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Windows: Scale pixmap/bitmap cursors when High DPI scaling is active.

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Apply a per screen scale factor, also taking the device pixel
ratios of the pixmaps into account.

Task-number: QTBUG-49511
Change-Id: If46b6eeb37635c2c4046992c1ba06711ccf54eae
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
This commit is contained in:
Friedemann Kleint 2015-11-19 13:32:25 +01:00
parent f39db6c3f8
commit 36bb6d266e
2 changed files with 23 additions and 7 deletions
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26
src/plugins/platforms/windows/qwindowscursor.cpp
View File

@ -43,6 +43,7 @@
#include <QtGui/QGuiApplication>
#include <QtGui/QScreen>
#include <QtGui/private/qguiapplication_p.h> // getPixmapCursor()
#include <QtGui/private/qhighdpiscaling_p.h>
#include <QtCore/QDebug>
#include <QtCore/QScopedArrayPointer>
@ -93,9 +94,14 @@ QWindowsPixmapCursorCacheKey::QWindowsPixmapCursorCacheKey(const QCursor &c)
\sa QWindowsWindowCursor
*/
HCURSOR QWindowsCursor::createPixmapCursor(const QPixmap &pixmap, const QPoint &hotSpot)
HCURSOR QWindowsCursor::createPixmapCursor(QPixmap pixmap, const QPoint &hotSpot, qreal scaleFactor)
{
HCURSOR cur = 0;
scaleFactor /= pixmap.devicePixelRatioF();
if (!qFuzzyCompare(scaleFactor, 1)) {
pixmap = pixmap.scaled((scaleFactor * QSizeF(pixmap.size())).toSize(),
Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
QBitmap mask = pixmap.mask();
if (mask.isNull()) {
mask = QBitmap(pixmap.size());
@ -203,11 +209,19 @@ static HCURSOR createBitmapCursor(const QImage &bbits, const QImage &mbits,
}
// Create a cursor from image and mask of the format QImage::Format_Mono.
static HCURSOR createBitmapCursor(const QCursor &cursor)
static HCURSOR createBitmapCursor(const QCursor &cursor, qreal scaleFactor = 1)
{
Q_ASSERT(cursor.shape() == Qt::BitmapCursor && cursor.bitmap());
const QImage bbits = cursor.bitmap()->toImage().convertToFormat(QImage::Format_Mono);
const QImage mbits = cursor.mask()->toImage().convertToFormat(QImage::Format_Mono);
QImage bbits = cursor.bitmap()->toImage();
QImage mbits = cursor.mask()->toImage();
scaleFactor /= bbits.devicePixelRatioF();
if (!qFuzzyCompare(scaleFactor, 1)) {
const QSize scaledSize = (QSizeF(bbits.size()) * scaleFactor).toSize();
bbits = bbits.scaled(scaledSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
mbits = mbits.scaled(scaledSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
bbits = bbits.convertToFormat(QImage::Format_Mono);
mbits = mbits.convertToFormat(QImage::Format_Mono);
const bool invb = bbits.colorCount() > 1 && qGray(bbits.color(0)) < qGray(bbits.color(1));
const bool invm = mbits.colorCount() > 1 && qGray(mbits.color(0)) < qGray(mbits.color(1));
return createBitmapCursor(bbits, mbits, cursor.hotSpot(), invb, invm);
@ -583,9 +597,11 @@ CursorHandlePtr QWindowsCursor::pixmapWindowCursor(const QCursor &c)
++it;
}
}
const qreal scaleFactor = QHighDpiScaling::factor(m_screen);
const QPixmap pixmap = c.pixmap();
const HCURSOR hc = pixmap.isNull()
? createBitmapCursor(c) : QWindowsCursor::createPixmapCursor(pixmap, c.hotSpot());
? createBitmapCursor(c, scaleFactor)
: QWindowsCursor::createPixmapCursor(pixmap, c.hotSpot(), scaleFactor);
it = m_pixmapCursorCache.insert(cacheKey, CursorHandlePtr(new CursorHandle(hc)));
}
return it.value();

4
src/plugins/platforms/windows/qwindowscursor.h
View File

@ -102,8 +102,8 @@ public:
QPoint pos() const Q_DECL_OVERRIDE;
void setPos(const QPoint &pos) Q_DECL_OVERRIDE;
static HCURSOR createPixmapCursor(const QPixmap &pixmap, const QPoint &hotSpot);
static HCURSOR createPixmapCursor(const PixmapCursor &pc) { return createPixmapCursor(pc.pixmap, pc.hotSpot); }
static HCURSOR createPixmapCursor(QPixmap pixmap, const QPoint &hotSpot, qreal scaleFactor = 1);
static HCURSOR createPixmapCursor(const PixmapCursor &pc, qreal scaleFactor = 1) { return createPixmapCursor(pc.pixmap, pc.hotSpot, scaleFactor); }
static PixmapCursor customCursor(Qt::CursorShape cursorShape);
static HCURSOR createCursorFromShape(Qt::CursorShape cursorShape);