apple2js/js/canvas.ts

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import { byte, Color, memory, MemoryPages, rom } from './types';
import { allocMemPages } from './util';
import {
GraphicsState,
HiresPage,
LoresPage,
Region,
VideoModes,
VideoModesState,
bank,
pageNo
} from './videomodes';
const dim = (c: Color): Color => {
return [
c[0] * 0.75 & 0xff,
c[1] * 0.75 & 0xff,
c[2] * 0.75 & 0xff
];
};
// hires colors
const orangeCol: Color = [255, 106, 60];
const greenCol: Color = [20, 245, 60];
const blueCol: Color = [20, 207, 253];
const violetCol: Color = [255, 68, 253];
const whiteCol: Color = [255, 255, 255];
const blackCol: Color = [0, 0, 0];
// lores colors
const _colors: Color[] = [
[0, 0, 0], // 0x0 black
[227, 30, 96], // 0x1 deep red
[96, 78, 189], // 0x2 dark blue
[255, 68, 253], // 0x3 purple
[0, 163, 96], // 0x4 dark green
[156, 156, 156], // 0x5 dark gray
[20, 207, 253], // 0x6 medium blue
[208, 195, 255], // 0x7 light blue
[96, 114, 3], // 0x8 brown
[255, 106, 60], // 0x9 orange
[156, 156, 156], // 0xa light gray
[255, 160, 208], // 0xb pink
[20, 245, 60], // 0xc green
[208, 221, 141], // 0xd yellow
[114, 255, 208], // 0xe aquamarine
[255, 255, 255], // 0xf white
];
//
const r4 = [
0, // Black
2, // Dark Blue
4, // Dark Green
6, // Medium Blue
8, // Brown
5, // Gray 1
12, // Light Green
14, // Aqua
1, // Red
3, // Purple
10, // Gray 2
7, // Pink
9, // Orange
11, // Light Blue
13, // Yellow
15 // White
] as const;
const dcolors: Color[] = [
[0, 0, 0], // 0x0 black
[227, 30, 96], // 0x1 deep red
[96, 78, 189], // 0x2 dark blue
[255, 68, 253], // 0x3 purple
[0, 163, 96], // 0x4 dark green
[156, 156, 156], // 0x5 dark gray
[20, 207, 253], // 0x6 medium blue
[208, 195, 255], // 0x7 light blue
[96, 114, 3], // 0x8 brown
[255, 106, 60], // 0x9 orange
[156, 156, 156], // 0xa light gray
[255, 160, 208], // 0xb pink
[20, 245, 60], // 0xc green
[208, 221, 141], // 0xd yellow
[114, 255, 208], // 0xe aquamarine
[255, 255, 255], // 0xf white
];
const notDirty: Region = {
top: 193,
bottom: -1,
left: 561,
right: -1
} as const;
/****************************************************************************
*
* Text/Lores Graphics
*
***************************************************************************/
export class LoresPage2D implements LoresPage {
// $00-$3F inverse
// $40-$7F flashing
// $80-$FF normal
private _buffer: memory[] = [];
private _refreshing = false;
private _blink = false;
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private highColorTextMode = false;
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dirty: Region = { ...notDirty };
imageData: ImageData;
constructor(
private vm: VideoModes,
private page: pageNo,
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private readonly charset: rom,
private readonly e: boolean
) {
this.imageData = this.vm.context.createImageData(560, 192);
this.imageData.data.fill(0xff);
this._buffer[0] = allocMemPages(0x4);
this._buffer[1] = allocMemPages(0x4);
this.vm.setLoresPage(page, this);
}
private _drawPixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = c0;
data[off + 1] = data[off + 5] = c1;
data[off + 2] = data[off + 6] = c2;
}
private _drawHalfPixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = c0;
data[off + 1] = c1;
data[off + 2] = c2;
}
private _checkInverse(val: byte) {
let inverse = false;
if (this.e) {
if (!this.vm._80colMode && !this.vm.altCharMode) {
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inverse = ((val & 0xc0) === 0x40) && this._blink;
}
} else {
inverse = !((val & 0x80) || (val & 0x40) && this._blink);
}
return inverse;
}
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bank0(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 0),
write: (page, off, val) => this._write(page, off, val, 0),
};
}
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bank1(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 1),
write: (page, off, val) => this._write(page, off, val, 1),
