Add support for desktop portal capture (-w portal)

include/pipewire.h

@@ -0,0 +1,83 @@
+#ifndef GSR_PIPEWIRE_H
+#define GSR_PIPEWIRE_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <pthread.h>
+
+#include <spa/utils/hook.h>
+#include <spa/param/video/format.h>
+
+typedef struct gsr_egl gsr_egl;
+
+typedef struct {
+    int major;
+    int minor;
+    int micro;
+} gsr_pipewire_data_version;
+
+typedef struct {
+    uint32_t fps_num;
+    uint32_t fps_den;
+} gsr_pipewire_video_info;
+
+typedef struct {
+    int fd;
+    uint32_t offset;
+    int32_t stride;
+} gsr_pipewire_dmabuf_data;
+
+typedef struct {
+    int x, y;
+    int width, height;
+} gsr_pipewire_region;
+
+typedef struct {
+    gsr_egl *egl;
+    int fd;
+    uint32_t node;
+    pthread_mutex_t mutex;
+    bool mutex_initialized;
+
+    struct pw_thread_loop *thread_loop;
+    struct pw_context *context;
+    struct pw_core *core;
+    struct spa_hook core_listener;
+    struct pw_stream *stream;
+    struct spa_hook stream_listener;
+    struct spa_source *reneg;
+    struct spa_video_info format;
+    int server_version_sync;
+    bool negotiated;
+
+    struct {
+        bool visible;
+        bool valid;
+        uint8_t *data;
+        int x, y;
+        int hotspot_x, hotspot_y;
+        int width, height;
+    } cursor;
+
+    struct {
+        bool valid;
+        int x, y;
+        uint32_t width, height;
+    } crop;
+
+    gsr_pipewire_data_version server_version;
+    gsr_pipewire_video_info video_info;
+    gsr_pipewire_dmabuf_data dmabuf_data;
+} gsr_pipewire;
+
+/*
+    |capture_cursor| only applies to when capturing a window or region.
+    In other cases |pipewire_node|'s setup will determine if the cursor is included.
+    Note that the cursor is not guaranteed to be shown even if set to true, it depends on the wayland compositor.
+*/
+bool gsr_pipewire_init(gsr_pipewire *self, int pipewire_fd, uint32_t pipewire_node, int fps, bool capture_cursor, gsr_egl *egl);
+void gsr_pipewire_deinit(gsr_pipewire *self);
+
+bool gsr_pipewire_map_texture(gsr_pipewire *self, unsigned int texture_id, unsigned int cursor_texture_id, gsr_pipewire_region *region, gsr_pipewire_region *cursor_region);
+
+#endif /* GSR_PIPEWIRE_H */