/* png.c - Handles output to PNG file */ /* libzint - the open source barcode library Copyright (C) 2009-2016 Robin Stuart Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #ifdef _MSC_VER #include #include #endif #include #include #include "common.h" #ifndef NO_PNG #include #include #include #define SSET "0123456789ABCDEF" struct mainprog_info_type { long width; long height; FILE *outfile; jmp_buf jmpbuf; }; static void writepng_error_handler(png_structp png_ptr, png_const_charp msg) { struct mainprog_info_type *graphic; fprintf(stderr, "writepng libpng error: %s\n", msg); fflush(stderr); graphic = (struct mainprog_info_type*) png_get_error_ptr(png_ptr); if (graphic == NULL) { /* we are completely hosed now */ fprintf(stderr, "writepng severe error: jmpbuf not recoverable; terminating.\n"); fflush(stderr); return; } longjmp(graphic->jmpbuf, 1); } int png_pixel_plot(struct zint_symbol *symbol, int image_height, int image_width, char *pixelbuf, int rotate_angle) { struct mainprog_info_type wpng_info; struct mainprog_info_type *graphic; png_structp png_ptr; png_infop info_ptr; unsigned char *image_data; int i, row, column, errno; int fgred, fggrn, fgblu, bgred, bggrn, bgblu; #ifndef _MSC_VER unsigned char outdata[image_width * 3]; #else unsigned char* outdata = (unsigned char*) _alloca(image_width * 3); #endif graphic = &wpng_info; switch (rotate_angle) { case 0: case 180: graphic->width = image_width; graphic->height = image_height; break; case 90: case 270: graphic->width = image_height; graphic->height = image_width; break; } /* sort out colour options */ to_upper((unsigned char*) symbol->fgcolour); to_upper((unsigned char*) symbol->bgcolour); if (strlen(symbol->fgcolour) != 6) { strcpy(symbol->errtxt, "Malformed foreground colour target"); return ZINT_ERROR_INVALID_OPTION; } if (strlen(symbol->bgcolour) != 6) { strcpy(symbol->errtxt, "Malformed background colour target"); return ZINT_ERROR_INVALID_OPTION; } errno = is_sane(SSET, (unsigned char*) symbol->fgcolour, strlen(symbol->fgcolour)); if (errno == ZINT_ERROR_INVALID_DATA) { strcpy(symbol->errtxt, "Malformed foreground colour target"); return ZINT_ERROR_INVALID_OPTION; } errno = is_sane(SSET, (unsigned char*) symbol->bgcolour, strlen(symbol->bgcolour)); if (errno == ZINT_ERROR_INVALID_DATA) { strcpy(symbol->errtxt, "Malformed background colour target"); return ZINT_ERROR_INVALID_OPTION; } fgred = (16 * ctoi(symbol->fgcolour[0])) + ctoi(symbol->fgcolour[1]); fggrn = (16 * ctoi(symbol->fgcolour[2])) + ctoi(symbol->fgcolour[3]); fgblu = (16 * ctoi(symbol->fgcolour[4])) + ctoi(symbol->fgcolour[5]); bgred = (16 * ctoi(symbol->bgcolour[0])) + ctoi(symbol->bgcolour[1]); bggrn = (16 * ctoi(symbol->bgcolour[2])) + ctoi(symbol->bgcolour[3]); bgblu = (16 * ctoi(symbol->bgcolour[4])) + ctoi(symbol->bgcolour[5]); /* Open output file in binary mode */ if (symbol->output_options & BARCODE_STDOUT) { #ifdef _MSC_VER if (-1 == _setmode(_fileno(stdout), _O_BINARY)) { strcpy(symbol->errtxt, "Can't open output file"); return ZINT_ERROR_FILE_ACCESS; } #endif graphic->outfile = stdout; } else { if (!