/*
 * GDI functions
 *
 * Copyright 1993 Alexandre Julliard
 */

static char Copyright[] = "Copyright  Alexandre Julliard, 1993";

#include "gdi.h"


MDESC *GDI_Heap = NULL;


/***********************************************************************
 *          GDI stock objects 
 */

static BRUSHOBJ WhiteBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },          /* header */
    { BS_SOLID, RGB(255,255,255), 0 }  /* logbrush */
};

static BRUSHOBJ LtGrayBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },          /* header */
    { BS_SOLID, RGB(192,192,192), 0 }  /* logbrush */
};

static BRUSHOBJ GrayBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },          /* header */
    { BS_SOLID, RGB(128,128,128), 0 }  /* logbrush */
};

static BRUSHOBJ DkGrayBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },       /* header */
    { BS_SOLID, RGB(64,64,64), 0 }  /* logbrush */
};

static BRUSHOBJ BlackBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },    /* header */
    { BS_SOLID, RGB(0,0,0), 0 }  /* logbrush */
};

static BRUSHOBJ NullBrush =
{
    { 0, BRUSH_MAGIC, 1, 0 },  /* header */
    { BS_NULL, 0, 0 }          /* logbrush */
};

static PENOBJ WhitePen =
{
    { 0, PEN_MAGIC, 1, 0 },                  /* header */
    { PS_SOLID, { 1, 0 }, RGB(255,255,255) } /* logpen */
};

static PENOBJ BlackPen =
{
    { 0, PEN_MAGIC, 1, 0 },            /* header */
    { PS_SOLID, { 1, 0 }, RGB(0,0,0) } /* logpen */
};

static PENOBJ NullPen =
{
    { 0, PEN_MAGIC, 1, 0 },   /* header */
    { PS_NULL, { 1, 0 }, 0 }  /* logpen */
};

static FONTOBJ OEMFixedFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, OEM_CHARSET,
      0, 0, DEFAULT_QUALITY, FIXED_PITCH | FF_MODERN, "" }
};

static FONTOBJ AnsiFixedFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET,
      0, 0, DEFAULT_QUALITY, FIXED_PITCH | FF_MODERN, "" }
};

static FONTOBJ AnsiVarFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET,
      0, 0, DEFAULT_QUALITY, VARIABLE_PITCH | FF_SWISS, "" }
};

static FONTOBJ SystemFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET,
      0, 0, DEFAULT_QUALITY, VARIABLE_PITCH | FF_SWISS, "" }
};

static FONTOBJ DeviceDefaultFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET,
      0, 0, DEFAULT_QUALITY, VARIABLE_PITCH | FF_SWISS, "" }
};

static FONTOBJ SystemFixedFont =
{
    { 0, FONT_MAGIC, 1, 0 },   /* header */
    { 12, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET,
      0, 0, DEFAULT_QUALITY, FIXED_PITCH | FF_MODERN, "" }
};


static GDIOBJHDR * StockObjects[NB_STOCK_OBJECTS] =
{
    (GDIOBJHDR *) &WhiteBrush,
    (GDIOBJHDR *) &LtGrayBrush,
    (GDIOBJHDR *) &GrayBrush,
    (GDIOBJHDR *) &DkGrayBrush,
    (GDIOBJHDR *) &BlackBrush,
    (GDIOBJHDR *) &NullBrush,
    (GDIOBJHDR *) &WhitePen,
    (GDIOBJHDR *) &BlackPen,
    (GDIOBJHDR *) &NullPen,
    NULL,
    (GDIOBJHDR *) &OEMFixedFont,
    (GDIOBJHDR *) &AnsiFixedFont,
    (GDIOBJHDR *) &AnsiVarFont,
    (GDIOBJHDR *) &SystemFont,
    (GDIOBJHDR *) &DeviceDefaultFont,
    NULL,            /* DEFAULT_PALETTE created by PALETTE_Init */
    (GDIOBJHDR *) &SystemFixedFont
};

extern GDIOBJHDR * PALETTE_systemPalette;


/***********************************************************************
 *           GDI_Init
 *
 * GDI initialisation.
 */
BOOL GDI_Init()
{
    struct segment_descriptor_s * s;

      /* Create GDI heap */

    s = (struct segment_descriptor_s *)GetNextSegment( 0, 0x10000 );
    if (s == NULL) return FALSE;
    HEAP_Init( &GDI_Heap, s->base_addr, GDI_HEAP_SIZE );

      /* Create default palette */

    COLOR_Init();
    PALETTE_Init();
    StockObjects[DEFAULT_PALETTE] = PALETTE_systemPalette;

      /* Create default bitmap */

    if (!BITMAP_Init()) return FALSE;

      /* Initialise regions */

    if (!REGION_Init()) return FALSE;
    
    return TRUE;
}


/***********************************************************************
 *           GDI_FindPrevObject
 *
 * Return the GDI object whose hNext field points to obj.
 */
HANDLE GDI_FindPrevObject( HANDLE first, HANDLE obj )
{
    HANDLE handle;
        
    for (handle = first; handle && (handle != obj); )
    {
	GDIOBJHDR * header = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
	handle = header->hNext;
    }
    return handle;
}


/***********************************************************************
 *           GDI_AllocObject
 */
HANDLE GDI_AllocObject( WORD size, WORD magic )
{
    static DWORD count = 0;
    GDIOBJHDR * obj;
    HANDLE handle = GDI_HEAP_ALLOC( GMEM_MOVEABLE, size );
    if (!handle) return 0;
    obj = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
    if (obj == NULL) {
    	printf("GDI_AllocObject // Error trying to get GDI_HEAD_ADDR !\n");
    	return 0;
    	}
    obj->hNext   = 0;
    obj->wMagic  = magic;
    obj->dwCount = ++count;
    return handle;
}


