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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
** Frank Warren
**
**
** 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) {
uint32_t cols = 0, rows = 0;
FILE *fp = fopen(filename, "r");
Image *image = malloc(sizeof(Image));
if (!image) { return NULL; }
fscanf(fp, "%*s %i %i %*s", &cols, &rows);
image->cols = cols;
image->rows = rows;
image->image = calloc(rows, sizeof(Color*)); // Pointers to rows
if (!(image->image)) { exit(-1); }
uint8_t R, G, B;
for (int row=0; row < rows; row++) {
(image->image)[row] = calloc(cols, sizeof(Color)); // Pointers to column entries
for (int col=0; col < cols; col++) {
fscanf(fp, "%hhu %hhu %hhu", &R, &G, &B);
Color color = {R, G, B};
image->image[row][col] = color;
}
}
fclose(fp);
return image;
}
//Given an image, prints to stdout (e.g. with printf) a .ppm P3 file with the image's data.
void writeData(Image *image) {
printf("P3\n%d %d\n255\n", image->cols, image->rows);
Color **colors = (image->image);
for (int row=0; row < image->rows; row++) {
for (int col=0; col < image->cols-1; col++) {
Color color = colors[row][col];
printf("%*hhu %*hhu %*hhu ", 3, color.R, 3, color.G, 3, color.B);
if (col == image->cols - 2) {
col++;
color = colors[row][col];
printf("%*hhu %*hhu %*hhu\n", 3, color.R, 3, color.G, 3, color.B);
}
}
}
}
//Frees an image
void freeImage(Image *image) {
for (int row=0; row < image->rows; row++) {
free(image->image[row]);
}
free(image->image);
free(image);
}