scr_fbbak.c

在ｅｃｏｓ 下mingui 的移植开发

/*
 * Copyright (c) 1999, 2000 Greg Haerr <[e-mail]>
 *
 * Microwindows Screen Driver for Linux kernel framebuffers
 *
 * Portions used from Ben Pfaff's BOGL <[e-mail]>
 * 
 * Note: modify select_fb_driver() to add new framebuffer subdrivers
 * 2000/10/20 Modified by Song Lixin  to be used under MiniGUI.
 */
#define _GNU_SOURCE 1
#include <assert.h>
#include <fcntl.h>
#include <limits.h>
#include <linux/fb.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>

#include <sys/types.h>
#include <unistd.h>
#ifndef __ECOS
# include <syslog.h>
#endif

#include "native.h"
#include "fb.h"

#define HAVETEXTMODE	0	/* =0 for graphics only systems*/

#ifndef FB_TYPE_VGA_PLANES
#define FB_TYPE_VGA_PLANES 4
#endif


/* static variables*/
static int fb;			/* Framebuffer file handle. */
static int status;		/* 0=never inited, 1=once inited, 2=inited. */
static short saved_red[16];	/* original hw palette*/
static short saved_green[16];
static short saved_blue[16];

/* init framebuffer*/
static PSD fb_open(PSD psd)
{
	char *	env;
	int	type, visual;
	PSUBDRIVER subdriver;
#if HAVETEXTMODE
	int	tty;
#endif
	struct fb_fix_screeninfo fb_fix;
	struct fb_var_screeninfo fb_var;

	assert(status < 2);

	/* locate and open framebuffer, get info*/
	if(!(env = getenv("FRAMEBUFFER")))
		env = "/dev/fb0";
	fb = open(env, O_RDWR);
	if(fb < 0) {
		fprintf(stderr,"GAL ENGINE: Error when opening %s: %m. Please check kernel config.\n", env);
		return NULL;
	}
	if(ioctl(fb, FBIOGET_FSCREENINFO, &fb_fix) == -1 ||
		ioctl(fb, FBIOGET_VSCREENINFO, &fb_var) == -1) {
			fprintf(stderr,"GAL ENGINE: Error when reading screen info: %m.\n");
			goto fail;
	}
	/* setup screen device from framebuffer info*/
	type = fb_fix.type;
	visual = fb_fix.visual;

	psd->xres = psd->xvirtres = fb_var.xres;
	psd->yres = psd->yvirtres = fb_var.yres;
	/* set planes from fb type*/
	if (type == FB_TYPE_VGA_PLANES)
		psd->planes = 4;
	else if (type == FB_TYPE_PACKED_PIXELS)
		psd->planes = 1;
	else psd->planes = 0;	/* force error later*/

	psd->bpp = fb_var.bits_per_pixel;
	psd->ncolors = (psd->bpp >= 24)? (1 << 24): (1 << psd->bpp);

	/* set linelen to byte length, possibly converted later*/
	psd->linelen = fb_fix.line_length;
	psd->size = 0;		/* force subdriver init of size*/

	//syslog(LOG_INFO,"psd->planes:%d,psd->bpp:%d,psd->ncolors:%d,psd->linelen:%d", psd->planes,psd->bpp,psd->ncolors,psd->linelen);

	psd->flags = PSF_SCREEN | PSF_HAVEBLIT;
	if (psd->bpp == 16)
		psd->flags |= PSF_HAVEOP_COPY;

	/* set pixel format*/
	if(visual == FB_VISUAL_TRUECOLOR || visual == FB_VISUAL_DIRECTCOLOR) {
		switch(psd->bpp) {
		case 8:
			psd->pixtype = PF_TRUECOLOR332;
		break;
		case 16:
			psd->pixtype = PF_TRUECOLOR565;
		break;
		case 24:
			psd->pixtype = PF_TRUECOLOR888;
		break;
		case 32:
			psd->pixtype = PF_TRUECOLOR0888;
		break;
		default:
			fprintf(stderr, "GAL ENGINE: Unsupported FrameBuffer\n");
			goto fail;
		}
	} else psd->pixtype = PF_PALETTE;

	/* select a framebuffer subdriver based on planes and bpp*/
	subdriver = select_fb_subdriver(psd);
	if (!subdriver) {
		fprintf(stderr,"GAL ENGINE: No driver for screen type %d visual %d bpp %d\n",
			type, visual, psd->bpp);
		goto fail;
	}

	/*
	 * set and initialize subdriver into screen driver
	 * psd->size is calculated by subdriver init
	 */
	if(!set_subdriver(psd, subdriver, TRUE)) {
		fprintf(stderr,"GAL ENGINE: Driver initialize failed type %d visual %d bpp %d\n",
			type, visual, psd->bpp);
		goto fail;
	}

