ESPTerm - ESP8266 terminal emulator. Branches: [master] patches, [work] next release
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espterm-firmware/user/screen.c

940 lines
17 KiB

#include <esp8266.h>
#include <httpd.h>
#include "screen.h"
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#include "persist.h"
//region Data structures
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TerminalConfigBundle * const termconf = &persist.current.termconf;
TerminalConfigBundle termconf_scratch;
#define W termconf_scratch.width
#define H termconf_scratch.height
/**
* Restore hard defaults
*/
void terminal_restore_defaults(void)
{
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termconf->default_bg = 0;
termconf->default_fg = 7;
termconf->width = 26;
termconf->height = 10;
termconf->parser_tout_ms = 10;
sprintf(termconf->title, "ESPTerm");
for(int i=1; i <= 5; i++) {
sprintf(termconf->btn[i-1], "%d", i);
}
}
/**
* Apply settings after eg. restore from defaults
*/
void terminal_apply_settings(void)
{
terminal_apply_settings_noclear();
screen_init();
}
void terminal_apply_settings_noclear(void)
{
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memcpy(&termconf_scratch, termconf, sizeof(TerminalConfigBundle));
if (W*H >= MAX_SCREEN_SIZE) {
error("BAD SCREEN SIZE: %d rows x %d cols", H, W);
error("reverting terminal settings to default");
terminal_restore_defaults();
persist_store();
memcpy(&termconf_scratch, termconf, sizeof(TerminalConfigBundle));
screen_init();
}
}
/**
* Highest permissible value of the color attribute
*/
#define COLOR_MAX 15
/**
* Screen cell data type (16 bits)
*/
typedef struct __attribute__((packed)){
char c[4]; // space for a full unicode character
Color fg : 4;
Color bg : 4;
bool bold : 1;
} Cell;
/**
* The screen data array
*/
static Cell screen[MAX_SCREEN_SIZE];
/**
* Cursor position and attributes
*/
static struct {
int x; //!< X coordinate
int y; //!< Y coordinate
bool visible; //!< Visible
bool inverse; //!< Inverse colors
bool autowrap; //!< Wrapping when EOL
bool bold; //!< Bold style
Color fg; //!< Foreground color for writing
Color bg; //!< Background color for writing
} cursor;
/**
* Saved cursor position, used with the SCP RCP commands
*/
static struct {
int x;
int y;
// optionally saved attrs
bool withAttrs;
bool inverse;
Color fg;
Color bg;
} cursor_sav;
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// XXX volatile is probably not needed
static volatile int notifyLock = 0;
//endregion
//region Helpers
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#define NOTIFY_LOCK() do { \
notifyLock++; \
} while(0)
#define NOTIFY_DONE() do { \
if (notifyLock > 0) notifyLock--; \
if (notifyLock == 0) screen_notifyChange(CHANGE_CONTENT); \
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} while(0)
/**
* Clear range, inclusive
*/
static inline void
clear_range(unsigned int from, unsigned int to)
{
if (to >= W*H) to = W*H-1;
Color fg = cursor.inverse ? cursor.bg : cursor.fg;
Color bg = cursor.inverse ? cursor.fg : cursor.bg;
Cell sample;
sample.c[0] = ' ';
sample.c[1] = 0;
sample.c[2] = 0;
sample.c[3] = 0;
sample.fg = fg;
sample.bg = bg;
sample.bold = false;
for (unsigned int i = from; i <= to; i++) {
memcpy(&screen[i], &sample, sizeof(Cell));
}
}
/**
* Reset the cursor position & colors
*/
static void ICACHE_FLASH_ATTR
cursor_reset(void)
{
cursor.x = 0;
cursor.y = 0;
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cursor.fg = termconf_scratch.default_fg;
cursor.bg = termconf_scratch.default_bg;
cursor.visible = 1;
cursor.inverse = 0;
cursor.autowrap = 1;
cursor.bold = 0;
}
//endregion
//region Screen clearing
/**
* Init the screen (entire mappable area - for consistency)
*/
void ICACHE_FLASH_ATTR
screen_init(void)
{
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NOTIFY_LOCK();
screen_reset();
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NOTIFY_DONE();
}
/**
* Reset the screen (only the visible area)
*/
void ICACHE_FLASH_ATTR
screen_reset(void)
{
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NOTIFY_LOCK();
cursor_reset();
screen_clear(CLEAR_ALL);
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NOTIFY_DONE();
}
/**
* Reset the cursor
*/
void ICACHE_FLASH_ATTR
screen_reset_cursor(void)
{
NOTIFY_LOCK();
cursor.fg = termconf_scratch.default_fg;
cursor.bg = termconf_scratch.default_bg;
cursor.inverse = 0;
cursor.bold = 0;
