package png

Import Path
	github.com/pancsta/d2/lib/png (on go.dev)

Dependency Relation
	imports 7 packages, and imported by one package

Involved Source Files

	    png.go
Package-Level Functions (total 4)

	 func AddExif(png []byte) ([]byte, error)
		AddExif returns png with D2's EXIF metadata inserted after IHDR. An existing
		EXIF chunk is replaced at its original position. The input is validated
		without copying chunk payloads so peak memory remains one input and one
		output buffer.

	 func AddExifInPlace(png []byte) ([]byte, error)
		AddExifInPlace returns png with D2's EXIF metadata inserted after IHDR. It
		reuses the input's backing storage when it has sufficient spare capacity and
		otherwise allocates an exact-sized result. On success, callers must consider
		the input and every alias of its backing storage consumed. Invalid input is
		never modified.

	 func AddExifToEncoderOutputInPlace(png []byte) ([]byte, error)
		AddExifToEncoderOutputInPlace inserts D2's EXIF metadata into a PNG emitted
		directly by an encoder. Unlike AddExifInPlace, it does not rescan and
		checksum every generated image-data chunk. It still verifies the fixed PNG
		envelope before modifying the input. Callers must not use it for untrusted
		or externally supplied PNG data.

	 func WriteExif(w io.Writer) error
		WriteExif writes D2's complete eXIf chunk. A streaming PNG encoder calls it
		after IHDR, before emitting image data, without retaining the encoded image.


Package-Level Constants (only one)

	const SCALE = 2
		SCALE is the static raster device scale used by PNG, PDF, and PPTX export.

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