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/*
* Copyright © 2008-2010 dragchan <zgchan317@gmail.com>
* This file is part of FbTerm.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/kd.h>
#include <linux/fb.h>
#include "fbdev.h"
#include "font.h"
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
static fb_fix_screeninfo finfo;
static fb_var_screeninfo vinfo;
static s32 fbdev_fd;
FbDev *FbDev::initFbDev()
{
s8 *fbdev = getenv("FRAMEBUFFER");
if (fbdev) {
fbdev_fd = open(fbdev, O_RDWR);
} else {
fbdev_fd = open("/dev/fb0", O_RDWR);
if (fbdev_fd < 0) fbdev_fd = open("/dev/fb/0", O_RDWR);
}
if (fbdev_fd < 0) {
fprintf(stderr, "can't open frame buffer device!\n");
return 0;
}
fcntl(fbdev_fd, F_SETFD, fcntl(fbdev_fd, F_GETFD) | FD_CLOEXEC);
ioctl(fbdev_fd, FBIOGET_FSCREENINFO, &finfo);
ioctl(fbdev_fd, FBIOGET_VSCREENINFO, &vinfo);
if (finfo.type != FB_TYPE_PACKED_PIXELS) {
fprintf(stderr, "unsupported frame buffer device!\n");
return 0;
}
switch (vinfo.bits_per_pixel) {
case 8:
if (finfo.visual != FB_VISUAL_PSEUDOCOLOR) {
fprintf(stderr, "only support pseudo-color visual with 8bpp depth!\n");
return 0;
}
break;
case 15:
case 16:
case 32:
if (finfo.visual != FB_VISUAL_TRUECOLOR && finfo.visual != FB_VISUAL_DIRECTCOLOR) {
fprintf(stderr, "only support true-color/direct-color visual with 15/16/32bpp depth!\n");
return 0;
}
break;
default:
fprintf(stderr, "only support frame buffer device with 8/15/16/32 color depth!\n");
return 0;
}
return new FbDev();
}
FbDev::FbDev()
{
mWidth = vinfo.xres;
mHeight = vinfo.yres;
mBitsPerPixel = vinfo.bits_per_pixel;
mBytesPerLine = finfo.line_length;
mVMemBase = (u8 *)mmap(0, finfo.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbdev_fd, 0);
if (mRotateType == Rotate0 || mRotateType == Rotate180) {
bool ypan = (vinfo.yres_virtual > vinfo.yres && finfo.ypanstep && !(FH(1) % finfo.ypanstep));
bool ywrap = (finfo.ywrapstep && !(FH(1) % finfo.ywrapstep));
if (ywrap && !(vinfo.vmode & FB_VMODE_YWRAP)) {
vinfo.vmode |= FB_VMODE_YWRAP;
ioctl(fbdev_fd, FBIOPUT_VSCREENINFO, &vinfo);
ywrap = (vinfo.vmode & FB_VMODE_YWRAP);
}
if ((ypan || ywrap) && !ioctl(fbdev_fd, FBIOPAN_DISPLAY, &vinfo)) {
if (ywrap) {
mScrollType = YWrap;
mOffsetMax = vinfo.yres_virtual - 1;
} else {
mScrollType = YPan;
mOffsetMax = vinfo.yres_virtual - vinfo.yres;
}
}
}
}
FbDev::~FbDev()
{
munmap(mVMemBase, finfo.smem_len);
close(fbdev_fd);
if (mScrollType != Redraw) {
ioctl(STDIN_FILENO, KDSETMODE, KD_GRAPHICS);
ioctl(STDIN_FILENO, KDSETMODE, KD_TEXT);
}
}
const s8 *FbDev::drvId()
{
return finfo.id;
}
void FbDev::setupOffset()
{
vinfo.yoffset = mOffsetCur;
ioctl(fbdev_fd, FBIOPAN_DISPLAY, &vinfo);
}
void FbDev::setupPalette(bool restore)
{
if (finfo.visual == FB_VISUAL_TRUECOLOR || (!restore && !mPalette)) return;
static bool palette_saved = false;
static u16 saved_red[256], saved_green[256], saved_blue[256];
u32 cols, rcols, gcols, bcols;
fb_cmap cmap;
#define INIT_CMAP(_red, _green, _blue) \
do { \
cmap.start = 0; \
cmap.len = cols; \
cmap.red = _red; \
cmap.green = _green; \
cmap.blue = _blue; \
cmap.transp = 0; \
} while (0)
if (finfo.visual == FB_VISUAL_PSEUDOCOLOR) cols = NR_COLORS;
else {
rcols = 1 << vinfo.red.length;
gcols = 1 << vinfo.green.length;
bcols = 1 << vinfo.blue.length;
cols = MAX(rcols, MAX(gcols, bcols));
}
if (restore) {
if (!palette_saved) return;
INIT_CMAP(saved_red, saved_green, saved_blue);
ioctl(fbdev_fd, FBIOPUTCMAP, &cmap);
} else {
if (!palette_saved) {
palette_saved = true;
INIT_CMAP(saved_red, saved_green, saved_blue);
ioctl(fbdev_fd, FBIOGETCMAP, &cmap);
}
u16 red[cols], green[cols], blue[cols];
if (finfo.visual == FB_VISUAL_PSEUDOCOLOR) {
for (u32 i = 0; i < NR_COLORS; i++) {
red[i] = (mPalette[i].red << 8) | mPalette[i].red;
green[i] = (mPalette[i].green << 8) | mPalette[i].green;
blue[i] = (mPalette[i].blue << 8) | mPalette[i].blue;
}
} else {
for (u32 i = 0; i < rcols; i++) {
red[i] = (65535 / (rcols - 1)) * i;
}
for (u32 i = 0; i < gcols; i++) {
green[i] = (65535 / (gcols - 1)) * i;
}
for (u32 i = 0; i < bcols; i++) {
blue[i] = (65535 / (bcols - 1)) * i;
}
}
INIT_CMAP(red, green, blue);
ioctl(fbdev_fd, FBIOPUTCMAP, &cmap);
}
}
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