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Canvas.js
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Canvas.js
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// Canvas.js - Graphics output to HTML canvas
// (c) Marco Vieth, 2019
// https://benchmarko.github.io/CPCBasic/
//
/* globals ArrayBuffer, Uint8Array, Uint32Array */
"use strict";
var Utils;
if (typeof require !== "undefined") {
Utils = require("./Utils.js"); // eslint-disable-line global-require
}
function Canvas(options) {
this.init(options);
}
Canvas.prototype = {
// http://www.cpcwiki.eu/index.php/CPC_Palette
aColors: [
"#000000", // 0 Black
"#000080", // 1 Blue
"#0000FF", // 2 Bright Blue
"#800000", // 3 Red
"#800080", // 4 Magenta
"#8000FF", // 5 Mauve
"#FF0000", // 6 Bright Red
"#FF0080", // 7 Purple
"#FF00FF", // 8 Bright Magenta
"#008000", // 9 Green
"#008080", // 10 Cyan
"#0080FF", // 11 Sky Blue
"#808000", // 12 Yellow
"#808080", // 13 White
"#8080FF", // 14 Pastel Blue
"#FF8000", // 15 Orange
"#FF8080", // 16 Pink
"#FF80FF", // 17 Pastel Magenta
"#00FF00", // 18 Bright Green
"#00FF80", // 19 Sea Green
"#00FFFF", // 20 Bright Cyan
"#80FF00", // 21 Lime
"#80FF80", // 22 Pastel Green
"#80FFFF", // 23 Pastel Cyan
"#FFFF00", // 24 Bright Yellow
"#FFFF80", // 25 Pastel Yellow
"#FFFFFF", // 26 Bright White
"#808080", // 27 White (same as 13)
"#FF00FF", // 28 Bright Magenta (same as 8)
"#FFFF80", // 29 Pastel Yellow (same as 25)
"#000080", // 30 Blue (same as 1)
"#00FF80" // 31 Sea Green (same as 19)
],
// mode 0: pen 0-15,16=border; inks for pen 14,15 are alternating: "1,24", "16,11"
aDefaultInks: [
[1, 24, 20, 6, 26, 0, 2, 8, 10, 12, 14, 16, 18, 22, 1, 16, 1], // eslint-disable-line array-element-newline
[1, 24, 20, 6, 26, 0, 2, 8, 10, 12, 14, 16, 18, 22, 24, 11, 1] // eslint-disable-line array-element-newline
],
aModeData: [
{ // mode 0
iPens: 16, // number of pens
iPixelWidth: 4, // pixel width
iPixelHeight: 2 // pixel height
},
{ // mode 1
iPens: 4,
iPixelWidth: 2,
iPixelHeight: 2
},
{ // mode 2
iPens: 2,
iPixelWidth: 1,
iPixelHeight: 2
},
{ // mode 3
iPens: 16, // mode 3 not available on a real CPC
iPixelWidth: 1,
iPixelHeight: 1
}
],
// CPC Unicode map for text mode (https://www.unicode.org/L2/L2019/19025-terminals-prop.pdf AMSCPC.TXT) incomplete
sCpc2Unicode:
"................................ !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]\u2195_`abcdefghijklmnopqrstuvwxyz{|}~\u2591"
+ "\u00A0\u2598\u259D\u2580\u2596\u258C\u259E\u259B\u2597\u259A\u2590\u259C\u2584\u2599\u259F\u2588\u00B7\u2575\u2576\u2514\u2577\u2502\u250C"
+ "\u251C\u2574\u2518\u2500\u2534\u2510\u2524\u252C\u253C\u005E\u00B4\u00A8\u00A3\u00A9\u00B6\u00A7\u2018\u00BC\u00BD\u00BE\u00B1\u00F7\u00AC"
+ "\u00BF\u00A1\u03B1\u03B2\u03B3\u03B4\u03B5\u03B8\u03BB\u03BC\u03C0\u03C3\u03C6\u03C8\u03C7\u03C9\u03A3\u03A9\u1FBA0\u1FBA1\u1FBA3\u1FBA2\u1FBA7"
+ "\u1FBA5\u1FBA6\u1FBA4\u1FBA8\u1FBA9\u1FBAE\u2573\u2571\u2572\u1FB95\u2592\u23BA\u23B9\u23BD\u23B8\u25E4\u25E5\u25E2\u25E3\u1FB8E\u1FB8D\u1FB8F"
+ "\u1FB8C\u1FB9C\u1FB9D\u1FB9E\u1FB9F\u263A\u2639\u2663\u2666\u2665\u2660\u25CB\u25CF\u25A1\u25A0\u2642\u2640\u2669\u266A\u263C\uFFBDB\u2B61\u2B63"
+ "\u2B60\u2B62\u25B2\u25BC\u25B6\u25C0\u1FBC6\u1FBC5\u1FBC7\u1FBC8\uFFBDC\uFFBDD\u2B65\u2B64",
init: function (options) {
var iBorderWidth = 4,
iWidth, iHeight, canvas, ctx;
this.options = Object.assign({}, options);
this.fnUpdateCanvasHandler = this.updateCanvas.bind(this);
this.fnUpdateCanvas2Handler = this.updateCanvas2.bind(this);
this.iFps = 15; // FPS for canvas update
this.cpcAreaBox = document.getElementById("cpcAreaBox"); // TODO: move to view
this.textText = document.getElementById("textText"); // TODO: move to view
