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wayland: make resizing better 

Resizing the window while preserving the aspect ratio actually kind of
sucked. The window size could make big dramatic changes which was pretty
unintuitive with respect to where the mouse was actually located.
Instead, let's just do some math to ensure that the window size is
always contained inside the width/height reported by
handle_toplevel_config while preserving the aspect ratio. Fixes #7426.
This commit is contained in:
Dudemanguy 2020-02-12 12:26:24 -06:00
parent cc52a03401
commit 83efdb5a01
2 changed files with 32 additions and 6 deletions
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34
video/out/wayland_common.c
View File

@ -995,10 +995,13 @@ static void handle_toplevel_config(void *data, struct xdg_toplevel *toplevel,
if (width > 0 && height > 0) {
if (!is_fullscreen && !is_maximized) {
if (wl->vo_opts->keepaspect && wl->vo_opts->keepaspect_window) {
if (width > height)
width = height * wl->aspect_ratio;
else
height = width / wl->aspect_ratio;
if (abs(wl->toplevel_width - old_toplevel_width) > abs(wl->toplevel_height - old_toplevel_height)) {
double scale_factor = (double)width / wl->reduced_width;
width = wl->reduced_width * scale_factor;
} else {
double scale_factor = (double)height / wl->reduced_height;
height = wl->reduced_height * scale_factor;
}
}
wl->window_size.x0 = 0;
wl->window_size.y0 = 0;
@ -1270,6 +1273,25 @@ static struct vo_wayland_output *find_output(struct vo_wayland_state *wl, int in
return NULL;
}
static void greatest_common_divisor(struct vo_wayland_state *wl, int a, int b) {
// euclidean algorithm
int larger;
int smaller;
if (a > b) {
larger = a;
smaller = b;
} else {
larger = b;
smaller = a;
}
int remainder = larger - smaller * floor(larger/smaller);
if (remainder == 0) {
wl->gcd = smaller;
} else {
greatest_common_divisor(wl, smaller, remainder);
}
}
int vo_wayland_reconfig(struct vo *vo)
{
struct vo_wayland_state *wl = vo->wl;
@ -1309,7 +1331,9 @@ int vo_wayland_reconfig(struct vo *vo)
wl->window_size = wl->geometry;
}
wl->aspect_ratio = vo->dwidth / (float)vo->dheight;
greatest_common_divisor(wl, vo->dwidth, vo->dheight);
wl->reduced_width = vo->dwidth / wl->gcd;
wl->reduced_height = vo->dheight / wl->gcd;
if (wl->vo_opts->fullscreen) {
/* If already fullscreen, fix resolution for the frame size change */

4
video/out/wayland_common.h
View File

@ -70,7 +70,9 @@ struct vo_wayland_state {
/* State */
struct mp_rect geometry;
struct mp_rect window_size;
float aspect_ratio;
int gcd;
int reduced_width;
int reduced_height;
bool configured;
bool frame_wait;
bool hidden;