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ImageItem high DPI support.

This commit is contained in:
Black Hat 2018-11-22 19:44:11 +08:00
parent 58593015c1
commit 6d30e9d682
1 changed files with 14 additions and 21 deletions
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35
src/imageitem.cpp
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@ -1,8 +1,10 @@
#include "imageitem.h" #include "imageitem.h"
#include <QApplication>
#include <QBitmap> #include <QBitmap>
#include <QGraphicsOpacityEffect> #include <QGraphicsOpacityEffect>
#include <QRect> #include <QRect>
#include <QScreen>
ImageItem::ImageItem(QQuickItem *parent) : QQuickPaintedItem(parent) {} ImageItem::ImageItem(QQuickItem *parent) : QQuickPaintedItem(parent) {}
@ -16,19 +18,22 @@ inline static QString stringtoColor(QString string) {
return colour; return colour;
} }
inline static QImage getImageFromPaintable(QPointer<Paintable> p, QRectF b) { inline static QImage getImageFromPaintable(QPointer<Paintable> p, int width,
int height) {
if (p.isNull()) return {}; if (p.isNull()) return {};
QImage image(p->image(int(b.width()), int(b.height()))); qreal dpi = QApplication::primaryScreen()->devicePixelRatio();
QImage image(p->image(width * dpi, height * dpi));
if (image.isNull()) return {}; if (image.isNull()) return {};
return image; return image;
} }
void ImageItem::paint(QPainter *painter) { void ImageItem::paint(QPainter *painter) {
QRectF bounding_rect = boundingRect(); QRectF bounding_rect(boundingRect());
painter->setRenderHint(QPainter::Antialiasing, true); painter->setRenderHint(QPainter::Antialiasing, true);
QImage image(getImageFromPaintable(m_paintable, bounding_rect)); QImage image(getImageFromPaintable(m_paintable, bounding_rect.width(),
bounding_rect.height()));
if (image.isNull()) { if (image.isNull()) {
painter->setPen(Qt::NoPen); painter->setPen(Qt::NoPen);
@ -37,11 +42,9 @@ void ImageItem::paint(QPainter *painter) {
else else
painter->setBrush(QColor(m_color)); painter->setBrush(QColor(m_color));
if (m_round) if (m_round)
painter->drawEllipse(0, 0, int(bounding_rect.width()), painter->drawEllipse(bounding_rect);
int(bounding_rect.height()));
else else
painter->drawRect(0, 0, int(bounding_rect.width()), painter->drawRect(bounding_rect);
int(bounding_rect.height()));
painter->setPen(QPen(Qt::white, 2)); painter->setPen(QPen(Qt::white, 2));
QFont font; QFont font;
font.setStyleHint(QFont::SansSerif); font.setStyleHint(QFont::SansSerif);
@ -49,25 +52,15 @@ void ImageItem::paint(QPainter *painter) {
font.setPixelSize(int(bounding_rect.width() / 2)); font.setPixelSize(int(bounding_rect.width() / 2));
font.setBold(true); font.setBold(true);
painter->setFont(font); painter->setFont(font);
painter->drawText( painter->drawText(bounding_rect, Qt::AlignCenter, m_hint.at(0).toUpper());
QRect(0, 0, int(bounding_rect.width()), int(bounding_rect.height())),
Qt::AlignCenter, m_hint.at(0).toUpper());
} else { } else {
QImage scaled = image.scaled(
int(bounding_rect.width()) + 1, int(bounding_rect.height()) + 1,
Qt::KeepAspectRatioByExpanding, Qt::FastTransformation);
QPointF center = bounding_rect.center() - scaled.rect().center();
if (m_round) { if (m_round) {
QPainterPath clip; QPainterPath clip;
clip.addEllipse( clip.addEllipse(bounding_rect); // this is the shape we want to clip to
0, 0, bounding_rect.width(),
bounding_rect.height()); // this is the shape we want to clip to
painter->setClipPath(clip); painter->setClipPath(clip);
} }
painter->drawImage(center, scaled); painter->drawImage(bounding_rect, image);
} }
} }