问题描述
启用 DPI 缩放后，文字不会有太明显的锯齿问题，但是使用 设置的图标却会显得很模糊。比如下述代码：
# coding:utf-8
import os
import sys
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QApplication, QPushButton, QWidget
class Demo(QWidget):
def __init__(self):
super().__init__(parent=None)
self.resize(300, 300)
self.button = QPushButton(' Shuffle all', self)
self.button.setIcon(QIcon("Shuffle.png"))
self.button.move(self.width()//2-self.button.width()//2,
self.height()//2-self.button.height()//2)
if __name__ == '__main__':
os.environ["QT_ENABLE_HIGHDPI_SCALING"] = "0"
os.environ["QT_SCALE_FACTOR"] = '1.25'
app = QApplication(sys.argv)
demo = Demo()
demo.show()
app.exec_()运行结果如下图所示，可以看到图标的锯齿现象非常明显：
问题解决
# coding:utf-8
from PyQt5.QtCore import QPoint, QRect, QSize, Qt
from PyQt5.QtGui import QIcon, QIconEngine, QImage, QPixmap, QPainter
class PixmapIconEngine(QIconEngine):
""" Pixmap icon engine """
def __init__(self, iconPath: str):
self.iconPath = iconPath
super().__init__()
def paint(self, painter: QPainter, rect: QRect, mode: QIcon.Mode, state: QIcon.State):
painter.setRenderHints(QPainter.Antialiasing |
QPainter.SmoothPixmapTransform)
painter.drawImage(rect, QImage(self.iconPath))
def pixmap(self, size: QSize, mode: QIcon.Mode, state: QIcon.State) -> QPixmap:
pixmap = QPixmap(size)
pixmap.fill(Qt.transparent)
self.paint(QPainter(pixmap), QRect(QPoint(0, 0), size), mode, state)
return pixmap
class Icon(QIcon):
def __init__(self, iconPath: str):
self.iconPath = iconPath
super().__init__(PixmapIconEngine(iconPath))接着只要把 换成 ，并开启 ，就能解决图标模糊的问题了，效果如下图所示：