/*
 * jsimd_x86_64.c
 *
 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
 * Copyright 2009 D. R. Commander
 * 
 * Based on the x86 SIMD extension for IJG JPEG library,
 * Copyright (C) 1999-2006, MIYASAKA Masaru.
 *
 * This file contains the interface between the "normal" portions
 * of the library and the SIMD implementations when running on a
 * x86_64 architecture.
 */

#define JPEG_INTERNALS
#include "../jinclude.h"
#include "../jpeglib.h"
#include "../jsimd.h"
#include "../jdct.h"
#include "../jsimddct.h"
#include "simd/jsimd.h"

/*
 * In the PIC cases, we have no guarantee that constants will keep
 * their alignment. This macro allows us to verify it at runtime.
 */
#define IS_ALIGNED(ptr, order) (((unsigned long)ptr & ((1 << order) - 1)) == 0)

#define IS_ALIGNED_SSE(ptr) (IS_ALIGNED(ptr, 4)) /* 16 byte alignment */

GLOBAL(int)
jsimd_can_rgb_ycc (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_rgb_ycc_convert_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_ycc_rgb (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_ycc_rgb_convert_sse2))
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_rgb_ycc_convert (j_compress_ptr cinfo,
                       JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
                       JDIMENSION output_row, int num_rows)
{
  void (*sse2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);

  switch(cinfo->in_color_space)
  {
    case JCS_EXT_RGB:
      sse2fct=jsimd_extrgb_ycc_convert_sse2;
      break;
    case JCS_EXT_RGBX:
      sse2fct=jsimd_extrgbx_ycc_convert_sse2;
      break;
    case JCS_EXT_BGR:
      sse2fct=jsimd_extbgr_ycc_convert_sse2;
      break;
    case JCS_EXT_BGRX:
      sse2fct=jsimd_extbgrx_ycc_convert_sse2;
      break;
    case JCS_EXT_XBGR:
      sse2fct=jsimd_extxbgr_ycc_convert_sse2;
      break;
    case JCS_EXT_XRGB:
      sse2fct=jsimd_extxrgb_ycc_convert_sse2;
      break;
    default:
      sse2fct=jsimd_rgb_ycc_convert_sse2;
      break;
  }

  sse2fct(cinfo->image_width, input_buf, output_buf, output_row, 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 (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);

  switch(cinfo->out_color_space)
  {
    case JCS_EXT_RGB:
      sse2fct=jsimd_ycc_extrgb_convert_sse2;
      break;
    case JCS_EXT_RGBX:
      sse2fct=jsimd_ycc_extrgbx_convert_sse2;
      break;
    case JCS_EXT_BGR:
      sse2fct=jsimd_ycc_extbgr_convert_sse2;
      break;
    case JCS_EXT_BGRX:
      sse2fct=jsimd_ycc_extbgrx_convert_sse2;
      break;
    case JCS_EXT_XBGR:
      sse2fct=jsimd_ycc_extxbgr_convert_sse2;
      break;
    case JCS_EXT_XRGB:
      sse2fct=jsimd_ycc_extxrgb_convert_sse2;
      break;
    default:
      sse2fct=jsimd_ycc_rgb_convert_sse2;
      break;
  }

  sse2fct(cinfo->output_width, input_buf, input_row, output_buf, num_rows);
}

GLOBAL(int)
jsimd_can_h2v2_downsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_h2v1_downsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
                       JSAMPARRAY input_data, JSAMPARRAY output_data)
{
  jsimd_h2v2_downsample_sse2(cinfo->image_width,
                             cinfo->max_v_samp_factor,
                             compptr->v_samp_factor,
                             compptr->width_in_blocks,
                             input_data, output_data);
}

GLOBAL(void)
jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
                       JSAMPARRAY input_data, JSAMPARRAY output_data)
{
  jsimd_h2v1_downsample_sse2(cinfo->image_width,
                             cinfo->max_v_samp_factor,
                             compptr->v_samp_factor,
                             compptr->width_in_blocks,
                             input_data, output_data);
}

