Blitsy

Pixel manipulation utilities for bitsylike tools and game engines.

Texture Encoding

Convert a canvas context 2d into a compact structure of base64 encoded pixels and metadata:
const data = encodeTexture(context2d, 'RGBA8');

Convert back to a canvas context 2d:
const context2d = decodeTexture(data);

Available formats:

• RGBA8 each pixel has one byte per channel, same as canvas imagedata.
• R8 encodes only the red channel, using one byte per pixel.
• R4 encodes only the red channel, using 4 bits per pixel.
• M1 encodes only on/off pixel transparency, using 1 bit per pixel.

Font Encoding

Load the ascii small font (from bitsy):
const asciiSmall = decodeFont(fonts['ascii-small'])

Fetch glyphs from the font:
const g = asciiSmall.get('g'.codePointAt(0));

Draw glyph:
drawSprite(context2d, g.sprite, 0, 0);