66dab8f39a
* Make screenshot facility return an Image Returning an image rather than always opennig a new window slightly expands the utility of embedding v86---we may want to take a screenshot and use just its data without asking the user to download it.
562 lines
15 KiB
JavaScript
562 lines
15 KiB
JavaScript
"use strict";
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/**
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* Adapter to use visual screen in browsers (in contrast to node)
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* @constructor
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*
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* @param {BusConnector} bus
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*/
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function ScreenAdapter(screen_container, bus)
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{
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console.assert(screen_container, "1st argument must be a DOM container");
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var
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graphic_screen = screen_container.getElementsByTagName("canvas")[0],
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graphic_context = graphic_screen.getContext("2d", { alpha: false }),
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text_screen = screen_container.getElementsByTagName("div")[0],
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cursor_element = document.createElement("div");
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var
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/** @type {number} */
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cursor_row,
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/** @type {number} */
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cursor_col,
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/** @type {number} */
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scale_x = 1,
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/** @type {number} */
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scale_y = 1,
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base_scale = 1,
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changed_rows,
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// are we in graphical mode now?
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is_graphical = false,
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// Index 0: ASCII code
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// Index 1: Background color
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// Index 2: Foreground color
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text_mode_data,
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// number of columns
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text_mode_width,
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// number of rows
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text_mode_height;
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var stopped = false;
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var screen = this;
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// 0x12345 -> "#012345"
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function number_as_color(n)
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{
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n = n.toString(16);
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return "#" + "0".repeat(6 - n.length) + n;
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}
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/**
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* Charmaps that constraint unicode sequences for the default dospage
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* @const
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*/
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var charmap_high = new Uint16Array([
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0x2302,
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0xC7, 0xFC, 0xE9, 0xE2, 0xE4, 0xE0, 0xE5, 0xE7,
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0xEA, 0xEB, 0xE8, 0xEF, 0xEE, 0xEC, 0xC4, 0xC5,
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0xC9, 0xE6, 0xC6, 0xF4, 0xF6, 0xF2, 0xFB, 0xF9,
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0xFF, 0xD6, 0xDC, 0xA2, 0xA3, 0xA5, 0x20A7, 0x192,
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0xE1, 0xED, 0xF3, 0xFA, 0xF1, 0xD1, 0xAA, 0xBA,
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0xBF, 0x2310, 0xAC, 0xBD, 0xBC, 0xA1, 0xAB, 0xBB,
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0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
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0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,
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0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F,
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0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,
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0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B,
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0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,
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0x3B1, 0xDF, 0x393, 0x3C0, 0x3A3, 0x3C3, 0xB5, 0x3C4,
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0x3A6, 0x398, 0x3A9, 0x3B4, 0x221E, 0x3C6, 0x3B5, 0x2229,
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0x2261, 0xB1, 0x2265, 0x2264, 0x2320, 0x2321, 0xF7,
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0x2248, 0xB0, 0x2219, 0xB7, 0x221A, 0x207F, 0xB2, 0x25A0, 0xA0
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]);
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/** @const */
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var charmap_low = new Uint16Array([
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0x20, 0x263A, 0x263B, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
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0x25D8, 0x25CB, 0x25D9, 0x2642, 0x2640, 0x266A, 0x266B, 0x263C,
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0x25BA, 0x25C4, 0x2195, 0x203C, 0xB6, 0xA7, 0x25AC, 0x21A8,
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0x2191, 0x2193, 0x2192, 0x2190, 0x221F, 0x2194, 0x25B2, 0x25BC
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]);
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var charmap = [],
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chr;
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for(var i = 0; i < 256; i++)
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{
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if(i > 126)
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{
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chr = charmap_high[i - 0x7F];
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}
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else if(i < 32)
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{
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chr = charmap_low[i];
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}
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else
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{
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chr = i;
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}
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charmap[i] = String.fromCharCode(chr);
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}
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graphic_context.imageSmoothingEnabled = false;
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cursor_element.style.position = "absolute";
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cursor_element.style.backgroundColor = "#ccc";
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cursor_element.style.width = "7px";
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cursor_element.style.display = "inline-block";
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text_screen.style.display = "block";
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graphic_screen.style.display = "none";
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this.bus = bus;
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bus.register("screen-set-mode", function(data)
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{
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this.set_mode(data);
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}, this);
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bus.register("screen-fill-buffer-end", function(data)
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{
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this.update_buffer(data);
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}, this);
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bus.register("screen-put-char", function(data)
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{
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//console.log(data);
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this.put_char(data[0], data[1], data[2], data[3], data[4]);
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}, this);
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bus.register("screen-update-cursor", function(data)
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{
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this.update_cursor(data[0], data[1]);
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}, this);
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bus.register("screen-update-cursor-scanline", function(data)
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{
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this.update_cursor_scanline(data[0], data[1]);
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}, this);
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bus.register("screen-clear", function()
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{
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this.clear_screen();
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}, this);
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bus.register("screen-set-size-text", function(data)
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{
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this.set_size_text(data[0], data[1]);
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}, this);
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bus.register("screen-set-size-graphical", function(data)
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{
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this.set_size_graphical(data[0], data[1], data[2], data[3]);
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}, this);
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this.init = function()
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{
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// not necessary, because this gets initialized by the bios early,
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// but nicer to look at
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this.set_size_text(80, 25);
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this.timer();
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};
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this.make_screenshot = function()
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{
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const image = new Image();
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if(is_graphical)
