+++ /dev/null
-/*
- * 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 */
projects / synfig.git / blobdiff