NOTIFY_DONE();
}
/**
* Clear screen area
*/
void ICACHE_FLASH_ATTR
screen_clear(ClearMode mode)
{
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NOTIFY_LOCK();
switch (mode) {
case CLEAR_ALL:
clear_range(0, W * H - 1);
break;
case CLEAR_FROM_CURSOR:
clear_range((cursor.y * W) + cursor.x, W * H - 1);
break;
case CLEAR_TO_CURSOR:
clear_range(0, (cursor.y * W) + cursor.x);
break;
}
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NOTIFY_DONE();
}
/**
* Line reset to gray-on-white, empty
*/
void ICACHE_FLASH_ATTR
screen_clear_line(ClearMode mode)
{
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NOTIFY_LOCK();
switch (mode) {
case CLEAR_ALL:
clear_range(cursor.y * W, (cursor.y + 1) * W - 1);
break;
case CLEAR_FROM_CURSOR:
clear_range(cursor.y * W + cursor.x, (cursor.y + 1) * W - 1);
break;
case CLEAR_TO_CURSOR:
clear_range(cursor.y * W, cursor.y * W + cursor.x);
break;
}
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NOTIFY_DONE();
}
void ICACHE_FLASH_ATTR
screen_clear_in_line(unsigned int count)
{
if (cursor.x + count >= W) {
screen_clear_line(CLEAR_FROM_CURSOR);
}
else {
NOTIFY_LOCK();
clear_range(cursor.y * W + cursor.x, cursor.y * W + cursor.x + count - 1);
NOTIFY_DONE();
}
}
void ICACHE_FLASH_ATTR
screen_fill_with_E(void)
{
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NOTIFY_LOCK();
Cell sample;
sample.c[0] = 'E';
sample.c[1] = 0;
sample.c[2] = 0;
sample.c[3] = 0;
sample.fg = termconf_scratch.default_fg;
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sample.bg = termconf_scratch.default_bg;
sample.bold = false;
for (unsigned int i = 0; i <= W*H-1; i++) {
memcpy(&screen[i], &sample, sizeof(Cell));
}
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NOTIFY_DONE();
}
//endregion
//region Screen manipulation
void screen_insert_lines(unsigned int lines)
{
NOTIFY_LOCK();
// shift the following lines
int targetStart = cursor.y + lines;
if (targetStart >= H) {
targetStart = H;
} else {
// do the moving
for (int i = H-1; i >= targetStart; i--) {
memcpy(screen+i*W, screen+(i-lines)*W, sizeof(Cell)*W);
}
}
// clear the first line
screen_clear_line(CLEAR_ALL);
// copy it to the rest of the cleared region
for (int i = cursor.y+1; i < targetStart; i++) {
memcpy(screen+i*W, screen+cursor.y*W, sizeof(Cell)*W);
}
NOTIFY_DONE();
}
void screen_delete_lines(unsigned int lines)
{
NOTIFY_LOCK();
// shift lines up
int targetEnd = H - 1 - lines;
if (targetEnd <= cursor.y) {
targetEnd = cursor.y;
} else {
// do the moving
for (int i = cursor.y; i <= targetEnd; i++) {
memcpy(screen+i*W, screen+(i+lines)*W, sizeof(Cell)*W);
}
}
// clear the rest
clear_range(targetEnd*W, W*H-1);
NOTIFY_DONE();
}
void screen_insert_characters(unsigned int count)
{
NOTIFY_LOCK();
int targetStart = cursor.x + count;
if (targetStart >= W) {
targetStart = W-1;
} else {
// do the moving
for (int i = W-1; i >= targetStart; i--) {
memcpy(screen+cursor.y*W+i, screen+cursor.y*W+(i-count), sizeof(Cell));
}
}
clear_range(cursor.y*W+cursor.x, cursor.y*W+targetStart-1);
NOTIFY_DONE();
}
void screen_delete_characters(unsigned int count)
{
NOTIFY_LOCK();
int targetEnd = W - count;
if (targetEnd > cursor.x) {
// do the moving
for (int i = cursor.x; i <= targetEnd; i++) {
memcpy(screen+cursor.y*W+i, screen+cursor.y*W+(i+count), sizeof(Cell));
}
}
if (targetEnd <= cursor.x) {
screen_clear_line(CLEAR_FROM_CURSOR);
}
else {
clear_range(cursor.y * W + (W - count), (cursor.y + 1) * W - 1);
}
NOTIFY_DONE();
}
/**
* Change the screen size
*
* @param cols - new width
* @param rows - new height
*/
void ICACHE_FLASH_ATTR
screen_resize(int rows, int cols)
{
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NOTIFY_LOCK();
// sanitize
if (cols < 1 || rows < 1) {
error("Screen size must be positive");
goto done;
}
if (cols * rows > MAX_SCREEN_SIZE) {
error("Max screen size exceeded");
goto done;
}
W = cols;
H = rows;
screen_reset();
done:
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NOTIFY_DONE();
}
/**
* Shift screen upwards
*/
void ICACHE_FLASH_ATTR
screen_scroll_up(unsigned int lines)
{
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NOTIFY_LOCK();
if (lines >= H - 1) {
screen_clear(CLEAR_ALL);
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goto done;
}
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// bad cmd
if (lines == 0) {
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goto done;
}
int y;
