFont);
	result = ((GetTextMetrics(hRefDC, &tm)) && 
		  (tm.tmPitchAndFamily & TMPF_TRUETYPE));
	SelectFont(hRefDC, oldFont);
	ReleaseDC(NULL, hRefDC);
	if (!result) {
#if WINDEBUG
	    PurifyPrintf("not a true type font\n");
#endif
	    DeleteFont(hFont);
	    return NULL;
	}
    }
    return hFont;
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_GetBitmapData --
 *
 *	Returns the DIB bits from a bitmap.
 *
 * Results:
 *	Returns a byte array of bitmap data or NULL if an error
 *	occurred.  The parameter pitchPtr returns the number
 *	of bytes per row.
 *
 *----------------------------------------------------------------------
 */
unsigned char *
Blt_GetBitmapData(
    Display *display,		/* Display of bitmap */
    Pixmap bitmap,		/* Bitmap to query */
    int width,			/* Width of bitmap */
    int height,			/* Height of bitmap */
    int *pitchPtr)		/* (out) Number of bytes per row */
{			
    TkWinDCState state;
    HDC dc;
    int result;
    unsigned char *bits;
    unsigned int size;
    HBITMAP hBitmap;
    BITMAPINFOHEADER *bmiPtr;
    HANDLE hMem, hMem2;
    int bytesPerRow, imageSize;

    size = sizeof(BITMAPINFOHEADER) + 2 * sizeof(RGBQUAD);
    hMem = GlobalAlloc(GHND, size);
    bmiPtr = (BITMAPINFOHEADER *)GlobalLock(hMem);
    bmiPtr->biSize = sizeof(BITMAPINFOHEADER);
    bmiPtr->biPlanes = 1;
    bmiPtr->biBitCount = 1;
    bmiPtr->biCompression = BI_RGB;
    bmiPtr->biWidth = width;
    bmiPtr->biHeight = height;

    hBitmap = ((TkWinDrawable *)bitmap)->bitmap.handle;
    dc = TkWinGetDrawableDC(display, bitmap, &state);
    result = GetDIBits(dc, hBitmap, 0, height, (LPVOID)NULL, 
	(BITMAPINFO *)bmiPtr, DIB_RGB_COLORS);
    TkWinReleaseDrawableDC(bitmap, dc, &state);
    if (!result) {
	GlobalUnlock(hMem);
	GlobalFree(hMem);
	return NULL;
    }
    imageSize = bmiPtr->biSizeImage;
    GlobalUnlock(hMem);
    bytesPerRow = ((width + 31) & ~31) / 8;
    if (imageSize == 0) {
         imageSize = bytesPerRow * height;
    }	
    hMem2 = GlobalReAlloc(hMem, size + imageSize, 0);
    if (hMem2 == NULL) {
	GlobalFree(hMem);
        return NULL;
    }
    hMem = hMem2;
    bmiPtr = (LPBITMAPINFOHEADER)GlobalLock(hMem);
    dc = TkWinGetDrawableDC(display, bitmap, &state);
    result = GetDIBits(dc, hBitmap, 0, height, (unsigned char *)bmiPtr + size, 
        (BITMAPINFO *)bmiPtr, DIB_RGB_COLORS);
    TkWinReleaseDrawableDC(bitmap, dc, &state);
    bits = NULL;
    if (!result) {
	OutputDebugString("GetDIBits failed\n");
    } else {
	bits = Blt_Malloc(imageSize);
	if (bits != NULL) {
	    memcpy (bits, (unsigned char *)bmiPtr + size, imageSize);
	}
    }
    *pitchPtr = bytesPerRow;
    GlobalUnlock(hMem);
    GlobalFree(hMem);
    return bits;
}

/*
 *----------------------------------------------------------------------
 *
 * XFree --
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXFree(void *ptr)
{
    Blt_Free(ptr);
}

/*
 *----------------------------------------------------------------------
 *
 * XMaxRequestSize --
 *
 *----------------------------------------------------------------------
 */
long
Blt_EmulateXMaxRequestSize(Display *display)
{
    return (SHRT_MAX / 4);
}

/*
 *----------------------------------------------------------------------
 *
 * XLowerWindow --
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXLowerWindow(
    Display *display, 
    Window window)
{
    HWND hWnd;

    hWnd = Tk_GetHWND(window);
    display->request++;
    SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}

/*
 *----------------------------------------------------------------------
 *
 * XRaiseWindow --
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXRaiseWindow(
    Display *display, 
    Window window)
{
    HWND hWnd;

    hWnd = Tk_GetHWND(window);
    display->request++;
    SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}

/*
 *----------------------------------------------------------------------
 *
 * XUnmapWindow --
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXUnmapWindow(
    Display *display, 
    Window window)
{
    HWND hWnd;

    hWnd = Tk_GetHWND(window);
    display->request++;
    ShowWindow(hWnd, SW_HIDE);
    /* SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE); */
}

/*
 *----------------------------------------------------------------------
 *
 * XWarpPointer --
 *
 *	If destWindow is None, moves the pointer by the offsets (destX,
 *	destY) relative to the current position of the pointer.
 *	If destWindow is a window, moves the pointer to the offsets
 *	(destX, destY) relative to the origin of destWindow.  However,
 *	if srcWindow is a window, the move only takes place if the window
 *	srcWindow contains the pointer and if the specified rectangle of
 *	srcWindow contains the pointer.
 *
 *	The srcX and srcY coordinates are relative to the origin of
 *	srcWindow.  If srcHeight is zero, it is replaced with the current
 *	height of srcWindow minus srcY.  If srcWidth is zero, it is
 *	replaced with the current width of srcWindow minus srcX.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXWarpPointer(
    Display *display,
    Window srcWindow,
    Window destWindow,
    int srcX,
    int srcY,
    unsigned int srcWidth,
    unsigned int srcHeight,
    int destX,
    int destY)
{
    HWND hWnd;
    POINT point;

    hWnd = Tk_GetHWND(destWindow);
    point.x = destX, point.y = destY;
    if (ClientToScreen(hWnd, &point)) {
	SetCursorPos(point.x, point.y);
    }
}

#ifdef notdef
static Blt_HashTable gcTable;
static int gcInitialized = FALSE;
#endif

typedef struct {
    HDC dc;
    int count;
    COLORREF color;
    int offset, nBits;
} DashInfo;

void
Blt_SetDashes(Display *display, GC gc, Blt_Dashes *dashesPtr)
{
    XGCValuesEx *gcPtr = (XGCValuesEx *)gc;

    /* This must be used only with a privately created GC */
    assert((int)gcPtr->dashes == -1);
    gcPtr->nDashValues = strlen(dashesPtr->values);
    gcPtr->dash_offset = dashesPtr->offset;
    strcpy(gcPtr->dashValues, dashesPtr->values);
}

static int
GetDashInfo(
    HDC dc, 
    GC gc, 
    DashInfo *infoPtr)
{
    int dashOffset, dashValue;

    dashValue = 0;
    dashOffset = gc->dash_offset;
    if ((int)gc->dashes == -1) {
	XGCValuesEx *gcPtr = (XGCValuesEx *)gc;

	if (gcPtr->nDashValues == 1) {
	    dashValue = gcPtr->dashValues[0];
	}
    } else if (gc->dashes > 0) {
	dashValue = (int)gc->dashes;
    }
    if (dashValue == 0) {
	return FALSE;
    }
    infoPtr->dc = dc;
    infoPtr->nBits = dashValue;
    infoPtr->offset = dashOffset;
    infoPtr->count = 0;
    infoPtr->color = gc->foreground;
    return TRUE;
}

void
Blt_SetROP2(HDC dc, int function)
{
    SetROP2(dc, tkpWinRopModes[function]);
}

static XGCValuesEx *
CreateGC()
{
    XGCValuesEx *gcPtr;

    gcPtr = Blt_Malloc(sizeof(XGCValuesEx));
    if (gcPtr == NULL) {
	return NULL;
    }
    gcPtr->arc_mode = ArcPieSlice;
    gcPtr->background = 0xffffff;
    gcPtr->cap_style = CapNotLast;
    gcPtr->clip_mask = None;
    gcPtr->clip_x_origin = gcPtr->clip_y_origin = 0;
    gcPtr->dash_offset	= 0;
    gcPtr->fill_rule = WindingRule;
    gcPtr->fill_style = FillSolid;
    gcPtr->font = None;
    gcPtr->foreground = 0;
    gcPtr->function = GXcopy;
    gcPtr->graphics_exposures = True;
    gcPtr->join_style = JoinMiter;
    gcPtr->line_style = LineSolid;
    gcPtr->line_width = 0;
    gcPtr->plane_mask = ~0;
    gcPtr->stipple = None;
    gcPtr->subwindow_mode = ClipByChildren;
    gcPtr->tile = None;
    gcPtr->ts_x_origin = gcPtr->ts_y_origin = 0;

    gcPtr->dashes = -1;    /* Mark that this an extended GC */
    gcPtr->nDashValues	= 0;

    return gcPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmulateXCreateGC --
 *
 *	Allocate a new extended GC, and initialize the specified fields.
 *
 * Results:
 *	Returns a newly allocated GC.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */
GC
Blt_EmulateXCreateGC(
    Display *display,
    Drawable drawable,
    unsigned long mask,
    XGCValues *srcPtr)
{
    XGCValuesEx *destPtr;

