/*

 * jsimd_arm.c

 *

 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB</ossman@cendio.se>

 * Copyright (C) 2011, Nokia Corporation and/or its subsidiary(-ies).

 * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, D. R. Commander.

 * Copyright (C) 2015-2016, 2018, Matthieu Darbois.

 * Copyright (C) 2019, Google LLC.

 *

 * Based on the x86 SIMD extension for IJG JPEG library,

 * Copyright (C) 1999-2006, MIYASAKA Masaru.

 * For conditions of distribution and use, see copyright notice in jsimdext.inc

 *

 * This file contains the interface between the "normal" portions

 * of the library and the SIMD implementations when running on a

 * 32-bit Arm architecture.

 */

#define JPEG_INTERNALS

#include "../../jinclude.h"

#include "../../jpeglib.h"

#include "../../jsimd.h"

#include "../../jdct.h"

#include "../../jsimddct.h"

#include "../jsimd.h"

#include <stdio.h></stdio.h>

#include <string.h></string.h>

#include <ctype.h></ctype.h>

static unsigned int simd_support = ~0;

static unsigned int simd_huffman = 1;

#if !defined(__ARM_NEON__) && (defined(__linux__) || defined(ANDROID) || defined(__ANDROID__))

#define SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT  (1024 * 1024)

LOCAL(int)

check_feature(char *buffer, char *feature)

{

  char *p;

  if (*feature == 0)

    return 0;

  if (strncmp(buffer, "Features", 8) != 0)

    return 0;

  buffer += 8;

  while (isspace(*buffer))

    buffer++;

  /* Check if 'feature' is present in the buffer as a separate word */

  while ((p = strstr(buffer, feature))) {

    if (p > buffer && !isspace(*(p - 1))) {

      buffer++;

      continue;

    }

    p += strlen(feature);

    if (*p != 0 && !isspace(*p)) {

      buffer++;

      continue;

    }

    return 1;

  }

  return 0;

}

LOCAL(int)

parse_proc_cpuinfo(int bufsize)

{

  char *buffer = (char *)malloc(bufsize);

  FILE *fd;

  simd_support = 0;

  if (!buffer)

    return 0;

  fd = fopen("/proc/cpuinfo", "r");

  if (fd) {

    while (fgets(buffer, bufsize, fd)) {

      if (!strchr(buffer, '\n') && !feof(fd)) {

        /* "impossible" happened - insufficient size of the buffer! */

        fclose(fd);

        free(buffer);

        return 0;

      }

      if (check_feature(buffer, "neon"))

        simd_support |= JSIMD_NEON;

    }

    fclose(fd);

  }

  free(buffer);

  return 1;

}

#endif

/*

 * Check what SIMD accelerations are supported.

 *

 * FIXME: This code is racy under a multi-threaded environment.

 */

LOCAL(void)

init_simd(void)

{

#ifndef NO_GETENV

  char *env = NULL;

#endif

#if !defined(__ARM_NEON__) && (defined(__linux__) || defined(ANDROID) || defined(__ANDROID__))

  int bufsize = 1024; /* an initial guess for the line buffer size limit */

#endif

  if (simd_support != ~0U)

    return;

  simd_support = 0;

#if defined(__ARM_NEON__)

  simd_support |= JSIMD_NEON;

#elif defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)

  /* We still have a chance to use Neon regardless of globally used

   * -mcpu/-mfpu options passed to gcc by performing runtime detection via

   * /proc/cpuinfo parsing on linux/android */

  while (!parse_proc_cpuinfo(bufsize)) {

    bufsize *= 2;

    if (bufsize > SOMEWHAT_SANE_PROC_CPUINFO_SIZE_LIMIT)

      break;

  }

#endif

#ifndef NO_GETENV

  /* Force different settings through environment variables */

  env = getenv("JSIMD_FORCENEON");

  if ((env != NULL) && (strcmp(env, "1") == 0))

    simd_support = JSIMD_NEON;

  env = getenv("JSIMD_FORCENONE");

  if ((env != NULL) && (strcmp(env, "1") == 0))

    simd_support = 0;

  env = getenv("JSIMD_NOHUFFENC");

  if ((env != NULL) && (strcmp(env, "1") == 0))

    simd_huffman = 0;

#endif

}

GLOBAL(int)

jsimd_can_rgb_ycc(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_rgb_gray(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_ycc_rgb(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_ycc_rgb565(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(void)

jsimd_rgb_ycc_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,

                      JSAMPIMAGE output_buf, JDIMENSION output_row,

                      int num_rows)

