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/*

 * Copyright (c) 2008 Martin Decky

 * 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/logo-196x66.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 <string.h>

#include <ddi/ddi.h>

#include <arch/types.h>

SPINLOCK_INITIALIZE(fb_lock);

static uint8_t *fb_addr;

static uint16_t *backbuf;

static uint8_t *glyphs;

static uint8_t *bgscan;

static unsigned int xres;

static unsigned int yres;

static unsigned int ylogo;

static unsigned int ytrim;

static unsigned int rowtrim;

static unsigned int scanline;

static unsigned int glyphscanline;

static unsigned int pixelbytes;

static unsigned int glyphbytes;

static unsigned int bgscanbytes;

static unsigned int cols;

static unsigned int rows;

static unsigned int position = 0;

#define BG_COLOR     0x000080

#define FG_COLOR     0xffff00

#define INV_COLOR    0xaaaaaa

#define RED(x, bits)         ((x >> (8 + 8 + 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 COL2X(col)           ((col) * FONT_WIDTH)

#define ROW2Y(row)           ((row) * FONT_SCANLINES)

#define X2COL(x)             ((x) / FONT_WIDTH)

#define Y2ROW(y)             ((y) / FONT_SCANLINES)

#define FB_POS(x, y)         ((y) * scanline + (x) * pixelbytes)

#define BB_POS(col, row)     ((row) * cols + (col))

#define GLYPH_POS(glyph, y)  ((glyph) * glyphbytes + (y) * glyphscanline)

static void (*rgb_conv)(void *, uint32_t);

/** ARGB 8:8:8:8 conversion

 *

 */

static void rgb_0888(void *dst, uint32_t rgb)

{

	*((uint32_t *) dst) = rgb & 0xffffff;

}

/** ABGR 8:8:8:8 conversion

 *

 */

static void bgr_0888(void *dst, uint32_t rgb)

{

	*((uint32_t *) dst)

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

}

/** RGB 8:8:8 conversion

 *

 */

static void rgb_888(void *dst, uint32_t rgb)

{

	((uint8_t *) dst)[0] = BLUE(rgb, 8);

	((uint8_t *) dst)[1] = GREEN(rgb, 8);

	((uint8_t *) dst)[2] = RED(rgb, 8);

}

/** BGR 8:8:8 conversion

 *

 */

static void bgr_888(void *dst, uint32_t rgb)

{

	((uint8_t *) dst)[0] = RED(rgb, 8);

	((uint8_t *) dst)[1] = GREEN(rgb, 8);

	((uint8_t *) dst)[2] = BLUE(rgb, 8);

}

/** RGB 5:5:5 conversion

 *

 */

static void rgb_555(void *dst, uint32_t rgb)

{

	*((uint16_t *) dst)

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

}

/** RGB 5:6:5 conversion

 *

 */

static void rgb_565(void *dst, uint32_t rgb)

{

	*((uint16_t *) dst)

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

}

/** RGB 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.

 *

 * Currently we set the palette on the ia32, amd64 and sparc64 port.

 *

 * Note that the byte is being inverted by this function. The reason is

 * that we would like to use a color palette where the white color code

 * is 0 and the black color code is 255, as some machines (Sun Blade 1500)

 * use these codes for black and white and prevent to set codes

 * 0 and 255 to other colors.

 *

 */

static void rgb_323(void *dst, uint32_t rgb)

{

	*((uint8_t *) dst)

	    = ~((RED(rgb, 3) << 5) | (GREEN(rgb, 2) << 3) | BLUE(rgb, 3));

}

/** Hide logo and refresh screen

 *

 */

static void logo_hide(bool silent)

{

	ylogo = 0;

	ytrim = yres;

	rowtrim = rows;

	if (!silent)

		fb_redraw();

}

/** Draw character at given position

 *

 */

static void glyph_draw(uint16_t glyph, unsigned int col, unsigned int row, bool silent, bool overlay)

{

	unsigned int x = COL2X(col);

	unsigned int y = ROW2Y(row);

	unsigned int yd;

	if (y >= ytrim)

		logo_hide(silent);

	if (!overlay)

		backbuf[BB_POS(col, row)] = glyph;

	if (!silent) {

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

			memcpy(&fb_addr[FB_POS(x, y + yd + ylogo)],

			    &glyphs[GLYPH_POS(glyph, yd)], glyphscanline);

