maxmustermann
/
scrcpy
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
scrcpy/app/src/screen.c

824 lines
26 KiB
C
Raw Blame History

#include "screen.h"
#include <assert.h>
#include <string.h>
#include <SDL2/SDL.h>
#include "events.h"
#include "icon.h"
#include "scrcpy.h"
#include "video_buffer.h"
#include "util/log.h"
#define DISPLAY_MARGINS 96
#define DOWNCAST(SINK) container_of(SINK, struct screen, frame_sink)
static inline struct size
get_rotated_size(struct size size, int rotation) {
struct size rotated_size;
if (rotation & 1) {
rotated_size.width = size.height;
rotated_size.height = size.width;
} else {
rotated_size.width = size.width;
rotated_size.height = size.height;
}
return rotated_size;
}
// get the window size in a struct size
static struct size
get_window_size(const struct screen *screen) {
int width;
int height;
SDL_GetWindowSize(screen->window, &width, &height);
struct size size;
size.width = width;
size.height = height;
return size;
}
static struct point
get_window_position(const struct screen *screen) {
int x;
int y;
SDL_GetWindowPosition(screen->window, &x, &y);
struct point point;
point.x = x;
point.y = y;
return point;
}
// set the window size to be applied when fullscreen is disabled
static void
set_window_size(struct screen *screen, struct size new_size) {
assert(!screen->fullscreen);
assert(!screen->maximized);
SDL_SetWindowSize(screen->window, new_size.width, new_size.height);
}
// get the preferred display bounds (i.e. the screen bounds with some margins)
static bool
get_preferred_display_bounds(struct size *bounds) {
SDL_Rect rect;
#ifdef SCRCPY_SDL_HAS_GET_DISPLAY_USABLE_BOUNDS
# 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)) {
LOGW("Could not get display usable bounds: %s", SDL_GetError());
return false;
}
bounds->width = MAX(0, rect.w - DISPLAY_MARGINS);
bounds->height = MAX(0, rect.h - DISPLAY_MARGINS);
return true;
}
static bool
is_optimal_size(struct size current_size, struct size content_size) {
// The size is optimal if we can recompute one dimension of the current
// size from the other
return current_size.height == current_size.width * content_size.height
/ content_size.width
|| current_size.width == current_size.height * content_size.width
/ content_size.height;
}
// 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 content_size) {
if (content_size.width == 0 || content_size.height == 0) {
// avoid division by 0
return current_size;
}
struct size window_size;
struct size display_size;
if (!get_preferred_display_bounds(&display_size)) {
// could not get display bounds, do not constraint the size
window_size.width = current_size.width;
window_size.height = current_size.height;
} else {
window_size.width = MIN(current_size.width, display_size.width);
window_size.height = MIN(current_size.height, display_size.height);
}
if (is_optimal_size(window_size, content_size)) {
return window_size;
}
bool keep_width = content_size.width * window_size.height
> content_size.height * window_size.width;
if (keep_width) {
// remove black borders on top and bottom
window_size.height = content_size.height * window_size.width
/ content_size.width;
} else {
// remove black borders on left and right (or none at all if it already
// fits)
window_size.width = content_size.width * window_size.height
/ content_size.height;
}
return window_size;
}
// initially, there is no current size, so use the frame size as current size
// req_width and req_height, if not 0, are the sizes requested by the user
static inline struct size