{

  void (*neonfct) (JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);

  switch (cinfo->in_color_space) {

  case JCS_EXT_RGB:

    neonfct = jsimd_extrgb_ycc_convert_neon;

    break;

  case JCS_EXT_RGBX:

  case JCS_EXT_RGBA:

    neonfct = jsimd_extrgbx_ycc_convert_neon;

    break;

  case JCS_EXT_BGR:

    neonfct = jsimd_extbgr_ycc_convert_neon;

    break;

  case JCS_EXT_BGRX:

  case JCS_EXT_BGRA:

    neonfct = jsimd_extbgrx_ycc_convert_neon;

    break;

  case JCS_EXT_XBGR:

  case JCS_EXT_ABGR:

    neonfct = jsimd_extxbgr_ycc_convert_neon;

    break;

  case JCS_EXT_XRGB:

  case JCS_EXT_ARGB:

    neonfct = jsimd_extxrgb_ycc_convert_neon;

    break;

  default:

    neonfct = jsimd_extrgb_ycc_convert_neon;

    break;

  }

  neonfct(cinfo->image_width, input_buf, output_buf, output_row, num_rows);

}

GLOBAL(void)

jsimd_rgb_gray_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,

                       JSAMPIMAGE output_buf, JDIMENSION output_row,

                       int num_rows)

{

}

GLOBAL(void)

jsimd_ycc_rgb_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

                      JDIMENSION input_row, JSAMPARRAY output_buf,

                      int num_rows)

{

  void (*neonfct) (JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);

  switch (cinfo->out_color_space) {

  case JCS_EXT_RGB:

    neonfct = jsimd_ycc_extrgb_convert_neon;

    break;

  case JCS_EXT_RGBX:

  case JCS_EXT_RGBA:

    neonfct = jsimd_ycc_extrgbx_convert_neon;

    break;

  case JCS_EXT_BGR:

    neonfct = jsimd_ycc_extbgr_convert_neon;

    break;

  case JCS_EXT_BGRX:

  case JCS_EXT_BGRA:

    neonfct = jsimd_ycc_extbgrx_convert_neon;

    break;

  case JCS_EXT_XBGR:

  case JCS_EXT_ABGR:

    neonfct = jsimd_ycc_extxbgr_convert_neon;

    break;

  case JCS_EXT_XRGB:

  case JCS_EXT_ARGB:

    neonfct = jsimd_ycc_extxrgb_convert_neon;

    break;

  default:

    neonfct = jsimd_ycc_extrgb_convert_neon;

    break;

  }

  neonfct(cinfo->output_width, input_buf, input_row, output_buf, num_rows);

}

GLOBAL(void)

jsimd_ycc_rgb565_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

                         JDIMENSION input_row, JSAMPARRAY output_buf,

                         int num_rows)

{

  jsimd_ycc_rgb565_convert_neon(cinfo->output_width, input_buf, input_row,

                                output_buf, num_rows);

}

GLOBAL(int)

jsimd_can_h2v2_downsample(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_h2v1_downsample(void)

{

  return 0;

}

GLOBAL(void)

jsimd_h2v2_downsample(j_compress_ptr cinfo, jpeg_component_info *compptr,

                      JSAMPARRAY input_data, JSAMPARRAY output_data)

{

}

GLOBAL(void)

jsimd_h2v1_downsample(j_compress_ptr cinfo, jpeg_component_info *compptr,

                      JSAMPARRAY input_data, JSAMPARRAY output_data)

{

}

GLOBAL(int)

jsimd_can_h2v2_upsample(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_h2v1_upsample(void)

{

  return 0;

}

GLOBAL(void)

jsimd_h2v2_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                    JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr)

{

}

GLOBAL(void)

jsimd_h2v1_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                    JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr)

{

}

GLOBAL(int)

jsimd_can_h2v2_fancy_upsample(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_h2v1_fancy_upsample(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(void)

jsimd_h2v2_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                          JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr)

{

}

GLOBAL(void)

jsimd_h2v1_fancy_upsample(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                          JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr)

{

  jsimd_h2v1_fancy_upsample_neon(cinfo->max_v_samp_factor,

                                 compptr->downsampled_width, input_data,

                                 output_data_ptr);

}

GLOBAL(int)

jsimd_can_h2v2_merged_upsample(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_h2v1_merged_upsample(void)

{

  return 0;

}

GLOBAL(void)

jsimd_h2v2_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

                           JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)

{

}

GLOBAL(void)

jsimd_h2v1_merged_upsample(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,

                           JDIMENSION in_row_group_ctr, JSAMPARRAY output_buf)

{

}

GLOBAL(int)

jsimd_can_convsamp(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (sizeof(DCTELEM) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_convsamp_float(void)

{

  return 0;

}

GLOBAL(void)

jsimd_convsamp(JSAMPARRAY sample_data, JDIMENSION start_col,

               DCTELEM *workspace)

{

  jsimd_convsamp_neon(sample_data, start_col, workspace);

}

GLOBAL(void)

jsimd_convsamp_float(JSAMPARRAY sample_data, JDIMENSION start_col,

                     FAST_FLOAT *workspace)