(graphic->outfile = fopen(symbol->outfile, "wb"))) { strcpy(symbol->errtxt, "Can't open output file"); return ZINT_ERROR_FILE_ACCESS; } } /* Set up error handling routine as proc() above */ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, graphic, writepng_error_handler, NULL); if (!png_ptr) { strcpy(symbol->errtxt, "Out of memory"); return ZINT_ERROR_MEMORY; } info_ptr = png_create_info_struct(png_ptr); if (!info_ptr) { png_destroy_write_struct(&png_ptr, NULL); strcpy(symbol->errtxt, "Out of memory"); return ZINT_ERROR_MEMORY; } /* catch jumping here */ if (setjmp(graphic->jmpbuf)) { png_destroy_write_struct(&png_ptr, &info_ptr); strcpy(symbol->errtxt, "libpng error occurred"); return ZINT_ERROR_MEMORY; } /* open output file with libpng */ png_init_io(png_ptr, graphic->outfile); /* set compression */ png_set_compression_level(png_ptr, 9); /* set Header block */ png_set_IHDR(png_ptr, info_ptr, graphic->width, graphic->height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); /* write all chunks up to (but not including) first IDAT */ png_write_info(png_ptr, info_ptr); /* set up the transformations: for now, just pack low-bit-depth pixels into bytes (one, two or four pixels per byte) */ png_set_packing(png_ptr); /* Pixel Plotting */ switch (rotate_angle) { case 0: /* Plot the right way up */ for (row = 0; row < image_height; row++) { for (column = 0; column < image_width; column++) { i = column * 3; switch (*(pixelbuf + (image_width * row) + column)) { case '1': outdata[i] = fgred; outdata[i + 1] = fggrn; outdata[i + 2] = fgblu; break; default: outdata[i] = bgred; outdata[i + 1] = bggrn; outdata[i + 2] = bgblu; break; } } /* write row contents to file */ image_data = outdata; png_write_row(png_ptr, image_data); } break; case 90: /* Plot 90 degrees clockwise */ for (row = 0; row < image_width; row++) { for (column = 0; column < image_height; column++) { i = column * 3; switch (*(pixelbuf + (image_width * (image_height - column - 1)) + row)) { case '1': outdata[i] = fgred; outdata[i + 1] = fggrn; outdata[i + 2] = fgblu; break; default: outdata[i] = bgred; outdata[i + 1] = bggrn; outdata[i + 2] = bgblu; break; } } /* write row contents to file */ image_data = outdata; png_write_row(png_ptr, image_data); } break; case 180: /* Plot upside down */ for (row = 0; row < image_height; row++) { for (column = 0; column < image_width; column++) { i = column * 3; switch (*(pixelbuf + (image_width * (image_height - row - 1)) + (image_width - column - 1))) { case '1': outdata[i] = fgred; outdata[i + 1] = fggrn; outdata[i + 2] = fgblu; break; default: outdata[i] = bgred; outdata[i + 1] = bggrn; outdata[i + 2] = bgblu; break; } } /* write row contents to file */ image_data = outdata; png_write_row(png_ptr, image_data); } break; case 270: /* Plot 90 degrees anti-clockwise */ for (row = 0; row < image_width; row++) { for (column = 0; column < image_height; column++) { i = column * 3; switch (*(pixelbuf + (image_width * column) + (image_width - row - 1))) { case '1': outdata[i] = fgred; outdata[i + 1] = fggrn; outdata[i + 2] = fgblu; break; default: outdata[i] = bgred; outdata[i + 1] = bggrn; outdata[i + 2] = bgblu; break; } } /* write row contents to file */ image_data = outdata; png_write_row(png_ptr, image_data); } break; } /* End the file */ png_write_end(png_ptr, NULL); /* make sure we have disengaged */ if (png_ptr && info_ptr) png_destroy_write_struct(&png_ptr, &info_ptr); if (symbol->output_options & BARCODE_STDOUT) { fflush(wpng_info.outfile); } else { fclose(wpng_info.outfile); } return 0; } #endif /* NO_PNG */