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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.

 */

/** @addtogroup genarch	

 * @{

 */

/** @file

 */

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

#include <genarch/fb/visuals.h>

#include <genarch/fb/fb.h>

#include <console/chardev.h>

#include <console/console.h>

#include <sysinfo/sysinfo.h>

#include <mm/slab.h>

#include <align.h>

#include <panic.h>

#include <memstr.h>

#include <config.h>

#include <bitops.h>

#include <print.h>

#include <ddi/ddi.h>

#include "helenos.xbm"

static parea_t fb_parea;		/**< Physical memory area for fb. */

SPINLOCK_INITIALIZE(fb_lock);

static uint8_t *fbaddress = NULL;

static uint8_t *blankline = NULL;

static uint8_t *dbbuffer = NULL; /* Buffer for fast scrolling console */

static int dboffset;

static unsigned int xres = 0;

static unsigned int yres = 0;

static unsigned int scanline = 0;

static unsigned int pixelbytes = 0;

#ifdef FB_INVERT_COLORS

static bool invert_colors = true;

#else

static bool invert_colors = false;

#endif

static unsigned int position = 0;

static unsigned int columns = 0;

static unsigned int rows = 0;

#define COL_WIDTH	8

#define ROW_BYTES	(scanline * FONT_SCANLINES)

#define BGCOLOR		0x000080

#define FGCOLOR		0xffff00

#define LOGOCOLOR	0x2020b0

#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) * scanline + (x) * pixelbytes)

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

/* Pixel specific fuctions */

static void (*rgb2scr)(void *, int);

static int (*scr2rgb)(void *);

static inline int COLOR(int color)

{

	return invert_colors ? ~color : color;

}

/* Conversion routines between different color representations */

static void rgb_byte0888(void *dst, int rgb)

{

	*((int *) dst) = rgb;

}

static int byte0888_rgb(void *src)

{

	return (*((int *) src)) & 0xffffff;

}

static void bgr_byte0888(void *dst, int rgb)

{

	*((uint32_t *) dst) = BLUE(rgb, 8) << 16 | GREEN(rgb, 8) << 8 | RED(rgb, 8);

}

static int byte0888_bgr(void *src)

{

	int color = *(uint32_t *)(src);

	return ((color & 0xff) << 16) | (((color >> 8) & 0xff) << 8) | ((color >> 16) & 0xff);

}

static void rgb_byte888(void *dst, int rgb)

{

	uint8_t *scr = dst;

#if defined(FB_INVERT_ENDIAN)

	scr[0] = RED(rgb, 8);

	scr[1] = GREEN(rgb, 8);

	scr[2] = BLUE(rgb, 8);

#else

	scr[2] = RED(rgb, 8);

	scr[1] = GREEN(rgb, 8);

	scr[0] = BLUE(rgb, 8);

#endif

}

static int byte888_rgb(void *src)

{

	uint8_t *scr = src;

#if defined(FB_INVERT_ENDIAN)

	return scr[0] << 16 | scr[1] << 8 | scr[2];

#else

	return scr[2] << 16 | scr[1] << 8 | scr[0];

#endif	

}

/**  16-bit depth (5:5:5) */

static void rgb_byte555(void *dst, int rgb)

{

	/* 5-bit, 5-bits, 5-bits */ 

	*((uint16_t *) dst) = RED(rgb, 5) << 10 | GREEN(rgb, 5) << 5 | BLUE(rgb, 5);

}

/** 16-bit depth (5:5:5) */

static int byte555_rgb(void *src)

{

	int color = *(uint16_t *)(src);

	return (((color >> 10) & 0x1f) << (16 + 3)) | (((color >> 5) & 0x1f) << (8 + 3)) | ((color & 0x1f) << 3);

}

/**  16-bit depth (5:6:5) */

static void rgb_byte565(void *dst, int rgb)

{

	/* 5-bit, 6-bits, 5-bits */ 

	*((uint16_t *) dst) = RED(rgb, 5) << 11 | GREEN(rgb, 6) << 5 | BLUE(rgb, 5);

}

/** 16-bit depth (5:6:5) */

static int byte565_rgb(void *src)

{

	int color = *(uint16_t *)(src);

	return (((color >> 11) & 0x1f) << (16 + 3)) | (((color >> 5) & 0x3f) << (8 + 2)) | ((color & 0x1f) << 3);

}

/** Put pixel - 8-bit depth (color palette/3:2:3)

 *

 * Even though we try 3:2:3 color scheme here, an 8-bit framebuffer

 * will most likely use a color palette. The color appearance

 * will be pretty random and depend on the default installed

 * palette. This could be fixed by supporting custom palette

 * and setting it to simulate the 8-bit truecolor.

