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