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mypng.c
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mypng.c
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#include "png.h"
#include <stdlib.h>
#include <stdint.h>
#include <time.h>
struct measure
{
double flops;
float estimation;
};
//int width, height;
png_uint_32 width;
png_uint_32 height;
float **tofloatArray(png_byte **orig)
{
float **dest = (float **)malloc(sizeof(float **) * height);
for (int i = 0; i < height; i++)
{
dest[i] = (float *)malloc(sizeof(float *) * width);
for (int j = 0; j < width; j++)
dest[i][j] = orig[i][j]; //ok
}
return dest;
}
png_byte **topngArray(float **orig)
{
png_byte **dest = (png_byte **)malloc(sizeof(png_byte **) * height);
for (int i = 0; i < height; i++)
{
dest[i] = (png_byte *)malloc(sizeof(png_byte *) * width);
for (int j = 0; j < width; j++)
dest[i][j] = orig[i][j]; //ok
}
return dest;
}
/*
* read the png file
* return: a pointing reference to png's Vector
*/
png_byte **readpng(const char *filepath)
{
FILE *fp = fopen(filepath, "rb");
int bit_depth;
int color_type;
int interlace_method;
int compression_method;
int filter_method;
png_structp png_ptr;
png_infop info_ptr;
fp = fopen(filepath, "rb");
if (!fp)
{
abort();
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
abort();
info_ptr = png_create_info_struct(png_ptr);
if (!png_ptr)
abort();
png_init_io(png_ptr, fp);
png_read_info(png_ptr, info_ptr);
width = png_get_image_width(png_ptr, info_ptr);
height = png_get_image_height(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
png_read_update_info(png_ptr, info_ptr);
png_byte **row_pointers = (png_byte **)malloc(sizeof(png_bytep **) * height);
for (int y = 0; y < height; y++)
{
row_pointers[y] = (png_byte *)malloc(png_get_rowbytes(png_ptr, info_ptr));
}
png_read_image(png_ptr, row_pointers);
free(info_ptr);
free(png_ptr);
fclose(fp);
return row_pointers;
}
/*
*release the occupied memory by pointer
*/
void cleanpngbytes(png_byte **rowsx)
{
for (int y = 0; y < height; y++)
{
free(rowsx[y]);
}
free(rowsx);
}
/*
*release the occupied memory by pointer
*/
void cleanfloats(float **rowsx)
{
for (int y = 0; y < height; y++)
{
free(rowsx[y]);
}
free(rowsx);
}
float **fillfloats()
{
float **row_pointers = malloc(height * sizeof(float **));
size_t w, h;
for (h = 0; h < height; h++)
{
row_pointers[h] = malloc(sizeof(float *) * width);
for (w = 0; w < width; w++)
{
row_pointers[h][w] = 0;
}
}
return row_pointers;
}
float sum = 0;
struct measure stencilfilterapply(float **read_rows, float **write_rows)
{
size_t w, h;
long a = 1;
float **row_pointers = write_rows;
clock_t start = clock();
for (h = 1; h < height - 1; h++)
{
for (w = 1; w < width - 1; w++)
{
sum =
(-1 * read_rows[h - 1][w - 1]) + (-1 * read_rows[h - 1][w]) + (-1 * read_rows[h - 1][w + 1]) +
(-1 * read_rows[h][w - 1]) + (8 * read_rows[h][w]) + (-1 * read_rows[h][w + 1]) +
(-1 * read_rows[h + 1][w - 1]) + (-1 * read_rows[h + 1][w]) + (-1 * read_rows[h + 1][w + 1]);
if (sum < 0)
sum = 0;
else if (sum > 255)
sum = 255;
write_rows[h][w] = sum;
}
}
clock_t end = clock();
double elapsed = ((double)(end - start) / CLOCKS_PER_SEC);
struct measure curr_measure;
curr_measure.flops = (((height - 2) * (width - 2) * 18) / (elapsed) / 1000000000);
curr_measure.estimation = elapsed * 1000;
return curr_measure;
}
/*
* write png
*/
void writepng(const char *filename, float **write_rows)
{
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
int depth = 8;
fp = fopen(filename, "wb");
if (!fp)
abort();
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL)
abort();
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
abort();
if (setjmp(png_jmpbuf(png_ptr)))
abort();
png_set_IHDR(png_ptr,
info_ptr,
width,
height,
depth,
PNG_COLOR_TYPE_GRAY,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_byte **f = topngArray(write_rows);
png_init_io(png_ptr, fp);
png_set_rows(png_ptr, info_ptr, f);
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
//cleaning up
for (int y = 0; y < height; y++)
png_free(png_ptr, f[y]);
png_free(png_ptr, f);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
}