Returns true when the bitmap quad edges are parallel to the canvas axes. This identifies the simplest destination geometry, but does not by itself pro

bool is_file(std::string file_name) { struct stat st; lstat(file_name.c_str(), &st); if (S_ISDIR(st.st_mode)) return fa

Detects bitmap quads that represent a multiple-of-90-degree rotation and writes the detected number of quarter turns. The renderer currently uses this

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Builds a closed Blend2D path from a four-corner bitmap/text/widget quad in canvas coordinates.

Converts a parsed 0-255 RGB triple and a [0, 1] alpha into a Blend2D color (straight alpha; the context premultiplies while compositing).

Compares floating-point canvas coordinates with a small tolerance. Used by geometry classification helpers to avoid treating tiny conversion differenc