Repo created

2025-11-22 14:04:28 +01:00 · 2025-11-22 14:04:28 +01:00 · f8c34fa5ee
commit f8c34fa5ee
parent 81b91f4139
22732 changed files with 4815320 additions and 2 deletions
--- a/TMessagesProj/jni/mozjpeg/rdbmp.c
+++ b/TMessagesProj/jni/mozjpeg/rdbmp.c
@ -0,0 +1,689 @@
+/*
+ * rdbmp.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * Modified 2009-2017 by Guido Vollbeding.
+ * libjpeg-turbo Modifications:
+ * Modified 2011 by Siarhei Siamashka.
+ * Copyright (C) 2015, 2017-2018, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
+ *
+ * This file contains routines to read input images in Microsoft "BMP"
+ * format (MS Windows 3.x, OS/2 1.x, and OS/2 2.x flavors).
+ * Currently, only 8-bit and 24-bit images are supported, not 1-bit or
+ * 4-bit (feeding such low-depth images into JPEG would be silly anyway).
+ * Also, we don't support RLE-compressed files.
+ *
+ * These routines may need modification for non-Unix environments or
+ * specialized applications.  As they stand, they assume input from
+ * an ordinary stdio stream.  They further assume that reading begins
+ * at the start of the file; start_input may need work if the
+ * user interface has already read some data (e.g., to determine that
+ * the file is indeed BMP format).
+ *
+ * This code contributed by James Arthur Boucher.
+ */
+
+#include "cmyk.h"
+#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
+
+#ifdef BMP_SUPPORTED
+
+
+/* Macros to deal with unsigned chars as efficiently as compiler allows */
+
+#ifdef HAVE_UNSIGNED_CHAR
+typedef unsigned char U_CHAR;
+#define UCH(x)  ((int)(x))
+#else /* !HAVE_UNSIGNED_CHAR */
+#ifdef __CHAR_UNSIGNED__
+typedef char U_CHAR;
+#define UCH(x)  ((int)(x))
+#else
+typedef char U_CHAR;
+#define UCH(x)  ((int)(x) & 0xFF)
+#endif
+#endif /* HAVE_UNSIGNED_CHAR */
+
+
+#define ReadOK(file, buffer, len) \
+  (JFREAD(file, buffer, len) == ((size_t)(len)))
+
+static int alpha_index[JPEG_NUMCS] = {
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1
+};
+
+
+/* Private version of data source object */
+
+typedef struct _bmp_source_struct *bmp_source_ptr;
+
+typedef struct _bmp_source_struct {
+  struct cjpeg_source_struct pub; /* public fields */
+
+  j_compress_ptr cinfo;         /* back link saves passing separate parm */
+
+  JSAMPARRAY colormap;          /* BMP colormap (converted to my format) */
+
+  jvirt_sarray_ptr whole_image; /* Needed to reverse row order */
+  JDIMENSION source_row;        /* Current source row number */
+  JDIMENSION row_width;         /* Physical width of scanlines in file */
+
+  int bits_per_pixel;           /* remembers 8- or 24-bit format */
+  int cmap_length;              /* colormap length */
+
+  boolean use_inversion_array;  /* TRUE = preload the whole image, which is
+                                   stored in bottom-up order, and feed it to
+                                   the calling program in top-down order
+
+                                   FALSE = the calling program will maintain
+                                   its own image buffer and read the rows in
+                                   bottom-up order */
+
+  U_CHAR *iobuffer;             /* I/O buffer (used to buffer a single row from
+                                   disk if use_inversion_array == FALSE) */
+} bmp_source_struct;
+
+
+LOCAL(int)
+read_byte(bmp_source_ptr sinfo)
+/* Read next byte from BMP file */
+{
+  register FILE *infile = sinfo->pub.input_file;
+  register int c;
+
+  if ((c = getc(infile)) == EOF)
+    ERREXIT(sinfo->cinfo, JERR_INPUT_EOF);
+  return c;
+}
+
+
+LOCAL(void)
+read_colormap(bmp_source_ptr sinfo, int cmaplen, int mapentrysize)
+/* Read the colormap from a BMP file */
+{
+  int i, gray = 1;
+
+  switch (mapentrysize) {
+  case 3:
+    /* BGR format (occurs in OS/2 files) */
+    for (i = 0; i < cmaplen; i++) {
+      sinfo->colormap[2][i] = (JSAMPLE)read_byte(sinfo);
+      sinfo->colormap[1][i] = (JSAMPLE)read_byte(sinfo);
+      sinfo->colormap[0][i] = (JSAMPLE)read_byte(sinfo);
+      if (sinfo->colormap[2][i] != sinfo->colormap[1][i] ||
+          sinfo->colormap[1][i] != sinfo->colormap[0][i])
+        gray = 0;
+    }
+    break;
+  case 4:
+    /* BGR0 format (occurs in MS Windows files) */
+    for (i = 0; i < cmaplen; i++) {
+      sinfo->colormap[2][i] = (JSAMPLE)read_byte(sinfo);
