scrcpy/app/src/screen.h

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#ifndef SCREEN_H
#define SCREEN_H
#include "common.h"
#include <stdbool.h>
#include <SDL2/SDL.h>
#include <libavformat/avformat.h>
#include "coords.h"
#include "opengl.h"
#include "trait/frame_sink.h"
#include "video_buffer.h"
struct screen {
struct sc_frame_sink frame_sink; // frame sink trait
#ifndef NDEBUG
bool open; // track the open/close state to assert correct behavior
#endif
struct video_buffer vb;
struct fps_counter fps_counter;
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *texture;
struct sc_opengl gl;
struct size frame_size;
struct size content_size; // rotated frame_size
bool resize_pending; // resize requested while fullscreen or maximized
// The content size the last time the window was not maximized or
// fullscreen (meaningful only when resize_pending is true)
struct size windowed_content_size;
// client rotation: 0, 1, 2 or 3 (x90 degrees counterclockwise)
unsigned rotation;
// rectangle of the content (excluding black borders)
struct SDL_Rect rect;
bool has_frame;
bool fullscreen;
bool maximized;
bool mipmaps;
AVFrame *frame;
};
struct screen_params {
const char *window_title;
struct size frame_size;
bool always_on_top;
int16_t window_x;
int16_t window_y;
uint16_t window_width; // accepts SC_WINDOW_POSITION_UNDEFINED
uint16_t window_height; // accepts SC_WINDOW_POSITION_UNDEFINED
bool window_borderless;
uint8_t rotation;
bool mipmaps;
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bool fullscreen;
};
Improve startup time On startup, the client has to: 1. listen on a port 2. push and start the server to the device 3. wait for the server to connect (accept) 4. read device name and size 5. initialize SDL 6. initialize the window and renderer 7. show the window From the execution of the app_process command to start the server on the device, to the execution of the java main method, it takes ~800ms. As a consequence, step 3 also takes ~800ms on the client. Once complete, the client initializes SDL, which takes ~500ms. These two expensive actions are executed sequentially: HOST DEVICE listen on port | | push/start the server |----------------->|| app_process loads the jar accept the connection . ^ || . | || . | WASTE || . | OF || . | TIME || . | || . | || . v X execution of our java main connection accepted |<-----------------| connect to the host init SDL || | || ,----------------| send frames || |,---------------| || ||,--------------| || |||,-------------| || ||||,------------| init window/renderer | |||||,-----------| display frames |<++++++-----------| (many frames skipped) The rationale for step 3 occuring before step 5 is that initializing SDL replaces the SIGTERM handler to receive the event in the event loop, so pressing Ctrl+C during step 5 would not work (since it blocks the event loop). But this is not so important; let's parallelize the SDL initialization with the app_process execution (we'll just add a timeout to the connection): HOST DEVICE listen on port | | push/start the server |----------------->||app_process loads the jar init SDL || || || || || || || || || || || || accept the connection . || . X execution of our java main connection accepted |<-----------------| connect to the host init window/renderer | | display frames |<-----------------| send frames |<-----------------| In addition, show the window only once the first frame is available to avoid flickering (opening a black window for 100~200ms). Note: the window and renderer are initialized after the connection is accepted because they use the device information received from the device.
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// initialize screen, create window, renderer and texture (window is hidden)
bool
screen_init(struct screen *screen, const struct screen_params *params);
// request to interrupt any inner thread
// must be called before screen_join()
void
screen_interrupt(struct screen *screen);
// join any inner thread
void
screen_join(struct screen *screen);
// destroy window, renderer and texture (if any)
void
screen_destroy(struct screen *screen);
// hide the window
//
// It is used to hide the window immediately on closing without waiting for
// screen_destroy()
void
screen_hide_window(struct screen *screen);
// render the texture to the renderer
//
// Set the update_content_rect flag if the window or content size may have
// changed, so that the content rectangle is recomputed
void
screen_render(struct screen *screen, bool update_content_rect);
// 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 SDL events
bool
screen_handle_event(struct screen *screen, SDL_Event *event);
// convert point from window coordinates to frame coordinates
// x and y are expressed in pixels
struct point
screen_convert_window_to_frame_coords(struct screen *screen,
int32_t x, int32_t y);
// convert point from drawable coordinates to frame coordinates
// x and y are expressed in pixels
struct point
screen_convert_drawable_to_frame_coords(struct screen *screen,
int32_t x, int32_t y);
// Convert coordinates from window to drawable.
// Events are expressed in window coordinates, but content is expressed in
// drawable coordinates. They are the same if HiDPI scaling is 1, but differ
// otherwise.
void
screen_hidpi_scale_coords(struct screen *screen, int32_t *x, int32_t *y);
#endif