443 lines
14 KiB
C
443 lines
14 KiB
C
/*
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* wrbmp.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains routines to write output images in Microsoft "BMP"
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* format (MS Windows 3.x and OS/2 1.x flavors).
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* Either 8-bit colormapped or 24-bit full-color format can be written.
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* No compression is supported.
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*
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* These routines may need modification for non-Unix environments or
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* specialized applications. As they stand, they assume output to
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* an ordinary stdio stream.
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*
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* This code contributed by James Arthur Boucher.
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#ifdef BMP_SUPPORTED
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/*
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* To support 12-bit JPEG data, we'd have to scale output down to 8 bits.
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* This is not yet implemented.
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*/
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#if BITS_IN_JSAMPLE != 8
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Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
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#endif
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/*
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* Since BMP stores scanlines bottom-to-top, we have to invert the image
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* from JPEG's top-to-bottom order. To do this, we save the outgoing data
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* in a virtual array during put_pixel_row calls, then actually emit the
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* BMP file during finish_output. The virtual array contains one JSAMPLE per
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* pixel if the output is grayscale or colormapped, three if it is full color.
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*/
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/* Private version of data destination object */
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typedef struct {
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struct djpeg_dest_struct pub; /* public fields */
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boolean is_os2; /* saves the OS2 format request flag */
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jvirt_sarray_ptr whole_image; /* needed to reverse row order */
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JDIMENSION data_width; /* JSAMPLEs per row */
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JDIMENSION row_width; /* physical width of one row in the BMP file */
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int pad_bytes; /* number of padding bytes needed per row */
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JDIMENSION cur_output_row; /* next row# to write to virtual array */
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} bmp_dest_struct;
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typedef bmp_dest_struct * bmp_dest_ptr;
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/* Forward declarations */
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LOCAL(void) write_colormap
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JPP((j_decompress_ptr cinfo, bmp_dest_ptr dest,
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int map_colors, int map_entry_size));
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/*
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* Write some pixel data.
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* In this module rows_supplied will always be 1.
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*/
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METHODDEF(void)
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put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
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JDIMENSION rows_supplied)
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/* This version is for writing 24-bit pixels */
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{
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bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
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JSAMPARRAY image_ptr;
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register JSAMPROW inptr, outptr;
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register JDIMENSION col;
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int pad;
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/* Access next row in virtual array */
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, dest->whole_image,
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dest->cur_output_row, (JDIMENSION) 1, TRUE);
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dest->cur_output_row++;
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/* Transfer data. Note destination values must be in BGR order
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* (even though Microsoft's own documents say the opposite).
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*/
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inptr = dest->pub.buffer[0];
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outptr = image_ptr[0];
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for (col = cinfo->output_width; col > 0; col--) {
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outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[1] = *inptr++;
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outptr[0] = *inptr++;
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outptr += 3;
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}
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/* Zero out the pad bytes. */
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pad = dest->pad_bytes;
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while (--pad >= 0)
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*outptr++ = 0;
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}
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METHODDEF(void)
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put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
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JDIMENSION rows_supplied)
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/* This version is for grayscale OR quantized color output */
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{
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bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
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JSAMPARRAY image_ptr;
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register JSAMPROW inptr, outptr;
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register JDIMENSION col;
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int pad;
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/* Access next row in virtual array */
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, dest->whole_image,
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dest->cur_output_row, (JDIMENSION) 1, TRUE);
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dest->cur_output_row++;
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/* Transfer data. */
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inptr = dest->pub.buffer[0];
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outptr = image_ptr[0];
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for (col = cinfo->output_width; col > 0; col--) {
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*outptr++ = *inptr++; /* can omit GETJSAMPLE() safely */
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}
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/* Zero out the pad bytes. */
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pad = dest->pad_bytes;
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while (--pad >= 0)
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*outptr++ = 0;
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}
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/*
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* Startup: normally writes the file header.
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* In this module we may as well postpone everything until finish_output.
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*/
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METHODDEF(void)
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start_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
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{
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/* no work here */
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}
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/*
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* Finish up at the end of the file.
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*
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* Here is where we really output the BMP file.
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*
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* First, routines to write the Windows and OS/2 variants of the file header.
