/**
 ** fillpatt.c ---- draw a pattern filled horizontal line
 **
 ** Copyright (C) 1997, Michael Goffioul
 ** [e-mail : goffioul@emic.ucl.ac.be]
 **
 ** This file is part of the GRX graphics library.
 **
 ** The GRX graphics library is free software; you can redistribute it
 ** and/or modify it under some conditions; see the "copying.grx" file
 ** for details.
 **
 ** This library is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 **
 ** Contributions by: (See "doc/credits.doc" for details)
 ** Hartmut Schirmer (hsc@techfak.uni-kiel.de)
 **
 **/

#include "libgrx.h"
#include "arith.h"
#include "shapes.h"

void _GrFillPatternExt(int x, int y, int sx, int sy, int width, GrPattern *p)
{
    GRX_ENTER();
    if (p->gp_ptype == GR_PTYPE_PIXMAP) {
        void (*bltfun)(GrFrame*,int,int,GrFrame*,int,int,int,int,GrColor);
        int pattwdt = p->gp_pxp_width;
        int xdest = x;
        int ydest = y;
        int ypatt = (y-sy) % p->gp_pxp_height;
        int xpatt = (x-sx) % pattwdt;
        GrColor optype = p->gp_pxp_oper;
        int cpysize;

        if (xpatt < 0) xpatt += pattwdt;
        if (ypatt < 0) ypatt += p->gp_pxp_height;
        cpysize = pattwdt - xpatt;

        if (CURC->gc_onscreen) bltfun = CURC->gc_driver->bltr2v;
        else                   bltfun = CURC->gc_driver->bitblt;
        while (width > 0) {
            if (cpysize > width) cpysize = width;
            (*bltfun)(
                &CURC->gc_frame,xdest,ydest,
                &p->gp_pxp_source,xpatt,ypatt,cpysize,1,
                optype
            );
            width -= cpysize;
            xpatt = 0;
            xdest += cpysize;
            cpysize = pattwdt;
        }
    }
    else if(p->gp_ptype == GR_PTYPE_BITMAP) {
        char bits = p->gp_bmp_data[y % p->gp_bmp_height];
        if (bits == 0)
            (*CURC->gc_driver->drawhline)(x,y,width,p->gp_bmp_bgcolor);
        else if ((GR_int8u)bits == 0xff)
            (*CURC->gc_driver->drawhline)(x,y,width,p->gp_bmp_fgcolor);
        else {
            GrColor fg = p->gp_bmp_fgcolor;
            GrColor bg = p->gp_bmp_bgcolor;
            int xoffs = x & 7;
            #if USE_FDR_DRAWPATTERN-0
            GR_int8u pp = replicate_b2w(bits) >> (8-xoffs);
            (*CURC->gc_driver->drawpattern)(x,y,width,pp,fg,bg);
            #else
            unsigned char mask = 0x80;
            mask >>= xoffs;
            width += x;
            do {
                (*CURC->gc_driver->drawpixel)(x,y,(bits & mask) ? fg : bg);
                if((mask >>= 1) == 0) mask = 0x80;
            } while(++x != width);
            #endif
        }
    }
    else if(p->gp_ptype == GR_PTYPE_GRADIENT) {
        GrColor pixels[width];
        int i;

        if (p->gp_grd_mode == GR_RADIAL_GRADIENT) {
            for (i=0; i<width; i++)
                pixels[i] = _GrRadGradientColor((GrGradient *)p, x+i, y, sx, sy);
        } else {
            for (i=0; i<width; i++)
                pixels[i] = _GrLinGradientColor((GrGradient *)p, x+i, y, sx, sy);
        }
        (*CURC->gc_driver->putscanline)(x, y, width, pixels, p->gp_grd_oper);
    }

    GRX_LEAVE();
}