File › Open and File › Place read HEIC and HEIF still images (.heic,
.heif) through heic-rs 0.1.4, the pure-Rust decoder photocraft-heif
uses, and store the pixels as PNG. Single pictures and grids of tiles,
8 to 10 bits, with or without an alpha image, are read with the
container's rotation, mirror and crop applied. A grid without a color
box of its own takes its tiles'. When neither the image nor its tiles
have an nclx box, the HEVC stream's video signal type gives the
samples' matrix and range. An RGB ICC profile, or Display P3 with the
sRGB curve named by an nclx box or, without a color box, by the
stream, is converted to sRGB. The EXIF resolution tags size the image;
without them it is 72 ppi. When the container's rotations turn the
image an odd number of quarter turns, the resolution's axes swap with
the pixels'.
Image sequences, images that aren't HEVC-coded, grids of cropped tiles
and images past the pixel allowance are refused with a message before
the pixels are decoded. The allowance counts each coded picture at the
size its sequence parameter sets give it.
The decoder is in the engine's `heif` feature, which is on by default
and listed by the desktop, CLI and web apps. A build without it still
recognizes the files and refuses them with a message.
File › Open and File › Place read JP2 files and raw JPEG 2000
codestreams (.jpf, .jpx, .jp2, .j2k, .j2c, .jpc) through hayro-jpeg2000,
and store the pixels as PNG. Gray, RGB, CMYK and ICC-tagged images, with
or without alpha, are converted to RGBA. Several codestreams, JPX
composition or layers, other color spaces, inconsistent or oversize
palettes, inconsistent channel definitions, oversize tile grids and
images past the pixel allowance are refused with a message before the
pixels are decoded.
The capture and display resolution boxes size the image: the box that
comes last sets each axis, and an axis without a usable value uses
72 ppi.
IccProfile::to_srgb_into converts a pixel with the cached transform and
no heap allocation.
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