3rdparty/ext_qt/0023-Implement-a-switch-for-tablet-API-on-Windows.patch

0001 From 69df067982434797a0152fc74d5171eeccd41601 Mon Sep 17 00:00:00 2001
0002 From: Dmitry Kazakov <dimula73@gmail.com>
0003 Date: Wed, 3 Apr 2019 18:37:56 +0300
0004 Subject: [PATCH 04/47] Implement a switch for tablet API on Windows
0005
0006 Qt has support for two tablet APIs: WinTab and Windows Pointer API.
0007 The former one is used in professional graphical tablet devices,
0008 like Wacom, Huion and etc. The latter is mostly used in two-in-one
0009 convertible laptops, like Surface Pro. By default Qt prefers Windows
0010 Pointer API, if it is available.
0011
0012 The problem is that some devices (e.g. Huion tablets) do not
0013 support Windows Pointer API. More than that, even devices, which
0014 support Pointer API, must limit their capabilities to fit it:
0015
0016 1) Winodws Pointer API doesn't support more than one stylus barrel
0017    buttons, but all professional devices have at least two buttons.
0018
0019 2) Winodws Pointer API limits pressure resolution to 1024 levels,
0020    but even entry-level Wacom devices have at least 2048 levels.
0021    Professional-level devices have 4096 levels.
0022
0023 Therefore painting applications should be able to choose, which API
0024 they prefer.
0025
0026 This patch implements a special application attribute
0027 Qt::AA_MSWindowsUseWinTabAPI. Application should set it before creation
0028 of QApplication to force selection of WinTab API.
0029
0030 When running, application can check currently running API by
0031 testing this attribute.
0032 ---
0033  src/corelib/global/qnamespace.h                       | 1 +
0034  src/plugins/platforms/windows/qwindowsintegration.cpp | 8 +++++++-
0035  2 files changed, 8 insertions(+), 1 deletion(-)
0036
0037 diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
0038 index dec2c44637..3ab9921986 100644
0039 --- a/src/corelib/global/qnamespace.h
0040 +++ b/src/corelib/global/qnamespace.h
0041 @@ -525,6 +525,7 @@ public:
0042          AA_DontShowShortcutsInContextMenus = 28,
0043          AA_CompressTabletEvents = 29,
0044          AA_DisableWindowContextHelpButton = 30, // ### Qt 6: remove me
0045 +        AA_MSWindowsUseWinTabAPI = 31, // Win only
0046
0047          // Add new attributes before this line
0048          AA_AttributeCount
0049 diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
0050 index 5c1fa00088..d2d12ff7e5 100644
0051 --- a/src/plugins/platforms/windows/qwindowsintegration.cpp
0052 +++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
0053 @@ -236,10 +236,16 @@ QWindowsIntegrationPrivate::QWindowsIntegrationPrivate(const QStringList &paramL
0054      m_options = parseOptions(paramList, &tabletAbsoluteRange, &dpiAwareness);
0055      QWindowsFontDatabase::setFontOptions(m_options);
0056
0057 +    if (QCoreApplication::testAttribute(Qt::AA_MSWindowsUseWinTabAPI)) {
0058 +        m_options |= QWindowsIntegration::DontUseWMPointer;
0059 +    }
0060 +
0061      if (m_context.initPointer(m_options)) {
0062          QCoreApplication::setAttribute(Qt::AA_CompressHighFrequencyEvents);
0063      } else {
0064 -        m_context.initTablet(m_options);
0065 +        if (m_context.initTablet(m_options))
0066 +            QCoreApplication::setAttribute(Qt::AA_MSWindowsUseWinTabAPI);
0067 +
0068          if (tabletAbsoluteRange >= 0)
0069              m_context.setTabletAbsoluteRange(tabletAbsoluteRange);
0070      }
0071 --
0072 2.20.1.windows.1
0073