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Copy pathimage.ts
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Copy pathimage.ts
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314 lines (285 loc) · 9.61 KB
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import { BdfFont, Glyph } from "./bdffont";
import { wrapText } from "./textwrap";
export const G2_LENS_WIDTH = 640;
export const G2_LENS_HEIGHT = 480;
const DEFAULT_CORNER_RADIUS = 8;
export function imageFromAsciiArt(lines: readonly string[], value = 255): GrayImage {
const width = Math.max(0, ...lines.map((line) => line.length));
const image = new GrayImage(width, lines.length, 0);
const fill = clampByte(value);
for (let y = 0; y < lines.length; y++) {
const line = lines[y]!;
for (let x = 0; x < line.length; x++) {
const pixel = line[x];
if (pixel && pixel !== " " && pixel !== ".") {
image.pixels[y * width + x] = fill;
}
}
}
return image;
}
export class GrayImage {
readonly width: number;
readonly height: number;
readonly pixels: Uint8Array;
constructor(width: number, height: number, fill = 0) {
this.width = width;
this.height = height;
this.pixels = new Uint8Array(width * height);
this.clear(fill);
}
clone(): GrayImage {
const clone = new GrayImage(this.width, this.height, 0);
clone.pixels.set(this.pixels);
return clone;
}
clear(value = 0): void {
this.pixels.fill(clampByte(value));
}
setPixel(x: number, y: number, value: number): void {
this.setPixelUnchecked(x, y, clampByte(value));
}
private setPixelUnchecked(x: number, y: number, value: number): void {
if (x < 0 || y < 0 || x >= this.width || y >= this.height) return;
this.pixels[y * this.width + x] = value;
}
getPixel(x: number, y: number): number {
if (x < 0 || y < 0 || x >= this.width || y >= this.height) return 0;
return this.pixels[y * this.width + x] ?? 0;
}
fillRect(x: number, y: number, width: number, height: number, value: number): void {
const left = Math.max(0, x | 0);
const top = Math.max(0, y | 0);
const right = Math.min(this.width, (x + width) | 0);
const bottom = Math.min(this.height, (y + height) | 0);
const fill = clampByte(value);
for (let row = top; row < bottom; row++) {
const offset = row * this.width;
for (let col = left; col < right; col++) {
this.pixels[offset + col] = fill;
}
}
}
drawRect(x: number, y: number, width: number, height: number, value: number): void {
this.drawLine(x, y, x + width - 1, y, value);
this.drawLine(x, y, x, y + height - 1, value);
this.drawLine(x + width - 1, y, x + width - 1, y + height - 1, value);
this.drawLine(x, y + height - 1, x + width - 1, y + height - 1, value);
}
drawLine(x0: number, y0: number, x1: number, y1: number, value: number): void {
let ax = Math.round(x0);
let ay = Math.round(y0);
const bx = Math.round(x1);
const by = Math.round(y1);
const stroke = clampByte(value);
const dx = Math.abs(bx - ax);
const sx = ax < bx ? 1 : -1;
const dy = -Math.abs(by - ay);
const sy = ay < by ? 1 : -1;
let err = dx + dy;
while (true) {
this.setPixelUnchecked(ax, ay, stroke);
if (ax === bx && ay === by) break;
const e2 = 2 * err;
if (e2 >= dy) {
err += dy;
ax += sx;
}
if (e2 <= dx) {
err += dx;
ay += sy;
}
}
}
drawText(font: BdfFont, x: number, y: number, text: string, value: number): void {
let cursorX = x;
const fill = clampByte(value);
for (const char of text) {
if (char === "\n") {
cursorX = x;
y += font.lineHeight;
continue;
}
const glyph = font.getGlyph(char.codePointAt(0) ?? 32);
if (!glyph) continue;
this.drawGlyph(font, glyph, cursorX, y, fill);
cursorX += glyph.dwidthX;
}
}
drawTextWrapped({font, x, y, width, text, value }: {
font: BdfFont;
x: number;
y: number;
width: number;
text: string;
value: number;
}): void {
const lines = wrapText(font, text, width);
for (let i = 0; i < lines.length; i++) {
this.drawText(font, x, y + i * font.lineHeight, lines[i]!, value);
}
}
bitBlt(
source: GrayImage,
dx: number,
dy: number,
opts: {
sx?: number;
sy?: number;
width?: number;
height?: number;
/** Skip source pixels with value 0 (color-key transparency). */
transparentZero?: boolean;
} = {},
): void {
const srcX = Math.max(0, (opts.sx ?? 0) | 0);
const srcY = Math.max(0, (opts.sy ?? 0) | 0);
const copyWidth = Math.max(0, (opts.width ?? (source.width - srcX)) | 0);
const copyHeight = Math.max(0, (opts.height ?? (source.height - srcY)) | 0);
const destX = dx | 0;
const destY = dy | 0;
for (let row = 0; row < copyHeight; row++) {
const sy = srcY + row;
const ty = destY + row;