+      sinfo->colormap[1][i] = (JSAMPLE)read_byte(sinfo);
+      sinfo->colormap[0][i] = (JSAMPLE)read_byte(sinfo);
+      (void)read_byte(sinfo);
+      if (sinfo->colormap[2][i] != sinfo->colormap[1][i] ||
+          sinfo->colormap[1][i] != sinfo->colormap[0][i])
+        gray = 0;
+    }
+    break;
+  default:
+    ERREXIT(sinfo->cinfo, JERR_BMP_BADCMAP);
+    break;
+  }
+
+  if (sinfo->cinfo->in_color_space == JCS_UNKNOWN && gray)
+    sinfo->cinfo->in_color_space = JCS_GRAYSCALE;
+
+  if (sinfo->cinfo->in_color_space == JCS_GRAYSCALE && !gray)
+    ERREXIT(sinfo->cinfo, JERR_BAD_IN_COLORSPACE);
+}
+
+
+/*
+ * Read one row of pixels.
+ * The image has been read into the whole_image array, but is otherwise
+ * unprocessed.  We must read it out in top-to-bottom row order, and if
+ * it is an 8-bit image, we must expand colormapped pixels to 24bit format.
+ */
+
+METHODDEF(JDIMENSION)
+get_8bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 8-bit colormap indexes */
+{
+  bmp_source_ptr source = (bmp_source_ptr)sinfo;
+  register JSAMPARRAY colormap = source->colormap;
+  int cmaplen = source->cmap_length;
+  JSAMPARRAY image_ptr;
+  register int t;
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+
+  if (source->use_inversion_array) {
+    /* Fetch next row from virtual array */
+    source->source_row--;
+    image_ptr = (*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, source->whole_image,
+       source->source_row, (JDIMENSION)1, FALSE);
+    inptr = image_ptr[0];
+  } else {
+    if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
+      ERREXIT(cinfo, JERR_INPUT_EOF);
+    inptr = source->iobuffer;
+  }
+
+  /* Expand the colormap indexes to real data */
+  outptr = source->pub.buffer[0];
+  if (cinfo->in_color_space == JCS_GRAYSCALE) {
+    for (col = cinfo->image_width; col > 0; col--) {
+      t = GETJSAMPLE(*inptr++);
+      if (t >= cmaplen)
+        ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
+      *outptr++ = colormap[0][t];
+    }
+  } else if (cinfo->in_color_space == JCS_CMYK) {
+    for (col = cinfo->image_width; col > 0; col--) {
+      t = GETJSAMPLE(*inptr++);
+      if (t >= cmaplen)
+        ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
+      rgb_to_cmyk(colormap[0][t], colormap[1][t], colormap[2][t], outptr,
+                  outptr + 1, outptr + 2, outptr + 3);
+      outptr += 4;
+    }
+  } else {
+    register int rindex = rgb_red[cinfo->in_color_space];
+    register int gindex = rgb_green[cinfo->in_color_space];
+    register int bindex = rgb_blue[cinfo->in_color_space];
+    register int aindex = alpha_index[cinfo->in_color_space];
+    register int ps = rgb_pixelsize[cinfo->in_color_space];
+
+    if (aindex >= 0) {
+      for (col = cinfo->image_width; col > 0; col--) {
+        t = GETJSAMPLE(*inptr++);
+        if (t >= cmaplen)
+          ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
+        outptr[rindex] = colormap[0][t];
+        outptr[gindex] = colormap[1][t];
+        outptr[bindex] = colormap[2][t];
+        outptr[aindex] = 0xFF;
+        outptr += ps;
+      }
+    } else {
+      for (col = cinfo->image_width; col > 0; col--) {
+        t = GETJSAMPLE(*inptr++);
+        if (t >= cmaplen)
+          ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
+        outptr[rindex] = colormap[0][t];
+        outptr[gindex] = colormap[1][t];
+        outptr[bindex] = colormap[2][t];
+        outptr += ps;
+      }
+    }
+  }
+
+  return 1;
+}
+
+
+METHODDEF(JDIMENSION)
+get_24bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 24-bit pixels */
+{
+  bmp_source_ptr source = (bmp_source_ptr)sinfo;
+  JSAMPARRAY image_ptr;
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+
+  if (source->use_inversion_array) {
+    /* Fetch next row from virtual array */
+    source->source_row--;
+    image_ptr = (*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, source->whole_image,
+       source->source_row, (JDIMENSION)1, FALSE);
+    inptr = image_ptr[0];
+  } else {
+    if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
+      ERREXIT(cinfo, JERR_INPUT_EOF);
+    inptr = source->iobuffer;
+  }
+
+  /* Transfer data.  Note source values are in BGR order
+   * (even though Microsoft's own documents say the opposite).
