/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * Copyright (c) 2001-2003 Michael David Adams
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person (the
 * "User") obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 * 
 * 1.  The above copyright notices and this permission notice (which
 * includes the disclaimer below) shall be included in all copies or
 * substantial portions of the Software.
 * 
 * 2.  The name of a copyright holder shall not be used to endorse or
 * promote products derived from the Software without specific prior
 * written permission.
 * 
 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
 * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
 * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
 * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
 * 
 * __END_OF_JASPER_LICENSE__
 */

/*
 * Windows Bitmap File Library
 *
 * $Id: bmp_enc.c,v 1.1 2005/05/22 18:33:00 malaterre Exp $
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>

#include "jasper/jas_types.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_image.h"
#include "jasper/jas_debug.h"

#include "bmp_enc.h"
#include "bmp_cod.h"

/******************************************************************************\
* Local prototypes.
\******************************************************************************/

static int bmp_puthdr(jas_stream_t *out, bmp_hdr_t *hdr);
static int bmp_putinfo(jas_stream_t *out, bmp_info_t *info);
static int bmp_putdata(jas_stream_t *out, bmp_info_t *info, jas_image_t *image, int *cmpts);
static int bmp_putint16(jas_stream_t *in, int_fast16_t val);
static int bmp_putint32(jas_stream_t *out, int_fast32_t val);

/******************************************************************************\
* Interface functions.
\******************************************************************************/

int bmp_encode(jas_image_t *image, jas_stream_t *out, char *optstr)
{
  jas_image_coord_t width;
  jas_image_coord_t height;
  int depth;
  int cmptno;
  bmp_hdr_t hdr;
  bmp_info_t *info;
  int_fast32_t datalen;
  int numpad;
  bmp_enc_t encbuf;
  bmp_enc_t *enc = &encbuf;
  jas_clrspc_t clrspc;

  if (optstr) {
    fprintf(stderr, "warning: ignoring BMP encoder options\n");
  }

  clrspc = jas_image_clrspc(image);
  switch (jas_clrspc_fam(clrspc)) {
  case JAS_CLRSPC_FAM_RGB:
    if (clrspc != JAS_CLRSPC_SRGB)
      jas_eprintf("warning: inaccurate color\n");
    break;
  case JAS_CLRSPC_FAM_GRAY:
    if (clrspc != JAS_CLRSPC_SGRAY)
      jas_eprintf("warning: inaccurate color\n");
    break;
  default:
    jas_eprintf("error: BMP format does not support color space\n");
    return -1;
    break;
  }

  switch (jas_clrspc_fam(clrspc)) {
  case JAS_CLRSPC_FAM_RGB:
    enc->numcmpts = 3;
    if ((enc->cmpts[0] = jas_image_getcmptbytype(image,
      JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_R))) < 0 ||
      (enc->cmpts[1] = jas_image_getcmptbytype(image,
      JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_G))) < 0 ||
      (enc->cmpts[2] = jas_image_getcmptbytype(image,
      JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_RGB_B))) < 0) {
      jas_eprintf("error: missing color component\n");
      return -1;
    }
    break;
  case JAS_CLRSPC_FAM_GRAY:
    enc->numcmpts = 1;
    if ((enc->cmpts[0] = jas_image_getcmptbytype(image,
      JAS_IMAGE_CT_COLOR(JAS_CLRSPC_CHANIND_GRAY_Y))) < 0) {
      jas_eprintf("error: missing color component\n");
      return -1;
    }
    break;
  default:
    abort();
    break;
  }

  width = jas_image_cmptwidth(image, enc->cmpts[0]);
  height = jas_image_cmptheight(image, enc->cmpts[0]);
  depth = jas_image_cmptprec(image, enc->cmpts[0]);

  /* Check to ensure that the image to be saved can actually be represented
    using the BMP format. */
  for (cmptno = 0; cmptno < enc->numcmpts; ++cmptno) {
    if (jas_image_cmptwidth(image, enc->cmpts[cmptno]) != width ||
      jas_image_cmptheight(image, enc->cmpts[cmptno]) != height ||
      jas_image_cmptprec(image, enc->cmpts[cmptno]) != depth ||
      jas_image_cmptsgnd(image, enc->cmpts[cmptno]) != false ||
      jas_image_cmpttlx(image, enc->cmpts[cmptno]) != 0 ||
      jas_image_cmpttly(image, enc->cmpts[cmptno]) != 0) {
      fprintf(stderr, "The BMP format cannot be used to represent an image with this geometry.\n");
      return -1;
    }
  }

  /* The component depths must be 1, 4, or 8. */
  if (depth != 1 && depth != 4 && depth != 8) {
    return -1;
  }

  numpad = (width * enc->numcmpts) % 4;
  if (numpad) {
    numpad = 4 - numpad;
  }
  datalen = (enc->numcmpts * width + numpad) * height;

  if (!(info = bmp_info_create())) {
    return -1;
  }
  info->len = BMP_INFOLEN;
  info->width = width;
  info->height = height;
  info->numplanes = 1;
  info->depth = enc->numcmpts * depth;
  info->enctype = BMP_ENC_RGB;
  info->siz = datalen;
  info->hres = 0;
  info->vres = 0;
  info->numcolors = (enc->numcmpts == 1) ? 256 : 0;
  info->mincolors = 0;

  hdr.magic = BMP_MAGIC;
  hdr.siz = BMP_HDRLEN + BMP_INFOLEN + 0 + datalen;
  hdr.off = BMP_HDRLEN + BMP_INFOLEN + BMP_PALLEN(info);

