fb.c

在ｅｃｏｓ 下mingui 的移植开发

/*
 * Copyright (c) 2000 Greg Haerr <[e-mail]>
 * Screen Driver Utilities
 * Microwindows framebuffer selection routines
 * Including this file will drag in all fblinX framebuffer subdrivers
 * When a new framebuffer subdriver is written, it should be referenced
 * here in select_fb_driver.
 *
 * 2000/10/20 Modified by Song Lixin  to be used under MiniGUI.
 */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "native.h"
#include "../../ial/native/native.h"
#include "fb.h"
#ifndef __ECOS
# include <syslog.h>
#endif

/* select a framebuffer subdriver based on planes and bpp*/
/* modify this procedure to add a new framebuffer subdriver*/
extern SUBDRIVER fblinear1;
extern SUBDRIVER fblinear2;
extern SUBDRIVER fblinear4;
extern SUBDRIVER fblinear8;
extern SUBDRIVER fblinear16;
extern SUBDRIVER fblinear24;
extern SUBDRIVER fblinear32;
#ifndef __ECOS
extern SUBDRIVER fbvga16;
#endif

PSUBDRIVER select_fb_subdriver(PSD psd)
{
	PSUBDRIVER  driver = NULL;

	/* FB_TYPE_VGA_PLANES*/
	/* device and memory drivers are not same for vga16*/
	if(psd->planes == 4 && psd->bpp == 4) {
#ifndef __ECOS
		driver = &fbvga16;
#endif
    }
	/* FB_TYPE_PACKED_PIXELS*/
	/* device and memory drivers are the same for packed pixels*/
	else if(psd->planes == 1) {
		switch(psd->bpp) {
		case 1:
	//		driver = &fblinear1;
		break;
		case 2:
//			driver = &fblinear2;
		break;
		case 4:
//			driver = &fblinear4;
		break;
		case 8:
			driver = &fblinear8;
		break;
		case 16:
//			driver = &fblinear16;
		break;
		case 24:
//			driver = &fblinear24;
		break;
		case 32:
//			driver = &fblinear32;
		break;
		}
	}
	/* return driver selected*/
	return driver;
}

/* 
 * Initialize memory device with passed parms,
 * select suitable framebuffer subdriver,
 * and set subdriver in memory device.
 */
int fb_mapmemgc(PSD mempsd,int w,int h,int planes,int bpp, int linelen,int size,void *addr)
{
	PSUBDRIVER subdriver;

	/* initialize mem screen driver*/

	assert ( w > 0 );
	assert ( h > 0 );
	assert ( planes > 0 );
	assert ( linelen > 0 );
	assert ( size > 0 );
	assert ( addr );

	native_gen_initmemgc(mempsd, w, h, planes, bpp, linelen, size, addr);

	/* select a framebuffer subdriver based on planes and bpp*/
	subdriver = select_fb_subdriver(mempsd);
	if(!subdriver)
		return 0;

	/* set and initialize subdriver into mem screen driver*/
	if(!set_subdriver(mempsd, subdriver, TRUE))
		return 0;

	return 1;
}

/*
 * Set subdriver entry points in screen device
 * Initialize subdriver if init flag is TRUE
 * Return 0 on fail
 */
int set_subdriver(PSD psd, PSUBDRIVER subdriver, int init)
{
	/* set subdriver entry points in screen driver*/
	psd->DrawPixel 	= subdriver->DrawPixel;
	psd->ReadPixel 	= subdriver->ReadPixel;
	psd->DrawHLine 	= subdriver->DrawHLine;
	psd->PutHLine 	= subdriver->PutHLine;
	psd->GetHLine 	= subdriver->GetHLine;
	psd->DrawVLine 	= subdriver->DrawVLine;
	psd->PutVLine 	= subdriver->PutVLine;
	psd->GetVLine 	= subdriver->GetVLine;
	psd->Blit 	= subdriver->Blit;
	psd->PutBox	= subdriver->PutBox;
	psd->GetBox	= subdriver->GetBox;
	psd->PutBoxMask = subdriver->PutBoxMask;
	psd->CopyBox	= subdriver->CopyBox;

	/* call driver init procedure to calc map size and linelen*/
	if (init && !subdriver->Init(psd))
		return 0;
	return 1;
}

/* fill in a subdriver struct from passed screen device*/
void get_subdriver(PSD psd, PSUBDRIVER subdriver)
{
	/* set subdriver entry points in screen driver*/
	subdriver->DrawPixel 	= psd->DrawPixel;
	subdriver->ReadPixel 	= psd->ReadPixel;
	subdriver->DrawHLine 	= psd->DrawHLine;
	subdriver->PutHLine 	= psd->PutHLine;
	subdriver->GetHLine 	= psd->GetHLine;
	subdriver->DrawVLine 	= psd->DrawVLine;
	subdriver->PutVLine 	= psd->PutVLine;
	subdriver->GetVLine 	= psd->GetVLine;
	subdriver->Blit 	= psd->Blit;
	subdriver->PutBox	= psd->PutBox;
	subdriver->GetBox	= psd->GetBox;
	subdriver->PutBoxMask	= psd->PutBoxMask;
	subdriver->CopyBox	= psd->CopyBox;
}