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imgui_internal.h
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imgui_internal.h
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// dear imgui, v1.90.8
// (internal structures/api)
// You may use this file to debug, understand or extend Dear ImGui features but we don't provide any guarantee of forward compatibility.
/*
Index of this file:
// [SECTION] Header mess
// [SECTION] Forward declarations
// [SECTION] Context pointer
// [SECTION] STB libraries includes
// [SECTION] Macros
// [SECTION] Generic helpers
// [SECTION] ImDrawList support
// [SECTION] Data types support
// [SECTION] Widgets support: flags, enums, data structures
// [SECTION] Popup support
// [SECTION] Inputs support
// [SECTION] Clipper support
// [SECTION] Navigation support
// [SECTION] Typing-select support
// [SECTION] Columns support
// [SECTION] Multi-select support
// [SECTION] Docking support
// [SECTION] Viewport support
// [SECTION] Settings support
// [SECTION] Localization support
// [SECTION] Metrics, Debug tools
// [SECTION] Generic context hooks
// [SECTION] ImGuiContext (main imgui context)
// [SECTION] ImGuiWindowTempData, ImGuiWindow
// [SECTION] Tab bar, Tab item support
// [SECTION] Table support
// [SECTION] ImGui internal API
// [SECTION] ImFontAtlas internal API
// [SECTION] Test Engine specific hooks (imgui_test_engine)
*/
#pragma once
#ifndef IMGUI_DISABLE
//-----------------------------------------------------------------------------
// [SECTION] Header mess
//-----------------------------------------------------------------------------
#ifndef IMGUI_VERSION
#include "imgui.h"
#endif
#include <stdio.h> // FILE*, sscanf
#include <stdlib.h> // NULL, malloc, free, qsort, atoi, atof
#include <math.h> // sqrtf, fabsf, fmodf, powf, floorf, ceilf, cosf, sinf
#include <limits.h> // INT_MIN, INT_MAX
// Enable SSE intrinsics if available
#if (defined __SSE__ || defined __x86_64__ || defined _M_X64 || (defined(_M_IX86_FP) && (_M_IX86_FP >= 1))) && !defined(IMGUI_DISABLE_SSE)
#define IMGUI_ENABLE_SSE
#include <immintrin.h>
#endif
// Visual Studio warnings
#ifdef _MSC_VER
#pragma warning (push)
#pragma warning (disable: 4251) // class 'xxx' needs to have dll-interface to be used by clients of struct 'xxx' // when IMGUI_API is set to__declspec(dllexport)
#pragma warning (disable: 26812) // The enum type 'xxx' is unscoped. Prefer 'enum class' over 'enum' (Enum.3). [MSVC Static Analyzer)
#pragma warning (disable: 26495) // [Static Analyzer] Variable 'XXX' is uninitialized. Always initialize a member variable (type.6).
#if defined(_MSC_VER) && _MSC_VER >= 1922 // MSVC 2019 16.2 or later
#pragma warning (disable: 5054) // operator '|': deprecated between enumerations of different types
#endif
#endif
// Clang/GCC warnings with -Weverything
#if defined(__clang__)
#pragma clang diagnostic push
#if __has_warning("-Wunknown-warning-option")
#pragma clang diagnostic ignored "-Wunknown-warning-option" // warning: unknown warning group 'xxx'
#endif
#pragma clang diagnostic ignored "-Wunknown-pragmas" // warning: unknown warning group 'xxx'
#pragma clang diagnostic ignored "-Wfloat-equal" // warning: comparing floating point with == or != is unsafe // storing and comparing against same constants ok, for ImFloor()
#pragma clang diagnostic ignored "-Wunused-function" // for stb_textedit.h
#pragma clang diagnostic ignored "-Wmissing-prototypes" // for stb_textedit.h
#pragma clang diagnostic ignored "-Wold-style-cast"
#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
#pragma clang diagnostic ignored "-Wdouble-promotion"
#pragma clang diagnostic ignored "-Wimplicit-int-float-conversion" // warning: implicit conversion from 'xxx' to 'float' may lose precision
#pragma clang diagnostic ignored "-Wmissing-noreturn" // warning: function 'xxx' could be declared with attribute 'noreturn'
#pragma clang diagnostic ignored "-Wdeprecated-enum-enum-conversion"// warning: bitwise operation between different enumeration types ('XXXFlags_' and 'XXXFlagsPrivate_') is deprecated
#pragma clang diagnostic ignored "-Wunsafe-buffer-usage" // warning: 'xxx' is an unsafe pointer used for buffer access
#elif defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpragmas" // warning: unknown option after '#pragma GCC diagnostic' kind
#pragma GCC diagnostic ignored "-Wclass-memaccess" // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
#endif
// In 1.89.4, we moved the implementation of "courtesy maths operators" from imgui_internal.h in imgui.h
// As they are frequently requested, we do not want to encourage to many people using imgui_internal.h
#if defined(IMGUI_DEFINE_MATH_OPERATORS) && !defined(IMGUI_DEFINE_MATH_OPERATORS_IMPLEMENTED)
#error Please '#define IMGUI_DEFINE_MATH_OPERATORS' _BEFORE_ including imgui.h!
#endif
// Legacy defines
#ifdef IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS // Renamed in 1.74
#error Use IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS
#endif
#ifdef IMGUI_DISABLE_MATH_FUNCTIONS // Renamed in 1.74
#error Use IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
#endif
// Enable stb_truetype by default unless FreeType is enabled.
// You can compile with both by defining both IMGUI_ENABLE_FREETYPE and IMGUI_ENABLE_STB_TRUETYPE together.
#ifndef IMGUI_ENABLE_FREETYPE
#define IMGUI_ENABLE_STB_TRUETYPE
#endif
//-----------------------------------------------------------------------------
// [SECTION] Forward declarations
//-----------------------------------------------------------------------------
struct ImBitVector; // Store 1-bit per value
struct ImRect; // An axis-aligned rectangle (2 points)
struct ImDrawDataBuilder; // Helper to build a ImDrawData instance
struct ImDrawListSharedData; // Data shared between all ImDrawList instances
struct ImGuiColorMod; // Stacked color modifier, backup of modified data so we can restore it
struct ImGuiContext; // Main Dear ImGui context
struct ImGuiContextHook; // Hook for extensions like ImGuiTestEngine
struct ImGuiDataVarInfo; // Variable information (e.g. to access style variables from an enum)
struct ImGuiDataTypeInfo; // Type information associated to a ImGuiDataType enum
struct ImGuiGroupData; // Stacked storage data for BeginGroup()/EndGroup()
struct ImGuiInputTextState; // Internal state of the currently focused/edited text input box
struct ImGuiInputTextDeactivateData;// Short term storage to backup text of a deactivating InputText() while another is stealing active id
struct ImGuiLastItemData; // Status storage for last submitted items
struct ImGuiLocEntry; // A localization entry.
struct ImGuiMenuColumns; // Simple column measurement, currently used for MenuItem() only
struct ImGuiNavItemData; // Result of a gamepad/keyboard directional navigation move query result
struct ImGuiNavTreeNodeData; // Temporary storage for last TreeNode() being a Left arrow landing candidate.
