ref: 65885f2808d815a4ce41d4712c19dc1dac61b6ab
dir: /jbig2_image_png.c/
/* jbig2dec Copyright (c) 2002 artofcode LLC. This software is distributed under license and may not be copied, modified or distributed except as expressly authorized under the terms of the license contained in the file LICENSE in this distribution. For information on commercial licensing, go to http://www.artifex.com/licensing/ or contact Artifex Software, Inc., 101 Lucas Valley Road #110, San Rafael, CA 94903, U.S.A., +1(415)492-9861. $Id: jbig2_image_png.c,v 1.9 2002/08/07 12:50:33 giles Exp $ */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "os_types.h" #include <stdio.h> #include <stdlib.h> #include <png.h> #include "jbig2.h" #include "jbig2_priv.h" #include "jbig2_image.h" /* take an image structure and write it out in png format */ static void jbig2_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; check = fwrite(data, 1, length, (png_FILE_p)png_ptr->io_ptr); if (check != length) { png_error(png_ptr, "Write Error"); } } static void jbig2_png_flush(png_structp png_ptr) { png_FILE_p io_ptr; io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); if (io_ptr != NULL) fflush(io_ptr); } int jbig2_image_write_png_file(Jbig2Image *image, char *filename) { FILE *out; int error; if ((out = fopen(filename, "wb")) == NULL) { fprintf(stderr, "unable to open '%s' for writing\n", filename); return 1; } error = jbig2_image_write_png(image, out); fclose(out); return (error); } /* write out an image struct in png format to an open file pointer */ int jbig2_image_write_png(Jbig2Image *image, FILE *out) { int i; png_structp png; png_infop info; png_bytep rowpointer; png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); if (png == NULL) { fprintf(stderr, "unable to create png structure\n"); return 2; } info = png_create_info_struct(png); if (info == NULL) { fprintf(stderr, "unable to create png info structure\n"); png_destroy_write_struct(&png, (png_infopp)NULL); return 3; } /* set/check error handling */ if (setjmp(png_jmpbuf(png))) { /* we've returned here after an internal error */ fprintf(stderr, "internal error in libpng saving file\n"); png_destroy_write_struct(&png, &info); return 4; } /* png_init_io() doesn't work linking dynamically to libpng on win32 one has to either link statically or use callbacks because of runtime variations */ /* png_init_io(png, out); */ png_set_write_fn(png, (png_voidp)out, jbig2_png_write_data, jbig2_png_flush); /* now we fill out the info structure with our format data */ png_set_IHDR(png, info, image->width, image->height, 1, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); png_write_info(png, info); /* png natively treates 0 as black. This will convert for us */ png_set_invert_mono(png); /* write out each row in turn */ rowpointer = (png_bytep)image->data; for(i = 0; i < image->height; i++) { png_write_row(png, rowpointer); rowpointer += image->stride; } /* finish and clean up */ png_write_end(png, info); png_destroy_write_struct(&png, &info); return 0; }