  /* Write the bitmap header. */
  if (bmp_puthdr(out, &hdr)) {
    return -1;
  }

  /* Write the bitmap information. */
  if (bmp_putinfo(out, info)) {
    return -1;
  }

  /* Write the bitmap data. */
  if (bmp_putdata(out, info, image, enc->cmpts)) {
    return -1;
  }

  bmp_info_destroy(info);

  return 0;
}

/******************************************************************************\
* Code for aggregate types.
\******************************************************************************/

static int bmp_puthdr(jas_stream_t *out, bmp_hdr_t *hdr)
{
  assert(hdr->magic == BMP_MAGIC);
  if (bmp_putint16(out, hdr->magic) || bmp_putint32(out, hdr->siz) ||
    bmp_putint32(out, 0) || bmp_putint32(out, hdr->off)) {
    return -1;
  }
  return 0;
}

static int bmp_putinfo(jas_stream_t *out, bmp_info_t *info)
{
  int i;

  info->len = 40;
  if (bmp_putint32(out, info->len) ||
    bmp_putint32(out, info->width) ||
    bmp_putint32(out, info->height) ||
    bmp_putint16(out, info->numplanes) ||
    bmp_putint16(out, info->depth) ||
    bmp_putint32(out, info->enctype) ||
    bmp_putint32(out, info->siz) ||
    bmp_putint32(out, info->hres) ||
    bmp_putint32(out, info->vres) ||
    bmp_putint32(out, info->numcolors) ||
    bmp_putint32(out, info->mincolors)) {
    return -1;
  }

  for (i = 0; i < info->numcolors; ++i)
  {
    if (jas_stream_putc(out, i) == EOF ||
      jas_stream_putc(out, i) == EOF ||
      jas_stream_putc(out, i) == EOF ||
      jas_stream_putc(out, 0) == EOF)
    {
      return -1;
    }
  }

  return 0;
}

static int bmp_putdata(jas_stream_t *out, bmp_info_t *info, jas_image_t *image,
  int *cmpts)
{
  int i;
  int j;
  jas_matrix_t *bufs[3];
  int numpad;
  unsigned char red;
  unsigned char grn;
  unsigned char blu;
  int ret;
  int numcmpts;
  int v;
  int cmptno;

  numcmpts = (info->depth == 24) ? 3:1;

  /* We do not support palettized images. */
  if (BMP_HASPAL(info) && numcmpts == 3) {
    fprintf(stderr, "no palettized image support for BMP format\n");
    return -1;
  }

  ret = 0;
  for (i = 0; i < numcmpts; ++i) {
    bufs[i] = 0;
  }

  /* Create temporary matrices to hold component data. */
  for (i = 0; i < numcmpts; ++i) {
    if (!(bufs[i] = jas_matrix_create(1, info->width))) {
      ret = -1;
      goto bmp_putdata_done;
    }
  }

  /* Calculate number of padding bytes per row of image data. */
  numpad = (numcmpts * info->width) % 4;
  if (numpad) {
    numpad = 4 - numpad;
  }

  /* Put the image data. */
  for (i = info->height - 1; i >= 0; --i) {
    for (cmptno = 0; cmptno < numcmpts; ++cmptno) {
      if (jas_image_readcmpt(image, cmptno, 0, i, info->width,
        1, bufs[cmpts[cmptno]])) {
        ret = -1;
        goto bmp_putdata_done;
      }
    }
    for (j = 0; j < info->width; ++j) {
      if (numcmpts == 3) {
        red = (jas_matrix_getv(bufs[0], j));
        grn = (jas_matrix_getv(bufs[1], j));
        blu = (jas_matrix_getv(bufs[2], j));
        if (jas_stream_putc(out, blu) == EOF ||
          jas_stream_putc(out, grn) == EOF ||
          jas_stream_putc(out, red) == EOF) {
          ret = -1;
          goto bmp_putdata_done;
        }
      } else if (numcmpts == 1) {
        v = (jas_matrix_getv(bufs[cmpts[0]], j));
        if (jas_stream_putc(out, v) == EOF) {
          ret = -1;
          goto bmp_putdata_done;
        }
      } else {
        abort();
      }
    }
    for (j = numpad; j > 0; --j) {
      if (jas_stream_putc(out, 0) == EOF) {
        ret = -1;
        goto bmp_putdata_done;
      }
    }
  }

bmp_putdata_done:
  /* Destroy the temporary matrices. */
  for (i = 0; i < numcmpts; ++i) {
    if (bufs[i]) {
      jas_matrix_destroy(bufs[i]);
    }
  }

  return ret;
}

/******************************************************************************\
* Code for primitive types.
\******************************************************************************/

static int bmp_putint16(jas_stream_t *in, int_fast16_t val)
{
  if (jas_stream_putc(in, val & 0xff) == EOF || jas_stream_putc(in, (val >> 8) &
    0xff) == EOF) {
    return -1;
  }
  return 0;
}

static int bmp_putint32(jas_stream_t *out, int_fast32_t val)
{
  int n;
  int_fast32_t v;

  /* This code needs to be changed if we want to handle negative values. */
  assert(val >= 0);
  v = val;
  for (n = 4;;) {
    if (jas_stream_putc(out, v & 0xff) == EOF) {
      return -1;
    }
    if (--n <= 0) {
      break;
    }
    v >>= 8;
  }
  return 0;
}