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Move screen-related code to screen.c

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The file scrcpy.c contains too many different things in addition to the
main logic, so move the screen code to a separate file, screen.c.
This commit is contained in:
Romain Vimont 2018-02-08 11:14:13 +01:00
parent 14c58546a7
commit 6c578b5caa
5 changed files with 390 additions and 276 deletions
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1
app/meson.build
View file

@ -11,6 +11,7 @@ src = [
'src/lockutil.c',
'src/netutil.c',
'src/scrcpy.c',
'src/screen.c',
'src/server.c',
'src/strutil.c',
'src/tinyxpm.c',

305
app/src/scrcpy.c
View file

@ -17,27 +17,17 @@
#include "frames.h"
#include "lockutil.h"
#include "netutil.h"
#include "screen.h"
#include "server.h"
#include "tinyxpm.h"
#include "icon.xpm"
#define DEVICE_NAME_FIELD_LENGTH 64
#define DISPLAY_MARGINS 96
static struct screen screen = SCREEN_INITIALIZER;
static struct frames frames;
static struct decoder decoder;
static struct controller controller;
static SDL_Window *window;
static SDL_Renderer *renderer;
static SDL_Texture *texture;
static struct size frame_size;
// used only in fullscreen mode to know the windowed window size
static struct size windowed_window_size;
static SDL_bool texture_empty = SDL_TRUE;
static SDL_bool fullscreen = SDL_FALSE;
static long timestamp_ms(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
@ -79,48 +69,7 @@ static SDL_bool read_initial_device_info(TCPsocket socket, char *device_name, st
return SDL_TRUE;
}
#if SDL_VERSION_ATLEAST(2, 0, 5)
# define GET_DISPLAY_BOUNDS(i, r) SDL_GetDisplayUsableBounds((i), (r))
#else
# define GET_DISPLAY_BOUNDS(i, r) SDL_GetDisplayBounds((i), (r))
#endif
// init the preferred display_bounds (i.e. the screen bounds with some margins)
static SDL_bool get_preferred_display_bounds(struct size *bounds) {
SDL_Rect rect;
if (GET_DISPLAY_BOUNDS(0, &rect)) {
SDL_LogWarn(SDL_LOG_CATEGORY_SYSTEM, "Could not get display usable bounds: %s", SDL_GetError());
return SDL_FALSE;
}
bounds->width = MAX(0, rect.w - DISPLAY_MARGINS);
bounds->height = MAX(0, rect.h - DISPLAY_MARGINS);
return SDL_TRUE;
}
static inline struct size get_window_size(SDL_Window *window) {
int width;
int height;
SDL_GetWindowSize(window, &width, &height);
struct size size;
size.width = width;
size.height = height;
return size;
}
static void set_window_size(SDL_Window *window, struct size new_size) {
// setting the window size during fullscreen is implementation defined,
// so apply the resize only after fullscreen is disabled
if (fullscreen) {
// SDL_SetWindowSize will be called when fullscreen will be disabled
windowed_window_size = new_size;
} else {
SDL_SetWindowSize(window, new_size.width, new_size.height);
}
}
static inline struct point get_mouse_point() {
static struct point get_mouse_point(void) {
int x;
int y;
SDL_GetMouseState(&x, &y);
@ -131,131 +80,6 @@ static inline struct point get_mouse_point() {
};
}
// return the optimal size of the window, with the following constraints:
// - it attempts to keep at least one dimension of the current_size (i.e. it crops the black borders)
// - it keeps the aspect ratio
// - it scales down to make it fit in the display_size
static struct size get_optimal_size(struct size current_size, struct size frame_size) {
struct size display_size;
// 32 bits because we need to multiply two 16 bits values
Uint32 w;
Uint32 h;
if (!get_preferred_display_bounds(&display_size)) {
// cannot get display bounds, do not constraint the size
w = current_size.width;
h = current_size.height;
} else {
w = MIN(current_size.width, display_size.width);
h = MIN(current_size.height, display_size.height);
}
SDL_bool keep_width = frame_size.width * h > frame_size.height * w;
if (keep_width) {
// remove black borders on top and bottom
h = frame_size.height * w / frame_size.width;
} else {
// remove black borders on left and right (or none at all if it already fits)
w = frame_size.width * h / frame_size.height;
}
// w and h must fit into 16 bits
SDL_assert_release(w < 0x10000 && h < 0x10000);
return (struct size) {w, h};
}
// initially, there is no current size, so use the frame size as current size
static inline struct size get_initial_optimal_size(struct size frame_size) {
return get_optimal_size(frame_size, frame_size);
}
// same as get_optimal_size(), but read the current size from the window
static inline struct size get_optimal_window_size(SDL_Window *window, struct size frame_size) {
struct size current_size = get_window_size(window);
return get_optimal_size(current_size, frame_size);
}
static SDL_bool prepare_for_frame(SDL_Window *window, SDL_Renderer *renderer, SDL_Texture **texture,
