kc3-lang/libjpeg-turbo/src/jdcol565.c

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• Hash : e69dd40c
  Author :
  Date : 2024-01-23T13:26:41
  

  Reorganize source to make things easier to find
  
  - Move all libjpeg documentation, except for README.ijg, into the doc/
    subdirectory.
  
  - Move the TurboJPEG C API documentation from doc/html/ into
    doc/turbojpeg/.
  
  - Move all C source code and headers into a src/ subdirectory.
  
  - Move turbojpeg-jni.c into the java/ subdirectory.
  
  Referring to #226, there is no ideal solution to this problem.  A
  semantically ideal solution would have involved placing all source code,
  including the SIMD and Java source code, under src/ (or perhaps placing
  C library source code under lib/ and C test program source code under
  test/), all header files under include/, and all documentation under
  doc/.  However:
  
  - To me it makes more sense to have separate top-level directories for
    each language, since the SIMD extensions and the Java API are
    technically optional features.  src/ now contains only the code that
    is relevant to the core C API libraries and associated programs.
  - I didn't want to bury the java/ and simd/ directories or add a level
    of depth to them, since both directories already contain source code
    that is 3-4 levels deep.
  - I would prefer not to separate the header files from the C source
    code, because:
    1. It would be disruptive.  libjpeg and libjpeg-turbo have
       historically placed C source code and headers in the same
       directory, and people who are familiar with both projects (self
       included) are used to looking for the headers in the same directory
       as the C source code.
    2. In terms of how the headers are used internally in libjpeg-turbo,
       the distinction between public and private headers is a bit fuzzy.
  - It didn't make sense to separate the test source code from the library
    source code, since there is not a clear distinction in some cases.
    (For instance, the IJG image I/O functions are used by cjpeg and djpeg
    as well as by the TurboJPEG API.)
  
  This solution is minimally disruptive, since it keeps all C source code
  and headers together and keeps java/ and simd/ as top-level directories.
  It is a bit awkward, because java/ and simd/ technically contain source
  code, even though they are not under src/.  However, other solutions
  would have been more awkward for different reasons.
  
  Closes #226
  

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• src/jdcol565.c

• /*
   * jdcol565.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * Modifications:
   * Copyright (C) 2013, Linaro Limited.
   * Copyright (C) 2014-2015, 2022, D. R. Commander.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains output colorspace conversion routines.
   */
  
  /* This file is included by jdcolor.c */
  
  
  INLINE
  LOCAL(void)
  ycc_rgb565_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                              JDIMENSION input_row, _JSAMPARRAY output_buf,
                              int num_rows)
  {
  #if BITS_IN_JSAMPLE != 16
    my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
    register int y, cb, cr;
    register _JSAMPROW outptr;
    register _JSAMPROW inptr0, inptr1, inptr2;
    register JDIMENSION col;
    JDIMENSION num_cols = cinfo->output_width;
    /* copy these pointers into registers if possible */
    register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit;
    register int *Crrtab = cconvert->Cr_r_tab;
    register int *Cbbtab = cconvert->Cb_b_tab;
    register JLONG *Crgtab = cconvert->Cr_g_tab;
    register JLONG *Cbgtab = cconvert->Cb_g_tab;
    SHIFT_TEMPS
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int r, g, b;
      inptr0 = input_buf[0][input_row];
      inptr1 = input_buf[1][input_row];
      inptr2 = input_buf[2][input_row];
      input_row++;
      outptr = *output_buf++;
  
      if (PACK_NEED_ALIGNMENT(outptr)) {
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[y + Crrtab[cr]];
        g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                              SCALEBITS))];
        b = range_limit[y + Cbbtab[cb]];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[y + Crrtab[cr]];
        g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                              SCALEBITS))];
        b = range_limit[y + Cbbtab[cb]];
        rgb = PACK_SHORT_565(r, g, b);
  
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[y + Crrtab[cr]];
        g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                              SCALEBITS))];
        b = range_limit[y + Cbbtab[cb]];
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
  