this.aCharset = this.options.aCharset;
this.iGColMode = 0; // 0=normal, 1=xor, 2=and, 3=or
this.iMask = 255;
this.iMaskBit = 128;
this.iMaskFirst = 1;
this.iOffset = 0; // screen offset
canvas = document.getElementById("cpcCanvas");
this.canvas = canvas;
// make sure canvas is not hidden (allows to get width, height, set style)
if (canvas.offsetParent === null) {
Utils.console.error("Error: canvas is not visible!");
}
iWidth = canvas.width;
iHeight = canvas.height;
this.iWidth = iWidth;
this.iHeight = iHeight;
this.iBorderWidth = iBorderWidth;
canvas.style.borderWidth = iBorderWidth + "px";
canvas.style.borderStyle = "solid";
this.dataset8 = new Uint8Array(new ArrayBuffer(iWidth * iHeight)); // array with pen values
this.bNeedUpdate = false;
this.bNeedTextUpdate = false;
this.aColorValues = this.extractAllColorValues(this.aColors);
this.aCurrentInks = [];
this.aSpeedInk = [];
this.aPen2ColorMap = [];
this.animationTimeout = null;
this.animationFrame = null;
if (this.canvas.getContext) {
ctx = this.canvas.getContext("2d");
this.imageData = ctx.getImageData(0, 0, iWidth, iHeight);
if (typeof Uint32Array !== "undefined" && this.imageData.data.buffer) { // imageData.data.buffer not available on IE10
this.fnCopy2Canvas = this.iOffset ? this.copy2Canvas32bitWithOffset : this.copy2Canvas32bit;
this.bLittleEndian = this.isLittleEndian();
this.aPen2Color32 = new Uint32Array(new ArrayBuffer(this.aModeData[3].iPens * 4));
this.aData32 = new Uint32Array(this.imageData.data.buffer);
this.bUse32BitCopy = true;
Utils.console.log("Canvas: using optimized copy2Canvas32bit, littleEndian:", this.bLittleEndian);
} else {
this.fnCopy2Canvas = this.iOffset ? this.copy2Canvas8bit : this.copy2Canvas8bit; // TODO
this.setAlpha(255);
this.bUse32BitCopy = false;
Utils.console.log("Canvas: using copy2Canvas8bit");
}
} else {
Utils.console.warn("Error: canvas.getContext is not supported.");
this.imageData = null;
}
this.reset();
},
reset: function () {
this.resetTextBuffer();
this.setNeedTextUpdate();
this.changeMode(1);
this.iGPen = null; // force update
this.iGPaper = null;
this.iInkSet = 0;
this.setDefaultInks();
this.aSpeedInk[0] = 10;
this.aSpeedInk[1] = 10;
this.iSpeedInkCount = this.aSpeedInk[this.iInkSet];
this.canvas.style.borderColor = this.aColors[this.aCurrentInks[this.iInkSet][16]];
this.setGPen(1);
this.setGPaper(0);
this.resetCustomChars();
this.setMode(1);
this.clearGraphicsWindow();
},
resetCustomChars: function () {
this.oCustomCharset = {}; // symbol
},
resetTextBuffer: function () {
this.aTextBuffer = [];
},
isLittleEndian: function () {
var b = new Uint8Array([255, 0, 0, 0]); // eslint-disable-line array-element-newline
return ((new Uint32Array(b, b.buffer))[0] === 255);
},
extractColorValues: function (sColor) { // from "#rrggbb"
return [
parseInt(sColor.substring(1, 3), 16),
parseInt(sColor.substring(3, 5), 16),
parseInt(sColor.substring(5, 7), 16)
];
},
extractAllColorValues: function (aColors) {
var aColorValues = [],
i;
for (i = 0; i < aColors.length; i += 1) {
aColorValues[i] = this.extractColorValues(aColors[i]);
}
return aColorValues;
},
setAlpha: function (iAlpha) {
var buf8 = this.imageData.data,
iLength = this.dataset8.length, // or: this.iWidth * this.iHeight
i;
for (i = 0; i < iLength; i += 1) {
buf8[i * 4 + 3] = iAlpha; // alpha
}
},
setNeedUpdate: function () {
this.bNeedUpdate = true;
},
setNeedTextUpdate: function () {
this.bNeedTextUpdate = true;
},
updateCanvas2: function () {
this.animationFrame = requestAnimationFrame(this.fnUpdateCanvasHandler);
if (this.bNeedUpdate) { // could be improved: update only updateRect
this.bNeedUpdate = false;
// we always do a full updateCanvas...