struct ImGuiMetricsConfig; // Storage for ShowMetricsWindow() and DebugNodeXXX() functions
struct ImGuiNextWindowData; // Storage for SetNextWindow** functions
struct ImGuiNextItemData; // Storage for SetNextItem** functions
struct ImGuiOldColumnData; // Storage data for a single column for legacy Columns() api
struct ImGuiOldColumns; // Storage data for a columns set for legacy Columns() api
struct ImGuiPopupData; // Storage for current popup stack
struct ImGuiSettingsHandler; // Storage for one type registered in the .ini file
struct ImGuiStackSizes; // Storage of stack sizes for debugging/asserting
struct ImGuiStyleMod; // Stacked style modifier, backup of modified data so we can restore it
struct ImGuiTabBar; // Storage for a tab bar
struct ImGuiTabItem; // Storage for a tab item (within a tab bar)
struct ImGuiTable; // Storage for a table
struct ImGuiTableHeaderData; // Storage for TableAngledHeadersRow()
struct ImGuiTableColumn; // Storage for one column of a table
struct ImGuiTableInstanceData; // Storage for one instance of a same table
struct ImGuiTableTempData; // Temporary storage for one table (one per table in the stack), shared between tables.
struct ImGuiTableSettings; // Storage for a table .ini settings
struct ImGuiTableColumnsSettings; // Storage for a column .ini settings
struct ImGuiTypingSelectState; // Storage for GetTypingSelectRequest()
struct ImGuiTypingSelectRequest; // Storage for GetTypingSelectRequest() (aimed to be public)
struct ImGuiWindow; // Storage for one window
struct ImGuiWindowTempData; // Temporary storage for one window (that's the data which in theory we could ditch at the end of the frame, in practice we currently keep it for each window)
struct ImGuiWindowSettings; // Storage for a window .ini settings (we keep one of those even if the actual window wasn't instanced during this session)
// Enumerations
// Use your programming IDE "Go to definition" facility on the names of the center columns to find the actual flags/enum lists.
enum ImGuiLocKey : int; // -> enum ImGuiLocKey // Enum: a localization entry for translation.
typedef int ImGuiLayoutType; // -> enum ImGuiLayoutType_ // Enum: Horizontal or vertical
// Flags
typedef int ImGuiActivateFlags; // -> enum ImGuiActivateFlags_ // Flags: for navigation/focus function (will be for ActivateItem() later)
typedef int ImGuiDebugLogFlags; // -> enum ImGuiDebugLogFlags_ // Flags: for ShowDebugLogWindow(), g.DebugLogFlags
typedef int ImGuiFocusRequestFlags; // -> enum ImGuiFocusRequestFlags_ // Flags: for FocusWindow();
typedef int ImGuiItemFlags; // -> enum ImGuiItemFlags_ // Flags: for PushItemFlag(), g.LastItemData.InFlags
typedef int ImGuiItemStatusFlags; // -> enum ImGuiItemStatusFlags_ // Flags: for g.LastItemData.StatusFlags
typedef int ImGuiOldColumnFlags; // -> enum ImGuiOldColumnFlags_ // Flags: for BeginColumns()
typedef int ImGuiNavHighlightFlags; // -> enum ImGuiNavHighlightFlags_ // Flags: for RenderNavHighlight()
typedef int ImGuiNavMoveFlags; // -> enum ImGuiNavMoveFlags_ // Flags: for navigation requests
typedef int ImGuiNextItemDataFlags; // -> enum ImGuiNextItemDataFlags_ // Flags: for SetNextItemXXX() functions
typedef int ImGuiNextWindowDataFlags; // -> enum ImGuiNextWindowDataFlags_// Flags: for SetNextWindowXXX() functions
typedef int ImGuiScrollFlags; // -> enum ImGuiScrollFlags_ // Flags: for ScrollToItem() and navigation requests
typedef int ImGuiSeparatorFlags; // -> enum ImGuiSeparatorFlags_ // Flags: for SeparatorEx()
typedef int ImGuiTextFlags; // -> enum ImGuiTextFlags_ // Flags: for TextEx()
typedef int ImGuiTooltipFlags; // -> enum ImGuiTooltipFlags_ // Flags: for BeginTooltipEx()
typedef int ImGuiTypingSelectFlags; // -> enum ImGuiTypingSelectFlags_ // Flags: for GetTypingSelectRequest()
typedef int ImGuiWindowRefreshFlags; // -> enum ImGuiWindowRefreshFlags_ // Flags: for SetNextWindowRefreshPolicy()
typedef void (*ImGuiErrorLogCallback)(void* user_data, const char* fmt, ...);
//-----------------------------------------------------------------------------
// [SECTION] Context pointer
// See implementation of this variable in imgui.cpp for comments and details.
//-----------------------------------------------------------------------------
#ifndef GImGui
extern IMGUI_API ImGuiContext* GImGui; // Current implicit context pointer
#endif
//-------------------------------------------------------------------------
// [SECTION] STB libraries includes
//-------------------------------------------------------------------------
namespace ImStb
{
#undef IMSTB_TEXTEDIT_STRING
#undef IMSTB_TEXTEDIT_CHARTYPE
#define IMSTB_TEXTEDIT_STRING ImGuiInputTextState
#define IMSTB_TEXTEDIT_CHARTYPE ImWchar
#define IMSTB_TEXTEDIT_GETWIDTH_NEWLINE (-1.0f)
#define IMSTB_TEXTEDIT_UNDOSTATECOUNT 99
#define IMSTB_TEXTEDIT_UNDOCHARCOUNT 999
#include "imstb_textedit.h"
} // namespace ImStb
//-----------------------------------------------------------------------------
// [SECTION] Macros
//-----------------------------------------------------------------------------
// Debug Printing Into TTY
// (since IMGUI_VERSION_NUM >= 18729: IMGUI_DEBUG_LOG was reworked into IMGUI_DEBUG_PRINTF (and removed framecount from it). If you were using a #define IMGUI_DEBUG_LOG please rename)
#ifndef IMGUI_DEBUG_PRINTF
#ifndef IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS
#define IMGUI_DEBUG_PRINTF(_FMT,...) printf(_FMT, __VA_ARGS__)
#else
#define IMGUI_DEBUG_PRINTF(_FMT,...) ((void)0)
#endif
#endif
// Debug Logging for ShowDebugLogWindow(). This is designed for relatively rare events so please don't spam.
#ifndef IMGUI_DISABLE_DEBUG_TOOLS
#define IMGUI_DEBUG_LOG(...) ImGui::DebugLog(__VA_ARGS__)
#else
#define IMGUI_DEBUG_LOG(...) ((void)0)
#endif
#define IMGUI_DEBUG_LOG_ACTIVEID(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventActiveId) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_FOCUS(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventFocus) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_POPUP(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventPopup) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_NAV(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventNav) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_SELECTION(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventSelection) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_CLIPPER(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventClipper) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_IO(...) do { if (g.DebugLogFlags & ImGuiDebugLogFlags_EventIO) IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
#define IMGUI_DEBUG_LOG_INPUTROUTING(...) do{if (g.DebugLogFlags & ImGuiDebugLogFlags_EventInputRouting)IMGUI_DEBUG_LOG(__VA_ARGS__); } while (0)
// Static Asserts
#define IM_STATIC_ASSERT(_COND) static_assert(_COND, "")
// "Paranoid" Debug Asserts are meant to only be enabled during specific debugging/work, otherwise would slow down the code too much.
// We currently don't have many of those so the effect is currently negligible, but onward intent to add more aggressive ones in the code.
//#define IMGUI_DEBUG_PARANOID
#ifdef IMGUI_DEBUG_PARANOID
#define IM_ASSERT_PARANOID(_EXPR) IM_ASSERT(_EXPR)
#else
#define IM_ASSERT_PARANOID(_EXPR)
#endif
// Error handling
// Down the line in some frameworks/languages we would like to have a way to redirect those to the programmer and recover from more faults.
#ifndef IM_ASSERT_USER_ERROR
#define IM_ASSERT_USER_ERROR(_EXP,_MSG) IM_ASSERT((_EXP) && _MSG) // Recoverable User Error
#endif
// Misc Macros
#define IM_PI 3.14159265358979323846f
#ifdef _WIN32
#define IM_NEWLINE "\r\n" // Play it nice with Windows users (Update: since 2018-05, Notepad finally appears to support Unix-style carriage returns!)
