/*
 * GDI brush objects
 *
 * Copyright 1993, 1994  Alexandre Julliard
 */

#include <stdlib.h>
#include "brush.h"
#include "bitmap.h"
#include "color.h"
#include "x11drv.h"
#include "stddebug.h"
#include "debug.h"

static const char HatchBrushes[NB_HATCH_STYLES][8] =
{
    { 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00 }, /* HS_HORIZONTAL */
    { 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08 }, /* HS_VERTICAL   */
    { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }, /* HS_FDIAGONAL  */
    { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }, /* HS_BDIAGONAL  */
    { 0x08, 0x08, 0x08, 0xff, 0x08, 0x08, 0x08, 0x08 }, /* HS_CROSS      */
    { 0x81, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x81 }  /* HS_DIAGCROSS  */
};

  /* Levels of each primary for dithering */
#define PRIMARY_LEVELS  3  
#define TOTAL_LEVELS    (PRIMARY_LEVELS*PRIMARY_LEVELS*PRIMARY_LEVELS)

 /* Dithering matrix size  */
#define MATRIX_SIZE     8
#define MATRIX_SIZE_2   (MATRIX_SIZE*MATRIX_SIZE)

  /* Total number of possible levels for a dithered primary color */
#define DITHER_LEVELS   (MATRIX_SIZE_2 * (PRIMARY_LEVELS-1) + 1)

  /* Dithering matrix */
static const int dither_matrix[MATRIX_SIZE_2] =
{
     0, 32,  8, 40,  2, 34, 10, 42,
    48, 16, 56, 24, 50, 18, 58, 26,
    12, 44,  4, 36, 14, 46,  6, 38,
    60, 28, 52, 20, 62, 30, 54, 22,
     3, 35, 11, 43,  1, 33,  9, 41,
    51, 19, 59, 27, 49, 17, 57, 25,
    15, 47,  7, 39, 13, 45,  5, 37,
    63, 31, 55, 23, 61, 29, 53, 21
};

  /* Mapping between (R,G,B) triples and EGA colors */
static const int EGAmapping[TOTAL_LEVELS] =
{
    0,  /* 000000 -> 000000 */
    4,  /* 00007f -> 000080 */
    12, /* 0000ff -> 0000ff */
    2,  /* 007f00 -> 008000 */
    6,  /* 007f7f -> 008080 */
    6,  /* 007fff -> 008080 */
    10, /* 00ff00 -> 00ff00 */
    6,  /* 00ff7f -> 008080 */
    14, /* 00ffff -> 00ffff */
    1,  /* 7f0000 -> 800000 */
    5,  /* 7f007f -> 800080 */
    5,  /* 7f00ff -> 800080 */
    3,  /* 7f7f00 -> 808000 */
    8,  /* 7f7f7f -> 808080 */
    7,  /* 7f7fff -> c0c0c0 */
    3,  /* 7fff00 -> 808000 */
    7,  /* 7fff7f -> c0c0c0 */
    7,  /* 7fffff -> c0c0c0 */
    9,  /* ff0000 -> ff0000 */
    5,  /* ff007f -> 800080 */
    13, /* ff00ff -> ff00ff */
    3,  /* ff7f00 -> 808000 */
    7,  /* ff7f7f -> c0c0c0 */
    7,  /* ff7fff -> c0c0c0 */
    11, /* ffff00 -> ffff00 */
    7,  /* ffff7f -> c0c0c0 */
    15  /* ffffff -> ffffff */
};

#define PIXEL_VALUE(r,g,b) \
    COLOR_mapEGAPixel[EGAmapping[((r)*PRIMARY_LEVELS+(g))*PRIMARY_LEVELS+(b)]]

  /* X image for building dithered pixmap */
static XImage *ditherImage = NULL;


/***********************************************************************
 *           BRUSH_Init
 *
 * Create the X image used for dithering.
 */
BOOL32 X11DRV_BRUSH_Init(void)
{
    XCREATEIMAGE( ditherImage, MATRIX_SIZE, MATRIX_SIZE, screenDepth );
    return (ditherImage != NULL);
}


/***********************************************************************
 *           BRUSH_DitherColor
 */
static Pixmap BRUSH_DitherColor( DC *dc, COLORREF color )
{
    static COLORREF prevColor = 0xffffffff;
    unsigned int x, y;
    Pixmap pixmap;

    if (color != prevColor)
    {
	int r = GetRValue( color ) * DITHER_LEVELS;
	int g = GetGValue( color ) * DITHER_LEVELS;
	int b = GetBValue( color ) * DITHER_LEVELS;
	const int *pmatrix = dither_matrix;

	for (y = 0; y < MATRIX_SIZE; y++)
	{
	    for (x = 0; x < MATRIX_SIZE; x++)
	    {
		int d  = *pmatrix++ * 256;
		int dr = ((r + d) / MATRIX_SIZE_2) / 256;
		int dg = ((g + d) / MATRIX_SIZE_2) / 256;
		int db = ((b + d) / MATRIX_SIZE_2) / 256;
		XPutPixel( ditherImage, x, y, PIXEL_VALUE(dr,dg,db) );
	    }
	}
	prevColor = color;
    }
    
    pixmap = XCreatePixmap( display, rootWindow,
			    MATRIX_SIZE, MATRIX_SIZE, screenDepth );
    XPutImage( display, pixmap, BITMAP_colorGC, ditherImage, 0, 0,
	       0, 0, MATRIX_SIZE, MATRIX_SIZE );
    return pixmap;
}


