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695 lines
11 KiB
695 lines
11 KiB
#include <esp8266.h>
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#include <httpd.h>
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#include "screen.h"
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//region Data structures
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/**
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* Highest permissible value of the color attribute
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*/
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#define COLOR_MAX 15
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/**
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* Screen cell data type (16 bits)
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*/
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typedef struct __attribute__((packed)){
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char c : 8;
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Color fg : 4;
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Color bg : 4;
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} Cell;
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/**
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* The screen data array
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*/
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static Cell screen[MAX_SCREEN_SIZE];
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/**
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* Cursor position and attributes
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*/
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static struct {
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int x; //!< X coordinate
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int y; //!< Y coordinate
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bool visible; //!< Visible
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bool inverse; //!< Inverse colors
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Color fg; //!< Foreground color for writing
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Color bg; //!< Background color for writing
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} cursor;
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/**
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* Saved cursor position, used with the SCP RCP commands
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*/
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static struct {
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int x;
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int y;
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} cursor_sav;
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/**
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* Active screen width
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*/
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static int W = SCREEN_DEF_W;
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/**
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* Active screen height
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*/
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static int H = SCREEN_DEF_H;
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// XXX volatile is probably not needed
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static volatile int notifyLock = 0;
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//endregion
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//region Helpers
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#define NOTIFY_LOCK() do { \
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notifyLock++; \
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} while(0)
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#define NOTIFY_DONE() do { \
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if (notifyLock > 0) notifyLock--; \
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if (notifyLock == 0) screen_notifyChange(); \
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} while(0)
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/**
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* Reset a cell
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*/
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static inline void
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cell_init(Cell *cell)
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{
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cell->c = ' ';
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cell->fg = SCREEN_DEF_FG;
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cell->bg = SCREEN_DEF_BG;
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}
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/**
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* Clear range, inclusive
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*/
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static inline void
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clear_range(unsigned int from, unsigned int to)
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{
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for (unsigned int i = from; i <= to; i++) {
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cell_init(&screen[i]);
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}
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}
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/**
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* Reset the cursor position & colors
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*/
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static void ICACHE_FLASH_ATTR
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cursor_reset(void)
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{
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cursor.x = 0;
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cursor.y = 0;
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cursor.fg = SCREEN_DEF_FG;
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cursor.bg = SCREEN_DEF_BG;
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cursor.visible = 1;
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cursor.inverse = 0;
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}
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//endregion
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//region Screen clearing
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/**
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* Init the screen (entire mappable area - for consistency)
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*/
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void ICACHE_FLASH_ATTR
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screen_init(void)
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{
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NOTIFY_LOCK();
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for (unsigned int i = 0; i < MAX_SCREEN_SIZE; i++) {
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cell_init(&screen[i]);
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}
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cursor_reset();
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NOTIFY_DONE();
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}
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/**
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* Reset the screen (only the visible area)
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*/
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void ICACHE_FLASH_ATTR
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screen_reset(void)
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{
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NOTIFY_LOCK();
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screen_clear(CLEAR_ALL);
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cursor_reset();
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NOTIFY_DONE();
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}
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/**
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* Clear screen area
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*/
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void ICACHE_FLASH_ATTR
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screen_clear(ClearMode mode)
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{
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NOTIFY_LOCK();
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switch (mode) {
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case CLEAR_ALL:
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clear_range(0, W * H - 1);
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break;
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case CLEAR_FROM_CURSOR:
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clear_range((cursor.y * W) + cursor.x, W * H - 1);
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break;
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case CLEAR_TO_CURSOR:
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clear_range(0, (cursor.y * W) + cursor.x);
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break;
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}
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NOTIFY_DONE();
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}
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/**
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* Line reset to gray-on-white, empty
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*/
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void ICACHE_FLASH_ATTR
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screen_clear_line(ClearMode mode)
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{
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NOTIFY_LOCK();
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switch (mode) {
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case CLEAR_ALL:
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clear_range(cursor.y * W, (cursor.y + 1) * W - 1);
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break;
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case CLEAR_FROM_CURSOR:
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clear_range(cursor.y * W + cursor.x, (cursor.y + 1) * W - 1);
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break;
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case CLEAR_TO_CURSOR:
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clear_range(cursor.y * W, cursor.y * W + cursor.x);
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break;
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}
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NOTIFY_DONE();
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}
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//endregion
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//region Screen manipulation
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/**
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* Change the screen size
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*
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* @param cols - new width
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* @param rows - new height
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*/
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void ICACHE_FLASH_ATTR
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screen_resize(int rows, int cols)
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{
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NOTIFY_LOCK();
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// sanitize
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if (cols < 1 || rows < 1) {
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error("Screen size must be positive");
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goto done;
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}
