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Use 5x5 win & 9 AC coeffs when smoothing DC scans

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... of progressive images.

Based on:
be8d36d13b
9d528f278e
85f36f0765
63a4d39e38
51336a6ad5

Closes #459
Closes #474
This commit is contained in:
DRC
2020-10-05 13:37:44 +02:00
parent d523435e18
commit 6d91e950c8
5 changed files with 240 additions and 65 deletions
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8
jdarith.c
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@@ -4,7 +4,7 @@
* This file was part of the Independent JPEG Group's software:
* Developed 1997-2015 by Guido Vollbeding.
* libjpeg-turbo Modifications:
* Copyright (C) 2015-2019, D. R. Commander.
* Copyright (C) 2015-2020, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
@@ -669,12 +669,14 @@ bad:
&cinfo->coef_bits[cindex + cinfo->num_components][0];
if (cinfo->Ss && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
for (coefi = MIN(cinfo->Ss, 1); coefi <= MAX(cinfo->Se, 9); coefi++) {
if (cinfo->input_scan_number > 1)
prev_coef_bit_ptr[coefi] = coef_bit_ptr[coefi];
}
for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
if (cinfo->Ah != expected)
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
if (cinfo->input_scan_number > 1)
prev_coef_bit_ptr[coefi] = coef_bit_ptr[coefi];
coef_bit_ptr[coefi] = cinfo->Al;
}
}