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Added commentary about DLL boundaries. Added GetAllocatorFunctions(). Tidying up. (#3836)
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ocornut
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@ -50,6 +50,7 @@ Other Changes:
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with ImGuiSliderFlags_AlwaysClamp + only one of either p_min or p_max set. (#3824) [@harry75369]
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- Window: Shrink close button hit-testing region when it covers an abnormally high portion of the window visible
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area (e.g. when window is collapsed + moved in a corner) to facilitate moving the window away. (#3825)
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- Added GetAllocatorFunctions() to facilitate sharing allocators accross DLL boundaries. (#3836)
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- ImDrawList: AddCircle, AddCircleFilled(): Tweaked default segment count calculation to honor MaxError
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with more accuracy. Made default segment count always even for better looking result. (#3808) [@thedmd]
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- ImDrawList: AddCircle, AddCircleFilled(): New default for style.
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@ -20,7 +20,9 @@
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//#define IM_ASSERT(_EXPR) ((void)(_EXPR)) // Disable asserts
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//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
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// Using dear imgui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
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// Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
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// DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
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// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
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//#define IMGUI_API __declspec( dllexport )
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//#define IMGUI_API __declspec( dllimport )
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53
imgui.cpp
53
imgui.cpp
@ -911,27 +911,33 @@ static void UpdateViewportsNewFrame();
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// [SECTION] CONTEXT AND MEMORY ALLOCATORS
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//-----------------------------------------------------------------------------
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// DLL users:
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// - Heaps and globals are not shared across DLL boundaries!
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// - You will need to call SetCurrentContext() + SetAllocatorFunctions() for each static/DLL boundary you are calling from.
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// - Same apply for hot-reloading mechanisms that are reliant on reloading DLL (note that many hot-reloading mechanism works without DLL).
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// - Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
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// - Confused? In a debugger: add GImGui to your watch window and notice how its value changes depending on your current location (which DLL boundary you are in).
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// Current context pointer. Implicitly used by all Dear ImGui functions. Always assumed to be != NULL.
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// ImGui::CreateContext() will automatically set this pointer if it is NULL. Change to a different context by calling ImGui::SetCurrentContext().
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// 1) Important: globals are not shared across DLL boundaries! If you use DLLs or any form of hot-reloading: you will need to call
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// SetCurrentContext() (with the pointer you got from CreateContext) from each unique static/DLL boundary, and after each hot-reloading.
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// In your debugger, add GImGui to your watch window and notice how its value changes depending on which location you are currently stepping into.
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// 2) Important: Dear ImGui functions are not thread-safe because of this pointer.
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// If you want thread-safety to allow N threads to access N different contexts, you can:
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// - Change this variable to use thread local storage so each thread can refer to a different context, in imconfig.h:
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// struct ImGuiContext;
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// extern thread_local ImGuiContext* MyImGuiTLS;
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// #define GImGui MyImGuiTLS
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// And then define MyImGuiTLS in one of your cpp file. Note that thread_local is a C++11 keyword, earlier C++ uses compiler-specific keyword.
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// - Future development aim to make this context pointer explicit to all calls. Also read https://github.com/ocornut/imgui/issues/586
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// - If you need a finite number of contexts, you may compile and use multiple instances of the ImGui code from different namespace.
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// - ImGui::CreateContext() will automatically set this pointer if it is NULL.
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// Change to a different context by calling ImGui::SetCurrentContext().
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// - Important: Dear ImGui functions are not thread-safe because of this pointer.
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// If you want thread-safety to allow N threads to access N different contexts:
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// - Change this variable to use thread local storage so each thread can refer to a different context, in your imconfig.h:
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// struct ImGuiContext;
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// extern thread_local ImGuiContext* MyImGuiTLS;
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// #define GImGui MyImGuiTLS
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// And then define MyImGuiTLS in one of your cpp file. Note that thread_local is a C++11 keyword, earlier C++ uses compiler-specific keyword.
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// - Future development aim to make this context pointer explicit to all calls. Also read https://github.com/ocornut/imgui/issues/586
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// - If you need a finite number of contexts, you may compile and use multiple instances of the ImGui code from different namespace.
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// - DLL users: read comments above.
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#ifndef GImGui
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ImGuiContext* GImGui = NULL;
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#endif
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// Memory Allocator functions. Use SetAllocatorFunctions() to change them.
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// If you use DLL hotreloading you might need to call SetAllocatorFunctions() after reloading code from this file.
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// Otherwise, you probably don't want to modify them mid-program, and if you use global/static e.g. ImVector<> instances you may need to keep them accessible during program destruction.
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// - You probably don't want to modify those mid-program, and if you use global/static e.g. ImVector<> instances you may need to keep them accessible during program destruction.
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// - DLL users: read comments above.