};
}
// These are used by both bank 0 and 1
private _start() {
return (0x04 * this.page);
}
private _end() { return (0x04 * this.page) + 0x03; }
private _read(page: byte, off: byte, bank: bank) {
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const addr = (page << 8) | off, base = addr & 0x3FF;
return this._buffer[bank][base];
}
private _write(page: byte, off: byte, val: byte, bank: bank) {
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const addr = (page << 8) | off;
const base = addr & 0x3FF;
let fore, back;
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if (this._buffer[bank][base] === val && !this._refreshing) {
return;
}
this._buffer[bank][base] = val;
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const col = (base % 0x80) % 0x28;
const adj = off - col;
// 000001cd eabab000 -> 000abcde
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const ab = (adj & 0x18);
const cd = (page & 0x03) << 1;
const ee = adj >> 7;
const row = ab | cd | ee;
const data = this.imageData.data;
if ((row < 24) && (col < 40)) {
let y = row << 3;
if (y < this.dirty.top) { this.dirty.top = y; }
y += 8;
if (y > this.dirty.bottom) { this.dirty.bottom = y; }
let x = col * 14;
if (x < this.dirty.left) { this.dirty.left = x; }
x += 14;
if (x > this.dirty.right) { this.dirty.right = x; }
if (this.vm.textMode || this.vm.hiresMode || (this.vm.mixedMode && row > 19)) {
if (this.vm._80colMode) {
const inverse = this._checkInverse(val);
fore = inverse ? blackCol : whiteCol;
back = inverse ? whiteCol : blackCol;
if (!this.vm.altCharMode) {
val = (val >= 0x40 && val < 0x80) ? val - 0x40 : val;
}
let offset = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
for (let jdx = 0; jdx < 8; jdx++) {
let b = this.charset[val * 8 + jdx];
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? back : fore;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 553 * 4;
}
} else {
val = this._buffer[0][base];
const inverse = this._checkInverse(val);
fore = inverse ? blackCol : whiteCol;
back = inverse ? whiteCol : blackCol;
if (!this.vm.altCharMode) {
val = (val >= 0x40 && val < 0x80) ? val - 0x40 : val;
}
let offset = (col * 14 + row * 560 * 8) * 4;
if (this.highColorTextMode) {
fore = _colors[this._buffer[1][base] >> 4];
back = _colors[this._buffer[1][base] & 0x0f];
}
if (this.e) {
for (let jdx = 0; jdx < 8; jdx++) {
let b = this.charset[val * 8 + jdx];
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? back : fore;
this._drawPixel(data, offset, color);
b >>= 1;
offset += 8;
}
offset += 546 * 4;
}
} else {
const colorMode = this.vm.mixedMode && !this.vm.textMode && !this.vm.monoMode;
// var val0 = col > 0 ? _buffer[0][base - 1] : 0;
// var val2 = col < 39 ? _buffer[0][base + 1] : 0;
for (let jdx = 0; jdx < 8; jdx++) {
let odd = !(col & 0x1);
let b = this.charset[val * 8 + jdx] << 1;
if (colorMode) {
// var b0 = charset[val0 * 8 + jdx];
// var b2 = charset[val2 * 8 + jdx];
if (inverse) { b ^= 0x1ff; }
}
for (let idx = 0; idx < 7; idx++) {
let color;
if (colorMode) {
if (b & 0x80) {
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if ((b & 0x1c0) !== 0x80) {
color = whiteCol;
} else {
color = odd ? violetCol : greenCol;
}
} else {
color = blackCol;
}
odd = !odd;
} else {
color = (b & 0x80) ? fore : back;
}
this._drawPixel(data, offset, color);
b <<= 1;
offset += 8;
}
offset += 546 * 4;
}
}
}
} else {
if (this.vm._80colMode && !this.vm.an3State) {
let offset = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
if (this.vm.monoMode) {
for (let jdx = 0; jdx < 8; jdx++) {
let b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
b |= (b << 4);
b |= (b << 8);
if (col & 0x1) {
b >>= 2;
}
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? whiteCol : blackCol;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 553 * 4;
}
} else {
if (bank & 0x1) {
val = ((val & 0x77) << 1) | ((val & 0x88) >> 3);
}
for (let jdx = 0; jdx < 8; jdx++) {
const color = _colors[(jdx < 4) ?
