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video.js
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/**
* @fileoverview Implements the PC8080 Video component.
* @author <a href="mailto:[email protected]">Jeff Parsons</a>
* @copyright © 2012-2020 Jeff Parsons
*
* This file is part of PCjs, a computer emulation software project at <https://www.pcjs.org>.
*
* PCjs is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every modified copy of this work
* and to display that copyright notice when the software starts running; see COPYRIGHT in
* <https://www.pcjs.org/modules/shared/lib/defines.js>.
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of PCjs
* for purposes of the GNU General Public License, and the author does not claim any copyright
* as to their contents.
*/
"use strict";
if (typeof module !== "undefined") {
var Str = require("../../shared/lib/strlib");
var Web = require("../../shared/lib/weblib");
var DumpAPI = require("../../shared/lib/dumpapi");
var Component = require("../../shared/lib/component");
var State = require("../../shared/lib/state");
var PC8080 = require("./defines");
var ChipSet8080 = require("./chipset");
var Memory8080 = require("./memory");
var Messages8080 = require("./messages");
}
/**
* TODO: The Closure Compiler treats ES6 classes as 'struct' rather than 'dict' by default,
* which would force us to declare all class properties in the constructor, as well as prevent
* us from defining any named properties. So, for now, we mark all our classes as 'unrestricted'.
*
* @unrestricted
*/
class Video8080 extends Component {
/**
* Video8080(parmsVideo, canvas, context, textarea, container)
*
* The Video8080 component can be configured with the following (parmsVideo) properties:
*
* screenWidth: width of the screen canvas, in pixels
* screenHeight: height of the screen canvas, in pixels
* screenColor: background color of the screen canvas (default is black)
* screenRotate: the amount of counter-clockwise screen rotation required (eg, -90 or 270)
* aspectRatio (eg, 1.33)
* bufferAddr: the starting address of the frame buffer (eg, 0x2400)
* bufferRAM: true to use existing RAM (default is false)
* bufferFormat: if defined, one of the recognized formats in Video8080.FORMATS (eg, "vt100")
* bufferCols: the width of a single frame buffer row, in pixels (eg, 256)
* bufferRows: the number of frame buffer rows (eg, 224)
* bufferBits: the number of bits per column (default is 1)
* bufferLeft: the bit position of the left-most pixel in a byte (default is 0; CGA uses 7)
* bufferRotate: the amount of counter-clockwise buffer rotation required (eg, -90 or 270)
* interruptRate: normally the same as (or some multiple of) refreshRate (eg, 120)
* refreshRate: how many times updateScreen() should be performed per second (eg, 60)
*
* In addition, if a text-only display is being emulated, define the following properties:
*
* fontROM: URL of font ROM
* fontColor: default is white
* cellWidth: number (eg, 10 for VT100)
* cellHeight: number (eg, 10 for VT100)
*
* We record all the above values now, but we defer creation of the frame buffer until our initBus()
* handler is called. At that point, we will also compute the extent of the frame buffer, determine the
* appropriate "cell" size (ie, the number of pixels that updateScreen() will fetch and process at once),
* and then allocate our cell cache.
*
* Why interruptRate in addition to refreshRate? A higher interrupt rate is required for Space Invaders,
* because even though the CRT refreshes at 60Hz, the CRT controller interrupts the CPU *twice* per
* refresh (once after the top half of the screen has been redrawn, and again after the bottom half has
* been redrawn), so we need an interrupt rate of 120Hz. We pass the higher rate on to the CPU, so that
* it will call updateScreen() more frequently, but we still limit our screen updates to every *other* call.
*
* bufferRotate is an alternative to screenRotate; you may set one or the other (but not both) to -90 to
* enable different approaches to counter-clockwise 90-degree image rotation. screenRotate uses canvas
* transformation methods (translate(), rotate(), and scale()), while bufferRotate inverts the dimensions
* of the off-screen buffer and then relies on setPixel() to "rotate" the data into the proper location.
