/*

 * wrbmp.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1994-1996, Thomas G. Lane.

 * libjpeg-turbo Modifications:

 * Copyright (C) 2013, Linaro Limited.

 * Copyright (C) 2014-2015, 2017, 2019, 2022, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * file.

 *

 * This file contains routines to write output images in Microsoft "BMP"

 * format (MS Windows 3.x and OS/2 1.x flavors).

 * Either 8-bit colormapped or 24-bit full-color format can be written.

 * No compression is supported.

 *

 * These routines may need modification for non-Unix environments or

 * specialized applications.  As they stand, they assume output to

 * an ordinary stdio stream.

 *

 * This code contributed by James Arthur Boucher.

 */

#include "cmyk.h"

#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */

#include "jconfigint.h"

#ifdef BMP_SUPPORTED

/*

 * To support 12-bit JPEG data, we'd have to scale output down to 8 bits.

 * This is not yet implemented.

 */

#if BITS_IN_JSAMPLE != 8

  Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */

#endif

/*

 * Since BMP stores scanlines bottom-to-top, we have to invert the image

 * from JPEG's top-to-bottom order.  To do this, we save the outgoing data

 * in a virtual array during put_pixel_row calls, then actually emit the

 * BMP file during finish_output.  The virtual array contains one JSAMPLE per

 * pixel if the output is grayscale or colormapped, three if it is full color.

 */

/* Private version of data destination object */

typedef struct {

  struct djpeg_dest_struct pub; /* public fields */

  boolean is_os2;               /* saves the OS2 format request flag */

  jvirt_sarray_ptr whole_image; /* needed to reverse row order */

  JDIMENSION data_width;        /* JSAMPLEs per row */

  JDIMENSION row_width;         /* physical width of one row in the BMP file */

  int pad_bytes;                /* number of padding bytes needed per row */

  JDIMENSION cur_output_row;    /* next row# to write to virtual array */

  boolean use_inversion_array;  /* TRUE = buffer the whole image, which is

                                   stored to disk in bottom-up order, and

                                   receive rows from the calling program in

                                   top-down order

                                   FALSE = the calling program will maintain

                                   its own image buffer and write the rows in

                                   bottom-up order */

  JSAMPLE *iobuffer;            /* I/O buffer (used to buffer a single row to

                                   disk if use_inversion_array == FALSE) */

} bmp_dest_struct;

typedef bmp_dest_struct *bmp_dest_ptr;

/* Forward declarations */

LOCAL(void) write_colormap(j_decompress_ptr cinfo, bmp_dest_ptr dest,

                           int map_colors, int map_entry_size);

static INLINE boolean is_big_endian(void)

{

  int test_value = 1;

  if (*(char *)&test_value != 1)

    return TRUE;

  return FALSE;

}

/*

 * Write some pixel data.

 * In this module rows_supplied will always be 1.

 */

METHODDEF(void)

put_pixel_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,

               JDIMENSION rows_supplied)

/* This version is for writing 24-bit pixels */

{

  bmp_dest_ptr dest = (bmp_dest_ptr)dinfo;

  JSAMPARRAY image_ptr;

  register JSAMPROW inptr, outptr;

  register JDIMENSION col;

  int pad;

  if (dest->use_inversion_array) {

    /* Access next row in virtual array */

    image_ptr = (*cinfo->mem->access_virt_sarray)

      ((j_common_ptr)cinfo, dest->whole_image,

       dest->cur_output_row, (JDIMENSION)1, TRUE);

    dest->cur_output_row++;

    outptr = image_ptr[0];

  } else {

    outptr = dest->iobuffer;

  }

  /* Transfer data.  Note destination values must be in BGR order

   * (even though Microsoft's own documents say the opposite).