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        y  = *inptr0;
        cb = *inptr1;
        cr = *inptr2;
        r = range_limit[y + Crrtab[cr]];
        g = range_limit[y + ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                              SCALEBITS))];
        b = range_limit[y + Cbbtab[cb]];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  #else
    ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
  #endif
  }
  
  
  INLINE
  LOCAL(void)
  ycc_rgb565D_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                               JDIMENSION input_row, _JSAMPARRAY output_buf,
                               int num_rows)
  {
  #if BITS_IN_JSAMPLE != 16
    my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
    register int y, cb, cr;
    register _JSAMPROW outptr;
    register _JSAMPROW inptr0, inptr1, inptr2;
    register JDIMENSION col;
    JDIMENSION num_cols = cinfo->output_width;
    /* copy these pointers into registers if possible */
    register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit;
    register int *Crrtab = cconvert->Cr_r_tab;
    register int *Cbbtab = cconvert->Cb_b_tab;
    register JLONG *Crgtab = cconvert->Cr_g_tab;
    register JLONG *Cbgtab = cconvert->Cb_g_tab;
    JLONG d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
    SHIFT_TEMPS
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int r, g, b;
  
      inptr0 = input_buf[0][input_row];
      inptr1 = input_buf[1][input_row];
      inptr2 = input_buf[2][input_row];
      input_row++;
      outptr = *output_buf++;
      if (PACK_NEED_ALIGNMENT(outptr)) {
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
        g = range_limit[DITHER_565_G(y +
                                     ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                                       SCALEBITS)), d0)];
        b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
        g = range_limit[DITHER_565_G(y +
                                     ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                                       SCALEBITS)), d0)];
        b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
        d0 = DITHER_ROTATE(d0);
        rgb = PACK_SHORT_565(r, g, b);
  
        y  = *inptr0++;
        cb = *inptr1++;
        cr = *inptr2++;
        r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
        g = range_limit[DITHER_565_G(y +
                                     ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                                       SCALEBITS)), d0)];
        b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
        d0 = DITHER_ROTATE(d0);
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
  
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        y  = *inptr0;
        cb = *inptr1;
        cr = *inptr2;
        r = range_limit[DITHER_565_R(y + Crrtab[cr], d0)];
        g = range_limit[DITHER_565_G(y +
                                     ((int)RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
                                                       SCALEBITS)), d0)];
        b = range_limit[DITHER_565_B(y + Cbbtab[cb], d0)];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  #else
    ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
  #endif
  }
  
  
  INLINE
  LOCAL(void)
  rgb_rgb565_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                              JDIMENSION input_row, _JSAMPARRAY output_buf,
                              int num_rows)
  {
    register _JSAMPROW outptr;
    register _JSAMPROW inptr0, inptr1, inptr2;
    register JDIMENSION col;
    JDIMENSION num_cols = cinfo->output_width;
    SHIFT_TEMPS
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int r, g, b;
  
      inptr0 = input_buf[0][input_row];
      inptr1 = input_buf[1][input_row];
      inptr2 = input_buf[2][input_row];
      input_row++;
      outptr = *output_buf++;
      if (PACK_NEED_ALIGNMENT(outptr)) {
        r = *inptr0++;
        g = *inptr1++;
        b = *inptr2++;
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        r = *inptr0++;
        g = *inptr1++;
        b = *inptr2++;
        rgb = PACK_SHORT_565(r, g, b);
  
        r = *inptr0++;
        g = *inptr1++;
        b = *inptr2++;
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
  
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        r = *inptr0;
        g = *inptr1;
        b = *inptr2;
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  }
  
