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support tiff predictor for 16bit

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(for issue #6289)
This does the same for 16 bit as the existing 8 bit tiff predictor code, an addition of the last word to this word.

The last two "& 0xFF" may or may not be needed, I see this isn't done in the 8 bit code, but I'm not a JS developer.
This commit is contained in:
Tilman Hausherr 2017-09-17 18:06:43 +02:00 • committed by unknown
parent c84c23c4cb
commit d75a497a6b
3 changed files with 22 additions and 0 deletions
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13
src/core/stream.js
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@ -735,6 +735,19 @@ var PredictorStream = (function PredictorStreamClosure() {
buffer[pos] = buffer[pos - colors] + rawBytes[i];
pos++;
}
} else if (bits === 16) {
var bytesPerPixel = colors * 2;
for (i = 0; i < bytesPerPixel; ++i) {
buffer[pos++] = rawBytes[i];
}
for (; i < rowBytes; i += 2) {
var sum = ((rawBytes[i] & 0xFF) << 8) +
(rawBytes[i + 1] & 0xFF) +
((buffer[pos - bytesPerPixel] & 0xFF) << 8) +
(buffer[pos - bytesPerPixel + 1] & 0xFF);
buffer[pos++] = ((sum >> 8) & 0xFF);
buffer[pos++] = (sum & 0xFF);
}
} else {
var compArray = new Uint8Array(colors + 1);
var bitMask = (1 << bits) - 1;