mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
d7d950e8bd
The leading blank lines are apparently an artefact of an older source control system. They are not required and they look like accidents, because starting a source file with a blank line is not a regular habit of software developers nowadays. This is a cherry-pick of commit 37cc20add8fb5b83bb5299a26cd3b41e0f776017 from branch 'libpng18'. Signed-off-by: John Bowler <jbowler@acm.org> Signed-off-by: Cosmin Truta <ctruta@gmail.com>
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/* readpng.c
|
|
*
|
|
* Copyright (c) 2013 John Cunningham Bowler
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*
|
|
* Load an arbitrary number of PNG files (from the command line, or, if there
|
|
* are no arguments on the command line, from stdin) then run a time test by
|
|
* reading each file by row. The test does nothing with the read result and
|
|
* does no transforms. The only output is a time as a floating point number of
|
|
* seconds with 9 decimal digits.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
|
|
# include <config.h>
|
|
#endif
|
|
|
|
/* Define the following to use this test against your installed libpng, rather
|
|
* than the one being built here:
|
|
*/
|
|
#ifdef PNG_FREESTANDING_TESTS
|
|
# include <png.h>
|
|
#else
|
|
# include "../../png.h"
|
|
#endif
|
|
|
|
static int
|
|
read_png(FILE *fp)
|
|
{
|
|
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
|
|
png_infop info_ptr = NULL;
|
|
png_bytep row = NULL, display = NULL;
|
|
|
|
if (png_ptr == NULL)
|
|
return 0;
|
|
|
|
if (setjmp(png_jmpbuf(png_ptr)))
|
|
{
|
|
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
|
|
if (row != NULL) free(row);
|
|
if (display != NULL) free(display);
|
|
return 0;
|
|
}
|
|
|
|
png_init_io(png_ptr, fp);
|
|
|
|
info_ptr = png_create_info_struct(png_ptr);
|
|
if (info_ptr == NULL)
|
|
png_error(png_ptr, "OOM allocating info structure");
|
|
|
|
png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0);
|
|
|
|
png_read_info(png_ptr, info_ptr);
|
|
|
|
{
|
|
size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
|
|
|
|
/* Failure to initialize these is harmless */
|
|
row = malloc(rowbytes);
|
|
display = malloc(rowbytes);
|
|
|
|
if (row == NULL || display == NULL)
|
|
png_error(png_ptr, "OOM allocating row buffers");
|
|
|
|
{
|
|
png_uint_32 height = png_get_image_height(png_ptr, info_ptr);
|
|
# ifdef PNG_READ_INTERLACING_SUPPORTED
|
|
int passes = png_set_interlace_handling(png_ptr);
|
|
# else /* !READ_INTERLACING */
|
|
int passes = png_get_interlace_type(png_ptr, info_ptr) ==
|
|
PNG_INTERLACE_ADAM7 ? PNG_INTERLACE_ADAM7_PASSES : 1;
|
|
# endif /* !READ_INTERLACING */
|
|
int pass;
|
|
|
|
png_start_read_image(png_ptr);
|
|
|
|
for (pass = 0; pass < passes; ++pass)
|
|
{
|
|
png_uint_32 y = height;
|
|
|
|
# ifndef PNG_READ_INTERLACING_SUPPORTED
|
|
if (passes == PNG_INTERLACE_ADAM7_PASSES)
|
|
y = PNG_PASS_ROWS(y, pass);
|
|
# endif /* READ_INTERLACING */
|
|
|
|
/* NOTE: this trashes the row each time; interlace handling won't
|
|
* work, but this avoids memory thrashing for speed testing.
|
|
*/
|
|
while (y-- > 0)
|
|
png_read_row(png_ptr, row, display);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Make sure to read to the end of the file: */
|
|
png_read_end(png_ptr, info_ptr);
|
|
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
|
|
free(row);
|
|
free(display);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
/* Exit code 0 on success. */
|
|
return !read_png(stdin);
|
|
}
|