    destPtr = CreateGC();
    if (destPtr == NULL) {
	return None;
    }
    if (mask & GCFunction) {
        destPtr->function = srcPtr->function;
    }
    if (mask & GCPlaneMask) {
	destPtr->plane_mask = srcPtr->plane_mask;
    }
    if (mask & GCForeground) {
	destPtr->foreground = srcPtr->foreground;
    }
    if (mask & GCBackground) {
        destPtr->background = srcPtr->background;
    }
    if (mask & GCLineWidth) {
	destPtr->line_width = srcPtr->line_width;
    }
    if (mask & GCLineStyle) {
	destPtr->line_style = srcPtr->line_style;
    }
    if (mask & GCCapStyle) {
	destPtr->cap_style = srcPtr->cap_style;
    }
    if (mask & GCJoinStyle) {
	destPtr->join_style = srcPtr->join_style;
    }
    if (mask & GCFillStyle) {
	destPtr->fill_style = srcPtr->fill_style;
    }
    if (mask & GCFillRule) {
        destPtr->fill_rule = srcPtr->fill_rule;
    }
    if (mask & GCArcMode) {
        destPtr->arc_mode = srcPtr->arc_mode;
    }
    if (mask & GCTile) {
	destPtr->tile = srcPtr->tile;
    }
    if (mask & GCStipple) {
        destPtr->stipple = srcPtr->stipple;
    }
    if (mask & GCTileStipXOrigin) {
	destPtr->ts_x_origin = srcPtr->ts_x_origin;
    }
    if (mask & GCTileStipXOrigin) {
	destPtr->ts_y_origin = srcPtr->ts_y_origin;
    }
    if (mask & GCFont) {
        destPtr->font = srcPtr->font;
    }
    if (mask & GCSubwindowMode) {
	destPtr->subwindow_mode = srcPtr->subwindow_mode;
    }
    if (mask & GCGraphicsExposures) {
	destPtr->graphics_exposures = srcPtr->graphics_exposures;
    }
    if (mask & GCClipXOrigin) {
	destPtr->clip_x_origin = srcPtr->clip_x_origin;
    }
    if (mask & GCClipYOrigin) {
	destPtr->clip_y_origin = srcPtr->clip_y_origin;
    }
    if (mask & GCDashOffset) {
	destPtr->dash_offset = srcPtr->dash_offset;
    }
    if (mask & GCDashList) {
        destPtr->dashes = srcPtr->dashes;
    }
    if (mask & GCClipMask) {
	struct ClipMask {
	    int type;		/* TKP_CLIP_PIXMAP or TKP_CLIP_REGION */
	    Pixmap pixmap;
	} *clipPtr;

	clipPtr = Blt_Malloc(sizeof(struct ClipMask));
#define TKP_CLIP_PIXMAP 0
	clipPtr->type = TKP_CLIP_PIXMAP;
	clipPtr->pixmap = srcPtr->clip_mask;
	destPtr->clip_mask = (Pixmap) clipPtr;
    }
    return (GC)destPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_GCToPen --
 *
 *	Set up the graphics port from the given GC.
 *
 *	Geometric and cosmetic pens available under both 95 and NT.  
 *	Geometric pens differ from cosmetic pens in that they can 
 *	  1. Draw in world units (can have thick lines: line width > 1).
 *	  2. Under NT, allow arbitrary line style.
 *	  3. Can have caps and join (needed for thick lines).
 *	  4. Draw very, very slowly.
 *
 *	Cosmetic pens are single line width only.
 *
 * 			 95	 98	 NT
 *	  PS_SOLID	c,g	c,g	c,g
 *	  PS_DASH		c,g	c,g	c,g
 *	  PS_DOT		  c	  c	c,g
 *	  PS_DASHDOT	  c	  - 	c,g
 *	  PS_DASHDOTDOT	  c	  -	c,g
 *	  PS_USERSTYLE	  -       -	c,g
 *	  PS_ALTERNATE	  -	  - 	  c
 *
 *	Geometric only for 95/98
 *
 *	  PS_ENDCAP_ROUND
 *	  PS_ENDCAP_SQUARE
 *	  PS_ENDCAP_FLAT
 *	  PS_JOIN_BEVEL
 *	  PS_JOIN_ROUND
 *	  PS_JOIN_MITER
 * 
 * Results:
 *	None.
 *
 * Side effects:
 *	The current port is adjusted.
 *
 *----------------------------------------------------------------------
 */
HPEN
Blt_GCToPen(HDC dc, GC gc)
{
    DWORD lineAttrs, lineStyle;
    DWORD dashArr[12];
    DWORD *dashPtr;
    int nValues, lineWidth;
    LOGBRUSH lBrush;
    HPEN pen;

    nValues = 0;
    lineWidth = (gc->line_width < 1) ? 1 : gc->line_width;
    if ((gc->line_style == LineOnOffDash) ||
	(gc->line_style == LineDoubleDash)) {
	XGCValuesEx *gcPtr = (XGCValuesEx *)gc;

	if ((int)gc->dashes == -1) {
	    register int i;

	    nValues = strlen(gcPtr->dashValues);
	    for (i = 0; i < nValues; i++) {
		dashArr[i] = (DWORD)gcPtr->dashValues[i];
	    }
	    if (nValues == 1) {
		dashArr[1] = dashArr[0];
		nValues = 2;
	    }
	} else {
	    dashArr[1] = dashArr[0] = (DWORD) gc->dashes;
	    nValues = 2;
	    gc->dashes = -1;
	}
    }

    switch (nValues) {
    case 0:
	lineStyle = PS_SOLID;
	break;
    case 3:
	lineStyle = PS_DASHDOT;
	break;
    case 4:
	lineStyle = PS_DASHDOTDOT;
	break;
    case 2:
    default:
	/* PS_DASH style dash length is too long. */
	lineStyle = PS_DOT;
	break;
    }

    lBrush.lbStyle = BS_SOLID;
    lBrush.lbColor = gc->foreground;
    lBrush.lbHatch = 0;		/* Value is ignored when style is BS_SOLID. */

    lineAttrs = 0;
    switch (gc->cap_style) {
    case CapNotLast:
    case CapButt:
	lineAttrs |= PS_ENDCAP_FLAT;
	break;
    case CapRound:
	lineAttrs |= PS_ENDCAP_ROUND;
	break;
    default:
	lineAttrs |= PS_ENDCAP_SQUARE;
	break;
    }
    switch (gc->join_style) {
    case JoinMiter:
	lineAttrs |= PS_JOIN_MITER;
	break;
    case JoinBevel:
	lineAttrs |= PS_JOIN_BEVEL;
	break;
    case JoinRound:
    default:
	lineAttrs |= PS_JOIN_ROUND;
	break;
    }
    SetBkMode(dc, TRANSPARENT);

    if (Blt_GetPlatformId() == VER_PLATFORM_WIN32_NT) {
	/* Windows NT/2000/XP. */
	if (nValues > 0) {
	    lineStyle = PS_USERSTYLE;
	    dashPtr = dashArr;
	} else {
	    dashPtr = NULL;
	}
	if (lineWidth > 1) {
	    /* Limit the use of geometric pens to thick lines. */
	    pen = ExtCreatePen(PS_GEOMETRIC | lineAttrs | lineStyle, lineWidth,
		       &lBrush, nValues, dashPtr);
	} else {
	    /* Cosmetic pens are much faster. */
	    pen = ExtCreatePen(PS_COSMETIC | lineAttrs | lineStyle, 1, &lBrush,
		       nValues, dashPtr);
	}	    
    } else {
	/* Windows 95/98. */
	if ((lineStyle == PS_SOLID) && (lineWidth > 1)) {
	    /* Use geometric pens with solid, thick lines only. */
	    pen = ExtCreatePen(PS_GEOMETRIC | lineAttrs | lineStyle, lineWidth,
		       &lBrush, 0, NULL);
	} else {
	    /* Otherwise sacrifice thick lines for dashes. */
	    pen = ExtCreatePen(PS_COSMETIC | lineStyle, 1, &lBrush, 0, NULL);
	}
    } 
    assert(pen != NULL);
    return pen;
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawRectangles --
 *
 *       Draws the outlines of the specified rectangles as if a
 *       five-point PolyLine protocol request were specified for each
 *       rectangle:
 *
 *             [x,y] [x+width,y] [x+width,y+height] [x,y+height]
 *             [x,y]
 *
 *      For the specified rectangles, these functions do not draw a
 *      pixel more than once.  XDrawRectangles draws the rectangles in
 *      the order listed in the array.  If rectangles intersect, the
 *      intersecting pixels are drawn multiple times.  Draws a
 *      rectangle.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws rectangles on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawRectangles(
    Display *display,
    Drawable drawable,
    GC gc,
    XRectangle *rectArr,
    int nRects)
{
    HPEN pen, oldPen;
    TkWinDCState state;
    HBRUSH brush, oldBrush;
    HDC dc;
    register XRectangle *rectPtr;
    register int i;

    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    pen = Blt_GCToPen(dc, gc);
    brush = GetStockObject(NULL_BRUSH);
    oldPen = SelectPen(dc, pen);
    oldBrush = SelectBrush(dc, brush);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    rectPtr = rectArr;
    for (i = 0; i < nRects; i++, rectPtr++) {
	Rectangle(dc, (int)rectPtr->x, (int)rectPtr->y,
	    (int)(rectPtr->x + rectPtr->width + 1),
	    (int)(rectPtr->y + rectPtr->height + 1));
    }
    DeletePen(SelectPen(dc, oldPen));
    DeleteBrush(SelectBrush(dc, oldBrush));
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