#else
#define IM_NEWLINE "\n"
#endif
#ifndef IM_TABSIZE // Until we move this to runtime and/or add proper tab support, at least allow users to compile-time override
#define IM_TABSIZE (4)
#endif
#define IM_MEMALIGN(_OFF,_ALIGN) (((_OFF) + ((_ALIGN) - 1)) & ~((_ALIGN) - 1)) // Memory align e.g. IM_ALIGN(0,4)=0, IM_ALIGN(1,4)=4, IM_ALIGN(4,4)=4, IM_ALIGN(5,4)=8
#define IM_F32_TO_INT8_UNBOUND(_VAL) ((int)((_VAL) * 255.0f + ((_VAL)>=0 ? 0.5f : -0.5f))) // Unsaturated, for display purpose
#define IM_F32_TO_INT8_SAT(_VAL) ((int)(ImSaturate(_VAL) * 255.0f + 0.5f)) // Saturated, always output 0..255
#define IM_TRUNC(_VAL) ((float)(int)(_VAL)) // ImTrunc() is not inlined in MSVC debug builds
#define IM_ROUND(_VAL) ((float)(int)((_VAL) + 0.5f)) //
#define IM_STRINGIFY_HELPER(_X) #_X
#define IM_STRINGIFY(_X) IM_STRINGIFY_HELPER(_X) // Preprocessor idiom to stringify e.g. an integer.
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
#define IM_FLOOR IM_TRUNC
#endif
// Enforce cdecl calling convention for functions called by the standard library, in case compilation settings changed the default to e.g. __vectorcall
#ifdef _MSC_VER
#define IMGUI_CDECL __cdecl
#else
#define IMGUI_CDECL
#endif
// Warnings
#if defined(_MSC_VER) && !defined(__clang__)
#define IM_MSVC_WARNING_SUPPRESS(XXXX) __pragma(warning(suppress: XXXX))
#else
#define IM_MSVC_WARNING_SUPPRESS(XXXX)
#endif
// Debug Tools
// Use 'Metrics/Debugger->Tools->Item Picker' to break into the call-stack of a specific item.
// This will call IM_DEBUG_BREAK() which you may redefine yourself. See https://github.com/scottt/debugbreak for more reference.
#ifndef IM_DEBUG_BREAK
#if defined (_MSC_VER)
#define IM_DEBUG_BREAK() __debugbreak()
#elif defined(__clang__)
#define IM_DEBUG_BREAK() __builtin_debugtrap()
#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
#define IM_DEBUG_BREAK() __asm__ volatile("int3;nop")
#elif defined(__GNUC__) && defined(__thumb__)
#define IM_DEBUG_BREAK() __asm__ volatile(".inst 0xde01")
#elif defined(__GNUC__) && defined(__arm__) && !defined(__thumb__)
#define IM_DEBUG_BREAK() __asm__ volatile(".inst 0xe7f001f0")
#else
#define IM_DEBUG_BREAK() IM_ASSERT(0) // It is expected that you define IM_DEBUG_BREAK() into something that will break nicely in a debugger!
#endif
#endif // #ifndef IM_DEBUG_BREAK
// Format specifiers, printing 64-bit hasn't been decently standardized...
// In a real application you should be using PRId64 and PRIu64 from <inttypes.h> (non-windows) and on Windows define them yourself.
#if defined(_MSC_VER) && !defined(__clang__)
#define IM_PRId64 "I64d"
#define IM_PRIu64 "I64u"
#define IM_PRIX64 "I64X"
#else
#define IM_PRId64 "lld"
#define IM_PRIu64 "llu"
#define IM_PRIX64 "llX"
#endif
//-----------------------------------------------------------------------------
// [SECTION] Generic helpers
// Note that the ImXXX helpers functions are lower-level than ImGui functions.
// ImGui functions or the ImGui context are never called/used from other ImXXX functions.
//-----------------------------------------------------------------------------
// - Helpers: Hashing
// - Helpers: Sorting
// - Helpers: Bit manipulation
// - Helpers: String
// - Helpers: Formatting
// - Helpers: UTF-8 <> wchar conversions
// - Helpers: ImVec2/ImVec4 operators
// - Helpers: Maths
// - Helpers: Geometry
// - Helper: ImVec1
// - Helper: ImVec2ih
// - Helper: ImRect
// - Helper: ImBitArray
// - Helper: ImBitVector
// - Helper: ImSpan<>, ImSpanAllocator<>
// - Helper: ImPool<>
// - Helper: ImChunkStream<>
// - Helper: ImGuiTextIndex
//-----------------------------------------------------------------------------
// Helpers: Hashing
IMGUI_API ImGuiID ImHashData(const void* data, size_t data_size, ImGuiID seed = 0);
IMGUI_API ImGuiID ImHashStr(const char* data, size_t data_size = 0, ImGuiID seed = 0);
// Helpers: Sorting
#ifndef ImQsort
static inline void ImQsort(void* base, size_t count, size_t size_of_element, int(IMGUI_CDECL *compare_func)(void const*, void const*)) { if (count > 1) qsort(base, count, size_of_element, compare_func); }
#endif
// Helpers: Color Blending
IMGUI_API ImU32 ImAlphaBlendColors(ImU32 col_a, ImU32 col_b);
// Helpers: Bit manipulation
static inline bool ImIsPowerOfTwo(int v) { return v != 0 && (v & (v - 1)) == 0; }
static inline bool ImIsPowerOfTwo(ImU64 v) { return v != 0 && (v & (v - 1)) == 0; }
static inline int ImUpperPowerOfTwo(int v) { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; v++; return v; }
// Helpers: String
IMGUI_API int ImStricmp(const char* str1, const char* str2); // Case insensitive compare.
IMGUI_API int ImStrnicmp(const char* str1, const char* str2, size_t count); // Case insensitive compare to a certain count.
IMGUI_API void ImStrncpy(char* dst, const char* src, size_t count); // Copy to a certain count and always zero terminate (strncpy doesn't).
IMGUI_API char* ImStrdup(const char* str); // Duplicate a string.
IMGUI_API char* ImStrdupcpy(char* dst, size_t* p_dst_size, const char* str); // Copy in provided buffer, recreate buffer if needed.
IMGUI_API const char* ImStrchrRange(const char* str_begin, const char* str_end, char c); // Find first occurrence of 'c' in string range.
IMGUI_API const char* ImStreolRange(const char* str, const char* str_end); // End end-of-line
IMGUI_API const char* ImStristr(const char* haystack, const char* haystack_end, const char* needle, const char* needle_end); // Find a substring in a string range.
IMGUI_API void ImStrTrimBlanks(char* str); // Remove leading and trailing blanks from a buffer.
IMGUI_API const char* ImStrSkipBlank(const char* str); // Find first non-blank character.