#if HAVETEXTMODE
	/* open tty, enter graphics mode*/
	tty = open ("/dev/tty", O_RDWR);
	if(tty < 0) {
		fprintf(stderr,"GAL ENGINE: Can't open /dev/tty: %m\n");
		goto fail;
	}
	if(ioctl (tty, KDSETMODE, KD_GRAPHICS) == -1) {
		fprintf(stderr,"GAL ENGINE: Error when setting graphics mode: %m\n");
		fprintf(stderr,"GAL ENGINE: Maybe not a virtual console.\n");
		close(tty);
		goto fail;
	}
	close(tty);
#endif
	/* mmap framebuffer into this address space*/
	psd->size = (psd->size + getpagesize () - 1)
			/ getpagesize () * getpagesize ();
	psd->addr = mmap(NULL, psd->size, PROT_READ|PROT_WRITE,MAP_SHARED,fb,0);
	if(psd->addr == NULL || psd->addr == (unsigned char *)-1) {
		fprintf(stderr,"GAL ENGINE: Error when mmaping %s: %m\n", env);
		goto fail;
	}
	/* save original palette*/
	ioctl_getpalette(0, 16, saved_red, saved_green, saved_blue);
	status = 2;
	psd->gr_mode = MODE_SET;
	return psd;	/* success*/

fail:
#if HAVETEXTMODE
	/* enter text mode*/
	tty = open ("/dev/tty", O_RDWR);
	ioctl(tty, KDSETMODE, KD_TEXT);
	close(tty);
#endif
	close(fb);
	return NULL;
}

/* close framebuffer*/
static void fb_close(PSD psd)
{
#if HAVETEXTMODE
	int	tty;
#endif

	/* if not opened, return*/
	if(status != 2)
		return;
	status = 1;

  	/* reset hw palette*/
	ioctl_setpalette(0, 16, saved_red, saved_green, saved_blue);
  
	/* unmap framebuffer*/
	munmap(psd->addr, psd->size);
  
#if HAVETEXTMODE
	/* enter text mode*/
	tty = open ("/dev/tty", O_RDWR);
	ioctl(tty, KDSETMODE, KD_TEXT);
	close(tty);
#endif
	/* close framebuffer*/
	close(fb);
}


static int fade = 100;

static void fb_setpalette(PSD psd,int first, int count, gal_color *palette)
{
	int 	i;
	unsigned short 	red[count];
	unsigned short 	green[count];
	unsigned short 	blue[count];

	/* convert palette to framebuffer format*/
	for(i=0; i < count; i++) {
		gal_color *p = &palette[i];

		/* grayscale computation:
		 * red[i] = green[i] = blue[i] =
		 *	(p->r * 77 + p->g * 151 + p->b * 28);
		 */
		red[i] = (p->r * fade / 100) << 8;
		green[i] = (p->g * fade / 100) << 8;
		blue[i] = (p->b * fade / 100) << 8;
	}
	ioctl_setpalette(first, count, red, green, blue);
}

static void fb_getpalette(PSD psd,int first, int count, gal_color *palette)
{
	int 	i;
	unsigned short 	red[count];
	unsigned short 	green[count];
	unsigned short 	blue[count];

	ioctl_getpalette(first,count,red,green,blue);
	for(i=0; i < count; i++) {
		gal_color *p = &palette[i];

		/* grayscale computation:
		 * red[i] = green[i] = blue[i] =
		 *	(p->r * 77 + p->g * 151 + p->b * 28);
		 */
		p->r = (red[i] >> 8) * 100 / fade;
		p->g = (green[i] >>8) * 100 / fade;
		p->b = (blue[i] >>8) * 100 / fade;
	}
}

/* get framebuffer palette*/
void ioctl_getpalette(int start, int len, short *red, short *green, short *blue)
{
	struct fb_cmap cmap;

	cmap.start = start;
	cmap.len = len;
	cmap.red = red;
	cmap.green = green;
	cmap.blue = blue;
	cmap.transp = NULL;

	ioctl(fb, FBIOGETCMAP, &cmap);
}

/* set framebuffer palette*/
void ioctl_setpalette(int start, int len, short *red, short *green, short *blue)
{
	struct fb_cmap cmap;

	cmap.start = start;
	cmap.len = len;
	cmap.red = red;
	cmap.green = green;
	cmap.blue = blue;
	cmap.transp = NULL;

	ioctl(fb, FBIOPUTCMAP, &cmap);
}


SCREENDEVICE	scrdev = {
	0, 0, 0, 0, 0, 
	0, 0, 0, 0, 0, 
	0, 0, 0, 0, 0, 
	0, 0, 0, 0, 
	NULL,
	fb_open,
	fb_close,
	fb_setpalette,
	fb_getpalette,
	native_gen_allocatememgc,
	fb_mapmemgc,
	native_gen_freememgc,
	native_gen_clippoint,
	native_gen_fillrect,
	NULL,			/* DrawPixel subdriver*/
	NULL,			/* ReadPixel subdriver*/
	NULL,			/* DrawHLine subdriver*/
	NULL,			/* PutHLine subdriver*/
	NULL,			/* GetHLine subdriver*/
	NULL,			/* DrawVLine subdriver*/
	NULL,			/* PutVLine subdriver*/
	NULL,			/* GetVLine subdriver*/
	NULL,			/* Blit subdriver*/
	NULL,			/* PutBox subdriver*/
	NULL			/* CopyBox subdriver*/
};