*
* @this {Video8080}
* @param {Object} parmsVideo
* @param {Object} [canvas]
* @param {Object} [context]
* @param {Object} [textarea]
* @param {Object} [container]
*/
constructor(parmsVideo, canvas, context, textarea, container)
{
super("Video", parmsVideo, Messages8080.VIDEO);
var video = this, sProp, sEvent;
this.fGecko = Web.isUserAgent("Gecko/");
this.cxScreen = parmsVideo['screenWidth'];
this.cyScreen = parmsVideo['screenHeight'];
this.addrBuffer = parmsVideo['bufferAddr'];
this.fUseRAM = parmsVideo['bufferRAM'];
var sFormat = parmsVideo['bufferFormat'];
this.nFormat = sFormat && Video8080.FORMATS[sFormat.toUpperCase()] || Video8080.FORMAT.UNKNOWN;
this.nColsBuffer = parmsVideo['bufferCols'];
this.nRowsBuffer = parmsVideo['bufferRows'];
this.cxCellDefault = this.cxCell = parmsVideo['cellWidth'] || 1;
this.cyCellDefault = this.cyCell = parmsVideo['cellHeight'] || 1;
this.abFontData = null;
this.fDotStretcher = false;
this.nBitsPerPixel = parmsVideo['bufferBits'] || 1;
this.iBitFirstPixel = parmsVideo['bufferLeft'] || 0;
this.rotateBuffer = parmsVideo['bufferRotate'];
if (this.rotateBuffer) {
this.rotateBuffer = this.rotateBuffer % 360;
if (this.rotateBuffer > 0) this.rotateBuffer -= 360;
if (this.rotateBuffer != -90) {
this.notice("unsupported buffer rotation: " + this.rotateBuffer);
this.rotateBuffer = 0;
}
}
this.rateInterrupt = parmsVideo['interruptRate'];
this.rateRefresh = parmsVideo['refreshRate'] || 60;
this.canvasScreen = canvas;
this.contextScreen = context;
this.textareaScreen = textarea;
this.inputScreen = textarea || canvas || null;
/*
* These variables are here in case we want/need to add support for borders later...
*/
this.xScreenOffset = this.yScreenOffset = 0;
this.cxScreenOffset = this.cxScreen;
this.cyScreenOffset = this.cyScreen;
this.cxScreenCell = (this.cxScreen / this.nColsBuffer)|0;
this.cyScreenCell = (this.cyScreen / this.nRowsBuffer)|0;
/*
* Now that we've finished using nRowsBuffer to help define the screen size, we add one more
* row for text modes, to account for the VT100's scroll line buffer (used for smooth scrolling).
*/
if (this.cyCell > 1) {
this.nRowsBuffer++;
this.bScrollOffset = 0;
this.fSkipSingleCellUpdate = false;
}
/*
* Support for disabling (or, less commonly, enabling) image smoothing, which all browsers
* seem to support now (well, OK, I still have to test the latest MS Edge browser), despite
* it still being labelled "experimental technology". Let's hope the browsers standardize
* on this. I see other options emerging, like the CSS property "image-rendering: pixelated"
* that's apparently been added to Chrome. Sigh.
*/
var fSmoothing = parmsVideo['smoothing'];
var sSmoothing = Web.getURLParm('smoothing');
if (sSmoothing) fSmoothing = (sSmoothing == "true");
this.fSmoothing = fSmoothing;
this.sSmoothing = Web.findProperty(this.contextScreen, 'imageSmoothingEnabled');
this.rotateScreen = parmsVideo['screenRotate'];
if (this.rotateScreen) {
this.rotateScreen = this.rotateScreen % 360;
if (this.rotateScreen > 0) this.rotateScreen -= 360;
/*
* TODO: Consider also disallowing any rotateScreen value if bufferRotate was already set; setting
* both is most likely a mistake, but who knows, maybe someone wants to use both for 180-degree rotation?
*/
if (this.rotateScreen != -90) {
this.notice("unsupported screen rotation: " + this.rotateScreen);
this.rotateScreen = 0;
} else {
this.contextScreen.translate(0, this.cyScreen);
this.contextScreen.rotate((this.rotateScreen * Math.PI)/180);
this.contextScreen.scale(this.cyScreen/this.cxScreen, this.cxScreen/this.cyScreen);
}
}
/*
* Here's the gross code to handle full-screen support across all supported browsers. The lack of standards
* is exasperating; browsers can't agree on 'Fullscreen' (most common) or 'FullScreen' (least common), and while
* some browsers honor other browser prefixes, most don't. Event handlers tend to be more consistent (ie, all
* lower-case).
