/* rgr.c (raster graphics) */ /*********************************************************************** * This code is part of GLPK (GNU Linear Programming Kit). * Copyright (C) 2004-2018 Free Software Foundation, Inc. * Written by Andrew Makhorin . * * GLPK 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 3 of the License, or * (at your option) any later version. * * GLPK is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * You should have received a copy of the GNU General Public License * along with GLPK. If not, see . ***********************************************************************/ #include "env.h" #include "rgr.h" /*********************************************************************** * NAME * * rgr_write_bmp16 - write 16-color raster image in BMP file format * * SYNOPSIS * * #include "rgr.h" * int rgr_write_bmp16(const char *fname, int m, int n, const char * map[]); * * DESCRIPTION * * The routine rgr_write_bmp16 writes 16-color raster image in * uncompressed BMP file format (Windows bitmap) to a binary file whose * name is specified by the character string fname. * * The parameters m and n specify, respectively, the number of rows and * the numbers of columns (i.e. height and width) of the raster image. * * The character array map has m*n elements. Elements map[0, ..., n-1] * correspond to the first (top) scanline, elements map[n, ..., 2*n-1] * correspond to the second scanline, etc. * * Each element of the array map specifies a color of the corresponding * pixel as 8-bit binary number XXXXIRGB, where four high-order bits (X) * are ignored, I is high intensity bit, R is red color bit, G is green * color bit, and B is blue color bit. Thus, all 16 possible colors are * coded as following hexadecimal numbers: * * 0x00 = black 0x08 = dark gray * 0x01 = blue 0x09 = bright blue * 0x02 = green 0x0A = bright green * 0x03 = cyan 0x0B = bright cyan * 0x04 = red 0x0C = bright red * 0x05 = magenta 0x0D = bright magenta * 0x06 = brown 0x0E = yellow * 0x07 = light gray 0x0F = white * * RETURNS * * If no error occured, the routine returns zero; otherwise, it prints * an appropriate error message and returns non-zero. */ static void put_byte(FILE *fp, int c) { fputc(c, fp); return; } static void put_word(FILE *fp, int w) { /* big endian */ put_byte(fp, w); put_byte(fp, w >> 8); return; } static void put_dword(FILE *fp, int d) { /* big endian */ put_word(fp, d); put_word(fp, d >> 16); return; } int rgr_write_bmp16(const char *fname, int m, int n, const char map[]) { FILE *fp; int offset, bmsize, i, j, b, ret = 0; if (!(1 <= m && m <= 32767)) xerror("rgr_write_bmp16: m = %d; invalid height\n", m); if (!(1 <= n && n <= 32767)) xerror("rgr_write_bmp16: n = %d; invalid width\n", n); fp = fopen(fname, "wb"); if (fp == NULL) { xprintf("rgr_write_bmp16: unable to create '%s' - %s\n", #if 0 /* 29/I-2017 */ fname, strerror(errno)); #else fname, xstrerr(errno)); #endif ret = 1; goto fini; } offset = 14 + 40 + 16 * 4; bmsize = (4 * n + 31) / 32; /* struct BMPFILEHEADER (14 bytes) */ /* UINT bfType */ put_byte(fp, 'B'), put_byte(fp, 'M'); /* DWORD bfSize */ put_dword(fp, offset + bmsize * 4); /* UINT bfReserved1 */ put_word(fp, 0); /* UNIT bfReserved2 */ put_word(fp, 0); /* DWORD bfOffBits */ put_dword(fp, offset); /* struct BMPINFOHEADER (40 bytes) */ /* DWORD biSize */ put_dword(fp, 40); /* LONG biWidth */ put_dword(fp, n); /* LONG biHeight */ put_dword(fp, m); /* WORD biPlanes */ put_word(fp, 1); /* WORD biBitCount */ put_word(fp, 4); /* DWORD biCompression */ put_dword(fp, 0 /* BI_RGB */); /* DWORD biSizeImage */ put_dword(fp, 0); /* LONG biXPelsPerMeter */ put_dword(fp, 2953 /* 75 dpi */); /* LONG biYPelsPerMeter */ put_dword(fp, 2953 /* 75 dpi */); /* DWORD biClrUsed */ put_dword(fp, 0); /* DWORD biClrImportant */ put_dword(fp, 0); /* struct RGBQUAD (16 * 4 = 64 bytes) */ /* CGA-compatible colors: */ /* 0x00 = black */ put_dword(fp, 0x000000); /* 0x01 = blue */ put_dword(fp, 0x000080); /* 0x02 = green */ put_dword(fp, 0x008000); /* 0x03 = cyan */ put_dword(fp, 0x008080); /* 0x04 = red */ put_dword(fp, 0x800000); /* 0x05 = magenta */ put_dword(fp, 0x800080); /* 0x06 = brown */ put_dword(fp, 0x808000); /* 0x07 = light gray */ put_dword(fp, 0xC0C0C0); /* 0x08 = dark gray */ put_dword(fp, 0x808080); /* 0x09 = bright blue */ put_dword(fp, 0x0000FF); /* 0x0A = bright green */ put_dword(fp, 0x00FF00); /* 0x0B = bright cyan */ put_dword(fp, 0x00FFFF); /* 0x0C = bright red */ put_dword(fp, 0xFF0000); /* 0x0D = bright magenta */ put_dword(fp, 0xFF00FF); /* 0x0E = yellow */ put_dword(fp, 0xFFFF00); /* 0x0F = white */ put_dword(fp, 0xFFFFFF); /* pixel data bits */ b = 0; for (i = m - 1; i >= 0; i--) { for (j = 0; j < ((n + 7) / 8) * 8; j++) { b <<= 4; b |= (j < n ? map[i * n + j] & 15 : 0); if (j & 1) put_byte(fp, b); } } fflush(fp); if (ferror(fp)) { xprintf("rgr_write_bmp16: write error on '%s' - %s\n", #if 0 /* 29/I-2017 */ fname, strerror(errno)); #else fname, xstrerr(errno)); #endif ret = 1; } fini: if (fp != NULL) fclose(fp); return ret; } /* eof */