if there's a pending marker from the entropy stream, return that otherwise, fetch from the stream and get a marker. if there's no marker, return 0xff,

Tries resizing the buffer to contain *count* elements. If T is a POD type the new elements may not be initialized.

Close the file in zip opened with unzipOpenCurrentFile Return UNZ_CRCERROR if all the file was read but the CRC is not good

获取图像尺寸 可以方便地处理 IMAGE 指针为空，即指向主绘图窗口的情况

Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts It is STRONGLY preferred that you use docking bran

Known size hash It is ok to call ImHashData on a string with known length but the ### operator won't be supported. FIXME-OPT: Replace with e.g. FNV1a

Inputs FIXME: Eventually we should aim to move e.g. IsActiveIdUsingKey() into IsKeyXXX functions.

检验窗口索引是否合法

占用文件

Converts value in the range [0, 100) to a string.

打开文件 成功返回 true，失败返回 false

take a -128..127 value and stbi__clamp it and convert to 0..255

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

Radix-4 decimation-in-time FFT butterfly. This version assumes that all four elements of the butterfly are adjacent in a single vector. Compute the p

We should in theory be using fseeko()/ftello() with off_t and _fseeki64()/_ftelli64() with __int64, waiting for the PR that does that in a very portab

Simple word-wrapping for English, not full-featured. Please submit failing cases! This will return the next location to wrap from. If no wrapping if n

FIXME: Should rework API toward allowing multiple in-flight temp buffers (easier and safer for caller) by making the caller acquire a temp buffer toke

Push a clipping rectangle for both ImGui logic (hit-testing etc.) and low-level ImDrawList rendering. - When using this function it is sane to ensure

We don't use g.FontSize because the window may be != g.CurrentWindow.

It is the map we need iterate to find valid items, since we don't have "alive" storage anywhere

do not use begin() and end() to avoid collision with fmt/ranges

Reports an error if using the manual argument indexing; otherwise returns the next argument index and switches to the automatic indexing. */