IMGUI_API int ImStrlenW(const ImWchar* str); // Computer string length (ImWchar string)
IMGUI_API const ImWchar*ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin); // Find beginning-of-line (ImWchar string)
IM_MSVC_RUNTIME_CHECKS_OFF
static inline char ImToUpper(char c) { return (c >= 'a' && c <= 'z') ? c &= ~32 : c; }
static inline bool ImCharIsBlankA(char c) { return c == ' ' || c == '\t'; }
static inline bool ImCharIsBlankW(unsigned int c) { return c == ' ' || c == '\t' || c == 0x3000; }
IM_MSVC_RUNTIME_CHECKS_RESTORE
// Helpers: Formatting
IMGUI_API int ImFormatString(char* buf, size_t buf_size, const char* fmt, ...) IM_FMTARGS(3);
IMGUI_API int ImFormatStringV(char* buf, size_t buf_size, const char* fmt, va_list args) IM_FMTLIST(3);
IMGUI_API void ImFormatStringToTempBuffer(const char** out_buf, const char** out_buf_end, const char* fmt, ...) IM_FMTARGS(3);
IMGUI_API void ImFormatStringToTempBufferV(const char** out_buf, const char** out_buf_end, const char* fmt, va_list args) IM_FMTLIST(3);
IMGUI_API const char* ImParseFormatFindStart(const char* format);
IMGUI_API const char* ImParseFormatFindEnd(const char* format);
IMGUI_API const char* ImParseFormatTrimDecorations(const char* format, char* buf, size_t buf_size);
IMGUI_API void ImParseFormatSanitizeForPrinting(const char* fmt_in, char* fmt_out, size_t fmt_out_size);
IMGUI_API const char* ImParseFormatSanitizeForScanning(const char* fmt_in, char* fmt_out, size_t fmt_out_size);
IMGUI_API int ImParseFormatPrecision(const char* format, int default_value);
// Helpers: UTF-8 <> wchar conversions
IMGUI_API const char* ImTextCharToUtf8(char out_buf[5], unsigned int c); // return out_buf
IMGUI_API int ImTextStrToUtf8(char* out_buf, int out_buf_size, const ImWchar* in_text, const ImWchar* in_text_end); // return output UTF-8 bytes count
IMGUI_API int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end); // read one character. return input UTF-8 bytes count
IMGUI_API int ImTextStrFromUtf8(ImWchar* out_buf, int out_buf_size, const char* in_text, const char* in_text_end, const char** in_remaining = NULL); // return input UTF-8 bytes count
IMGUI_API int ImTextCountCharsFromUtf8(const char* in_text, const char* in_text_end); // return number of UTF-8 code-points (NOT bytes count)
IMGUI_API int ImTextCountUtf8BytesFromChar(const char* in_text, const char* in_text_end); // return number of bytes to express one char in UTF-8
IMGUI_API int ImTextCountUtf8BytesFromStr(const ImWchar* in_text, const ImWchar* in_text_end); // return number of bytes to express string in UTF-8
IMGUI_API const char* ImTextFindPreviousUtf8Codepoint(const char* in_text_start, const char* in_text_curr); // return previous UTF-8 code-point.
IMGUI_API int ImTextCountLines(const char* in_text, const char* in_text_end); // return number of lines taken by text. trailing carriage return doesn't count as an extra line.
// Helpers: File System
#ifdef IMGUI_DISABLE_FILE_FUNCTIONS
#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
typedef void* ImFileHandle;
static inline ImFileHandle ImFileOpen(const char*, const char*) { return NULL; }
static inline bool ImFileClose(ImFileHandle) { return false; }
static inline ImU64 ImFileGetSize(ImFileHandle) { return (ImU64)-1; }
static inline ImU64 ImFileRead(void*, ImU64, ImU64, ImFileHandle) { return 0; }
static inline ImU64 ImFileWrite(const void*, ImU64, ImU64, ImFileHandle) { return 0; }
#endif
#ifndef IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
typedef FILE* ImFileHandle;
IMGUI_API ImFileHandle ImFileOpen(const char* filename, const char* mode);
IMGUI_API bool ImFileClose(ImFileHandle file);
IMGUI_API ImU64 ImFileGetSize(ImFileHandle file);
IMGUI_API ImU64 ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file);
IMGUI_API ImU64 ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file);
#else
#define IMGUI_DISABLE_TTY_FUNCTIONS // Can't use stdout, fflush if we are not using default file functions
#endif
IMGUI_API void* ImFileLoadToMemory(const char* filename, const char* mode, size_t* out_file_size = NULL, int padding_bytes = 0);
// Helpers: Maths
IM_MSVC_RUNTIME_CHECKS_OFF
// - Wrapper for standard libs functions. (Note that imgui_demo.cpp does _not_ use them to keep the code easy to copy)
#ifndef IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
#define ImFabs(X) fabsf(X)
#define ImSqrt(X) sqrtf(X)
#define ImFmod(X, Y) fmodf((X), (Y))
#define ImCos(X) cosf(X)
#define ImSin(X) sinf(X)
#define ImAcos(X) acosf(X)
#define ImAtan2(Y, X) atan2f((Y), (X))
#define ImAtof(STR) atof(STR)
#define ImCeil(X) ceilf(X)
static inline float ImPow(float x, float y) { return powf(x, y); } // DragBehaviorT/SliderBehaviorT uses ImPow with either float/double and need the precision
static inline double ImPow(double x, double y) { return pow(x, y); }
static inline float ImLog(float x) { return logf(x); } // DragBehaviorT/SliderBehaviorT uses ImLog with either float/double and need the precision
static inline double ImLog(double x) { return log(x); }
static inline int ImAbs(int x) { return x < 0 ? -x : x; }
static inline float ImAbs(float x) { return fabsf(x); }
static inline double ImAbs(double x) { return fabs(x); }
static inline float ImSign(float x) { return (x < 0.0f) ? -1.0f : (x > 0.0f) ? 1.0f : 0.0f; } // Sign operator - returns -1, 0 or 1 based on sign of argument
static inline double ImSign(double x) { return (x < 0.0) ? -1.0 : (x > 0.0) ? 1.0 : 0.0; }
#ifdef IMGUI_ENABLE_SSE
static inline float ImRsqrt(float x) { return _mm_cvtss_f32(_mm_rsqrt_ss(_mm_set_ss(x))); }
#else
static inline float ImRsqrt(float x) { return 1.0f / sqrtf(x); }
#endif
static inline double ImRsqrt(double x) { return 1.0 / sqrt(x); }
#endif
// - ImMin/ImMax/ImClamp/ImLerp/ImSwap are used by widgets which support variety of types: signed/unsigned int/long long float/double
// (Exceptionally using templates here but we could also redefine them for those types)
template<typename T> static inline T ImMin(T lhs, T rhs) { return lhs < rhs ? lhs : rhs; }
template<typename T> static inline T ImMax(T lhs, T rhs) { return lhs >= rhs ? lhs : rhs; }
template<typename T> static inline T ImClamp(T v, T mn, T mx) { return (v < mn) ? mn : (v > mx) ? mx : v; }
template<typename T> static inline T ImLerp(T a, T b, float t) { return (T)(a + (b - a) * t); }
template<typename T> static inline void ImSwap(T& a, T& b) { T tmp = a; a = b; b = tmp; }
template<typename T> static inline T ImAddClampOverflow(T a, T b, T mn, T mx) { if (b < 0 && (a < mn - b)) return mn; if (b > 0 && (a > mx - b)) return mx; return a + b; }
template<typename T> static inline T ImSubClampOverflow(T a, T b, T mn, T mx) { if (b > 0 && (a < mn + b)) return mn; if (b < 0 && (a > mx + b)) return mx; return a - b; }
// - Misc maths helpers
static inline ImVec2 ImMin(const ImVec2& lhs, const ImVec2& rhs) { return ImVec2(lhs.x < rhs.x ? lhs.x : rhs.x, lhs.y < rhs.y ? lhs.y : rhs.y); }
