/*
 * X11 graphics driver text functions
 *
 * Copyright 1993,1994 Alexandre Julliard
 */

#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include "windows.h"
#include "dc.h"
#include "gdi.h"
/*#include "callback.h"*/
#include "heap.h"
#include "x11font.h"
#include "stddebug.h"
/* #define DEBUG_TEXT */
#include "debug.h"

#define SWAP_INT(a,b)  { int t = a; a = b; b = t; }


/***********************************************************************
 *           X11DRV_ExtTextOut
 */
BOOL32
X11DRV_ExtTextOut( DC *dc, INT32 x, INT32 y, UINT32 flags,
                   const RECT32 *lprect, LPCSTR str, UINT32 count,
                   const INT32 *lpDx )
{
    HRGN32		hRgnClip = 0;
    int 		dir, ascent, descent, i;
    fontObject*		pfo;
    XCharStruct 	info;
    XFontStruct*	font;
    RECT32 		rect;
    char		dfBreakChar, lfUnderline, lfStrikeOut;

    if (!DC_SetupGCForText( dc )) return TRUE;

    pfo = XFONT_GetFontObject( dc->u.x.font );
    font = pfo->fs;

    dfBreakChar = (char)pfo->fi->df.dfBreakChar;
    lfUnderline = (pfo->fo_flags & FO_SYNTH_UNDERLINE) ? 1 : 0;
    lfStrikeOut = (pfo->fo_flags & FO_SYNTH_STRIKEOUT) ? 1 : 0;

    dprintf_text(stddeb,"ExtTextOut: hdc=%04x df=%04x %d,%d '%.*s', %d  flags=%d\n",
                 dc->hSelf, (UINT16)(dc->u.x.font), x, y, (int)count, str, count, flags);

    if (lprect != NULL) dprintf_text(stddeb, "\trect=(%d,%d- %d,%d)\n",
                                     lprect->left, lprect->top,
                                     lprect->right, lprect->bottom );
      /* Setup coordinates */

    if (dc->w.textAlign & TA_UPDATECP)
    {
	x = dc->w.CursPosX;
	y = dc->w.CursPosY;
    }

    if (flags & (ETO_OPAQUE | ETO_CLIPPED))  /* there's a rectangle */
    {
        if (!lprect)  /* not always */
        {
            SIZE32 sz;
            if (flags & ETO_CLIPPED)  /* Can't clip with no rectangle */
	      return FALSE;
	    if (!X11DRV_GetTextExtentPoint( dc, str, count, &sz ))
	      return FALSE;
	    rect.left   = XLPTODP( dc, x );
	    rect.right  = XLPTODP( dc, x+sz.cx );
	    rect.top    = YLPTODP( dc, y );
	    rect.bottom = YLPTODP( dc, y+sz.cy );
	}
	else
	{
	    rect.left   = XLPTODP( dc, lprect->left );
	    rect.right  = XLPTODP( dc, lprect->right );
	    rect.top    = YLPTODP( dc, lprect->top );
	    rect.bottom = YLPTODP( dc, lprect->bottom );
	}
	if (rect.right < rect.left) SWAP_INT( rect.left, rect.right );
	if (rect.bottom < rect.top) SWAP_INT( rect.top, rect.bottom );
    }

    x = XLPTODP( dc, x );
    y = YLPTODP( dc, y );

    dprintf_text(stddeb,"\treal coord: x=%i, y=%i, rect=(%d,%d-%d,%d)\n",
			  x, y, rect.left, rect.top, rect.right, rect.bottom);

      /* Draw the rectangle */

    if (flags & ETO_OPAQUE)
    {
        XSetForeground( display, dc->u.x.gc, dc->w.backgroundPixel );
        XFillRectangle( display, dc->u.x.drawable, dc->u.x.gc,
                        dc->w.DCOrgX + rect.left, dc->w.DCOrgY + rect.top,
                        rect.right-rect.left, rect.bottom-rect.top );
    }
    if (!count) return TRUE;  /* Nothing more to do */

      /* Compute text starting position */

    if (lpDx) /* have explicit character cell x offsets in logical coordinates */
    {
	int extra = dc->wndExtX / 2;
        for (i = info.width = 0; i < count; i++) info.width += lpDx[i];
	info.width = (info.width * dc->vportExtX + extra ) / dc->wndExtX;
    }
    else
    {
	XTextExtents( font, str, count, &dir, &ascent, &descent, &info );
        info.width += count*dc->w.charExtra + dc->w.breakExtra*dc->w.breakCount;
    }

    switch( dc->w.textAlign & (TA_LEFT | TA_RIGHT | TA_CENTER) )
    {
      case TA_LEFT:
 	  if (dc->w.textAlign & TA_UPDATECP)
	      dc->w.CursPosX = XDPTOLP( dc, x + info.width );
	  break;
      case TA_RIGHT:
	  x -= info.width;
	  if (dc->w.textAlign & TA_UPDATECP) dc->w.CursPosX = XDPTOLP( dc, x );
	  break;
      case TA_CENTER:
	  x -= info.width / 2;
	  break;
    }

    switch( dc->w.textAlign & (TA_TOP | TA_BOTTOM | TA_BASELINE) )
    {
      case TA_TOP:
	  y += font->ascent;
	  break;
      case TA_BOTTOM:
	  y -= font->descent;
	  break;
      case TA_BASELINE:
	  break;
    }

