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

Convert ABGR to ARGB.

Convert ABGR to I420.

Convert AR30 to ARGB.

Convert ARGB1555 to ARGB.

Convert ARGB1555 to I420.

Convert ARGB4444 to ARGB.

Convert ARGB4444 to I420.

Copy ARGB pixels from source image with slope to a row of destination.

Apply a 4x4 matrix to each ARGB pixel. Note: Normally for shading, but can be used to swizzle or invert.

Computes table of cumulative sum for image where the value is the sum of all values above and to the left of the entry. Used by ARGBBlur.

Convert ARGB to I420.

Cubic Bezier takes 4 controls points

Pass in translated ASCII characters for text input. - with glfw you can get those from the callback set in glfwSetCharCallback() - on Windows you can

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'

based on libvpx arm_cpudetect.c For Arm, but public to allow testing on any CPU

Convert BGRA to ARGB.

Convert BGRA to I420.

Use case A: Begin() called from constructor with items_height<0, then called again from Sync() in StepNo 1 Use case B: Begin() called from constructor

Closely mimics PathBezierToCasteljau() in imgui_draw.cpp

Alpha Blend plane and store to destination.

If you get an error please report on GitHub. You may try different GL context version or GLSL version.