struct size old_frame_size, struct size frame_size) {
if (old_frame_size.width != frame_size.width || old_frame_size.height != frame_size.height) {
if (SDL_RenderSetLogicalSize(renderer, frame_size.width, frame_size.height)) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Could not set renderer logical size: %s", SDL_GetError());
return SDL_FALSE;
}
// frame dimension changed, destroy texture
SDL_DestroyTexture(*texture);
struct size current_size = get_window_size(window);
struct size target_size = {
(Uint32) current_size.width * frame_size.width / old_frame_size.width,
(Uint32) current_size.height * frame_size.height / old_frame_size.height,
};
target_size = get_optimal_size(target_size, frame_size);
set_window_size(window, target_size);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "New texture: %" PRIu16 "x%" PRIu16, frame_size.width, frame_size.height);
*texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, frame_size.width, frame_size.height);
if (!*texture) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create texture: %s", SDL_GetError());
return SDL_FALSE;
}
}
return SDL_TRUE;
}
static void update_texture(const AVFrame *frame, SDL_Texture *texture) {
SDL_UpdateYUVTexture(texture, NULL,
frame->data[0], frame->linesize[0],
frame->data[1], frame->linesize[1],
frame->data[2], frame->linesize[2]);
}
static void render(SDL_Renderer *renderer, SDL_Texture *texture) {
SDL_RenderClear(renderer);
if (texture) {
SDL_RenderCopy(renderer, texture, NULL, NULL);
}
SDL_RenderPresent(renderer);
}
static void switch_fullscreen(void) {
if (!fullscreen) {
// going to fullscreen, store the current windowed window size
windowed_window_size = get_window_size(window);
}
Uint32 new_mode = fullscreen ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP;
if (SDL_SetWindowFullscreen(window, new_mode)) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION, "Could not switch fullscreen mode: %s", SDL_GetError());
return;
}
fullscreen = !fullscreen;
if (!fullscreen) {
// fullscreen disabled, restore expected windowed window size
SDL_SetWindowSize(window, windowed_window_size.width, windowed_window_size.height);
}
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Switched to %s mode", fullscreen ? "fullscreen" : "windowed");
render(renderer, texture_empty ? NULL : texture);
}
static void resize_to_fit(void) {
if (!fullscreen) {
struct size optimal_size = get_optimal_window_size(window, frame_size);
SDL_SetWindowSize(window, optimal_size.width, optimal_size.height);
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Resized to optimal size");
}
}
static void resize_to_pixel_perfect(void) {
if (!fullscreen) {
SDL_SetWindowSize(window, frame_size.width, frame_size.height);
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Resized to pixel-perfect");
}
}
static int wait_for_success(process_t proc, const char *name) {
if (proc == PROCESS_NONE) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not execute \"%s\"", name);
@ -342,17 +166,12 @@ static SDL_bool handle_new_frame(void) {
cond_signal(frames.rendering_frame_consumed_cond);
#endif
struct size current_frame_size = {frame->width, frame->height};
if (!prepare_for_frame(window, renderer, &texture, frame_size, current_frame_size)) {
if (!screen_update(&screen, frame)){
return SDL_FALSE;
}
frame_size = current_frame_size;
update_texture(frame, texture);
mutex_unlock(frames.mutex);
render(renderer, texture);
screen_render(&screen);
return SDL_TRUE;
}
@ -416,13 +235,13 @@ static void handle_key(const SDL_KeyboardEvent *event) {
action_power();
return;
case SDLK_f:
switch_fullscreen();
screen_switch_fullscreen(&screen);
return;
case SDLK_x:
resize_to_fit();
screen_resize_to_fit(&screen);
return;
case SDLK_g:
resize_to_pixel_perfect();
screen_resize_to_pixel_perfect(&screen);
return;
}
@ -486,14 +305,13 @@ static void event_loop(void) {
if (!handle_new_frame()) {
return;
}
texture_empty = SDL_FALSE;
count_frame(); // display fps for debug
break;
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_EXPOSED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
render(renderer, texture_empty ? NULL : texture);
screen_render(&screen);
break;
}
break;
@ -506,11 +324,11 @@ static void event_loop(void) {
handle_key(&event.key);
break;
case SDL_MOUSEMOTION:
handle_mouse_motion(&event.motion, frame_size);
handle_mouse_motion(&event.motion, screen.frame_size);
break;
case SDL_MOUSEWHEEL: {
struct position position = {
.screen_size = frame_size,
.screen_size = screen.frame_size,
.point = get_mouse_point(),
};
handle_mouse_wheel(&event.wheel, position);
@ -518,7 +336,7 @@ static void event_loop(void) {
}
case SDL_MOUSEBUTTONDOWN:
case SDL_MOUSEBUTTONUP: {
handle_mouse_button(&event.button, frame_size);