#ifdef notdef
/*
 * Implements the "pixeling" of small arcs, because GDI-performance
 * for this is awful
 * was made especially for BLT, graph4 demo now runs 4x faster
 *
 */
/* O-outer , I-inner, B-both */
#define NEITHER_ 0
#define OUTLINE 1
#define FILL 2
#define BOTH (OUTLINE|FILL)
#define MINIARCS 5
static int arcus0[1] =
{
    BOTH
};
static int arcus1[4] =
{
    BOTH, BOTH,
    BOTH, BOTH
};

static int arcus2[9] =
{
    NEITHER, OUTLINE, NEITHER,
    OUTLINE, FILL, OUTLINE,
    NEITHER, OUTLINE, NEITHER
};

static int arcus3[16] =
{
    NEITHER, OUTLINE, OUTLINE, NEITHER,
    OUTLINE, FILL, FILL, OUTLINE,
    OUTLINE, FILL, FILL, OUTLINE,
    NEITHER, OUTLINE, OUTLINE, NEITHER
};

static int arcus4[25] =
{
    NEITHER, OUTLINE, OUTLINE, OUTLINE, NEITHER,
    OUTLINE, FILL, FILL, FILL, OUTLINE,
    OUTLINE, FILL, FILL, FILL, OUTLINE,
    OUTLINE, FILL, FILL, FILL, OUTLINE,
    NEITHER, OUTLINE, OUTLINE, OUTLINE, NEITHER
};

static int *arcis[MINIARCS] =
{
    arcus0, arcus1, arcus2, arcus3, arcus4
};

static void
DrawMiniArc(
    HDC dc,
    int width,
    int x,
    int y,
    int mask,
    COLORREF inner,
    COLORREF outer)
{
    int *arc;
    int i, j;

    if (width > MINIARCS) {
	return;
    }
    arc = arcis[width];
    for (i = 0; i <= width; i++) {
	for (j = 0; j <= width; j++) {
	    bit = (mask & *arc);
	    if (bit & OUTLINE) {
		SetPixelV(dc, x + i, y + j, outer);
	    } else if (bit & FILL) {
		SetPixelV(dc, x + i, y + j, inner);
	    }
	    arc++;
	}
    }
}

#endif

/*
 *----------------------------------------------------------------------
 *
 * DrawArc --
 *
 *	This procedure handles the rendering of drawn or filled
 *	arcs and chords.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Renders the requested arcs.
 *
 *----------------------------------------------------------------------
 */
static void
DrawArc(
    HDC dc,
    int arcMode,		/* Mode: either ArcChord or ArcPieSlice */
    XArc *arcPtr,
    HPEN pen,
    HBRUSH brush)
{
    int start, extent, clockwise;
    int xstart, ystart, xend, yend;
    double radian_start, radian_end, xr, yr;
    double dx, dy;

    if ((arcPtr->angle1 == 0) && (arcPtr->angle2 == 23040)) {
	/* Handle special case of circle or ellipse */
	Ellipse(dc, arcPtr->x, arcPtr->y, arcPtr->x + arcPtr->width + 1,
	    arcPtr->y + arcPtr->height + 1);
	return;
    }
    start = arcPtr->angle1, extent = arcPtr->angle2;
    clockwise = (extent < 0);	/* Non-zero if clockwise */

    /*
     * Compute the absolute starting and ending angles in normalized radians.
     * Swap the start and end if drawing clockwise.
     */
    start = start % (64 * 360);
    if (start < 0) {
	start += (64 * 360);
    }
    extent = (start + extent) % (64 * 360);
    if (extent < 0) {
	extent += (64 * 360);
    }
    if (clockwise) {
	int tmp = start;
	start = extent;
	extent = tmp;
    }
#define XAngleToRadians(a) ((double)(a) / 64 * M_PI / 180);
    radian_start = XAngleToRadians(start);
    radian_end = XAngleToRadians(extent);

    /*
     * Now compute points on the radial lines that define the starting and
     * ending angles.  Be sure to take into account that the y-coordinate
     * system is inverted.
     */
    dx = arcPtr->width * 0.5;
    dy = arcPtr->height * 0.5;

    xr = arcPtr->x + dx;
    yr = arcPtr->y + dy;
    xstart = (int)((xr + cos(radian_start) * dx) + 0.5);
    ystart = (int)((yr + sin(-radian_start) * dy) + 0.5);
    xend = (int)((xr + cos(radian_end) * dx) + 0.5);
    yend = (int)((yr + sin(-radian_end) * dy) + 0.5);

    /*
     * Now draw a filled or open figure.  Note that we have to
     * increase the size of the bounding box by one to account for the
     * difference in pixel definitions between X and Windows.
     */

    if (brush == 0) {
	/*
	 * Note that this call will leave a gap of one pixel at the
	 * end of the arc for thin arcs.  We can't use ArcTo because
	 * it's only supported under Windows NT.
	 */
	Arc(dc, arcPtr->x, arcPtr->y, arcPtr->x + arcPtr->width + 1,
	    arcPtr->y + arcPtr->height + 1, xstart, ystart, xend, yend);
	/* FIXME: */
    } else {
	if (arcMode == ArcChord) {
	    Chord(dc, arcPtr->x, arcPtr->y, arcPtr->x + arcPtr->width + 1,
		arcPtr->y + arcPtr->height + 1, xstart, ystart, xend, yend);
	} else if (arcMode == ArcPieSlice) {
	    Pie(dc, arcPtr->x, arcPtr->y, arcPtr->x + arcPtr->width + 1,
		arcPtr->y + arcPtr->height + 1, xstart, ystart, xend, yend);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawArcs --
 *
 *	Draws multiple circular or elliptical arcs.  Each arc is
 *	specified by a rectangle and two angles.  The center of the
 *	circle or ellipse is the center of the rect- angle, and the
 *	major and minor axes are specified by the width and height.
 *	Positive angles indicate counterclock- wise motion, and
 *	negative angles indicate clockwise motion.  If the magnitude
 *	of angle2 is greater than 360 degrees, XDrawArcs truncates it
 *	to 360 degrees.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws an arc for each array element on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawArcs(
    Display *display,
    Drawable drawable,
    GC gc,
    XArc *arcArr,
    int nArcs)
{
    HPEN pen, oldPen;
    HBRUSH brush, oldBrush;
    HDC dc;
    TkWinDCState state;
    register XArc *arcPtr, *endPtr;
    
    display->request++;
    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    pen = Blt_GCToPen(dc, gc);
    oldPen = SelectPen(dc, pen);
    brush = GetStockBrush(NULL_BRUSH);
    oldBrush = SelectBrush(dc, brush);
    endPtr = arcArr + nArcs;
    for (arcPtr = arcArr; arcPtr < endPtr; arcPtr++) {
	DrawArc(dc, gc->arc_mode, arcPtr, pen, 0);
    }
    DeleteBrush(SelectBrush(dc, oldBrush));
    DeletePen(SelectPen(dc, oldPen));
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * XFillArcs --
 *
 *	Draw a filled arc.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws a filled arc for each array element on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXFillArcs(
    Display *display,
    Drawable drawable,
    GC gc,
    XArc *arcArr,
    int nArcs)
{
    HBRUSH brush, oldBrush;
    HPEN pen, oldPen;
    HDC dc;
    register XArc *arcPtr, *endPtr;
    TkWinDCState state;

    display->request++;
    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    pen = Blt_GCToPen(dc, gc);
    oldPen = SelectPen(dc, pen);
    brush = CreateSolidBrush(gc->foreground);
    oldBrush = SelectBrush(dc, brush);
    endPtr = arcArr + nArcs;
    for (arcPtr = arcArr; arcPtr < endPtr; arcPtr++) {
	DrawArc(dc, gc->arc_mode, arcPtr, pen, brush);
    }
    DeleteBrush(SelectBrush(dc, oldBrush));
    DeletePen(SelectPen(dc, oldPen));
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawLines --
 *
 *	Draw connected lines.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Renders a series of connected lines.
 *
 *----------------------------------------------------------------------
 */

static void CALLBACK
DrawDot(
    int x, int y,		/* Coordinates of point */
    LPARAM clientData)
{				/* Line information */
    DashInfo *infoPtr = (DashInfo *) clientData;
    int count;

    infoPtr->count++;
    count = (infoPtr->count + infoPtr->offset) / infoPtr->nBits;
    if (count & 0x1) {
	SetPixelV(infoPtr->dc, x, y, infoPtr->color);
    }
}


void
Blt_EmulateXDrawLine(
    Display *display,
    Drawable drawable,
    GC gc,
    int x1, int y1,
    int x2, int y2)
{
    TkWinDCState state;
    HDC dc;

