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Assemble and use dataArray for ImageData, make hot-loop faster

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This commit is contained in:
Anthony Kim
2026-01-27 20:25:10 -08:00
parent 15c71e28c8
commit a1c1702508
1 changed files with 12 additions and 11 deletions
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addons/addon-kitty-graphics/src/KittyGraphicsAddon.ts
+12 -11
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@@ -414,22 +414,23 @@ export class KittyGraphicsAddon implements ITerminalAddon, IKittyGraphicsApi {
}
// Convert to RGBA ImageData
const imageData = new ImageData(width, height);
const data = imageData.data;
// TODO: Get this checked by Daniel.
const pixelCount = width * height;
const data = new Uint8ClampedArray(pixelCount * BYTES_PER_PIXEL_RGBA);
const isRgba = format === KittyFormat.RGBA;
for (let i = 0; i < width * height; i++) {
const srcOffset = i * bytesPerPixel;
const dstOffset = i * BYTES_PER_PIXEL_RGBA;
data[dstOffset] = bytes[srcOffset]; // R
let srcOffset = 0;
let dstOffset = 0;
for (let i = 0; i < pixelCount; i++) {
data[dstOffset ] = bytes[srcOffset ]; // R
data[dstOffset + 1] = bytes[srcOffset + 1]; // G
data[dstOffset + 2] = bytes[srcOffset + 2]; // B
data[dstOffset + 3] = format === KittyFormat.RGBA
? bytes[srcOffset + 3] // A from source
: ALPHA_OPAQUE; // Fully opaque for RGB
data[dstOffset + 3] = isRgba ? bytes[srcOffset + 3] : ALPHA_OPAQUE;
srcOffset += bytesPerPixel;
dstOffset += BYTES_PER_PIXEL_RGBA;
}
return createImageBitmap(imageData);
return createImageBitmap(new ImageData(data, width, height));
}
/**