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Enhance decodeRect for 16bpp pixel format support 

Modified decodeRect to handle 16bpp raw pixel format decoding with customizable parameters.
This commit is contained in:
Nithish Anand B 2026-01-08 17:37:44 +05:30 committed by GitHub
parent dc19a62112
commit fd4c72eb92
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GPG Key ID: B5690EEEBB952194
1 changed files with 32 additions and 2 deletions
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34
core/decoders/raw.js
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@ -12,7 +12,7 @@ export default class RawDecoder {
this._lines = 0;
}
decodeRect(x, y, width, height, sock, display, depth) {
decodeRect(x, y, width, height, sock, display, depth, pixelFormat) {
if ((width === 0) || (height === 0)) {
return true;
}
@ -21,7 +21,7 @@ export default class RawDecoder {
this._lines = height;
}
const pixelSize = depth == 8 ? 1 : 4;
const pixelSize = depth == 8 ? 1 : (depth == 16 ? 2 : 4); // Modifications
const bytesPerLine = width * pixelSize;
while (this._lines > 0) {
@ -43,6 +43,36 @@ export default class RawDecoder {
newdata[i * 4 + 3] = 255;
}
data = newdata;
} else if (depth == 16) { // Modifications: decode 16bpp raw
const fmt = pixelFormat || {};
const redMax = fmt.redMax !== undefined ? fmt.redMax : 31;
const greenMax = fmt.greenMax !== undefined ? fmt.greenMax : 63;
const blueMax = fmt.blueMax !== undefined ? fmt.blueMax : 31;
const redShift = fmt.redShift !== undefined ? fmt.redShift : 11;
const greenShift = fmt.greenShift !== undefined ? fmt.greenShift : 5;
const blueShift = fmt.blueShift !== undefined ? fmt.blueShift : 0;
const bigEndian = !!fmt.bigEndian;
const newdata = new Uint8Array(width * 4);
for (let i = 0; i < width; i++) {
const idx = i * 2;
let pixel;
if (bigEndian) {
pixel = (data[idx] << 8) | data[idx + 1];
} else {
pixel = data[idx] | (data[idx + 1] << 8);
}
const r = (pixel >> redShift) & redMax;
const g = (pixel >> greenShift) & greenMax;
const b = (pixel >> blueShift) & blueMax;
newdata[i * 4 + 0] = redMax ? (r * 255 / redMax) : 0;
newdata[i * 4 + 1] = greenMax ? (g * 255 / greenMax) : 0;
newdata[i * 4 + 2] = blueMax ? (b * 255 / blueMax) : 0;
newdata[i * 4 + 3] = 255;
}
data = newdata;
}
// Max sure the image is fully opaque