*/
this.container = container;
if (this.container) {
sProp = Web.findProperty(container, 'requestFullscreen') || Web.findProperty(container, 'requestFullScreen');
if (sProp) {
this.container.doFullScreen = container[sProp];
sEvent = Web.findProperty(document, 'on', 'fullscreenchange');
if (sEvent) {
var sFullScreen = Web.findProperty(document, 'fullscreenElement') || Web.findProperty(document, 'fullScreenElement');
document.addEventListener(sEvent, function onFullScreenChange() {
video.notifyFullScreen(document[sFullScreen] != null);
}, false);
}
sEvent = Web.findProperty(document, 'on', 'fullscreenerror');
if (sEvent) {
document.addEventListener(sEvent, function onFullScreenError() {
video.notifyFullScreen();
}, false);
}
}
}
this.sFontROM = parmsVideo['fontROM'];
if (this.sFontROM) {
var sFileExt = Str.getExtension(this.sFontROM);
if (sFileExt != "json") {
this.sFontROM = Web.getHostOrigin() + DumpAPI.ENDPOINT + '?' + DumpAPI.QUERY.FILE + '=' + this.sFontROM + '&' + DumpAPI.QUERY.FORMAT + '=' + DumpAPI.FORMAT.BYTES;
}
Web.getResource(this.sFontROM, null, true, function(sURL, sResponse, nErrorCode) {
video.doneLoad(sURL, sResponse, nErrorCode);
});
}
this.ledBindings = {};
}
/**
* initBuffers()
*
* @this {Video8080}
* @return {boolean}
*/
initBuffers()
{
/*
* Allocate off-screen buffers now
*/
this.cxBuffer = this.nColsBuffer * this.cxCell;
this.cyBuffer = this.nRowsBuffer * this.cyCell;
var cxBuffer = this.cxBuffer;
var cyBuffer = this.cyBuffer;
if (this.rotateBuffer) {
cxBuffer = this.cyBuffer;
cyBuffer = this.cxBuffer;
}
this.sizeBuffer = 0;
if (!this.fUseRAM) {
this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
if (!this.bus.addMemory(this.addrBuffer, this.sizeBuffer, Memory8080.TYPE.VIDEO)) {
return false;
}
}
/*
* imageBuffer is only used for graphics modes. For text modes, we create a canvas
* for each font and draw characters by drawing from the font canvas to the target canvas.
*/
if (this.sizeBuffer) {
this.imageBuffer = this.contextScreen.createImageData(cxBuffer, cyBuffer);
this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
this.initCellCache(this.sizeBuffer >> 1);
} else {
/*
* We add an extra column per row to store the visible line length at the start of every row.
*/
this.initCellCache((this.nColsBuffer + 1) * this.nRowsBuffer);
}
this.canvasBuffer = document.createElement("canvas");
this.canvasBuffer.width = cxBuffer;
this.canvasBuffer.height = cyBuffer;
this.contextBuffer = this.canvasBuffer.getContext("2d");
this.aFonts = {};
this.initColors();
if (this.nFormat == Video8080.FORMAT.VT100) {
/*
* Beyond fonts, VT100 support requires that we maintain a number of additional properties:
*
* rateMonitor: must be either 50 or 60 (defaults to 60); we don't emulate the monitor refresh rate,
* but we do need to keep track of which rate has been selected, because that affects the number of
* "fill lines" present at the top of the VT100's frame buffer: 2 lines for 60Hz, 5 lines for 50Hz.
*
* The VT100 July 1982 Technical Manual, p. 4-89, shows the following sample frame buffer layout:
*
* 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
* --------------------------------------------------------------
* 0x2000: 7F 70 03 7F F2 D0 7F 70 06 7F 70 0C 7F 70 0F 7F
* 0x2010: 70 03 .. .. .. .. .. .. .. .. .. .. .. .. .. ..
* ...
* 0x22D0: 'D' 'A' 'T' 'A' ' ' 'F' 'O' 'R' ' ' 'F' 'I' 'R' 'S' 'T' ' ' 'L'
* 0x22E0: 'I' 'N' 'E' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
* ...
* 0x2320: 7F F3 23 'D' 'A' 'T' 'A' ' ' 'F' 'O' 'R' ' ' 'S' 'E' 'C' 'O'
* 0x2330: 'N' 'D' ' ' 'L' 'I' 'N' 'E' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
* ...
* 0x2BE0: ' ' ' ' 'E' 'N' 'D' ' ' 'O' 'F' ' ' 'L' 'A' 'S' 'T' ' ' 'L' 'I'
* 0x2BF0: 'N' 'E' 7F 70 06 .. .. .. .. .. .. .. .. .. .. ..
* 0x2C00: [AVO SCREEN RAM, IF ANY, BEGINS HERE]
*
* ERRATA: The manual claims that if you change the byte at 0x2002 from 03 to 09, the number of "fill
* lines" will change from 2 to 5 (for 50Hz operation), but it shows 06 instead of 0C at location 0x200B;
* if you follow the links, it's pretty clear that byte has to be 0C to yield 5 "fill lines". Since the
* address following the terminator at 0x2006 points to itself, it never makes sense for that terminator
* to be used EXCEPT at the end of the frame buffer.
*
* As an alternative to tracking the monitor refresh rate, we could hard-code some knowledge about how
* the VT100's 8080 code uses memory, and simply ignore lines below address 0x22D0. But the VT100 Video
* Processor makes no such assumption, and it would also break our test code in createFonts(), which
* builds a contiguous screen of test data starting at the default frame buffer address (0x2000).