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if (cols * rows > MAX_SCREEN_SIZE) {
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error("Max screen size exceeded");
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goto done;
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}
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W = cols;
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H = rows;
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screen_reset();
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done:
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NOTIFY_DONE();
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}
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/**
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* Shift screen upwards
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*/
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void ICACHE_FLASH_ATTR
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screen_scroll_up(unsigned int lines)
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{
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NOTIFY_LOCK();
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if (lines >= H - 1) {
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screen_clear(CLEAR_ALL);
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goto done;
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}
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// bad cmd
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if (lines == 0) {
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goto done;
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}
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int y;
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for (y = 0; y < H - lines; y++) {
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memcpy(screen + y * W, screen + (y + lines) * W, W * sizeof(Cell));
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}
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clear_range(y * W, W * H - 1);
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done:
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NOTIFY_DONE();
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}
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/**
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* Shift screen downwards
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*/
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void ICACHE_FLASH_ATTR
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screen_scroll_down(unsigned int lines)
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{
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NOTIFY_LOCK();
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if (lines >= H - 1) {
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screen_clear(CLEAR_ALL);
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goto done;
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}
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// bad cmd
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if (lines == 0) {
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goto done;
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}
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int y;
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for (y = H-1; y >= lines; y--) {
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memcpy(screen + y * W, screen + (y - lines) * W, W * sizeof(Cell));
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}
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clear_range(0, lines * W-1);
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done:
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NOTIFY_DONE();
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}
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//endregion
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//region Cursor manipulation
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/**
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* Set cursor position
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_set(int y, int x)
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{
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NOTIFY_LOCK();
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if (x >= W) x = W - 1;
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if (y >= H) y = H - 1;
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cursor.x = x;
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cursor.y = y;
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NOTIFY_DONE();
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}
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/**
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* Set cursor position
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_get(int *y, int *x)
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{
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*x = cursor.x;
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*y = cursor.y;
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}
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/**
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* Set cursor X position
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_set_x(int x)
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{
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NOTIFY_LOCK();
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if (x >= W) x = W - 1;
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cursor.x = x;
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NOTIFY_DONE();
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}
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/**
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* Set cursor Y position
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_set_y(int y)
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{
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NOTIFY_LOCK();
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if (y >= H) y = H - 1;
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cursor.y = y;
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NOTIFY_DONE();
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}
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/**
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* Relative cursor move
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_move(int dy, int dx)
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{
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NOTIFY_LOCK();
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int move;
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cursor.x += dx;
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cursor.y += dy;
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if (cursor.x >= W) cursor.x = W - 1;
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if (cursor.x < 0) cursor.x = 0;
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if (cursor.y < 0) {
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move = -cursor.y;
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cursor.y = 0;
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screen_scroll_down((unsigned int)move);
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}
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if (cursor.y >= H) {
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move = cursor.y - (H - 1);
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cursor.y = H - 1;
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screen_scroll_up((unsigned int)move);
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}
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NOTIFY_DONE();
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}
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/**
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* Save the cursor pos
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_save(void)
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{
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cursor_sav.x = cursor.x;
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cursor_sav.y = cursor.y;
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}
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/**
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* Restore the cursor pos
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_restore(void)
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{
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NOTIFY_LOCK();
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cursor.x = cursor_sav.x;
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cursor.y = cursor_sav.y;
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NOTIFY_DONE();
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}
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/**
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* Enable cursor display
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*/
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void ICACHE_FLASH_ATTR
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screen_cursor_enable(bool enable)
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{
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NOTIFY_LOCK();
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cursor.visible = enable;
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NOTIFY_DONE();
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}
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//endregion
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//region Colors
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/**
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* Set cursor foreground color
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*/
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void ICACHE_FLASH_ATTR
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screen_set_fg(Color color)
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{
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if (color > COLOR_MAX) color = COLOR_MAX;
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cursor.fg = color;
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}
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/**
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* Set cursor background coloor
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*/
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void ICACHE_FLASH_ATTR
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screen_set_bg(Color color)
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{
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if (color > COLOR_MAX) color = COLOR_MAX;
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cursor.bg = color;
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}
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/**
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* Set cursor foreground and background color
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*/
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void ICACHE_FLASH_ATTR
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screen_set_colors(Color fg, Color bg)
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{
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screen_set_fg(fg);
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screen_set_bg(bg);
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}
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/**
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* Invert colors
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*/
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void ICACHE_FLASH_ATTR
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screen_inverse(bool inverse)
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{
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cursor.inverse = inverse;
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}
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/**
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* Make foreground bright.
