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104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* readpng.c
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*
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* Copyright (c) 2013 John Cunningham Bowler
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*
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* Last changed in libpng 1.6.1 [March 28, 2013]
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* Load an arbitrary number of PNG files (from the command line, or, if there
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* are no arguments on the command line, from stdin) then run a time test by
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* reading each file by row. The test does nothing with the read result and
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* does no transforms. The only output is a time as a floating point number of
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* seconds with 9 decimal digits.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
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# include <config.h>
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#endif
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/* Define the following to use this test against your installed libpng, rather
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* than the one being built here:
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*/
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#ifdef PNG_FREESTANDING_TESTS
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# include <png.h>
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#else
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# include "../../png.h"
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#endif
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static int
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read_png(FILE *fp)
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{
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
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png_infop info_ptr = NULL;
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png_bytep row = NULL, display = NULL;
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if (png_ptr == NULL)
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return 0;
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if (setjmp(png_jmpbuf(png_ptr)))
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{
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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if (row != NULL) free(row);
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if (display != NULL) free(display);
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return 0;
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}
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png_init_io(png_ptr, fp);
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info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL)
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png_error(png_ptr, "OOM allocating info structure");
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png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0);
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png_read_info(png_ptr, info_ptr);
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{
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png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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row = malloc(rowbytes);
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display = malloc(rowbytes);
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if (row == NULL || display == NULL)
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png_error(png_ptr, "OOM allocating row buffers");
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{
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png_uint_32 height = png_get_image_height(png_ptr, info_ptr);
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int passes = png_set_interlace_handling(png_ptr);
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int pass;
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png_start_read_image(png_ptr);
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for (pass = 0; pass < passes; ++pass)
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{
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png_uint_32 y = height;
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/* NOTE: this trashes the row each time; interlace handling won't
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* work, but this avoids memory thrashing for speed testing.
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*/
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while (y-- > 0)
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png_read_row(png_ptr, row, display);
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}
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}
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}
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/* Make sure to read to the end of the file: */
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png_read_end(png_ptr, info_ptr);
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png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
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free(row);
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free(display);
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return 1;
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}
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int
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main(void)
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{
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/* Exit code 0 on success. */
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return !read_png(stdin);
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}
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