PySide6.QtGui.QRhiTextureSubresourceUploadDescription

class QRhiTextureSubresourceUploadDescription

Describes the source for one mip level in a layer in a texture upload operation.

Details

The source content is specified either as a QImage or as a raw blob. The former is only allowed for uncompressed textures with a format that can be mapped to QImage , while the latter is supported for all formats, including floating point and compressed.

Note

image() and data() cannot be both set at the same time.

destinationTopLeft() specifies the top-left corner of the target rectangle. Defaults to (0, 0).

An empty sourceSize() (the default) indicates that size is assumed to be the size of the subresource. With QImage -based uploads this implies that the size of the source image() must match the subresource. When providing raw data instead, sufficient number of bytes must be provided in data() .

sourceTopLeft() is supported only for QImage -based uploads, and specifies the top-left corner of the source rectangle.

Note

Setting sourceSize() or sourceTopLeft() may trigger a QImage copy internally, depending on the format and the backend.

When providing raw data, and the stride is not specified via setDataStride() , the stride (row pitch, row length in bytes) of the provided data must be equal to width * pixelSize where pixelSize is the number of bytes used for one pixel, and there must be no additional padding between rows. There is no row start alignment requirement.

When there is unused data at the end of each row in the input raw data, call setDataStride() with the total number of bytes per row. The stride must always be a multiple of the number of bytes for one pixel. The row stride is only applicable to image data for textures with an uncompressed format.

Note

The format of the source data must be compatible with the texture format. With many graphics APIs the data is copied as-is into a staging buffer, there is no intermediate format conversion provided by QRhi . This applies to floating point formats as well, with, for example, RGBA16F requiring half floats in the source data.

Note

Setting the stride via setDataStride() is only functional when ImageDataStride is reported as supported . In practice this can be expected to be supported everywhere except for OpenGL ES 2.0.

Note

When a QImage is given, the stride returned from QImage::bytesPerLine() is taken into account automatically.

Warning

When a QImage is given and the QImage does not own the underlying pixel data, it is up to the caller to ensure that the associated data stays valid until the end of the frame. (just submitting the resource update batch is not sufficient, the data must stay valid until endFrame() is called in order to be portable across all backends) If this cannot be ensured, the caller is strongly encouraged to call QImage::detach() on the image before passing it to uploadTexture().

Note

This is a RHI API with limited compatibility guarantees, see QRhi for details.

See also

QRhiTextureUploadDescription

Added in version 6.6.

Synopsis

Methods

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

__init__()

Constructs an empty subresource description.

Note

an empty QRhiTextureSubresourceUploadDescription is not useful on its own and should not be submitted to a QRhiTextureUploadEntry . At minimum image or data must be set first.

__init__(data)
Parameters:

data – QByteArray

Constructs a mip level description with the image data specified by data. This is suitable for floating point and compressed formats as well.

__init__(image)
Parameters:

image – QImage

Constructs a mip level description with a image.

The size of image must match the size of the mip level. For level 0 that is the texture size .

The bit depth of image must be compatible with the texture format .

To describe a partial upload, call setSourceSize() , setSourceTopLeft() , or setDestinationTopLeft() afterwards.

__init__(data, size)
Parameters:

  • data – void

  • size – int

Constructs a mip level description with the image data is specified by data and size. This is suitable for floating point and compressed formats as well.

data can safely be destroyed or changed once this function returns.

data()
Return type:

QByteArray

Returns the currently set raw pixel data.

See also

setData()

dataStride()
Return type:

int

Returns the currently set data stride.

See also

setDataStride()

destinationTopLeft()
Return type:

QPoint

Returns the currently set destination top-left position. Defaults to (0, 0).

image()
Return type:

QImage

Returns the currently set QImage .

See also

setImage()

setData(data)
Parameters:

data – QByteArray

Sets data.

Note

image() and data() cannot be both set at the same time.

See also

data()

setDataStride(stride)
Parameters:

stride – int

Sets the data stride in bytes. By default this is 0 and not always relevant. When providing raw data() , and the stride is not specified via setDataStride(), the stride (row pitch, row length in bytes) of the provided data must be equal to width * pixelSize where pixelSize is the number of bytes used for one pixel, and there must be no additional padding between rows. Otherwise, if there is additional space between the lines, set a non-zero stride. All this is applicable only when raw image data is provided, and is not necessary when working QImage since that has its own stride value.

Note

Setting the stride via setDataStride() is only functional when ImageDataStride is reported as supported .

Note

When a QImage is given, the stride returned from QImage::bytesPerLine() is taken into account automatically and therefore there is no need to set the data stride manually.

See also

dataStride()

setDestinationTopLeft(p)
Parameters:

p – QPoint

Sets the destination top-left position p.

setImage(image)
Parameters:

image – QImage

Sets image. Upon textures loading, the image data will be read as is, with no formats conversions.

Note

image() and data() cannot be both set at the same time.

See also

image()

setSourceSize(size)
Parameters:

size – QSize

Sets the source size in pixels.

Note

Setting sourceSize() or sourceTopLeft() may trigger a QImage copy internally, depending on the format and the backend.

See also

sourceSize()

setSourceTopLeft(p)
Parameters:

p – QPoint

Sets the source top-left position p.

Note

Setting sourceSize() or sourceTopLeft() may trigger a QImage copy internally, depending on the format and the backend.

See also

sourceTopLeft()

sourceSize()
Return type:

QSize

Returns the source size in pixels. Defaults to a default-constructed QSize, which indicates the entire subresource.

See also

setSourceSize()

sourceTopLeft()
Return type:

QPoint

Returns the currently set source top-left position. Defaults to (0, 0).