(val & 0x0f) : (val >> 4)];
for (let idx = 0; idx < 7; idx++) {
this._drawHalfPixel(data, offset, color);
offset += 4;
}
offset += 553 * 4;
}
}
} else if (bank === 0) {
let offset = (col * 14 + row * 560 * 8) * 4;
if (this.vm.monoMode) {
for (let jdx = 0; jdx < 8; jdx++) {
let b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
b |= (b << 4);
b |= (b << 8);
if (col & 0x1) {
b >>= 2;
}
for (let idx = 0; idx < 14; idx++) {
const color = (b & 0x0001) ? whiteCol : blackCol;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 546 * 4;
}
} else {
for (let jdx = 0; jdx < 8; jdx++) {
const color = _colors[(jdx < 4) ? (val & 0x0f) : (val >> 4)];
for (let idx = 0; idx < 7; idx++) {
this._drawPixel(data, offset, color);
offset += 8;
}
offset += 546 * 4;
}
}
}
}
}
}
refresh() {
this.highColorTextMode = !this.vm.an3State && this.vm.textMode && !this.vm._80colMode;
let addr = 0x400 * this.page;
this._refreshing = true;
for (let idx = 0; idx < 0x400; idx++, addr++) {
this._write(addr >> 8, addr & 0xff, this._buffer[0][idx], 0);
if (this.vm._80colMode) {
this._write(addr >> 8, addr & 0xff, this._buffer[1][idx], 1);
}
}
this._refreshing = false;
}
blink() {
let addr = 0x400 * this.page;
this._refreshing = true;
this._blink = !this._blink;
for (let idx = 0; idx < 0x400; idx++, addr++) {
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const b = this._buffer[0][idx];
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if ((b & 0xC0) === 0x40) {
this._write(addr >> 8, addr & 0xff, this._buffer[0][idx], 0);
}
}
this._refreshing = false;
}
start() {
setInterval(() => this.blink(), 267);
return this._start();
}
end() {
return this._end();
}
read(page: byte, off: byte) {
return this._read(page, off, 0);
}
write(page: byte, off: byte, val: byte) {
return this._write(page, off, val, 0);
}
getState(): GraphicsState {
return {
buffer: [
new Uint8Array(this._buffer[0]),
new Uint8Array(this._buffer[1]),
]
};
}
setState(state: GraphicsState) {
this._buffer[0] = new Uint8Array(state.buffer[0]);
this._buffer[1] = new Uint8Array(state.buffer[1]);
this.refresh();
}
private rowToBase(row: number) {
const ab = (row >> 3) & 3;
const cd = (row >> 1) & 0x3;
const e = row & 1;
return (cd << 8) | (e << 7) | (ab << 5) | (ab << 3);
}
private mapCharCode(charCode: byte) {
charCode &= 0x7F;
if (charCode < 0x20) {
charCode += 0x40;
}
if (!this.e && (charCode >= 0x60)) {
charCode -= 0x40;
}
return charCode;
}
getText() {
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let buffer = '', line, charCode;
let row, col, base;
for (row = 0; row < 24; row++) {
base = this.rowToBase(row);
line = '';
if (this.e && this.vm._80colMode) {
for (col = 0; col < 80; col++) {
charCode = this.mapCharCode(this._buffer[1 - col % 2][base + Math.floor(col / 2)]);
line += String.fromCharCode(charCode);
}
} else {
for (col = 0; col < 40; col++) {
charCode = this.mapCharCode(this._buffer[0][base + col]);
line += String.fromCharCode(charCode);
}
}
line = line.trimRight();
buffer += line + '\n';
}
return buffer;
}
}
/****************************************************************************
*
* Hires Graphics
*
***************************************************************************/
export class HiresPage2D implements HiresPage {
public imageData: ImageData;
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dirty: Region = { ...notDirty };
private _buffer: memory[] = [];
private _refreshing = false;
highColorHGRMode: boolean;
oneSixtyMode: boolean;
mixedDHRMode: boolean;
monoDHRMode: boolean;
colorDHRMode: boolean = true;
constructor(
private vm: VideoModes,
private page: pageNo,
) {
this.imageData = this.vm.context.createImageData(560, 192);
this.imageData.data.fill(0xff);
this._buffer[0] = allocMemPages(0x20);
this._buffer[1] = allocMemPages(0x20);
this.vm.setHiresPage(page, this);
}