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{
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image.src = graphic_screen.toDataURL("image/png");
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}
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else
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{
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// Default 720x400, but can be [8, 16] at 640x400
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const char_size = [9, 16];
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const canvas = document.createElement("canvas");
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canvas.width = text_mode_width * char_size[0];
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canvas.height = text_mode_height * char_size[1];
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const context = canvas.getContext("2d");
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context.imageSmoothingEnabled = false;
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context.font = window.getComputedStyle(text_screen).font;
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context.textBaseline = "top";
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for(let x = 0; x < text_mode_width; x++)
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{
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for(let y = 0; y < text_mode_height; y++)
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{
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const index = (y * text_mode_width + x) * 3;
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context.fillStyle = number_as_color(text_mode_data[index + 1]);
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context.fillRect(x * char_size[0], y * char_size[1], char_size[0], char_size[1]);
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context.fillStyle = number_as_color(text_mode_data[index + 2]);
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context.fillText(charmap[text_mode_data[index]], x * char_size[0], y * char_size[1]);
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}
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}
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if(cursor_element.style.display !== "none")
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{
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context.fillStyle = cursor_element.style.backgroundColor;
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context.fillRect(
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cursor_col * char_size[0],
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cursor_row * char_size[1] + parseInt(cursor_element.style.marginTop, 10) - 1,
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parseInt(cursor_element.style.width, 10),
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parseInt(cursor_element.style.height, 10)
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);
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}
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image.src = canvas.toDataURL("image/png");
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}
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return image;
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};
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this.put_char = function(row, col, chr, bg_color, fg_color)
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{
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if(row < text_mode_height && col < text_mode_width)
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{
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var p = 3 * (row * text_mode_width + col);
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dbg_assert(chr >= 0 && chr < 0x100);
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text_mode_data[p] = chr;
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text_mode_data[p + 1] = bg_color;
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text_mode_data[p + 2] = fg_color;
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changed_rows[row] = 1;
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}
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};
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this.timer = function()
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{
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if(!stopped)
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{
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requestAnimationFrame(is_graphical ? update_graphical : update_text);
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}
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};
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var update_text = function()
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{
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for(var i = 0; i < text_mode_height; i++)
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{
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if(changed_rows[i])
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{
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screen.text_update_row(i);
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changed_rows[i] = 0;
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}
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}
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this.timer();
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}.bind(this);
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var update_graphical = function()
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{
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this.bus.send("screen-fill-buffer");
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this.timer();
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}.bind(this);
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this.destroy = function()
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{
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stopped = true;
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};
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this.set_mode = function(graphical)
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{
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is_graphical = graphical;
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if(graphical)
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{
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text_screen.style.display = "none";
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graphic_screen.style.display = "block";
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}
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else
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{
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text_screen.style.display = "block";
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graphic_screen.style.display = "none";
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}
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};
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this.clear_screen = function()
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{
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graphic_context.fillStyle = "#000";
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graphic_context.fillRect(0, 0, graphic_screen.width, graphic_screen.height);
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};
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/**
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* @param {number} cols
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* @param {number} rows
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*/
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this.set_size_text = function(cols, rows)
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{
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if(cols === text_mode_width && rows === text_mode_height)
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{
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return;
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}
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changed_rows = new Int8Array(rows);
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text_mode_data = new Int32Array(cols * rows * 3);
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text_mode_width = cols;
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text_mode_height = rows;
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while(text_screen.childNodes.length > rows)
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{
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text_screen.removeChild(text_screen.firstChild);
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}
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while(text_screen.childNodes.length < rows)
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{
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text_screen.appendChild(document.createElement("div"));
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}
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for(var i = 0; i < rows; i++)
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{
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this.text_update_row(i);
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}
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update_scale_text();
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};
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this.set_size_graphical = function(width, height, buffer_width, buffer_height)
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{
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if(DEBUG_SCREEN_LAYERS)
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{
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// Draw the entire buffer. Useful for debugging
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// panning / page flipping / screen splitting code for both
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// v86 developers and os developers
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width = buffer_width;
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height = buffer_height;
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}
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graphic_screen.style.display = "block";
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graphic_screen.width = width;
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graphic_screen.height = height;
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// add some scaling to tiny resolutions
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if(width <= 640 && width * 2 < window.innerWidth && width * 2 < window.innerHeight)
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{
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base_scale = 2;
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}
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else
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{
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base_scale = 1;
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}
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update_scale_graphic();
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};
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this.set_scale = function(s_x, s_y)
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{
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scale_x = s_x;
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scale_y = s_y;
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update_scale_text();