+   */
+  outptr = source->pub.buffer[0];
+  if (cinfo->in_color_space == JCS_EXT_BGR) {
+    MEMCOPY(outptr, inptr, source->row_width);
+  } else if (cinfo->in_color_space == JCS_CMYK) {
+    for (col = cinfo->image_width; col > 0; col--) {
+      /* can omit GETJSAMPLE() safely */
+      JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++;
+      rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3);
+      outptr += 4;
+    }
+  } else {
+    register int rindex = rgb_red[cinfo->in_color_space];
+    register int gindex = rgb_green[cinfo->in_color_space];
+    register int bindex = rgb_blue[cinfo->in_color_space];
+    register int aindex = alpha_index[cinfo->in_color_space];
+    register int ps = rgb_pixelsize[cinfo->in_color_space];
+
+    if (aindex >= 0) {
+      for (col = cinfo->image_width; col > 0; col--) {
+        outptr[bindex] = *inptr++;      /* can omit GETJSAMPLE() safely */
+        outptr[gindex] = *inptr++;
+        outptr[rindex] = *inptr++;
+        outptr[aindex] = 0xFF;
+        outptr += ps;
+      }
+    } else {
+      for (col = cinfo->image_width; col > 0; col--) {
+        outptr[bindex] = *inptr++;      /* can omit GETJSAMPLE() safely */
+        outptr[gindex] = *inptr++;
+        outptr[rindex] = *inptr++;
+        outptr += ps;
+      }
+    }
+  }
+
+  return 1;
+}
+
+
+METHODDEF(JDIMENSION)
+get_32bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 32-bit pixels */
+{
+  bmp_source_ptr source = (bmp_source_ptr)sinfo;
+  JSAMPARRAY image_ptr;
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+
+  if (source->use_inversion_array) {
+    /* Fetch next row from virtual array */
+    source->source_row--;
+    image_ptr = (*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, source->whole_image,
+       source->source_row, (JDIMENSION)1, FALSE);
+    inptr = image_ptr[0];
+  } else {
+    if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
+      ERREXIT(cinfo, JERR_INPUT_EOF);
+    inptr = source->iobuffer;
+  }
+
+  /* Transfer data.  Note source values are in BGR order
+   * (even though Microsoft's own documents say the opposite).
+   */
+  outptr = source->pub.buffer[0];
+  if (cinfo->in_color_space == JCS_EXT_BGRX ||
+      cinfo->in_color_space == JCS_EXT_BGRA) {
+    MEMCOPY(outptr, inptr, source->row_width);
+  } else if (cinfo->in_color_space == JCS_CMYK) {
+    for (col = cinfo->image_width; col > 0; col--) {
+      /* can omit GETJSAMPLE() safely */
+      JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++;
+      rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3);
+      inptr++;                          /* skip the 4th byte (Alpha channel) */
+      outptr += 4;
+    }
+  } else {
+    register int rindex = rgb_red[cinfo->in_color_space];
+    register int gindex = rgb_green[cinfo->in_color_space];
+    register int bindex = rgb_blue[cinfo->in_color_space];
+    register int aindex = alpha_index[cinfo->in_color_space];
+    register int ps = rgb_pixelsize[cinfo->in_color_space];
+
+    if (aindex >= 0) {
+      for (col = cinfo->image_width; col > 0; col--) {
+        outptr[bindex] = *inptr++;      /* can omit GETJSAMPLE() safely */
+        outptr[gindex] = *inptr++;
+        outptr[rindex] = *inptr++;
+        outptr[aindex] = *inptr++;
+        outptr += ps;
+      }
+    } else {
+      for (col = cinfo->image_width; col > 0; col--) {
+        outptr[bindex] = *inptr++;      /* can omit GETJSAMPLE() safely */
+        outptr[gindex] = *inptr++;
+        outptr[rindex] = *inptr++;
+        inptr++;                        /* skip the 4th byte (Alpha channel) */
+        outptr += ps;
+      }
+    }
+  }
+
+  return 1;
+}
+
+
+/*
+ * This method loads the image into whole_image during the first call on
+ * get_pixel_rows.  The get_pixel_rows pointer is then adjusted to call
+ * get_8bit_row, get_24bit_row, or get_32bit_row on subsequent calls.
