Class TDitheringToIndexedImage
Unit
Declaration
type TDitheringToIndexedImage = class(TObject)
Description
Handles dithering of an image
Hierarchy
- TObject
- TDitheringToIndexedImage
Overview
Fields
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FBitOrder: TRawImageBitOrder; |
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FBitsPerPixel: integer; |
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FByteOrder: TRawImageByteOrder; |
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FCurrentBitOrderMask: Int32or64; |
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FCurrentData: PByte; |
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FCurrentMaxY: Int32or64; |
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FCurrentOutputScanline: PByte; |
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FCurrentOutputY: Int32or64; |
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FCurrentScanlineSize: PtrInt; |
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FIgnoreAlpha: boolean; |
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FLineOrder: TRawImageLineOrder; |
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FPalette: TBGRACustomApproxPalette; |
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FTransparentColorIndex: Int32or64; |
Methods
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constructor Create(APalette: TBGRACustomApproxPalette; AIgnoreAlpha: boolean; ABitsPerPixelForIndices: integer); overload; |
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constructor Create(APalette: TBGRACustomApproxPalette; AIgnoreAlpha: boolean; ABitsPerPixelForIndices: integer; AByteOrder: TRawImageByteOrder); overload; |
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function AllocateSpaceForIndexedData(AImage: TBGRACustomBitmap; AScanlineSize: PtrInt): pointer; |
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function ComputeMinimumScanlineSize(AWidthInPixels: integer): PtrInt; |
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function DitherImage(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AScanlineSize: PtrInt): Pointer; overload; |
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function DitherImage(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap): Pointer; overload; |
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function GetScanline(Y: Int32or64): Pointer; virtual; |
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function GetTransparentColorIndex: integer; |
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procedure DitherImageTo(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AData: Pointer; AScanlineSize: PtrInt); overload; |
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procedure DitherImageTo(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AData: Pointer); overload; |
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procedure OutputPixelFullByte(X,Y: Int32or64; AColorIndex: Int32or64; AColor: TBGRAPixel); virtual; |
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procedure OutputPixelSubByte(X,Y: Int32or64; AColorIndex: Int32or64; AColor: TBGRAPixel); virtual; |
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procedure SetBitOrder(AValue: TRawImageBitOrder); virtual; |
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procedure SetBitsPerPixel(AValue: integer); virtual; |
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procedure SetByteOrder(AValue: TRawImageByteOrder); virtual; |
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procedure SetIgnoreAlpha(AValue: boolean); |
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procedure SetLineOrder(AValue: TRawImageLineOrder); |
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procedure SetPalette(AValue: TBGRACustomApproxPalette); |
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procedure SetTransparentColorIndex(AValue: integer); |
Properties
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property BitOrder: TRawImageBitOrder read FBitOrder write SetBitOrder; |
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property BitsPerPixel: integer read FBitsPerPixel write SetBitsPerPixel; |
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property ByteOrder: TRawImageByteOrder read FByteOrder write SetByteOrder; |
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property DefaultTransparentColorIndex: integer read GetTransparentColorIndex write SetTransparentColorIndex; |
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property IgnoreAlpha: boolean read FIgnoreAlpha write SetIgnoreAlpha; |
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property LineOrder: TRawImageLineOrder read FLineOrder write SetLineOrder; |
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property Palette: TBGRACustomApproxPalette read FPalette write SetPalette; |
Description
Fields
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FBitOrder: TRawImageBitOrder; |
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This item has no description. | |
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FBitsPerPixel: integer; |
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This item has no description. | |
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FByteOrder: TRawImageByteOrder; |
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This item has no description. | |
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FCurrentBitOrderMask: Int32or64; |
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This item has no description. | |
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FCurrentData: PByte; |
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This item has no description. | |
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FCurrentMaxY: Int32or64; |
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This item has no description. | |
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FCurrentOutputScanline: PByte; |
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This item has no description. | |
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FCurrentOutputY: Int32or64; |
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This item has no description. | |
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FCurrentScanlineSize: PtrInt; |
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following variables are used during dithering | |
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FIgnoreAlpha: boolean; |
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This item has no description. | |
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FLineOrder: TRawImageLineOrder; |
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This item has no description. | |
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FPalette: TBGRACustomApproxPalette; |
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This item has no description. | |
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FTransparentColorIndex: Int32or64; |
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This item has no description. | |
Methods
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constructor Create(APalette: TBGRACustomApproxPalette; AIgnoreAlpha: boolean; ABitsPerPixelForIndices: integer); overload; |
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This item has no description. | |
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constructor Create(APalette: TBGRACustomApproxPalette; AIgnoreAlpha: boolean; ABitsPerPixelForIndices: integer; AByteOrder: TRawImageByteOrder); overload; |
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use platform byte order | |
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function AllocateSpaceForIndexedData(AImage: TBGRACustomBitmap; AScanlineSize: PtrInt): pointer; |
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This item has no description. | |
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function ComputeMinimumScanlineSize(AWidthInPixels: integer): PtrInt; |
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This item has no description. | |
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function DitherImage(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AScanlineSize: PtrInt): Pointer; overload; |
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use minimum scanline size | |
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function DitherImage(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap): Pointer; overload; |
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maybe necessary if larger than 8 bits per pixel | |
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function GetScanline(Y: Int32or64): Pointer; virtual; |
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This item has no description. | |
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function GetTransparentColorIndex: integer; |
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This item has no description. | |
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procedure DitherImageTo(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AData: Pointer; AScanlineSize: PtrInt); overload; |
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use minimum scanline size | |
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procedure DitherImageTo(AAlgorithm: TDitheringAlgorithm; AImage: TBGRACustomBitmap; AData: Pointer); overload; |
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This item has no description. | |
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procedure OutputPixelFullByte(X,Y: Int32or64; AColorIndex: Int32or64; AColor: TBGRAPixel); virtual; |
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This item has no description. | |
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procedure OutputPixelSubByte(X,Y: Int32or64; AColorIndex: Int32or64; AColor: TBGRAPixel); virtual; |
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This item has no description. | |
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procedure SetBitOrder(AValue: TRawImageBitOrder); virtual; |
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This item has no description. | |
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procedure SetBitsPerPixel(AValue: integer); virtual; |
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This item has no description. | |
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procedure SetByteOrder(AValue: TRawImageByteOrder); virtual; |
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This item has no description. | |
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procedure SetIgnoreAlpha(AValue: boolean); |
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This item has no description. | |
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procedure SetLineOrder(AValue: TRawImageLineOrder); |
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This item has no description. | |
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procedure SetPalette(AValue: TBGRACustomApproxPalette); |
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This item has no description. | |
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procedure SetTransparentColorIndex(AValue: integer); |
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This item has no description. | |
Properties
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property BitOrder: TRawImageBitOrder read FBitOrder write SetBitOrder; |
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This item has no description. | |
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property BitsPerPixel: integer read FBitsPerPixel write SetBitsPerPixel; |
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optional customization of format | |
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property ByteOrder: TRawImageByteOrder read FByteOrder write SetByteOrder; |
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This item has no description. | |
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property DefaultTransparentColorIndex: integer read GetTransparentColorIndex write SetTransparentColorIndex; |
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when there is no transparent color in the palette, or that IgnoreAlpha is set to True, this allows to define the index for the fully transparent color | |
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property IgnoreAlpha: boolean read FIgnoreAlpha write SetIgnoreAlpha; |
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This item has no description. | |
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property LineOrder: TRawImageLineOrder read FLineOrder write SetLineOrder; |
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This item has no description. | |
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property Palette: TBGRACustomApproxPalette read FPalette write SetPalette; |
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This item has no description. | |