PCMP ("PMCP") - Palette Compression

Author(s): Gonhex
Research: NOCASH

The palette compression is an optional component for the color runtime. It reduces the number of palettes, if the palette section allows 16 of them. Useful to save memory but not often used.

Table of Contents

• Data Structure
  • Section Container
  • PCMP Container
• Specification
  • Files

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Data Structure

Section Container

struct ContainerSectionPCMP
{
    /* 0x0 */ struct NitroSectionHeader sectionHeader;
    /* 0x8 */ struct ContainerPCMP sectionData;
}; // entry size = sectionHeader.lengthSection

Field Name	Description	Data Type
sectionHeader	Header of this section. sectionHeader.signature = "PMCP".	NitroSectionHeader
sectionData	Content of this section.	ContainerPCMP

PCMP Container

struct ContainerPCMP
{
    // header
    /* 0x0 */ uint16_t numberPalettes;
    /* 0x2 */ uint16_t unknown0;
    /* 0x4 */ uint32_t offsetDataIndices;
    
    // data
    /* offsetDataIndices */ uint16_t dataIndices[numberPalettes];
}; // entry size = numberPalettes * 2 + offsetDataIndices

Field Name	Description	Data Type
numberPalettes	Limits the number of palettes used in the PLTT section.	uint16_t
unknown0	Always 0xBEEF.	uint16_t
offsetDataIndices	Offset to the index table relative to ContainerPCMP.	uint32_t
dataIndices	Index table, incrementing from 0. The data may have no effect on the palettes.	uint16_t[]

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Specification

Files

• Nitro Color Runtime