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final.project.c
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final.project.c
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#include "png.h"
#include "omp.h"
#include "mm_malloc.h"
size_t width, height;
png_byte **read;
png_byte **write;
void initHeightWidth(const char *filepath)
{
FILE *fp = fopen(filepath, "rb");
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);
free(info_ptr);
free(png_ptr);
}
void readpng(const char *filepath, png_byte **row_pointers)
{
FILE *fp = fopen(filepath, "rb");
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);
png_read_update_info(png_ptr, info_ptr);
png_read_image(png_ptr, row_pointers);
free(info_ptr);
free(png_ptr);
fclose(fp);
}
void writepng(const char *filename, png_byte **f)
{
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_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);
}
png_byte **createinputMatrix(short h, short w)
{
png_byte **rows = _mm_malloc(h * sizeof(png_bytepp), sizeof(png_bytepp));
short i, j;
png_byte sum = 0;
#pragma omp parallel for default(none) shared(rows, h, w) private(i, j) reduction(+ \
: sum) schedule(dynamic)
for (i = 0; i < h; i++)
{
rows[i] = _mm_malloc(sizeof(png_byte *) * w, sizeof(png_bytepp));
for (j = 0; j < w; j++)
rows[i][j] = 255;
}
return rows;
}
double start = 0, elapsed = 0, end = 0, flops = 0;
size_t sum;
void test(const char *infile, const char *outfile)
{
initHeightWidth(infile);
write = createinputMatrix(height, width);
read = createinputMatrix(height, width);
readpng(infile, read);
size_t h, w;
int count = 10;
double x, y;
for (int i = 0; i < count; i++)
{
start = omp_get_wtime();
#pragma omp parallel for default(none) shared(read, write, height, width) private(h, w) reduction(+ \
: sum) schedule(dynamic)
for (h = 1; h < height - 1; h++)
for (w = 1; w < width - 1; w++)
{
sum = (-1 * read[h - 1][w - 1]) + (-1 * read[h - 1][w]) + (-1 * read[h - 1][w + 1]) +
(-1 * read[h][w - 1]) + (8 * read[h][w]) + (-1 * read[h][w + 1]) +
(-1 * read[h + 1][w - 1]) + (-1 * read[h + 1][w]) + (-1 * read[h + 1][w + 1]);
sum = sum < 0 ? 0 : sum;
sum = sum > 255 ? 255 : sum;
write[h][w] = sum;
}
end = omp_get_wtime();
x = (end - start) * 1000;
y = ((height - 2) * (width - 2) * 18) / x / 1000000;
elapsed += x;
flops += y;
printf("-> Computaton Time elapsed : %f s and %f Gflop/s \n", x, y);
}
printf("-------------------------------------------------------\n");
printf("Averaged elapsed time for %d cycle(s) : %f ms\n", count, elapsed / count);
printf("Averaged FLOPS for %d cycle(s) : %f GFLOP/s\n", count, (double)(flops / count));
writepng(outfile, write);
printf("-> finished!\n");
}
void main()
{
test("test-image.png", "output.png");
}