   */

  inptr = dest->pub.buffer[0];

  if (cinfo->out_color_space == JCS_EXT_BGR) {

    memcpy(outptr, inptr, dest->row_width);

    outptr += cinfo->output_width * 3;

  } else if (cinfo->out_color_space == JCS_RGB565) {

    boolean big_endian = is_big_endian();

    unsigned short *inptr2 = (unsigned short *)inptr;

    for (col = cinfo->output_width; col > 0; col--) {

      if (big_endian) {

        outptr[0] = (*inptr2 >> 5) & 0xF8;

        outptr[1] = ((*inptr2 << 5) & 0xE0) | ((*inptr2 >> 11) & 0x1C);

        outptr[2] = *inptr2 & 0xF8;

      } else {

        outptr[0] = (*inptr2 << 3) & 0xF8;

        outptr[1] = (*inptr2 >> 3) & 0xFC;

        outptr[2] = (*inptr2 >> 8) & 0xF8;

      }

      outptr += 3;

      inptr2++;

    }

  } else if (cinfo->out_color_space == JCS_CMYK) {

    for (col = cinfo->output_width; col > 0; col--) {

      JSAMPLE c = *inptr++, m = *inptr++, y = *inptr++, k = *inptr++;

      cmyk_to_rgb(c, m, y, k, outptr + 2, outptr + 1, outptr);

      outptr += 3;

    }

  } else {

    register int rindex = rgb_red[cinfo->out_color_space];

    register int gindex = rgb_green[cinfo->out_color_space];

    register int bindex = rgb_blue[cinfo->out_color_space];

    register int ps = rgb_pixelsize[cinfo->out_color_space];

    for (col = cinfo->output_width; col > 0; col--) {

      outptr[0] = inptr[bindex];

      outptr[1] = inptr[gindex];

      outptr[2] = inptr[rindex];

      outptr += 3;  inptr += ps;

    }

  }

  /* Zero out the pad bytes. */

  pad = dest->pad_bytes;

  while (--pad >= 0)

    *outptr++ = 0;

  if (!dest->use_inversion_array)

    fwrite(dest->iobuffer, 1, dest->row_width, dest->pub.output_file);

}

METHODDEF(void)

put_gray_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,

              JDIMENSION rows_supplied)

/* This version is for grayscale OR quantized color output */

{

  bmp_dest_ptr dest = (bmp_dest_ptr)dinfo;

  JSAMPARRAY image_ptr;

  register JSAMPROW inptr, outptr;

  int pad;

  if (dest->use_inversion_array) {

    /* Access next row in virtual array */

    image_ptr = (*cinfo->mem->access_virt_sarray)

      ((j_common_ptr)cinfo, dest->whole_image,

       dest->cur_output_row, (JDIMENSION)1, TRUE);

    dest->cur_output_row++;

    outptr = image_ptr[0];

  } else {

    outptr = dest->iobuffer;

  }

  /* Transfer data. */

  inptr = dest->pub.buffer[0];

  memcpy(outptr, inptr, cinfo->output_width);

  outptr += cinfo->output_width;

  /* Zero out the pad bytes. */

  pad = dest->pad_bytes;

  while (--pad >= 0)

    *outptr++ = 0;

  if (!dest->use_inversion_array)

    fwrite(dest->iobuffer, 1, dest->row_width, dest->pub.output_file);

}

/*

 * Finish up at the end of the file.

 *

 * Here is where we really output the BMP file.

 *

 * First, routines to write the Windows and OS/2 variants of the file header.

 */

LOCAL(void)

write_bmp_header(j_decompress_ptr cinfo, bmp_dest_ptr dest)

/* Write a Windows-style BMP file header, including colormap if needed */

{

  char bmpfileheader[14];

  char bmpinfoheader[40];

#define PUT_2B(array, offset, value) \

  (array[offset] = (char)((value) & 0xFF), \

   array[offset + 1] = (char)(((value) >> 8) & 0xFF))

#define PUT_4B(array, offset, value) \

  (array[offset] = (char)((value) & 0xFF), \

   array[offset + 1] = (char)(((value) >> 8) & 0xFF), \

   array[offset + 2] = (char)(((value) >> 16) & 0xFF), \

   array[offset + 3] = (char)(((value) >> 24) & 0xFF))

  long headersize, bfSize;

  int bits_per_pixel, cmap_entries;

