banan-os/userspace/image/main.cpp

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#include <LibImage/Image.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/framebuffer.h>
#include <sys/mman.h>
#include <unistd.h>
void render_to_framebuffer(BAN::UniqPtr<LibImage::Image> image, bool scale)
{
int fd = open("/dev/fb0", O_RDWR);
if (fd == -1)
{
perror("open");
exit(1);
}
framebuffer_info_t fb_info;
if (pread(fd, &fb_info, sizeof(fb_info), -1) == -1)
{
perror("pread");
exit(1);
}
if (scale)
image = MUST(image->resize(fb_info.width, fb_info.height));
ASSERT(BANAN_FB_BPP == 24 || BANAN_FB_BPP == 32);
size_t mmap_size = fb_info.height * fb_info.width * BANAN_FB_BPP / 8;
void* mmap_addr = mmap(nullptr, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mmap_addr == MAP_FAILED)
{
perror("mmap");
exit(1);
}
uint8_t* u8_fb = reinterpret_cast<uint8_t*>(mmap_addr);
const auto& bitmap = image->bitmap();
for (uint64_t y = 0; y < BAN::Math::min<uint64_t>(image->height(), fb_info.height); y++)
{
for (uint64_t x = 0; x < BAN::Math::min<uint64_t>(image->width(), fb_info.width); x++)
{
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 0] = bitmap[y * image->width() + x].b;
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 1] = bitmap[y * image->width() + x].g;
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 2] = bitmap[y * image->width() + x].r;
if constexpr(BANAN_FB_BPP == 32)
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 3] = bitmap[y * image->width() + x].a;
}
}
if (msync(mmap_addr, mmap_size, MS_SYNC) == -1)
{
perror("msync");
exit(1);
}
munmap(mmap_addr, mmap_size);
close(fd);
}
int usage(char* arg0, int ret)
{
FILE* out = (ret == 0) ? stdout : stderr;
fprintf(out, "usage: %s [options]... IMAGE_PATH\n", arg0);
fprintf(out, "options:\n");
fprintf(out, " -h, --help: show this message and exit\n");
fprintf(out, " -s, --scale: scale image to framebuffer size\n");
return ret;
}
int main(int argc, char** argv)
{
if (argc < 2)
return usage(argv[0], 1);
bool scale = false;
for (int i = 1; i < argc - 1; i++)
{
if (strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "--scale") == 0)
scale = true;
else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0)
return usage(argv[0], 0);
else
return usage(argv[0], 1);
}
auto image = MUST(LibImage::Image::load_from_file(argv[argc - 1]));
render_to_framebuffer(BAN::move(image), scale);
for (;;)
sleep(1);
return 0;
}