static inline ImVec2 ImMax(const ImVec2& lhs, const ImVec2& rhs) { return ImVec2(lhs.x >= rhs.x ? lhs.x : rhs.x, lhs.y >= rhs.y ? lhs.y : rhs.y); }
static inline ImVec2 ImClamp(const ImVec2& v, const ImVec2&mn, const ImVec2&mx) { return ImVec2((v.x < mn.x) ? mn.x : (v.x > mx.x) ? mx.x : v.x, (v.y < mn.y) ? mn.y : (v.y > mx.y) ? mx.y : v.y); }
static inline ImVec2 ImLerp(const ImVec2& a, const ImVec2& b, float t) { return ImVec2(a.x + (b.x - a.x) * t, a.y + (b.y - a.y) * t); }
static inline ImVec2 ImLerp(const ImVec2& a, const ImVec2& b, const ImVec2& t) { return ImVec2(a.x + (b.x - a.x) * t.x, a.y + (b.y - a.y) * t.y); }
static inline ImVec4 ImLerp(const ImVec4& a, const ImVec4& b, float t) { return ImVec4(a.x + (b.x - a.x) * t, a.y + (b.y - a.y) * t, a.z + (b.z - a.z) * t, a.w + (b.w - a.w) * t); }
static inline float ImSaturate(float f) { return (f < 0.0f) ? 0.0f : (f > 1.0f) ? 1.0f : f; }
static inline float ImLengthSqr(const ImVec2& lhs) { return (lhs.x * lhs.x) + (lhs.y * lhs.y); }
static inline float ImLengthSqr(const ImVec4& lhs) { return (lhs.x * lhs.x) + (lhs.y * lhs.y) + (lhs.z * lhs.z) + (lhs.w * lhs.w); }
static inline float ImInvLength(const ImVec2& lhs, float fail_value) { float d = (lhs.x * lhs.x) + (lhs.y * lhs.y); if (d > 0.0f) return ImRsqrt(d); return fail_value; }
static inline float ImTrunc(float f) { return (float)(int)(f); }
static inline ImVec2 ImTrunc(const ImVec2& v) { return ImVec2((float)(int)(v.x), (float)(int)(v.y)); }
static inline float ImFloor(float f) { return (float)((f >= 0 || (float)(int)f == f) ? (int)f : (int)f - 1); } // Decent replacement for floorf()
static inline ImVec2 ImFloor(const ImVec2& v) { return ImVec2(ImFloor(v.x), ImFloor(v.y)); }
static inline int ImModPositive(int a, int b) { return (a + b) % b; }
static inline float ImDot(const ImVec2& a, const ImVec2& b) { return a.x * b.x + a.y * b.y; }
static inline ImVec2 ImRotate(const ImVec2& v, float cos_a, float sin_a) { return ImVec2(v.x * cos_a - v.y * sin_a, v.x * sin_a + v.y * cos_a); }
static inline float ImLinearSweep(float current, float target, float speed) { if (current < target) return ImMin(current + speed, target); if (current > target) return ImMax(current - speed, target); return current; }
static inline ImVec2 ImMul(const ImVec2& lhs, const ImVec2& rhs) { return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y); }
static inline bool ImIsFloatAboveGuaranteedIntegerPrecision(float f) { return f <= -16777216 || f >= 16777216; }
static inline float ImExponentialMovingAverage(float avg, float sample, int n) { avg -= avg / n; avg += sample / n; return avg; }
IM_MSVC_RUNTIME_CHECKS_RESTORE
// Helpers: Geometry
IMGUI_API ImVec2 ImBezierCubicCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, float t);
IMGUI_API ImVec2 ImBezierCubicClosestPoint(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, int num_segments); // For curves with explicit number of segments
IMGUI_API ImVec2 ImBezierCubicClosestPointCasteljau(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, float tess_tol);// For auto-tessellated curves you can use tess_tol = style.CurveTessellationTol
IMGUI_API ImVec2 ImBezierQuadraticCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, float t);
IMGUI_API ImVec2 ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p);
IMGUI_API bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
IMGUI_API ImVec2 ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
IMGUI_API void ImTriangleBarycentricCoords(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p, float& out_u, float& out_v, float& out_w);
inline float ImTriangleArea(const ImVec2& a, const ImVec2& b, const ImVec2& c) { return ImFabs((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))) * 0.5f; }
inline bool ImTriangleIsClockwise(const ImVec2& a, const ImVec2& b, const ImVec2& c) { return ((b.x - a.x) * (c.y - b.y)) - ((c.x - b.x) * (b.y - a.y)) > 0.0f; }
// Helper: ImVec1 (1D vector)
// (this odd construct is used to facilitate the transition between 1D and 2D, and the maintenance of some branches/patches)
IM_MSVC_RUNTIME_CHECKS_OFF
struct ImVec1
{
float x;
constexpr ImVec1() : x(0.0f) { }
constexpr ImVec1(float _x) : x(_x) { }
};
// Helper: ImVec2ih (2D vector, half-size integer, for long-term packed storage)
struct ImVec2ih
{
short x, y;
constexpr ImVec2ih() : x(0), y(0) {}
constexpr ImVec2ih(short _x, short _y) : x(_x), y(_y) {}
constexpr explicit ImVec2ih(const ImVec2& rhs) : x((short)rhs.x), y((short)rhs.y) {}
};
// Helper: ImRect (2D axis aligned bounding-box)
// NB: we can't rely on ImVec2 math operators being available here!
struct IMGUI_API ImRect
{
ImVec2 Min; // Upper-left
ImVec2 Max; // Lower-right
constexpr ImRect() : Min(0.0f, 0.0f), Max(0.0f, 0.0f) {}
constexpr ImRect(const ImVec2& min, const ImVec2& max) : Min(min), Max(max) {}
constexpr ImRect(const ImVec4& v) : Min(v.x, v.y), Max(v.z, v.w) {}
constexpr ImRect(float x1, float y1, float x2, float y2) : Min(x1, y1), Max(x2, y2) {}
ImVec2 GetCenter() const { return ImVec2((Min.x + Max.x) * 0.5f, (Min.y + Max.y) * 0.5f); }
ImVec2 GetSize() const { return ImVec2(Max.x - Min.x, Max.y - Min.y); }
float GetWidth() const { return Max.x - Min.x; }
float GetHeight() const { return Max.y - Min.y; }
float GetArea() const { return (Max.x - Min.x) * (Max.y - Min.y); }
ImVec2 GetTL() const { return Min; } // Top-left
ImVec2 GetTR() const { return ImVec2(Max.x, Min.y); } // Top-right
ImVec2 GetBL() const { return ImVec2(Min.x, Max.y); } // Bottom-left
ImVec2 GetBR() const { return Max; } // Bottom-right
bool Contains(const ImVec2& p) const { return p.x >= Min.x && p.y >= Min.y && p.x < Max.x && p.y < Max.y; }
bool Contains(const ImRect& r) const { return r.Min.x >= Min.x && r.Min.y >= Min.y && r.Max.x <= Max.x && r.Max.y <= Max.y; }
bool ContainsWithPad(const ImVec2& p, const ImVec2& pad) const { return p.x >= Min.x - pad.x && p.y >= Min.y - pad.y && p.x < Max.x + pad.x && p.y < Max.y + pad.y; }
bool Overlaps(const ImRect& r) const { return r.Min.y < Max.y && r.Max.y > Min.y && r.Min.x < Max.x && r.Max.x > Min.x; }
void Add(const ImVec2& p) { if (Min.x > p.x) Min.x = p.x; if (Min.y > p.y) Min.y = p.y; if (Max.x < p.x) Max.x = p.x; if (Max.y < p.y) Max.y = p.y; }
void Add(const ImRect& r) { if (Min.x > r.Min.x) Min.x = r.Min.x; if (Min.y > r.Min.y) Min.y = r.Min.y; if (Max.x < r.Max.x) Max.x = r.Max.x; if (Max.y < r.Max.y) Max.y = r.Max.y; }
void Expand(const float amount) { Min.x -= amount; Min.y -= amount; Max.x += amount; Max.y += amount; }
void Expand(const ImVec2& amount) { Min.x -= amount.x; Min.y -= amount.y; Max.x += amount.x; Max.y += amount.y; }
void Translate(const ImVec2& d) { Min.x += d.x; Min.y += d.y; Max.x += d.x; Max.y += d.y; }
void TranslateX(float dx) { Min.x += dx; Max.x += dx; }
void TranslateY(float dy) { Min.y += dy; Max.y += dy; }
void ClipWith(const ImRect& r) { Min = ImMax(Min, r.Min); Max = ImMin(Max, r.Max); } // Simple version, may lead to an inverted rectangle, which is fine for Contains/Overlaps test but not for display.