for (y = 0; y < H - lines; y++) {
memcpy(screen + y * W, screen + (y + lines) * W, W * sizeof(Cell));
}
clear_range(y * W, W * H - 1);
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done:
NOTIFY_DONE();
}
/**
* Shift screen downwards
*/
void ICACHE_FLASH_ATTR
screen_scroll_down(unsigned int lines)
{
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NOTIFY_LOCK();
if (lines >= H - 1) {
screen_clear(CLEAR_ALL);
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goto done;
}
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// bad cmd
if (lines == 0) {
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goto done;
}
int y;
for (y = H-1; y >= lines; y--) {
memcpy(screen + y * W, screen + (y - lines) * W, W * sizeof(Cell));
}
clear_range(0, lines * W-1);
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done:
NOTIFY_DONE();
}
//endregion
//region Cursor manipulation
/**
* Set cursor position
*/
void ICACHE_FLASH_ATTR
screen_cursor_set(int y, int x)
{
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NOTIFY_LOCK();
if (x >= W) x = W - 1;
if (y >= H) y = H - 1;
cursor.x = x;
cursor.y = y;
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NOTIFY_DONE();
}
/**
* Set cursor position
*/
void ICACHE_FLASH_ATTR
screen_cursor_get(int *y, int *x)
{
*x = cursor.x;
*y = cursor.y;
}
/**
* Set cursor X position
*/
void ICACHE_FLASH_ATTR
screen_cursor_set_x(int x)
{
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NOTIFY_LOCK();
if (x >= W) x = W - 1;
cursor.x = x;
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NOTIFY_DONE();
}
/**
* Set cursor Y position
*/
void ICACHE_FLASH_ATTR
screen_cursor_set_y(int y)
{
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NOTIFY_LOCK();
if (y >= H) y = H - 1;
cursor.y = y;
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NOTIFY_DONE();
}
/**
* Relative cursor move
*/
void ICACHE_FLASH_ATTR
screen_cursor_move(int dy, int dx, bool scroll)
{
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NOTIFY_LOCK();
int move;
cursor.x += dx;
cursor.y += dy;
if (cursor.x >= (int)W) cursor.x = W - 1;
if (cursor.x < (int)0) cursor.x = 0;
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if (cursor.y < 0) {
move = -cursor.y;
cursor.y = 0;
if (scroll) screen_scroll_down((unsigned int)move);
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}
if (cursor.y >= H) {
move = cursor.y - (H - 1);
cursor.y = H - 1;
if (scroll) screen_scroll_up((unsigned int)move);
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}
NOTIFY_DONE();
}
/**
* Save the cursor pos
*/
void ICACHE_FLASH_ATTR
screen_cursor_save(bool withAttrs)
{
cursor_sav.x = cursor.x;
cursor_sav.y = cursor.y;
cursor_sav.withAttrs = withAttrs;
if (withAttrs) {
cursor_sav.fg = cursor.fg;
cursor_sav.bg = cursor.bg;
cursor_sav.inverse = cursor.inverse;
} else {
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cursor_sav.fg = termconf_scratch.default_fg;
cursor_sav.bg = termconf_scratch.default_bg;
cursor_sav.inverse = 0;
}
}
/**
* Restore the cursor pos
*/
void ICACHE_FLASH_ATTR
screen_cursor_restore(bool withAttrs)
{
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NOTIFY_LOCK();
cursor.x = cursor_sav.x;
cursor.y = cursor_sav.y;
if (withAttrs) {
cursor.fg = cursor_sav.fg;
cursor.bg = cursor_sav.bg;
cursor.inverse = cursor_sav.inverse;
}
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NOTIFY_DONE();
}
/**
* Enable cursor display
*/
void ICACHE_FLASH_ATTR
screen_cursor_enable(bool enable)
{
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NOTIFY_LOCK();
cursor.visible = enable;
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NOTIFY_DONE();
}
/**
* Enable autowrap
*/
void ICACHE_FLASH_ATTR
screen_wrap_enable(bool enable)
{
NOTIFY_LOCK();
cursor.autowrap = enable;
NOTIFY_DONE();
}
//endregion
//region Colors
/**
* Set cursor foreground color
*/
void ICACHE_FLASH_ATTR
screen_set_fg(Color color)
{
if (color > COLOR_MAX) color = COLOR_MAX;
cursor.fg = color;
}
/**
* Set cursor background coloor
*/
void ICACHE_FLASH_ATTR
screen_set_bg(Color color)
{
if (color > COLOR_MAX) color = COLOR_MAX;
cursor.bg = color;
}
/**
* Set cursor foreground and background color
*/
void ICACHE_FLASH_ATTR
screen_set_colors(Color fg, Color bg)
{
screen_set_fg(fg);
screen_set_bg(bg);
}
/**
* Invert colors
*/
void ICACHE_FLASH_ATTR
screen_inverse(bool inverse)
{
cursor.inverse = inverse;
}
/**
* Make foreground bright.
