minecraft-pi-reborn/mods/src/screenshot/screenshot.c

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#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <FreeImage.h>
#include <GLES/gl.h>
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#include <libreborn/libreborn.h>
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#include "screenshot.h"
// 4 (Year + 1 (Hyphen) + 2 (Month) + 1 (Hyphen) + 2 (Day) + 1 (Underscore) + 2 (Hour) + 1 (Period) + 2 (Minute) + 1 (Period) + 2 (Second) + 1 (Terminator)
#define TIME_SIZE 20
// Take Screenshot
void take_screenshot() {
time_t rawtime;
struct tm *timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
char time[TIME_SIZE];
strftime(time, TIME_SIZE, "%Y-%m-%d_%H.%M.%S", timeinfo);
char *screenshots = NULL;
asprintf(&screenshots, "%s/.minecraft/screenshots", getenv("HOME"));
int num = 1;
char *file = NULL;
asprintf(&file, "%s/%s.png", screenshots, time);
while (access(file, F_OK) != -1) {
asprintf(&file, "%s/%s-%i.png", screenshots, time, num);
num++;
}
GLint viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
int x = viewport[0];
int y = viewport[1];
int width = viewport[2];
int height = viewport[3];
int line_size = width * 3;
int size = height * line_size;
unsigned char pixels[size];
glReadPixels(x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
// Swap Red And Blue
for (int i = 0; i < (size / 3); i++) {
int pixel = i * 3;
int red = pixels[pixel];
int blue = pixels[pixel + 2];
pixels[pixel] = blue;
pixels[pixel + 2] = red;
}
#endif
FIBITMAP *image = FreeImage_ConvertFromRawBits(pixels, width, height, line_size, 24, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK, 0);
if (!FreeImage_Save(FIF_PNG, image, file, 0)) {
INFO("Screenshot Failed: %s", file);
} else {
INFO("Screenshot Saved: %s", file);
}
FreeImage_Unload(image);
free(file);
free(screenshots);
}
// Init FreeImage
__attribute__((constructor)) static void init() {
FreeImage_Initialise(0);
}