Struct ImageConversionFlag

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pub struct ImageConversionFlag(/* private fields */);

Expand description

The options marked "(default)" are set if no other values from the list are included (since the defaults are zero):

C++ enum: Qt::ImageConversionFlag.

C++ documentation:

The options marked “(default)” are set if no other values from the list are included (since the defaults are zero):

Color/Mono preference (ignored for QBitmap):

Dithering mode preference:

Dithering mode preference for 1-bit alpha masks:

Color matching versus dithering preference:

The ImageConversionFlags type is a typedef for QFlags<ImageConversionFlag>. It stores an OR combination of ImageConversionFlag values.

Implementations§

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impl ImageConversionFlag

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pub const ColorModeMask: ImageConversionFlag

C++ enum variant: ColorMode_Mask = 3

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pub const AutoColor: ImageConversionFlag

(default) - If the image has depth 1 and contains only black and white pixels, the pixmap becomes monochrome. (C++ enum variant: AutoColor = 0)

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pub const ColorOnly: ImageConversionFlag

The pixmap is dithered/converted to the native display depth. (C++ enum variant: ColorOnly = 3)

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pub const MonoOnly: ImageConversionFlag

The pixmap becomes monochrome. If necessary, it is dithered using the chosen dithering algorithm. (C++ enum variant: MonoOnly = 2)

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pub const AlphaDitherMask: ImageConversionFlag

C++ enum variant: AlphaDither_Mask = 12

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pub const ThresholdAlphaDither: ImageConversionFlag

(default) - No dithering. (C++ enum variant: ThresholdAlphaDither = 0)

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pub const OrderedAlphaDither: ImageConversionFlag

A faster, ordered dither. (C++ enum variant: OrderedAlphaDither = 4)

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pub const DiffuseAlphaDither: ImageConversionFlag

A high-quality dither using error diffusion. (C++ enum variant: DiffuseAlphaDither = 8)

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pub const NoAlpha: ImageConversionFlag

C++ enum variant: NoAlpha = 12

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pub const DitherMask: ImageConversionFlag

C++ enum variant: Dither_Mask = 48

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pub const DiffuseDither: ImageConversionFlag

(default) - A high-quality dither using error diffusion. (C++ enum variant: DiffuseDither = 0)

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pub const OrderedDither: ImageConversionFlag

A faster, ordered dither. (C++ enum variant: OrderedDither = 16)

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pub const ThresholdDither: ImageConversionFlag

No dithering; closest color is used. (C++ enum variant: ThresholdDither = 32)

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pub const DitherModeMask: ImageConversionFlag

C++ enum variant: DitherMode_Mask = 192

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pub const AutoDither: ImageConversionFlag

(default) - Only dither when down-converting to 1 or 8-bit indexed formats. (C++ enum variant: AutoDither = 0)

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pub const PreferDither: ImageConversionFlag

Always dither images when converting to smaller color-spaces. (C++ enum variant: PreferDither = 64)

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pub const AvoidDither: ImageConversionFlag

Only dither to indexed formats if the source image uses more different colors than the size of the color table of the destination format. (C++ enum variant: AvoidDither = 128)

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pub const NoOpaqueDetection: ImageConversionFlag

Do not check whether the image contains non-opaque pixels. Use this if you know that the image is semi-transparent and you want to avoid the overhead of checking the pixels in the image until a non-opaque pixel is found, or if you want the pixmap to retain an alpha channel for some other reason. If the image has no alpha channel this flag has no effect. (C++ enum variant: NoOpaqueDetection = 256)

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pub const NoFormatConversion: ImageConversionFlag

Don’t do any format conversions on the image. Can be useful when converting a QImage to a QPixmap for a one-time rendering operation for example. Note that a QPixmap not in the preferred format will be much slower as a paint device. (C++ enum variant: NoFormatConversion = 512)