	}

}

/** Scroll screen down by one row

 *

 *

 */

static void screen_scroll(bool silent)

{

	if (ylogo > 0) {

		logo_hide(silent);

		return;

	}

	if (!silent) {

		unsigned int row;

		for (row = 0; row < rows; row++) {

			unsigned int y = ROW2Y(row);

			unsigned int yd;

			for (yd = 0; yd < FONT_SCANLINES; yd++) {

				unsigned int x;

				unsigned int col;

				for (col = 0, x = 0; col < cols; col++,

				    x += FONT_WIDTH) {

					uint16_t glyph;

					if (row < rows - 1) {

						if (backbuf[BB_POS(col, row)] ==

						    backbuf[BB_POS(col, row + 1)])

							continue;

						glyph = backbuf[BB_POS(col, row + 1)];

					} else

						glyph = 0;

					memcpy(&fb_addr[FB_POS(x, y + yd)],

					    &glyphs[GLYPH_POS(glyph, yd)],

					    glyphscanline);

				}

			}

		}

	}

	memmove(backbuf, &backbuf[BB_POS(0, 1)], cols * (rows - 1) * sizeof(uint16_t));

	memsetw(&backbuf[BB_POS(0, rows - 1)], cols, 0);

}

static void cursor_put(bool silent)

{

	unsigned int col = position % cols;

	unsigned int row = position / cols;

	glyph_draw(fb_font_glyph(U_CURSOR), col, row, silent, true);

}

static void cursor_remove(bool silent)

{

	unsigned int col = position % cols;

	unsigned int row = position / cols;

	glyph_draw(backbuf[BB_POS(col, row)], col, row, silent, true);

}

/** Print character to screen

 *

 * Emulate basic terminal commands.

 *

 */

static void fb_putchar(outdev_t *dev, wchar_t ch, bool silent)

{

	spinlock_lock(&fb_lock);

	switch (ch) {

	case '\n':

		cursor_remove(silent);

		position += cols;

		position -= position % cols;

		break;

	case '\r':

		cursor_remove(silent);

		position -= position % cols;

		break;

	case '\b':

		cursor_remove(silent);

		if (position % cols)

			position--;

		break;

	case '\t':

		cursor_remove(silent);

		do {

			glyph_draw(fb_font_glyph(' '), position % cols,

			    position / cols, silent, false);

			position++;

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

		break;

	default:

		glyph_draw(fb_font_glyph(ch), position % cols,

		    position / cols, silent, false);

		position++;

	}

	if (position >= cols * rows) {

		position -= cols;

		screen_scroll(silent);

	}

	cursor_put(silent);

	spinlock_unlock(&fb_lock);

}

static outdev_t fb_console;

static outdev_operations_t fb_ops = {

	.write = fb_putchar

};

/** Render glyphs

 *

 * Convert glyphs from device independent font

 * description to current visual representation.

 *

 */

static void glyphs_render(void)

{

	/* Prerender glyphs */

	uint16_t glyph;

	for (glyph = 0; glyph < FONT_GLYPHS; glyph++) {

		uint32_t fg_color;

		if (glyph == FONT_GLYPHS - 1)

			fg_color = INV_COLOR;

		else

			fg_color = FG_COLOR;

		unsigned int y;

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

			unsigned int x;

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

				void *dst = &glyphs[GLYPH_POS(glyph, y) +

				    x * pixelbytes];

				uint32_t rgb = (fb_font[glyph][y] &

				    (1 << (7 - x))) ? fg_color : BG_COLOR;

				rgb_conv(dst, rgb);

			}

		}

	}

	/* Prerender background scanline */

	unsigned int x;

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

		rgb_conv(&bgscan[x * pixelbytes], BG_COLOR);

}

/** Refresh the screen

 *

 */

void fb_redraw(void)

{

	if (ylogo > 0) {

		unsigned int y;

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

			unsigned int x;

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

				rgb_conv(&fb_addr[FB_POS(x, y)],

				    (x < LOGO_WIDTH) ?