if (this.imageData) { // not available on e.g. IE8
this.fnCopy2Canvas();
}
}
if (this.textText.offsetParent) { // text area visible?
if (this.bNeedTextUpdate) {
this.bNeedTextUpdate = false;
this.updateTextWindow();
}
}
},
// http://creativejs.com/resources/requestanimationframe/ (set frame rate)
// https://stackoverflow.com/questions/19764018/controlling-fps-with-requestanimationframe
updateCanvas: function () {
this.animationTimeout = setTimeout(this.fnUpdateCanvas2Handler, 1000 / this.iFps);
},
startUpdateCanvas: function () {
if (this.animationFrame === null && this.canvas.offsetParent !== null) { // animation off and canvas visible in DOM?
this.updateCanvas();
}
},
stopUpdateCanvas: function () {
if (this.animationFrame !== null) {
cancelAnimationFrame(this.animationFrame);
clearTimeout(this.animationTimeout);
this.animationFrame = null;
this.animationTimeout = null;
}
},
copy2Canvas8bit: function () {
var ctx = this.canvas.getContext("2d"),
buf8 = this.imageData.data, // use Uint8ClampedArray from canvas
dataset8 = this.dataset8,
iLength = dataset8.length, // or: this.iWidth * this.iHeight
aPen2ColorMap = this.aPen2ColorMap,
i, j, aColor;
for (i = 0; i < iLength; i += 1) {
aColor = aPen2ColorMap[dataset8[i]];
j = i * 4;
buf8[j] = aColor[0]; // r
buf8[j + 1] = aColor[1]; // g
buf8[j + 2] = aColor[2]; // b
// alpha already set to 255
}
ctx.putImageData(this.imageData, 0, 0);
},
copy2Canvas32bit: function () {
var ctx = this.canvas.getContext("2d"),
dataset8 = this.dataset8,
aData32 = this.aData32,
aPen2Color32 = this.aPen2Color32,
i;
for (i = 0; i < aData32.length; i += 1) {
aData32[i] = aPen2Color32[dataset8[i]];
}
ctx.putImageData(this.imageData, 0, 0);
},
copy2Canvas32bitWithOffset: function () {
var ctx = this.canvas.getContext("2d"),
dataset8 = this.dataset8,
aData32 = this.aData32,
aPen2Color32 = this.aPen2Color32,
iOffset = this.iOffset,
i;
for (i = 0; i < aData32.length - iOffset; i += 1) {
aData32[i + iOffset] = aPen2Color32[dataset8[i]];
}
for (i = aData32.length - iOffset; i < aData32.length; i += 1) {
aData32[i + iOffset - aData32.length] = aPen2Color32[dataset8[i]];
}
ctx.putImageData(this.imageData, 0, 0);
},
setScreenOffset: function (iOffset) {
if (iOffset) {
// TODO
iOffset = (iOffset % 80) * 8 + ((iOffset / 80) | 0) * 80 * 16 * 8; // eslint-disable-line no-bitwise
iOffset = 640 * 400 - iOffset;
}
if (iOffset !== this.iOffset) {
this.iOffset = iOffset;
if (this.bUse32BitCopy) {
this.fnCopy2Canvas = iOffset ? this.copy2Canvas32bitWithOffset : this.copy2Canvas32bit;
} else {
this.fnCopy2Canvas = iOffset ? this.copy2Canvas8bit : this.copy2Canvas8bit; // TODO: for older browsers
}
this.setNeedUpdate();
}
},
updateTextWindow: function () {
var aTextBuffer = this.aTextBuffer,
sOut = "",
x, y, aTextBufferRow;
for (y = 0; y < aTextBuffer.length; y += 1) {
aTextBufferRow = aTextBuffer[y];
if (aTextBufferRow) {
for (x = 0; x < aTextBufferRow.length; x += 1) {
sOut += this.sCpc2Unicode.charAt(aTextBufferRow[x] || 32); // works also on IE8, (not: this.sCpc2Unicode[...])