 */

static void rgb_byte8(void *dst, int rgb)

{

	*((uint8_t *) dst) = RED(rgb, 3) << 5 | GREEN(rgb, 2) << 3 | BLUE(rgb, 3);

}

/** Return pixel color - 8-bit depth (color palette/3:2:3)

 *

 * See the comment for rgb_byte().

 */

static int byte8_rgb(void *src)

{

	int color = *(uint8_t *)src;

	return (((color >> 5) & 0x7) << (16 + 5)) | (((color >> 3) & 0x3) << (8 + 6)) | ((color & 0x7) << 5);

}

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

{

	(*rgb2scr)(&fbaddress[POINTPOS(x, y)], COLOR(color));

	if (dbbuffer) {

		int dline = (y + dboffset) % yres;

		(*rgb2scr)(&dbbuffer[POINTPOS(x, dline)], COLOR(color));

	}

}

/** Get pixel from viewport */

static int getpixel(unsigned int x, unsigned int y)

{

	if (dbbuffer) {

		int dline = (y + dboffset) % yres;

		return COLOR((*scr2rgb)(&dbbuffer[POINTPOS(x, dline)]));

	}

	return COLOR((*scr2rgb)(&fbaddress[POINTPOS(x, y)]));

}

/** Fill screen with background color */

static void clear_screen(void)

{

	unsigned int y;

	for (y = 0; y < yres; y++) {

		memcpy(&fbaddress[scanline * y], blankline, xres * pixelbytes);

		if (dbbuffer)

			memcpy(&dbbuffer[scanline * y], blankline, xres * pixelbytes);

	}

}

/** Scroll screen one row up */

static void scroll_screen(void)

{

	uint8_t *lastline = &fbaddress[(rows - 1) * ROW_BYTES];

	int firstsz;

	if (dbbuffer) {

		memcpy(&dbbuffer[dboffset * scanline], blankline, ROW_BYTES);

		dboffset = (dboffset + FONT_SCANLINES) % yres;

		firstsz = yres - dboffset;

		memcpy(fbaddress, &dbbuffer[scanline * dboffset], firstsz * scanline);

		memcpy(&fbaddress[firstsz * scanline], dbbuffer, dboffset * scanline);

	} else {

		memcpy((void *) fbaddress, (void *) &fbaddress[ROW_BYTES], scanline * yres - ROW_BYTES);

		/* Clear last row */

		memcpy((void *) lastline, (void *) blankline, ROW_BYTES);

	}

}

static void invert_pixel(unsigned int x, unsigned int y)

{

	putpixel(x, y, ~getpixel(x, y));

}

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

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

{

	unsigned 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(uint8_t glyph, unsigned int col, unsigned int row)

{

	unsigned int y;

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

		draw_glyph_line(fb_font[glyph * FONT_SCANLINES + y], col * COL_WIDTH, row * FONT_SCANLINES + y);

}

/** Invert character at given position */

static void invert_char(unsigned int col, unsigned int row)

{

	unsigned int x;

	unsigned int y;

	for (x = 0; x < COL_WIDTH; x++)

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

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

}

/** Draw character at default position */

static void draw_char(char chr)

{

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

}

static void draw_logo(unsigned int startx, unsigned int starty)

{

	unsigned int x;

	unsigned int y;

	unsigned int byte;

	unsigned int rowbytes;

	rowbytes = (helenos_width - 1) / 8 + 1;

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

		for (x = 0; x < helenos_width; x++) {

			byte = helenos_bits[rowbytes * y + x / 8];

			byte >>= x % 8;

			if (byte & 1)

				putpixel(startx + x, starty + y, COLOR(LOGOCOLOR));

