Helper for ColorPicker4()

Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.

Clear and initialize empty settings instance

Adjust flags: default width mode + stretch columns are not allowed when auto extending

Pop trailing draw command (used before merging or presenting to user) Note that this leaves the ImDrawList in a state unfit for further commands, as m

Initialize before use in a new frame. We always have a command ready in the buffer.

Helper: Text buffer for logging/accumulating text

traverse the layout to locate the nearest character to a display position

discard the oldest entry in the undo list

find the x/y location of a character, and remember info about the previous row in case we get a move-up event (for page up, we'll have to rescan)

canoncialize the selection so start <= end

create the png data from post-deflated data

decode one 64-entry block--

get some unsigned bits

returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow

set up the kernels

read 16bit value and convert to 24bit RGB

find minimum y position if it starts at x1

rects array must be big enough to accommodate all characters in the given ranges

check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string

Cubic Bezier takes 4 controls points

Quadratic Bezier takes 3 controls points

Guaranteed to honor 'num_segments'

Guaranteed to honor 'num_segments'

Advanced: Channels - Use to split render into layers. By switching channels to can render out-of-order (e.g. submit FG primitives before BG primitives