  
  INLINE
  LOCAL(void)
  rgb_rgb565D_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                               JDIMENSION input_row, _JSAMPARRAY output_buf,
                               int num_rows)
  {
    register _JSAMPROW outptr;
    register _JSAMPROW inptr0, inptr1, inptr2;
    register JDIMENSION col;
    register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit;
    JDIMENSION num_cols = cinfo->output_width;
    JLONG d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
    SHIFT_TEMPS
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int r, g, b;
  
      inptr0 = input_buf[0][input_row];
      inptr1 = input_buf[1][input_row];
      inptr2 = input_buf[2][input_row];
      input_row++;
      outptr = *output_buf++;
      if (PACK_NEED_ALIGNMENT(outptr)) {
        r = range_limit[DITHER_565_R(*inptr0++, d0)];
        g = range_limit[DITHER_565_G(*inptr1++, d0)];
        b = range_limit[DITHER_565_B(*inptr2++, d0)];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        r = range_limit[DITHER_565_R(*inptr0++, d0)];
        g = range_limit[DITHER_565_G(*inptr1++, d0)];
        b = range_limit[DITHER_565_B(*inptr2++, d0)];
        d0 = DITHER_ROTATE(d0);
        rgb = PACK_SHORT_565(r, g, b);
  
        r = range_limit[DITHER_565_R(*inptr0++, d0)];
        g = range_limit[DITHER_565_G(*inptr1++, d0)];
        b = range_limit[DITHER_565_B(*inptr2++, d0)];
        d0 = DITHER_ROTATE(d0);
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(r, g, b));
  
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        r = range_limit[DITHER_565_R(*inptr0, d0)];
        g = range_limit[DITHER_565_G(*inptr1, d0)];
        b = range_limit[DITHER_565_B(*inptr2, d0)];
        rgb = PACK_SHORT_565(r, g, b);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  }
  
  
  INLINE
  LOCAL(void)
  gray_rgb565_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                               JDIMENSION input_row, _JSAMPARRAY output_buf,
                               int num_rows)
  {
    register _JSAMPROW inptr, outptr;
    register JDIMENSION col;
    JDIMENSION num_cols = cinfo->output_width;
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int g;
  
      inptr = input_buf[0][input_row++];
      outptr = *output_buf++;
      if (PACK_NEED_ALIGNMENT(outptr)) {
        g = *inptr++;
        rgb = PACK_SHORT_565(g, g, g);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        g = *inptr++;
        rgb = PACK_SHORT_565(g, g, g);
        g = *inptr++;
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g));
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        g = *inptr;
        rgb = PACK_SHORT_565(g, g, g);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  }
  
  
  INLINE
  LOCAL(void)
  gray_rgb565D_convert_internal(j_decompress_ptr cinfo, _JSAMPIMAGE input_buf,
                                JDIMENSION input_row, _JSAMPARRAY output_buf,
                                int num_rows)
  {
    register _JSAMPROW inptr, outptr;
    register JDIMENSION col;
    register _JSAMPLE *range_limit = (_JSAMPLE *)cinfo->sample_range_limit;
    JDIMENSION num_cols = cinfo->output_width;
    JLONG d0 = dither_matrix[cinfo->output_scanline & DITHER_MASK];
  
    while (--num_rows >= 0) {
      JLONG rgb;
      unsigned int g;
  
      inptr = input_buf[0][input_row++];
      outptr = *output_buf++;
      if (PACK_NEED_ALIGNMENT(outptr)) {
        g = *inptr++;
        g = range_limit[DITHER_565_R(g, d0)];
        rgb = PACK_SHORT_565(g, g, g);
        *(INT16 *)outptr = (INT16)rgb;
        outptr += 2;
        num_cols--;
      }
      for (col = 0; col < (num_cols >> 1); col++) {
        g = *inptr++;
        g = range_limit[DITHER_565_R(g, d0)];
        rgb = PACK_SHORT_565(g, g, g);
        d0 = DITHER_ROTATE(d0);
  
        g = *inptr++;
        g = range_limit[DITHER_565_R(g, d0)];
        rgb = PACK_TWO_PIXELS(rgb, PACK_SHORT_565(g, g, g));
        d0 = DITHER_ROTATE(d0);
  
        WRITE_TWO_ALIGNED_PIXELS(outptr, rgb);
        outptr += 4;
      }
      if (num_cols & 1) {
        g = *inptr;
        g = range_limit[DITHER_565_R(g, d0)];
        rgb = PACK_SHORT_565(g, g, g);
        *(INT16 *)outptr = (INT16)rgb;
      }
    }
  }
  

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