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ImDrawList: harden/clarify static asserts about ImDrawCmd / ImDrawCmdHeader layout.

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ocornut
2025-12-05 13:42:15 +01:00
parent fee06a92ea
commit e2c49530cb
1 changed files with 4 additions and 1 deletions
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imgui_draw.cpp
+4 -1
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@@ -444,10 +444,13 @@ void ImDrawList::_SetDrawListSharedData(ImDrawListSharedData* data)
// In the majority of cases, you would want to call PushClipRect() and PushTexture() after this. // In the majority of cases, you would want to call PushClipRect() and PushTexture() after this.
void ImDrawList::_ResetForNewFrame() void ImDrawList::_ResetForNewFrame()
{ {
// Verify that the ImDrawCmd fields we want to memcmp() are contiguous in memory. // Verify that the ImDrawCmd fields we want to memcmp() are contiguous in memory to match ImDrawCmdHeader.
IM_STATIC_ASSERT(offsetof(ImDrawCmd, ClipRect) == 0); IM_STATIC_ASSERT(offsetof(ImDrawCmd, ClipRect) == 0);
IM_STATIC_ASSERT(offsetof(ImDrawCmd, TexRef) == sizeof(ImVec4)); IM_STATIC_ASSERT(offsetof(ImDrawCmd, TexRef) == sizeof(ImVec4));
IM_STATIC_ASSERT(offsetof(ImDrawCmd, VtxOffset) == sizeof(ImVec4) + sizeof(ImTextureRef)); IM_STATIC_ASSERT(offsetof(ImDrawCmd, VtxOffset) == sizeof(ImVec4) + sizeof(ImTextureRef));
IM_STATIC_ASSERT(offsetof(ImDrawCmd, ClipRect) == offsetof(ImDrawCmdHeader, ClipRect));
IM_STATIC_ASSERT(offsetof(ImDrawCmd, TexRef) == offsetof(ImDrawCmdHeader, TexRef));
IM_STATIC_ASSERT(offsetof(ImDrawCmd, VtxOffset) == offsetof(ImDrawCmdHeader, VtxOffset));
if (_Splitter._Count > 1) if (_Splitter._Count > 1)
_Splitter.Merge(this); _Splitter.Merge(this);