Diff: includes/wrbmp.c

Revision:

0:791a779d6220

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/includes/wrbmp.c	Mon Jul 31 09:16:35 2017 +0000
@@ -0,0 +1,442 @@
+/*
+ * wrbmp.c
+ *
+ * Copyright (C) 1994-1996, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README 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 "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
+
+#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 */
+} bmp_dest_struct;
+
+typedef bmp_dest_struct * bmp_dest_ptr;
+
+
+/* Forward declarations */
+LOCAL(void) write_colormap
+	JPP((j_decompress_ptr cinfo, bmp_dest_ptr dest,
+	     int map_colors, int map_entry_size));
+
+
+/*
+ * 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;
+
+  /* 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++;
+
+  /* Transfer data.  Note destination values must be in BGR order
+   * (even though Microsoft's own documents say the opposite).
+   */
+  inptr = dest->pub.buffer[0];
+  outptr = image_ptr[0];
+  for (col = cinfo->output_width; col > 0; col--) {
+    outptr[2] = *inptr++;	/* can omit GETJSAMPLE() safely */
+    outptr[1] = *inptr++;
+    outptr[0] = *inptr++;
+    outptr += 3;
+  }
+
+  /* Zero out the pad bytes. */
+  pad = dest->pad_bytes;
+  while (--pad >= 0)
+    *outptr++ = 0;
+}
+
+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;
+  register JDIMENSION col;
+  int pad;
+
+  /* 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++;
+
+  /* Transfer data. */
+  inptr = dest->pub.buffer[0];
+  outptr = image_ptr[0];
+  for (col = cinfo->output_width; col > 0; col--) {
+    *outptr++ = *inptr++;	/* can omit GETJSAMPLE() safely */
+  }
+
+  /* Zero out the pad bytes. */
+  pad = dest->pad_bytes;
+  while (--pad >= 0)
+    *outptr++ = 0;
+}
+
+
+/*
+ * Startup: normally writes the file header.
+ * In this module we may as well postpone everything until finish_output.
+ */
+
+METHODDEF(void)
+start_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
+{
+  /* no work here */
+}
+
+
+/*
+ * 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))
+  INT32 headersize, bfSize;
+  int bits_per_pixel, cmap_entries;
+
+  /* Compute colormap size and total file size */
+  if (cinfo->out_color_space == JCS_RGB) {
+    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 {
+    /* 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 + (INT32) dest->row_width * (INT32) cinfo->output_height;
+  
+  /* Set unused fields of header to 0 */
+  MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
+  MEMZERO(bmpinfoheader, 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, (INT32) (cinfo->X_density*100)); /* XPels/M */
+    PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); /* XPels/M */
+  }
+  PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */
+  /* we leave biClrImportant = 0 */
+
+  if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
+    ERREXIT(cinfo, JERR_FILE_WRITE);
+  if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (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];
+  INT32 headersize, bfSize;
+  int bits_per_pixel, cmap_entries;
+
+  /* Compute colormap size and total file size */
+  if (cinfo->out_color_space == JCS_RGB) {
+    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 {
+    /* 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 + (INT32) dest->row_width * (INT32) cinfo->output_height;
+  
+  /* Set unused fields of header to 0 */
+  MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
+  MEMZERO(bmpcoreheader, 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 (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
+    ERREXIT(cinfo, JERR_FILE_WRITE);
+  if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (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(GETJSAMPLE(colormap[2][i]), outfile);
+	putc(GETJSAMPLE(colormap[1][i]), outfile);
+	putc(GETJSAMPLE(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(GETJSAMPLE(colormap[0][i]), outfile);
+	putc(GETJSAMPLE(colormap[0][i]), outfile);
+	putc(GETJSAMPLE(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);
+  }
+}
+
+
+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;
+  register JDIMENSION col;
+  cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
+
+  /* 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];
+    for (col = dest->row_width; col > 0; col--) {
+      putc(GETJSAMPLE(*data_ptr), outfile);
+      data_ptr++;
+    }
+  }
+  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)
+{
+  bmp_dest_ptr dest;
+  JDIMENSION row_width;
+
+  /* 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->is_os2 = is_os2;
+
+  if (cinfo->out_color_space == JCS_GRAYSCALE) {
+    dest->pub.put_pixel_rows = put_gray_rows;
+  } else if (cinfo->out_color_space == JCS_RGB) {
+    if (cinfo->quantize_colors)
+      dest->pub.put_pixel_rows = put_gray_rows;
+    else
+      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). */
+  row_width = cinfo->output_width * cinfo->output_components;
+  dest->data_width = row_width;
+  while ((row_width & 3) != 0) row_width++;
+  dest->row_width = row_width;
+  dest->pad_bytes = (int) (row_width - dest->data_width);
+
+  /* Allocate space for inversion array, prepare for write pass */
+  dest->whole_image = (*cinfo->mem->request_virt_sarray)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
+     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 */
+  }
+
+  /* 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 */