/***********************************************************************
 *           BRUSH_SelectSolidBrush
 */
static void BRUSH_SelectSolidBrush( DC *dc, COLORREF color )
{
    if ((dc->w.bitsPerPixel > 1) && (screenDepth <= 8) && !COLOR_IsSolid( color ))
    {
	  /* Dithered brush */
	dc->u.x.brush.pixmap = BRUSH_DitherColor( dc, color );
	dc->u.x.brush.fillStyle = FillTiled;
	dc->u.x.brush.pixel = 0;
    }
    else
    {
	  /* Solid brush */
	dc->u.x.brush.pixel = COLOR_ToPhysical( dc, color );
	dc->u.x.brush.fillStyle = FillSolid;
    }
}


/***********************************************************************
 *           BRUSH_SelectPatternBrush
 */
static BOOL32 BRUSH_SelectPatternBrush( DC * dc, HBITMAP32 hbitmap )
{
    BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
    if (!bmp) return FALSE;
    dc->u.x.brush.pixmap = XCreatePixmap( display, rootWindow,
					  8, 8, bmp->bitmap.bmBitsPixel );
    XCopyArea( display, bmp->pixmap, dc->u.x.brush.pixmap,
	       BITMAP_GC(bmp), 0, 0, 8, 8, 0, 0 );
    
    if (bmp->bitmap.bmBitsPixel > 1)
    {
	dc->u.x.brush.fillStyle = FillTiled;
	dc->u.x.brush.pixel = 0;  /* Ignored */
    }
    else
    {
	dc->u.x.brush.fillStyle = FillOpaqueStippled;
	dc->u.x.brush.pixel = -1;  /* Special case (see DC_SetupGCForBrush) */
    }
    return TRUE;
}


/***********************************************************************
 *           BRUSH_SelectObject
 */
HBRUSH32 X11DRV_BRUSH_SelectObject( DC * dc, HBRUSH32 hbrush, BRUSHOBJ * brush )
{
    HBITMAP16 hBitmap;
    BITMAPINFO * bmpInfo;
    HBRUSH16 prevHandle = dc->w.hBrush;

    dprintf_gdi(stddeb, "Brush_SelectObject: hdc=%04x hbrush=%04x\n",
                dc->hSelf,hbrush);
#ifdef NOTDEF
    if (dc->header.wMagic == METAFILE_DC_MAGIC)
    {
        LOGBRUSH16 logbrush = { brush->logbrush.lbStyle,
                                brush->logbrush.lbColor,
                                brush->logbrush.lbHatch };
	switch (brush->logbrush.lbStyle)
	{
	case BS_SOLID:
	case BS_HATCHED:
	case BS_HOLLOW:
	    if (!MF_CreateBrushIndirect( dc, hbrush, &logbrush )) return 0;
	    break;
	case BS_PATTERN:
	case BS_DIBPATTERN:
	    if (!MF_CreatePatternBrush( dc, hbrush, &logbrush )) return 0;
	    break;
	}
	return 1;  /* FIXME? */
    }
#endif    
    dc->w.hBrush = hbrush;

    if (dc->u.x.brush.pixmap)
    {
	XFreePixmap( display, dc->u.x.brush.pixmap );
	dc->u.x.brush.pixmap = 0;
    }
    dc->u.x.brush.style = brush->logbrush.lbStyle;
    
    switch(brush->logbrush.lbStyle)
    {
      case BS_NULL:
	dprintf_gdi( stddeb,"BS_NULL\n" );
	break;

      case BS_SOLID:
        dprintf_gdi( stddeb,"BS_SOLID\n" );
	BRUSH_SelectSolidBrush( dc, brush->logbrush.lbColor );
	break;
	
      case BS_HATCHED:
	dprintf_gdi( stddeb, "BS_HATCHED\n" );
	dc->u.x.brush.pixel = COLOR_ToPhysical( dc, brush->logbrush.lbColor );
	dc->u.x.brush.pixmap = XCreateBitmapFromData( display, rootWindow,
				 HatchBrushes[brush->logbrush.lbHatch], 8, 8 );
	dc->u.x.brush.fillStyle = FillStippled;
	break;
	
      case BS_PATTERN:
	dprintf_gdi( stddeb, "BS_PATTERN\n");
	BRUSH_SelectPatternBrush( dc, (HBRUSH16)brush->logbrush.lbHatch );
	break;

      case BS_DIBPATTERN:
	dprintf_gdi( stddeb, "BS_DIBPATTERN\n");
	if ((bmpInfo = (BITMAPINFO *) GlobalLock16( (HGLOBAL16)brush->logbrush.lbHatch )))
	{
	    int size = DIB_BitmapInfoSize( bmpInfo, brush->logbrush.lbColor );
	    hBitmap = CreateDIBitmap32( dc->hSelf, &bmpInfo->bmiHeader,
                                        CBM_INIT, ((char *)bmpInfo) + size,
                                        bmpInfo,
                                        (WORD)brush->logbrush.lbColor );
	    BRUSH_SelectPatternBrush( dc, hBitmap );
	    DeleteObject16( hBitmap );
	    GlobalUnlock16( (HGLOBAL16)brush->logbrush.lbHatch );	    
	}
	
	break;
    }
    
    return prevHandle;
}