/*
 * 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) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 *
 * 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
 *
 * $Id$
 */

/******************************************************************************\
* 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) {
        jas_eprintf("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) {
            jas_eprintf("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) {
        jas_eprintf("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;
}