{

}

GLOBAL(int)

jsimd_can_fdct_islow(void)

{

  return 0;

}

GLOBAL(int)

jsimd_can_fdct_ifast(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(DCTELEM) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_fdct_float(void)

{

  return 0;

}

GLOBAL(void)

jsimd_fdct_islow(DCTELEM *data)

{

}

GLOBAL(void)

jsimd_fdct_ifast(DCTELEM *data)

{

  jsimd_fdct_ifast_neon(data);

}

GLOBAL(void)

jsimd_fdct_float(FAST_FLOAT *data)

{

}

GLOBAL(int)

jsimd_can_quantize(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (sizeof(DCTELEM) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_quantize_float(void)

{

  return 0;

}

GLOBAL(void)

jsimd_quantize(JCOEFPTR coef_block, DCTELEM *divisors, DCTELEM *workspace)

{

  jsimd_quantize_neon(coef_block, divisors, workspace);

}

GLOBAL(void)

jsimd_quantize_float(JCOEFPTR coef_block, FAST_FLOAT *divisors,

                     FAST_FLOAT *workspace)

{

}

GLOBAL(int)

jsimd_can_idct_2x2(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (sizeof(ISLOW_MULT_TYPE) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_idct_4x4(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (sizeof(ISLOW_MULT_TYPE) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(void)

jsimd_idct_2x2(j_decompress_ptr cinfo, jpeg_component_info *compptr,

               JCOEFPTR coef_block, JSAMPARRAY output_buf,

               JDIMENSION output_col)

{

  jsimd_idct_2x2_neon(compptr->dct_table, coef_block, output_buf, output_col);

}

GLOBAL(void)

jsimd_idct_4x4(j_decompress_ptr cinfo, jpeg_component_info *compptr,

               JCOEFPTR coef_block, JSAMPARRAY output_buf,

               JDIMENSION output_col)

{

  jsimd_idct_4x4_neon(compptr->dct_table, coef_block, output_buf, output_col);

}

GLOBAL(int)

jsimd_can_idct_islow(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (sizeof(ISLOW_MULT_TYPE) != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_idct_ifast(void)

{

  init_simd();

  /* The code is optimised for these values only */

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (BITS_IN_JSAMPLE != 8)

    return 0;

  if (sizeof(JDIMENSION) != 4)

    return 0;

  if (sizeof(IFAST_MULT_TYPE) != 2)

    return 0;

  if (IFAST_SCALE_BITS != 2)

    return 0;

  if (simd_support & JSIMD_NEON)

    return 1;

  return 0;

}

GLOBAL(int)

jsimd_can_idct_float(void)

{

  return 0;

}

GLOBAL(void)

jsimd_idct_islow(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                 JCOEFPTR coef_block, JSAMPARRAY output_buf,

                 JDIMENSION output_col)

{

  jsimd_idct_islow_neon(compptr->dct_table, coef_block, output_buf,

                        output_col);

}

GLOBAL(void)

jsimd_idct_ifast(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                 JCOEFPTR coef_block, JSAMPARRAY output_buf,

                 JDIMENSION output_col)

{

  jsimd_idct_ifast_neon(compptr->dct_table, coef_block, output_buf,

                        output_col);

}

GLOBAL(void)

jsimd_idct_float(j_decompress_ptr cinfo, jpeg_component_info *compptr,

                 JCOEFPTR coef_block, JSAMPARRAY output_buf,

                 JDIMENSION output_col)

{

}

GLOBAL(int)

jsimd_can_huff_encode_one_block(void)

{

  init_simd();

  if (DCTSIZE != 8)

    return 0;

  if (sizeof(JCOEF) != 2)

    return 0;

  if (simd_support & JSIMD_NEON && simd_huffman)

    return 1;

  return 0;

}

GLOBAL(JOCTET *)

jsimd_huff_encode_one_block(void *state, JOCTET *buffer, JCOEFPTR block,

                            int last_dc_val, c_derived_tbl *dctbl,

                            c_derived_tbl *actbl)

{

  return jsimd_huff_encode_one_block_neon(state, buffer, block, last_dc_val,

                                          dctbl, actbl);

}

GLOBAL(int)

jsimd_can_encode_mcu_AC_first_prepare(void)

{

  return 0;

}

GLOBAL(void)

jsimd_encode_mcu_AC_first_prepare(const JCOEF *block,

                                  const int *jpeg_natural_order_start, int Sl,

                                  int Al, JCOEF *values, size_t *zerobits)

{

}

GLOBAL(int)

jsimd_can_encode_mcu_AC_refine_prepare(void)

{

  return 0;

}

GLOBAL(int)

jsimd_encode_mcu_AC_refine_prepare(const JCOEF *block,

                                   const int *jpeg_natural_order_start, int Sl,

                                   int Al, JCOEF *absvalues, size_t *bits)

{

  return 0;

}