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-/*
- * noVNC: HTML5 VNC client
- * Copyright (C) 2011 Joel Martin
- * Licensed under LGPL-3 (see LICENSE.txt)
- *
- * See README.md for usage and integration instructions.
- */
-
-/*jslint browser: true, white: false, bitwise: false */
-/*global Util, Base64, changeCursor */
-
-function Display(defaults) {
-"use strict";
-
-var that = {}, // Public API methods
- conf = {}, // Configuration attributes
-
- // Private Display namespace variables
- c_ctx = null,
- c_forceCanvas = false,
-
- // Predefine function variables (jslint)
- imageDataGet, rgbxImageData, cmapImageData,
- setFillColor, rescale,
-
- // The full frame buffer (logical canvas) size
- fb_width = 0,
- fb_height = 0,
- // The visible "physical canvas" viewport
- viewport = {'x': 0, 'y': 0, 'w' : 0, 'h' : 0 },
- cleanRect = {'x1': 0, 'y1': 0, 'x2': -1, 'y2': -1},
-
- c_prevStyle = "",
- tile = null,
- tile16x16 = null,
- tile_x = 0,
- tile_y = 0;
-
-
-// Configuration attributes
-Util.conf_defaults(conf, that, defaults, [
- ['target', 'wo', 'dom', null, 'Canvas element for rendering'],
- ['context', 'ro', 'raw', null, 'Canvas 2D context for rendering (read-only)'],
- ['logo', 'rw', 'raw', null, 'Logo to display when cleared: {"width": width, "height": height, "data": data}'],
- ['true_color', 'rw', 'bool', true, 'Use true-color pixel data'],
- ['colourMap', 'rw', 'arr', [], 'Colour map array (when not true-color)'],
- ['scale', 'rw', 'float', 1.0, 'Display area scale factor 0.0 - 1.0'],
- ['viewport', 'rw', 'bool', false, 'Use a viewport set with viewportChange()'],
- ['width', 'rw', 'int', null, 'Display area width'],
- ['height', 'rw', 'int', null, 'Display area height'],
-
- ['render_mode', 'ro', 'str', '', 'Canvas rendering mode (read-only)'],
-
- ['prefer_js', 'rw', 'str', null, 'Prefer Javascript over canvas methods'],
- ['cursor_uri', 'rw', 'raw', null, 'Can we render cursor using data URI']
- ]);
-
-// Override some specific getters/setters
-that.get_context = function () { return c_ctx; };
-
-that.set_scale = function(scale) { rescale(scale); };
-
-that.set_width = function (val) { that.resize(val, fb_height); };
-that.get_width = function() { return fb_width; };
-
-that.set_height = function (val) { that.resize(fb_width, val); };
-that.get_height = function() { return fb_height; };
-
-
-
-//
-// Private functions
-//
-
-// Create the public API interface
-function constructor() {
- Util.Debug(">> Display.constructor");
-
- var c, func, i, curDat, curSave,
- has_imageData = false, UE = Util.Engine;
-
- if (! conf.target) { throw("target must be set"); }
-
- if (typeof conf.target === 'string') {
- throw("target must be a DOM element");
- }
-
- c = conf.target;
-
- if (! c.getContext) { throw("no getContext method"); }
-
- if (! c_ctx) { c_ctx = c.getContext('2d'); }
-
- Util.Debug("User Agent: " + navigator.userAgent);
- if (UE.gecko) { Util.Debug("Browser: gecko " + UE.gecko); }
- if (UE.webkit) { Util.Debug("Browser: webkit " + UE.webkit); }
- if (UE.trident) { Util.Debug("Browser: trident " + UE.trident); }
- if (UE.presto) { Util.Debug("Browser: presto " + UE.presto); }
-
- that.clear();
-
- // Check canvas features
- if ('createImageData' in c_ctx) {
- conf.render_mode = "canvas rendering";
- } else {
- throw("Canvas does not support createImageData");
- }
- if (conf.prefer_js === null) {
- Util.Info("Prefering javascript operations");
- conf.prefer_js = true;
- }
-
- // Initialize cached tile imageData
