Refactor xcomposite

Move common code between cuda/vaapi implementations
into xcomposite file.
This also fixes limited/full range colors on nvidia.

include/capture/xcomposite.h

@@ -0,0 +1,46 @@
+#ifndef GSR_CAPTURE_XCOMPOSITE_H
+#define GSR_CAPTURE_XCOMPOSITE_H
+
+#include "capture.h"
+#include "../egl.h"
+#include "../vec2.h"
+#include "../color_conversion.h"
+#include "../window_texture.h"
+
+typedef struct {
+    gsr_egl *egl;
+    Window window;
+    bool follow_focused; /* If this is set then |window| is ignored */
+    vec2i region_size; /* This is currently only used with |follow_focused| */
+    gsr_color_range color_range;
+} gsr_capture_xcomposite_params;
+
+typedef struct {
+    gsr_capture_base base;
+    gsr_capture_xcomposite_params params;
+    XEvent xev;
+
+    bool should_stop;
+    bool stop_is_error;
+    bool window_resized;
+    bool follow_focused_initialized;
+
+    Window window;
+    vec2i window_size;
+    vec2i texture_size;
+    double window_resize_timer;
+    
+    WindowTexture window_texture;
+
+    Atom net_active_window_atom;
+} gsr_capture_xcomposite;
+
+void gsr_capture_xcomposite_init(gsr_capture_xcomposite *self, const gsr_capture_xcomposite_params *params);
+
+int gsr_capture_xcomposite_start(gsr_capture_xcomposite *self, AVCodecContext *video_codec_context, AVFrame *frame);
+void gsr_capture_xcomposite_stop(gsr_capture_xcomposite *self, AVCodecContext *video_codec_context);
+void gsr_capture_xcomposite_tick(gsr_capture_xcomposite *self, AVCodecContext *video_codec_context);
+bool gsr_capture_xcomposite_should_stop(gsr_capture_xcomposite *self, bool *err);
+int gsr_capture_xcomposite_capture(gsr_capture_xcomposite *self, AVFrame *frame);
+
+#endif /* GSR_CAPTURE_XCOMPOSITE_H */