Ivan Baravy
3345936052
In theory, should work under X and Wayland. It won't work under Windows though because of used system calls.
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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SPDX-License-Identifier: GPL-2.0-or-later
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UMKa - User-Mode KolibriOS developer tools
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lfbview - KolibriOS framebuffer viewer via SDL2
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Copyright (C) 2023 Ivan Baravy <dunkaist@gmail.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <SDL2/SDL.h>
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int
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main(int argc, char *argv[]) {
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const char *usage = "usage: lfbview <pid> <address> <width> <height>";
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if (argc != 5) {
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puts(usage);
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exit(1);
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}
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int depth = 32;
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int umka_pid = strtol(argv[1], NULL, 0);
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uintptr_t umka_lfb_addr = strtol(argv[2], NULL, 0);
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size_t lfb_width = strtoul(argv[3], NULL, 0);
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size_t lfb_height = strtoul(argv[4], NULL, 0);
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if(SDL_Init(SDL_INIT_VIDEO) < 0)
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{
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fprintf(stderr, "Failed to initialize the SDL2 library\n");
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return -1;
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}
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SDL_Window *window = SDL_CreateWindow("LFB Viewer SDL2",
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SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED,
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400, 300,
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0);
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if(!window)
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{
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fprintf(stderr, "Failed to create window\n");
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return -1;
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}
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SDL_Surface *window_surface = SDL_GetWindowSurface(window);
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if(!window_surface)
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{
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fprintf(stderr, "Failed to get the surface from the window\n");
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return -1;
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}
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uint32_t *lfb = (uint32_t*)malloc(lfb_width*lfb_height*sizeof(uint32_t));
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struct iovec remote = {.iov_base = (void*)umka_lfb_addr,
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.iov_len = lfb_width*lfb_height*4};
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struct iovec local = {.iov_base = lfb,
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.iov_len = lfb_width*lfb_height*4};
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uint32_t *p = window_surface->pixels;
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while (1) {
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process_vm_readv(umka_pid, &local, 1, &remote, 1, 0);
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memcpy(window_surface->pixels, lfb, 400*300*4);
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SDL_LockSurface(window_surface);
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for (size_t y = 0; y < window_surface->h; y++) {
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for (size_t x = 0; x < window_surface->w; x++) {
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p[y*window_surface->pitch/4+x] = lfb[y*400+x];
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}
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}
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SDL_UnlockSurface(window_surface);
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SDL_UpdateWindowSurface(window);
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sleep(1);
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}
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return 0;
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}
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