      /* Set the clip region */

    if (flags & ETO_CLIPPED)
    {
        hRgnClip = dc->w.hClipRgn;
        CLIPPING_IntersectClipRect( dc, rect.left, rect.top, rect.right,
                                    rect.bottom, CLIP_INTERSECT|CLIP_KEEPRGN );
    }

      /* Draw the text background if necessary */

    if (dc->w.backgroundMode != TRANSPARENT)
    {
          /* If rectangle is opaque and clipped, do nothing */
        if (!(flags & ETO_CLIPPED) || !(flags & ETO_OPAQUE))
        {
              /* Only draw if rectangle is not opaque or if some */
              /* text is outside the rectangle */
            if (!(flags & ETO_OPAQUE) ||
                (x < rect.left) ||
                (x + info.width >= rect.right) ||
                (y-font->ascent < rect.top) ||
                (y+font->descent >= rect.bottom))
            {
                XSetForeground( display, dc->u.x.gc, dc->w.backgroundPixel );
                XFillRectangle( display, dc->u.x.drawable, dc->u.x.gc,
                                dc->w.DCOrgX + x,
                                dc->w.DCOrgY + y - font->ascent,
                                info.width,
                                font->ascent + font->descent );
            }
        }
    }
    
    /* Draw the text (count > 0 verified) */

    XSetForeground( display, dc->u.x.gc, dc->w.textPixel );
    if (!dc->w.charExtra && !dc->w.breakExtra && !lpDx)
    {
        XDrawString( display, dc->u.x.drawable, dc->u.x.gc, 
                     dc->w.DCOrgX + x, dc->w.DCOrgY + y, str, count );
    }
    else  /* Now the fun begins... */
    {
        XTextItem *items, *pitem;
	int delta;

	/* allocate max items */

        pitem = items = HEAP_xalloc( GetProcessHeap(), 0,
                                     count * sizeof(XTextItem) );
        delta = i = 0;
	if( lpDx ) /* explicit character widths */
	{
	    int extra = dc->wndExtX / 2;

	    while (i < count)
	    {
		/* initialize text item with accumulated delta */

		pitem->chars  = (char *)str + i;
		pitem->delta  = delta;
		pitem->nchars = 0;
		pitem->font   = None;
		delta = 0;

		/* add characters  to the same XTextItem until new delta
		 * becomes  non-zero */

		do
		{
		    delta += (lpDx[i] * dc->vportExtX + extra) / dc->wndExtX
					    - XTextWidth( font, str + i, 1);
		    pitem->nchars++;
		} while ((++i < count) && !delta);
		pitem++;
	   }
	}
	else /* charExtra or breakExtra */
	{
            while (i < count)
            {
		pitem->chars  = (char *)str + i;
		pitem->delta  = delta;
		pitem->nchars = 0;
		pitem->font   = None;
		delta = 0;

		do
                {
                    delta += dc->w.charExtra;
                    if (str[i] == (char)dfBreakChar) delta += dc->w.breakExtra;
		    pitem->nchars++;
                } while ((++i < count) && !delta);
		pitem++;
            } 
        }

        XDrawText( display, dc->u.x.drawable, dc->u.x.gc,
                   dc->w.DCOrgX + x, dc->w.DCOrgY + y, items, pitem - items );
        HeapFree( GetProcessHeap(), 0, items );
    }

      /* Draw underline and strike-out if needed */

    if (lfUnderline)
    {
	long linePos, lineWidth;       

	if (!XGetFontProperty( font, XA_UNDERLINE_POSITION, &linePos ))
	    linePos = font->descent-1;
	if (!XGetFontProperty( font, XA_UNDERLINE_THICKNESS, &lineWidth ))
	    lineWidth = 0;
	else if (lineWidth == 1) lineWidth = 0;
	XSetLineAttributes( display, dc->u.x.gc, lineWidth,
			    LineSolid, CapRound, JoinBevel ); 
        XDrawLine( display, dc->u.x.drawable, dc->u.x.gc,
		   dc->w.DCOrgX + x, dc->w.DCOrgY + y + linePos,
		   dc->w.DCOrgX + x + info.width, dc->w.DCOrgY + y + linePos );
    }
    if (lfStrikeOut)
    {
	long lineAscent, lineDescent;
	if (!XGetFontProperty( font, XA_STRIKEOUT_ASCENT, &lineAscent ))
	    lineAscent = font->ascent / 2;
	if (!XGetFontProperty( font, XA_STRIKEOUT_DESCENT, &lineDescent ))
	    lineDescent = -lineAscent * 2 / 3;
	XSetLineAttributes( display, dc->u.x.gc, lineAscent + lineDescent,
			    LineSolid, CapRound, JoinBevel ); 
	XDrawLine( display, dc->u.x.drawable, dc->u.x.gc,
		   dc->w.DCOrgX + x, dc->w.DCOrgY + y - lineAscent,
		   dc->w.DCOrgX + x + info.width, dc->w.DCOrgY + y - lineAscent );
    }

    if (flags & ETO_CLIPPED) 
    {
      SelectClipRgn32( dc->hSelf, hRgnClip );
      DeleteObject32( hRgnClip );
    }
    return TRUE;
}