modules/javafx.graphics/src/main/native-iio/libjpeg7/jfdctflt.c

*** 1,10 ****
  /*
   * jfdctflt.c
   *
   * Copyright (C) 1994-1996, Thomas G. Lane.
!  * Modified 2003-2009 by Guido Vollbeding.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains a floating-point implementation of the
   * forward DCT (Discrete Cosine Transform).
--- 1,10 ----
  /*
   * jfdctflt.c
   *
   * Copyright (C) 1994-1996, Thomas G. Lane.
!  * Modified 2003-2017 by Guido Vollbeding.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains a floating-point implementation of the
   * forward DCT (Discrete Cosine Transform).
*** 46,61 ****
  /*
   * This module is specialized to the case DCTSIZE = 8.
   */
  
  #if DCTSIZE != 8
!   Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
  #endif
  
  
  /*
   * Perform the forward DCT on one block of samples.
   */
  
  GLOBAL(void)
  jpeg_fdct_float (FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col)
  {
--- 46,63 ----
  /*
   * This module is specialized to the case DCTSIZE = 8.
   */
  
  #if DCTSIZE != 8
!   Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */
  #endif
  
  
  /*
   * Perform the forward DCT on one block of samples.
+  *
+  * cK represents cos(K*pi/16).
   */
  
  GLOBAL(void)
  jpeg_fdct_float (FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col)
  {
*** 87,97 ****
      tmp10 = tmp0 + tmp3;        /* phase 2 */
      tmp13 = tmp0 - tmp3;
      tmp11 = tmp1 + tmp2;
      tmp12 = tmp1 - tmp2;
  
!     /* Apply unsigned->signed conversion */
      dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */
      dataptr[4] = tmp10 - tmp11;
  
      z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
      dataptr[2] = tmp13 + z1;    /* phase 5 */
--- 89,99 ----
      tmp10 = tmp0 + tmp3;        /* phase 2 */
      tmp13 = tmp0 - tmp3;
      tmp11 = tmp1 + tmp2;
      tmp12 = tmp1 - tmp2;
  
!     /* Apply unsigned->signed conversion. */
      dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */
      dataptr[4] = tmp10 - tmp11;
  
      z1 = (tmp12 + tmp13) * ((FAST_FLOAT) 0.707106781); /* c4 */
      dataptr[2] = tmp13 + z1;    /* phase 5 */