void ClipWithFull(const ImRect& r) { Min = ImClamp(Min, r.Min, r.Max); Max = ImClamp(Max, r.Min, r.Max); } // Full version, ensure both points are fully clipped.
void Floor() { Min.x = IM_TRUNC(Min.x); Min.y = IM_TRUNC(Min.y); Max.x = IM_TRUNC(Max.x); Max.y = IM_TRUNC(Max.y); }
bool IsInverted() const { return Min.x > Max.x || Min.y > Max.y; }
ImVec4 ToVec4() const { return ImVec4(Min.x, Min.y, Max.x, Max.y); }
};
// Helper: ImBitArray
#define IM_BITARRAY_TESTBIT(_ARRAY, _N) ((_ARRAY[(_N) >> 5] & ((ImU32)1 << ((_N) & 31))) != 0) // Macro version of ImBitArrayTestBit(): ensure args have side-effect or are costly!
#define IM_BITARRAY_CLEARBIT(_ARRAY, _N) ((_ARRAY[(_N) >> 5] &= ~((ImU32)1 << ((_N) & 31)))) // Macro version of ImBitArrayClearBit(): ensure args have side-effect or are costly!
inline size_t ImBitArrayGetStorageSizeInBytes(int bitcount) { return (size_t)((bitcount + 31) >> 5) << 2; }
inline void ImBitArrayClearAllBits(ImU32* arr, int bitcount){ memset(arr, 0, ImBitArrayGetStorageSizeInBytes(bitcount)); }
inline bool ImBitArrayTestBit(const ImU32* arr, int n) { ImU32 mask = (ImU32)1 << (n & 31); return (arr[n >> 5] & mask) != 0; }
inline void ImBitArrayClearBit(ImU32* arr, int n) { ImU32 mask = (ImU32)1 << (n & 31); arr[n >> 5] &= ~mask; }
inline void ImBitArraySetBit(ImU32* arr, int n) { ImU32 mask = (ImU32)1 << (n & 31); arr[n >> 5] |= mask; }
inline void ImBitArraySetBitRange(ImU32* arr, int n, int n2) // Works on range [n..n2)
{
n2--;
while (n <= n2)
{
int a_mod = (n & 31);
int b_mod = (n2 > (n | 31) ? 31 : (n2 & 31)) + 1;
ImU32 mask = (ImU32)(((ImU64)1 << b_mod) - 1) & ~(ImU32)(((ImU64)1 << a_mod) - 1);
arr[n >> 5] |= mask;
n = (n + 32) & ~31;
}
}
typedef ImU32* ImBitArrayPtr; // Name for use in structs
// Helper: ImBitArray class (wrapper over ImBitArray functions)
// Store 1-bit per value.
template<int BITCOUNT, int OFFSET = 0>
struct ImBitArray
{
ImU32 Storage[(BITCOUNT + 31) >> 5];
ImBitArray() { ClearAllBits(); }
void ClearAllBits() { memset(Storage, 0, sizeof(Storage)); }
void SetAllBits() { memset(Storage, 255, sizeof(Storage)); }
bool TestBit(int n) const { n += OFFSET; IM_ASSERT(n >= 0 && n < BITCOUNT); return IM_BITARRAY_TESTBIT(Storage, n); }
void SetBit(int n) { n += OFFSET; IM_ASSERT(n >= 0 && n < BITCOUNT); ImBitArraySetBit(Storage, n); }
void ClearBit(int n) { n += OFFSET; IM_ASSERT(n >= 0 && n < BITCOUNT); ImBitArrayClearBit(Storage, n); }
void SetBitRange(int n, int n2) { n += OFFSET; n2 += OFFSET; IM_ASSERT(n >= 0 && n < BITCOUNT && n2 > n && n2 <= BITCOUNT); ImBitArraySetBitRange(Storage, n, n2); } // Works on range [n..n2)
bool operator[](int n) const { n += OFFSET; IM_ASSERT(n >= 0 && n < BITCOUNT); return IM_BITARRAY_TESTBIT(Storage, n); }
};
// Helper: ImBitVector
// Store 1-bit per value.
struct IMGUI_API ImBitVector
{
ImVector<ImU32> Storage;
void Create(int sz) { Storage.resize((sz + 31) >> 5); memset(Storage.Data, 0, (size_t)Storage.Size * sizeof(Storage.Data[0])); }
void Clear() { Storage.clear(); }
bool TestBit(int n) const { IM_ASSERT(n < (Storage.Size << 5)); return IM_BITARRAY_TESTBIT(Storage.Data, n); }
void SetBit(int n) { IM_ASSERT(n < (Storage.Size << 5)); ImBitArraySetBit(Storage.Data, n); }
void ClearBit(int n) { IM_ASSERT(n < (Storage.Size << 5)); ImBitArrayClearBit(Storage.Data, n); }
};
IM_MSVC_RUNTIME_CHECKS_RESTORE
// Helper: ImSpan<>
// Pointing to a span of data we don't own.
template<typename T>
struct ImSpan
{
T* Data;
T* DataEnd;
// Constructors, destructor
inline ImSpan() { Data = DataEnd = NULL; }
inline ImSpan(T* data, int size) { Data = data; DataEnd = data + size; }
inline ImSpan(T* data, T* data_end) { Data = data; DataEnd = data_end; }
inline void set(T* data, int size) { Data = data; DataEnd = data + size; }
inline void set(T* data, T* data_end) { Data = data; DataEnd = data_end; }
inline int size() const { return (int)(ptrdiff_t)(DataEnd - Data); }
inline int size_in_bytes() const { return (int)(ptrdiff_t)(DataEnd - Data) * (int)sizeof(T); }
inline T& operator[](int i) { T* p = Data + i; IM_ASSERT(p >= Data && p < DataEnd); return *p; }
inline const T& operator[](int i) const { const T* p = Data + i; IM_ASSERT(p >= Data && p < DataEnd); return *p; }
inline T* begin() { return Data; }
inline const T* begin() const { return Data; }
inline T* end() { return DataEnd; }
inline const T* end() const { return DataEnd; }
// Utilities
inline int index_from_ptr(const T* it) const { IM_ASSERT(it >= Data && it < DataEnd); const ptrdiff_t off = it - Data; return (int)off; }
};
// Helper: ImSpanAllocator<>
// Facilitate storing multiple chunks into a single large block (the "arena")
// - Usage: call Reserve() N times, allocate GetArenaSizeInBytes() worth, pass it to SetArenaBasePtr(), call GetSpan() N times to retrieve the aligned ranges.
template<int CHUNKS>
struct ImSpanAllocator
{
char* BasePtr;
int CurrOff;
int CurrIdx;
int Offsets[CHUNKS];
int Sizes[CHUNKS];
ImSpanAllocator() { memset(this, 0, sizeof(*this)); }
inline void Reserve(int n, size_t sz, int a=4) { IM_ASSERT(n == CurrIdx && n < CHUNKS); CurrOff = IM_MEMALIGN(CurrOff, a); Offsets[n] = CurrOff; Sizes[n] = (int)sz; CurrIdx++; CurrOff += (int)sz; }
inline int GetArenaSizeInBytes() { return CurrOff; }
inline void SetArenaBasePtr(void* base_ptr) { BasePtr = (char*)base_ptr; }
inline void* GetSpanPtrBegin(int n) { IM_ASSERT(n >= 0 && n < CHUNKS && CurrIdx == CHUNKS); return (void*)(BasePtr + Offsets[n]); }
inline void* GetSpanPtrEnd(int n) { IM_ASSERT(n >= 0 && n < CHUNKS && CurrIdx == CHUNKS); return (void*)(BasePtr + Offsets[n] + Sizes[n]); }
template<typename T>
inline void GetSpan(int n, ImSpan<T>* span) { span->set((T*)GetSpanPtrBegin(n), (T*)GetSpanPtrEnd(n)); }
};
// Helper: ImPool<>
// Basic keyed storage for contiguous instances, slow/amortized insertion, O(1) indexable, O(Log N) queries by ID over a dense/hot buffer,
// Honor constructor/destructor. Add/remove invalidate all pointers. Indexes have the same lifetime as the associated object.
