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Subtract the X/Y offsets when decoding refinement regions of JBIG2 images (issue 7145, 7308, 7401, 7850, 8270)

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Please refer to the JBIG2 standard, see https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.88-200002-I!!PDF-E&type=items.
In particular, section "6.3.5.3 Fixed templates and adaptive templates" mentions that the offsets should be *subtracted*; where the offsets are defined according to "Table 6" under section "6.3.2 Input parameters".

Fixes 7145.
Fixes 7308.
Fixes 7401.
Fixes 7850.
Fixes 8270.
This commit is contained in:
Jani Pehkonen 2017-04-26 15:47:59 +02:00 • committed by Jonas Jenwald
parent 366277d180
commit 64deb6c700
3 changed files with 10 additions and 2 deletions
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4
src/core/jbig2.js
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@ -394,8 +394,8 @@ var Jbig2Image = (function Jbig2ImageClosure() {
}
}
for (k = 0; k < referenceTemplateLength; k++) {
i0 = i + referenceTemplateY[k] + offsetY;
j0 = j + referenceTemplateX[k] + offsetX;
i0 = i + referenceTemplateY[k] - offsetY;
j0 = j + referenceTemplateX[k] - offsetX;
if (i0 < 0 || i0 >= referenceHeight || j0 < 0 ||
j0 >= referenceWidth) {
contextLabel <<= 1; // out of bound pixel