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*/
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LOCAL(void)
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write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest)
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/* Write a Windows-style BMP file header, including colormap if needed */
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{
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char bmpfileheader[14];
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char bmpinfoheader[40];
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#define PUT_2B(array,offset,value) \
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(array[offset] = (char) ((value) & 0xFF), \
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array[offset+1] = (char) (((value) >> 8) & 0xFF))
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#define PUT_4B(array,offset,value) \
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(array[offset] = (char) ((value) & 0xFF), \
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array[offset+1] = (char) (((value) >> 8) & 0xFF), \
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array[offset+2] = (char) (((value) >> 16) & 0xFF), \
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array[offset+3] = (char) (((value) >> 24) & 0xFF))
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INT32 headersize, bfSize;
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int bits_per_pixel, cmap_entries;
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/* Compute colormap size and total file size */
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if (cinfo->out_color_space == JCS_RGB) {
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if (cinfo->quantize_colors) {
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/* Colormapped RGB */
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bits_per_pixel = 8;
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cmap_entries = 256;
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} else {
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/* Unquantized, full color RGB */
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bits_per_pixel = 24;
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cmap_entries = 0;
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}
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} else {
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/* Grayscale output. We need to fake a 256-entry colormap. */
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bits_per_pixel = 8;
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cmap_entries = 256;
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}
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/* File size */
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headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */
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bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height;
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/* Set unused fields of header to 0 */
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MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
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MEMZERO(bmpinfoheader, SIZEOF(bmpinfoheader));
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/* Fill the file header */
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bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */
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bmpfileheader[1] = 0x4D;
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PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */
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/* we leave bfReserved1 & bfReserved2 = 0 */
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PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */
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/* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */
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PUT_2B(bmpinfoheader, 0, 40); /* biSize */
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PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */
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PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */
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PUT_2B(bmpinfoheader, 12, 1); /* biPlanes - must be 1 */
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PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */
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/* we leave biCompression = 0, for none */
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/* we leave biSizeImage = 0; this is correct for uncompressed data */
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if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */
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PUT_4B(bmpinfoheader, 24, (INT32) (cinfo->X_density*100)); /* XPels/M */
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PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); /* XPels/M */
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}
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PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */
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/* we leave biClrImportant = 0 */
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if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
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ERREXIT(cinfo, JERR_FILE_WRITE);
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if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40)
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ERREXIT(cinfo, JERR_FILE_WRITE);
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if (cmap_entries > 0)
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write_colormap(cinfo, dest, cmap_entries, 4);
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}
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LOCAL(void)
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write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest)
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/* Write an OS2-style BMP file header, including colormap if needed */
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{
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char bmpfileheader[14];
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char bmpcoreheader[12];
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INT32 headersize, bfSize;
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int bits_per_pixel, cmap_entries;
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/* Compute colormap size and total file size */
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if (cinfo->out_color_space == JCS_RGB) {
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if (cinfo->quantize_colors) {
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/* Colormapped RGB */
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bits_per_pixel = 8;
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cmap_entries = 256;
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} else {
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/* Unquantized, full color RGB */
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bits_per_pixel = 24;
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cmap_entries = 0;
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}
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} else {
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/* Grayscale output. We need to fake a 256-entry colormap. */
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bits_per_pixel = 8;
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cmap_entries = 256;
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}
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/* File size */
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headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */
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bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height;
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/* Set unused fields of header to 0 */
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MEMZERO(bmpfileheader, SIZEOF(bmpfileheader));
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MEMZERO(bmpcoreheader, SIZEOF(bmpcoreheader));
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/* Fill the file header */
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bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */
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bmpfileheader[1] = 0x4D;
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PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */
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/* we leave bfReserved1 & bfReserved2 = 0 */
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PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */
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/* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */
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PUT_2B(bmpcoreheader, 0, 12); /* bcSize */
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PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */
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PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */
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PUT_2B(bmpcoreheader, 8, 1); /* bcPlanes - must be 1 */
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PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */
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if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14)
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ERREXIT(cinfo, JERR_FILE_WRITE);
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if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12)
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ERREXIT(cinfo, JERR_FILE_WRITE);
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if (cmap_entries > 0)
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write_colormap(cinfo, dest, cmap_entries, 3);
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}
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/*
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* Write the colormap.
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* Windows uses BGR0 map entries; OS/2 uses BGR entries.