get_initial_optimal_size(struct size content_size, uint16_t req_width,
uint16_t req_height) {
struct size window_size;
if (!req_width && !req_height) {
window_size = get_optimal_size(content_size, content_size);
} else {
if (req_width) {
window_size.width = req_width;
} else {
// compute from the requested height
window_size.width = (uint32_t) req_height * content_size.width
/ content_size.height;
}
if (req_height) {
window_size.height = req_height;
} else {
// compute from the requested width
window_size.height = (uint32_t) req_width * content_size.height
/ content_size.width;
}
}
return window_size;
}
static void
screen_update_content_rect(struct screen *screen) {
int dw;
int dh;
SDL_GL_GetDrawableSize(screen->window, &dw, &dh);
struct size content_size = screen->content_size;
// The drawable size is the window size * the HiDPI scale
struct size drawable_size = {dw, dh};
SDL_Rect *rect = &screen->rect;
if (is_optimal_size(drawable_size, content_size)) {
rect->x = 0;
rect->y = 0;
rect->w = drawable_size.width;
rect->h = drawable_size.height;
return;
}
bool keep_width = content_size.width * drawable_size.height
> content_size.height * drawable_size.width;
if (keep_width) {
rect->x = 0;
rect->w = drawable_size.width;
rect->h = drawable_size.width * content_size.height
/ content_size.width;
rect->y = (drawable_size.height - rect->h) / 2;
} else {
rect->y = 0;
rect->h = drawable_size.height;
rect->w = drawable_size.height * content_size.width
/ content_size.height;
rect->x = (drawable_size.width - rect->w) / 2;
}
}
static inline SDL_Texture *
create_texture(struct screen *screen) {
SDL_Renderer *renderer = screen->renderer;
struct size size = screen->frame_size;
SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YV12,
SDL_TEXTUREACCESS_STREAMING,
size.width, size.height);
if (!texture) {
return NULL;
}
if (screen->mipmaps) {
struct sc_opengl *gl = &screen->gl;
SDL_GL_BindTexture(texture, NULL, NULL);
// Enable trilinear filtering for downscaling
gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
gl->TexParameterf(GL_TEXTURE_2D, GL_TEXTURE_LOD_BIAS, -1.f);
SDL_GL_UnbindTexture(texture);
}
return texture;
}
#if defined(__APPLE__) || defined(__WINDOWS__)
# define CONTINUOUS_RESIZING_WORKAROUND
#endif
#ifdef CONTINUOUS_RESIZING_WORKAROUND
// On Windows and MacOS, resizing blocks the event loop, so resizing events are
// not triggered. As a workaround, handle them in an event handler.
//
// <https://bugzilla.libsdl.org/show_bug.cgi?id=2077>
// <https://stackoverflow.com/a/40693139/1987178>
static int
event_watcher(void *data, SDL_Event *event) {
struct screen *screen = data;
if (event->type == SDL_WINDOWEVENT
&& event->window.event == SDL_WINDOWEVENT_RESIZED) {
// In practice, it seems to always be called from the same thread in
// that specific case. Anyway, it's just a workaround.
screen_render(screen, true);
}
return 0;
}
#endif
static bool
screen_frame_sink_open(struct sc_frame_sink *sink) {
struct screen *screen = DOWNCAST(sink);
(void) screen;
#ifndef NDEBUG
screen->open = true;
#endif
// nothing to do, the screen is already open on the main thread
return true;
}
static void
screen_frame_sink_close(struct sc_frame_sink *sink) {
struct screen *screen = DOWNCAST(sink);
(void) screen;
#ifndef NDEBUG
screen->open = false;
#endif
// nothing to do, the screen lifecycle is not managed by the frame producer
}
static bool
screen_frame_sink_push(struct sc_frame_sink *sink, const AVFrame *frame) {
struct screen *screen = DOWNCAST(sink);
