Helper for ColorPicker4()

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

Bit ambiguous: used to detect when user didn't built texture but effectively we should check TexID != 0 except that would be backend dependent...

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

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

UTF16 strings use surrogate pairs to encode codepoints >= 0x10000, so we should save the high surrogate.

Guaranteed to honor 'num_segments'

Guaranteed to honor 'num_segments'

Compare to detect usage errors

Cursor & Selection

After a user-input the cursor stays on for a while without blinking

Find window given position, search front-to-back FIXME: Note that we have an inconsequential lag here: OuterRectClipped is updated in Begin(), so wind