				    fb_logo[y * LOGO_WIDTH + x] :

				    LOGO_COLOR);

		}

	}

	unsigned int row;

	for (row = 0; row < rowtrim; row++) {

		unsigned int y = ylogo + ROW2Y(row);

		unsigned int yd;

		for (yd = 0; yd < FONT_SCANLINES; yd++) {

			unsigned int x;

			unsigned int col;

			for (col = 0, x = 0; col < cols;

			    col++, x += FONT_WIDTH) {

				uint16_t glyph = backbuf[BB_POS(col, row)];

				void *dst = &fb_addr[FB_POS(x, y + yd)];

				void *src = &glyphs[GLYPH_POS(glyph, yd)];

				memcpy(dst, src, glyphscanline);

			}

		}

	}

	if (COL2X(cols) < xres) {

		unsigned int y;

		unsigned int size = (xres - COL2X(cols)) * pixelbytes;

		for (y = ylogo; y < yres; y++)

			memcpy(&fb_addr[FB_POS(COL2X(cols), y)], bgscan, size);

	}

	if (ROW2Y(rowtrim) + ylogo < yres) {

		unsigned int y;

		for (y = ROW2Y(rowtrim) + ylogo; y < yres; y++)

			memcpy(&fb_addr[FB_POS(0, y)], bgscan, bgscanbytes);

	}

}

/** Initialize framebuffer as a output character 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(fb_properties_t *props)

{

	switch (props->visual) {

	case VISUAL_INDIRECT_8:

		rgb_conv = rgb_323;

		pixelbytes = 1;

		break;

	case VISUAL_RGB_5_5_5:

		rgb_conv = rgb_555;

		pixelbytes = 2;

		break;

	case VISUAL_RGB_5_6_5:

		rgb_conv = rgb_565;

		pixelbytes = 2;

		break;

	case VISUAL_RGB_8_8_8:

		rgb_conv = rgb_888;

		pixelbytes = 3;

		break;

	case VISUAL_BGR_8_8_8:

		rgb_conv = bgr_888;

		pixelbytes = 3;

		break;

	case VISUAL_RGB_8_8_8_0:

		rgb_conv = rgb_888;

		pixelbytes = 4;

		break;

	case VISUAL_RGB_0_8_8_8:

		rgb_conv = rgb_0888;

		pixelbytes = 4;

		break;

	case VISUAL_BGR_0_8_8_8:

		rgb_conv = bgr_0888;

		pixelbytes = 4;

		break;

	default:

		panic("Unsupported visual.");

	}

	xres = props->x;

	yres = props->y;

	scanline = props->scan;

	cols = X2COL(xres);

	rows = Y2ROW(yres);

	if (yres > ylogo) {

		ylogo = LOGO_HEIGHT;

		rowtrim = rows - Y2ROW(ylogo);

		if (ylogo % FONT_SCANLINES > 0)

			rowtrim--;

		ytrim = ROW2Y(rowtrim);

	} else {

		ylogo = 0;

		ytrim = yres;

		rowtrim = rows;

	}

	glyphscanline = FONT_WIDTH * pixelbytes;

	glyphbytes = ROW2Y(glyphscanline);

	bgscanbytes = xres * pixelbytes;

	size_t fbsize = scanline * yres;

	size_t bbsize = cols * rows * sizeof(uint16_t);

	size_t glyphsize = FONT_GLYPHS * glyphbytes;

	backbuf = (uint16_t *) malloc(bbsize, 0);

	if (!backbuf)

		panic("Unable to allocate backbuffer.");

	glyphs = (uint8_t *) malloc(glyphsize, 0);

	if (!glyphs)

		panic("Unable to allocate glyphs.");

	bgscan = malloc(bgscanbytes, 0);

	if (!bgscan)

		panic("Unable to allocate background pixel.");

	memsetw(backbuf, cols * rows, 0);

	glyphs_render();

	fb_addr = (uint8_t *) hw_map((uintptr_t) props->addr, fbsize);

	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, scanline);

	sysinfo_set_item_val("fb.visual", NULL, props->visual);

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

	fb_redraw();

	outdev_initialize("fb", &fb_console, &fb_ops);

	stdout = &fb_console;

}

/** @}

 */