  /* Compute colormap size and total file size */

  if (IsExtRGB(cinfo->out_color_space)) {

    if (cinfo->quantize_colors) {

      /* Colormapped RGB */

      bits_per_pixel = 8;

      cmap_entries = 256;

    } else {

      /* Unquantized, full color RGB */

      bits_per_pixel = 24;

      cmap_entries = 0;

    }

  } else if (cinfo->out_color_space == JCS_RGB565 ||

             cinfo->out_color_space == JCS_CMYK) {

    bits_per_pixel = 24;

    cmap_entries   = 0;

  } else {

    /* Grayscale output.  We need to fake a 256-entry colormap. */

    bits_per_pixel = 8;

    cmap_entries = 256;

  }

  /* File size */

  headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */

  bfSize = headersize + (long)dest->row_width * (long)cinfo->output_height;

  /* Set unused fields of header to 0 */

  memset(bmpfileheader, 0, sizeof(bmpfileheader));

  memset(bmpinfoheader, 0, sizeof(bmpinfoheader));

  /* Fill the file header */

  bmpfileheader[0] = 0x42;      /* first 2 bytes are ASCII 'B', 'M' */

  bmpfileheader[1] = 0x4D;

  PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */

  /* we leave bfReserved1 & bfReserved2 = 0 */

  PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */

  /* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */

  PUT_2B(bmpinfoheader, 0, 40); /* biSize */

  PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */

  PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */

  PUT_2B(bmpinfoheader, 12, 1); /* biPlanes - must be 1 */

  PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */

  /* we leave biCompression = 0, for none */

  /* we leave biSizeImage = 0; this is correct for uncompressed data */

  if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */

    PUT_4B(bmpinfoheader, 24, (long)(cinfo->X_density * 100)); /* XPels/M */

    PUT_4B(bmpinfoheader, 28, (long)(cinfo->Y_density * 100)); /* XPels/M */

  }

  PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */

  /* we leave biClrImportant = 0 */

  if (fwrite(bmpfileheader, 1, 14, dest->pub.output_file) != (size_t)14)

    ERREXIT(cinfo, JERR_FILE_WRITE);

  if (fwrite(bmpinfoheader, 1, 40, dest->pub.output_file) != (size_t)40)

    ERREXIT(cinfo, JERR_FILE_WRITE);

  if (cmap_entries > 0)

    write_colormap(cinfo, dest, cmap_entries, 4);

}

LOCAL(void)

write_os2_header(j_decompress_ptr cinfo, bmp_dest_ptr dest)

/* Write an OS2-style BMP file header, including colormap if needed */

{

  char bmpfileheader[14];

  char bmpcoreheader[12];

  long headersize, bfSize;

  int bits_per_pixel, cmap_entries;

  /* Compute colormap size and total file size */

  if (IsExtRGB(cinfo->out_color_space)) {

    if (cinfo->quantize_colors) {

      /* Colormapped RGB */

      bits_per_pixel = 8;

      cmap_entries = 256;

    } else {

      /* Unquantized, full color RGB */

      bits_per_pixel = 24;

      cmap_entries = 0;

    }

  } else if (cinfo->out_color_space == JCS_RGB565 ||

             cinfo->out_color_space == JCS_CMYK) {

    bits_per_pixel = 24;

    cmap_entries   = 0;

  } else {

    /* Grayscale output.  We need to fake a 256-entry colormap. */

    bits_per_pixel = 8;

    cmap_entries = 256;

  }

  /* File size */

  headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */

  bfSize = headersize + (long)dest->row_width * (long)cinfo->output_height;

  /* Set unused fields of header to 0 */

  memset(bmpfileheader, 0, sizeof(bmpfileheader));

  memset(bmpcoreheader, 0, sizeof(bmpcoreheader));

