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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
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9
app/src/screen.h
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@@ -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