scrcpy/app/src/screen.h

#ifndef SCREEN_H
#define SCREEN_H

#include <stdbool.h>
#include <SDL2/SDL.h>
#include <libavformat/avformat.h>

#include "config.h"
#include "common.h"

#define WINDOW_POSITION_UNDEFINED (-0x8000)

struct video_buffer;

struct screen {
    SDL_Window *window;
    SDL_Renderer *renderer;
    SDL_Texture *texture;
    struct size frame_size;
    // The window size the last time it was not maximized or fullscreen.
    struct size windowed_window_size;
    // Since we receive the event SIZE_CHANGED before MAXIMIZED, we must be
    // able to revert the size to its non-maximized value.
    struct size windowed_window_size_backup;
    // client rotation: 0, 1, 2 or 3 (x90 degrees counterclockwise)
    unsigned rotation;
    bool has_frame;
    bool fullscreen;
    bool maximized;
    bool no_window;
};

#define SCREEN_INITIALIZER { \
    .window = NULL, \
    .renderer = NULL, \
    .texture = NULL, \
    .frame_size = { \
        .width = 0,  \
        .height = 0, \
    }, \
    .windowed_window_size = { \
        .width = 0, \
        .height = 0, \
    }, \
    .windowed_window_size_backup = { \
        .width = 0, \
        .height = 0, \
    }, \
    .rotation = 0, \
    .has_frame = false, \
    .fullscreen = false, \
    .maximized = false, \
    .no_window = false, \
}

// initialize default values
void
screen_init(struct screen *screen);

// initialize screen, create window, renderer and texture (window is hidden)
// window_x and window_y accept WINDOW_POSITION_UNDEFINED
bool
screen_init_rendering(struct screen *screen, const char *window_title,
                      struct size frame_size, bool always_on_top,
                      int16_t window_x, int16_t window_y, uint16_t window_width,
                      uint16_t window_height, bool window_borderless,
                      uint8_t rotation);

// show the window
void
screen_show_window(struct screen *screen);

// destroy window, renderer and texture (if any)
void
screen_destroy(struct screen *screen);

// resize if necessary and write the rendered frame into the texture
bool
screen_update_frame(struct screen *screen, struct video_buffer *vb);

// render the texture to the renderer
void
screen_render(struct screen *screen);

// switch the fullscreen mode
void
screen_switch_fullscreen(struct screen *screen);

// resize window to optimal size (remove black borders)
void
screen_resize_to_fit(struct screen *screen);

// resize window to 1:1 (pixel-perfect)
void
screen_resize_to_pixel_perfect(struct screen *screen);

// set the display rotation (0, 1, 2 or 3, x90 degrees counterclockwise)
void
screen_set_rotation(struct screen *screen, unsigned rotation);

// react to window events
void
screen_handle_window_event(struct screen *screen, const SDL_WindowEvent *event);

#endif