Unit AdPNGImage

Description

uses

Classes, Interfaces, Objects and Records

Functions and Procedures

Types

Constants

Variables

Description

Provides an image class to load and save PNG files.

Overview

Classes, Interfaces, Objects and Records

Name	Description
Class `EAdPNGInvalidHeaderBytes`
Class `EAdPNGInvalidFileException`
Class `EAdPNGBrokenChunk`
Class `EAdPNGUnsupportedFormatException`
Class `EAdPNGUnknownChunkException`
packed record `TAdPNGChunk`
packed record `TAdPNGHeader`
record `TAdPNGAdam7Pass`
Class `TAdPNGImage`

Types

TAdPNGColorType = set of (pctPalette = 0, pctColor = 1, pctAlpha = 2);

TAdPNGCompressionMethod = (...);

TAdPNGFilterMethod = (...);

TAdPNGInterlaceMethod = (...);

TAdPNGFilterType = (...);

PAdPNGHeader = ˆTAdPNGHeader;

TAdPNGPalette = array of TRGBARec;

TAdPNGScanline = array of Byte;

TAdPNGSample = Byte;

TAdPNGSamples = array of TAdPNGSample;

TAdPNGLine = array of TRGBARec;

TAdPNGPixels = array of array of TRGBARec;

Constants

HIGH_COLORS: array[0..31] of Byte =
  (0, 8, 16, 25, 33, 41, 49, 58, 66, 74, 82, 90, 99, 107, 115, 123, 132,
    140, 148, 156, 165, 173, 181, 189, 197, 206, 214, 222, 230, 239, 247, 255);

UPSAMPLING_TABLE_1BIT: array[0..1] of Byte = (0, 255);

UPSAMPLING_TABLE_2BIT: array[0..3] of Byte = (0, 85, 170, 255);

UPSAMPLING_TABLE_4BIT: array[0..15] of Byte =
  	(0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255);

BITMASKS: array[1..4] of Byte = ($01, $03, $07, $0F);

HEADERBYTES: AnsiString = #$89#$50#$4E#$47#$0D#$A#$1A#$0A;

ADAM7PASSES: array[1..7] of TAdPNGAdam7Pass =
  	(
    	(XOffset: 0; YOffset: 0; XSkip: 8; YSkip: 8),
    	(XOffset: 4; YOffset: 0; XSkip: 8; YSkip: 8),
      (XOffset: 0; YOffset: 4; XSkip: 4; YSkip: 8),
      (XOffset: 2; YOffset: 0; XSkip: 4; YSkip: 4),
      (XOffset: 0; YOffset: 2; XSkip: 2; YSkip: 4),
      (XOffset: 1; YOffset: 0; XSkip: 2; YSkip: 2),
      (XOffset: 0; YOffset: 1; XSkip: 1; YSkip: 2)
    );

Description

Types

TAdPNGColorType = set of (pctPalette = 0, pctColor = 1, pctAlpha = 2);

TAdPNGCompressionMethod = (...);

Values

pcDeflate:

TAdPNGFilterMethod = (...);

Values

pfStandard = 0:

TAdPNGInterlaceMethod = (...);

Values

piNone = 0:
piAdam7 = 1:

TAdPNGFilterType = (...);

Values

pfNone = 0:
pfSub = 1:
pfUp = 2:
pfAverage = 3:
pfPaeth = 4:

PAdPNGHeader = ˆTAdPNGHeader;

TAdPNGPalette = array of TRGBARec;

TAdPNGScanline = array of Byte;

TAdPNGSample = Byte;

TAdPNGSamples = array of TAdPNGSample;

TAdPNGLine = array of TRGBARec;

TAdPNGPixels = array of array of TRGBARec;

Constants

HIGH_COLORS: array[0..31] of Byte =
  (0, 8, 16, 25, 33, 41, 49, 58, 66, 74, 82, 90, 99, 107, 115, 123, 132,
    140, 148, 156, 165, 173, 181, 189, 197, 206, 214, 222, 230, 239, 247, 255);

UPSAMPLING_TABLE_1BIT: array[0..1] of Byte = (0, 255);

UPSAMPLING_TABLE_2BIT: array[0..3] of Byte = (0, 85, 170, 255);

UPSAMPLING_TABLE_4BIT: array[0..15] of Byte =
  	(0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255);

BITMASKS: array[1..4] of Byte = ($01, $03, $07, $0F);

HEADERBYTES: AnsiString = #$89#$50#$4E#$47#$0D#$A#$1A#$0A;

ADAM7PASSES: array[1..7] of TAdPNGAdam7Pass =
  	(
    	(XOffset: 0; YOffset: 0; XSkip: 8; YSkip: 8),
    	(XOffset: 4; YOffset: 0; XSkip: 8; YSkip: 8),
      (XOffset: 0; YOffset: 4; XSkip: 4; YSkip: 8),
      (XOffset: 2; YOffset: 0; XSkip: 4; YSkip: 4),
      (XOffset: 0; YOffset: 2; XSkip: 2; YSkip: 4),
      (XOffset: 1; YOffset: 0; XSkip: 2; YSkip: 2),
      (XOffset: 0; YOffset: 1; XSkip: 1; YSkip: 2)
    );

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