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[client] wayland: improve fractional scale handling

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Currently, we scale the desktop up to the next largest integer, and rely on
the wayland compositor to scale it back down to the correct size.
This is obviously undesirable.

In this commit, we attempt to detect the actual fractional scaling by finding
the current active mode in wl_output, and dividing it by the logical screen
size reported by xdg_output, taking into consideration screen rotation.

We then use wp_viewporter to set the exact buffer and viewport sizes if
fractional scaling is needed.
This commit is contained in:
Quantum
2021-07-31 21:56:47 -04:00
committed by Geoffrey McRae
parent 3baed05728
commit b3ca872cef
6 changed files with 152 additions and 19 deletions
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20
client/displayservers/Wayland/wayland.h
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@@ -40,11 +40,13 @@
#include "wayland-xdg-shell-client-protocol.h"
#include "wayland-presentation-time-client-protocol.h"
#include "wayland-viewporter-client-protocol.h"
#include "wayland-xdg-decoration-unstable-v1-client-protocol.h"
#include "wayland-keyboard-shortcuts-inhibit-unstable-v1-client-protocol.h"
#include "wayland-pointer-constraints-unstable-v1-client-protocol.h"
#include "wayland-relative-pointer-unstable-v1-client-protocol.h"
#include "wayland-idle-inhibit-unstable-v1-client-protocol.h"
#include "wayland-xdg-output-unstable-v1-client-protocol.h"
typedef void (*WaylandPollCallback)(uint32_t events, void * opaque);
@@ -60,8 +62,15 @@ struct WaylandPoll
struct WaylandOutput
{
uint32_t name;
int32_t scale;
wl_fixed_t scale;
int32_t scaleInt;
int32_t logicalWidth;
int32_t logicalHeight;
int32_t modeWidth;
int32_t modeHeight;
bool modeRotate;
struct wl_output * output;
struct zxdg_output_v1 * xdgOutput;
uint32_t version;
struct wl_list link;
};
@@ -93,7 +102,9 @@ struct WaylandDSState
struct wl_shm * shm;
struct wl_compositor * compositor;
int32_t width, height, scale;
int32_t width, height;
wl_fixed_t scale;
bool fractionalScale;
bool needsResize;
bool fullscreen;
uint32_t resizeSerial;
@@ -158,6 +169,9 @@ struct WaylandDSState
struct zwp_idle_inhibit_manager_v1 * idleInhibitManager;
struct zwp_idle_inhibitor_v1 * idleInhibitor;
struct wp_viewporter * viewporter;
struct wp_viewport * viewport;
struct zxdg_output_manager_v1 * xdgOutputManager;
struct wl_list outputs; // WaylandOutput::link
struct wl_list surfaceOutputs; // SurfaceOutput::link
@@ -259,7 +273,7 @@ bool waylandOutputInit(void);
void waylandOutputFree(void);
void waylandOutputBind(uint32_t name, uint32_t version);
void waylandOutputTryUnbind(uint32_t name);
int32_t waylandOutputGetScale(struct wl_output * output);
wl_fixed_t waylandOutputGetScale(struct wl_output * output);
// poll module
bool waylandPollInit(void);