    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    if (gc->line_style != LineSolid) {
	/* Handle dotted lines specially */
	DashInfo info;

	if (!GetDashInfo(dc, gc, &info)) {
	    goto solidLine;
	}
	LineDDA(x1, y1, x2, y2, DrawDot, (LPARAM)&info);
    } else {
	HPEN pen, oldPen;
	HBRUSH brush, oldBrush;

      solidLine:
	pen = Blt_GCToPen(dc, gc);
	oldPen = SelectPen(dc, pen);
	brush = CreateSolidBrush(gc->foreground);
	oldBrush = SelectBrush(dc, brush);
	MoveToEx(dc, x1, y1, (LPPOINT)NULL);
	LineTo(dc, x2, y2);
	DeletePen(SelectPen(dc, oldPen));
	DeleteBrush(SelectBrush(dc, oldBrush));
    }
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

static void
DrawLine(
    Display *display,
    Drawable drawable,
    GC gc,
    POINT *points,
    int nPoints)
{
    TkWinDCState state;
    HDC dc;
    register int i, n;
    int start, extra, size;
    HPEN pen, oldPen;
    HBRUSH brush, oldBrush;

    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    pen = Blt_GCToPen(dc, gc);
    oldPen = SelectPen(dc, pen);
    brush = CreateSolidBrush(gc->foreground);
    oldBrush = SelectBrush(dc, brush);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    
    start = extra = 0;
    /*  
     * Depending if the line is wide (> 1 pixel), arbitrarily break
     * the line in sections of 100 points.  This bit of weirdness has
     * to do with wide geometric pens.  The longer the polyline, the
     * slower it draws.  The trade off is that we lose dash and 
     * cap uniformity for unbearably slow polyline draws.  
     */
    if (gc->line_width > 1) {
	size = 100;
    } else {
	size = nPoints;
    }
    for (i = nPoints; i > 0; i -= size) {
	n = MIN(i, size);
	Polyline(dc, points + start, n + extra);
	start += (n - 1);
	extra = 1;
    }
    DeletePen(SelectPen(dc, oldPen));
    DeleteBrush(SelectBrush(dc, oldBrush));
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

void
Blt_EmulateXDrawLines(
    Display *display,
    Drawable drawable,
    GC gc,
    XPoint *pointArr,
    int nPoints,
    int mode)
{
    if (drawable == None) {
	return;
    }
    if (gc->line_style != LineSolid) { /* Handle dotted lines specially */
	DashInfo info;
	TkWinDCState state;
	HDC dc;
	int result;

	dc = TkWinGetDrawableDC(display, drawable, &state);
	SetROP2(dc, tkpWinRopModes[gc->function]);
	result = GetDashInfo(dc, gc, &info);
	if (result) {
	    register XPoint *p1, *p2;
	    register int i;

	    p1 = pointArr;
	    p2 = p1 + 1;
	    for (i = 1; i < nPoints; i++, p1++, p2++) {
		LineDDA(p1->x, p1->y, p2->x, p2->y, DrawDot, (LPARAM)&info);
	    }
	    result = TCL_OK;
	}
	TkWinReleaseDrawableDC(drawable, dc, &state);
	if (result) {
	    return;
	}
    } else {
	POINT *points, *destPtr;
	XPoint *srcPtr, *endPtr;

	points = Blt_Malloc(sizeof(POINT) * nPoints);
	if (points == NULL) {
	    return;
	}
	endPtr = pointArr + nPoints;
	if (mode == CoordModeOrigin) {
	    destPtr = points;
	    for (srcPtr = pointArr; srcPtr < endPtr; srcPtr++) {
		destPtr->x = (int)srcPtr->x;
		destPtr->y = (int)srcPtr->y;
		destPtr++;
	    }
	} else {
	    POINT *lastPtr;
	    
	    srcPtr = pointArr;
	    destPtr = points;
	    destPtr->x = (int)srcPtr->x;
	    destPtr->y = (int)srcPtr->y;
	    lastPtr = destPtr;
	    srcPtr++, destPtr++;
	    for (/*empty*/; srcPtr < endPtr; srcPtr++) {
		destPtr->x = lastPtr->x + (int)srcPtr->x;
		destPtr->y = lastPtr->y + (int)srcPtr->y;
		lastPtr = destPtr;
		destPtr++;
	    }
	}
	DrawLine(display, drawable, gc, points, nPoints);
	Blt_Free(points);
    }
}



/*
 *----------------------------------------------------------------------
 *
 * Blt_EmultateXDrawSegments --
 *
 *	Draws multiple, unconnected lines. For each segment, draws a
 *	line between (x1, y1) and (x2, y2).  It draws the lines in the
 *	order listed in the array of XSegment structures and does not
 *	perform joining at coincident endpoints.  For any given line,
 *	does not draw a pixel more than once. If lines intersect, the
 *	intersecting pixels are drawn multiple times.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws unconnected line segments on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawSegments(
    Display *display,
    Drawable drawable,
    GC gc,
    XSegment *segArr,
    int nSegments)
{
    HDC dc;
    register XSegment *segPtr, *endPtr;
    TkWinDCState state;

    display->request++;
    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    if (gc->line_style != LineSolid) {
	/* Handle dotted lines specially */
	DashInfo info;

	if (!GetDashInfo(dc, gc, &info)) {
	    goto solidLine;
	}
	endPtr = segArr + nSegments;
	for (segPtr = segArr; segPtr < endPtr; segPtr++) {
	    info.count = 0; /* Reset dash counter after every segment. */
	    LineDDA(segPtr->x1, segPtr->y1, segPtr->x2, segPtr->y2, DrawDot, 
		(LPARAM)&info);
	}
    } else {
	HPEN pen, oldPen;

      solidLine:
	pen = Blt_GCToPen(dc, gc);
	oldPen = SelectPen(dc, pen);
	endPtr = segArr + nSegments;
	for (segPtr = segArr; segPtr < endPtr; segPtr++) {
	    MoveToEx(dc, segPtr->x1, segPtr->y1, (LPPOINT)NULL);
	    LineTo(dc, segPtr->x2, segPtr->y2);
	}
	DeletePen(SelectPen(dc, oldPen));
    }
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmultateXDrawRectangle --
 *
 *       Draws the outlines of the specified rectangle as if a
 *       five-point PolyLine protocol request were specified for each
 *       rectangle:
 *
 *             [x,y] [x+width,y] [x+width,y+height] [x,y+height]
 *             [x,y]
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws a rectangle on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawRectangle(
    Display *display,
    Drawable drawable,
    GC gc,
    int x, int y,
    unsigned int width,
    unsigned int height)
{
    TkWinDCState state;
    HPEN pen, oldPen;
    HBRUSH brush, oldBrush;
    HDC dc;

    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    pen = Blt_GCToPen(dc, gc);
    brush = GetStockObject(NULL_BRUSH);
    oldPen = SelectPen(dc, pen);
    oldBrush = SelectBrush(dc, brush);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    if (gc->line_style != LineSolid) {
	/* Handle dotted lines specially */
	register int x2, y2;
	DashInfo info;

	if (!GetDashInfo(dc, gc, &info)) {
	    goto solidLine;
	}
	x2 = x + width;
	y2 = y + height;
	LineDDA(x, y, x2, y, DrawDot, (LPARAM)&info);
	LineDDA(x2, y, x2, y2, DrawDot, (LPARAM)&info);
	LineDDA(x2, y2, x, y2, DrawDot, (LPARAM)&info);
	LineDDA(x, y2, x, y, DrawDot, (LPARAM)&info);
    } else {
      solidLine:
	Rectangle(dc, x, y, x + width + 1, y + height + 1);
    }
    DeletePen(SelectPen(dc, oldPen));
    DeleteBrush(SelectBrush(dc, oldBrush));
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmulateXDrawPoints --
 *
 *	Uses the foreground pixel and function components of the GC to
 *	draw a multiple points into the specified drawable.
 *      CoordModeOrigin treats all coordinates as relative to the
 *	origin, and CoordModePrevious treats all coordinates after
 *	the first as relative to the previous point.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws points on the specified drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawPoints(
    Display *display,
    Drawable drawable,
    GC gc,
    XPoint *pointArr,
    int nPoints,
    int mode)
{				/* Ignored. CoordModeOrigin is assumed. */
    HDC dc;
    register XPoint *pointPtr, *endPtr;
    TkWinDCState state;

    display->request++;
    if (drawable == None) {
	return;
    }
    dc = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(dc, tkpWinRopModes[gc->function]);
    endPtr = pointArr + nPoints;
    for (pointPtr = pointArr; pointPtr < endPtr; pointPtr++) {
	SetPixelV(dc, pointPtr->x, pointPtr->y, gc->foreground);
    }
    TkWinReleaseDrawableDC(drawable, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmultateXReparentWindow --
 *
 *	If the specified window is mapped, automatically performs an
 *	UnmapWindow request on it, removes it from its current
 *	position in the hierarchy, and inserts it as the child of the
 *	specified parent.  The window is placed in the stacking order
 *	on top with respect to sibling windows.
 *
 *	Note: In WIN32 you can't reparent to/from another application.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Reparents the specified window.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXReparentWindow(
    Display *display,
    Window window,
    Window parent,
    int x,
    int y)
{
    HWND child, newParent;

    child = Tk_GetHWND(window);
    newParent = Tk_GetHWND(parent);
    SetParent(child, newParent);
    SetWindowLong(child, GWL_STYLE, WS_CHILD | WS_CLIPCHILDREN |
	WS_CLIPSIBLINGS);

