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Add note regarding the fact that 4:4:0 lacks full SIMD support; Add an option for benchmarking 4:4:0 subsampling in TJBench; Wordsmithing; Disable timestamp in generated HTML files to make diffing and merging easier

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1015 632fc199-4ca6-4c93-a231-07263d6284db
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DRC
2013-08-18 10:39:30 +00:00
parent 1f3635c496
commit f82b9f968b
22 changed files with 29 additions and 60 deletions
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21
java/org/libjpegturbo/turbojpeg/TJ.java
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@@ -61,6 +61,7 @@ public final class TJ {
/**
* 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one
* chrominance component for every 1x2 block of pixels in the source image.
* Note that 4:4:0 subsampling is not fully accelerated in libjpeg-turbo.
*/
public static final int SAMP_440 = 4;
@@ -300,21 +301,21 @@ public final class TJ {
public static final int FLAG_FASTUPSAMPLE = 256;
/**
* Use the fastest DCT/IDCT algorithm available in the underlying codec. The
* default if this flag is not specified is implementation-specific. The
* libjpeg implementation, for example, uses the fast algorithm by default
* when compressing, because this has been shown to have only a very slight
* effect on accuracy, but it uses the accurate algorithm when decompressing,
* because this has been shown to have a larger effect.
* default if this flag is not specified is implementation-specific. For
* example, the implementation of TurboJPEG for libjpeg[-turbo] uses the fast
* algorithm by default when compressing, because this has been shown to have
* only a very slight effect on accuracy, but it uses the accurate algorithm
* when decompressing, because this has been shown to have a larger effect.
*/
public static final int FLAG_FASTDCT = 2048;
/**
* Use the most accurate DCT/IDCT algorithm available in the underlying
* codec. The default if this flag is not specified is
* implementation-specific. The libjpeg implementation, for example, uses
* the fast algorithm by default when compressing, because this has been
* shown to have only a very slight effect on accuracy, but it uses the
* accurate algorithm when decompressing, because this has been shown to have
* a larger effect.
* implementation-specific. For example, the implementation of TurboJPEG for
* libjpeg[-turbo] uses the fast algorithm by default when compressing,
* because this has been shown to have only a very slight effect on accuracy,
* but it uses the accurate algorithm when decompressing, because this has
* been shown to have a larger effect.
*/
public static final int FLAG_ACCURATEDCT = 4096;