*/
this.rateMonitor = 60;
/*
* The default character-selectable attribute (reverse video vs. underline) is controlled by fUnderline.
*/
this.fUnderline = false;
this.abLineBuffer = new Array(this.nColsBuffer);
}
/*
* Our 'smoothing' parameter defaults to null (which we treat the same as undefined), which means that
* image smoothing will be selectively enabled (ie, true for text modes, false for graphics modes); otherwise,
* we'll set image smoothing to whatever value was provided for ALL modes -- assuming the browser supports it.
*/
if (this.sSmoothing) {
this.contextScreen[this.sSmoothing] = (this.fSmoothing == null? false /* (this.nFormat == Video8080.FORMAT.VT100? true : false) */ : this.fSmoothing);
}
return true;
}
/**
* setBinding(sHTMLType, sBinding, control, sValue)
*
* @this {Video8080}
* @param {string} sHTMLType is the type of the HTML control (eg, "button", "list", "text", "submit", "textarea", "canvas")
* @param {string} sBinding is the value of the 'binding' parameter stored in the HTML control's "data-value" attribute (eg, "refresh")
* @param {HTMLElement} control is the HTML control DOM object (eg, HTMLButtonElement)
* @param {string} [sValue] optional data value
* @return {boolean} true if binding was successful, false if unrecognized binding request
*/
setBinding(sHTMLType, sBinding, control, sValue)
{
var video = this;
/*
* TODO: A more general-purpose binding mechanism would be nice someday....
*/
if (sHTMLType == "led" || sHTMLType == "rled") {
this.ledBindings[sBinding] = control;
return true;
}
switch (sBinding) {
case "fullScreen":
this.bindings[sBinding] = control;
if (this.container && this.container.doFullScreen) {
control.onclick = function onClickFullScreen() {
if (DEBUG) video.printMessage("fullScreen()");
video.doFullScreen();
};
} else {
if (DEBUG) this.log("FullScreen API not available");
control.parentNode.removeChild(/** @type {Node} */ (control));
}
return true;
default:
break;
}
return false;
}
/**
* initBus(cmp, bus, cpu, dbg)
*
* @this {Video8080}
* @param {Computer8080} cmp
* @param {Bus8080} bus
* @param {CPUState8080} cpu
* @param {Debugger8080} dbg
*/
initBus(cmp, bus, cpu, dbg)
{
this.cmp = cmp;
this.bus = bus;
this.cpu = cpu;
this.dbg = dbg;
/*
* Allocate the frame buffer (as needed) along with all other buffers.
*/
this.initBuffers();
/*
* If we have an associated keyboard, then ensure that the keyboard will be notified
* whenever the canvas gets focus and receives input.
*/
this.kbd = /** @type {Keyboard8080} */ (cmp.getMachineComponent("Keyboard"));
if (this.kbd) {
for (var s in this.ledBindings) {
this.kbd.setBinding("led", s, this.ledBindings[s]);
}
if (this.canvasScreen) {
this.kbd.setBinding(this.textareaScreen? "textarea" : "canvas", "screen", /** @type {HTMLElement} */ (this.inputScreen));
}
}
var video = this;
this.timerUpdateNext = this.cpu.addTimer(this.id, function() {
video.updateScreen();
});
this.cpu.setTimer(this.timerUpdateNext, this.getRefreshTime());
this.nUpdates = 0;
if (!this.sFontROM) this.setReady();
}
/**
* doneLoad(sURL, sFontData, nErrorCode)
*
* @this {Video8080}
* @param {string} sURL
* @param {string} sFontData
* @param {number} nErrorCode (response from server if anything other than 200)
*/
doneLoad(sURL, sFontData, nErrorCode)
{
if (nErrorCode) {
this.notice("Unable to load font ROM (error " + nErrorCode + ": " + sURL + ")");
return;
}
Component.addMachineResource(this.idMachine, sURL, sFontData);
try {
/*
* The most likely source of any exception will be here: parsing the JSON-encoded data.
*/
var ab = eval("(" + sFontData + ")");
var abFontData = ab['bytes'] || ab;
if (!abFontData || !abFontData.length) {
Component.error("Empty font ROM: " + sURL);
return;
}
else if (abFontData.length == 1) {
Component.error(abFontData[0]);
return;
}
/*
* Minimal font data validation, just to make sure we're not getting garbage from the server.
