Descriptor for one transcoded image in the image pool. More...

#include <book.h>

Data Fields
uint32_t	id_off
	String-pool offset of the source href / manifest id.
uint16_t	width
	Pixel width.
uint16_t	height
	Pixel height.
uint8_t	format
	book_image_format_t.
uint8_t	pixel_format
	book_image_pixfmt_t (0 == gray4; SVG: 0).
uint16_t	reserved2
	Padding; 0.
uint32_t	data_off
	Image-pool offset of the compressed pixel data.
uint32_t	data_size
	Compressed length in bytes.
uint32_t	raw_size
	Inflated length in bytes.

Detailed Description

Descriptor for one transcoded image in the image pool.

id_off is the original manifest href so an <img src> attribute value resolves to this entry. Raster images are packed grayscale at source resolution (panel-ready, no decode; an opt-in compile knob can clamp the long edge) – 4bpp (2px/byte) or 8bpp (1px/byte) per pixel_format; SVG is kept as verbatim vector source. Pool bytes are raw – the blob is chunk-DEFLATE-wrapped on disk (see book_container_t) and inflated on open, so per-image compression would not help – thus data_size == raw_size and data_off indexes the image pool.

Since: Version 0.1.0

Definition at line 354 of file book.h.

Field Documentation

◆ data_off

uint32_t book_image_t::data_off

Image-pool offset of the compressed pixel data.

Definition at line 361 of file book.h.

Referenced by book_image_data(), internal_append_image_descriptor(), internal_book_image_row(), and internal_book_image_row_gray8().

◆ data_size

uint32_t book_image_t::data_size

Compressed length in bytes.

Definition at line 362 of file book.h.

Referenced by internal_append_image_descriptor().

◆ format

uint8_t book_image_t::format

book_image_format_t.

Definition at line 358 of file book.h.

Referenced by book_src_image_rect(), erb_render_image(), internal_append_image_descriptor(), and sh_gray4_image().

◆ height

uint16_t book_image_t::height

Pixel height.

Definition at line 357 of file book.h.

Referenced by book_src_image_rect(), erb_render_image(), internal_append_image_descriptor(), sh_gray4_image(), sh_image_blit_cover(), sh_image_decode_gray8(), sh_image_loupe(), and sh_image_loupe_map().

◆ id_off

uint32_t book_image_t::id_off

String-pool offset of the source href / manifest id.

Definition at line 355 of file book.h.

Referenced by internal_append_image_descriptor().

◆ pixel_format

uint8_t book_image_t::pixel_format

book_image_pixfmt_t (0 == gray4; SVG: 0).

Definition at line 359 of file book.h.

Referenced by book_image_pixfmt(), and internal_append_image_descriptor().

◆ raw_size

uint32_t book_image_t::raw_size

Inflated length in bytes.

Definition at line 363 of file book.h.

Referenced by erb_render_image(), and internal_append_image_descriptor().

◆ reserved2

uint16_t book_image_t::reserved2

Padding; 0.

Definition at line 360 of file book.h.

◆ width

uint16_t book_image_t::width

Pixel width.

Definition at line 356 of file book.h.

Referenced by book_src_image_rect(), erb_render_image(), internal_append_image_descriptor(), internal_book_image_row(), internal_book_image_row_gray8(), sh_gray4_fetch_row(), sh_gray4_image(), sh_image_blit_cover(), sh_image_decode_gray8(), sh_image_loupe(), and sh_image_loupe_map().

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

apps/shared_libs/book/inc/book.h

Data Fields