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TurboJPEG: Add "copy none", progressive xform opts

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Allow progressive entropy coding to be enabled on a
transform-by-transform basis, and implement a new transform option for
disabling the copying of markers.

Closes #153
This commit is contained in:
DRC
2017-06-28 11:43:08 -05:00
parent dedce66eb5
commit dadebcd79a
11 changed files with 169 additions and 22 deletions
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35
doc/html/group___turbo_j_p_e_g.html
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@@ -155,6 +155,12 @@ Macros</h2></td></tr>
<tr class="memitem:gafbf992bbf6e006705886333703ffab31"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___turbo_j_p_e_g.html#gafbf992bbf6e006705886333703ffab31">TJXOPT_NOOUTPUT</a></td></tr>
<tr class="memdesc:gafbf992bbf6e006705886333703ffab31"><td class="mdescLeft">&#160;</td><td class="mdescRight">This option will prevent <a class="el" href="group___turbo_j_p_e_g.html#gad02cd42b69f193a0623a9c801788df3a" title="Losslessly transform a JPEG image into another JPEG image.">tjTransform()</a> from outputting a JPEG image for this particular transform (this can be used in conjunction with a custom filter to capture the transformed DCT coefficients without transcoding them.) <a href="#gafbf992bbf6e006705886333703ffab31">More...</a><br/></td></tr>
<tr class="separator:gafbf992bbf6e006705886333703ffab31"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gad2371c80674584ecc1a7d75e564cf026"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___turbo_j_p_e_g.html#gad2371c80674584ecc1a7d75e564cf026">TJXOPT_PROGRESSIVE</a></td></tr>
<tr class="memdesc:gad2371c80674584ecc1a7d75e564cf026"><td class="mdescLeft">&#160;</td><td class="mdescRight">This option will enable progressive entropy coding in the output image generated by this particular transform. <a href="#gad2371c80674584ecc1a7d75e564cf026">More...</a><br/></td></tr>
<tr class="separator:gad2371c80674584ecc1a7d75e564cf026"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga153b468cfb905d0de61706c838986fe8"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___turbo_j_p_e_g.html#ga153b468cfb905d0de61706c838986fe8">TJXOPT_COPYNONE</a></td></tr>
<tr class="memdesc:ga153b468cfb905d0de61706c838986fe8"><td class="mdescLeft">&#160;</td><td class="mdescRight">This option will prevent <a class="el" href="group___turbo_j_p_e_g.html#gad02cd42b69f193a0623a9c801788df3a" title="Losslessly transform a JPEG image into another JPEG image.">tjTransform()</a> from copying any extra markers (including EXIF and ICC profile data) from the source image to the output image. <a href="#ga153b468cfb905d0de61706c838986fe8">More...</a><br/></td></tr>
<tr class="separator:ga153b468cfb905d0de61706c838986fe8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0aba955473315e405295d978f0c16511"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___turbo_j_p_e_g.html#ga0aba955473315e405295d978f0c16511">TJPAD</a>(width)</td></tr>
<tr class="memdesc:ga0aba955473315e405295d978f0c16511"><td class="mdescLeft">&#160;</td><td class="mdescRight">Pad the given width to the nearest 32-bit boundary. <a href="#ga0aba955473315e405295d978f0c16511">More...</a><br/></td></tr>
<tr class="separator:ga0aba955473315e405295d978f0c16511"><td class="memSeparator" colspan="2">&#160;</td></tr>
@@ -565,6 +571,20 @@ Variables</h2></td></tr>
<p>Compute the scaled value of <code>dimension</code> using the given scaling factor. </p>
<p>This macro performs the integer equivalent of <code>ceil(dimension * scalingFactor)</code>. </p>
</div>
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<a class="anchor" id="ga153b468cfb905d0de61706c838986fe8"></a>
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<td class="memname">#define TJXOPT_COPYNONE</td>
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<p>This option will prevent <a class="el" href="group___turbo_j_p_e_g.html#gad02cd42b69f193a0623a9c801788df3a" title="Losslessly transform a JPEG image into another JPEG image.">tjTransform()</a> from copying any extra markers (including EXIF and ICC profile data) from the source image to the output image. </p>
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@@ -623,6 +643,21 @@ Variables</h2></td></tr>
<p>This option will cause <a class="el" href="group___turbo_j_p_e_g.html#gad02cd42b69f193a0623a9c801788df3a" title="Losslessly transform a JPEG image into another JPEG image.">tjTransform()</a> to return an error if the transform is not perfect. </p>
<p>Lossless transforms operate on MCU blocks, whose size depends on the level of chrominance subsampling used (see <a class="el" href="group___turbo_j_p_e_g.html#ga9e61e7cd47a15a173283ba94e781308c" title="MCU block width (in pixels) for a given level of chrominance subsampling.">tjMCUWidth</a> and <a class="el" href="group___turbo_j_p_e_g.html#gabd247bb9fecb393eca57366feb8327bf" title="MCU block height (in pixels) for a given level of chrominance subsampling.">tjMCUHeight</a>.) If the image's width or height is not evenly divisible by the MCU block size, then there will be partial MCU blocks on the right and/or bottom edges. It is not possible to move these partial MCU blocks to the top or left of the image, so any transform that would require that is "imperfect." If this option is not specified, then any partial MCU blocks that cannot be transformed will be left in place, which will create odd-looking strips on the right or bottom edge of the image. </p>
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<td class="memname">#define TJXOPT_PROGRESSIVE</td>
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<p>This option will enable progressive entropy coding in the output image generated by this particular transform. </p>
<p>Progressive entropy coding will generally improve compression relative to baseline entropy coding (the default), but it will reduce compression and decompression performance considerably. </p>
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doc/html/search/all_74.js
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@@ -77,7 +77,7 @@ var searchData=
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['tjscaled',['TJSCALED',['../group___turbo_j_p_e_g.html#ga84878bb65404204743aa18cac02781df',1,'turbojpeg.h']]],
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