ereader_jpeg Directory Reference

Directory dependency graph for ereader_jpeg:

Directories
	inc
	src

Detailed Description

Decodes a baked RGB JPEG cover through the zero-heap ra8_img_decode_blit() pipeline, nearest-neighbour scales it into a fixed RGB565 framebuffer in internal SRAM, and hashes the framebuffer (#143) – the JPEG counterpart to ereader_image, which covers PNG. JPEG is the format most book cover art actually ships in. Allocation comes only from a fixed SRAM bump arena, so the decode reaches no malloc. Headless – no panel, SDRAM, touch or SD.

Integer nearest-neighbour scaling and a fixed RGB565 pack over a zeroed static framebuffer make the render deterministic, so the same hash appears on host, under the emulator and on silicon, and any drift in the JPEG decoder or the toolchain trips it. The fixture is the same source image as the PNG gate's, JPEG-encoded, so the two gates differ only in the decoder under test.