handle_mouse_button(&event.button, screen.frame_size);
break;
}
}
@ -541,7 +359,7 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
TCPsocket server_socket = listen_on_port(local_port);
if (!server_socket) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not open video socket");
goto screen_finally_adb_reverse_remove;
goto finally_adb_reverse_remove;
}
// server will connect to our socket
@ -549,7 +367,7 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
if (server == PROCESS_NONE) {
ret = SDL_FALSE;
SDLNet_TCP_Close(server_socket);
goto screen_finally_adb_reverse_remove;
goto finally_adb_reverse_remove;
}
// to reduce startup time, we could be tempted to init other stuff before blocking here
@ -562,10 +380,11 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not accept video socket: %s", SDL_GetError());
ret = SDL_FALSE;
stop_server(server);
goto screen_finally_adb_reverse_remove;
goto finally_adb_reverse_remove;
}
char device_name[DEVICE_NAME_FIELD_LENGTH];
struct size frame_size;
// screenrecord does not send frames when the screen content does not change
// therefore, we transmit the screen size before the video stream, to be able
@ -575,14 +394,14 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto screen_finally_adb_reverse_remove;
goto finally_adb_reverse_remove;
}
if (!frames_init(&frames)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto screen_finally_adb_reverse_remove;
goto finally_adb_reverse_remove;
}
decoder.frames = &frames;
@ -594,105 +413,43 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto screen_finally_destroy_frames;
goto finally_destroy_frames;
}
if (!controller_init(&controller, device_socket)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto screen_finally_stop_decoder;
goto finally_stop_decoder;
}
if (!controller_start(&controller)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto screen_finally_destroy_controller;
goto finally_destroy_controller;
}
if (SDL_Init(SDL_INIT_VIDEO)) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL: %s", SDL_GetError());
if (!sdl_init_and_configure()) {
ret = SDL_FALSE;
goto screen_finally_stop_and_join_controller;
}
// FIXME it may crash in SDL_Quit in i965_dri.so
// As a workaround, do not call SDL_Quit() (we are exiting anyway).
// atexit(SDL_Quit);
// Bilinear resizing
if (!SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1")) {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not enable bilinear filtering");
goto finally_stop_and_join_controller;
}
#if SDL_VERSION_ATLEAST(2, 0, 5)
// Handle a click to gain focus as any other click
if (!SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1")) {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not enable mouse focus clickthrough");
}
#endif
struct size window_size = get_initial_optimal_size(frame_size);
window = SDL_CreateWindow(device_name, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
window_size.width, window_size.height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
if (!window) {
SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not create window: %s", SDL_GetError());
if (!screen_init_rendering(&screen, device_name, frame_size)) {
ret = SDL_FALSE;
goto screen_finally_stop_decoder;
goto finally_stop_and_join_controller;
}
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
if (!renderer) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create renderer: %s", SDL_GetError());
ret = SDL_FALSE;
goto screen_finally_destroy_window;
}
if (SDL_RenderSetLogicalSize(renderer, frame_size.width, frame_size.height)) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Could not set renderer logical size: %s", SDL_GetError());
ret = SDL_FALSE;
goto screen_finally_destroy_renderer;
}
SDL_Surface *icon = read_xpm(icon_xpm);
if (!icon) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not load icon: %s", SDL_GetError());
ret = SDL_FALSE;
goto screen_finally_destroy_renderer;
}
SDL_SetWindowIcon(window, icon);
SDL_FreeSurface(icon);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Initial texture: %" PRIu16 "x%" PRIu16, frame_size.width, frame_size.height);
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, frame_size.width, frame_size.height);
if (!texture) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create texture: %s", SDL_GetError());
ret = SDL_FALSE;
goto screen_finally_destroy_renderer;
}
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
event_loop();
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "quit...");
SDL_DestroyTexture(texture);
screen_finally_destroy_renderer:
// FIXME it may crash at exit if we destroy the renderer or the window,
// with the exact same stack trace as <https://bugs.launchpad.net/mir/+bug/1466535>.