*
* This relates to the '1' SGR command which originally means
* "bold font". We interpret that as "Bright", similar to other
* terminal emulators.
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*
* Note that the bright colors can be used without bold using the 90+ codes
*/
void ICACHE_FLASH_ATTR
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screen_set_bold(bool bold)
{
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if (!bold) {
cursor.fg = (Color) (cursor.fg % 8);
} else {
cursor.fg = (Color) ((cursor.fg % 8) + 8); // change anything to the bright colors
}
cursor.bold = bold;
}
//endregion
/**
* Check if coords are in range
*
* @param y
* @param x
* @return OK
*/
bool ICACHE_FLASH_ATTR screen_isCoordValid(int y, int x)
{
return x >= 0 && y >= 0 && x < W && y < H;
}
/**
* Set a character in the cursor color, move to right with wrap.
*/
void ICACHE_FLASH_ATTR
screen_putchar(const char *ch)
{
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NOTIFY_LOCK();
Cell *c = &screen[cursor.x + cursor.y * W];
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// Special treatment for CRLF
switch (ch[0]) {
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case '\r':
screen_cursor_set_x(0);
goto done;
case '\n':
screen_cursor_move(1, 0, true); // can scroll
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goto done;
case 8: // BS
if (cursor.x > 0) {
cursor.x--;
} else {
// wrap around start of line
if (cursor.autowrap && cursor.y>0) {
cursor.x=W-1;
cursor.y--;
}
}
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// erase target cell
c = &screen[cursor.x + cursor.y * W];
c->c[0] = ' ';
c->c[1] = 0;
c->c[2] = 0;
c->c[3] = 0;
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goto done;
case 9: // TAB
if (cursor.x<((W-1)-(W-1)%4)) {
c->c[0] = ' ';
c->c[1] = 0;
c->c[2] = 0;
c->c[3] = 0;
do {
screen_putchar(" ");
} while(cursor.x%4!=0);
}
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goto done;
default:
if (ch[0] < ' ') {
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// Discard
warn("Ignoring control char %d", (int)ch);
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goto done;
}
}
// copy unicode char
strncpy(c->c, ch, 4);
if (cursor.inverse) {
c->fg = cursor.bg;
c->bg = cursor.fg;
} else {
c->fg = cursor.fg;
c->bg = cursor.bg;
}
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c->bold = cursor.bold;
cursor.x++;
// X wrap
if (cursor.x >= W) {
if (cursor.autowrap) {
cursor.x = 0;
cursor.y++;
// Y wrap
if (cursor.y > H - 1) {
// Scroll up, so we have space for writing
screen_scroll_up(1);
cursor.y = H - 1;
}
} else {
cursor.x = W - 1;
}
}
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done:
NOTIFY_DONE();
}
//region Serialization
#if 0
/**
* Debug dump
*/
void screen_dd(void)
{
for (int y = 0; y < H; y++) {
for (int x = 0; x < W; x++) {
Cell *cell = &screen[y * W + x];
// FG
printf("\033[");
if (cell->fg > 7) {
printf("%d", 90 + cell->fg - 8);
} else {
printf("%d", 30 + cell->fg);
}
printf("m");
// BG
printf("\033[");
if (cell->bg > 7) {
printf("%d", 100 + cell->bg - 8);
} else {
printf("%d", 40 + cell->bg);
}
printf("m");
printf("%c", cell->c);
}
printf("\033[0m\n");
}
}
#endif
struct ScreenSerializeState {
Color lastFg;
Color lastBg;
bool lastBold;
char lastChar[4];
int index;
};
void ICACHE_FLASH_ATTR
encode2B(u16 number, WordB2 *stru)
{
stru->lsb = (u8) (number % 127);
stru->msb = (u8) ((number - stru->lsb) / 127 + 1);
stru->lsb += 1;
}
/**
* buffer should be at least 64+5*10+6 long (title + buttons + 6), ie. 120
* @param buffer
* @param buf_len
*/
void ICACHE_FLASH_ATTR
screenSerializeLabelsToBuffer(char *buffer, size_t buf_len)
{
// let's just assume it's long enough - called with the huge websocket buffer
sprintf(buffer, "T%s\x01%s\x01%s\x01%s\x01%s\x01%s", // use 0x01 as separator
termconf_scratch.title,
termconf_scratch.btn[0],
termconf_scratch.btn[1],
termconf_scratch.btn[2],
termconf_scratch.btn[3],
termconf_scratch.btn[4]
);
}
/**
* Serialize the screen to a data buffer. May need multiple calls if the buffer is insufficient in size.
