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UI: Support fractional scaling 

On Linux the preview widget scaling uses only the integer part of the
scale. This results in a partially non-repainting window that looks
buggy and annoying.
master
rkfg 2018-12-16 14:14:42 +03:00
parent 6d8f2f4f93
commit 4e9e692a69
2 changed files with 23 additions and 0 deletions
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8
UI/display-helpers.hpp
View File

@ -17,6 +17,10 @@
#pragma once
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
#define SUPPORTS_FRACTIONAL_SCALING
#endif
static inline void GetScaleAndCenterPos(
int baseCX, int baseCY, int windowCX, int windowCY,
int &x, int &y, float &scale)
@ -51,5 +55,9 @@ static inline void GetCenterPosFromFixedScale(
static inline QSize GetPixelSize(QWidget *widget)
{
#ifdef SUPPORTS_FRACTIONAL_SCALING
return widget->size() * widget->devicePixelRatioF();
#else
return widget->size() * widget->devicePixelRatio();
#endif
}

15
UI/window-basic-preview.cpp
View File

@ -11,6 +11,9 @@
#define HANDLE_RADIUS 4.0f
#define HANDLE_SEL_RADIUS (HANDLE_RADIUS * 1.5f)
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
#define SUPPORTS_FRACTIONAL_SCALING
#endif
/* TODO: make C++ math classes and clean up code here later */
@ -24,7 +27,11 @@ OBSBasicPreview::OBSBasicPreview(QWidget *parent, Qt::WindowFlags flags)
vec2 OBSBasicPreview::GetMouseEventPos(QMouseEvent *event)
{
OBSBasic *main = reinterpret_cast<OBSBasic*>(App()->GetMainWindow());
#ifdef SUPPORTS_FRACTIONAL_SCALING
float pixelRatio = main->devicePixelRatioF();
#else
float pixelRatio = main->devicePixelRatio();
#endif
float scale = pixelRatio / main->previewScale;
vec2 pos;
vec2_set(&pos,
@ -369,7 +376,11 @@ void OBSBasicPreview::GetStretchHandleData(const vec2 &pos)
if (!scene)
return;
#ifdef SUPPORTS_FRACTIONAL_SCALING
float scale = main->previewScale / main->devicePixelRatioF();
#else
float scale = main->previewScale / main->devicePixelRatio();
#endif
vec2 scaled_pos = pos;
vec2_divf(&scaled_pos, &scaled_pos, scale);
HandleFindData data(scaled_pos, scale);
@ -491,7 +502,11 @@ void OBSBasicPreview::mousePressEvent(QMouseEvent *event)
}
OBSBasic *main = reinterpret_cast<OBSBasic*>(App()->GetMainWindow());
#ifdef SUPPORTS_FRACTIONAL_SCALING
float pixelRatio = main->devicePixelRatioF();
#else
float pixelRatio = main->devicePixelRatio();
#endif
float x = float(event->x()) - main->previewX / pixelRatio;
float y = float(event->y()) - main->previewY / pixelRatio;
Qt::KeyboardModifiers modifiers = QGuiApplication::keyboardModifiers();