private _drawPixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = c0;
data[off + 1] = data[off + 5] = c1;
data[off + 2] = data[off + 6] = c2;
}
private _drawHalfPixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = c0;
data[off + 1] = c1;
data[off + 2] = c2;
}
//
// 160x192 pixels alternate 3 and 4 base pixels wide
//
private _draw3Pixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = data[off + 8] = c0;
data[off + 1] = data[off + 5] = data[off + 9] = c1;
data[off + 2] = data[off + 6] = data[off + 10] = c2;
}
private _draw4Pixel(data: Uint8ClampedArray, off: number, color: Color) {
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const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = data[off + 8] = data[off + 12] = c0;
data[off + 1] = data[off + 5] = data[off + 9] = data[off + 13] = c1;
data[off + 2] = data[off + 6] = data[off + 10] = data[off + 14] = c2;
}
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bank0(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 0),
write: (page, off, val) => this._write(page, off, val, 0),
};
}
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bank1(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 1),
write: (page, off, val) => this._write(page, off, val, 1),
};
}
private _start() { return (0x20 * this.page); }
private _end() { return (0x020 * this.page) + 0x1f; }
private _read(page: byte, off: byte, bank: bank) {
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const addr = (page << 8) | off, base = addr & 0x1FFF;
return this._buffer[bank][base];
}
private _write(page: byte, off: byte, val: byte, bank: bank) {
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const addr = (page << 8) | off;
const base = addr & 0x1FFF;
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if (this._buffer[bank][base] === val && !this._refreshing) {
return;
}
this._buffer[bank][base] = val;
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const col = (base % 0x80) % 0x28;
const adj = off - col;
// 000001cd eabab000 -> 000abcde
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const ab = (adj & 0x18);
const cd = (page & 0x03) << 1;
const e = adj >> 7;
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const rowa = ab | cd | e,
rowb = base >> 10;
const data = this.imageData.data;
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let dx, dy;
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if ((rowa < 24) && (col < 40) && (this.vm.hiresMode || this._refreshing)) {
let y = rowa << 4 | rowb << 1;
if (y < this.dirty.top) { this.dirty.top = y; }
y += 1;
if (y > this.dirty.bottom) { this.dirty.bottom = y; }
let x = col * 14 - 2;
if (x < this.dirty.left) { this.dirty.left = x; }
x += 18;
if (x > this.dirty.right) { this.dirty.right = x; }
dy = rowa << 4 | rowb << 1;
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let bz, b0, b1, b2, b3, b4, c;
if (this.oneSixtyMode && !this.vm.monoMode) {
// 1 byte = two pixels, but 3:4 ratio
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const c3 = val & 0xf;
const c4 = val >> 4;
dx = col * 2 + (bank ^ 1);
const offset = dx * 28 + dy * 280 * 4;
this._draw3Pixel(data, offset, dcolors[c3]);
this._draw4Pixel(data, offset + 12, dcolors[c4]);
} else if (this.vm.doubleHiresMode) {
val &= 0x7f;
// Every 4 bytes is 7 pixels
// 2 bytes per bank
// b0 b1 b2 b3
// c0 c1 c2 c3 c4 c5 c6
// 76543210 76543210 76543210 76543210
// 1111222 2333344 4455556 6667777
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const mod = col % 2, mcol = col - mod, baseOff = base - mod;
bz = this._buffer[0][baseOff - 1];
b0 = this._buffer[1][baseOff];
b1 = this._buffer[0][baseOff];
b2 = this._buffer[1][baseOff + 1];
b3 = this._buffer[0][baseOff + 1];
b4 = this._buffer[1][baseOff + 2];
c = [
0,
((b0 & 0x0f) >> 0), // 0
((b0 & 0x70) >> 4) | ((b1 & 0x01) << 3), // 1