return sc_video_buffer_push(&screen->vb, frame);
}
static void
sc_video_buffer_on_new_frame(struct sc_video_buffer *vb, bool previous_skipped,
void *userdata) {
(void) vb;
struct screen *screen = userdata;
if (previous_skipped) {
fps_counter_add_skipped_frame(&screen->fps_counter);
// The EVENT_NEW_FRAME triggered for the previous frame will consume
// this new frame instead
} else {
static SDL_Event new_frame_event = {
.type = EVENT_NEW_FRAME,
};
// Post the event on the UI thread
SDL_PushEvent(&new_frame_event);
}
}
bool
screen_init(struct screen *screen, const struct screen_params *params) {
screen->resize_pending = false;
screen->has_frame = false;
screen->fullscreen = false;
screen->maximized = false;
static const struct sc_video_buffer_callbacks cbs = {
.on_new_frame = sc_video_buffer_on_new_frame,
};
bool ok = sc_video_buffer_init(&screen->vb, params->buffering_time, &cbs,
screen);
if (!ok) {
LOGE("Could not initialize video buffer");
return false;
}
ok = sc_video_buffer_start(&screen->vb);
if (!ok) {
LOGE("Could not start video_buffer");
goto error_destroy_video_buffer;
}
if (!fps_counter_init(&screen->fps_counter)) {
LOGE("Could not initialize FPS counter");
goto error_stop_and_join_video_buffer;
}
screen->frame_size = params->frame_size;
screen->rotation = params->rotation;
if (screen->rotation) {
LOGI("Initial display rotation set to %u", screen->rotation);
}
struct size content_size =
get_rotated_size(screen->frame_size, screen->rotation);
screen->content_size = content_size;
struct size window_size = get_initial_optimal_size(content_size,
params->window_width,
params->window_height);
uint32_t window_flags = SDL_WINDOW_HIDDEN
| SDL_WINDOW_RESIZABLE
| SDL_WINDOW_ALLOW_HIGHDPI;
if (params->always_on_top) {
#ifdef SCRCPY_SDL_HAS_WINDOW_ALWAYS_ON_TOP
window_flags |= SDL_WINDOW_ALWAYS_ON_TOP;
#else
LOGW("The 'always on top' flag is not available "
"(compile with SDL >= 2.0.5 to enable it)");
#endif
}
if (params->window_borderless) {
window_flags |= SDL_WINDOW_BORDERLESS;
}
int x = params->window_x != SC_WINDOW_POSITION_UNDEFINED
? params->window_x : (int) SDL_WINDOWPOS_UNDEFINED;
int y = params->window_y != SC_WINDOW_POSITION_UNDEFINED
? params->window_y : (int) SDL_WINDOWPOS_UNDEFINED;
screen->window = SDL_CreateWindow(params->window_title, x, y,
window_size.width, window_size.height,
window_flags);
if (!screen->window) {
LOGC("Could not create window: %s", SDL_GetError());
goto error_destroy_fps_counter;
}
screen->renderer = SDL_CreateRenderer(screen->window, -1,
SDL_RENDERER_ACCELERATED);
if (!screen->renderer) {
LOGC("Could not create renderer: %s", SDL_GetError());
goto error_destroy_window;
}
SDL_RendererInfo renderer_info;
int r = SDL_GetRendererInfo(screen->renderer, &renderer_info);
const char *renderer_name = r ? NULL : renderer_info.name;
LOGI("Renderer: %s", renderer_name ? renderer_name : "(unknown)");
screen->mipmaps = false;
// starts with "opengl"
bool use_opengl = renderer_name && !strncmp(renderer_name, "opengl", 6);
if (use_opengl) {
struct sc_opengl *gl = &screen->gl;
sc_opengl_init(gl);
LOGI("OpenGL version: %s", gl->version);
if (params->mipmaps) {
bool supports_mipmaps =
sc_opengl_version_at_least(gl, 3, 0, /* OpenGL 3.0+ */
2, 0 /* OpenGL ES 2.0+ */);
if (supports_mipmaps) {
LOGI("Trilinear filtering enabled");
screen->mipmaps = true;
} else {
LOGW("Trilinear filtering disabled "
"(OpenGL 3.0+ or ES 2.0+ required)");
}
} else {
LOGI("Trilinear filtering disabled");
}
} else if (params->mipmaps) {
LOGD("Trilinear filtering disabled (not an OpenGL renderer)");