}
}
sOut += "\n";
}
this.textText.value = sOut;
},
updateColorMap: function () {
var aColorValues = this.aColorValues,
aCurrentInksInSet = this.aCurrentInks[this.iInkSet],
aPen2ColorMap = this.aPen2ColorMap,
aPen2Color32 = this.aPen2Color32,
aColor, i;
for (i = 0; i < 16; i += 1) {
aPen2ColorMap[i] = aColorValues[aCurrentInksInSet[i]];
}
if (aPen2Color32) {
for (i = 0; i < 16; i += 1) {
aColor = aPen2ColorMap[i];
if (this.bLittleEndian) {
aPen2Color32[i] = aColor[0] + aColor[1] * 256 + aColor[2] * 65536 + 255 * 65536 * 256;
} else {
aPen2Color32[i] = aColor[2] + aColor[1] * 256 + aColor[0] * 65536 + 255 * 65536 * 256; // for big endian (untested)
}
}
}
},
updateSpeedInk: function () {
var iPens = this.oModeData.iPens,
iCurrentInkSet, iNewInkSet, i;
this.iSpeedInkCount -= 1;
if (this.iSpeedInkCount <= 0) {
iCurrentInkSet = this.iInkSet;
iNewInkSet = iCurrentInkSet ^ 1; // eslint-disable-line no-bitwise
this.iInkSet = iNewInkSet;
this.iSpeedInkCount = this.aSpeedInk[iNewInkSet];
// check for blinking inks which pens are visible in the current mode
for (i = 0; i < iPens; i += 1) {
if (this.aCurrentInks[iNewInkSet][i] !== this.aCurrentInks[iCurrentInkSet][i]) {
this.updateColorMap(); // need ink update
this.bNeedUpdate = true; // we also need update
break;
}
}
// check border ink
if (this.aCurrentInks[iNewInkSet][16] !== this.aCurrentInks[iCurrentInkSet][16]) {
this.canvas.style.borderColor = this.aColors[this.aCurrentInks[iNewInkSet][16]];
}
}
},
setCustomChar: function (iChar, aCharData) {
this.oCustomCharset[iChar] = aCharData;
},
getCharData: function (iChar) {
var aCharData = this.oCustomCharset[iChar] || this.aCharset[iChar];
return aCharData;
},
setDefaultInks: function () {
this.aCurrentInks[0] = this.aDefaultInks[0].slice(); // copy ink set 0 array
this.aCurrentInks[1] = this.aDefaultInks[1].slice(); // copy ink set 1 array
this.updateColorMap();
this.setGPen(this.iGPen);
},
setFocusOnCanvas: function () {
this.cpcAreaBox.style.background = "#463c3c";
if (this.canvas && this.canvas.focus) {
this.canvas.focus();
}
this.bHasFocus = true;
},
getMousePos: function (event) {
var oRect = this.canvas.getBoundingClientRect(),
oPos = {
x: event.clientX - this.iBorderWidth - oRect.left,
y: event.clientY - this.iBorderWidth - oRect.top
};
return oPos;
},
canvasClickAction2: function (event) {
var oPos = this.getMousePos(event),
x = oPos.x,
y = oPos.y,
iCharWidth = this.oModeData.iPixelWidth * 8,
iCharHeight = this.oModeData.iPixelHeight * 8,
xTxt, yTxt, iChar;
/* eslint-disable no-bitwise */
x |= 0; // force integer
y |= 0;
xTxt = (x / iCharWidth) | 0;
yTxt = (y / iCharHeight) | 0;
/* eslint-enable no-bitwise */
iChar = this.getCharFromTextBuffer(xTxt, yTxt); // is there a character an the click position?
if (iChar === undefined && event.detail === 2) { // no char but mouse double click?
iChar = 13; // use CR
}
if (iChar !== undefined && this.options.onClickKey) { // call click handler (put char in keyboard input buffer)
this.options.onClickKey(String.fromCharCode(iChar));
}
// for graphics coordinates, adapt origin
x -= this.xOrig;
y = this.iHeight - 1 - (y + this.yOrig);
if (this.xPos === 1000 && this.yPos === 1000) { // only activate move if pos is 1000, 1000
this.move(x, y);
}
if (Utils.debug > 0) {
Utils.console.debug("onCpcCanvasClick: x-xOrig", x, "y-yOrig", y, "iChar", iChar, "char", String.fromCharCode(iChar), "detail", event.detail);
}
},
onCpcCanvasClick: function (event) {
if (!this.bHasFocus) {
this.setFocusOnCanvas();
} else {
this.canvasClickAction2(event);
}
if (event.stopPropagation) {
event.stopPropagation();
} else {
// window.event.stopPropagation(); // howto on IE8?
