Crate letratag_render 

Deterministic image rendering. The canvas is feed columns by 32 head rows.

Active rows are a design choice, not a physical printhead calibration. Images keep their aspect ratio (rounded down to whole pixels, with a one-pixel minimum), including any existing white margins, and are centered on the full canvas. An odd spare pixel goes on the right or bottom. Scaling uses nearest neighbors sampled at pixel centers. No text, font, or PDF rendering is done.

Structs

RenderOptions

Enums

Error

Constants

MAX_DECODE_BYTES

MAX_PNG_BYTES

MAX_SOURCE_DIMENSION

MAX_SOURCE_PIXELS

Functions

preview_png

Encode the actual full-height raster, without rescaling or trimming.

render_gray

Render row-major 8-bit grayscale: zero is black and 255 is white.

render_png

Decode only PNG. Header dimensions are checked before decoder construction; Limits bounds its buffers and decoded storage is checked before allocation. Alpha is composited on white before integer Rec. 709 luminance conversion. For APNG, only the default PNG image is rendered, not animation frames.