GLOBAL(int)
jsimd_can_h2v2_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_h2v1_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_h2v2_upsample (j_decompress_ptr cinfo,
                     jpeg_component_info * compptr, 
                     JSAMPARRAY input_data,
                     JSAMPARRAY * output_data_ptr)
{
  jsimd_h2v2_upsample_sse2(cinfo->max_v_samp_factor,
                           cinfo->output_width,
                           input_data, output_data_ptr);
}

GLOBAL(void)
jsimd_h2v1_upsample (j_decompress_ptr cinfo,
                     jpeg_component_info * compptr, 
                     JSAMPARRAY input_data,
                     JSAMPARRAY * output_data_ptr)
{
  jsimd_h2v1_upsample_sse2(cinfo->max_v_samp_factor,
                           cinfo->output_width,
                           input_data, output_data_ptr);
}

GLOBAL(int)
jsimd_can_h2v2_fancy_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_h2v1_fancy_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_h2v2_fancy_upsample (j_decompress_ptr cinfo,
                           jpeg_component_info * compptr, 
                           JSAMPARRAY input_data,
                           JSAMPARRAY * output_data_ptr)
{
  jsimd_h2v1_fancy_upsample_sse2(cinfo->max_v_samp_factor,
                                 compptr->downsampled_width,
                                 input_data, 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_sse2(cinfo->max_v_samp_factor,
                                 compptr->downsampled_width,
                                 input_data, output_data_ptr);
}

GLOBAL(int)
jsimd_can_h2v2_merged_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_h2v1_merged_upsample (void)
{
  /* The code is optimised for these values only */
  if (BITS_IN_JSAMPLE != 8)
    return 0;
  if (sizeof(JDIMENSION) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_h2v2_merged_upsample (j_decompress_ptr cinfo,
                            JSAMPIMAGE input_buf,
                            JDIMENSION in_row_group_ctr,
                            JSAMPARRAY output_buf)
{
  void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);

  switch(cinfo->out_color_space)
  {
    case JCS_EXT_RGB:
      sse2fct=jsimd_h2v2_extrgb_merged_upsample_sse2;
      break;
    case JCS_EXT_RGBX:
      sse2fct=jsimd_h2v2_extrgbx_merged_upsample_sse2;
      break;
    case JCS_EXT_BGR:
      sse2fct=jsimd_h2v2_extbgr_merged_upsample_sse2;
      break;
    case JCS_EXT_BGRX:
      sse2fct=jsimd_h2v2_extbgrx_merged_upsample_sse2;
      break;
    case JCS_EXT_XBGR:
      sse2fct=jsimd_h2v2_extxbgr_merged_upsample_sse2;
      break;
    case JCS_EXT_XRGB:
      sse2fct=jsimd_h2v2_extxrgb_merged_upsample_sse2;
      break;
    default:
      sse2fct=jsimd_h2v2_merged_upsample_sse2;
      break;
  }

  sse2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf);
}

GLOBAL(void)
jsimd_h2v1_merged_upsample (j_decompress_ptr cinfo,
                            JSAMPIMAGE input_buf,
                            JDIMENSION in_row_group_ctr,
                            JSAMPARRAY output_buf)
{
  void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);

  switch(cinfo->out_color_space)
  {
    case JCS_EXT_RGB:
      sse2fct=jsimd_h2v1_extrgb_merged_upsample_sse2;
      break;
    case JCS_EXT_RGBX:
      sse2fct=jsimd_h2v1_extrgbx_merged_upsample_sse2;
      break;
    case JCS_EXT_BGR:
      sse2fct=jsimd_h2v1_extbgr_merged_upsample_sse2;
      break;
    case JCS_EXT_BGRX:
      sse2fct=jsimd_h2v1_extbgrx_merged_upsample_sse2;
      break;
    case JCS_EXT_XBGR:
      sse2fct=jsimd_h2v1_extxbgr_merged_upsample_sse2;
      break;
    case JCS_EXT_XRGB:
      sse2fct=jsimd_h2v1_extxrgb_merged_upsample_sse2;
      break;
    default:
      sse2fct=jsimd_h2v1_merged_upsample_sse2;
      break;
  }