*
* @warning MAKE SURE *DATA IS NULL BEFORE FIRST CALL!
* Call with NULL 'buffer' at the end to free the data struct.
*
* @param buffer - buffer array of limited size. If NULL, indicates this is the last call.
* @param buf_len - buffer array size
* @param data - opaque pointer to internal data structure for storing state between repeated calls
* if NULL, indicates this is the first call.
* @return HTTPD_CGI_DONE or HTTPD_CGI_MORE. If more, repeat with the same DATA.
*/
httpd_cgi_state ICACHE_FLASH_ATTR
screenSerializeToBuffer(char *buffer, size_t buf_len, void **data)
{
struct ScreenSerializeState *ss = *data;
if (buffer == NULL) {
if (ss != NULL) free(ss);
return HTTPD_CGI_DONE;
}
Cell *cell, *cell0;
WordB2 w1, w2, w3, w4, w5;
size_t remain = buf_len; int used = 0;
char *bb = buffer;
// Ideally we'd use snprintf here!
#define bufprint(fmt, ...) do { \
used = sprintf(bb, fmt, ##__VA_ARGS__); \
if(used>0) { bb += used; remain -= used; } \
} while(0)
if (ss == NULL) {
*data = ss = malloc(sizeof(struct ScreenSerializeState));
ss->index = 0;
ss->lastBg = 0;
ss->lastFg = 0;
ss->lastBold = false;
memset(ss->lastChar, 0, 4); // this ensures the first char is never "repeat"
encode2B((u16) H, &w1);
encode2B((u16) W, &w2);
encode2B((u16) cursor.y, &w3);
encode2B((u16) cursor.x, &w4);
encode2B((u16) (
cursor.fg |
(cursor.bg<<4) |
(cursor.bold?0x100:0) |
(cursor.visible?0x200:0))
, &w5);
// H W X Y Attribs
bufprint("S%c%c%c%c%c%c%c%c%c%c", w1.lsb, w1.msb, w2.lsb, w2.msb, w3.lsb, w3.msb, w4.lsb, w4.msb, w5.lsb, w5.msb);
}
int i = ss->index;
while(i < W*H && remain > 12) {
cell = cell0 = &screen[i];
// Count how many times same as previous
int repCnt = 0;
while (i < W*H
&& cell->fg == ss->lastFg
&& cell->bg == ss->lastBg
&& cell->bold == ss->lastBold
&& strneq(cell->c, ss->lastChar, 4)) {
// Repeat
repCnt++;
cell = &screen[++i];
}
if (repCnt == 0) {
// No repeat
if (cell0->bold != ss->lastBold || cell0->fg != ss->lastFg || cell0->bg != ss->lastBg) {
encode2B((u16) (
cell0->fg |
(cell0->bg<<4) |
(cell0->bold?0x100:0))
, &w1);
bufprint("\x01%c%c", w1.lsb, w1.msb);
}
// copy the symbol, until first 0 or reached 4 bytes
char c;
int j = 0;
while ((c = cell->c[j++]) != 0 && j < 4) {
bufprint("%c", c);
}
ss->lastFg = cell0->fg;
ss->lastBg = cell0->bg;
ss->lastBold = cell0->bold;
memcpy(ss->lastChar, cell0->c, 4);
i++;
} else {
// Repeat count
encode2B((u16) repCnt, &w1);
bufprint("\x02%c%c", w1.lsb, w1.msb);
}
}
ss->index = i;
if (i < W*H-1) {
return HTTPD_CGI_MORE;
}
return HTTPD_CGI_DONE;
}
//endregion