1 /* readpng.c 2 * 3 * Copyright (c) 2013 John Cunningham Bowler 4 * 5 * Last changed in libpng 1.6.1 [March 28, 2013] 6 * 7 * This code is released under the libpng license. 8 * For conditions of distribution and use, see the disclaimer 9 * and license in png.h 10 * 11 * Load an arbitrary number of PNG files (from the command line, or, if there 12 * are no arguments on the command line, from stdin) then run a time test by 13 * reading each file by row. The test does nothing with the read result and 14 * does no transforms. The only output is a time as a floating point number of 15 * seconds with 9 decimal digits. 16 */ 17 #include <stdlib.h> 18 #include <stdio.h> 19 #include <string.h> 20 21 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 22 # include <config.h> 23 #endif 24 25 /* Define the following to use this test against your installed libpng, rather 26 * than the one being built here: 27 */ 28 #ifdef PNG_FREESTANDING_TESTS 29 # include <png.h> 30 #else 31 # include "../../png.h" 32 #endif 33 34 static int 35 read_png(FILE *fp) 36 { 37 png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0); 38 png_infop info_ptr = NULL; 39 png_bytep row = NULL, display = NULL; 40 41 if (png_ptr == NULL) 42 return 0; 43 44 if (setjmp(png_jmpbuf(png_ptr))) 45 { 46 png_destroy_read_struct(&png_ptr, &info_ptr, NULL); 47 if (row != NULL) free(row); 48 if (display != NULL) free(display); 49 return 0; 50 } 51 52 png_init_io(png_ptr, fp); 53 54 info_ptr = png_create_info_struct(png_ptr); 55 if (info_ptr == NULL) 56 png_error(png_ptr, "OOM allocating info structure"); 57 58 png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0); 59 60 png_read_info(png_ptr, info_ptr); 61 62 { 63 png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); 64 65 /* Failure to initialize these is harmless */ 66 row = malloc(rowbytes); 67 display = malloc(rowbytes); 68 69 if (row == NULL || display == NULL) 70 png_error(png_ptr, "OOM allocating row buffers"); 71 72 { 73 png_uint_32 height = png_get_image_height(png_ptr, info_ptr); 74 # ifdef PNG_READ_INTERLACING_SUPPORTED 75 int passes = png_set_interlace_handling(png_ptr); 76 # else /* !READ_INTERLACING */ 77 int passes = png_get_interlace_type(png_ptr, info_ptr) == 78 PNG_INTERLACE_ADAM7 ? PNG_INTERLACE_ADAM7_PASSES : 1; 79 # endif /* !READ_INTERLACING */ 80 int pass; 81 82 png_start_read_image(png_ptr); 83 84 for (pass = 0; pass < passes; ++pass) 85 { 86 png_uint_32 y = height; 87 88 # ifndef PNG_READ_INTERLACING_SUPPORTED 89 if (passes == PNG_INTERLACE_ADAM7_PASSES) 90 y = PNG_PASS_ROWS(y, pass); 91 # endif /* READ_INTERLACING */ 92 93 /* NOTE: this trashes the row each time; interlace handling won't 94 * work, but this avoids memory thrashing for speed testing. 95 */ 96 while (y-- > 0) 97 png_read_row(png_ptr, row, display); 98 } 99 } 100 } 101 102 /* Make sure to read to the end of the file: */ 103 png_read_end(png_ptr, info_ptr); 104 png_destroy_read_struct(&png_ptr, &info_ptr, NULL); 105 free(row); 106 free(display); 107 return 1; 108 } 109 110 int 111 main(void) 112 { 113 /* Exit code 0 on success. */ 114 return !read_png(stdin); 115 } 116