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138 lines
4.5 KiB
138 lines
4.5 KiB
#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <wayland-client-core.h>
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#include <wayland-client-protocol.h>
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#include <wayland-client.h>
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#include "wlr-screencopy-client-protocol.h"
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#include "rif.h"
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#define ASSERT(cond, msg)\
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if(!(cond)) {\
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fprintf(stderr, "Runtime assertion %s at %s:%d failed: %s\n", #cond, __FILE__, __LINE__, msg);\
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exit(-1);\
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}
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// Not included in any standard header
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// Thus, declaring manually.
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// See memfd_create(2).
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int memfd_create(const char* name, unsigned int flags);
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struct wl_output* wl_output = NULL;
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struct wl_shm* wl_shm = NULL;
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struct zwlr_screencopy_manager_v1* zwlr_manager = NULL;
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int8_t ready = 0;
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uint32_t buf_size = 0;
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void* shm_data = NULL;
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uint32_t image_width = 0;
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uint32_t image_height = 0;
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uint32_t image_format = 0;
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void handle_global(void* data, struct wl_registry* registry, uint32_t name, const char* interface, uint32_t version) {
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if(strcmp(interface, wl_shm_interface.name) == 0) {
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wl_shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
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} else if(strcmp(interface, wl_output_interface.name) == 0) {
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wl_output = wl_registry_bind(registry, name, &wl_output_interface, 3);
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} else if(strcmp(interface, zwlr_screencopy_manager_v1_interface.name) == 0) {
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zwlr_manager = wl_registry_bind(registry, name, &zwlr_screencopy_manager_v1_interface, 1);
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}
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}
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void handle_global_remove(void* data, struct wl_registry* registry, uint32_t name) {
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// Who cares
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}
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const struct wl_registry_listener reg_callbacks = {
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.global = handle_global,
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.global_remove = handle_global_remove,
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};
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void frame_handle_buffer(void* data, struct zwlr_screencopy_frame_v1* frame, uint32_t format, uint32_t width, uint32_t height, uint32_t stride) {
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printf("Handling buffer.\n");
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image_width = width;
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image_height = height;
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image_format = format;
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buf_size = height * stride;
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printf("Format: %010p\n", format);
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ASSERT(format == WL_SHM_FORMAT_XBGR8888 || format == WL_SHM_FORMAT_ABGR8888, "Unsupported buffer format copied.");
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int shm_fd = memfd_create("wl_shm data", 0);
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ASSERT(shm_fd != -1, "Failed to create memfd.");
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ASSERT(ftruncate(shm_fd, buf_size) != -1, "Failed to ftruncate the memfd.");
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shm_data = mmap(NULL, buf_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
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ASSERT(shm_data != MAP_FAILED, "Failed to mmap the memfd.");
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struct wl_shm_pool* pool = wl_shm_create_pool(wl_shm, shm_fd, buf_size);
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ASSERT(pool != NULL, "Failed to create the wl_shm_pool.");
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struct wl_buffer* buffer = wl_shm_pool_create_buffer(pool, 0, width, height, stride, format);
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ASSERT(buffer != NULL, "Failed to create the wl_buffer.");
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zwlr_screencopy_frame_v1_copy(frame, buffer);
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}
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void frame_handle_flags(void* data, struct zwlr_screencopy_frame_v1* frame, uint32_t flags) {
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// Ignored for now
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}
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void frame_handle_ready(void *data, struct zwlr_screencopy_frame_v1 *frame, uint32_t tv_sec_hi, uint32_t tv_sec_lo, uint32_t tv_nsec) {
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printf("Ready.\n");
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ready = 1;
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}
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void frame_handle_failed(void* data, struct zwlr_screencopy_frame_v1* frame) {
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fprintf(stderr, "Failed to copy output\n");
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exit(EXIT_FAILURE);
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}
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static const struct zwlr_screencopy_frame_v1_listener frame_listener = {
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.buffer = frame_handle_buffer,
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.flags = frame_handle_flags,
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.ready = frame_handle_ready,
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.failed = frame_handle_failed,
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};
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int main() {
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struct wl_display* dpy = wl_display_connect(NULL);
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ASSERT(dpy != NULL, "Unable to connect to Wayland");
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struct wl_registry* registry = wl_display_get_registry(dpy);
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wl_registry_add_listener(registry, ®_callbacks, NULL);
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wl_display_roundtrip(dpy);
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ASSERT(wl_shm != NULL, "core.wl_shm not supported.");
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ASSERT(zwlr_manager != NULL, "wlr-screencopy-unstable-v1.zwlr_screencopy_manager_v1 not supported.");
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ASSERT(wl_output != NULL, "no core.wl_output found.");
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int32_t with_cursor = 1;
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struct zwlr_screencopy_frame_v1* frame = zwlr_screencopy_manager_v1_capture_output(zwlr_manager, with_cursor, wl_output);
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ASSERT(frame != NULL, "wlr-screencopy-unstable-v1.zwlr_screencopy_manager_v1::capture_output has failed");
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zwlr_screencopy_frame_v1_add_listener(frame, &frame_listener, wl_output);
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wl_display_roundtrip(dpy);
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while(ready == 0 && wl_display_dispatch(dpy) != -1) {
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// Empty
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}
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printf("Saving screenshot.\n");
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// void write_rif_little(char* path, uint32_t width, uint32_t size, uint8_t format, void* data) {
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// Thanks to endianess shenanigans, ABGR/XBGR is RGBA.
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write_rif_little("out.rif", image_width, buf_size, RIF_FORMAT_R8G8B8A8, shm_data);
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printf("Saved screenshot to ./out.rif.\n");
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}
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