((b1 & 0x1e) >> 1), // 2
((b1 & 0x60) >> 5) | ((b2 & 0x03) << 2), // 3
((b2 & 0x3c) >> 2), // 4
((b2 & 0x40) >> 6) | ((b3 & 0x07) << 1), // 5
((b3 & 0x78) >> 3), // 6
0
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]; // 7
const hb = [
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0,
b0 & 0x80, // 0
b0 & 0x80, // 1
b1 & 0x80, // 2
b2 & 0x80, // 3
b2 & 0x80, // 4
b3 & 0x80, // 5
b3 & 0x80, // 6
0
]; // 7
if (col > 0) {
c[0] = (bz & 0x78) >> 3;
hb[0] = bz & 0x80;
}
if (col < 39) {
c[8] = b4 & 0x0f;
hb[8] = b4 & 0x80;
}
dx = mcol * 14;
let offset = dx * 4 + dy * 280 * 4;
let monoColor = null;
if (this.vm.monoMode || this.monoDHRMode) {
monoColor = whiteCol;
}
for (let idx = 1; idx < 8; idx++) {
const hbs = hb[idx];
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const dcolor = dcolors[r4[c[idx]]];
let bits = c[idx - 1] | (c[idx] << 4) | (c[idx + 1] << 8);
for (let jdx = 0; jdx < 4; jdx++, offset += 4) {
if (monoColor) {
if (bits & 0x10) {
this._drawHalfPixel(data, offset, monoColor);
} else {
this._drawHalfPixel(data, offset, blackCol);
}
} else if (this.mixedDHRMode) {
if (hbs) {
this._drawHalfPixel(data, offset, dcolor);
} else {
if (bits & 0x10) {
this._drawHalfPixel(data, offset, whiteCol);
} else {
this._drawHalfPixel(data, offset, blackCol);
}
}
} else if (this.colorDHRMode) {
this._drawHalfPixel(data, offset, dcolor);
} else if (
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((c[idx] !== c[idx - 1]) && (c[idx] !== c[idx + 1])) &&
(((bits & 0x1c) === 0x1c) ||
((bits & 0x70) === 0x70) ||
((bits & 0x38) === 0x38))
) {
this._drawHalfPixel(data, offset, whiteCol);
} else if (
(bits & 0x38) ||
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(c[idx] === c[idx + 1]) ||
(c[idx] === c[idx - 1])
) {
this._drawHalfPixel(data, offset, dcolor);
} else if (bits & 0x28) {
this._drawHalfPixel(data, offset, dim(dcolor));
} else {
this._drawHalfPixel(data, offset, blackCol);
}
bits >>= 1;
}
}
if (!this._refreshing) {
this._refreshing = true;
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const bb: bank = bank ? 0 : 1;
for (let rr = addr - 1; rr <= addr + 1; rr++) {
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const vv = this._read(rr >> 8, rr & 0xff, bb);
this._write(rr >> 8, rr & 0xff, vv, bb);
}
this._refreshing = false;
}
} else {
val = this._buffer[0][base];
const hbs = val & 0x80;
val &= 0x7f;
dx = col * 14 - 2;
b0 = col > 0 ? this._buffer[0][base - 1] : 0;
b2 = col < 39 ? this._buffer[0][base + 1] : 0;
val |= (b2 & 0x3) << 7;
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let v0 = b0 & 0x20, v1 = b0 & 0x40, v2 = val & 0x1,
odd = !(col & 0x1),
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color;
const oddCol = (hbs ? orangeCol : greenCol);
const evenCol = (hbs ? blueCol : violetCol);
let offset = dx * 4 + dy * 280 * 4;
const monoColor = this.vm.monoMode ? whiteCol : null;
for (let idx = 0; idx < 9; idx++, offset += 8) {
val >>= 1;
if (v1) {
if (monoColor) {
color = monoColor;
} else if (this.highColorHGRMode) {
color = dcolors[this._buffer[1][base] >> 4];
} else if (v0 || v2) {
color = whiteCol;
} else {
color = odd ? oddCol : evenCol;
}
} else {
if (monoColor) {
color = blackCol;
} else if (this.highColorHGRMode) {
color = dcolors[this._buffer[1][base] & 0x0f];
} else if (odd && v2 && v0) {
color = v0 ? dim(evenCol) : evenCol;
} else if (!odd && v0 && v2) {
color = v2 ? dim(oddCol) : oddCol;
} else {
color = blackCol;
}
}
if (dx > -1 && dx < 560) {
this._drawPixel(data, offset, color);
}
dx += 2;
v0 = v1;
v1 = v2;
v2 = val & 0x01;
odd = !odd;
}
}
}
}
refresh() {
this.highColorHGRMode = !this.vm.an3State && this.vm.hiresMode && !this.vm._80colMode;
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this.oneSixtyMode = this.vm.flag === 1 && this.vm.doubleHiresMode;