if (sy < 0 || sy >= source.height || ty < 0 || ty >= this.height) continue;
for (let col = 0; col < copyWidth; col++) {
const sx = srcX + col;
const tx = destX + col;
if (sx < 0 || sx >= source.width || tx < 0 || tx >= this.width) continue;
const value = source.pixels[sy * source.width + sx] ?? 0;
if (opts.transparentZero && value === 0) continue;
this.pixels[ty * this.width + tx] = value;
}
}
}
fillRoundedRect(
x: number,
y: number,
width: number,
height: number,
value: number,
radius = DEFAULT_CORNER_RADIUS,
): void {
const left = x | 0;
const top = y | 0;
const rectWidth = width | 0;
const rectHeight = height | 0;
const bottom = top + rectHeight;
const fill = clampByte(value);
for (let row = top; row < bottom; row++) {
if (row < 0 || row >= this.height) continue;
const span = roundedRectRowSpan(row, left, top, rectWidth, rectHeight, radius);
if (!span) continue;
const start = Math.max(0, span.left);
const end = Math.min(this.width, span.right);
const offset = row * this.width;
for (let col = start; col < end; col++) {
this.pixels[offset + col] = fill;
}
}
}
drawRoundedRect(
x: number,
y: number,
width: number,
height: number,
value: number,
radius = DEFAULT_CORNER_RADIUS,
): void {
const left = x | 0;
const top = y | 0;
const rectWidth = width | 0;
const rectHeight = height | 0;
const bottom = top + rectHeight;
const stroke = clampByte(value);
const innerLeft = left + 1;
const innerTop = top + 1;
const innerWidth = rectWidth - 2;
const innerHeight = rectHeight - 2;
for (let row = top; row < bottom; row++) {
if (row < 0 || row >= this.height) continue;
const outer = roundedRectRowSpan(row, left, top, rectWidth, rectHeight, radius);
if (!outer) continue;
const inner =
innerWidth > 0 && innerHeight > 0
? roundedRectRowSpan(row, innerLeft, innerTop, innerWidth, innerHeight, Math.max(0, radius - 1))
: undefined;
const offset = row * this.width;
const outerLeft = Math.max(0, outer.left);
const outerRight = Math.min(this.width, outer.right);
if (!inner) {
for (let col = outerLeft; col < outerRight; col++) {
this.pixels[offset + col] = stroke;
}
continue;
}
const innerLeftClamped = Math.max(outerLeft, Math.min(outerRight, inner
7AED
.left));
const innerRightClamped = Math.max(outerLeft, Math.min(outerRight, inner.right));
for (let col = outerLeft; col < innerLeftClamped; col++) {
this.pixels[offset + col] = stroke;
}
for (let col = innerRightClamped; col < outerRight; col++) {
this.pixels[offset + col] = stroke;
}
}
}
fingerprint(): string {
let hash = 2166136261;
for (let i = 0; i < this.pixels.length; i++) {
hash ^= this.pixels[i]!;
hash = Math.imul(hash, 16777619);
}
return `fnv:${(hash >>> 0).toString(16)}`;
}
/**
* Snapshot of the full image as a single 8-bit-per-pixel grayscale buffer,
* row-major and top-to-bottom. The Java side turns this into whatever wire
* format the firmware currently expects (today: a 4bpp BMP), so all framing
* concerns stay on one side of the bridge.
*/
to8bppBuffer(): Uint8Array {
return Uint8Array.from(this.pixels);
}
private drawGlyph(font: BdfFont, glyph: Glyph, x: number, y: number, value: number): void {
const baselineY = y + font.ascent;
const top = baselineY - (glyph.bbxHeight + glyph.bbxY);
const left = x + glyph.bbxX;
const rowBitWidth = ((glyph.bbxWidth + 7) >> 3) << 3;
for (let row = 0; row < glyph.bbxHeight; row++) {
const bits = glyph.bitmapRows[row] ?? 0;
for (let col = 0; col < glyph.bbxWidth; col++) {
const shift = rowBitWidth - 1 - col;
if (((bits >> shift) & 1) !== 0) {
this.setPixelUnchecked(left + col, top + row, value);
}
}
}
}
}
function clampByte(value: number): number {
return Math.max(0, Math.min(255, Math.round(value)));
}
function roundedRectRowSpan(
row: number,
x: number,
y: number,
width: number,
height: number,
radius: number,
): { left: number; right: number } | undefined {
if (width <= 0 || height <= 0 || row < y || row >= y + height) return undefined;
const r = Math.max(0, Math.min(radius | 0, (width / 2) | 0, (height / 2) | 0));
if (r === 0) return { left: x, right: x + width };
const cy = row + 0.5;
const topCornerBottom = y + r;
const bottomCornerTop = y + height - r;
if (cy >= topCornerBottom && cy < bottomCornerTop) {
return { left: x, right: x + width };
}
const cornerY = cy < topCornerBottom ? topCornerBottom : bottomCornerTop;
const dy = cy - cornerY;
const dxSquared = r * r - dy * dy;
if (dxSquared < 0) return undefined;
const inset = (r - Math.sqrt(dxSquared) + 0.5) | 0;
return { left: x + inset, right: x + width - inset };
}