// As a workaround, leak the renderer and the window (we are exiting anyway).
//SDL_DestroyRenderer(renderer);
screen_finally_destroy_window:
//SDL_DestroyWindow(window);
// at least we hide it
SDL_HideWindow(window);
screen_finally_stop_and_join_controller:
screen_destroy(&screen);
finally_stop_and_join_controller:
controller_stop(&controller);
controller_join(&controller);
screen_finally_destroy_controller:
finally_destroy_controller:
controller_destroy(&controller);
screen_finally_stop_decoder:
finally_stop_decoder:
SDLNet_TCP_Close(device_socket);
// let the server some time to print any exception trace before killing it
@ -705,9 +462,9 @@ screen_finally_stop_decoder:
// kill the server before decoder_join() to wake up the decoder
stop_server(server);
decoder_join(&decoder);
screen_finally_destroy_frames:
finally_destroy_frames:
frames_destroy(&frames);
screen_finally_adb_reverse_remove:
finally_adb_reverse_remove:
{
process_t remove = disable_tunnel(serial);
if (remove != PROCESS_NONE) {

4
app/src/scrcpy.h
View file

@ -1,5 +1,5 @@
#ifndef SCREEN_H
#define SCREEN_H
#ifndef SCRCPY_H
#define SCRCPY_H
#include <SDL2/SDL_stdinc.h>

291
app/src/screen.c Normal file
View file

@ -0,0 +1,291 @@
#include "screen.h"
#include <SDL2/SDL.h>
#include <string.h>
#include "icon.xpm"
#include "tinyxpm.h"
#define DISPLAY_MARGINS 96
SDL_bool sdl_init_and_configure(void) {
if (SDL_Init(SDL_INIT_VIDEO)) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL: %s", SDL_GetError());
return SDL_FALSE;
}
// FIXME it may crash in SDL_Quit in i965_dri.so
// As a workaround, do not call SDL_Quit() (we are exiting anyway).
// atexit(SDL_Quit);
// Bilinear resizing
if (!SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1")) {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not enable bilinear filtering");
}
#if SDL_VERSION_ATLEAST(2, 0, 5)
// Handle a click to gain focus as any other click
if (!SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1")) {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not enable mouse focus clickthrough");
}
#endif
return SDL_TRUE;
}
// get the window size in a struct size
static struct size get_native_window_size(SDL_Window *window) {
int width;
int height;
SDL_GetWindowSize(window, &width, &height);
struct size size;
size.width = width;
size.height = height;
return size;
}
// get the windowed window size
static struct size get_window_size(const struct screen *screen) {
if (screen->fullscreen) {
return screen->windowed_window_size;
}
return get_native_window_size(screen->window);
}
// set the window size to be applied when fullscreen is disabled
static void set_window_size(struct screen *screen, struct size new_size) {
// setting the window size during fullscreen is implementation defined,
// so apply the resize only after fullscreen is disabled
if (screen->fullscreen) {
// SDL_SetWindowSize will be called when fullscreen will be disabled
screen->windowed_window_size = new_size;
} else {
SDL_SetWindowSize(screen->window, new_size.width, new_size.height);
}
}
// get the preferred display bounds (i.e. the screen bounds with some margins)
static SDL_bool get_preferred_display_bounds(struct size *bounds) {
SDL_Rect rect;
#if SDL_VERSION_ATLEAST(2, 0, 5)
# define GET_DISPLAY_BOUNDS(i, r) SDL_GetDisplayUsableBounds((i), (r))
#else
# define GET_DISPLAY_BOUNDS(i, r) SDL_GetDisplayBounds((i), (r))
#endif
if (GET_DISPLAY_BOUNDS(0, &rect)) {
SDL_LogWarn(SDL_LOG_CATEGORY_SYSTEM, "Could not get display usable bounds: %s", SDL_GetError());
return SDL_FALSE;
}
bounds->width = MAX(0, rect.w - DISPLAY_MARGINS);
bounds->height = MAX(0, rect.h - DISPLAY_MARGINS);
return SDL_TRUE;
}
// return the optimal size of the window, with the following constraints:
// - it attempts to keep at least one dimension of the current_size (i.e. it crops the black borders)
// - it keeps the aspect ratio
// - it scales down to make it fit in the display_size
static struct size get_optimal_size(struct size current_size, struct size frame_size) {
struct size display_size;
// 32 bits because we need to multiply two 16 bits values
Uint32 w;
Uint32 h;
if (!get_preferred_display_bounds(&display_size)) {
// cannot get display bounds, do not constraint the size
w = current_size.width;
h = current_size.height;
} else {
w = MIN(current_size.width, display_size.width);
h = MIN(current_size.height, display_size.height);
}
SDL_bool keep_width = frame_size.width * h > frame_size.height * w;
if (keep_width) {
// remove black borders on top and bottom
h = frame_size.height * w / frame_size.width;
} else {
// remove black borders on left and right (or none at all if it already fits)
w = frame_size.width * h / frame_size.height;
}
// w and h must fit into 16 bits
SDL_assert_release(w < 0x10000 && h < 0x10000);
return (struct size) {w, h};
}
// same as get_optimal_size(), but read the current size from the window
static inline struct size get_optimal_window_size(const struct screen *screen, struct size frame_size) {
struct size current_size = get_window_size(screen);
return get_optimal_size(current_size, frame_size);
}
// initially, there is no current size, so use the frame size as current size
static inline struct size get_initial_optimal_size(struct size frame_size) {
return get_optimal_size(frame_size, frame_size);
}
void screen_init(struct screen *screen) {
*screen = (struct screen) SCREEN_INITIALIZER;
}
SDL_bool screen_init_rendering(struct screen *screen, const char *device_name, struct size frame_size) {
screen->frame_size = frame_size;
struct size window_size = get_initial_optimal_size(frame_size);
screen->window = SDL_CreateWindow(device_name, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
window_size.width, window_size.height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
if (!screen->window) {
SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not create window: %s", SDL_GetError());
return SDL_FALSE;
}
screen->renderer = SDL_CreateRenderer(screen->window, -1, SDL_RENDERER_ACCELERATED);
if (!screen->renderer) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create renderer: %s", SDL_GetError());
screen_destroy(screen);
return SDL_FALSE;
}
if (SDL_RenderSetLogicalSize(screen->renderer, frame_size.width, frame_size.height)) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Could not set renderer logical size: %s", SDL_GetError());
screen_destroy(screen);
return SDL_FALSE;
}
SDL_Surface *icon = read_xpm(icon_xpm);
if (!icon) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not load icon: %s", SDL_GetError());
screen_destroy(screen);
return SDL_FALSE;
}
SDL_SetWindowIcon(screen->window, icon);
SDL_FreeSurface(icon);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Initial texture: %" PRIu16 "x%" PRIu16, frame_size.width, frame_size.height);
screen->texture = SDL_CreateTexture(screen->renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING,
frame_size.width, frame_size.height);
if (!screen->texture) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create texture: %s", SDL_GetError());
screen_destroy(screen);
return SDL_FALSE;
}
screen_render(screen);
return SDL_TRUE;
}
void screen_destroy(struct screen *screen) {
if (screen->texture) {
SDL_DestroyTexture(screen->texture);
}
if (screen->renderer) {
// FIXME it may crash at exit if we destroy the renderer or the window,
// with the exact same stack trace as <https://bugs.launchpad.net/mir/+bug/1466535>.
// As a workaround, leak the renderer and the window (we are exiting anyway).