}
},
onWindowClick: function () {
if (this.bHasFocus) {
this.bHasFocus = false;
this.cpcAreaBox.style.background = "";
}
},
getXpos: function () {
return this.xPos;
},
getYpos: function () {
return this.yPos;
},
fillMyRect: function (x, y, iWidth, iHeight, iPen) {
var iCanvasWidth = this.iWidth,
dataset8 = this.dataset8,
col, row, idx;
for (row = 0; row < iHeight; row += 1) {
for (col = 0; col < iWidth; col += 1) {
idx = (x + col) + (y + row) * iCanvasWidth;
dataset8[idx] = iPen;
}
}
},
fillTextBox: function (iLeft, iTop, iWidth, iHeight, iPen) {
var iCharWidth = this.oModeData.iPixelWidth * 8,
iCharHeight = this.oModeData.iPixelHeight * 8;
this.fillMyRect(iLeft * iCharWidth, iTop * iCharHeight, iWidth * iCharWidth, iHeight * iCharHeight, iPen);
this.clearTextBufferBox(iLeft, iTop, iWidth, iHeight);
this.setNeedUpdate();
},
moveMyRectUp: function (x, y, iWidth, iHeight, x2, y2) { // for scrolling up (overlap)
var iCanvasWidth = this.iWidth,
dataset8 = this.dataset8,
col, row, idx1, idx2;
for (row = 0; row < iHeight; row += 1) {
idx1 = x + (y + row) * iCanvasWidth;
idx2 = x2 + (y2 + row) * iCanvasWidth;
for (col = 0; col < iWidth; col += 1) {
dataset8[idx2 + col] = dataset8[idx1 + col];
}
}
},
moveMyRectDown: function (x, y, iWidth, iHeight, x2, y2) { // for scrolling down (overlap)
var iCanvasWidth = this.iWidth,
dataset8 = this.dataset8,
col, row, idx1, idx2;
for (row = iHeight - 1; row >= 0; row -= 1) {
idx1 = x + (y + row) * iCanvasWidth;
idx2 = x2 + (y2 + row) * iCanvasWidth;
for (col = 0; col < iWidth; col += 1) {
dataset8[idx2 + col] = dataset8[idx1 + col];
}
}
},
invertChar: function (x, y, iPen, iPaper) {
var iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iPenXorPaper = iPen ^ iPaper, // eslint-disable-line no-bitwise
iGColMode = 0,
row, col, iTestPen;
for (row = 0; row < 8; row += 1) {
for (col = 0; col < 8; col += 1) {
iTestPen = this.testSubPixel(x + col * iPixelWidth, y + row * iPixelHeight);
iTestPen ^= iPenXorPaper; // eslint-disable-line no-bitwise
this.setSubPixels(x + col * iPixelWidth, y + row * iPixelHeight, iTestPen, iGColMode);
}
}
},
setChar: function (iChar, x, y, iPen, iPaper, bTransparent, iGColMode, bTextAtGraphics) {
var aCharData = this.oCustomCharset[iChar] || this.aCharset[iChar],
iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iBit, iPenOrPaper,
iCharData, row, col;
for (row = 0; row < 8; row += 1) {
for (col = 0; col < 8; col += 1) {
iCharData = aCharData[row];
iBit = iCharData & (0x80 >> col); // eslint-disable-line no-bitwise
if (!(bTransparent && !iBit)) { // do not set background pixel in transparent mode
iPenOrPaper = (iBit) ? iPen : iPaper;
if (bTextAtGraphics) {
this.setPixel(x + col * iPixelWidth, y - row * iPixelHeight, iPenOrPaper, iGColMode);
} else { // text mode
this.setSubPixels(x + col * iPixelWidth, y + row * iPixelHeight, iPenOrPaper, iGColMode); // iColMode always 0 in text mode
}
}
}
}
},
readCharData: function (x, y, iExpectedPen) {
var aCharData = [],
iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iPen, iCharData, row, col;
for (row = 0; row < 8; row += 1) {
iCharData = 0;
for (col = 0; col < 8; col += 1) {
iPen = this.testSubPixel(x + col * iPixelWidth, y + row * iPixelHeight);
if (iPen === iExpectedPen) {
iCharData |= (0x80 >> col); // eslint-disable-line no-bitwise