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*
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* This relates to the '1' SGR command which originally means
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* "bold font". We interpret that as "Bright", similar to other
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* terminal emulators.
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*/
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void ICACHE_FLASH_ATTR
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screen_set_bright_fg(void)
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{
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cursor.fg = (cursor.fg % 8) + 8;
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}
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//endregion
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/**
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* Check if coords are in range
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*
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* @param y
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* @param x
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* @return OK
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*/
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bool ICACHE_FLASH_ATTR screen_isCoordValid(int y, int x)
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{
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return x >= 0 && y >= 0 && x < W && y < H;
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}
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/**
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* Set a character in the cursor color, move to right with wrap.
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*/
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void ICACHE_FLASH_ATTR
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screen_putchar(char ch)
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{
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NOTIFY_LOCK();
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Cell *c = &screen[cursor.x + cursor.y * W];
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// Special treatment for CRLF
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switch (ch) {
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case '\r':
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screen_cursor_set_x(0);
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goto done;
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case '\n':
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screen_cursor_move(1, 0);
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goto done;
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case 8: // BS
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if (cursor.x > 0) {
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cursor.x--;
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} else {
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// wrap around start of line
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if (cursor.y>0) {
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cursor.x=W-1;
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cursor.y--;
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}
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}
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// erase target cell
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c = &screen[cursor.x + cursor.y * W];
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c->c = ' ';
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goto done;
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case 9: // TAB
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if (cursor.x<((W-1)-(W-1)%4)) {
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c->c = ' ';
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do {
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screen_putchar(' ');
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} while(cursor.x%4!=0);
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}
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goto done;
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default:
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if (ch < ' ') {
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// Discard
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warn("Ignoring control char %d", (int)ch);
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goto done;
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}
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}
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c->c = ch;
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if (cursor.inverse) {
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c->fg = cursor.bg;
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c->bg = cursor.fg;
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} else {
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c->fg = cursor.fg;
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c->bg = cursor.bg;
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}
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cursor.x++;
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// X wrap
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if (cursor.x >= W) {
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cursor.x = 0;
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cursor.y++;
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// Y wrap
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if (cursor.y > H-1) {
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// Scroll up, so we have space for writing
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screen_scroll_up(1);
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cursor.y = H-1;
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}
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}
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done:
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NOTIFY_DONE();
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}
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//region Serialization
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#if 0
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/**
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* Debug dump
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*/
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void screen_dd(void)
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{
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for (int y = 0; y < H; y++) {
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for (int x = 0; x < W; x++) {
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Cell *cell = &screen[y * W + x];
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// FG
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printf("\033[");
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if (cell->fg > 7) {
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printf("%d", 90 + cell->fg - 8);
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} else {
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printf("%d", 30 + cell->fg);
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}
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printf("m");
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// BG
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printf("\033[");
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if (cell->bg > 7) {
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printf("%d", 100 + cell->bg - 8);
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} else {
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printf("%d", 40 + cell->bg);
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}
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printf("m");
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printf("%c", cell->c);
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}
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printf("\033[0m\n");
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}
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}
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#endif
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struct ScreenSerializeState {
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Color lastFg;
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Color lastBg;
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char lastChar;
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int index;
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};
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/**
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* Serialize the screen to a data buffer. May need multiple calls if the buffer is insufficient in size.