    XMoveWindow(display, window, x, y);
    XRaiseWindow(display, window);
    XMapWindow(display, window);
}

void
Blt_EmulateXSetDashes(
    Display *display,
    GC gc,
    int dashOffset,
    _Xconst char *dashList,
    int n)
{
    gc->dashes = (unsigned char)strlen(dashList);
    gc->dash_offset = (int)dashList;
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmultateXDrawString --
 *
 *	Draw a single string in the current font.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Renders the specified string in the drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXDrawString(
    Display *display,
    Drawable drawable,
    GC gc,
    int x,
    int y,
    _Xconst char *string,
    int length)
{
    if (drawable == None) {
	return;
    }
#ifdef TK_DRAWCHARS_ANGLE
    Tk_DrawChars(display, drawable, gc, (Tk_Font)gc->font, string, length, 
		 x, y, 0.);
#else
    Tk_DrawChars(display, drawable, gc, (Tk_Font)gc->font, string, length, 
	x, y);
#endif
}

static void
TileArea(destDC, srcDC, tileOriginX, tileOriginY, tileWidth, tileHeight,
	 x, y, width, height)
    HDC destDC, srcDC;
    int tileOriginX, tileOriginY, tileWidth,  tileHeight;
    int x, y, width, height;
{
    int destX, destY;
    int destWidth, destHeight;
    int srcX, srcY;
    int xOrigin, yOrigin;
    int delta;
    int left, top, right, bottom;

    xOrigin = x, yOrigin = y;
    if (x < tileOriginX) {
	delta = (tileOriginX - x) % tileWidth;
	if (delta > 0) {
	    xOrigin -= (tileWidth - delta);
	}
    } else if (x > tileOriginX) {
	delta = (x - tileOriginX) % tileWidth;
	if (delta > 0) {
	    xOrigin -= delta;
	}
    }
    if (y < tileOriginY) {
	delta = (tileOriginY - y) % tileHeight;
	if (delta > 0) {
	    yOrigin -= (tileHeight - delta);
	}
    } else if (y >= tileOriginY) {
	delta = (y - tileOriginY) % tileHeight;
	if (delta > 0) {
	    yOrigin -= delta;
	}
    }
#ifdef notdef
    PurifyPrintf("tile is (%d,%d,%d,%d)\n", tileOriginX, tileOriginY, 
		 tileWidth, tileHeight);
    PurifyPrintf("region is (%d,%d,%d,%d)\n", x, y, width, height);
    PurifyPrintf("starting at %d,%d\n", xOrigin, yOrigin);
#endif
    left = x;
    right = x + width;
    top = y;
    bottom = y + height;
    for (y = yOrigin; y < bottom; y += tileHeight) {
	srcY = 0;
	destY = y;
	destHeight = tileHeight;
	if (y < top) {
	    srcY = (top - y);
	    destHeight = tileHeight - srcY;
	    destY = top;
	} 
	if ((destY + destHeight) > bottom) {
	    destHeight = (bottom - destY);
	}
	for (x = xOrigin; x < right; x += tileWidth) {
	    srcX = 0;
	    destX = x;
	    destWidth = tileWidth;
	    if (x < left) {
		srcX = (left - x);
		destWidth = tileWidth - srcX;
		destX = left;
	    } 
	    if ((destX + destWidth) > right) {
		destWidth = (right - destX);
	    }
#ifdef notdef
	    PurifyPrintf("drawing pattern (%d,%d,%d,%d) at %d,%d\n",
		 srcX , srcY, destWidth, destHeight, destX, destY);
#endif
	    BitBlt(destDC, destX, destY, destWidth, destHeight, 
		srcDC, srcX, srcY, SRCCOPY);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmultateXFillRectangles --
 *
 *	Fill multiple rectangular areas in the given drawable.
 *	Handles tiling.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws onto the specified drawable.
 *
 *----------------------------------------------------------------------
 */

void
Blt_EmulateXFillRectangles(
    Display *display,
    Drawable drawable,
    GC gc,
    XRectangle *rectArr,
    int nRectangles)
{
    BITMAP bm;
    HBITMAP oldBitmap, hBitmap;
    HBRUSH oldBrush, hFgBrush, hBgBrush, hBrush;
    HDC hDC;
    HDC memDC;
    RECT rect;
    TkWinDCState state;
    TkWinDrawable *twdPtr;
    register XRectangle *rectPtr, *endPtr;
    
    if (drawable == None) {
	return;
    }
    hDC = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(hDC, tkpWinRopModes[gc->function]);

    switch(gc->fill_style) {
    case FillTiled:
	if (gc->tile == None) {
	    goto fillSolid;
        }
#ifdef notdef
	if ((GetDeviceCaps(hDC, RASTERCAPS) & RC_BITBLT) == 0) {
	    goto fillSolid;
	}
#endif
        twdPtr = (TkWinDrawable *)gc->tile;
	GetObject(twdPtr->bitmap.handle, sizeof(BITMAP), &bm);
	memDC = CreateCompatibleDC(hDC);
	oldBitmap = SelectBitmap(memDC, twdPtr->bitmap.handle);
	endPtr = rectArr + nRectangles;
        for (rectPtr = rectArr; rectPtr < endPtr; rectPtr++) {
	    TileArea(hDC, memDC, gc->ts_x_origin, gc->ts_y_origin, bm.bmWidth, 
		bm.bmHeight, (int)rectPtr->x, (int)rectPtr->y, 
		(int)rectPtr->width, (int)rectPtr->height);
        }
	SelectBitmap(memDC, oldBitmap);
	DeleteDC(memDC);
        break; 

    case FillOpaqueStippled:
    case FillStippled:
	if (gc->stipple == None) {
	    goto fillSolid;
	}
        twdPtr = (TkWinDrawable *)gc->stipple;
	if (twdPtr->type != TWD_BITMAP) {
	    panic("unexpected drawable type in stipple");
	}
	hBrush = CreatePatternBrush(twdPtr->bitmap.handle);
	SetBrushOrgEx(hDC, gc->ts_x_origin, gc->ts_y_origin, NULL);
	oldBrush = SelectBrush(hDC, hBrush);
	memDC = CreateCompatibleDC(hDC);

	/*
	 * For each rectangle, create a drawing surface which is the size of
	 * the rectangle and fill it with the background color.  Then merge the
	 * result with the stipple pattern.
	 */
        hFgBrush = CreateSolidBrush(gc->foreground);
	hBgBrush = CreateSolidBrush(gc->background);
	endPtr = rectArr + nRectangles;
        for (rectPtr = rectArr; rectPtr < endPtr; rectPtr++) {
	    hBitmap = CreateCompatibleBitmap(hDC, rectPtr->width, 
		rectPtr->height);
	    oldBitmap = SelectObject(memDC, hBitmap);
	    rect.left = rect.top = 0;
	    rect.right = rectPtr->width;
	    rect.bottom = rectPtr->height;
	    FillRect(memDC, &rect, hFgBrush);
	    BitBlt(hDC, rectPtr->x, rectPtr->y, rectPtr->width, rectPtr->height,
		memDC, 0, 0, COPYBG);
	    if (gc->fill_style == FillOpaqueStippled) {
		FillRect(memDC, &rect, hBgBrush);
		BitBlt(hDC, rectPtr->x, rectPtr->y, rectPtr->width, 
			rectPtr->height, memDC, 0, 0, COPYFG);
	    }
	    SelectObject(memDC, oldBitmap);
	    DeleteObject(hBitmap);
	}
	DeleteBrush(hFgBrush);
	DeleteBrush(hBgBrush);
	DeleteDC(memDC);
	SelectBrush(hDC, oldBrush);
	DeleteBrush(hBrush);
 	break;

    case FillSolid:
	fillSolid:
	memDC = CreateCompatibleDC(hDC);
        hFgBrush = CreateSolidBrush(gc->foreground);
	endPtr = rectArr + nRectangles;
        for (rectPtr = rectArr; rectPtr < endPtr; rectPtr++) {
	    hBitmap = CreateCompatibleBitmap(hDC, rectPtr->width, 
		rectPtr->height);
	    oldBitmap = SelectObject(memDC, hBitmap);
	    rect.left = rect.top = 0;
	    rect.right = rectPtr->width;
	    rect.bottom = rectPtr->height;
	    FillRect(memDC, &rect, hFgBrush);
	    BitBlt(hDC, rectPtr->x, rectPtr->y, rectPtr->width, rectPtr->height,
		   memDC, 0, 0, SRCCOPY);
	    SelectObject(memDC, oldBitmap);
	    DeleteObject(hBitmap);
	}
	DeleteBrush(hFgBrush);
	DeleteDC(memDC);
 	break;
    }
    TkWinReleaseDrawableDC(drawable, hDC, &state);
}

void
Blt_EmulateXFillRectangle(
    Display *display,
    Drawable drawable,
    GC gc,
    int x,
    int y,
    unsigned int width,
    unsigned int height)
{
    HDC hDC;
    RECT rect;
    TkWinDCState state;

    if (drawable == None) {
	return;
    }
    hDC = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(hDC, tkpWinRopModes[gc->function]);
    rect.left = rect.top = 0;
    rect.right = width;
    rect.bottom = height;

    switch(gc->fill_style) {
    case FillTiled:
	{
	    TkWinDrawable *twdPtr;
	    HBITMAP oldBitmap;
	    HDC memDC;
	    BITMAP bm;

	    if (gc->tile == None) { 
		goto fillSolid;
	    }
#ifdef notdef
	    if ((GetDeviceCaps(hDC, RASTERCAPS) & RC_BITBLT) == 0) {
		goto fillSolid;
	    }
#endif
	    twdPtr = (TkWinDrawable *)gc->tile;
	    /* The tiling routine needs to know the size of the bitmap */
	    GetObject(twdPtr->bitmap.handle, sizeof(BITMAP), &bm);

