zoom_book_src_t Struct Reference

One .rabook raster figure, ready to be magnified. More...

#include <zoom_book.h>

Collaboration diagram for zoom_book_src_t:

Data Fields
const book_src_t *	src
	Borrowed book source (resident or paged).
book_image_t	img
	Copy of the image descriptor being zoomed.

Detailed Description

One .rabook raster figure, ready to be magnified.

Holds a borrowed pointer to the book source and a copy of the image descriptor. The copy matters: on a paged book the descriptor itself lives behind the page cache, so re-reading it per row would fault a frame per row for 24 bytes that never change.

Invariant

src is non-NULL and outlives this binding.

img.format == k_book_image_gray4 (SVG is rejected at bind).

Example:

zoom_book_src_t fig = {};
zoom_source_t   src = {};
(void)zoom_book_src_init(&fig, &book_src, image_index);
(void)zoom_book_src_bind(&fig, &src);

See also

zoom_book_src_init

Since

0.1.0

Definition at line 63 of file zoom_book.h.

Field Documentation

img

book_image_t zoom_book_src_t::img

Copy of the image descriptor being zoomed.

Definition at line 65 of file zoom_book.h.

src

const book_src_t* zoom_book_src_t::src

Borrowed book source (resident or paged).

Definition at line 64 of file zoom_book.h.

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The documentation for this struct was generated from the following file:

• apps/shared_libs/zoom/inc/zoom_book.h