}
SDL_Surface *icon = scrcpy_icon_load();
if (icon) {
SDL_SetWindowIcon(screen->window, icon);
scrcpy_icon_destroy(icon);
} else {
LOGW("Could not load icon");
}
LOGI("Initial texture: %" PRIu16 "x%" PRIu16, params->frame_size.width,
params->frame_size.height);
screen->texture = create_texture(screen);
if (!screen->texture) {
LOGC("Could not create texture: %s", SDL_GetError());
goto error_destroy_renderer;
}
screen->frame = av_frame_alloc();
if (!screen->frame) {
LOGC("Could not create screen frame");
goto error_destroy_texture;
}
// Reset the window size to trigger a SIZE_CHANGED event, to workaround
// HiDPI issues with some SDL renderers when several displays having
// different HiDPI scaling are connected
SDL_SetWindowSize(screen->window, window_size.width, window_size.height);
screen_update_content_rect(screen);
if (params->fullscreen) {
screen_switch_fullscreen(screen);
}
#ifdef CONTINUOUS_RESIZING_WORKAROUND
SDL_AddEventWatch(event_watcher, screen);
#endif
static const struct sc_frame_sink_ops ops = {
.open = screen_frame_sink_open,
.close = screen_frame_sink_close,
.push = screen_frame_sink_push,
};
screen->frame_sink.ops = &ops;
#ifndef NDEBUG
screen->open = false;
#endif
return true;
error_destroy_texture:
SDL_DestroyTexture(screen->texture);
error_destroy_renderer:
SDL_DestroyRenderer(screen->renderer);
error_destroy_window:
SDL_DestroyWindow(screen->window);
error_destroy_fps_counter:
fps_counter_destroy(&screen->fps_counter);
error_stop_and_join_video_buffer:
sc_video_buffer_stop(&screen->vb);
sc_video_buffer_join(&screen->vb);
error_destroy_video_buffer:
sc_video_buffer_destroy(&screen->vb);
return false;
}
static void
screen_show_window(struct screen *screen) {
SDL_ShowWindow(screen->window);
}
void
screen_hide_window(struct screen *screen) {
SDL_HideWindow(screen->window);
}
void
screen_interrupt(struct screen *screen) {
sc_video_buffer_stop(&screen->vb);
fps_counter_interrupt(&screen->fps_counter);
}
void
screen_join(struct screen *screen) {
sc_video_buffer_join(&screen->vb);
fps_counter_join(&screen->fps_counter);
}
void
screen_destroy(struct screen *screen) {
#ifndef NDEBUG
assert(!screen->open);
#endif
av_frame_free(&screen->frame);
SDL_DestroyTexture(screen->texture);
SDL_DestroyRenderer(screen->renderer);
SDL_DestroyWindow(screen->window);
fps_counter_destroy(&screen->fps_counter);
sc_video_buffer_destroy(&screen->vb);
}
static void
resize_for_content(struct screen *screen, struct size old_content_size,
struct size new_content_size) {
struct size window_size = get_window_size(screen);
struct size target_size = {
.width = (uint32_t) window_size.width * new_content_size.width
/ old_content_size.width,
.height = (uint32_t) window_size.height * new_content_size.height
/ old_content_size.height,
};
target_size = get_optimal_size(target_size, new_content_size);
set_window_size(screen, target_size);
}
static void
set_content_size(struct screen *screen, struct size new_content_size) {
if (!screen->fullscreen && !screen->maximized) {
resize_for_content(screen, screen->content_size, new_content_size);
} else if (!screen->resize_pending) {
// Store the windowed size to be able to compute the optimal size once
// fullscreen and maximized are disabled
screen->windowed_content_size = screen->content_size;
screen->resize_pending = true;
}
screen->content_size = new_content_size;
}
static void
apply_pending_resize(struct screen *screen) {
assert(!screen->fullscreen);
assert(!screen->maximized);
if (screen->resize_pending) {