	    memDC = CreateCompatibleDC(hDC);
	    oldBitmap = SelectBitmap(memDC, twdPtr->bitmap.handle);
	    TileArea(hDC, memDC, gc->ts_x_origin, gc->ts_y_origin, bm.bmWidth, 
		     bm.bmHeight, x, y, width, height);
	    SelectBitmap(memDC, oldBitmap);
	    DeleteDC(memDC);
	}
	break; 
	    
    case FillOpaqueStippled:
    case FillStippled:
	{
	    TkWinDrawable *twdPtr;
	    HBRUSH oldBrush, hBrush;
	    HBRUSH hBrushFg, hBrushBg;
	    HBITMAP oldBitmap, hBitmap;
	    HDC memDC;

	    if (gc->stipple == None) {
		goto fillSolid;
	    }
	    twdPtr = (TkWinDrawable *)gc->stipple;
	    if (twdPtr->type != TWD_BITMAP) {
		panic("unexpected drawable type in stipple");
	    }
	    hBrush = CreatePatternBrush(twdPtr->bitmap.handle);
	    SetBrushOrgEx(hDC, gc->ts_x_origin, gc->ts_y_origin, NULL);
	    oldBrush = SelectBrush(hDC, hBrush);
	    memDC = CreateCompatibleDC(hDC);
	    
	    hBrushFg = CreateSolidBrush(gc->foreground);
	    hBrushBg = CreateSolidBrush(gc->background);
	    hBitmap = CreateCompatibleBitmap(hDC, width, height);
	    oldBitmap = SelectObject(memDC, hBitmap);
	    FillRect(memDC, &rect, hBrushFg);
	    SetBkMode(hDC, TRANSPARENT);
	    BitBlt(hDC, x, y, width, height, memDC, 0, 0, COPYFG);
	    if (gc->fill_style == FillOpaqueStippled) {
		FillRect(memDC, &rect, hBrushBg);
		BitBlt(hDC, x, y, width, height, memDC, 0, 0, COPYBG);
	    }
	    SelectBrush(hDC, oldBrush);
	    SelectBitmap(memDC, oldBitmap);
	    DeleteBrush(hBrushFg);
	    DeleteBrush(hBrushBg);
	    DeleteBrush(hBrush);
	    DeleteBitmap(hBitmap);
	    DeleteDC(memDC);
	}
	break;

    case FillSolid:
	{
	    HBRUSH hBrush;
	    HBITMAP oldBitmap, hBitmap;
	    HDC memDC;

	fillSolid:
	    /* TkWinFillRect(hDC, x, y, width, height, gc->foreground);  */
	    memDC = CreateCompatibleDC(hDC);
	    hBrush = CreateSolidBrush(gc->foreground);
	    hBitmap = CreateCompatibleBitmap(hDC, width, height);
	    oldBitmap = SelectBitmap(memDC, hBitmap);
	    rect.left = rect.top = 0;
	    rect.right = width;
	    rect.bottom = height;
	    FillRect(memDC, &rect, hBrush);
	    BitBlt(hDC, x, y, width, height, memDC, 0, 0, SRCCOPY);
	    SelectObject(memDC, oldBitmap);
	    DeleteBitmap(hBitmap);
	    DeleteBrush(hBrush);
	    DeleteDC(memDC);
	}
	break;
    }
    TkWinReleaseDrawableDC(drawable, hDC, &state);
}

static BOOL
DrawChars(HDC dc, int x, int y, char *string, int length)
{
    BOOL result;

#if (TCL_VERSION_NUMBER >= _VERSION(8,1,0)) 
    if (systemEncoding == NULL) {
	result = TextOutA(dc, x, y, string, length);
    } else {
	const unsigned short *wstring;
	Tcl_DString dString;

	Tcl_DStringInit(&dString);
	Tcl_UtfToExternalDString(systemEncoding, string, length, &dString);
	length = Tcl_NumUtfChars(string, -1);
	wstring = (const unsigned short *)Tcl_DStringValue(&dString);
	result = TextOutW(dc, x, y, wstring, length);
	Tcl_DStringFree(&dString);
    }
#else 
    result = TextOutA(dc, x, y, string, length);
#endif /* TCL_VERSION_NUMBER >= 8.1.0 */
    return result;
}

int
Blt_DrawRotatedText(
    Display *display,
    Drawable drawable,
    int x, int y,
    double theta,
    TextStyle *tsPtr,
    TextLayout *textPtr)
{
    HFONT hFont, oldFont;
    TkWinDCState state;
    HDC hDC;
    int isActive;
    int bbWidth, bbHeight;
    double rotWidth, rotHeight;
    double sinTheta, cosTheta;
    Point2D p, q, center;
    register TextFragment *fragPtr, *endPtr;
#if (TCL_VERSION_NUMBER >=  _VERSION(8,1,0)) 
    static int initialized = 0;

    if (!initialized) {
	if (Blt_GetPlatformId() == VER_PLATFORM_WIN32_NT) {
	    /*
	     * If running NT, then we will be calling some Unicode functions 
	     * explictly.  So, even if the Tcl system encoding isn't Unicode, 
	     * make sure we convert to/from the Unicode char set. 
	     */
	    systemEncoding = Tcl_GetEncoding(NULL, "unicode");
	} 
	initialized = 1;
    }
#endif
    hFont = CreateRotatedFont(tsPtr->gc->font, theta);
    if (hFont == NULL) {
	return FALSE;
    }
    isActive = (tsPtr->state & STATE_ACTIVE);
    hDC = TkWinGetDrawableDC(display, drawable, &state);
    SetROP2(hDC, tsPtr->gc->function);
    oldFont = SelectFont(hDC, hFont);

    Blt_GetBoundingBox(textPtr->width, textPtr->height, theta, &rotWidth, 
		       &rotHeight, (Point2D *)NULL);
    bbWidth = ROUND(rotWidth);
    bbHeight = ROUND(rotHeight);
    Blt_TranslateAnchor(x, y, bbWidth, bbHeight, tsPtr->anchor, &x, &y);
    center.x = (double)textPtr->width * -0.5;
    center.y = (double)textPtr->height * -0.5;
    theta = (-theta / 180.0) * M_PI;
    sinTheta = sin(theta), cosTheta = cos(theta);

    endPtr = textPtr->fragArr + textPtr->nFrags;

    for (fragPtr = textPtr->fragArr; fragPtr < endPtr; fragPtr++) {
	p.x = center.x + (double)fragPtr->x;
	p.y = center.y + (double)fragPtr->y;
	q.x = x + (p.x * cosTheta) - (p.y * sinTheta) + (bbWidth * 0.5);
	q.y = y + (p.x * sinTheta) + (p.y * cosTheta) + (bbHeight * 0.5);
	fragPtr->sx = ROUND(q.x);
	fragPtr->sy = ROUND(q.y);
    }
    SetBkMode(hDC, TRANSPARENT);
    SetTextAlign(hDC, TA_LEFT | TA_BASELINE);

    if (tsPtr->state & (STATE_DISABLED | STATE_EMPHASIS)) {
	TkBorder *borderPtr = (TkBorder *) tsPtr->border;
	XColor *color1, *color2;
	
	color1 = borderPtr->lightColor, color2 = borderPtr->darkColor;
	if (tsPtr->state & STATE_EMPHASIS) {
	    XColor *hold;
	    
	    hold = color1, color1 = color2, color2 = hold;
	}
	if (color1 != NULL) {
	    SetTextColor(hDC, color1->pixel);
	    for (fragPtr = textPtr->fragArr; fragPtr < endPtr; fragPtr++) {
		DrawChars(hDC, fragPtr->sx, fragPtr->sy, fragPtr->text, 
			fragPtr->count); 
	    }
	}
	if (color2 != NULL) {
	    SetTextColor(hDC, color2->pixel);
	    for (fragPtr = textPtr->fragArr; fragPtr < endPtr; fragPtr++) {
		DrawChars(hDC, fragPtr->sx + 1, fragPtr->sy + 1, fragPtr->text, 
			fragPtr->count);
	    }
	}
	goto done;		/* Done */
    }
    SetBkMode(hDC, TRANSPARENT);
    if ((tsPtr->shadow.offset > 0) && (tsPtr->shadow.color != NULL)) {
	SetTextColor(hDC, tsPtr->shadow.color->pixel);
	for (fragPtr = textPtr->fragArr; fragPtr < endPtr; fragPtr++) {
	    DrawChars(hDC, fragPtr->sx + tsPtr->shadow.offset, 
		    fragPtr->sy + tsPtr->shadow.offset, fragPtr->text, 
		    fragPtr->count);
	}
    }
    if (isActive) {
	SetTextColor(hDC, tsPtr->activeColor->pixel);
    } else {
	SetTextColor(hDC, tsPtr->color->pixel);
    }	    

    for (fragPtr = textPtr->fragArr; fragPtr < endPtr; fragPtr++) {
	DrawChars(hDC, fragPtr->sx, fragPtr->sy, fragPtr->text, 
		    fragPtr->count);
    }

    if (isActive) {
	SetTextColor(hDC, tsPtr->color->pixel);
    }	    
 done:
    SelectFont(hDC, oldFont);
    DeleteFont(hFont);
    TkWinReleaseDrawableDC(drawable, hDC, &state);
    return TRUE;
}

static void
DrawPixel(
    HDC hDC, 
    int x, 
    int y, 
    COLORREF color)
{
    HDC memDC;
    HBRUSH hBrushFg;
    HBITMAP oldBitmap, hBitmap;
    RECT rect;
    int size;
 
    size = 1;
    memDC = CreateCompatibleDC(hDC);
    hBrushFg = CreateSolidBrush(color);
    hBitmap = CreateCompatibleBitmap(hDC, size, size);
    oldBitmap = SelectObject(memDC, hBitmap);
    rect.left = rect.top = 0;
    rect.right = rect.bottom = size;
    FillRect(memDC, &rect, hBrushFg);
    BitBlt(hDC, x, y, size, size, memDC, 0, 0, SRCCOPY);
    SelectObject(memDC, oldBitmap);
    DeleteObject(hBitmap);
    DeleteBrush(hBrushFg);
    DeleteDC(memDC);
}

