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