}
}
aCharData[row] = iCharData;
}
return aCharData;
},
setSubPixels: function (x, y, iGPen, iGColMode) {
var iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iWidth = this.iWidth,
row, col, i;
/* eslint-disable no-bitwise */
x &= ~(iPixelWidth - 1); // match CPC pixel
y &= ~(iPixelHeight - 1);
for (row = 0; row < iPixelHeight; row += 1) {
i = x + iWidth * (y + row);
for (col = 0; col < iPixelWidth; col += 1) {
switch (iGColMode) {
case 0: // normal
this.dataset8[i] = iGPen;
break;
case 1: // xor
this.dataset8[i] ^= iGPen;
break;
case 2: // and
this.dataset8[i] &= iGPen;
break;
case 3: // or
this.dataset8[i] |= iGPen;
break;
default:
Utils.console.warn("setSubPixels: Unknown colMode:", iGColMode);
break;
}
i += 1;
}
}
/* eslint-enable no-bitwise */
},
setPixel: function (x, y, iGPen, iGColMode) {
x += this.xOrig;
y = this.iHeight - 1 - (y + this.yOrig);
if (x < this.xLeft || x > this.xRight || y < (this.iHeight - 1 - this.yTop) || y > (this.iHeight - 1 - this.yBottom)) {
return; // not in graphics window
}
this.setSubPixels(x, y, iGPen, iGColMode);
},
setPixelOriginIncluded: function (x, y, iGPen, iGColMode) {
if (x < this.xLeft || x > this.xRight || y < (this.iHeight - 1 - this.yTop) || y > (this.iHeight - 1 - this.yBottom)) {
return; // not in graphics window
}
this.setSubPixels(x, y, iGPen, iGColMode);
},
testSubPixel: function (x, y) {
var i, iPen;
i = x + this.iWidth * y;
iPen = this.dataset8[i];
return iPen;
},
testPixel: function (x, y) {
var i, iPen;
x += this.xOrig;
y = this.iHeight - 1 - (y + this.yOrig);
if (x < this.xLeft || x > this.xRight || y < (this.iHeight - 1 - this.yTop) || y > (this.iHeight - 1 - this.yBottom)) {
return this.iGPaper; // not in graphics window => return graphics paper
}
i = x + this.iWidth * y;
iPen = this.dataset8[i];
return iPen;
},
getByte: function (iAddr) {
var iMode = this.iMode,
iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iByte = null, // null=cannot read
x, y, iGPen, i;
/* eslint-disable no-bitwise */
x = ((iAddr & 0x7ff) % 80) * 8;
y = (((iAddr & 0x3800) / 0x800) + (((iAddr & 0x7ff) / 80) | 0) * 8) * iPixelHeight;
if (y < this.iHeight) { // only if in visible range
if (iMode === 0) {
iGPen = this.dataset8[x + this.iWidth * y];
iByte = ((iGPen >> 2) & 0x02) | ((iGPen << 3) & 0x20) | ((iGPen << 2) & 0x08) | ((iGPen << 7) & 0x80); // b1,b5,b3,b7 (left pixel)
iGPen = this.dataset8[x + iPixelWidth + this.iWidth * y];
iByte |= ((iGPen >> 3) & 0x01) | ((iGPen << 2) & 0x10) | ((iGPen << 1) & 0x04) | ((iGPen << 6) & 0x40); // b0,b4,b2,b6 (right pixel)
} else if (iMode === 1) {
iByte = 0;
iGPen = this.dataset8[x + this.iWidth * y];
iByte |= ((iGPen & 0x02) << 2) | ((iGPen & 0x01) << 7); // b3,b7 (left pixel 1)
iGPen = this.dataset8[x + iPixelWidth + this.iWidth * y];
iByte |= ((iGPen & 0x02) << 1) | ((iGPen & 0x01) << 6); // b2,b6 (pixel 2)
iGPen = this.dataset8[x + iPixelWidth * 2 + this.iWidth * y];
iByte |= ((iGPen & 0x02) << 0) | ((iGPen & 0x01) << 5); // b1,b5 (pixel 3)
iGPen = this.dataset8[x + iPixelWidth * 3 + this.iWidth * y];
iByte |= ((iGPen & 0x02) >> 1) | ((iGPen & 0x01) << 4); // b0,b4 (right pixel 4)
} else if (iMode === 2) {
iByte = 0;
for (i = 0; i <= 7; i += 1) {
iGPen = this.dataset8[x + i + this.iWidth * y];
iByte |= (iGPen & 0x01) << (7 - i);
}