this.mixedDHRMode = this.vm.flag === 2 && this.vm.doubleHiresMode;
this.monoDHRMode = this.vm.flag === 3 && this.vm.doubleHiresMode;
let addr = 0x2000 * this.page;
this._refreshing = true;
for (let idx = 0; idx < 0x2000; idx++, addr++) {
const page = addr >> 8;
const off = addr & 0xff;
this._write(page, off, this._buffer[0][idx], 0);
if (this.vm._80colMode) {
this._write(page, off, this._buffer[1][idx], 1);
}
}
this._refreshing = false;
}
start() {
return this._start();
}
end() {
return this._end();
}
read(page: byte, off: byte) {
return this._read(page, off, 0);
}
write(page: byte, off: byte, val: byte) {
return this._write(page, off, val, 0);
}
getState(): GraphicsState {
return {
buffer: [
new Uint8Array(this._buffer[0]),
new Uint8Array(this._buffer[1]),
]
};
}
setState(state: GraphicsState) {
this._buffer[0] = new Uint8Array(state.buffer[0]);
this._buffer[1] = new Uint8Array(state.buffer[1]);
this.refresh();
}
}
export class VideoModes2D implements VideoModes {
private _grs: LoresPage[] = [];
private _hgrs: HiresPage[] = [];
private _screenContext: CanvasRenderingContext2D;
private _canvas: HTMLCanvasElement;
private _left: number;
private _top: number;
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private _refreshFlag: boolean = true;
public ready = Promise.resolve();
textMode: boolean;
mixedMode: boolean;
hiresMode: boolean;
pageMode: pageNo;
_80colMode: boolean;
altCharMode: boolean;
an3State: boolean;
doubleHiresMode: boolean;
flag = 0;
monoMode = false;
context: CanvasRenderingContext2D;
constructor(
private screen: HTMLCanvasElement,
private e: boolean
) {
this._canvas = document.createElement('canvas');
const context = this._canvas.getContext('2d');
const screenContext = this.screen.getContext('2d');
if (!context || !screenContext) {
throw new Error('No 2d context');
}
this.context = context;
const { width, height } = { width: 560, height: 192 };
this._canvas.width = width;
this._canvas.height = height;
this._screenContext = screenContext;
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this._screenContext.imageSmoothingEnabled = false;
this._left = (this.screen.width - 560) / 2;
this._top = (this.screen.height - 384) / 2;
}
_refresh() {
this.doubleHiresMode = !this.an3State && this.hiresMode && this._80colMode;
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this._refreshFlag = true;
}
refresh() {
this._refresh();
}
reset() {
this.textMode = true;
this.mixedMode = false;
this.hiresMode = true;
this.pageMode = 1;
this._80colMode = false;
this.altCharMode = false;
this.flag = 0;
this.an3State = true;
this._refresh();
}
setLoresPage(page: pageNo, lores: LoresPage) {
this._grs[page - 1] = lores;
}
setHiresPage(page: pageNo, hires: HiresPage) {
this._hgrs[page - 1] = hires;
}
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getLoresPage(page: pageNo) {
return this._grs[page - 1];
}
getHiresPage(page: pageNo) {
return this._hgrs[page - 1];
}
text(on: boolean) {
const old = this.textMode;
this.textMode = on;
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if (on) {
this.flag = 0;
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}
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if (old !== on) {
this._refresh();
}
}
_80col(on: boolean) {
if (!this.e) { return; }
const old = this._80colMode;
this._80colMode = on;
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if (old !== on) {
this._refresh();
}
}
altChar(on: boolean) {
if (!this.e) { return; }
const old = this.altCharMode;
this.altCharMode = on;
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if (old !== on) {
this._refresh();
}
}
hires(on: boolean) {
const old = this.hiresMode;
this.hiresMode = on;
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if (!on) {
this.flag = 0;
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}
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if (old !== on) {
