Qt 5 Compatibility APIs: Qt Graphical Effects

The Qt Graphical Effects module is provided for compatibility with applications written for Qt 5.

注意: Since the Qt Graphical Effects module has performance constraints when effects are stacked, it is primarily included for compatibility with Qt 5 applications. We recommend that new code is written with one of the new solutions for effects that were introduced in Qt 6. For typical UI effects, Qt Quick has the MultiEffect , which applies multiple effects in one pass. For advanced use cases which are not covered by this component, the Qt Quick Effect Maker tool can be used to customize and fine-tune exactly the shader effects you need.

Using Qt Graphical Effects

Effects are visual items that can be added to Qt Quick user interface as UI components. To import the Qt Graphical Effects types, include the Qt Graphical Effects module by adding the following statement to the QML file:

import Qt5Compat.GraphicalEffects
					

To use the effects, simply add a specific effect declaration to the QML scene and configure the effects properties. The source item type can be any QML type, even video or another effect. Pipelining multiple effects together is a simple way to create even more impressive output.

The following list presents the functional division of types that are part of Qt Graphical Effects.

Blend

Blend 通过使用融合方式合并 2 源项

颜色

BrightnessContrast Adjusts brightness and contrast
ColorOverlay Alters the colors of the source item by applying an overlay color
Colorize Sets the color in the HSL color space
Desaturate Reduces the saturation of the colors
GammaAdjust Alters the luminance of the source item
HueSaturation Alters the source item colors in the HSL color space
LevelAdjust Adjusts color levels in the RGBA color space

Gradient

ConicalGradient 绘制锥形渐变
LinearGradient 绘制线性渐变
RadialGradient 绘制径向渐变

Distortion

Displace Moves the pixels of the source item according to the given displacement map

Drop Shadow

DropShadow Generates a soft shadow behind the source item
InnerShadow Generates a colorized and blurred shadow inside the source

Blur

FastBlur Applies a fast blur effect to one or more source items
GaussianBlur 应用更高质量的模糊效果
MaskedBlur Applies a blur effect with a varying intesity
RecursiveBlur Blurs repeatedly, providing a strong blur effect

运动模糊

DirectionalBlur 把模糊效果应用到指定方向
RadialBlur Applies directional blur in a circular direction around the items center point
ZoomBlur Applies directional blur effect towards source items center point

Glow

Glow Generates a blurred and colorized image of the source and places it behind the original, giving impression that the source is glowing
RectangularGlow Generates a blurred and colorized rectangle, which gives the impression that the source is glowing

掩码

OpacityMask Masks the source item with another item
ThresholdMask Masks the source item with another item and applies a threshold value