} else { // iMode === 3
}
}
/* eslint-enable no-bitwise */
return iByte;
},
setByte: function (iAddr, iByte) {
var iMode = this.iMode,
iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iGColMode = 0, // always 0
x, y, iGPen, i;
/* eslint-disable no-bitwise */
x = ((iAddr & 0x7ff) % 80) * 8;
y = (((iAddr & 0x3800) / 0x800) + (((iAddr & 0x7ff) / 80) | 0) * 8) * iPixelHeight;
if (y < this.iHeight) { // only if in visible range
if (iMode === 0) {
iGPen = ((iByte << 2) & 0x08) | ((iByte >> 3) & 0x04) | ((iByte >> 2) & 0x02) | ((iByte >> 7) & 0x01); // b1,b5,b3,b7 (left pixel)
this.setSubPixels(x, y, iGPen, iGColMode);
iGPen = ((iByte << 3) & 0x08) | ((iByte >> 2) & 0x04) | ((iByte >> 1) & 0x02) | ((iByte >> 6) & 0x01); // b0,b4,b2,b6 (right pixel)
this.setSubPixels(x + iPixelWidth, y, iGPen, iGColMode);
this.setNeedUpdate();
} else if (iMode === 1) {
iGPen = ((iByte >> 2) & 0x02) | ((iByte >> 7) & 0x01); // b3,b7 (left pixel 1)
this.setSubPixels(x, y, iGPen, iGColMode);
iGPen = ((iByte >> 1) & 0x02) | ((iByte >> 6) & 0x01); // b2,b6 (pixel 2)
this.setSubPixels(x + iPixelWidth, y, iGPen, iGColMode);
iGPen = ((iByte >> 0) & 0x02) | ((iByte >> 5) & 0x01); // b1,b5 (pixel 3)
this.setSubPixels(x + iPixelWidth * 2, y, iGPen, iGColMode);
iGPen = ((iByte << 1) & 0x02) | ((iByte >> 4) & 0x01); // b0,b4 (right pixel 4)
this.setSubPixels(x + iPixelWidth * 3, y, iGPen, iGColMode);
this.setNeedUpdate();
} else if (iMode === 2) {
for (i = 0; i <= 7; i += 1) {
iGPen = (iByte >> (7 - i)) & 0x01;
this.setSubPixels(x + i * iPixelWidth, y, iGPen, iGColMode);
}
this.setNeedUpdate();
} else { // iMode === 3 (not supported)
}
}
/* eslint-enable no-bitwise */
},
// https://de.wikipedia.org/wiki/Bresenham-Algorithmus
drawBresenhamLine: function (xstart, ystart, xend, yend) {
var iPixelWidth = this.oModeData.iPixelWidth,
iPixelHeight = this.oModeData.iPixelHeight,
iGPen = this.iGPen,
iGPaper = this.iGPaper,
iMask = this.iMask,
iMaskBit = this.iMaskBit,
iMaskFirst = this.iMaskFirst,
iGColMode = this.iGColMode,
bTransparent = this.bGTransparent,
x, y, t, dx, dy, incx, incy, pdx, pdy, ddx, ddy, deltaslowdirection, deltafastdirection, err, iBit;
// we have to add origin before modifying coordinates to match CPC pixel
xstart += this.xOrig;
ystart = this.iHeight - 1 - (ystart + this.yOrig);
xend += this.xOrig;
yend = this.iHeight - 1 - (yend + this.yOrig);
/* eslint-disable no-bitwise */
if (xend >= xstart) { // line from left to right
xend |= (iPixelWidth - 1); // match CPC pixel
} else { // line from right to left
xstart |= (iPixelWidth - 1);
}
if (yend >= ystart) { // line from bottom to top
yend |= (iPixelHeight - 1);
} else { // line from top to bottom
ystart |= (iPixelHeight - 1);
}
dx = ((xend - xstart) / iPixelWidth) | 0;
dy = ((yend - ystart) / iPixelHeight) | 0;
/* eslint-enable no-bitwise */
incx = Math.sign(dx) * iPixelWidth;
incy = Math.sign(dy) * iPixelHeight;
if (dx < 0) {
dx = -dx;
}
if (dy < 0) {
dy = -dy;
}
if (dx > dy) {
pdx = incx;
pdy = 0;
ddx = incx;
ddy = incy;
deltaslowdirection = dy;
deltafastdirection = dx;
} else {
pdx = 0;
pdy = incy;
ddx = incx;
ddy = incy;
deltaslowdirection = dx;
deltafastdirection = dy;
}
x = xstart;
y = ystart;
err = deltafastdirection >> 1; // eslint-disable-line no-bitwise
if (iMaskFirst) { // draw first pixel?
