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Implement arithmetic coding with 12-bit precision

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This actually works and apparently always has worked.  It only failed
because the libjpeg code, which did not originally support arithmetic
coding, assumed that optimize_coding should always be TRUE for 12-bit
data precision.
This commit is contained in:
DRC
2023-01-26 13:11:58 -06:00
parent fc01f4673b
commit 96bc40c1b3
19 changed files with 68 additions and 52 deletions
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11
java/org/libjpegturbo/turbojpeg/TJ.java
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@@ -465,7 +465,8 @@ public final class TJ {
* <li> <code>8</code>, <code>12</code>, or <code>16</code>
* </ul>
*
* <p>12-bit data precision implies {@link #PARAM_OPTIMIZE}.
* <p>12-bit data precision implies {@link #PARAM_OPTIMIZE} unless
* {@link #PARAM_ARITHMETIC} is set.
*/
public static final int PARAM_PRECISION = 7;
/**
@@ -559,8 +560,9 @@ public final class TJ {
*
* <p>Progressive entropy coding will generally improve compression relative
* to baseline entropy coding, but it will reduce compression and
* decompression performance considerably. Implies {@link #PARAM_OPTIMIZE}.
* Can be combined with {@link #PARAM_ARITHMETIC}.
* decompression performance considerably. Can be combined with
* {@link #PARAM_ARITHMETIC}. Implies {@link #PARAM_OPTIMIZE} unless
* {@link #PARAM_ARITHMETIC} is also set.
*/
public static final int PARAM_PROGRESSIVE = 12;
/**
@@ -601,8 +603,7 @@ public final class TJ {
* <p>Arithmetic entropy coding will generally improve compression relative
* to Huffman entropy coding, but it will reduce compression and
* decompression performance considerably. Can be combined with
* {@link #PARAM_PROGRESSIVE}. Arithmetic entropy coding is currently only
* implemented for 8-bit samples.
* {@link #PARAM_PROGRESSIVE}.
*/
public static final int PARAM_ARITHMETIC = 14;
/**