- tile16x16 = c_ctx.createImageData(16, 16);
-
- /*
- * Determine browser support for setting the cursor via data URI
- * scheme
- */
- curDat = [];
- for (i=0; i < 8 * 8 * 4; i += 1) {
- curDat.push(255);
- }
- try {
- curSave = c.style.cursor;
- changeCursor(conf.target, curDat, curDat, 2, 2, 8, 8);
- if (c.style.cursor) {
- if (conf.cursor_uri === null) {
- conf.cursor_uri = true;
- }
- Util.Info("Data URI scheme cursor supported");
- } else {
- if (conf.cursor_uri === null) {
- conf.cursor_uri = false;
- }
- Util.Warn("Data URI scheme cursor not supported");
- }
- c.style.cursor = curSave;
- } catch (exc2) {
- Util.Error("Data URI scheme cursor test exception: " + exc2);
- conf.cursor_uri = false;
- }
-
- Util.Debug("<< Display.constructor");
- return that ;
-}
-
-rescale = function(factor) {
- var c, tp, x, y,
- properties = ['transform', 'WebkitTransform', 'MozTransform', null];
- c = conf.target;
- tp = properties.shift();
- while (tp) {
- if (typeof c.style[tp] !== 'undefined') {
- break;
- }
- tp = properties.shift();
- }
-
- if (tp === null) {
- Util.Debug("No scaling support");
- return;
- }
-
-
- if (typeof(factor) === "undefined") {
- factor = conf.scale;
- } else if (factor > 1.0) {
- factor = 1.0;
- } else if (factor < 0.1) {
- factor = 0.1;
- }
-
- if (conf.scale === factor) {
- //Util.Debug("Display already scaled to '" + factor + "'");
- return;
- }
-
- conf.scale = factor;
- x = c.width - c.width * factor;
- y = c.height - c.height * factor;
- c.style[tp] = "scale(" + conf.scale + ") translate(-" + x + "px, -" + y + "px)";
-};
-
-setFillColor = function(color) {
- var rgb, newStyle;
- if (conf.true_color) {
- rgb = color;
- } else {
- rgb = conf.colourMap[color[0]];
- }
- newStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
- if (newStyle !== c_prevStyle) {
- c_ctx.fillStyle = newStyle;
- c_prevStyle = newStyle;
- }
-};
-
-
-//
-// Public API interface functions
-//
-
-// Shift and/or resize the visible viewport
-that.viewportChange = function(deltaX, deltaY, width, height) {
- var c = conf.target, v = viewport, cr = cleanRect,
- saveImg = null, saveStyle, x1, y1, vx2, vy2, w, h;
-
- if (!conf.viewport) {
- Util.Debug("Setting viewport to full display region");
- deltaX = -v.w; // Clamped later if out of bounds
- deltaY = -v.h; // Clamped later if out of bounds
- width = fb_width;
- height = fb_height;
- }
-
- if (typeof(deltaX) === "undefined") { deltaX = 0; }
- if (typeof(deltaY) === "undefined") { deltaY = 0; }
- if (typeof(width) === "undefined") { width = v.w; }
- if (typeof(height) === "undefined") { height = v.h; }
-
- // Size change
-
- if (width > fb_width) { width = fb_width; }
- if (height > fb_height) { height = fb_height; }
-
- if ((v.w !== width) || (v.h !== height)) {
- // Change width
- if ((width < v.w) && (cr.x2 > v.x + width -1)) {
- cr.x2 = v.x + width - 1;
- }
- v.w = width;
-
- // Change height
- if ((height < v.h) && (cr.y2 > v.y + height -1)) {
- cr.y2 = v.y + height - 1;
- }
- v.h = height;
-
-
- if (v.w > 0 && v.h > 0 && c.width > 0 && c.height > 0) {
- saveImg = c_ctx.getImageData(0, 0,
- (c.width < v.w) ? c.width : v.w,
- (c.height < v.h) ? c.height : v.h);
- }
-
- c.width = v.w;
- c.height = v.h;
-
- if (saveImg) {
- c_ctx.putImageData(saveImg, 0, 0);
- }
- }
-
- vx2 = v.x + v.w - 1;
- vy2 = v.y + v.h - 1;
-
-
- // Position change
-
- if ((deltaX < 0) && ((v.x + deltaX) < 0)) {
- deltaX = - v.x;
- }
- if ((vx2 + deltaX) >= fb_width) {
- deltaX -= ((vx2 + deltaX) - fb_width + 1);
- }
-
