jpegio – Support for JPEG image decoding

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class jpegio.JpegDecoder

A JPEG decoder

A JpegDecoder allocates a few thousand bytes of memory. To reduce memory fragmentation, create a single JpegDecoder object and use it anytime a JPEG image needs to be decoded.

Example:

from jpegio import JpegDecoder
from displayio import Bitmap

decoder = JpegDecoder()
width, height = decoder.open("/sd/example.jpg")
bitmap = Bitmap(width, height, 65535)
decoder.decode(bitmap)
# .. do something with bitmap
open(filename: str) Tuple[int, int]
open(buffer: circuitpython_typing.ReadableBuffer) Tuple[int, int]
open(bytesio: io.BytesIO) Tuple[int, int]

Use the specified object as the JPEG data source.

The source may be a filename, a binary buffer in memory, or an opened binary stream.

The single parameter is positional-only (write open(f), not open(filename=f) but due to technical limitations this is not shown in the function signature in the documentation.

Returns the image size as the tuple (width, height).

decode(bitmap: displayio.Bitmap, scale: int = 0, x: int = 0, y: int = 0, *, x1: int, y1: int, x2: int, y2: int, skip_source_index: int, skip_dest_index: int) None

Decode JPEG data

The bitmap must be large enough to contain the decoded image. The pixel data is stored in the displayio.Colorspace.RGB565_SWAPPED colorspace.

The image is optionally downscaled by a factor of 2**scale. Scaling by a factor of 8 (scale=3) is particularly efficient in terms of decoding time.

The remaining parameters are as for bitmaptools.blit. Because JPEG is a lossy data format, chroma keying based on the “source index” is not reliable, because the same original RGB value might end up being decompressed as a similar but not equal color value. Using a higher JPEG encoding quality can help, but ultimately it will not be perfect.

After a call to decode, you must open a new JPEG. It is not possible to repeatedly decode the same jpeg data, even if it is to select different scales or crop regions from it.

Parameters:
  • bitmap (Bitmap) – Optional output buffer

  • scale (int) – Scale factor from 0 to 3, inclusive.

  • x (int) – Horizontal pixel location in bitmap where source_bitmap upper-left corner will be placed

  • y (int) – Vertical pixel location in bitmap where source_bitmap upper-left corner will be placed

  • x1 (int) – Minimum x-value for rectangular bounding box to be copied from the source bitmap

  • y1 (int) – Minimum y-value for rectangular bounding box to be copied from the source bitmap

  • x2 (int) – Maximum x-value (exclusive) for rectangular bounding box to be copied from the source bitmap

  • y2 (int) – Maximum y-value (exclusive) for rectangular bounding box to be copied from the source bitmap

  • skip_source_index (int) – bitmap palette index in the source that will not be copied, set to None to copy all pixels

  • skip_dest_index (int) – bitmap palette index in the destination bitmap that will not get overwritten by the pixels from the source