typedef int ImPoolIdx;
template<typename T>
struct ImPool
{
ImVector<T> Buf; // Contiguous data
ImGuiStorage Map; // ID->Index
ImPoolIdx FreeIdx; // Next free idx to use
ImPoolIdx AliveCount; // Number of active/alive items (for display purpose)
ImPool() { FreeIdx = AliveCount = 0; }
~ImPool() { Clear(); }
T* GetByKey(ImGuiID key) { int idx = Map.GetInt(key, -1); return (idx != -1) ? &Buf[idx] : NULL; }
T* GetByIndex(ImPoolIdx n) { return &Buf[n]; }
ImPoolIdx GetIndex(const T* p) const { IM_ASSERT(p >= Buf.Data && p < Buf.Data + Buf.Size); return (ImPoolIdx)(p - Buf.Data); }
T* GetOrAddByKey(ImGuiID key) { int* p_idx = Map.GetIntRef(key, -1); if (*p_idx != -1) return &Buf[*p_idx]; *p_idx = FreeIdx; return Add(); }
bool Contains(const T* p) const { return (p >= Buf.Data && p < Buf.Data + Buf.Size); }
void Clear() { for (int n = 0; n < Map.Data.Size; n++) { int idx = Map.Data[n].val_i; if (idx != -1) Buf[idx].~T(); } Map.Clear(); Buf.clear(); FreeIdx = AliveCount = 0; }
T* Add() { int idx = FreeIdx; if (idx == Buf.Size) { Buf.resize(Buf.Size + 1); FreeIdx++; } else { FreeIdx = *(int*)&Buf[idx]; } IM_PLACEMENT_NEW(&Buf[idx]) T(); AliveCount++; return &Buf[idx]; }
void Remove(ImGuiID key, const T* p) { Remove(key, GetIndex(p)); }
void Remove(ImGuiID key, ImPoolIdx idx) { Buf[idx].~T(); *(int*)&Buf[idx] = FreeIdx; FreeIdx = idx; Map.SetInt(key, -1); AliveCount--; }
void Reserve(int capacity) { Buf.reserve(capacity); Map.Data.reserve(capacity); }
// To iterate a ImPool: for (int n = 0; n < pool.GetMapSize(); n++) if (T* t = pool.TryGetMapData(n)) { ... }
// Can be avoided if you know .Remove() has never been called on the pool, or AliveCount == GetMapSize()
int GetAliveCount() const { return AliveCount; } // Number of active/alive items in the pool (for display purpose)
int GetBufSize() const { return Buf.Size; }
int GetMapSize() const { return Map.Data.Size; } // It is the map we need iterate to find valid items, since we don't have "alive" storage anywhere
T* TryGetMapData(ImPoolIdx n) { int idx = Map.Data[n].val_i; if (idx == -1) return NULL; return GetByIndex(idx); }
};
// Helper: ImChunkStream<>
// Build and iterate a contiguous stream of variable-sized structures.
// This is used by Settings to store persistent data while reducing allocation count.
// We store the chunk size first, and align the final size on 4 bytes boundaries.
// The tedious/zealous amount of casting is to avoid -Wcast-align warnings.
template<typename T>
struct ImChunkStream
{
ImVector<char> Buf;
void clear() { Buf.clear(); }
bool empty() const { return Buf.Size == 0; }
int size() const { return Buf.Size; }
T* alloc_chunk(size_t sz) { size_t HDR_SZ = 4; sz = IM_MEMALIGN(HDR_SZ + sz, 4u); int off = Buf.Size; Buf.resize(off + (int)sz); ((int*)(void*)(Buf.Data + off))[0] = (int)sz; return (T*)(void*)(Buf.Data + off + (int)HDR_SZ); }
T* begin() { size_t HDR_SZ = 4; if (!Buf.Data) return NULL; return (T*)(void*)(Buf.Data + HDR_SZ); }
T* next_chunk(T* p) { size_t HDR_SZ = 4; IM_ASSERT(p >= begin() && p < end()); p = (T*)(void*)((char*)(void*)p + chunk_size(p)); if (p == (T*)(void*)((char*)end() + HDR_SZ)) return (T*)0; IM_ASSERT(p < end()); return p; }
int chunk_size(const T* p) { return ((const int*)p)[-1]; }
T* end() { return (T*)(void*)(Buf.Data + Buf.Size); }
int offset_from_ptr(const T* p) { IM_ASSERT(p >= begin() && p < end()); const ptrdiff_t off = (const char*)p - Buf.Data; return (int)off; }
T* ptr_from_offset(int off) { IM_ASSERT(off >= 4 && off < Buf.Size); return (T*)(void*)(Buf.Data + off); }
void swap(ImChunkStream<T>& rhs) { rhs.Buf.swap(Buf); }
};
// Helper: ImGuiTextIndex<>
// Maintain a line index for a text buffer. This is a strong candidate to be moved into the public API.
struct ImGuiTextIndex
{
ImVector<int> LineOffsets;
int EndOffset = 0; // Because we don't own text buffer we need to maintain EndOffset (may bake in LineOffsets?)
void clear() { LineOffsets.clear(); EndOffset = 0; }
int size() { return LineOffsets.Size; }
const char* get_line_begin(const char* base, int n) { return base + LineOffsets[n]; }
const char* get_line_end(const char* base, int n) { return base + (n + 1 < LineOffsets.Size ? (LineOffsets[n + 1] - 1) : EndOffset); }
void append(const char* base, int old_size, int new_size);
};
//-----------------------------------------------------------------------------
// [SECTION] ImDrawList support
//-----------------------------------------------------------------------------
// ImDrawList: Helper function to calculate a circle's segment count given its radius and a "maximum error" value.
// Estimation of number of circle segment based on error is derived using method described in https://stackoverflow.com/a/2244088/15194693
// Number of segments (N) is calculated using equation:
// N = ceil ( pi / acos(1 - error / r) ) where r > 0, error <= r
// Our equation is significantly simpler that one in the post thanks for choosing segment that is
// perpendicular to X axis. Follow steps in the article from this starting condition and you will
// will get this result.
//
// Rendering circles with an odd number of segments, while mathematically correct will produce
// asymmetrical results on the raster grid. Therefore we're rounding N to next even number (7->8, 8->8, 9->10 etc.)
#define IM_ROUNDUP_TO_EVEN(_V) ((((_V) + 1) / 2) * 2)
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN 4
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX 512
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(_RAD,_MAXERROR) ImClamp(IM_ROUNDUP_TO_EVEN((int)ImCeil(IM_PI / ImAcos(1 - ImMin((_MAXERROR), (_RAD)) / (_RAD)))), IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)
// Raw equation from IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC rewritten for 'r' and 'error'.
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC_R(_N,_MAXERROR) ((_MAXERROR) / (1 - ImCos(IM_PI / ImMax((float)(_N), IM_PI))))
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC_ERROR(_N,_RAD) ((1 - ImCos(IM_PI / ImMax((float)(_N), IM_PI))) / (_RAD))
// ImDrawList: Lookup table size for adaptive arc drawing, cover full circle.