  sse2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf);
}

GLOBAL(int)
jsimd_can_convsamp (void)
{
  /* 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;

  return 1;
}

GLOBAL(int)
jsimd_can_convsamp_float (void)
{
  /* 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(FAST_FLOAT) != 4)
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_convsamp (JSAMPARRAY sample_data, JDIMENSION start_col,
                DCTELEM * workspace)
{
  jsimd_convsamp_sse2(sample_data, start_col, workspace);
}

GLOBAL(void)
jsimd_convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col,
                      FAST_FLOAT * workspace)
{
  jsimd_convsamp_float_sse2(sample_data, start_col, workspace);
}

GLOBAL(int)
jsimd_can_fdct_islow (void)
{
  /* The code is optimised for these values only */
  if (DCTSIZE != 8)
    return 0;
  if (sizeof(DCTELEM) != 2)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_fdct_islow_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_fdct_ifast (void)
{
  /* The code is optimised for these values only */
  if (DCTSIZE != 8)
    return 0;
  if (sizeof(DCTELEM) != 2)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_fdct_ifast_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_fdct_float (void)
{
  /* The code is optimised for these values only */
  if (DCTSIZE != 8)
    return 0;
  if (sizeof(FAST_FLOAT) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_fdct_float_sse))
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_fdct_islow (DCTELEM * data)
{
  jsimd_fdct_islow_sse2(data);
}

GLOBAL(void)
jsimd_fdct_ifast (DCTELEM * data)
{
  jsimd_fdct_ifast_sse2(data);
}

GLOBAL(void)
jsimd_fdct_float (FAST_FLOAT * data)
{
  jsimd_fdct_float_sse(data);
}

GLOBAL(int)
jsimd_can_quantize (void)
{
  /* 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;

  return 1;
}

GLOBAL(int)
jsimd_can_quantize_float (void)
{
  /* The code is optimised for these values only */
  if (DCTSIZE != 8)
    return 0;
  if (sizeof(JCOEF) != 2)
    return 0;
  if (sizeof(FAST_FLOAT) != 4)
    return 0;

  return 1;
}

GLOBAL(void)
jsimd_quantize (JCOEFPTR coef_block, DCTELEM * divisors,
                DCTELEM * workspace)
{
  jsimd_quantize_sse2(coef_block, divisors, workspace);
}

GLOBAL(void)
jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors,
                      FAST_FLOAT * workspace)
{
  jsimd_quantize_float_sse2(coef_block, divisors, workspace);
}

GLOBAL(int)
jsimd_can_idct_2x2 (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_idct_red_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_idct_4x4 (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_idct_red_sse2))
    return 0;

  return 1;
}

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_sse2(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_sse2(compptr->dct_table, coef_block, output_buf, output_col);
}

GLOBAL(int)
jsimd_can_idct_islow (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_idct_islow_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_idct_ifast (void)
{
  /* 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 (!IS_ALIGNED_SSE(jconst_idct_ifast_sse2))
    return 0;

  return 1;
}

GLOBAL(int)
jsimd_can_idct_float (void)
{
  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(FAST_FLOAT) != 4)
    return 0;
  if (sizeof(FLOAT_MULT_TYPE) != 4)
    return 0;

  if (!IS_ALIGNED_SSE(jconst_idct_float_sse2))
    return 0;

  return 1;
}

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_sse2(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_sse2(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)
{
  jsimd_idct_float_sse2(compptr->dct_table, coef_block,
                        output_buf, output_col);
}