+ */
+
+METHODDEF(JDIMENSION)
+preload_image(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  bmp_source_ptr source = (bmp_source_ptr)sinfo;
+  register FILE *infile = source->pub.input_file;
+  register JSAMPROW out_ptr;
+  JSAMPARRAY image_ptr;
+  JDIMENSION row;
+  cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;
+
+  /* Read the data into a virtual array in input-file row order. */
+  for (row = 0; row < cinfo->image_height; row++) {
+    if (progress != NULL) {
+      progress->pub.pass_counter = (long)row;
+      progress->pub.pass_limit = (long)cinfo->image_height;
+      (*progress->pub.progress_monitor) ((j_common_ptr)cinfo);
+    }
+    image_ptr = (*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, source->whole_image, row, (JDIMENSION)1, TRUE);
+    out_ptr = image_ptr[0];
+    if (fread(out_ptr, 1, source->row_width, infile) != source->row_width) {
+      if (feof(infile))
+        ERREXIT(cinfo, JERR_INPUT_EOF);
+      else
+        ERREXIT(cinfo, JERR_FILE_READ);
+    }
+  }
+  if (progress != NULL)
+    progress->completed_extra_passes++;
+
+  /* Set up to read from the virtual array in top-to-bottom order */
+  switch (source->bits_per_pixel) {
+  case 8:
+    source->pub.get_pixel_rows = get_8bit_row;
+    break;
+  case 24:
+    source->pub.get_pixel_rows = get_24bit_row;
+    break;
+  case 32:
+    source->pub.get_pixel_rows = get_32bit_row;
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+  }
+  source->source_row = cinfo->image_height;
+
+  /* And read the first row */
+  return (*source->pub.get_pixel_rows) (cinfo, sinfo);
+}
+
+
+/*
+ * Read the file header; return image size and component count.
+ */
+
+METHODDEF(void)
+start_input_bmp(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  bmp_source_ptr source = (bmp_source_ptr)sinfo;
+  U_CHAR bmpfileheader[14];
+  U_CHAR bmpinfoheader[64];
+
+#define GET_2B(array, offset) \
+  ((unsigned short)UCH(array[offset]) + \
+   (((unsigned short)UCH(array[offset + 1])) << 8))
+#define GET_4B(array, offset) \
+  ((unsigned int)UCH(array[offset]) + \
+   (((unsigned int)UCH(array[offset + 1])) << 8) + \
+   (((unsigned int)UCH(array[offset + 2])) << 16) + \
+   (((unsigned int)UCH(array[offset + 3])) << 24))
+
+  unsigned int bfOffBits;
+  unsigned int headerSize;
+  int biWidth;
+  int biHeight;
+  unsigned short biPlanes;
+  unsigned int biCompression;
+  int biXPelsPerMeter, biYPelsPerMeter;
+  unsigned int biClrUsed = 0;
+  int mapentrysize = 0;         /* 0 indicates no colormap */
+  int bPad;
+  JDIMENSION row_width = 0;
+
+  /* Read and verify the bitmap file header */
+  if (!ReadOK(source->pub.input_file, bmpfileheader, 14))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+  if (GET_2B(bmpfileheader, 0) != 0x4D42) /* 'BM' */
+    ERREXIT(cinfo, JERR_BMP_NOT);
+  bfOffBits = GET_4B(bmpfileheader, 10);
+  /* We ignore the remaining fileheader fields */
+
+  /* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
+   * or 64 bytes (OS/2 2.x).  Check the first 4 bytes to find out which.