//SDL_DestroyRenderer(screen->renderer);
}
if (screen->window) {
//SDL_DestroyWindow(screen->window);
// at least we hide it
SDL_HideWindow(screen->window);
}
}
// recreate the texture and resize the window if the frame size has changed
static SDL_bool prepare_for_frame(struct screen *screen, struct size new_frame_size) {
if (screen->frame_size.width != new_frame_size.width || screen->frame_size.height != new_frame_size.height) {
if (SDL_RenderSetLogicalSize(screen->renderer, new_frame_size.width, new_frame_size.height)) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Could not set renderer logical size: %s", SDL_GetError());
return SDL_FALSE;
}
// frame dimension changed, destroy texture
SDL_DestroyTexture(screen->texture);
struct size current_size = get_window_size(screen);
struct size target_size = {
(Uint32) current_size.width * new_frame_size.width / screen->frame_size.width,
(Uint32) current_size.height * new_frame_size.height / screen->frame_size.height,
};
target_size = get_optimal_size(target_size, new_frame_size);
set_window_size(screen, target_size);
screen->frame_size = new_frame_size;
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "New texture: %" PRIu16 "x%" PRIu16,
screen->frame_size.width, screen->frame_size.height);
screen->texture = SDL_CreateTexture(screen->renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING,
new_frame_size.width, new_frame_size.height);
if (!screen->texture) {
SDL_LogCritical(SDL_LOG_CATEGORY_RENDER, "Could not create texture: %s", SDL_GetError());
return SDL_FALSE;
}
}
return SDL_TRUE;
}
// write the frame into the texture
static void update_texture(struct screen *screen, const AVFrame *frame) {
screen->texture_initialized = SDL_TRUE;
SDL_UpdateYUVTexture(screen->texture, NULL,
frame->data[0], frame->linesize[0],
frame->data[1], frame->linesize[1],
frame->data[2], frame->linesize[2]);
}
SDL_bool screen_update(struct screen *screen, const AVFrame *frame) {
struct size new_frame_size = {frame->width, frame->height};
if (!prepare_for_frame(screen, new_frame_size)) {
return SDL_FALSE;
}
update_texture(screen, frame);
return SDL_TRUE;
}
void screen_render(struct screen *screen) {
SDL_RenderClear(screen->renderer);
if (screen->texture_initialized) {
SDL_RenderCopy(screen->renderer, screen->texture, NULL, NULL);
}
SDL_RenderPresent(screen->renderer);
}
void screen_switch_fullscreen(struct screen *screen) {
if (!screen->fullscreen) {
// going to fullscreen, store the current windowed window size
screen->windowed_window_size = get_native_window_size(screen->window);
}
Uint32 new_mode = screen->fullscreen ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP;
if (SDL_SetWindowFullscreen(screen->window, new_mode)) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION, "Could not switch fullscreen mode: %s", SDL_GetError());
return;
}
screen->fullscreen = !screen->fullscreen;
if (!screen->fullscreen) {
// fullscreen disabled, restore expected windowed window size
SDL_SetWindowSize(screen->window, screen->windowed_window_size.width, screen->windowed_window_size.height);
}
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Switched to %s mode", screen->fullscreen ? "fullscreen" : "windowed");
screen_render(screen);
}
void screen_resize_to_fit(struct screen *screen) {
if (!screen->fullscreen) {
struct size optimal_size = get_optimal_window_size(screen, screen->frame_size);
SDL_SetWindowSize(screen->window, optimal_size.width, optimal_size.height);
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Resized to optimal size");
}
}
void screen_resize_to_pixel_perfect(struct screen *screen) {
if (!screen->fullscreen) {
SDL_SetWindowSize(screen->window, screen->frame_size.width, screen->frame_size.height);
SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION, "Resized to pixel-perfect");
}
}

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app/src/screen.h Normal file
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#ifndef SCREEN_H
#define SCREEN_H
#include <SDL2/SDL.h>
#include <libavformat/avformat.h>
#include "common.h"
struct screen {
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *texture;
struct size frame_size;
//used only in fullscreen mode to know the windowed window size
struct size windowed_window_size;
SDL_bool texture_initialized;
SDL_bool fullscreen;
};
#define SCREEN_INITIALIZER { \
.window = NULL, \
.renderer = NULL, \
.texture = NULL, \
.frame_size = { \
.width = 0, \
.height = 0, \
}, \
.windowed_window_size = { \
.width = 0, \
.height = 0, \
}, \
.texture_initialized = SDL_FALSE, \
.fullscreen = SDL_FALSE, \
}
// init SDL and set appropriate hints
SDL_bool sdl_init_and_configure(void);
// initialize default values
void screen_init(struct screen *screen);
// initialize screen, create window, renderer and texture
SDL_bool screen_init_rendering(struct screen *screen,
const char *device_name,
struct size frame_size);
// destroy window, renderer and texture (if any)
void screen_destroy(struct screen *screen);
// resize if necessary and write the frame into the texture
SDL_bool screen_update(struct screen *screen, const AVFrame *frame);
// 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);
#endif