- if ((v.y + deltaY) < 0) {
- deltaY = - v.y;
- }
- if ((vy2 + deltaY) >= fb_height) {
- deltaY -= ((vy2 + deltaY) - fb_height + 1);
- }
-
- if ((deltaX === 0) && (deltaY === 0)) {
- //Util.Debug("skipping viewport change");
- return;
- }
- Util.Debug("viewportChange deltaX: " + deltaX + ", deltaY: " + deltaY);
-
- v.x += deltaX;
- vx2 += deltaX;
- v.y += deltaY;
- vy2 += deltaY;
-
- // Update the clean rectangle
- if (v.x > cr.x1) {
- cr.x1 = v.x;
- }
- if (vx2 < cr.x2) {
- cr.x2 = vx2;
- }
- if (v.y > cr.y1) {
- cr.y1 = v.y;
- }
- if (vy2 < cr.y2) {
- cr.y2 = vy2;
- }
-
- if (deltaX < 0) {
- // Shift viewport left, redraw left section
- x1 = 0;
- w = - deltaX;
- } else {
- // Shift viewport right, redraw right section
- x1 = v.w - deltaX;
- w = deltaX;
- }
- if (deltaY < 0) {
- // Shift viewport up, redraw top section
- y1 = 0;
- h = - deltaY;
- } else {
- // Shift viewport down, redraw bottom section
- y1 = v.h - deltaY;
- h = deltaY;
- }
-
- // Copy the valid part of the viewport to the shifted location
- saveStyle = c_ctx.fillStyle;
- c_ctx.fillStyle = "rgb(255,255,255)";
- if (deltaX !== 0) {
- //that.copyImage(0, 0, -deltaX, 0, v.w, v.h);
- //that.fillRect(x1, 0, w, v.h, [255,255,255]);
- c_ctx.drawImage(c, 0, 0, v.w, v.h, -deltaX, 0, v.w, v.h);
- c_ctx.fillRect(x1, 0, w, v.h);
- }
- if (deltaY !== 0) {
- //that.copyImage(0, 0, 0, -deltaY, v.w, v.h);
- //that.fillRect(0, y1, v.w, h, [255,255,255]);
- c_ctx.drawImage(c, 0, 0, v.w, v.h, 0, -deltaY, v.w, v.h);
- c_ctx.fillRect(0, y1, v.w, h);
- }
- c_ctx.fillStyle = saveStyle;
-};
-
-
-// Return a map of clean and dirty areas of the viewport and reset the
-// tracking of clean and dirty areas.
-//
-// Returns: {'cleanBox': {'x': x, 'y': y, 'w': w, 'h': h},
-// 'dirtyBoxes': [{'x': x, 'y': y, 'w': w, 'h': h}, ...]}
-that.getCleanDirtyReset = function() {
- var v = viewport, c = cleanRect, cleanBox, dirtyBoxes = [],
- vx2 = v.x + v.w - 1, vy2 = v.y + v.h - 1;
-
-
- // Copy the cleanRect
- cleanBox = {'x': c.x1, 'y': c.y1,
- 'w': c.x2 - c.x1 + 1, 'h': c.y2 - c.y1 + 1};
-
- if ((c.x1 >= c.x2) || (c.y1 >= c.y2)) {
- // Whole viewport is dirty
- dirtyBoxes.push({'x': v.x, 'y': v.y, 'w': v.w, 'h': v.h});
- } else {
- // Redraw dirty regions
- if (v.x < c.x1) {
- // left side dirty region
- dirtyBoxes.push({'x': v.x, 'y': v.y,
- 'w': c.x1 - v.x + 1, 'h': v.h});
- }
- if (vx2 > c.x2) {
- // right side dirty region
- dirtyBoxes.push({'x': c.x2 + 1, 'y': v.y,
- 'w': vx2 - c.x2, 'h': v.h});
- }
- if (v.y < c.y1) {
- // top/middle dirty region
- dirtyBoxes.push({'x': c.x1, 'y': v.y,
- 'w': c.x2 - c.x1 + 1, 'h': c.y1 - v.y});
- }
- if (vy2 > c.y2) {
- // bottom/middle dirty region
- dirtyBoxes.push({'x': c.x1, 'y': c.y2 + 1,
- 'w': c.x2 - c.x1 + 1, 'h': vy2 - c.y2});
- }
- }
-
- // Reset the cleanRect to the whole viewport
- cleanRect = {'x1': v.x, 'y1': v.y,
- 'x2': v.x + v.w - 1, 'y2': v.y + v.h - 1};
-
- return {'cleanBox': cleanBox, 'dirtyBoxes': dirtyBoxes};
-};
-
-// Translate viewport coordinates to absolute coordinates
-that.absX = function(x) {
- return x + viewport.x;
-}
-that.absY = function(y) {
- return y + viewport.y;
-}
-
-
-that.resize = function(width, height) {
- c_prevStyle = "";
-
- fb_width = width;
- fb_height = height;
-
- rescale(conf.scale);
- that.viewportChange();
-};
-
-that.clear = function() {
-
- if (conf.logo) {
- that.resize(conf.logo.width, conf.logo.height);
- that.blitStringImage(conf.logo.data, 0, 0);
- } else {
- that.resize(640, 20);
- c_ctx.clearRect(0, 0, viewport.w, viewport.h);