this._refresh();
}
}
an3(on: boolean) {
if (!this.e) { return; }
const old = this.an3State;
this.an3State = on;
if (on) {
this.flag = ((this.flag << 1) | (this._80colMode ? 0x0 : 0x1)) & 0x3;
}
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if (old !== on) {
this._refresh();
}
}
doubleHires(on: boolean) {
this.an3(!on);
}
mixed(on: boolean) {
const old = this.mixedMode;
this.mixedMode = on;
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if (old !== on) {
this._refresh();
}
}
page(pageNo: pageNo) {
const old = this.pageMode;
this.pageMode = pageNo;
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if (old !== pageNo) {
this._refresh();
}
}
isText() {
return this.textMode;
}
isMixed() {
return this.mixedMode;
}
isPage2() {
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return this.pageMode === 2;
}
isHires() {
return this.hiresMode;
}
isDoubleHires() {
return this.doubleHiresMode;
}
is80Col() {
return this._80colMode;
}
isAltChar() {
return this.altCharMode;
}
buildScreen(mainData: ImageData, mixData?: ImageData | null) {
// TODO(whscullin): - figure out 80 column offset
const { x, y } = this._80colMode ? { x: 0, y: 0 } : { x: 0, y: 0 };
if (mixData) {
this.context.putImageData(mainData, x, y, 0, 0, 560, 160);
this.context.putImageData(mixData, x, y, 0, 160, 560, 32);
} else {
this.context.putImageData(mainData, x, y);
}
return this._canvas;
}
updateImage(
mainData: ImageData,
mainDirty: Region,
mixData?: ImageData | null,
mixDirty?: Region | null
) {
let blitted = false;
if (mainDirty.bottom !== -1 || (mixDirty && mixDirty.bottom !== -1)) {
const imageData = this.buildScreen(mainData, mixData);
this._screenContext.drawImage(
imageData,
0, 0, 560, 192,
this._left, this._top, 560, 384
);
blitted = true;
}
return blitted;
}
blit(altData?: ImageData) {
let blitted = false;
const hgr = this._hgrs[this.pageMode - 1];
const gr = this._grs[this.pageMode - 1];
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if (this._refreshFlag) {
hgr.refresh();
gr.refresh();
this._refreshFlag = false;
}
if (altData) {
blitted = this.updateImage(
altData,
{ top: 0, left: 0, right: 560, bottom: 192 }
);
} else if (this.hiresMode && !this.textMode) {
blitted = this.updateImage(
hgr.imageData,
hgr.dirty,
this.mixedMode ? gr.imageData : null,
this.mixedMode ? gr.dirty : null
);
} else {
blitted = this.updateImage(
gr.imageData, gr.dirty
);
}
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hgr.dirty = { ...notDirty };
gr.dirty = { ...notDirty };
return blitted;
}
getState(): VideoModesState {
return {
grs: [this._grs[0].getState(), this._grs[1].getState()],
hgrs: [this._hgrs[0].getState(), this._hgrs[1].getState()],
textMode: this.textMode,
mixedMode: this.mixedMode,
hiresMode: this.hiresMode,
pageMode: this.pageMode,
_80colMode: this._80colMode,
altCharMode: this.altCharMode,
an3State: this.an3State,
flag: this.flag
};
}
setState(state: VideoModesState) {
this.textMode = state.textMode;
this.mixedMode = state.mixedMode;
this.hiresMode = state.hiresMode;
this.pageMode = state.pageMode;
this._80colMode = state._80colMode;
this.altCharMode = state.altCharMode;
this.an3State = state.an3State;
this.flag = state.flag;
this._grs[0].setState(state.grs[0]);
this._grs[1].setState(state.grs[1]);
this._hgrs[0].setState(state.hgrs[0]);
this._hgrs[1].setState(state.hgrs[1]);
this._refresh();
}
mono(on: boolean) {
if (on) {
this.screen.classList.add('mono');
} else {
this.screen.classList.remove('mono');
}
this.monoMode = on;
this._refresh();
}
scanlines(on: boolean) {
// Can't apply scanline filter to canvas
const parent = this.screen.parentElement;
if (parent) {
if (on) {
parent.classList.add('scanlines');
} else {
parent.classList.remove('scanlines');
}
}
}
getText() {
return this._grs[this.pageMode - 1].getText();
}
}