#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>

#include "gc.h"

static void *g_pDefaultFunction[gcMaxMethod] = {
	GCDrawPixelDirect,
	GCGetWidth,
	GCGetHeight,
	GCConvColorToBytes,
	GCConvBytesToColor,
	GCSetClipRect,
	GCOnOpen,
	GCOnClose,
	GCDrawBegin,
	GCDrawEnd,
	GCSetFGColor,
	GCGetFGColor,
	GCSetBGColor,
	GCGetBGColor,
	GCDrawPointCoord,
	GCDrawLineCoord,
	GCDrawRectCoord,
	GCFillRectCoord,
};

static tGC *first = NULL;

tGC *AllocGC(void)
{ 
	tGC *pGC = kmalloc(sizeof(tGC),GFP_KERNEL); 
	if( pGC ) {
		enum eGCMethod m;
		memset(pGC,0,sizeof(tGC));
		for( m=gcDrawPixelDirect ; m<gcMaxMethod ; m++ ) {
			RegisterGCMethod(pGC,m,g_pDefaultFunction[m]);
		}
	}
	return pGC;
}

void FreeGC(tGC *pGC) {
	kfree(pGC);
}

tGC *OpenGC( const char *name, void *param )
{
	tGC *act = first;
	while( act!=NULL && strcmp( name, act->pGDC->name ) )
		act = act->next;

	if( act!=NULL ) {
		tRect screen;
		act->OnOpen(act,param);
		GGetScreenRect(act,&screen);
		GSetClipRect(act,&screen);
	}

	return act;
}

void CloseGC(tGC *gc )
{
	gc->OnClose(gc);
}

tGC *RegisterDeviceGC( tGDC *pGDC )
{
	tGC *pGC = AllocGC();
	
	if( pGC ) {
		pGC->pGDC = pGDC;
		if( pGDC->OnRegister(pGC)==0 ) {
			if( first ) {
				pGC->next = first;
			}
			first = pGC;
			return pGC;
		}
	}

	return NULL;
}

int RegisterGCMethod( tGC *pGC, enum eGCMethod method, void *p )
{
	switch( method ) {
	case gcDrawPixelDirect  : pGC->DrawPixelDirect = p; break;
	case gcGetWidth         : pGC->GetWidth = p; break;
	case gcGetHeight        : pGC->GetHeight = p; break;
	case gcConvColorToBytes : pGC->ConvColorToBytes = p; break;
	case gcConvBytesToColor : pGC->ConvBytesToColor = p; break;
	case gcSetClipRect      : pGC->SetClipRect = p; break;
	case gcOnOpen           : pGC->OnOpen = p; break;
	case gcOnClose          : pGC->OnClose = p; break;
	case gcDrawBegin        : pGC->DrawBegin = p; break;
	case gcDrawEnd          : pGC->DrawEnd = p; break;
	case gcSetFGColor       : pGC->SetFGColor = p; break;
	case gcGetFGColor       : pGC->GetFGColor = p; break;
	case gcSetBGColor       : pGC->SetBGColor = p; break;
	case gcGetBGColor       : pGC->GetBGColor = p; break;
	case gcDrawPointCoord   : pGC->DrawPointCoord = p; break;
	case gcDrawLineCoord    : pGC->DrawLineCoord = p; break;
	case gcDrawRectCoord    : pGC->DrawRectCoord = p; break;
	case gcFillRectCoord    : pGC->FillRectCoord = p; break;
	default: 
		//assert(0); 
		return -1;
	}
	return 0;
}