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TIFF image decoder written entirely in JavaScript
26 lines • 948 B
JavaScript
// Section 14: Differencing Predictor (p. 64)
export function applyHorizontalDifferencing8Bit(data, width, components) {
let i = 0;
while (i < data.length) {
for (let j = components; j < width * components; j += components) {
for (let k = 0; k < components; k++) {
data[i + j + k] =
(data[i + j + k] + data[i + j - (components - k)]) & 255;
}
}
i += width * components;
}
}
export function applyHorizontalDifferencing16Bit(data, width, components) {
let i = 0;
while (i < data.length) {
for (let j = components; j < width * components; j += components) {
for (let k = 0; k < components; k++) {
data[i + j + k] =
(data[i + j + k] + data[i + j - (components - k)]) & 65535;
}
}
i += width * components;
}
}
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