/*
 *----------------------------------------------------------------------
 *
 * PixelateBitmap --
 *
 *	Draws a masked bitmap in given device (should be printer)
 *	context.  Bit operations on print devices usually fail because
 *	there's no way to read back from the device surface to get the
 *	previous pixel values, rendering BitBlt useless. The bandaid
 *	solution here is to draw 1x1 pixel rectangles at each
 *	coordinate as directed by the the mask and source bitmaps.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws onto the specified drawable.
 *
 *----------------------------------------------------------------------
 */
static void
PixelateBitmap(
    Display *display,
    Drawable drawable,
    Pixmap srcBitmap,
    Pixmap maskBitmap,
    int width,
    int height,
    GC gc,
    int destX,
    int destY)
{
    register int x, y;
    register int dx, dy;
    int pixel;
    unsigned char *srcBits;
    register unsigned char *srcPtr;
    int bitPos, bytesPerRow;
    HDC hDC;
    TkWinDCState state;

    srcBits = Blt_GetBitmapData(display, srcBitmap, width, height, 
	&bytesPerRow);
    if (srcBits == NULL) {
	return;
    }
    hDC = TkWinGetDrawableDC(display, drawable, &state);
    if (maskBitmap != None) {
        register unsigned char *maskPtr;
        unsigned char *maskBits;
        maskBits = Blt_GetBitmapData(display, maskBitmap, width, height,
	    &bytesPerRow);
        bytesPerRow = ((width + 31) & ~31) / 8;
        for (dy = destY, y = height - 1; y >= 0; y--, dy++) {
	    maskPtr = maskBits + (bytesPerRow * y);
	    srcPtr = srcBits + (bytesPerRow * y);
	    for (dx = destX, x = 0; x < width; x++, dx++) {
	        bitPos = x % 8;
	        pixel = (*maskPtr & (0x80 >> bitPos));
	        if (pixel) {
		    pixel = (*srcPtr & (0x80 >> bitPos));
		    DrawPixel(hDC, dx, dy, 
		        (pixel) ? gc->foreground : gc->background);
	        }
	        if (bitPos == 7) {
		    srcPtr++, maskPtr++;
	        }
	    }			/* x */
        }
        Blt_Free(maskBits);
    } else {
        bytesPerRow = ((width + 31) & ~31) / 8;
        for (dy = destY, y = height - 1; y >= 0; y--, dy++) {
	    srcPtr = srcBits + (bytesPerRow * y);
	    for (dx = destX, x = 0; x < width; x++, dx++) {
	        bitPos = x % 8;
		pixel = (*srcPtr & (0x80 >> bitPos));
		DrawPixel(hDC, dx, dy, 
		        (pixel) ? gc->foreground : gc->background);
	        if (bitPos == 7) {
		    srcPtr++;
	        }
	    }
	}
    }
    TkWinReleaseDrawableDC(drawable, hDC, &state);
    Blt_Free(srcBits);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmulateXCopyPlane --
 *
 *	Simplified version of XCopyPlane.  Right now it ignores
 *		function, 
 *		clip_x_origin, 
 *		clip_y_origin
 *
 *	The plane argument must always be 1.
 *
 *	This routine differs from the Tk version in how it handles 
 *	transparency.  It uses a different method of drawing transparent
 *	bitmaps that doesn't copy the background or use brushes.  The
 *	second change is to call a special routine when the destDC is
 *	a printer.   Stippling is done by a very slow brute-force
 *	method of drawing 1x1 rectangles for each pixel (bleech).  
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Changes the destination drawable.
 *
 *----------------------------------------------------------------------
 */
void
Blt_EmulateXCopyPlane(
    Display *display,
    Drawable src,
    Drawable dest,
    GC gc,
    int srcX,
    int srcY,
    unsigned int width,
    unsigned int height,
    int destX,
    int destY,
    unsigned long plane)
{
    HDC srcDC, destDC;
    TkWinDCState srcState, destState;
    TkpClipMask *clipPtr = (TkpClipMask *) gc->clip_mask;

    display->request++;

    if (plane != 1) {
	panic("Unexpected plane specified for XCopyPlane");
    }
    srcDC = TkWinGetDrawableDC(display, src, &srcState);

    if (src != dest) {
	destDC = TkWinGetDrawableDC(display, dest, &destState);
    } else {
	destDC = srcDC;
    }
    if ((clipPtr == NULL) || (clipPtr->type == TKP_CLIP_REGION)) {
	/*
	 * Case 1: opaque bitmaps.  Windows handles the conversion
	 * from one bit to multiple bits by setting 0 to the
	 * foreground color, and 1 to the background color (seems
	 * backwards, but there you are).
	 */
	if ((clipPtr != NULL) && (clipPtr->type == TKP_CLIP_REGION)) {
	    SelectClipRgn(destDC, (HRGN) clipPtr->value.region);
	    OffsetClipRgn(destDC, gc->clip_x_origin, gc->clip_y_origin);
	}
	SetBkMode(destDC, OPAQUE);
	SetBkColor(destDC, gc->foreground);
	SetTextColor(destDC, gc->background);
	BitBlt(destDC, destX, destY, width, height, srcDC, srcX, srcY,
	    SRCCOPY);

	SelectClipRgn(destDC, NULL);

    } else if (clipPtr->type == TKP_CLIP_PIXMAP) {
	Drawable mask;
	/*
	 * Case 2: transparent bitmaps are handled by setting the
	 * destination to the foreground color whenever the source
	 * pixel is set.
	 */
	/*
	 * Case 3: two arbitrary bitmaps.  Copy the source rectangle
	 * into a color pixmap.  Use the result as a brush when
	 * copying the clip mask into the destination.
	 */
	mask = clipPtr->value.pixmap;

#if WINDEBUG
	PurifyPrintf("mask %s src\n", (mask == src) ? "==" : "!=");
	PurifyPrintf("GetDeviceCaps=%x\n", 
		GetDeviceCaps(destDC, TECHNOLOGY) & DT_RASDISPLAY);
#endif
	{
	    HDC maskDC;
	    TkWinDCState maskState;

	    if (mask != src) {
		maskDC = TkWinGetDrawableDC(display, mask, &maskState);
	    } else {
		maskDC = srcDC;
	    }
	    SetBkMode(destDC, OPAQUE);
	    SetTextColor(destDC, gc->background);
	    SetBkColor(destDC, gc->foreground);
	    BitBlt(destDC, destX, destY, width, height, srcDC, srcX, srcY, 
		   SRCINVERT);
	    /* 
	     * Make sure we treat the mask as a monochrome bitmap. 
	     * We can get alpha-blending with non-black/white fg/bg 
	     * color selections.
	     */
	    SetTextColor(destDC, RGB(255,255,255));
	    SetBkColor(destDC, RGB(0,0,0));

	    /* FIXME: Handle gc->clip_?_origin's */ 
	    BitBlt(destDC, destX, destY, width, height, maskDC, 0, 0, SRCAND);

	    SetTextColor(destDC, gc->background);
	    SetBkColor(destDC, gc->foreground);
	    BitBlt(destDC, destX, destY, width, height, srcDC, srcX, srcY, 
		   SRCINVERT);
	    if (mask != src) {
		TkWinReleaseDrawableDC(mask, maskDC, &maskState);
	    }
	}
    }
    if (src != dest) {
	TkWinReleaseDrawableDC(dest, destDC, &destState);
    }
    TkWinReleaseDrawableDC(src, srcDC, &srcState);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmulateXCopyArea --
 *
 *	Copies data from one drawable to another using block transfer
 *	routines.  The small enhancement over the version in Tk is
 *	that it doesn't assume that the source and destination devices
 *	have the same resolution. This isn't true when the destination
 *	device is a printer.
 *
 *	FIXME: not true anymore.  delete this routine.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Data is moved from a window or bitmap to a second window,
 *	bitmap, or printer.
 *
 *---------------------------------------------------------------------- 
 */
void
Blt_EmulateXCopyArea(
    Display *display,
    Drawable src,
    Drawable dest,
    GC gc,
    int srcX,			/* Source X-coordinate */
    int srcY,			/* Source Y-coordinate. */
    unsigned int width,		/* Width of area. */
    unsigned int height,	/* Height of area. */
    int destX,			/* Destination X-coordinate (in screen 
				 * coordinates). */
    int destY)			/* Destination Y-coordinate (in screen
				 * coordinates). */
{
    HDC srcDC, destDC;
    TkWinDCState srcState, destState;
    TkpClipMask *clipPtr;

    srcDC = TkWinGetDrawableDC(display, src, &srcState);
    if (src != dest) {
	destDC = TkWinGetDrawableDC(display, dest, &destState);
    } else {
	destDC = srcDC;
    }
    clipPtr = (TkpClipMask *)gc->clip_mask;
    if ((clipPtr != NULL) && (clipPtr->type == TKP_CLIP_REGION)) {
	SelectClipRgn(destDC, (HRGN)clipPtr->value.region);
	OffsetClipRgn(destDC, gc->clip_x_origin, gc->clip_y_origin);
    }

