Guntis Smaukstelis
35 lines
1.0 KiB
TypeScript
35 lines
1.0 KiB
TypeScript
import { u8ToBits } from '../../../helpers/u8ToBits.js'
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import { MeteoGrid } from '../interfaces.js'
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export function applyBitmask(
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grid: MeteoGrid,
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buffer: Uint8Array,
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bitmask: Uint8Array,
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bytesPerPoint: number,
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): Uint8Array {
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const newBuffer = new Uint8Array(grid.rows * grid.cols * bytesPerPoint)
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let i=0, bufferI=0
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for (; i<bitmask.length; i++) {
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const bits = u8ToBits(bitmask[i])
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for (let bitI=0; bitI<bits.length; bitI++) {
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const newI = (i*8 + bitI) * bytesPerPoint
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if (newI >= newBuffer.length) {
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break;
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}
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if (bits[bitI]) {
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newBuffer[newI] = buffer[bufferI]
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newBuffer[newI+1] = buffer[bufferI+1]
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newBuffer[newI+2] = buffer[bufferI+2]
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bufferI += bytesPerPoint
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} else {
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newBuffer[newI] = 255
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newBuffer[newI+1] = 255
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newBuffer[newI+2] = 255
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}
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}
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}
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return newBuffer
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}
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