TurboJPEG: 8-bit lossless JPEG support

java/org/libjpegturbo/turbojpeg/TJ.java

@@ -377,7 +377,7 @@ public final class TJ {
    * The uncompressed source/destination image is stored in bottom-up (Windows,
    * OpenGL) order, not top-down (X11) order.
    */
-  public static final int FLAG_BOTTOMUP      = 2;
+  public static final int FLAG_BOTTOMUP      = (1 << 1);
 
   /**
    * When decompressing an image that was compressed using chrominance
@@ -386,7 +386,7 @@ public final class TJ {
    * creates a smooth transition between neighboring chrominance components in
    * order to reduce upsampling artifacts in the decompressed image.
    */
-  public static final int FLAG_FASTUPSAMPLE  = 256;
+  public static final int FLAG_FASTUPSAMPLE  = (1 << 8);
   /**
    * Use the fastest DCT/IDCT algorithm available in the underlying codec.  The
    * default if this flag is not specified is implementation-specific.  For
@@ -395,7 +395,7 @@ public final class TJ {
    * 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;
+  public static final int FLAG_FASTDCT       = (1 << 11);
   /**
    * Use the most accurate DCT/IDCT algorithm available in the underlying
    * codec.  The default if this flag is not specified is
@@ -405,7 +405,7 @@ public final class TJ {
    * 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;
+  public static final int FLAG_ACCURATEDCT   = (1 << 12);
   /**
    * Immediately discontinue the current compression/decompression/transform
    * operation if the underlying codec throws a warning (non-fatal error).  The
@@ -417,7 +417,7 @@ public final class TJ {
    * with a void return type) will complete and leave the output image in a
    * fully recoverable state after a non-fatal error occurs.
    */
-  public static final int FLAG_STOPONWARNING = 8192;
+  public static final int FLAG_STOPONWARNING = (1 << 13);
   /**
    * Use progressive entropy coding in JPEG images generated by compression and
    * transform operations.  Progressive entropy coding will generally improve
@@ -425,7 +425,7 @@ public final class TJ {
    * reduce compression and decompression performance considerably.  Can be
    * combined with {@link #FLAG_ARITHMETIC}.
    */
-  public static final int FLAG_PROGRESSIVE   = 16384;
+  public static final int FLAG_PROGRESSIVE   = (1 << 14);
   /**
    * Limit the number of progressive JPEG scans that the decompression and
    * transform operations will process.  If a progressive JPEG image contains
@@ -435,7 +435,7 @@ public final class TJ {
    * against an exploit of the progressive JPEG format described in
    * <a href="https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf" target="_blank">this report</a>.
    */
-  public static final int FLAG_LIMITSCANS    = 32768;
+  public static final int FLAG_LIMITSCANS    = (1 << 15);
   /**
    * Use arithmetic entropy coding in JPEG images generated by compression and
    * transform operations.  Arithmetic entropy coding will generally improve
@@ -443,7 +443,25 @@ public final class TJ {
    * reduce compression and decompression performance considerably.  Can be
    * combined with {@link #FLAG_PROGRESSIVE}.
    */
-  public static final int FLAG_ARITHMETIC    = 65536;
+  public static final int FLAG_ARITHMETIC    = (1 << 16);
+  /**
+   * Generate a lossless JPEG image when compressing.  In most cases,
+   * compressing and decompressing lossless JPEG images is considerably slower
+   * than compressing and decompressing lossy JPEG images.  Also note that the
+   * following features are not available with lossless JPEG images:
+   * <ul>
+   * <li> Colorspace conversion
+   * <li> Chrominance subsampling
+   * <li> JPEG quality selection
+   * <li> DCT/IDCT algorithm selection
+   * <li> Progressive entropy coding
+   * <li> Arithmetic entropy coding
+   * <li> Compression from/decompression to YUV planar images
+   * <li> Decompression scaling
+   * <li> Lossless transformations
+   * </ul>
+   */
+  public static final int FLAG_LOSSLESS      = (1 << 17);
 
   /**
    * The number of error codes