+   */
+  if (!ReadOK(source->pub.input_file, bmpinfoheader, 4))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+  headerSize = GET_4B(bmpinfoheader, 0);
+  if (headerSize < 12 || headerSize > 64)
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+  if (!ReadOK(source->pub.input_file, bmpinfoheader + 4, headerSize - 4))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+
+  switch (headerSize) {
+  case 12:
+    /* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
+    biWidth = (int)GET_2B(bmpinfoheader, 4);
+    biHeight = (int)GET_2B(bmpinfoheader, 6);
+    biPlanes = GET_2B(bmpinfoheader, 8);
+    source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 10);
+
+    switch (source->bits_per_pixel) {
+    case 8:                     /* colormapped image */
+      mapentrysize = 3;         /* OS/2 uses RGBTRIPLE colormap */
+      TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, biWidth, biHeight);
+      break;
+    case 24:                    /* RGB image */
+      TRACEMS2(cinfo, 1, JTRC_BMP_OS2, biWidth, biHeight);
+      break;
+    default:
+      ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+      break;
+    }
+    break;
+  case 40:
+  case 64:
+    /* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
+    /* or OS/2 2.x header, which has additional fields that we ignore */
+    biWidth = (int)GET_4B(bmpinfoheader, 4);
+    biHeight = (int)GET_4B(bmpinfoheader, 8);
+    biPlanes = GET_2B(bmpinfoheader, 12);
+    source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 14);
+    biCompression = GET_4B(bmpinfoheader, 16);
+    biXPelsPerMeter = (int)GET_4B(bmpinfoheader, 24);
+    biYPelsPerMeter = (int)GET_4B(bmpinfoheader, 28);
+    biClrUsed = GET_4B(bmpinfoheader, 32);
+    /* biSizeImage, biClrImportant fields are ignored */
+
+    switch (source->bits_per_pixel) {
+    case 8:                     /* colormapped image */
+      mapentrysize = 4;         /* Windows uses RGBQUAD colormap */
+      TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, biWidth, biHeight);
+      break;
+    case 24:                    /* RGB image */
+      TRACEMS2(cinfo, 1, JTRC_BMP, biWidth, biHeight);
+      break;
+    case 32:                    /* RGB image + Alpha channel */
+      TRACEMS2(cinfo, 1, JTRC_BMP, biWidth, biHeight);
+      break;
+    default:
+      ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+      break;
+    }
+    if (biCompression != 0)
+      ERREXIT(cinfo, JERR_BMP_COMPRESSED);
+
+    if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) {
+      /* Set JFIF density parameters from the BMP data */
+      cinfo->X_density = (UINT16)(biXPelsPerMeter / 100); /* 100 cm per meter */
+      cinfo->Y_density = (UINT16)(biYPelsPerMeter / 100);
+      cinfo->density_unit = 2;  /* dots/cm */
+    }
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+    return;
+  }
+
+  if (biWidth <= 0 || biHeight <= 0 || biWidth > 0x7fffffffL || biHeight > 0x7fffffffL)
+    ERREXIT(cinfo, JERR_BMP_EMPTY);
+  if (biPlanes != 1)
+    ERREXIT(cinfo, JERR_BMP_BADPLANES);
+
+  /* Compute distance to bitmap data --- will adjust for colormap below */
+  bPad = bfOffBits - (headerSize + 14);
+
+  /* Read the colormap, if any */
+  if (mapentrysize > 0) {
+    if (biClrUsed <= 0)
+      biClrUsed = 256;          /* assume it's 256 */
+    else if (biClrUsed > 256)
+      ERREXIT(cinfo, JERR_BMP_BADCMAP);
+    /* Allocate space to store the colormap */
+    source->colormap = (*cinfo->mem->alloc_sarray)
+      ((j_common_ptr)cinfo, JPOOL_IMAGE, (JDIMENSION)biClrUsed, (JDIMENSION)3);
+    source->cmap_length = (int)biClrUsed;
+    /* and read it from the file */
+    read_colormap(source, (int)biClrUsed, mapentrysize);
+    /* account for size of colormap */
+    bPad -= biClrUsed * mapentrysize;
+  }
+
+  /* Skip any remaining pad bytes */
+  if (bPad < 0)                 /* incorrect bfOffBits value? */
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+  while (--bPad >= 0) {
+    (void)read_byte(source);
+  }
+
+  /* Compute row width in file, including padding to 4-byte boundary */
