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/*

 * Copyright (C) 2006 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <genarch/fb/font-8x16.h>

#include <genarch/fb/fb.h>

#include <console/chardev.h>

#include <console/console.h>

#include <print.h>

SPINLOCK_INITIALIZE(fb_lock);

static __u8 *fbaddress=NULL;

static int xres,yres;

static int position=0;

static int columns=0;

static int rows=0;

static int pixelbytes=0;

#define COL_WIDTH   8

#define ROW_HEIGHT  (FONT_SCANLINES)

#define ROW_PIX     (xres*ROW_HEIGHT*pixelbytes)

#define BGCOLOR   0x000080

#define FGCOLOR   0xffff00

#define RED(x,bits)    ((x >> (16+8-bits)) & ((1<<bits)-1))

#define GREEN(x,bits)  ((x >> (8+8-bits)) & ((1<<bits)-1))

#define BLUE(x,bits)   ((x >> (8-bits)) & ((1<<bits)-1))

#define POINTPOS(x,y)   ((y*xres+x)*pixelbytes)

/***************************************************************/

/* Pixel specific fuctions */

/** Draw pixel of given color on screen */

static inline void putpixel(int x,int y,int color)

{

    int startbyte = POINTPOS(x,y);

    if (pixelbytes == 3) {

        fbaddress[startbyte] = RED(color,8);

        fbaddress[startbyte+1] = GREEN(color,8);

        fbaddress[startbyte+2] = BLUE(color,8);

    } else if (pixelbytes == 4) {

        *((__u32 *)(fbaddress+startbyte)) = color;

    } else {

        int compcolor;

        /* 5-bit, 5-bits, 5-bits */

        compcolor = RED(color,5) << 10 \

            | GREEN(color,5) << 5 \

            | BLUE(color,5);

        *((__u16 *)(fbaddress+startbyte)) = compcolor;

    }

}

/** Return pixel color */

static inline int getpixel(int x,int y)

{

    int startbyte = POINTPOS(x,y);

    int color;

    int result;

    if (pixelbytes == 3) {

        result = fbaddress[startbyte] << 16 \

            | fbaddress[startbyte+1] << 8 \

            | fbaddress[startbyte+2];

    } else if (pixelbytes == 4) {

        result = *((__u32 *)(fbaddress+startbyte)) & 0xffffff;

    } else {

        int red,green,blue;

        color = *((__u16 *)(fbaddress+startbyte));

        red = (color >> 10) & 0x1f;

        green = (color >> 5) & 0x1f;

        blue = color & 0x1f;

        result = (red << 16) | (green << 8) | blue;

    }

    return result;

}

static void clear_line(int y);

/** Scroll screen one row up */

static void scroll_screen(void)

{

    int i;

    for (i=0;i < (xres*yres*pixelbytes)-ROW_PIX; i++)

        fbaddress[i] = fbaddress[i+ROW_PIX];

    /* Clear last row */

    for (i=0; i < ROW_HEIGHT;i++)

        clear_line((rows-1)*ROW_HEIGHT+i);

}

/***************************************************************/

/* Screen specific function */

/** Fill line with color BGCOLOR */

static void clear_line(int y)

{

    int x;

    for (x=0; x<xres;x++)

        putpixel(x,y,BGCOLOR);

}

/** Fill screen with background color */

static void clear_screen(void)

{

    int y;

    for (y=0; y<yres;y++)

        clear_line(y);

}

static void invert_pixel(int x, int y)

{

    putpixel(x,y, ~getpixel(x,y));

}

/** Draw one line of glyph at a given position */

static void draw_glyph_line(int glline, int x, int y)

{

    int i;

    for (i=0; i < 8; i++)

        if (glline & (1 << (7-i))) {

            putpixel(x+i,y,FGCOLOR);

        } else

            putpixel(x+i,y,BGCOLOR);

}

/***************************************************************/

/* Character-console functions */

/** Draw character at given position */

static void draw_glyph(__u8 glyph, int col, int row)

{

    int y;

    for (y=0; y < FONT_SCANLINES; y++)

        draw_glyph_line(fb_font[glyph*FONT_SCANLINES+y],

                col*COL_WIDTH, row*ROW_HEIGHT+y);

}

/** Invert character at given position */

static void invert_char(int col, int row)

{

    int x,y;

    for (x=0; x < COL_WIDTH; x++)

        for (y=0; y < FONT_SCANLINES; y++)

            invert_pixel(col*COL_WIDTH+x,row*ROW_HEIGHT+y);

}

/** Draw character at default position */

static void draw_char(char chr)

{

    draw_glyph(chr, position % columns, position/columns);

}

/***************************************************************/

/* Stdout specific functions */

static void invert_cursor(void)

{

    invert_char(position % columns, position/columns);

}

/** Print character to screen

 *

 *  Emulate basic terminal commands

 */

static void fb_putchar(chardev_t *dev, char ch)

{

    spinlock_lock(&fb->lock);

    if (ch == '\n') {

        invert_cursor();

        position += columns;

        position -= position % columns;

    } else if (ch == '\r') {

        invert_cursor();

        position -= position % columns;

    } else if (ch == '\b') {

        invert_cursor();

        if (position % columns)

            position--;

    } else if (ch == '\t') {

        invert_cursor();

        do {

            draw_char(' ');

            position++;

        } while (position % 8);

    } else {

        draw_char(ch);

        position++;

    }

    if (position >= columns*rows) {

        position -= columns;

        scroll_screen();

    }

    invert_cursor();

    spinlock_unlock(&fb->lock);

}

static chardev_t framebuffer;

static chardev_operations_t fb_ops = {

    .write = fb_putchar,

};

/** Initialize framebuffer as a chardev output device

 *

 * @param addr Address of framebuffer

 * @param x X resolution

 * @param y Y resolution

 * @param bytes Bytes per pixel (2,3,4)

 */

void fb_init(__address addr, int x, int y, int bytes)

{

    fbaddress = (unsigned char *)addr;

    xres = x;

    yres = y;

    pixelbytes = bytes;

    rows = y/ROW_HEIGHT;

    columns = x/COL_WIDTH;

    clear_screen();

    invert_cursor();

    chardev_initialize("fb", &framebuffer, &fb_ops);

    stdout = &framebuffer;

}