iBit = iMask & iMaskBit; // eslint-disable-line no-bitwise
if (!(bTransparent && !iBit)) { // do not set background pixel in transparent mode
this.setPixelOriginIncluded(x, y, iBit ? iGPen : iGPaper, iGColMode); // we expect integers
}
// rotate bitpos right
iMaskBit = (iMaskBit >> 1) | ((iMaskBit << 7) & 0xff); // eslint-disable-line no-bitwise
}
for (t = 0; t < deltafastdirection; t += 1) {
err -= deltaslowdirection;
if (err < 0) {
err += deltafastdirection;
x += ddx;
y += ddy;
} else {
x += pdx;
y += pdy;
}
iBit = iMask & iMaskBit; // eslint-disable-line no-bitwise
if (!(bTransparent && !iBit)) { // do not set background pixel in transparent mode
this.setPixelOriginIncluded(x, y, iBit ? iGPen : iGPaper, iGColMode); // we expect integers
}
// rotate bitpos right
iMaskBit = (iMaskBit >> 1) | ((iMaskBit << 7) & 0xff); // eslint-disable-line no-bitwise
}
this.iMaskBit = iMaskBit;
},
draw: function (x, y) {
var xStart = this.xPos,
yStart = this.yPos;
this.move(x, y); // destination, round values
this.drawBresenhamLine(xStart, yStart, this.xPos, this.yPos);
this.setNeedUpdate();
},
drawr: function (x, y) {
x += this.xPos;
y += this.yPos;
this.draw(x, y);
},
move: function (x, y) {
this.xPos = x; // must be integer
this.yPos = y;
},
mover: function (x, y) {
x += this.xPos;
y += this.yPos;
this.move(x, y);
},
plot: function (x, y) {
this.move(x, y);
this.setPixel(x, y, this.iGPen, this.iGColMode); // must be integer
this.setNeedUpdate();
},
plotr: function (x, y) {
x += this.xPos;
y += this.yPos;
this.plot(x, y);
},
test: function (x, y) {
this.move(x, y);
return this.testPixel(this.xPos, this.yPos); // use rounded values
},
testr: function (x, y) {
x += this.xPos;
y += this.yPos;
return this.test(x, y);
},
setInk: function (iPen, iInk1, iInk2) {
var bNeedInkUpdate = false;
if (this.aCurrentInks[0][iPen] !== iInk1) {
this.aCurrentInks[0][iPen] = iInk1;
bNeedInkUpdate = true;
}
if (this.aCurrentInks[1][iPen] !== iInk2) {
this.aCurrentInks[1][iPen] = iInk2;
bNeedInkUpdate = true;
}
if (bNeedInkUpdate) {
this.updateColorMap();
this.setNeedUpdate(); // we need to notify that an update is needed
}
return bNeedInkUpdate;
},
setBorder: function (iInk1, iInk2) {
var bNeedInkUpdate = this.setInk(16, iInk1, iInk2);
if (bNeedInkUpdate) {
this.canvas.style.borderColor = this.aColors[this.aCurrentInks[this.iInkSet][16]];
}
},
setGPen: function (iGPen) {
iGPen %= this.oModeData.iPens; // limit pens
this.iGPen = iGPen;
},
setGPaper: function (iGPaper) {
iGPaper %= this.oModeData.iPens; // limit pens
this.iGPaper = iGPaper;
},
setGTransparentMode: function (bTransparent) {
this.bGTransparent = bTransparent;
},
printGChar: function (iChar) {
var iCharWidth = this.oModeData.iPixelWidth * 8;
if (iChar >= this.aCharset.length) {
Utils.console.warn("printGChar: Ignoring char with code", iChar);
return;
}
this.setChar(iChar, this.xPos, this.yPos, this.iGPen, this.iGPaper, this.bGTransparent, this.iGColMode, true);
this.xPos += iCharWidth;
this.setNeedUpdate();
},
clearTextBufferBox: function (iLeft, iTop, iWidth, iHeight) {
var aTextBuffer = this.aTextBuffer,
x, y, aTextBufferRow;
for (y = iTop; y < iTop + iHeight; y += 1) {
aTextBufferRow = aTextBuffer[y];
if (aTextBufferRow) {
for (x = iLeft; x < iLeft + iWidth; x += 1) {
delete aTextBufferRow[x];
}
}
}
this.setNeedTextUpdate();