- }
-
- // No benefit over default ("source-over") in Chrome and firefox
- //c_ctx.globalCompositeOperation = "copy";
-};
-
-that.fillRect = function(x, y, width, height, color) {
- setFillColor(color);
- c_ctx.fillRect(x - viewport.x, y - viewport.y, width, height);
-};
-
-that.copyImage = function(old_x, old_y, new_x, new_y, w, h) {
- var x1 = old_x - viewport.x, y1 = old_y - viewport.y,
- x2 = new_x - viewport.x, y2 = new_y - viewport.y;
- c_ctx.drawImage(conf.target, x1, y1, w, h, x2, y2, w, h);
-};
-
-
-// Start updating a tile
-that.startTile = function(x, y, width, height, color) {
- var data, rgb, red, green, blue, i;
- tile_x = x;
- tile_y = y;
- if ((width === 16) && (height === 16)) {
- tile = tile16x16;
- } else {
- tile = c_ctx.createImageData(width, height);
- }
- data = tile.data;
- if (conf.prefer_js) {
- if (conf.true_color) {
- rgb = color;
- } else {
- rgb = conf.colourMap[color[0]];
- }
- red = rgb[0];
- green = rgb[1];
- blue = rgb[2];
- for (i = 0; i < (width * height * 4); i+=4) {
- data[i ] = red;
- data[i + 1] = green;
- data[i + 2] = blue;
- data[i + 3] = 255;
- }
- } else {
- that.fillRect(x, y, width, height, color);
- }
-};
-
-// Update sub-rectangle of the current tile
-that.subTile = function(x, y, w, h, color) {
- var data, p, rgb, red, green, blue, width, j, i, xend, yend;
- if (conf.prefer_js) {
- data = tile.data;
- width = tile.width;
- if (conf.true_color) {
- rgb = color;
- } else {
- rgb = conf.colourMap[color[0]];
- }
- red = rgb[0];
- green = rgb[1];
- blue = rgb[2];
- xend = x + w;
- yend = y + h;
- for (j = y; j < yend; j += 1) {
- for (i = x; i < xend; i += 1) {
- p = (i + (j * width) ) * 4;
- data[p ] = red;
- data[p + 1] = green;
- data[p + 2] = blue;
- data[p + 3] = 255;
- }
- }
- } else {
- that.fillRect(tile_x + x, tile_y + y, w, h, color);
- }
-};
-
-// Draw the current tile to the screen
-that.finishTile = function() {
- if (conf.prefer_js) {
- c_ctx.putImageData(tile, tile_x - viewport.x, tile_y - viewport.y)
- }
- // else: No-op, if not prefer_js then already done by setSubTile
-};
-
-rgbxImageData = function(x, y, width, height, arr, offset) {
- var img, i, j, data, v = viewport;
- /*
- if ((x - v.x >= v.w) || (y - v.y >= v.h) ||
- (x - v.x + width < 0) || (y - v.y + height < 0)) {
- // Skipping because outside of viewport
- return;
- }
- */
- img = c_ctx.createImageData(width, height);
- data = img.data;
- for (i=0, j=offset; i < (width * height * 4); i=i+4, j=j+4) {
- data[i ] = arr[j ];
- data[i + 1] = arr[j + 1];
- data[i + 2] = arr[j + 2];
- data[i + 3] = 255; // Set Alpha
- }
- c_ctx.putImageData(img, x - v.x, y - v.y);
-};
-
-cmapImageData = function(x, y, width, height, arr, offset) {
- var img, i, j, data, rgb, cmap;
- img = c_ctx.createImageData(width, height);
- data = img.data;
- cmap = conf.colourMap;
- for (i=0, j=offset; i < (width * height * 4); i+=4, j+=1) {
- rgb = cmap[arr[j]];
- data[i ] = rgb[0];
- data[i + 1] = rgb[1];
- data[i + 2] = rgb[2];
- data[i + 3] = 255; // Set Alpha
- }
- c_ctx.putImageData(img, x - viewport.x, y - viewport.y);
-};
-
-that.blitImage = function(x, y, width, height, arr, offset) {
- if (conf.true_color) {
- rgbxImageData(x, y, width, height, arr, offset);
- } else {
- cmapImageData(x, y, width, height, arr, offset);
- }
-};
-
-that.blitStringImage = function(str, x, y) {
- var img = new Image();
- img.onload = function () {
- c_ctx.drawImage(img, x - viewport.x, y - viewport.y);
- };
- img.src = str;
-};
-