+  switch (source->bits_per_pixel) {
+  case 8:
+    if (cinfo->in_color_space == JCS_UNKNOWN)
+      cinfo->in_color_space = JCS_EXT_RGB;
+    if (IsExtRGB(cinfo->in_color_space))
+      cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
+    else if (cinfo->in_color_space == JCS_GRAYSCALE)
+      cinfo->input_components = 1;
+    else if (cinfo->in_color_space == JCS_CMYK)
+      cinfo->input_components = 4;
+    else
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    row_width = (JDIMENSION)biWidth;
+    break;
+  case 24:
+    if (cinfo->in_color_space == JCS_UNKNOWN)
+      cinfo->in_color_space = JCS_EXT_BGR;
+    if (IsExtRGB(cinfo->in_color_space))
+      cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
+    else if (cinfo->in_color_space == JCS_CMYK)
+      cinfo->input_components = 4;
+    else
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    row_width = (JDIMENSION)(biWidth * 3);
+    break;
+  case 32:
+    if (cinfo->in_color_space == JCS_UNKNOWN)
+      cinfo->in_color_space = JCS_EXT_BGRA;
+    if (IsExtRGB(cinfo->in_color_space))
+      cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
+    else if (cinfo->in_color_space == JCS_CMYK)
+      cinfo->input_components = 4;
+    else
+      ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
+    row_width = (JDIMENSION)(biWidth * 4);
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+  }
+  while ((row_width & 3) != 0) row_width++;
+  source->row_width = row_width;
+
+  if (source->use_inversion_array) {
+    /* Allocate space for inversion array, prepare for preload pass */
+    source->whole_image = (*cinfo->mem->request_virt_sarray)
+      ((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE,
+       row_width, (JDIMENSION)biHeight, (JDIMENSION)1);
+    source->pub.get_pixel_rows = preload_image;
+    if (cinfo->progress != NULL) {
+      cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;
+      progress->total_extra_passes++; /* count file input as separate pass */
+    }
+  } else {
+    source->iobuffer = (U_CHAR *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, row_width);
+    switch (source->bits_per_pixel) {
+    case 8:
+      source->pub.get_pixel_rows = get_8bit_row;
+      break;
+    case 24:
+      source->pub.get_pixel_rows = get_24bit_row;
+      break;
+    case 32:
+      source->pub.get_pixel_rows = get_32bit_row;
+      break;
+    default:
+      ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+    }
+  }
+
+  /* Ensure that biWidth * cinfo->input_components doesn't exceed the maximum
+     value of the JDIMENSION type.  This is only a danger with BMP files, since
+     their width and height fields are 32-bit integers. */
+  if ((unsigned long long)biWidth *
+      (unsigned long long)cinfo->input_components > 0xFFFFFFFFULL)
+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
+  /* Allocate one-row buffer for returned data */
+  source->pub.buffer = (*cinfo->mem->alloc_sarray)
+    ((j_common_ptr)cinfo, JPOOL_IMAGE,
+     (JDIMENSION)(biWidth * cinfo->input_components), (JDIMENSION)1);
+  source->pub.buffer_height = 1;
+
+  cinfo->data_precision = 8;
+  cinfo->image_width = (JDIMENSION)biWidth;
+  cinfo->image_height = (JDIMENSION)biHeight;
+}
+
+
+/*
+ * Finish up at the end of the file.
+ */
+
+METHODDEF(void)
+finish_input_bmp(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  /* no work */
+}
+
+
+/*
+ * The module selection routine for BMP format input.
+ */
+
+GLOBAL(cjpeg_source_ptr)
+jinit_read_bmp(j_compress_ptr cinfo, boolean use_inversion_array)
+{
+  bmp_source_ptr source;
+
+  /* Create module interface object */
+  source = (bmp_source_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+                                sizeof(bmp_source_struct));
+  source->cinfo = cinfo;        /* make back link for subroutines */
+  /* Fill in method ptrs, except get_pixel_rows which start_input sets */
+  source->pub.start_input = start_input_bmp;
+  source->pub.finish_input = finish_input_bmp;
+
+  source->use_inversion_array = use_inversion_array;
+
+  return (cjpeg_source_ptr)source;
+}
+
+#endif /* BMP_SUPPORTED */