ref: 5d215388772fd0c2931cdc4cafca74c1256bfea6
dir: /png_image.c/
/* jbig2dec Copyright (c) 2001 artofcode LLC. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. $Id: png_image.c,v 1.3 2001/08/13 20:31:59 giles Exp $ */ #include <stdio.h> #include <stdlib.h> #include <png.h> #include "jbig2dec.h" #include "jbig2_image.h" /* take and image structure and write it out in png format */ int jbig2_image_write_png(Jbig2Image *image, char *filename) { FILE *out; int i; png_structp png; png_infop info; png_bytep rowpointer; if ((out = fopen(filename, "wb")) == NULL) { fprintf(stderr, "unable to open '%s' for writing\n", filename); return 1; } png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); if (png == NULL) { fprintf(stderr, "unable to create png structure\n"); fclose(out); return 2; } info = png_create_info_struct(png); if (info == NULL) { fprintf(stderr, "unable to create png info structure\n"); fclose(out); 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"); fclose(out); png_destroy_write_struct(&png, &info); return 4; } png_init_io(png, out); /* 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); fclose(out); return 0; } #ifdef TEST int main(int argc, char *argv[]) { int i,j; Jbig2Image *image; uint32 *data; char *filename = "test.png"; image = jbig2_image_new(400,400); if (image == NULL) { fprintf(stderr, "failed to create jbig2 image structure!\n"); exit(1); } fprintf(stderr, "creating checkerboard test image '%s'\n", filename); data = image->data; for (j = 0; j < image->height; j++) { for (i = 0; i < image->stride >> 2; i++) { *data++ = ((j & 16) >> 4) ? 0x0000FFFF: 0xFFFF0000; } } return jbig2_image_write_png(image, filename); } #endif /* TEST */