PNG

Represents the PNG file's data. This struct is intended to be passed around by pointer.

struct PNG {

ubyte[8] magic;

alias header = magic;

Chunk[] chunks;

Chunk* getChunk(string what);

Chunk* getChunkNullable(string what);

bool insertChunk(Chunk* chk, bool replaceExisting);

bool replaceChunk(Chunk* chk);

}

Members

Aliases

header deprecated alias header = magic: The PNG file magic number header. Please note the image data header is a IHDR chunk, not this (see getHeader for that). This just a static identifier

Functions

getChunk Chunk* getChunk(string what): Gets the chunk with the given name, or throws if it cannot be found.
getChunkNullable Chunk* getChunkNullable(string what): Gets the chunk with the given name, return null if it is not found.
insertChunk bool insertChunk(Chunk* chk, bool replaceExisting): Insert chunk before IDAT. PNG specs allows to drop all chunks after IDAT, so we have to insert our custom chunks right before it. Use Chunk.create() to create new chunk, and then insertChunk() to add it. Return true if we did replacement.
replaceChunk bool replaceChunk(Chunk* chk): Convenient wrapper for insertChunk().

Variables

chunks Chunk[] chunks;: The array of chunks that make up the file contents. See getChunkNullable, getChunk, insertChunk, and replaceChunk for functions to access and manipulate this array.
length uint length;: The length of the file.
magic ubyte[8] magic;: The PNG file magic number header. Please note the image data header is a IHDR chunk, not this (see getHeader for that). This just a static identifier

Meta

Source

See Implementation