更新窗口画布的双缓冲 rct 更新区域（坐标都为 0 表示全部区域）

Retrieve list of range (2 int per range, values are inclusive)

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清除消息，直至获取到符合类型的消息 支持混合消息类型

owner_id may be None/Any, but routing_id needs to be always be set, so we default to GetCurrentFocusScope().

This is provided for consistency (but we don't actually use this)

Helper: Load file content into memory Memory allocated with IM_ALLOC(), must be freed by user using IM_FREE() == ImGui::MemFree() This can't really be

Clear all output. Invalidates all AddCustomRect() return values!

Destroy builder and all cached glyphs. Do not destroy actual fonts.

use unused_frames==0 to discard everything.

On font removal we need to remove references (otherwise we could queue removal?) We allow old_font == new_font which forces updating all values (e.g.

Set current texture. This is mostly called from AddTexture() + to handle a failed resize.

Load fallback in order to obtain its index (this is called from in hot-path so we avoid extraneous parameters to minimize impact on code size)

For user-facing functions: return NULL on invalid ID. Important: return pointer is valid until next call to AddRect(), e.g. FindGlyph(), CalcTextSize(

Copy block from one texture to another

Optimized for batch edits (with same value of 'selected')

Convert RGBA32 to BGRA32 (because RGBA32 is not well supported by DX9 devices)

Functions

Functions

Based on stb_to_utf8() from github.com/nothings/stb/

Call IncludeItemByIndex() or IncludeItemsByIndex() *BEFORE* first call to Step() if you need a range of items to not be clipped, regardless of their v

Distribute storage for nodes, ears and reflexes. FIXME-OPT: if everything is convex, we could report it to caller and let it switch to an convex rende

真正创建窗口的函数（阻塞）

Find the shortest single replacement we can make to get from old_buf to new_buf Note that this doesn't directly alter state->TextA, state->TextLen. Th

是否为边缘点

- We need this to filter some Shortcut() routes when an item e.g. an InputText() is active e.g. ImGuiKey_G won't be considered a shortcut when item is

Pass text data straight to log (without being displayed)

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