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836 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <fb/font-8x16.h>
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#include <fb/fb.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <print.h>
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SPINLOCK_INITIALIZE(fb_lock);
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static unsigned char *fbaddress=NULL;
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static int xres,yres;
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static int position=0;
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static int columns=0;
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static int rows=0;
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#define COL_WIDTH   8
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#define ROW_HEIGHT  (FONT_SCANLINES)
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#define ROW_PIX     (xres*ROW_HEIGHT*3)
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#define BGCOLOR   0x000080
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#define FGCOLOR   0xffff00
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#define RED(x)    ((x >> 16) & 0xff)
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#define GREEN(x)  ((x >> 8) & 0xff)
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#define BLUE(x)   (x & 0xff)
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#define POINTPOS(x,y,colidx)   ((y*xres+x)*3+colidx)
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/** Draw pixel of given color on screen */
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static inline void putpixel(int x,int y,int color)
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{
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    fbaddress[POINTPOS(x,y,0)] = RED(color);
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    fbaddress[POINTPOS(x,y,1)] = GREEN(color);
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    fbaddress[POINTPOS(x,y,2)] = BLUE(color);
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}
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/** Fill line with color BGCOLOR */
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static void clear_line(int y)
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{
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    int x;
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    for (x=0; x<xres;x++)
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        putpixel(x,y,BGCOLOR);
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}
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/** Fill screen with background color */
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static void clear_screen(void)
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{
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    int y;
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    for (y=0; y<yres;y++)
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        clear_line(y);
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}
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static void invert_pixel(int x, int y)
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{
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    fbaddress[POINTPOS(x,y,0)] = ~fbaddress[POINTPOS(x,y,0)];
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    fbaddress[POINTPOS(x,y,1)] = ~fbaddress[POINTPOS(x,y,1)];
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    fbaddress[POINTPOS(x,y,2)] = ~fbaddress[POINTPOS(x,y,2)];
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}
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/** Scroll screen one row up */
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static void scroll_screen(void)
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{
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    int i;
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    for (i=0;i < (xres*yres*3)-ROW_PIX; i++)
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        fbaddress[i] = fbaddress[i+ROW_PIX];
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    /* Clear last row */
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    for (i=0; i < ROW_HEIGHT;i++)
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        clear_line((rows-1)*ROW_HEIGHT+i);
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}
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/** Draw one line of glyph at a given position */
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static void draw_glyph_line(int glline, int x, int y)
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{
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    int i;
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    for (i=0; i < 8; i++)
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        if (glline & (1 << (7-i))) {
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            putpixel(x+i,y,FGCOLOR);
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        } else
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            putpixel(x+i,y,BGCOLOR);
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}
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/** Draw character at given position */
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static void draw_glyph(unsigned char glyph, int col, int row)
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{
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    int y;
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    for (y=0; y < FONT_SCANLINES; y++)
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        draw_glyph_line(fb_font[glyph*FONT_SCANLINES+y],
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                col*COL_WIDTH, row*ROW_HEIGHT+y);
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}
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/** Invert character at given position */
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static void invert_char(int col, int row)
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{
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    int x,y;
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    for (x=0; x < COL_WIDTH; x++)
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        for (y=0; y < FONT_SCANLINES; y++)
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            invert_pixel(col*COL_WIDTH+x,row*ROW_HEIGHT+y);
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}
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/** Draw character at default position */
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static void draw_char(char chr)
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{
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    draw_glyph(chr, position % columns, position/columns);
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}
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static void invert_cursor(void)
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{
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    invert_char(position % columns, position/columns);
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}
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/** Print character to screen
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 *
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 *  Emulate basic terminal commands
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 */
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static void fb_putchar(chardev_t *dev, char ch)
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{
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    spinlock_lock(&fb->lock);
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    if (ch == '\n') {
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        invert_cursor();
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        position += columns;
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        position -= position % columns;
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    } else if (ch == '\r') {
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        invert_cursor();
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        position -= position % columns;
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    } else if (ch == '\b') {
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        invert_cursor();
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        if (position % columns)
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            position--;
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    } else {
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        draw_char(ch);
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        position++;
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    }
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    if (position >= columns*rows) {
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        position -= columns;
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        scroll_screen();
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    }
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    invert_cursor();
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    spinlock_unlock(&fb->lock);
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}
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static chardev_t framebuffer;
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static chardev_operations_t fb_ops = {
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    .write = fb_putchar,
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};
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/** Initialize framebuffer as a chardev output device
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 *
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 * @param addr Address of framebuffer
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 * @param x X resolution
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 * @param y Y resolution
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 */
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void fb_init(__address addr, int x, int y)
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{
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    fbaddress = (unsigned char *)addr;
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    xres = x;
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    yres = y;
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    rows = y/ROW_HEIGHT;
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    columns = x/COL_WIDTH;
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    clear_screen();
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    invert_cursor();
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    chardev_initialize("fb", &framebuffer, &fb_ops);
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    stdout = &framebuffer;
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}
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