resize_for_content(screen, screen->windowed_content_size,
screen->content_size);
screen->resize_pending = false;
}
}
void
screen_set_rotation(struct screen *screen, unsigned rotation) {
assert(rotation < 4);
if (rotation == screen->rotation) {
return;
}
struct size new_content_size =
get_rotated_size(screen->frame_size, rotation);
set_content_size(screen, new_content_size);
screen->rotation = rotation;
LOGI("Display rotation set to %u", rotation);
screen_render(screen, true);
}
// recreate the texture and resize the window if the frame size has changed
static 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) {
// frame dimension changed, destroy texture
SDL_DestroyTexture(screen->texture);
screen->frame_size = new_frame_size;
struct size new_content_size =
get_rotated_size(new_frame_size, screen->rotation);
set_content_size(screen, new_content_size);
screen_update_content_rect(screen);
LOGI("New texture: %" PRIu16 "x%" PRIu16,
screen->frame_size.width, screen->frame_size.height);
screen->texture = create_texture(screen);
if (!screen->texture) {
LOGC("Could not create texture: %s", SDL_GetError());
return false;
}
}
return true;
}
// write the frame into the texture
static void
update_texture(struct screen *screen, const AVFrame *frame) {
SDL_UpdateYUVTexture(screen->texture, NULL,
frame->data[0], frame->linesize[0],
frame->data[1], frame->linesize[1],
frame->data[2], frame->linesize[2]);
if (screen->mipmaps) {
SDL_GL_BindTexture(screen->texture, NULL, NULL);
screen->gl.GenerateMipmap(GL_TEXTURE_2D);
SDL_GL_UnbindTexture(screen->texture);
}
}
static bool
screen_update_frame(struct screen *screen) {
av_frame_unref(screen->frame);
sc_video_buffer_consume(&screen->vb, screen->frame);
AVFrame *frame = screen->frame;
fps_counter_add_rendered_frame(&screen->fps_counter);
struct size new_frame_size = {frame->width, frame->height};
if (!prepare_for_frame(screen, new_frame_size)) {
return false;
}
update_texture(screen, frame);
screen_render(screen, false);
return true;
}
void
screen_render(struct screen *screen, bool update_content_rect) {
if (update_content_rect) {
screen_update_content_rect(screen);
}
SDL_RenderClear(screen->renderer);
if (screen->rotation == 0) {
SDL_RenderCopy(screen->renderer, screen->texture, NULL, &screen->rect);
} else {
// rotation in RenderCopyEx() is clockwise, while screen->rotation is
// counterclockwise (to be consistent with --lock-video-orientation)
int cw_rotation = (4 - screen->rotation) % 4;
double angle = 90 * cw_rotation;
SDL_Rect *dstrect = NULL;
SDL_Rect rect;
if (screen->rotation & 1) {
rect.x = screen->rect.x + (screen->rect.w - screen->rect.h) / 2;
rect.y = screen->rect.y + (screen->rect.h - screen->rect.w) / 2;
rect.w = screen->rect.h;
rect.h = screen->rect.w;
dstrect = &rect;
} else {
assert(screen->rotation == 2);
dstrect = &screen->rect;
}
SDL_RenderCopyEx(screen->renderer, screen->texture, NULL, dstrect,
angle, NULL, 0);
}
SDL_RenderPresent(screen->renderer);
}
void
screen_switch_fullscreen(struct screen *screen) {
uint32_t new_mode = screen->fullscreen ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP;
if (SDL_SetWindowFullscreen(screen->window, new_mode)) {
LOGW("Could not switch fullscreen mode: %s", SDL_GetError());
return;
}
screen->fullscreen = !screen->fullscreen;
if (!screen->fullscreen && !screen->maximized) {
apply_pending_resize(screen);
}
LOGD("Switched to %s mode", screen->fullscreen ? "fullscreen" : "windowed");
screen_render(screen, true);
}
void
screen_resize_to_fit(struct screen *screen) {
