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Fix touch events HiDPI-scaling

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Touch events were HiDPI-scaled twice:
 - once because the position (provided as floats between 0 and 1) were
   converted in pixels using the drawable size (not the window size)
 - once due to screen_convert_to_frame_coords()

One possible fix could be to compute the position in pixels from the
window size instead, but this would unnecessarily round the event
position to the nearest window coordinates (instead of drawable
coordinates).

Instead, expose two separate functions to convert to frame coordinates
from either window or drawable coordinates.

Fixes #1536 <https://github.com/Genymobile/scrcpy/issues/1536>
Refs #15 <https://github.com/Genymobile/scrcpy/issues/15>
Refs e40532a376
This commit is contained in:
Romain Vimont 2020-06-25 08:54:40 +02:00
parent 3c1ed5d86c
commit e8a565f9ea
3 changed files with 27 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
app/src/input_manager.c
View file

@ -434,7 +434,7 @@ convert_mouse_motion(const SDL_MouseMotionEvent *from, struct screen *screen,
to->inject_touch_event.pointer_id = POINTER_ID_MOUSE;
to->inject_touch_event.position.screen_size = screen->frame_size;
to->inject_touch_event.position.point =
screen_convert_to_frame_coords(screen, from->x, from->y);
screen_convert_window_to_frame_coords(screen, from->x, from->y);
to->inject_touch_event.pressure = 1.f;
to->inject_touch_event.buttons = convert_mouse_buttons(from->state);
@ -472,15 +472,15 @@ convert_touch(const SDL_TouchFingerEvent *from, struct screen *screen,
to->inject_touch_event.pointer_id = from->fingerId;
to->inject_touch_event.position.screen_size = screen->frame_size;
int ww;
int wh;
SDL_GL_GetDrawableSize(screen->window, &ww, &wh);
int dw;
int dh;
SDL_GL_GetDrawableSize(screen->window, &dw, &dh);
// SDL touch event coordinates are normalized in the range [0; 1]
int32_t x = from->x * ww;
int32_t y = from->y * wh;
int32_t x = from->x * dw;
int32_t y = from->y * dh;
to->inject_touch_event.position.point =
screen_convert_to_frame_coords(screen, x, y);
screen_convert_drawable_to_frame_coords(screen, x, y);
to->inject_touch_event.pressure = from->pressure;
to->inject_touch_event.buttons = 0;
@ -510,7 +510,7 @@ convert_mouse_button(const SDL_MouseButtonEvent *from, struct screen *screen,
to->inject_touch_event.pointer_id = POINTER_ID_MOUSE;
to->inject_touch_event.position.screen_size = screen->frame_size;
to->inject_touch_event.position.point =
screen_convert_to_frame_coords(screen, from->x, from->y);
screen_convert_window_to_frame_coords(screen, from->x, from->y);
to->inject_touch_event.pressure = 1.f;
to->inject_touch_event.buttons =
convert_mouse_buttons(SDL_BUTTON(from->button));
@ -575,7 +575,8 @@ convert_mouse_wheel(const SDL_MouseWheelEvent *from, struct screen *screen,
struct position position = {
.screen_size = screen->frame_size,
.point = screen_convert_to_frame_coords(screen, mouse_x, mouse_y),
.point = screen_convert_window_to_frame_coords(screen,
mouse_x, mouse_y),
};
to->type = CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT;

11
app/src/screen.c
View file

@ -580,14 +580,14 @@ screen_handle_window_event(struct screen *screen,
}
struct point
screen_convert_to_frame_coords(struct screen *screen, int32_t x, int32_t y) {
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;
screen_hidpi_scale_coords(screen, &x, &y);
x = (int64_t) (x - screen->rect.x) * w / screen->rect.w;
y = (int64_t) (y - screen->rect.y) * h / screen->rect.h;
@ -616,6 +616,13 @@ screen_convert_to_frame_coords(struct screen *screen, int32_t x, int32_t y) {
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

9
app/src/screen.h
View file

@ -124,7 +124,14 @@ screen_handle_window_event(struct screen *screen, const SDL_WindowEvent *event);
// convert point from window coordinates to frame coordinates
// x and y are expressed in pixels
struct point
screen_convert_to_frame_coords(struct screen *screen, int32_t x, int32_t y);
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