PTF

Table of contents

• Format
  • Header
    • Info
    • Flags
    • Pixel format
    • Resolution
  • Data
    • I pixel
    • IA pixel
    • RGB pixel
    • RGBA pixel

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Format

• Current version is 0.0
• File extension is .ptf
• Data is little endian
• LZ4F is used for compression

Type	Description
Header	File header
Data	Image data

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Header

Type	Value	Description
char[3]	{'P', 'T', 'F'}	Header magic
u8	0	Major version
u8	Info	Info
u8	Resolution	Resolution

Info

Bits (LSB to MSB)	Value	Description
0..1	Pixel format	Pixel data format
2..3	0	Reserved
4..7	Flags	Flags

Flags

Bits (LSB to MSB)	Value	Description
0..3	0	Reserved

Pixel format

Name	Value
PTF_FRMT_I	0
PTF_FRMT_IA	1
PTF_FRMT_RGB	2
PTF_FRMT_RGBA	3

Resolution

Bits (LSB to MSB)	Description
0..3	Width (2^n)
4..7	Height (2^n)

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Data

Type	Value	Description
u8[]	Compressed ‘I pixel × 1…’, ‘IA pixel × 1…’, ‘RGB pixel × 1…’, or ‘RGBA pixel × 1…’	Pixel data

I pixel

Type	Description
u8	Intensity

IA pixel

Type	Description
u8[2]	Intensity and alpha

RGB pixel

Type	Description
u8[3]	Red, green, and blue

RGBA pixel

Type	Description
u8[4]	Red, green, blue, and alpha

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Generated 2026-10-20 02:18:56 +0000