  /* Fill the file header */

  bmpfileheader[0] = 0x42;      /* first 2 bytes are ASCII 'B', 'M' */

  bmpfileheader[1] = 0x4D;

  PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */

  /* we leave bfReserved1 & bfReserved2 = 0 */

  PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */

  /* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */

  PUT_2B(bmpcoreheader, 0, 12); /* bcSize */

  PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */

  PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */

  PUT_2B(bmpcoreheader, 8, 1);  /* bcPlanes - must be 1 */

  PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */

  if (fwrite(bmpfileheader, 1, 14, dest->pub.output_file) != (size_t)14)

    ERREXIT(cinfo, JERR_FILE_WRITE);

  if (fwrite(bmpcoreheader, 1, 12, dest->pub.output_file) != (size_t)12)

    ERREXIT(cinfo, JERR_FILE_WRITE);

  if (cmap_entries > 0)

    write_colormap(cinfo, dest, cmap_entries, 3);

}

/*

 * Write the colormap.

 * Windows uses BGR0 map entries; OS/2 uses BGR entries.

 */

LOCAL(void)

write_colormap(j_decompress_ptr cinfo, bmp_dest_ptr dest, int map_colors,

               int map_entry_size)

{

  JSAMPARRAY colormap = cinfo->colormap;

  int num_colors = cinfo->actual_number_of_colors;

  FILE *outfile = dest->pub.output_file;

  int i;

  if (colormap != NULL) {

    if (cinfo->out_color_components == 3) {

      /* Normal case with RGB colormap */

      for (i = 0; i < num_colors; i++) {

        putc(colormap[2][i], outfile);

        putc(colormap[1][i], outfile);

        putc(colormap[0][i], outfile);

        if (map_entry_size == 4)

          putc(0, outfile);

      }

    } else {

      /* Grayscale colormap (only happens with grayscale quantization) */

      for (i = 0; i < num_colors; i++) {

        putc(colormap[0][i], outfile);

        putc(colormap[0][i], outfile);

        putc(colormap[0][i], outfile);

        if (map_entry_size == 4)

          putc(0, outfile);

      }

    }

  } else {

    /* If no colormap, must be grayscale data.  Generate a linear "map". */

    for (i = 0; i < 256; i++) {

      putc(i, outfile);

      putc(i, outfile);

      putc(i, outfile);

      if (map_entry_size == 4)

        putc(0, outfile);

    }

  }

  /* Pad colormap with zeros to ensure specified number of colormap entries */

  if (i > map_colors)

    ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, i);

  for (; i < map_colors; i++) {

    putc(0, outfile);

    putc(0, outfile);

    putc(0, outfile);

    if (map_entry_size == 4)

      putc(0, outfile);

  }

}

/*

 * Startup: write the file header unless the inversion array is being used.

 */

METHODDEF(void)

start_output_bmp(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)

{

  bmp_dest_ptr dest = (bmp_dest_ptr)dinfo;

  if (!dest->use_inversion_array) {

    /* Write the header and colormap */

    if (dest->is_os2)

      write_os2_header(cinfo, dest);

    else

      write_bmp_header(cinfo, dest);

  }

}

METHODDEF(void)

finish_output_bmp(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)

{

  bmp_dest_ptr dest = (bmp_dest_ptr)dinfo;

  register FILE *outfile = dest->pub.output_file;

  JSAMPARRAY image_ptr;

  register JSAMPROW data_ptr;

  JDIMENSION row;

  cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;

  if (dest->use_inversion_array) {

    /* Write the header and colormap */

    if (dest->is_os2)

      write_os2_header(cinfo, dest);

    else

      write_bmp_header(cinfo, dest);

    /* Write the file body from our virtual array */

    for (row = cinfo->output_height; row > 0; row--) {

      if (progress != NULL) {

        progress->pub.pass_counter = (long)(cinfo->output_height - row);

        progress->pub.pass_limit = (long)cinfo->output_height;

        (*progress->pub.progress_monitor) ((j_common_ptr)cinfo);

      }

      image_ptr = (*cinfo->mem->access_virt_sarray)

        ((j_common_ptr)cinfo, dest->whole_image, row - 1, (JDIMENSION)1,

         FALSE);

      data_ptr = image_ptr[0];

      fwrite(data_ptr, 1, dest->row_width, outfile);

    }

    if (progress != NULL)

      progress->completed_extra_passes++;

  }

  /* Make sure we wrote the output file OK */

  fflush(outfile);

  if (ferror(outfile))

    ERREXIT(cinfo, JERR_FILE_WRITE);

}

/*

 * The module selection routine for BMP format output.