-that.changeCursor = function(pixels, mask, hotx, hoty, w, h) {
- if (conf.cursor_uri === false) {
- Util.Warn("changeCursor called but no cursor data URI support");
- return;
- }
-
- if (conf.true_color) {
- changeCursor(conf.target, pixels, mask, hotx, hoty, w, h);
- } else {
- changeCursor(conf.target, pixels, mask, hotx, hoty, w, h, conf.colourMap);
- }
-};
-
-that.defaultCursor = function() {
- conf.target.style.cursor = "default";
-};
-
-return constructor(); // Return the public API interface
-
-} // End of Display()
-
-
-/* Set CSS cursor property using data URI encoded cursor file */
-function changeCursor(target, pixels, mask, hotx, hoty, w, h, cmap) {
- "use strict";
- var cur = [], rgb, IHDRsz, RGBsz, ANDsz, XORsz, url, idx, alpha, x, y;
- //Util.Debug(">> changeCursor, x: " + hotx + ", y: " + hoty + ", w: " + w + ", h: " + h);
-
- // Push multi-byte little-endian values
- cur.push16le = function (num) {
- this.push((num ) & 0xFF,
- (num >> 8) & 0xFF );
- };
- cur.push32le = function (num) {
- this.push((num ) & 0xFF,
- (num >> 8) & 0xFF,
- (num >> 16) & 0xFF,
- (num >> 24) & 0xFF );
- };
-
- IHDRsz = 40;
- RGBsz = w * h * 4;
- XORsz = Math.ceil( (w * h) / 8.0 );
- ANDsz = Math.ceil( (w * h) / 8.0 );
-
- // Main header
- cur.push16le(0); // 0: Reserved
- cur.push16le(2); // 2: .CUR type
- cur.push16le(1); // 4: Number of images, 1 for non-animated ico
-
- // Cursor #1 header (ICONDIRENTRY)
- cur.push(w); // 6: width
- cur.push(h); // 7: height
- cur.push(0); // 8: colors, 0 -> true-color
- cur.push(0); // 9: reserved
- cur.push16le(hotx); // 10: hotspot x coordinate
- cur.push16le(hoty); // 12: hotspot y coordinate
- cur.push32le(IHDRsz + RGBsz + XORsz + ANDsz);
- // 14: cursor data byte size
- cur.push32le(22); // 18: offset of cursor data in the file
-
-
- // Cursor #1 InfoHeader (ICONIMAGE/BITMAPINFO)
- cur.push32le(IHDRsz); // 22: Infoheader size
- cur.push32le(w); // 26: Cursor width
- cur.push32le(h*2); // 30: XOR+AND height
- cur.push16le(1); // 34: number of planes
- cur.push16le(32); // 36: bits per pixel
- cur.push32le(0); // 38: Type of compression
-
- cur.push32le(XORsz + ANDsz); // 43: Size of Image
- // Gimp leaves this as 0
-
- cur.push32le(0); // 46: reserved
- cur.push32le(0); // 50: reserved
- cur.push32le(0); // 54: reserved
- cur.push32le(0); // 58: reserved
-
- // 62: color data (RGBQUAD icColors[])
- for (y = h-1; y >= 0; y -= 1) {
- for (x = 0; x < w; x += 1) {
- idx = y * Math.ceil(w / 8) + Math.floor(x/8);
- alpha = (mask[idx] << (x % 8)) & 0x80 ? 255 : 0;
-
- if (cmap) {
- idx = (w * y) + x;
- rgb = cmap[pixels[idx]];
- cur.push(rgb[2]); // blue
- cur.push(rgb[1]); // green
- cur.push(rgb[0]); // red
- cur.push(alpha); // alpha
- } else {
- idx = ((w * y) + x) * 4;
- cur.push(pixels[idx + 2]); // blue
- cur.push(pixels[idx + 1]); // green
- cur.push(pixels[idx ]); // red
- cur.push(alpha); // alpha
- }
- }
- }
-
- // XOR/bitmask data (BYTE icXOR[])
- // (ignored, just needs to be right size)
- for (y = 0; y < h; y += 1) {
- for (x = 0; x < Math.ceil(w / 8); x += 1) {
- cur.push(0x00);
- }
- }
-
- // AND/bitmask data (BYTE icAND[])
- // (ignored, just needs to be right size)
- for (y = 0; y < h; y += 1) {
- for (x = 0; x < Math.ceil(w / 8); x += 1) {
- cur.push(0x00);
- }
- }
-
- url = "data:image/x-icon;base64," + Base64.encode(cur);
- target.style.cursor = "url(" + url + ") " + hotx + " " + hoty + ", default";
- //Util.Debug("<< changeCursor, cur.length: " + cur.length);
-}
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