FramebufferFun/framebuffer.cpp

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2024-06-18 21:43:41 +00:00
#include "framebuffer.hpp"
#include <string>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <unistd.h>
#include <stdio.h>
Framebuffer::Framebuffer(std::string devicePath) {
char *devicePathCharArray = new char[devicePath.length()]();
for(int i = 0; i < (int) devicePath.length(); i++) {
devicePathCharArray[i] = devicePath[i];
}
this->devicePath = devicePathCharArray;
}
int Framebuffer::init() {
if(devicePath == NULL || isDeviceOpen) return -1;
device = open(devicePath, O_RDWR);
struct fb_var_screeninfo screeninfo;
ioctl(device, FBIOGET_VSCREENINFO, &screeninfo);
bitsPerPixel = screeninfo.bits_per_pixel;
if(bitsPerPixel != 32) {
printf("Colorscale: %i bits per pixel\n", bitsPerPixel);
printf("Change the colordepth to 32 bits per pixel\n");
close(device);
return -1;
}
width = screeninfo.xres;
height = screeninfo.yres;
bytesPerPixel = bitsPerPixel / 8;
if(sizeof(unsigned int) != bytesPerPixel) {
close(device);
return -1;
}
isDeviceOpen = true;
mmapData();
return 0;
}
int Framebuffer::getWidth() {
return width;
}
int Framebuffer::getHeight() {
return height;
}
int Framebuffer::getBytesPerPixel() {
return bytesPerPixel;
}
void Framebuffer::mmapData() {
data = (unsigned int*) mmap(0, width * height * bytesPerPixel,
PROT_READ | PROT_WRITE, MAP_SHARED, device, 0);
isDataMapped = true;
}
int Framebuffer::setPixel(int x, int y, unsigned int color) {
if(isDataMapped)
data[y * width + x] = color;
else
return -1;
return 0;
}
int Framebuffer::clear(unsigned int color) {
for(int row = 0; row < height; row++) {
for(int column = 0; column < width; column++) {
int success = setPixel(column, row, color);
if(success != 0) return -1;
}
}
return 0;
}
void Framebuffer::munmapData() {
munmap(data, width * height * bytesPerPixel);
isDataMapped = false;
}
void Framebuffer::done() {
if(isDataMapped) munmapData();
if(isDeviceOpen) {
close(device);
isDeviceOpen = false;
}
}