 */

GLOBAL(djpeg_dest_ptr)

jinit_write_bmp(j_decompress_ptr cinfo, boolean is_os2,

                boolean use_inversion_array)

{

  bmp_dest_ptr dest;

  JDIMENSION row_width;

  if (cinfo->data_precision != 8)

    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

  /* Create module interface object, fill in method pointers */

  dest = (bmp_dest_ptr)

    (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,

                                sizeof(bmp_dest_struct));

  dest->pub.start_output = start_output_bmp;

  dest->pub.finish_output = finish_output_bmp;

  dest->pub.calc_buffer_dimensions = NULL;

  dest->is_os2 = is_os2;

  if (cinfo->out_color_space == JCS_GRAYSCALE) {

    dest->pub.put_pixel_rows = put_gray_rows;

  } else if (IsExtRGB(cinfo->out_color_space)) {

    if (cinfo->quantize_colors)

      dest->pub.put_pixel_rows = put_gray_rows;

    else

      dest->pub.put_pixel_rows = put_pixel_rows;

  } else if (!cinfo->quantize_colors &&

             (cinfo->out_color_space == JCS_RGB565 ||

              cinfo->out_color_space == JCS_CMYK)) {

    dest->pub.put_pixel_rows = put_pixel_rows;

  } else {

    ERREXIT(cinfo, JERR_BMP_COLORSPACE);

  }

  /* Calculate output image dimensions so we can allocate space */

  jpeg_calc_output_dimensions(cinfo);

  /* Determine width of rows in the BMP file (padded to 4-byte boundary). */

  if (cinfo->out_color_space == JCS_RGB565) {

    row_width = cinfo->output_width * 2;

    dest->row_width = dest->data_width = cinfo->output_width * 3;

    while ((row_width & 3) != 0) row_width++;

  } else if (!cinfo->quantize_colors &&

             (IsExtRGB(cinfo->out_color_space) ||

              cinfo->out_color_space == JCS_CMYK)) {

    row_width = cinfo->output_width * cinfo->output_components;

    dest->row_width = dest->data_width = cinfo->output_width * 3;

  } else {

    row_width = cinfo->output_width * cinfo->output_components;

    dest->row_width = dest->data_width = row_width;

  }

  while ((dest->row_width & 3) != 0) dest->row_width++;

  dest->pad_bytes = (int)(dest->row_width - dest->data_width);

  if (use_inversion_array) {

    /* Allocate space for inversion array, prepare for write pass */

    dest->whole_image = (*cinfo->mem->request_virt_sarray)

      ((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE,

       dest->row_width, cinfo->output_height, (JDIMENSION)1);

    dest->cur_output_row = 0;

    if (cinfo->progress != NULL) {

      cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;

      progress->total_extra_passes++; /* count file input as separate pass */

    }

  } else {

    dest->iobuffer = (JSAMPLE *)(*cinfo->mem->alloc_small)

      ((j_common_ptr)cinfo, JPOOL_IMAGE, dest->row_width);

  }

  dest->use_inversion_array = use_inversion_array;

  /* Create decompressor output buffer. */

  dest->pub.buffer = (*cinfo->mem->alloc_sarray)

    ((j_common_ptr)cinfo, JPOOL_IMAGE, row_width, (JDIMENSION)1);

  dest->pub.buffer_height = 1;

  return (djpeg_dest_ptr)dest;

}

#endif /* BMP_SUPPORTED */