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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 <sys/param.h>
#include <sys/types.h>
#include <sys/ascii.h>
#include <dev/video/fbdev.h>
#include <dev/cons/font.h>
#include <dev/cons/cons.h>
#include <vm/dynalloc.h>
#include <string.h>
struct cons_screen g_root_scr = {0};
/*
* Create a chracter descriptor for drawing
* characters.
*
* @c: Character.
* @fg: Foreground.
* @bg: Background.
*/
static inline struct cons_char
cons_make_char(char c, uint32_t fg, uint32_t bg)
{
struct cons_char ch;
ch.fg = fg;
ch.bg = bg;
ch.c = c;
return ch;
}
/*
* Render a character onto the screen.
*
* @scr: Screen to render to.
* @c: Char to render.
* @x: X position of char.
* @y: Y position of char.
*/
static void
cons_render_char(struct cons_screen *scr, struct cons_char ch,
uint32_t x, uint32_t y)
{
char c = ch.c;
size_t idx;
const uint8_t *glyph;
if (scr->fb_mem == NULL) {
return;
}
glyph = &CONS_FONT[(int)c*16];
for (uint32_t cy = 0; cy < FONT_HEIGHT; ++cy) {
for (uint32_t cx = 0; cx < FONT_WIDTH; ++cx) {
idx = fbdev_get_index(&scr->fbdev, x+FONT_WIDTH-cx, y+cy);
scr->fb_mem[idx] = ISSET(glyph[cy], BIT(cx)) ? ch.fg : ch.bg;
}
}
}
static void
cons_draw_cursor(struct cons_screen *scr, uint32_t color)
{
struct cons_char cursor_chr;
cursor_chr.fg = scr->fg;
cursor_chr.bg = color;
cursor_chr.c = ' ';
cons_render_char(scr, cursor_chr, scr->curs_col * FONT_WIDTH,
scr->curs_row * FONT_HEIGHT);
}
static void
cons_move_cursor(struct cons_screen *scr, uint32_t col, uint32_t row)
{
cons_draw_cursor(scr, scr->bg);
scr->curs_col = col;
scr->curs_row = row;
cons_draw_cursor(scr, scr->last_chr.fg);
}
/*
* Clear the screen.
*
* @scr: Screen to clear.
* @bg: Color to clear it to.
*/
static void
cons_clear_scr(struct cons_screen *scr, uint32_t bg)
{
struct fbdev fbdev = scr->fbdev;
for (size_t i = 0; i < fbdev.height * fbdev.pitch; ++i) {
scr->fb_mem[i] = bg;
}
}
/*
* Handle a special character (e.g "\t", "\n", etc)
*
* @scr: Screen to handle this on.
* @c: Char to handle.
*
* Returns 0 if handled, otherwise -1.
*/
static int
cons_handle_special(struct cons_screen *scr, char c)
{
switch (c) {
case ASCII_LF:
/* Make a newline */
scr->ch_col = 0;
++scr->ch_row;
cons_move_cursor(scr, 0, scr->curs_row + 1);
return 0;
}
return -1;
}
/*
* Put a character on the screen.
*
* @scr: Screen.
* @c: Character to draw.
*/
int
cons_putch(struct cons_screen *scr, char c)
{
struct cons_char cons_chr;
if (scr->ch_col > scr->ncols) {
/* Make a newline as we past the max col */
scr->ch_col = 0;
++scr->ch_row;
}
if (scr->curs_row >= scr->nrows) {
/* Went over the screen size */
scr->ch_col = 0;
scr->ch_row = 0;
cons_clear_scr(scr, scr->bg);
cons_move_cursor(scr, 0, 0);
}
/*
* If this is a special char that we can handle
* then handle it and return.
*/
if (cons_handle_special(scr, c) == 0) {
return 0;
}
cons_chr = cons_make_char(c, scr->fg, scr->bg);
scr->last_chr = cons_chr;
/* Draw cursor and character */
cons_move_cursor(scr, scr->curs_col + 1, scr->curs_row);
cons_render_char(scr, cons_chr, scr->ch_col * FONT_WIDTH,
scr->ch_row * FONT_HEIGHT);
++scr->ch_col;
return 0;
}
void
cons_init(void)
{
struct fbdev fbdev = fbdev_get();
g_root_scr.fg = 0x00AA00;
g_root_scr.bg = 0x000000;
g_root_scr.fb_mem = fbdev.mem;
g_root_scr.nrows = fbdev.height / FONT_HEIGHT;
g_root_scr.ncols = fbdev.width / FONT_WIDTH;
g_root_scr.fbdev = fbdev;
}
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