/***********************************************************************
 *           GDI_FreeObject
 */
BOOL GDI_FreeObject( HANDLE handle )
{
    GDIOBJHDR * object;
    HANDLE prev;

      /* Can't free stock objects */
    if (handle >= FIRST_STOCK_HANDLE) return FALSE;
    
    object = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
    if (!object) return FALSE;

      /* Free object */
    
    GDI_HEAP_FREE( handle );
    return TRUE;
}

/***********************************************************************
 *           GDI_GetObjPtr
 *
 * Return a pointer to the GDI object associated to the handle.
 * Return NULL if the object has the wrong magic number.
 */
GDIOBJHDR * GDI_GetObjPtr( HANDLE handle, WORD magic )
{
    GDIOBJHDR * ptr = NULL;

    if (handle >= FIRST_STOCK_HANDLE)
    {
	if (handle < FIRST_STOCK_HANDLE + NB_STOCK_OBJECTS)
	    ptr = StockObjects[handle - FIRST_STOCK_HANDLE];
    }
    else ptr = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
    if (!ptr) return NULL;
    if (ptr->wMagic != magic) return NULL;
    return ptr;
}


/***********************************************************************
 *           DeleteObject    (GDI.69)
 */
BOOL DeleteObject( HANDLE obj )
{
      /* Check if object is valid */

    GDIOBJHDR * header = (GDIOBJHDR *) GDI_HEAP_ADDR( obj );
    if (!header) return FALSE;

#ifdef DEBUG_GDI
    printf( "DeleteObject: %d\n", obj );
#endif

      /* Delete object */

    switch(header->wMagic)
    {
      case PEN_MAGIC:     return GDI_FreeObject( obj );
      case BRUSH_MAGIC:   return BRUSH_DeleteObject( obj, header );
      case FONT_MAGIC:    return GDI_FreeObject( obj );
      case PALETTE_MAGIC: return GDI_FreeObject( obj );
      case BITMAP_MAGIC:  return BMP_DeleteObject( obj, header );
      case REGION_MAGIC:  return REGION_DeleteObject( obj, header );
    }
    return FALSE;
}


/***********************************************************************
 *           GetStockObject    (GDI.87)
 */
HANDLE GetStockObject( int obj )
{
    if ((obj < 0) || (obj >= NB_STOCK_OBJECTS)) return 0;
    if (!StockObjects[obj]) return 0;
#ifdef DEBUG_GDI
    printf( "GetStockObject: returning %04x\n", FIRST_STOCK_HANDLE + obj );
#endif
    return FIRST_STOCK_HANDLE + obj;
}


/***********************************************************************
 *           GetObject    (GDI.82)
 */
int GetObject( HANDLE handle, int count, LPSTR buffer )
{
    GDIOBJHDR * ptr = NULL;
#ifdef DEBUG_GDI
    printf( "GetObject: %04x %d %08x\n", handle, count, buffer );
#endif
    if (!count) return 0;

    if (handle >= FIRST_STOCK_HANDLE)
    {
	if (handle < FIRST_STOCK_HANDLE + NB_STOCK_OBJECTS)
	    ptr = StockObjects[handle - FIRST_STOCK_HANDLE];
    }
    else ptr = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
    if (!ptr) return 0;
    
    switch(ptr->wMagic)
    {
      case PEN_MAGIC:
	  return PEN_GetObject( (PENOBJ *)ptr, count, buffer );
      case BRUSH_MAGIC: 
	  return BRUSH_GetObject( (BRUSHOBJ *)ptr, count, buffer );
      case BITMAP_MAGIC: 
	  return BMP_GetObject( (BITMAPOBJ *)ptr, count, buffer );
      case FONT_MAGIC:
	  return FONT_GetObject( (FONTOBJ *)ptr, count, buffer );
      case PALETTE_MAGIC:
	  return PALETTE_GetObject( (PALETTEOBJ *)ptr, count, buffer );
    }
    return 0;
}


/***********************************************************************
 *           SelectObject    (GDI.45)
 */
HANDLE SelectObject( HDC hdc, HANDLE handle )
{
    GDIOBJHDR * ptr = NULL;
    DC * dc;
    
#ifdef DEBUG_GDI
    printf( "SelectObject: %d %04x\n", hdc, handle );
#endif
    if (handle >= FIRST_STOCK_HANDLE)
    {
	if (handle < FIRST_STOCK_HANDLE + NB_STOCK_OBJECTS)
	    ptr = StockObjects[handle - FIRST_STOCK_HANDLE];
    }
    else ptr = (GDIOBJHDR *) GDI_HEAP_ADDR( handle );
    if (!ptr) return 0;
    
    dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
    if (!dc) return 0;
    
    switch(ptr->wMagic)
    {
      case PEN_MAGIC:
	  return PEN_SelectObject( dc, handle, (PENOBJ *)ptr );
      case BRUSH_MAGIC:
	  return BRUSH_SelectObject( hdc, dc, handle, (BRUSHOBJ *)ptr );
      case BITMAP_MAGIC:
	  return BITMAP_SelectObject( hdc, dc, handle, (BITMAPOBJ *)ptr );
      case FONT_MAGIC:
	  return FONT_SelectObject( dc, handle, (FONTOBJ *)ptr );	  
      case REGION_MAGIC:
	  return SelectClipRgn( hdc, handle );
    }
    return 0;
}


/***********************************************************************
 *           UnrealizeObject    (GDI.150)
 */
BOOL UnrealizeObject( HANDLE handle )
{
#ifdef DEBUG_GDI
    printf( "UnrealizeObject: %04x\n", handle );
#endif
    return TRUE;
}