Class TGPUCompressedImage
Unit
CastleImages
Declaration
type TGPUCompressedImage = class(TEncodedImage)
Description
Image compressed using one of the GPU texture compression algorithms.
Hierarchy
Overview
Methods
Properties
Description
Methods
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constructor Create(const AWidth, AHeight, ADepth: Cardinal; const ACompression: TTextureCompression); |
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function Size: Cardinal; override; |
Size of the whole image data inside RawPixels, in bytes.
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function HasAlpha: boolean; override; |
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function AlphaChannel( const AlphaTolerance: Byte): TAlphaChannel; override; |
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procedure FlipVertical; |
Flip compressed image vertically, losslessly.
This works only for S3TC images, and only when their height is 1, 2, 3 or a multiple of 4. Note that this is always satisfied if image height is a power of two (as common for textures). It uses the knowledge of how S3TC compression works to losslessly flip the image, without re-compressing it. The idea is described here [http://users.telenet.be/tfautre/softdev/ddsload/explanation.htm].
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function MakeCopy: TGPUCompressedImage; |
Create a new image object that has exactly the same class and the same data (size, pixels) as this image.
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function CreateCopy: TEncodedImage; override; |
Create a new image object that has exactly the same class and the same data (size, pixels) as this image.
Equivalent to MakeCopy, but virtual and declared as returning TEncodedImage class.
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Properties
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