*/
if (abFontData.length == 2048) {
this.abFontData = abFontData;
this.createFonts();
}
else {
this.notice("Unrecognized font data length (" + abFontData.length + ")");
return;
}
} catch (e) {
this.notice("Font ROM data error: " + e.message);
return;
}
/*
* If we're still here, then we're ready!
*
* UPDATE: Per issue #21, I'm issuing setReady() *only* if a valid contextScreen exists *or* a Debugger is attached.
*
* TODO: Consider a more general-purpose solution for deciding whether or not the user wants to run in a "headless" mode.
*/
if (this.contextScreen || this.dbg) this.setReady();
}
/**
* createFonts()
*
* @this {Video8080}
* @return {boolean}
*/
createFonts()
{
/*
* We retain abFontData in case we have to rebuild the fonts (eg, when we switch from 80 to 132 columns)
*/
if (this.abFontData) {
this.fDotStretcher = (this.nFormat == Video8080.FORMAT.VT100);
this.aFonts[Video8080.VT100.FONT.NORML] = [
this.createFontVariation(this.cxCell, this.cyCell),
this.createFontVariation(this.cxCell, this.cyCell, this.fUnderline)
];
this.aFonts[Video8080.VT100.FONT.DWIDE] = [
this.createFontVariation(this.cxCell*2, this.cyCell),
this.createFontVariation(this.cxCell*2, this.cyCell, this.fUnderline)
];
this.aFonts[Video8080.VT100.FONT.DHIGH] = this.aFonts[Video8080.VT100.FONT.DHIGH_BOT] = [
this.createFontVariation(this.cxCell*2, this.cyCell*2),
this.createFontVariation(this.cxCell*2, this.cyCell*2, this.fUnderline)
];
return true;
}
return false;
}
/**
* createFontVariation(cxCell, cyCell, fUnderline)
*
* This creates a 16x16 character grid for the requested font variation. Variations include:
*
* 1) no variation (cell size is this.cxCell x this.cyCell)
* 2) double-wide characters (cell size is this.cxCell*2 x this.cyCell)
* 3) double-high double-wide characters (cell size is this.cxCell*2 x this.cyCell*2)
* 4) any of the above with either reverse video or underline enabled (default is neither)
*
* @this {Video8080}
* @param {number} cxCell is the target width of each character in the grid
* @param {number} cyCell is the target height of each character in the grid
* @param {boolean} [fUnderline] (null for unmodified font, false for reverse video, true for underline)
* @return {Object}
*/
createFontVariation(cxCell, cyCell, fUnderline)
{
/*
* On a VT100, cxCell,cyCell is initially 10,10, but may change to 9,10 for 132-column mode.
*/
this.assert(cxCell == this.cxCell || cxCell == this.cxCell*2);
this.assert(cyCell == this.cyCell || cyCell == this.cyCell*2);
/*
* Create a font canvas that is both 16 times the target character width and the target character height,
* ensuring that it will accommodate 16x16 characters (for a maximum of 256). Note that the VT100 font ROM
* defines only 128 characters, so that canvas will contain only 16x8 entries.
*/
var nFontBytesPerChar = this.cxCellDefault <= 8? 8 : 16;
var nFontByteOffset = nFontBytesPerChar > 8? 15 : 0;
var nChars = this.abFontData.length / nFontBytesPerChar;
/*
* The absence of a boolean for fUnderline means that both fReverse and fUnderline are "falsey". The presence
* of a boolean means that fReverse will be true OR fUnderline will be true, but NOT both.
*/
var fReverse = (fUnderline === false);
var font = {cxCell: cxCell, cyCell: cyCell};
font.canvas = document.createElement("canvas");
font.canvas.width = cxCell * 16;
font.canvas.height = cyCell * (nChars / 16);
font.context = font.canvas.getContext("2d");
var imageChar = font.context.createImageData(cxCell, cyCell);
for (var iChar = 0; iChar < nChars; iChar++) {
for (var y = 0, yDst = y; y < this.cyCell; y++) {
var offFontData = iChar * nFontBytesPerChar + ((nFontByteOffset + y) & (nFontBytesPerChar - 1));
var bits = (fUnderline && y == 8? 0xff : this.abFontData[offFontData]);
for (var nRows = 0; nRows < (cyCell / this.cyCell); nRows++) {
var bitPrev = 0;
for (var x = 0, xDst = x; x < this.cxCell; x++) {
/*
* While x goes from 0 to cxCell-1, obviously we will run out of bits after x is 7;
* since the final bit must be replicated all the way to the right edge of the cell
* (so that line-drawing characters seamlessly connect), we ensure that the effective
* shift count remains stuck at 7 once it reaches 7.