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*
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* @warning MAKE SURE *DATA IS NULL BEFORE FIRST CALL!
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* Call with NULL 'buffer' at the end to free the data struct.
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*
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* @param buffer - buffer array of limited size. If NULL, indicates this is the last call.
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* @param buf_len - buffer array size
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* @param data - opaque pointer to internal data structure for storing state between repeated calls
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* if NULL, indicates this is the first call.
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* @return HTTPD_CGI_DONE or HTTPD_CGI_MORE. If more, repeat with the same DATA.
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*/
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httpd_cgi_state ICACHE_FLASH_ATTR
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screenSerializeToBuffer(char *buffer, size_t buf_len, void **data)
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{
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struct ScreenSerializeState *ss = *data;
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if (buffer == NULL) {
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if (ss != NULL) free(ss);
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return HTTPD_CGI_DONE;
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}
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Cell *cell, *cell0;
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size_t remain = buf_len; int used = 0;
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char *bb = buffer;
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// Ideally we'd use snprintf here!
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#define bufprint(fmt, ...) do { \
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used = sprintf(bb, fmt, ##__VA_ARGS__); \
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if(used>0) { bb += used; remain -= used; } \
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} while(0)
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if (ss == NULL) {
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*data = ss = malloc(sizeof(struct ScreenSerializeState));
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ss->index = 0;
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ss->lastBg = 0;
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ss->lastFg = 0;
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ss->lastChar = '\0';
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bufprint("{\n \"w\": %d, \"h\": %d,\n \"x\": %d, \"y\": %d,\n \"cv\": %d,\n \"screen\": \"", W, H, cursor.x, cursor.y, cursor.visible);
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}
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int i = ss->index;
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while(i < W*H && remain > 12) {
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cell = cell0 = &screen[i];
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|
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// Count how many times same as previous
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int repCnt = 0;
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while (i < W*H
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&& cell->fg == ss->lastFg
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&& cell->bg == ss->lastBg
|
|
&& cell->c == ss->lastChar) {
|
|
// Repeat
|
|
repCnt++;
|
|
cell = &screen[++i];
|
|
}
|
|
|
|
if (repCnt == 0) {
|
|
// All this crap is needed because it's JSON and also
|
|
// embedded in HTML (hence the angle brackets)
|
|
|
|
if (cell0->fg == ss->lastFg && cell0->bg == ss->lastBg) {
|
|
// same colors as previous
|
|
bufprint(",");
|
|
} else {
|
|
bufprint("%X%X", cell0->fg, cell0->bg);
|
|
}
|
|
|
|
char c = cell0->c;
|
|
if (c == '"' || c == '\\') {
|
|
bufprint("\\%c", c);
|
|
}
|
|
else if (c == '<' || c == '>' || c == '\'' || c == '/' || c == '&') {
|
|
bufprint("\\u00%02X", (int)c);
|
|
}
|
|
else {
|
|
bufprint("%c", c);
|
|
}
|
|
|
|
ss->lastFg = cell0->fg;
|
|
ss->lastBg = cell0->bg;
|
|
ss->lastChar = cell0->c;
|
|
|
|
i++;
|
|
} else {
|
|
char code;
|
|
if(repCnt<10) {
|
|
code = 'r';
|
|
} else if(repCnt<100) {
|
|
code = 's';
|
|
} else if(repCnt<1000) {
|
|
code = 't';
|
|
} else {
|
|
code = 'u';
|
|
}
|
|
|
|
bufprint("%c%d", code, repCnt);
|
|
}
|
|
}
|
|
|
|
ss->index = i;
|
|
|
|
if (i < W*H-1) {
|
|
return HTTPD_CGI_MORE;
|
|
}
|
|
|
|
if (remain >= 3) {
|
|
bufprint("\"\n}");
|
|
return HTTPD_CGI_DONE;
|
|
} else {
|
|
return HTTPD_CGI_MORE;
|
|
}
|
|
}
|
|
|
|
//endregion
|
|
|