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update_scale_graphic();
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};
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this.set_scale(scale_x, scale_y);
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function update_scale_text()
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{
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elem_set_scale(text_screen, scale_x, scale_y, true);
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}
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function update_scale_graphic()
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{
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elem_set_scale(graphic_screen, scale_x * base_scale, scale_y * base_scale, false);
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}
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function elem_set_scale(elem, scale_x, scale_y, use_scale)
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{
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elem.style.width = "";
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elem.style.height = "";
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if(use_scale)
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{
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elem.style.transform = "";
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}
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var rectangle = elem.getBoundingClientRect();
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if(use_scale)
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{
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var scale_str = "";
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scale_str += scale_x === 1 ? "" : " scaleX(" + scale_x + ")";
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scale_str += scale_y === 1 ? "" : " scaleY(" + scale_y + ")";
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elem.style.transform = scale_str;
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}
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else
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{
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// unblur non-fractional scales
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if(scale_x % 1 === 0 && scale_y % 1 === 0)
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{
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graphic_screen.style["imageRendering"] = "crisp-edges"; // firefox
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graphic_screen.style["imageRendering"] = "pixelated";
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graphic_screen.style["-ms-interpolation-mode"] = "nearest-neighbor";
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}
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else
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{
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graphic_screen.style.imageRendering = "";
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graphic_screen.style["-ms-interpolation-mode"] = "";
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}
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// undo fractional css-to-device pixel ratios
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var device_pixel_ratio = window.devicePixelRatio || 1;
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if(device_pixel_ratio % 1 !== 0)
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{
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scale_x /= device_pixel_ratio;
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scale_y /= device_pixel_ratio;
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}
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}
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if(scale_x !== 1)
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{
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elem.style.width = rectangle.width * scale_x + "px";
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}
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if(scale_y !== 1)
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{
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elem.style.height = rectangle.height * scale_y + "px";
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}
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}
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this.update_cursor_scanline = function(start, end)
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{
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if(start & 0x20)
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{
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cursor_element.style.display = "none";
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}
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else
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{
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cursor_element.style.display = "inline";
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cursor_element.style.height = Math.min(15, end - start) + "px";
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cursor_element.style.marginTop = Math.min(15, start) + "px";
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}
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};
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this.update_cursor = function(row, col)
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{
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if(row !== cursor_row || col !== cursor_col)
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{
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changed_rows[row] = 1;
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changed_rows[cursor_row] = 1;
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cursor_row = row;
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cursor_col = col;
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}
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};
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this.text_update_row = function(row)
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{
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var offset = 3 * row * text_mode_width,
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row_element,
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color_element,
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fragment;
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var bg_color,
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fg_color,
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text;
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row_element = text_screen.childNodes[row];
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fragment = document.createElement("div");
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for(var i = 0; i < text_mode_width; )
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{
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color_element = document.createElement("span");
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bg_color = text_mode_data[offset + 1];
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fg_color = text_mode_data[offset + 2];
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color_element.style.backgroundColor = number_as_color(bg_color);
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color_element.style.color = number_as_color(fg_color);
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text = "";
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// put characters of the same color in one element
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while(i < text_mode_width &&
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text_mode_data[offset + 1] === bg_color &&
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text_mode_data[offset + 2] === fg_color)
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{
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var ascii = text_mode_data[offset];
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text += charmap[ascii];
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dbg_assert(charmap[ascii]);
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i++;
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offset += 3;
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if(row === cursor_row)
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{
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if(i === cursor_col)
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{
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// next row will be cursor
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// create new element
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break;
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}
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else if(i === cursor_col + 1)
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{
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// found the cursor
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fragment.appendChild(cursor_element);
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break;
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}
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}
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}
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color_element.textContent = text;
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fragment.appendChild(color_element);
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}
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row_element.parentNode.replaceChild(fragment, row_element);
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};
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this.update_buffer = function(layers)
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{
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if(DEBUG_SCREEN_LAYERS)
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{
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// For each visible layer that would've been drawn, draw a
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// rectangle to visualise the layer instead.
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graphic_context.strokeStyle = "#0F0";
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graphic_context.lineWidth = 4;
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layers.forEach(layer =>
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{
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graphic_context.strokeRect(
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layer.buffer_x,
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layer.buffer_y,
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layer.buffer_width,
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layer.buffer_height
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);
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});
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graphic_context.lineWidth = 1;
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return;
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}
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layers.forEach(layer =>
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{
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|
graphic_context.putImageData(
|
|
layer.image_data,
|
|
layer.screen_x - layer.buffer_x,
|
|
layer.screen_y - layer.buffer_y,
|
|
layer.buffer_x,
|
|
layer.buffer_y,
|
|
layer.buffer_width,
|
|
layer.buffer_height
|
|
);
|
|
});
|
|
};
|
|
|
|
this.init();
|
|
}
|