*/
var bitReal = bits & (0x80 >> (x > 7? 7 : x));
var bit = (this.fDotStretcher && !bitReal && bitPrev)? bitPrev : bitReal;
for (var nCols = 0; nCols < (cxCell / this.cxCell); nCols++) {
if (fReverse) bit = !bit;
this.setPixel(imageChar, xDst, yDst, bit? 1 : 0);
xDst++;
}
bitPrev = bitReal;
}
yDst++;
}
}
/*
* (iChar >> 4) performs the integer equivalent of Math.floor(iChar / 16), and (iChar & 0xf) is the equivalent of (iChar % 16).
*/
font.context.putImageData(imageChar, (iChar & 0xf) * cxCell, (iChar >> 4) * cyCell);
}
return font;
}
/**
* powerUp(data, fRepower)
*
* @this {Video8080}
* @param {Object|null} data
* @param {boolean} [fRepower]
* @return {boolean} true if successful, false if failure
*/
powerUp(data, fRepower)
{
if (!fRepower) {
if (data) {
if (!this.restore(data)) return false;
}
}
/*
* Because the VT100 frame buffer can be located anywhere in RAM (above 0x2000), we must defer this
* test code until the powerUp() notification handler is called, when all RAM has (hopefully) been allocated.
*
* NOTE: The following test screen was useful for early testing, but a *real* VT100 doesn't display a test screen,
* so this code is no longer enabled by default. Remove MAXDEBUG if you want to see it again.
*/
if (MAXDEBUG && this.nFormat == Video8080.FORMAT.VT100) {
/*
* Build a test screen in the VT100 frame buffer; we'll mimic the "SET-UP A" screen, since it uses
* all the font variations. The process involves iterating over 0-based row numbers -2 (or -5 if 50Hz
* operation is selected) through 24, checking aLineData for a matching row number, and converting the
* corresponding string(s) to appropriate byte values. Negative row numbers correspond to "fill lines"
* and do not require a row entry. If multiple strings are present for a given row, we invert the
* default character attribute for subsequent strings. An empty array ends the screen build process.
*/
var aLineData = {
0: [Video8080.VT100.FONT.DHIGH, 'SET-UP A'],
2: [Video8080.VT100.FONT.DWIDE, 'TO EXIT PRESS "SET-UP"'],
22: [Video8080.VT100.FONT.NORML, ' T T T T T T T T T'],
23: [Video8080.VT100.FONT.NORML, '1234567890', '1234567890', '1234567890', '1234567890', '1234567890', '1234567890', '1234567890', '1234567890'],
24: []
};
var addr = this.addrBuffer;
var addrNext = -1, font = -1;
var b, nFill = (this.rateMonitor == 60? 2 : 5);
for (var iRow = -nFill; iRow < this.nRowsBuffer; iRow++) {
var lineData = aLineData[iRow];
if (addrNext >= 0) {
var fBreak = false;
addrNext = addr + 2;
if (!lineData) {
if (font == Video8080.VT100.FONT.DHIGH) {
lineData = aLineData[iRow-1];
font = Video8080.VT100.FONT.DHIGH_BOT;
}
}
else {
if (lineData.length) {
font = lineData[0];
} else {
addrNext = addr - 1;
fBreak = true;
}
}
b = (font & Video8080.VT100.LINEATTR.FONTMASK) | ((addrNext >> 8) & Video8080.VT100.LINEATTR.ADDRMASK) | Video8080.VT100.LINEATTR.ADDRBIAS;
this.bus.setByteDirect(addr++, b);
this.bus.setByteDirect(addr++, addrNext & 0xff);
if (fBreak) break;
}
if (lineData) {
var attr = 0;
for (var j = 1; j < lineData.length; j++) {
var s = lineData[j];
for (var k = 0; k < s.length; k++) {
this.bus.setByteDirect(addr++, s.charCodeAt(k) | attr);
}
attr ^= 0x80;
}
}
this.bus.setByteDirect(addr++, Video8080.VT100.LINETERM);
addrNext = addr;
}
/*
* NOTE: By calling updateVT100() directly, we are bypassing any checks that might block the update.
*/
this.updateVT100();
}
return true;
}
/**
* powerDown(fSave, fShutdown)
*
* @this {Video8080}
* @param {boolean} [fSave]
* @param {boolean} [fShutdown]
* @return {Object|boolean} component state if fSave; otherwise, true if successful, false if failure
*/
powerDown(fSave, fShutdown)
{
return !fSave || this.save();
}
/**
* save()
*
* This implements save support for the Video8080 component.
*
* @this {Video8080}
* @return {Object|null}
*/
save()
{
var state = new State(this);
state.set(0, []);
return state.data();
}
/**
* restore(data)
*
* This implements restore support for the Video8080 component.