    BitBlt(destDC, destX, destY, width, height, srcDC, srcX, srcY, 
		bltModes[gc->function]);
    SelectClipRgn(destDC, NULL);

    if (src != dest) {
	TkWinReleaseDrawableDC(dest, destDC, &destState);
    }
    TkWinReleaseDrawableDC(src, srcDC, &srcState);
}

static void
StippleRegion(
    Display *display,
    HDC hDC,			/* Device context: For polygons, clip
				 * region will be installed. */
    GC gc,
    int x, int y,
    int width, int height)
{
    BITMAP bm;
    HBITMAP oldBitmap;
    HDC maskDC, memDC;
    Pixmap mask;
    TkWinDCState maskState;
    TkWinDrawable *twdPtr;
    int destX, destY, destWidth, destHeight;
    int dx, dy;
    int left, top, right, bottom;
    int srcX, srcY;
    int startX, startY;		/* Starting upper left corner of region. */
    
    twdPtr = (TkWinDrawable *)gc->stipple;
    GetObject(twdPtr->bitmap.handle, sizeof(BITMAP), &bm);

    startX = x;
    if (x < gc->ts_x_origin) {
	dx = (gc->ts_x_origin - x) % bm.bmWidth;
	if (dx > 0) {
	    startX -= (bm.bmWidth - dx);
	}
    } else if (x > gc->ts_x_origin) {
	dx = (x - gc->ts_x_origin) % bm.bmWidth;
	if (dx > 0) {
	    startX -= dx;
	}
    }
    startY = y;
    if (y < gc->ts_y_origin) {
	dy = (gc->ts_y_origin - y) % bm.bmHeight;
	if (dy > 0) {
	    startY -= (bm.bmHeight - dy);
	}
    } else if (y >= gc->ts_y_origin) {
	dy = (y - gc->ts_y_origin) % bm.bmHeight;
	if (dy > 0) {
	    startY -= dy;
	}
    }
#ifdef notdef
    PurifyPrintf("tile is (%d,%d,%d,%d)\n", gc->ts_x_origin, gc->ts_y_origin, 
		 bm.bmWidth, bm.bmHeight);
    PurifyPrintf("region is (%d,%d,%d,%d)\n", x, y, width, height);
    PurifyPrintf("starting at %d,%d\n", startX, startY);
#endif
    left = x;
    right = x + width;
    top = y;
    bottom = y + height;

    maskDC = memDC = CreateCompatibleDC(hDC);
    oldBitmap = SelectBitmap(memDC, twdPtr->bitmap.handle);
    mask = gc->stipple;
    if (gc->fill_style == FillStippled) { /* With transparency. */
	if (gc->clip_mask != None) {
	    TkpClipMask *clipPtr;
	    
	    mask = gc->stipple;
	    clipPtr = (TkpClipMask *)gc->clip_mask;
	    if  (clipPtr->type == TKP_CLIP_PIXMAP) {
		mask = clipPtr->value.pixmap;
	    }
	}
	if (mask != gc->stipple) {
	    maskDC = TkWinGetDrawableDC(display, mask, &maskState);
	}
    }

    for (y = startY; y < bottom; y += bm.bmHeight) {
	srcY = 0;
	destY = y;
	destHeight = bm.bmHeight;
	if (y < top) {
	    srcY = (top - y);
	    destHeight = bm.bmHeight - srcY;
	    destY = top;
	} 
	if ((destY + destHeight) > bottom) {
	    destHeight = (bottom - destY);
	}
	for (x = startX; x < right; x += bm.bmWidth) {
	    srcX = 0;
	    destX = x;
	    destWidth = bm.bmWidth;
	    if (x < left) {
		srcX = (left - x);
		destWidth = bm.bmWidth - srcX;
		destX = left;
	    } 
	    if ((destX + destWidth) > right) {
		destWidth = (right - destX);
	    }
#ifdef notdef
	    PurifyPrintf("drawing pattern (%d,%d,%d,%d) at %d,%d\n",
		 srcX , srcY, destWidth, destHeight, destX, destY);
#endif
	    if (gc->fill_style == FillStippled) { /* With transparency. */
		SetBkMode(hDC, OPAQUE);
		SetTextColor(hDC, gc->background);
		SetBkColor(hDC, gc->foreground);
		BitBlt(hDC, destX, destY, destWidth, destHeight, memDC, 
		       srcX, srcY, SRCINVERT);
		SetTextColor(hDC, RGB(255,255,255));
		SetBkColor(hDC, RGB(0,0,0));
		BitBlt(hDC, destX, destY, destWidth, destHeight, maskDC, 
		       srcX, srcY, SRCAND);
		SetTextColor(hDC, gc->background);
		SetBkColor(hDC, gc->foreground);
		BitBlt(hDC, destX, destY, destWidth, destHeight, memDC, 
		       srcX, srcY, SRCINVERT);
	    } else if (gc->fill_style == FillOpaqueStippled) { /* Opaque. */
		SetBkColor(hDC, gc->foreground);
		SetTextColor(hDC, gc->background);
	        BitBlt(hDC, destX, destY, destWidth, destHeight, memDC, 
			srcX, srcY, SRCCOPY);
	    }
	}
    }
    SelectBitmap(memDC, oldBitmap);
    if (maskDC != memDC) {
	TkWinReleaseDrawableDC(mask, maskDC, &maskState);
    }
    DeleteDC(memDC);
}

/*
 *----------------------------------------------------------------------
 *
 * Blt_EmulateXFillPolygon --
 *
 *	This differs from Tk's XFillPolygon in that it works around
 *	deficencies in Windows 95/98: 
 *		1. Stippling bitmap is limited to 8x8.
 *		2. No tiling (with or without mask).
 * Results:
 *	None.
 *
 *---------------------------------------------------------------------- 
 */
void
Blt_EmulateXFillPolygon(
    Display *display, 
    Drawable drawable, 
    GC gc,
    XPoint *pointPtr, 
    int nPoints, 
    int shape, 
    int mode) 
{
    HDC hDC;
    HRGN hRgn;
    POINT *p, *winPts, *endPtr;
    Region2D bbox;
    TkWinDCState state;
    int fillMode;

    if (drawable == None) {
	return;
    }

    /* Determine the bounding box of the polygon. */
    bbox.left = bbox.right = pointPtr->x;
    bbox.top = bbox.bottom = pointPtr->y;
    
    hDC = TkWinGetDrawableDC(display, drawable, &state);

    /* Allocate array of POINTS to create the polygon's path. */
    winPts = Blt_Malloc(sizeof(POINT) * nPoints);
    endPtr = winPts + nPoints;
    for (p = winPts; p < endPtr; p++) {
	if (pointPtr->x < bbox.left) {
	    bbox.left = pointPtr->x;
	} 
	if (pointPtr->x > bbox.right) {
	    bbox.right = pointPtr->x;
	}
	if (pointPtr->y < bbox.top) {
	    bbox.top = pointPtr->y;
	} 
	if (pointPtr->y > bbox.bottom) {
	    bbox.bottom = pointPtr->y;
	}
	p->x = pointPtr->x;
	p->y = pointPtr->y;
	pointPtr++;
    }

    SetROP2(hDC, tkpWinRopModes[gc->function]);
    fillMode = (gc->fill_rule == EvenOddRule) ? ALTERNATE : WINDING;

    if ((gc->fill_style == FillStippled) || 
	(gc->fill_style == FillOpaqueStippled)) {
	int width, height;

	/* Points are offsets within the bounding box. */
	for (p = winPts; p < endPtr; p++) {
	    p->x -= bbox.left;
	    p->y -= bbox.top;
	}
	/* Use the polygon as a clip path. */
	LPtoDP(hDC, winPts, nPoints);
	hRgn = CreatePolygonRgn(winPts, nPoints, fillMode);
	SelectClipRgn(hDC, hRgn);
	OffsetClipRgn(hDC, bbox.left, bbox.top);
	
	/* Tile the bounding box. */
	width = bbox.right - bbox.left + 1;
	height = bbox.bottom - bbox.top + 1;
	StippleRegion(display, hDC, gc, bbox.left, bbox.top, width, height);
	
	SelectClipRgn(hDC, NULL);
	DeleteRgn(hRgn);
    } else {
	HPEN oldPen;
	HBRUSH oldBrush;

	/* 
	 * FIXME: Right now, we're assuming that it's solid or
	 * stippled and ignoring tiling. I'll merge the bits from
	 * Blt_TilePolygon later. 
	 */
	oldPen = SelectPen(hDC, GetStockObject(NULL_PEN));
	oldBrush = SelectBrush(hDC, CreateSolidBrush(gc->foreground));
	SetPolyFillMode(hDC, fillMode);
	Polygon(hDC, winPts, nPoints);
	SelectPen(hDC, oldPen);
	DeleteBrush(SelectBrush(hDC, oldBrush));
    }
    Blt_Free(winPts);
    TkWinReleaseDrawableDC(drawable, hDC, &state);
}