Getting started

Unit BGRALzpCommon

📄 Source code

Description
Uses
Structures
Functions and Procedures
Types
Constants
Variables

Description

Type and structure definitions for LazPaint image format

Uses

Overview

Structures

Name Description
Packed Record TLazPaintImageHeader Format of header for LazPaint files

Functions and Procedures

function DecodeLazRLE(ASource: TStream; var destBuffer; availableOutputSize: PtrInt; availableInputSize: int64 = -1): PtrInt;
procedure EncodeLazRLE(var sourceBuffer; size:PtrInt; ADest: TStream);
procedure LazPaintImageHeader_SwapEndianIfNeeded(AHeader: TLazPaintImageHeader);

Types

TLzpCompression = (...);

Constants

LazpaintChannelBlueFromGreen = 4;
LazpaintChannelBlueFromRed = 2;
LazpaintChannelGreenFromRed = 1;
LazpaintChannelNoAlpha = 8;
LazpaintPalettedRGB = 16;
LazPaintThumbMaxHeight = 128;
LazPaintThumbMaxWidth = 128;
LAZPAINT_COMPRESSION_MASK = 255;
LAZPAINT_COMPRESSION_MODE_RLE = 2;
LAZPAINT_COMPRESSION_MODE_ZSTREAM = 1;
LAZPAINT_MAGIC_HEADER : array[0..7] of char = 'LazPaint';
LAZPAINT_THUMBNAIL_PNG = 256;

Description

Functions and Procedures

function DecodeLazRLE(ASource: TStream; var destBuffer; availableOutputSize: PtrInt; availableInputSize: int64 = -1): PtrInt;

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procedure EncodeLazRLE(var sourceBuffer; size:PtrInt; ADest: TStream);

routines to compress and uncompress byte-sized values (you need to separate the channels to obtain any compression)

procedure LazPaintImageHeader_SwapEndianIfNeeded(AHeader: TLazPaintImageHeader);

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Types

TLzpCompression = (...);

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Values
  • lzpZStream
  • lzpRLE: slower and not necessarily better

Constants

LazpaintChannelBlueFromGreen = 4;

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LazpaintChannelBlueFromRed = 2;

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LazpaintChannelGreenFromRed = 1;

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LazpaintChannelNoAlpha = 8;

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LazpaintPalettedRGB = 16;

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LazPaintThumbMaxHeight = 128;

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LazPaintThumbMaxWidth = 128;

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LAZPAINT_COMPRESSION_MASK = 255;

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LAZPAINT_COMPRESSION_MODE_RLE = 2;

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LAZPAINT_COMPRESSION_MODE_ZSTREAM = 1;

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LAZPAINT_MAGIC_HEADER : array[0..7] of char = 'LazPaint';

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LAZPAINT_THUMBNAIL_PNG = 256;

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