*
* @this {Video8080}
* @param {Object} data
* @return {boolean} true if restore successful, false if not
*/
restore(data)
{
return true;
}
/**
* updateDimensions(nCols, nRows)
*
* Called from the ChipSet component whenever the screen dimensions have been dynamically altered.
*
* @this {Video8080}
* @param {number} nCols (should be either 80 or 132; 80 is the default)
* @param {number} nRows (should be either 24 or 14; 24 is the default)
*/
updateDimensions(nCols, nRows)
{
this.printMessage("updateDimensions(" + nCols + "," + nRows + ")");
this.nColsBuffer = nCols;
/*
* Even when the number of effective rows is 14 (or 15 counting the scroll line buffer), we want
* to leave the number of rows at 24 (or 25 counting the scroll line buffer), because the VT100 doesn't
* actually change character height (only character width).
*
* this.nRowsBuffer = nRows+1; // +1 for scroll line buffer
*/
this.cxCell = this.cxCellDefault;
if (nCols > 80) this.cxCell--; // VT100 font cells are 9x10 instead of 10x10 in 132-column mode
if (this.initBuffers()) {
this.createFonts();
}
}
/**
* updateRate(nRate)
*
* Called from the ChipSet component whenever the monitor refresh rate has been dynamically altered.
*
* @this {Video8080}
* @param {number} nRate (should be either 50 or 60; 60 is the default)
*/
updateRate(nRate)
{
this.printMessage("updateRate(" + nRate + ")");
this.rateMonitor = nRate;
}
/**
* updateScrollOffset(bScroll)
*
* Called from the ChipSet component whenever the screen scroll offset has been dynamically altered.
*
* @this {Video8080}
* @param {number} bScroll
*/
updateScrollOffset(bScroll)
{
this.printMessage("updateScrollOffset(" + bScroll + ")");
if (this.bScrollOffset !== bScroll) {
this.bScrollOffset = bScroll;
/*
* WARNING: If we immediately redraw the screen on the first wrap of the scroll offset back to zero,
* we end up "slamming" the screen's contents back down again, because it seems that the frame buffer
* contents haven't actually been scrolled yet. So we redraw now ONLY if bScroll is non-zero, lest
* we ruin the smooth-scroll effect.
*
* And this change, while necessary, is not sufficient, because another intervening updateScreen()
* call could still occur before the frame buffer contents are actually scrolled; and ordinarily, if the
* buffer hasn't changed, updateScreen() would do nothing, but alas, if the cursor happens to get toggled
* in the interim, updateScreen() will want to update exactly ONE cell.
*
* So we deal with that by setting the fSkipSingleCellUpdate flag. Now of course, there's no guarantee
* that the next update of only ONE cell will always be a cursor update, but even if it isn't, skipping
* that update doesn't seem like a huge cause for concern.
*/
if (bScroll) {
this.updateScreen(true);
} else {
this.fSkipSingleCellUpdate = true;
}
}
}
/**
* doFullScreen()
*
* @this {Video8080}
* @return {boolean} true if request successful, false if not (eg, failed OR not supported)
*/
doFullScreen()
{
var fSuccess = false;
if (this.container) {
if (this.container.doFullScreen) {
/*
* Styling the container with a width of "100%" and a height of "auto" works great when the aspect ratio
* of our virtual screen is at least roughly equivalent to the physical screen's aspect ratio, but now that
* we support virtual VGA screens with an aspect ratio of 1.33, that's very much out of step with modern
* wide-screen monitors, which usually have an aspect ratio of 1.6 or greater.
*
* And unfortunately, none of the browsers I've tested appear to make any attempt to scale our container to
* the physical screen's dimensions, so the bottom of our screen gets clipped. To prevent that, I reduce
* the width from 100% to whatever percentage will accommodate the entire height of the virtual screen.
*
* NOTE: Mozilla recommends both a width and a height of "100%", but all my tests suggest that using "auto"
* for height works equally well, so I'm sticking with it, because "auto" is also consistent with how I've
* implemented a responsive canvas when the browser window is being resized.
*/
var sWidth = "100%";
var sHeight = "auto";
if (screen && screen.width && screen.height) {
var aspectPhys = screen.width / screen.height;
var aspectVirt = this.cxScreen / this.cyScreen;
if (aspectPhys > aspectVirt) {
sWidth = Math.round(aspectVirt / aspectPhys * 100) + '%';
}
// TODO: We may need to someday consider the case of a physical screen with an aspect ratio < 1.0....
