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imageloader.c
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imageloader.c
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/************************************************************************
**
** NAME: imageloader.c
**
** DESCRIPTION: CS61C Fall 2020 Project 1
**
** AUTHOR: Dan Garcia - University of California at Berkeley
** Copyright (C) Dan Garcia, 2020. All rights reserved.
** Justin Yokota - Starter Code
** YOUR NAME HERE
**
**
** DATE: 2020-08-15
**
**************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include "imageloader.h"
//Opens a .ppm P3 image file, and constructs an Image object.
//You may find the function fscanf useful.
//Make sure that you close the file with fclose before returning.
Image *readData(char *filename)
{
Image *image_st = (Image *) malloc(sizeof(Image));
FILE *fp = fopen(filename, "r");
char identifier[20];
uint32_t cols = 0, rows = 0;
uint32_t index_col = 0, index_row = 0;
int R, G, B;
int max_value;
Color *pixel = NULL;
fscanf(fp, "%s %d %d %d", identifier, &cols, &rows, &max_value);
image_st->cols = cols;
image_st->rows = rows;
image_st->image = (Color **) malloc(sizeof(Color *) * rows);
for (index_row = 0; index_row < rows; ++index_row) {
Color *row = (Color *) malloc(sizeof(Color) * cols);
for (index_col = 0; index_col < cols; ++index_col) {
pixel = &row[index_col];
fscanf(fp, "%d %d %d", &R, &G, &B);
pixel->R = (uint8_t) R;
pixel->G = (uint8_t) G;
pixel->B = (uint8_t) B;
}
image_st->image[index_row] = row;
}
fclose(fp);
return image_st;
}
//Given an image, prints to stdout (e.g. with printf) a .ppm P3 file with the image's data.
void writeData(Image *image)
{
Color *pixel = NULL;
printf("P3\n%d %d\n255\n", image->cols, image->rows);
uint32_t i = 0, j = 0;
for (i = 0; i < image->rows; ++i) {
for (j = 0; j < image->cols - 1; ++j) {
pixel = &(image->image[i][j]);
printf("%3d %3d %3d ", (int)pixel->R, (int)pixel->G, (int)pixel->B);
}
pixel = &(image->image[i][j]);
printf("%3d %3d %3d\n", (int)pixel->R, (int)pixel->G, (int)pixel->B);
}
}
//Frees an image
void freeImage(Image *image)
{
uint32_t row = 0;
for (row = 0; row < image->rows; ++row) {
free(image->image[row]);
}
free(image->image);
free(image);
}