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*/
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LOCAL(void)
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write_colormap (j_decompress_ptr cinfo, bmp_dest_ptr dest,
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int map_colors, int map_entry_size)
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{
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JSAMPARRAY colormap = cinfo->colormap;
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int num_colors = cinfo->actual_number_of_colors;
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FILE * outfile = dest->pub.output_file;
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int i;
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if (colormap != NULL) {
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if (cinfo->out_color_components == 3) {
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/* Normal case with RGB colormap */
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for (i = 0; i < num_colors; i++) {
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putc(GETJSAMPLE(colormap[2][i]), outfile);
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putc(GETJSAMPLE(colormap[1][i]), outfile);
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putc(GETJSAMPLE(colormap[0][i]), outfile);
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if (map_entry_size == 4)
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putc(0, outfile);
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}
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} else {
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/* Grayscale colormap (only happens with grayscale quantization) */
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for (i = 0; i < num_colors; i++) {
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putc(GETJSAMPLE(colormap[0][i]), outfile);
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putc(GETJSAMPLE(colormap[0][i]), outfile);
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putc(GETJSAMPLE(colormap[0][i]), outfile);
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if (map_entry_size == 4)
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putc(0, outfile);
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}
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}
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} else {
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/* If no colormap, must be grayscale data. Generate a linear "map". */
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for (i = 0; i < 256; i++) {
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putc(i, outfile);
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putc(i, outfile);
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putc(i, outfile);
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if (map_entry_size == 4)
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putc(0, outfile);
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}
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}
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/* Pad colormap with zeros to ensure specified number of colormap entries */
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if (i > map_colors)
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ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, i);
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for (; i < map_colors; i++) {
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putc(0, outfile);
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putc(0, outfile);
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putc(0, outfile);
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if (map_entry_size == 4)
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putc(0, outfile);
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}
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}
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METHODDEF(void)
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finish_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
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{
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bmp_dest_ptr dest = (bmp_dest_ptr) dinfo;
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register FILE * outfile = dest->pub.output_file;
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JSAMPARRAY image_ptr;
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register JSAMPROW data_ptr;
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JDIMENSION row;
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register JDIMENSION col;
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cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
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/* Write the header and colormap */
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if (dest->is_os2)
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write_os2_header(cinfo, dest);
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else
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write_bmp_header(cinfo, dest);
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/* Write the file body from our virtual array */
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for (row = cinfo->output_height; row > 0; row--) {
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if (progress != NULL) {
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progress->pub.pass_counter = (long) (cinfo->output_height - row);
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progress->pub.pass_limit = (long) cinfo->output_height;
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(*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
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}
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, dest->whole_image, row-1, (JDIMENSION) 1, FALSE);
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data_ptr = image_ptr[0];
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for (col = dest->row_width; col > 0; col--) {
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putc(GETJSAMPLE(*data_ptr), outfile);
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data_ptr++;
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}
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}
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if (progress != NULL)
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progress->completed_extra_passes++;
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/* Make sure we wrote the output file OK */
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fflush(outfile);
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if (ferror(outfile))
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ERREXIT(cinfo, JERR_FILE_WRITE);
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}
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/*
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* The module selection routine for BMP format output.
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*/
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GLOBAL(djpeg_dest_ptr)
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jinit_write_bmp (j_decompress_ptr cinfo, boolean is_os2)
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{
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bmp_dest_ptr dest;
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JDIMENSION row_width;
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/* Create module interface object, fill in method pointers */
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dest = (bmp_dest_ptr)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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SIZEOF(bmp_dest_struct));
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dest->pub.start_output = start_output_bmp;
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dest->pub.finish_output = finish_output_bmp;
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dest->is_os2 = is_os2;
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if (cinfo->out_color_space == JCS_GRAYSCALE) {
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dest->pub.put_pixel_rows = put_gray_rows;
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} else if (cinfo->out_color_space == JCS_RGB) {
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if (cinfo->quantize_colors)
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dest->pub.put_pixel_rows = put_gray_rows;
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else
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dest->pub.put_pixel_rows = put_pixel_rows;
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} else {
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ERREXIT(cinfo, JERR_BMP_COLORSPACE);
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}
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/* Calculate output image dimensions so we can allocate space */
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jpeg_calc_output_dimensions(cinfo);
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/* Determine width of rows in the BMP file (padded to 4-byte boundary). */
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row_width = cinfo->output_width * cinfo->output_components;
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dest->data_width = row_width;
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while ((row_width & 3) != 0) row_width++;
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dest->row_width = row_width;
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dest->pad_bytes = (int) (row_width - dest->data_width);
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/* Allocate space for inversion array, prepare for write pass */
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dest->whole_image = (*cinfo->mem->request_virt_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
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row_width, cinfo->output_height, (JDIMENSION) 1);
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dest->cur_output_row = 0;
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if (cinfo->progress != NULL) {
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cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
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progress->total_extra_passes++; /* count file input as separate pass */
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}
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/* Create decompressor output buffer. */
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dest->pub.buffer = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE, row_width, (JDIMENSION) 1);
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dest->pub.buffer_height = 1;
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return (djpeg_dest_ptr) dest;
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}
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#endif /* BMP_SUPPORTED */
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