}
if (!this.fGecko) {
this.container.style.width = sWidth;
this.container.style.height = sHeight;
} else {
/*
* Sadly, the above code doesn't work for Firefox, because as http://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Using_full_screen_mode
* explains:
*
* 'It's worth noting a key difference here between the Gecko and WebKit implementations at this time:
* Gecko automatically adds CSS rules to the element to stretch it to fill the screen: "width: 100%; height: 100%".
*
* Which would be OK if Gecko did that BEFORE we're called, but apparently it does that AFTER, effectively
* overwriting our careful calculations. So we style the inner element (canvasScreen) instead, which
* requires even more work to ensure that the canvas is properly centered. FYI, this solution is consistent
* with Mozilla's recommendation for working around their automatic CSS rules:
*
* '[I]f you're trying to emulate WebKit's behavior on Gecko, you need to place the element you want
* to present inside another element, which you'll make fullscreen instead, and use CSS rules to adjust
* the inner element to match the appearance you want.'
*/
this.canvasScreen.style.width = sWidth;
this.canvasScreen.style.width = sWidth;
this.canvasScreen.style.display = "block";
this.canvasScreen.style.margin = "auto";
}
this.container.style.backgroundColor = "black";
this.container.doFullScreen();
fSuccess = true;
}
this.setFocus();
}
return fSuccess;
}
/**
* notifyFullScreen(fFullScreen)
*
* @this {Video8080}
* @param {boolean} [fFullScreen] (undefined if there was a full-screen error)
*/
notifyFullScreen(fFullScreen)
{
if (!fFullScreen && this.container) {
if (!this.fGecko) {
this.container.style.width = this.container.style.height = "";
} else {
this.canvasScreen.style.width = this.canvasScreen.style.height = "";
}
}
this.printMessage("notifyFullScreen(" + fFullScreen + ")");
}
/**
* setFocus()
*
* @this {Video8080}
*/
setFocus()
{
if (this.inputScreen) this.inputScreen.focus();
}
/**
* getRefreshTime()
*
* @this {Video8080}
* @return {number} (number of milliseconds per refresh)
*/
getRefreshTime()
{
return 1000 / Math.max(this.rateRefresh, this.rateInterrupt);
}
/**
* initCellCache(nCells)
*
* Initializes the contents of our internal cell cache.
*
* @this {Video8080}
* @param {number} nCells
*/
initCellCache(nCells)
{
this.nCellCache = nCells;
this.fCellCacheValid = false;
if (this.aCellCache === undefined || this.aCellCache.length != this.nCellCache) {
this.aCellCache = new Array(this.nCellCache);
}
}
/**
* initColors()
*
* This creates an array of nColors, with additional OVERLAY_TOTAL colors tacked on to the end of the array.
*
* @this {Video8080}
*/
initColors()
{
var rgbBlack = [0x00, 0x00, 0x00, 0xff];
var rgbWhite = [0xff, 0xff, 0xff, 0xff];
this.nColors = (1 << this.nBitsPerPixel);
this.aRGB = new Array(this.nColors + Video8080.COLORS.OVERLAY_TOTAL);
this.aRGB[0] = rgbBlack;
this.aRGB[1] = rgbWhite;
if (this.nFormat == Video8080.FORMAT.SI1978) {
var rgbGreen = [0x00, 0xff, 0x00, 0xff];
//noinspection UnnecessaryLocalVariableJS
var rgbYellow = [0xff, 0xff, 0x00, 0xff];
this.aRGB[this.nColors + Video8080.COLORS.OVERLAY_TOP] = rgbYellow;
this.aRGB[this.nColors + Video8080.COLORS.OVERLAY_BOTTOM] = rgbGreen;
}
}
/**
* setPixel(image, x, y, bPixel)
*
* @this {Video8080}
* @param {Object} image
* @param {number} x
* @param {number} y
* @param {number} bPixel (ie, an index into aRGB)
*/
setPixel(image, x, y, bPixel)
{
var index;
if (!this.rotateBuffer) {
index = (x + y * image.width);
} else {
index = (image.height - x - 1) * image.width + y;
}
if (bPixel && this.nFormat == Video8080.FORMAT.SI1978) {
if (x >= 208 && x < 236) {
bPixel = this.nColors + Video8080.COLORS.OVERLAY_TOP;
}
else if (x >= 28 && x < 72) {
bPixel = this.nColors + Video8080.COLORS.OVERLAY_BOTTOM;
}
}
var rgb = this.aRGB[bPixel];
index *= rgb.length;
image.data[index] = rgb[0];
image.data[index+1] = rgb[1];
image.data[index+2] = rgb[2];
image.data[index+3] = rgb[3];
}
/**
* updateChar(idFont, col, row, data, context)
*
* Updates a particular character cell (row,col) in the associated window.
*
* @this {Video8080}
* @param {number} idFont