if (screen->fullscreen || screen->maximized) {
return;
}
struct point point = get_window_position(screen);
struct size window_size = get_window_size(screen);
struct size optimal_size =
get_optimal_size(window_size, screen->content_size);
// Center the window related to the device screen
assert(optimal_size.width <= window_size.width);
assert(optimal_size.height <= window_size.height);
uint32_t new_x = point.x + (window_size.width - optimal_size.width) / 2;
uint32_t new_y = point.y + (window_size.height - optimal_size.height) / 2;
SDL_SetWindowSize(screen->window, optimal_size.width, optimal_size.height);
SDL_SetWindowPosition(screen->window, new_x, new_y);
LOGD("Resized to optimal size: %ux%u", optimal_size.width,
optimal_size.height);
}
void
screen_resize_to_pixel_perfect(struct screen *screen) {
if (screen->fullscreen) {
return;
}
if (screen->maximized) {
SDL_RestoreWindow(screen->window);
screen->maximized = false;
}
struct size content_size = screen->content_size;
SDL_SetWindowSize(screen->window, content_size.width, content_size.height);
LOGD("Resized to pixel-perfect: %ux%u", content_size.width,
content_size.height);
}
bool
screen_handle_event(struct screen *screen, SDL_Event *event) {
switch (event->type) {
case EVENT_NEW_FRAME:
if (!screen->has_frame) {
screen->has_frame = true;
// this is the very first frame, show the window
screen_show_window(screen);
}
bool ok = screen_update_frame(screen);
if (!ok) {
LOGW("Frame update failed\n");
}
return true;
case SDL_WINDOWEVENT:
if (!screen->has_frame) {
// Do nothing
return true;
}
switch (event->window.event) {
case SDL_WINDOWEVENT_EXPOSED:
screen_render(screen, true);
break;
case SDL_WINDOWEVENT_SIZE_CHANGED:
screen_render(screen, true);
break;
case SDL_WINDOWEVENT_MAXIMIZED:
screen->maximized = true;
break;
case SDL_WINDOWEVENT_RESTORED:
if (screen->fullscreen) {
// On Windows, in maximized+fullscreen, disabling
// fullscreen mode unexpectedly triggers the "restored"
// then "maximized" events, leaving the window in a
// weird state (maximized according to the events, but
// not maximized visually).
break;
}
screen->maximized = false;
apply_pending_resize(screen);
screen_render(screen, true);
break;
}
return true;
}
return false;
}
struct point
screen_convert_drawable_to_frame_coords(struct screen *screen,
int32_t x, int32_t y) {
unsigned rotation = screen->rotation;
assert(rotation < 4);
int32_t w = screen->content_size.width;
int32_t h = screen->content_size.height;
x = (int64_t) (x - screen->rect.x) * w / screen->rect.w;
y = (int64_t) (y - screen->rect.y) * h / screen->rect.h;
// rotate
struct point result;
switch (rotation) {
case 0:
result.x = x;
result.y = y;
break;
case 1:
result.x = h - y;
result.y = x;
break;
case 2:
result.x = w - x;
result.y = h - y;
break;
default:
assert(rotation == 3);
result.x = y;
result.y = w - x;
break;
}
return result;
}
struct point
screen_convert_window_to_frame_coords(struct screen *screen,
int32_t x, int32_t y) {
screen_hidpi_scale_coords(screen, &x, &y);
return screen_convert_drawable_to_frame_coords(screen, x, y);
}
void
screen_hidpi_scale_coords(struct screen *screen, int32_t *x, int32_t *y) {
// take the HiDPI scaling (dw/ww and dh/wh) into account
int ww, wh, dw, dh;
SDL_GetWindowSize(screen->window, &ww, &wh);
SDL_GL_GetDrawableSize(screen->window, &dw, &dh);
// scale for HiDPI (64 bits for intermediate multiplications)
*x = (int64_t) *x * dw / ww;
*y = (int64_t) *y * dh / wh;
}
Reference in New Issue View Git Blame Copy Permalink