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Extend the TurboJPEG Java API to support compressing JPEG images from YUV planar images

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DRC
2013-10-31 05:04:51 +00:00
parent 98e6ffb50c
commit a7fa97cda5
8 changed files with 282 additions and 44 deletions
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48
java/doc/org/libjpegturbo/turbojpeg/TJCompressor.html
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@@ -298,6 +298,18 @@ TurboJPEG compressor
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/libjpegturbo/turbojpeg/TJCompressor.html#setSourceImageYUV(byte[], int, int, int)">setSourceImageYUV</A></B>(byte[]&nbsp;srcImage,
int&nbsp;width,
int&nbsp;pad,
int&nbsp;height)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Associate an uncompressed YUV planar source image with this compressor
instance.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/libjpegturbo/turbojpeg/TJCompressor.html#setSubsamp(int)">setSubsamp</A></B>(int&nbsp;newSubsamp)</CODE>
<BR>
@@ -462,6 +474,38 @@ setSourceImage</H3>
</DL>
<HR>
<A NAME="setSourceImageYUV(byte[], int, int, int)"><!-- --></A><H3>
setSourceImageYUV</H3>
<PRE>
public void <B>setSourceImageYUV</B>(byte[]&nbsp;srcImage,
int&nbsp;width,
int&nbsp;pad,
int&nbsp;height)
throws java.lang.Exception</PRE>
<DL>
<DD>Associate an uncompressed YUV planar source image with this compressor
instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>srcImage</CODE> - image buffer containing a YUV planar image to be
compressed. The Y, U (Cb), and V (Cr) image planes should be stored
sequentially in the buffer, and the size of each plane is determined by
the specified width, height, and padding, as well as the level of
chrominance subsampling (specified using <A HREF="../../../org/libjpegturbo/turbojpeg/TJCompressor.html#setSubsamp(int)"><CODE>setSubsamp(int)</CODE></A>.) If the
chrominance components are subsampled along the horizontal dimension, then
the width of the luminance plane should be padded to the nearest multiple
of 2 (same goes for the height of the luminance plane, if the chrominance
components are subsampled along the vertical dimension.) This is
irrespective of any additional padding specified in the <code>pad</code>
parameter.<DD><CODE>width</CODE> - width (in pixels) of the source image<DD><CODE>pad</CODE> - the line padding used in the source image. For instance, if
each line in each plane of the YUV image is padded to the nearest multiple
of 4 bytes, then <code>pad</code> should be set to 4.<DD><CODE>height</CODE> - height (in pixels) of the source image
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="setSubsamp(int)"><!-- --></A><H3>
setSubsamp</H3>
<PRE>
@@ -476,6 +520,10 @@ public void <B>setSubsamp</B>(int&nbsp;newSubsamp)
image with little perceptible loss of image clarity (the human eye is more
sensitive to small changes in brightness than to small changes in color.)
This is called "chrominance subsampling".
<p>
NOTE: When compressing a YUV planar image into a JPEG image, this method
also specifies the level of chrominance subsampling used in the source
image.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newSubsamp</CODE> - the new level of chrominance subsampling (one of