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#ifndef IMGUI_DISABLE_DEFAULT_ALLOCATORS
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static void* MallocWrapper(size_t size, void* user_data) { IM_UNUSED(user_data); return malloc(size); }
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static void FreeWrapper(void* ptr, void* user_data) { IM_UNUSED(user_data); free(ptr); }
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@ -939,10 +945,9 @@ static void FreeWrapper(void* ptr, void* user_data) { IM_UNUSED(user_d
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static void* MallocWrapper(size_t size, void* user_data) { IM_UNUSED(user_data); IM_UNUSED(size); IM_ASSERT(0); return NULL; }
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static void FreeWrapper(void* ptr, void* user_data) { IM_UNUSED(user_data); IM_UNUSED(ptr); IM_ASSERT(0); }
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#endif
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static void* (*GImAllocatorAllocFunc)(size_t size, void* user_data) = MallocWrapper;
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static void (*GImAllocatorFreeFunc)(void* ptr, void* user_data) = FreeWrapper;
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static void* GImAllocatorUserData = NULL;
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static ImGuiMemAllocFunc* GImAllocatorAllocFunc = MallocWrapper;
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static ImGuiMemFreeFunc* GImAllocatorFreeFunc = FreeWrapper;
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static void* GImAllocatorUserData = NULL;
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//-----------------------------------------------------------------------------
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// [SECTION] USER FACING STRUCTURES (ImGuiStyle, ImGuiIO)
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@ -3330,13 +3335,21 @@ void ImGui::SetCurrentContext(ImGuiContext* ctx)
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#endif
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}
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void ImGui::SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data)
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void ImGui::SetAllocatorFunctions(ImGuiMemAllocFunc* alloc_func, ImGuiMemFreeFunc* free_func, void* user_data)
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{
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GImAllocatorAllocFunc = alloc_func;
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GImAllocatorFreeFunc = free_func;
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GImAllocatorUserData = user_data;
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}
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// This is provided to facilitate copying allocators from one static/DLL boundary to another (e.g. retrieve default allocator of your executable address space)
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void ImGui::GetAllocatorFunctions(ImGuiMemAllocFunc** p_alloc_func, ImGuiMemFreeFunc** p_free_func, void** p_user_data)
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{
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*p_alloc_func = GImAllocatorAllocFunc;
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*p_free_func = GImAllocatorFreeFunc;
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*p_user_data = GImAllocatorUserData;
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}
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ImGuiContext* ImGui::CreateContext(ImFontAtlas* shared_font_atlas)
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{
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ImGuiContext* ctx = IM_NEW(ImGuiContext)(shared_font_atlas);
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15
imgui.h
15
imgui.h
@ -193,6 +193,8 @@ typedef void* ImTextureID; // User data for rendering backend to identi
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typedef unsigned int ImGuiID; // A unique ID used by widgets, typically hashed from a stack of string.
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typedef int (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData* data); // Callback function for ImGui::InputText()
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typedef void (*ImGuiSizeCallback)(ImGuiSizeCallbackData* data); // Callback function for ImGui::SetNextWindowSizeConstraints()
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typedef void* (ImGuiMemAllocFunc)(size_t sz, void* user_data); // Function signature for ImGui::SetAllocatorFunctions()
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typedef void (ImGuiMemFreeFunc)(void* ptr, void* user_data); // Function signature for ImGui::SetAllocatorFunctions()
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// Character types
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// (we generally use UTF-8 encoded string in the API. This is storage specifically for a decoded character used for keyboard input and display)
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@ -255,8 +257,9 @@ struct ImVec4
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namespace ImGui
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{
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// Context creation and access
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// Each context create its own ImFontAtlas by default. You may instance one yourself and pass it to CreateContext() to share a font atlas between imgui contexts.
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// None of those functions is reliant on the current context.
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// - Each context create its own ImFontAtlas by default. You may instance one yourself and pass it to CreateContext() to share a font atlas between contexts.
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// - DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
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// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for details.
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IMGUI_API ImGuiContext* CreateContext(ImFontAtlas* shared_font_atlas = NULL);
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IMGUI_API void DestroyContext(ImGuiContext* ctx = NULL); // NULL = destroy current context
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IMGUI_API ImGuiContext* GetCurrentContext();
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@ -868,9 +871,11 @@ namespace ImGui
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IMGUI_API bool DebugCheckVersionAndDataLayout(const char* version_str, size_t sz_io, size_t sz_style, size_t sz_vec2, size_t sz_vec4, size_t sz_drawvert, size_t sz_drawidx); // This is called by IMGUI_CHECKVERSION() macro.
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// Memory Allocators
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// - All those functions are not reliant on the current context.
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// - If you reload the contents of imgui.cpp at runtime, you may need to call SetCurrentContext() + SetAllocatorFunctions() again because we use global storage for those.
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IMGUI_API void SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data = NULL);
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// - Those functions are not reliant on the current context.
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// - DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
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// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
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IMGUI_API void SetAllocatorFunctions(ImGuiMemAllocFunc* alloc_func, ImGuiMemFreeFunc* free_func, void* user_data = NULL);
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IMGUI_API void GetAllocatorFunctions(ImGuiMemAllocFunc** p_alloc_func, ImGuiMemFreeFunc** p_free_func, void** p_user_data);
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IMGUI_API void* MemAlloc(size_t size);
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IMGUI_API void MemFree(void* ptr);
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