		}

}

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

/* 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);

	switch (ch) {

	case '\n':

		invert_cursor();

		position += columns;

		position -= position % columns;

		break;

	case '\r':

		invert_cursor();

		position -= position % columns;

		break;

	case '\b':

		invert_cursor();

		if (position % columns)

			position--;

		break;

	case '\t':

		invert_cursor();

		do {

			draw_char(' ');

			position++;

		} while ((position % 8) && position < columns * rows);

		break;

	default:

		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   Physical address of the framebuffer

 * @param x      Screen width in pixels

 * @param y      Screen height in pixels

 * @param scan   Bytes per one scanline

 * @param visual Color model

 *

 */

void fb_init(uintptr_t addr, unsigned int x, unsigned int y, unsigned int scan, unsigned int visual)

{

	switch (visual) {

	case VISUAL_INDIRECT_8:

		rgb2scr = rgb_byte8;

		scr2rgb = byte8_rgb;

		pixelbytes = 1;

		break;

	case VISUAL_RGB_5_5_5:

		rgb2scr = rgb_byte555;

		scr2rgb = byte555_rgb;

		pixelbytes = 2;

		break;

	case VISUAL_RGB_5_6_5:

		rgb2scr = rgb_byte565;

		scr2rgb = byte565_rgb;

		pixelbytes = 2;

		break;

	case VISUAL_RGB_8_8_8:

		rgb2scr = rgb_byte888;

		scr2rgb = byte888_rgb;

		pixelbytes = 3;

		break;

	case VISUAL_RGB_8_8_8_0:

		rgb2scr = rgb_byte888;

		scr2rgb = byte888_rgb;

		pixelbytes = 4;

		break;

	case VISUAL_RGB_0_8_8_8:

		rgb2scr = rgb_byte0888;

		scr2rgb = byte0888_rgb;

		pixelbytes = 4;

		break;

	case VISUAL_BGR_0_8_8_8:

		rgb2scr = bgr_byte0888;

		scr2rgb = byte0888_bgr;

		pixelbytes = 4;

		break;

	default:

		panic("Unsupported visual.\n");

	}

	unsigned int fbsize = scan * y;

	/* Map the framebuffer */

	fbaddress = (uint8_t *) hw_map((uintptr_t) addr, fbsize);

	xres = x;

	yres = y;

	scanline = scan;

	rows = y / FONT_SCANLINES;

	columns = x / COL_WIDTH;

	fb_parea.pbase = (uintptr_t) addr;

	fb_parea.vbase = (uintptr_t) fbaddress;

	fb_parea.frames = SIZE2FRAMES(fbsize);

	fb_parea.cacheable = false;

	ddi_parea_register(&fb_parea);

	sysinfo_set_item_val("fb", NULL, true);

	sysinfo_set_item_val("fb.kind", NULL, 1);

	sysinfo_set_item_val("fb.width", NULL, xres);

	sysinfo_set_item_val("fb.height", NULL, yres);

	sysinfo_set_item_val("fb.scanline", NULL, scan);

	sysinfo_set_item_val("fb.visual", NULL, visual);

	sysinfo_set_item_val("fb.address.physical", NULL, addr);

	sysinfo_set_item_val("fb.address.color", NULL, PAGE_COLOR((uintptr_t)

		fbaddress));

	sysinfo_set_item_val("fb.invert-colors", NULL, invert_colors);

	/* Allocate double buffer */

	unsigned int order = fnzb(SIZE2FRAMES(ALIGN_UP(fbsize, FRAME_SIZE))) + 1;

	dbbuffer = (uint8_t * ) frame_alloc(order, FRAME_ATOMIC | FRAME_KA);

	if (!dbbuffer)

		printf("Failed to allocate scroll buffer.\n");

	dboffset = 0;

	/* Initialized blank line */

	blankline = (uint8_t *) malloc(ROW_BYTES, FRAME_ATOMIC);

	if (!blankline)

		panic("Failed to allocate blank line for framebuffer.");

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

		for (x = 0; x < xres; x++)

			(*rgb2scr)(&blankline[POINTPOS(x, y)], COLOR(BGCOLOR));

	clear_screen();

	/* Update size of screen to match text area */

	yres = rows * FONT_SCANLINES;

	draw_logo(xres - helenos_width, 0);

	invert_cursor();

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

	stdout = &framebuffer;

}

/** @}

 */