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: TGPUCompression); |
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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 (some) S3TC images. 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].
Exceptions raised
- ECannotFlipCompressedImage
- Raised when image Height is not 1, 2, 3 or a multiple of 4 (since the trick doesn't work in these cases, pixels would move between 4x4 blocks). Note that if Height is a power of two (as common for OpenGL textures) then it's always possible to make a flip.
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Properties
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