#ifndef IM_DRAWLIST_ARCFAST_TABLE_SIZE
#define IM_DRAWLIST_ARCFAST_TABLE_SIZE 48 // Number of samples in lookup table.
#endif
#define IM_DRAWLIST_ARCFAST_SAMPLE_MAX IM_DRAWLIST_ARCFAST_TABLE_SIZE // Sample index _PathArcToFastEx() for 360 angle.
// Data shared between all ImDrawList instances
// You may want to create your own instance of this if you want to use ImDrawList completely without ImGui. In that case, watch out for future changes to this structure.
struct IMGUI_API ImDrawListSharedData
{
ImVec2 TexUvWhitePixel; // UV of white pixel in the atlas
ImFont* Font; // Current/default font (optional, for simplified AddText overload)
float FontSize; // Current/default font size (optional, for simplified AddText overload)
float CurveTessellationTol; // Tessellation tolerance when using PathBezierCurveTo()
float CircleSegmentMaxError; // Number of circle segments to use per pixel of radius for AddCircle() etc
ImVec4 ClipRectFullscreen; // Value for PushClipRectFullscreen()
ImDrawListFlags InitialFlags; // Initial flags at the beginning of the frame (it is possible to alter flags on a per-drawlist basis afterwards)
// [Internal] Temp write buffer
ImVector<ImVec2> TempBuffer;
// [Internal] Lookup tables
ImVec2 ArcFastVtx[IM_DRAWLIST_ARCFAST_TABLE_SIZE]; // Sample points on the quarter of the circle.
float ArcFastRadiusCutoff; // Cutoff radius after which arc drawing will fallback to slower PathArcTo()
ImU8 CircleSegmentCounts[64]; // Precomputed segment count for given radius before we calculate it dynamically (to avoid calculation overhead)
const ImVec4* TexUvLines; // UV of anti-aliased lines in the atlas
ImDrawListSharedData();
void SetCircleTessellationMaxError(float max_error);
};
struct ImDrawDataBuilder
{
ImVector<ImDrawList*>* Layers[2]; // Pointers to global layers for: regular, tooltip. LayersP[0] is owned by DrawData.
ImVector<ImDrawList*> LayerData1;
ImDrawDataBuilder() { memset(this, 0, sizeof(*this)); }
};
//-----------------------------------------------------------------------------
// [SECTION] Data types support
//-----------------------------------------------------------------------------
struct ImGuiDataVarInfo
{
ImGuiDataType Type;
ImU32 Count; // 1+
ImU32 Offset; // Offset in parent structure
void* GetVarPtr(void* parent) const { return (void*)((unsigned char*)parent + Offset); }
};
struct ImGuiDataTypeStorage
{
ImU8 Data[8]; // Opaque storage to fit any data up to ImGuiDataType_COUNT
};
// Type information associated to one ImGuiDataType. Retrieve with DataTypeGetInfo().
struct ImGuiDataTypeInfo
{
size_t Size; // Size in bytes
const char* Name; // Short descriptive name for the type, for debugging
const char* PrintFmt; // Default printf format for the type
const char* ScanFmt; // Default scanf format for the type
};
// Extend ImGuiDataType_
enum ImGuiDataTypePrivate_
{
ImGuiDataType_String = ImGuiDataType_COUNT + 1,
ImGuiDataType_Pointer,
ImGuiDataType_ID,
};
//-----------------------------------------------------------------------------
// [SECTION] Widgets support: flags, enums, data structures
//-----------------------------------------------------------------------------
// Flags used by upcoming items
// - input: PushItemFlag() manipulates g.CurrentItemFlags, ItemAdd() calls may add extra flags.
// - output: stored in g.LastItemData.InFlags
// Current window shared by all windows.
// This is going to be exposed in imgui.h when stabilized enough.
enum ImGuiItemFlags_
{
// Controlled by user
ImGuiItemFlags_None = 0,
ImGuiItemFlags_NoTabStop = 1 << 0, // false // Disable keyboard tabbing. This is a "lighter" version of ImGuiItemFlags_NoNav.
ImGuiItemFlags_ButtonRepeat = 1 << 1, // false // Button() will return true multiple times based on io.KeyRepeatDelay and io.KeyRepeatRate settings.
ImGuiItemFlags_Disabled = 1 << 2, // false // Disable interactions but doesn't affect visuals. See BeginDisabled()/EndDisabled(). See github.com/ocornut/imgui/issues/211
ImGuiItemFlags_NoNav = 1 << 3, // false // Disable any form of focusing (keyboard/gamepad directional navigation and SetKeyboardFocusHere() calls)
ImGuiItemFlags_NoNavDefaultFocus = 1 << 4, // false // Disable item being a candidate for default focus (e.g. used by title bar items)
ImGuiItemFlags_SelectableDontClosePopup = 1 << 5, // false // Disable MenuItem/Selectable() automatically closing their popup window
ImGuiItemFlags_MixedValue = 1 << 6, // false // [BETA] Represent a mixed/indeterminate value, generally multi-selection where values differ. Currently only supported by Checkbox() (later should support all sorts of widgets)
ImGuiItemFlags_ReadOnly = 1 << 7, // false // [ALPHA] Allow hovering interactions but underlying value is not changed.
ImGuiItemFlags_NoWindowHoverableCheck = 1 << 8, // false // Disable hoverable check in ItemHoverable()
ImGuiItemFlags_AllowOverlap = 1 << 9, // false // Allow being overlapped by another widget. Not-hovered to Hovered transition deferred by a frame.
// Controlled by widget code
ImGuiItemFlags_Inputable = 1 << 10, // false // [WIP] Auto-activate input mode when tab focused. Currently only used and supported by a few items before it becomes a generic feature.
ImGuiItemFlags_HasSelectionUserData = 1 << 11, // false // Set by SetNextItemSelectionUserData()
};
// Status flags for an already submitted item
// - output: stored in g.LastItemData.StatusFlags
enum ImGuiItemStatusFlags_
{
ImGuiItemStatusFlags_None = 0,
ImGuiItemStatusFlags_HoveredRect = 1 << 0, // Mouse position is within item rectangle (does NOT mean that the window is in correct z-order and can be hovered!, this is only one part of the most-common IsItemHovered test)
ImGuiItemStatusFlags_HasDisplayRect = 1 << 1, // g.LastItemData.DisplayRect is valid
ImGuiItemStatusFlags_Edited = 1 << 2, // Value exposed by item was edited in the current frame (should match the bool return value of most widgets)
ImGuiItemStatusFlags_ToggledSelection = 1 << 3, // Set when Selectable(), TreeNode() reports toggling a selection. We can't report "Selected", only state changes, in order to easily handle clipping with less issues.
ImGuiItemStatusFlags_ToggledOpen = 1 << 4, // Set when TreeNode() reports toggling their open state.
ImGuiItemStatusFlags_HasDeactivated = 1 << 5, // Set if the widget/group is able to provide data for the ImGuiItemStatusFlags_Deactivated flag.
ImGuiItemStatusFlags_Deactivated = 1 << 6, // Only valid if ImGuiItemStatusFlags_HasDeactivated is set.
ImGuiItemStatusFlags_HoveredWindow = 1 << 7, // Override the HoveredWindow test to allow cross-window hover testing.
ImGuiItemStatusFlags_Visible = 1 << 8, // [WIP] Set when item is overlapping the current clipping rectangle (Used internally. Please don't use yet: API/system will change as we refactor Itemadd()).
ImGuiItemStatusFlags_HasClipRect = 1 << 9, // g.LastItemData.ClipRect is valid.
ImGuiItemStatusFlags_HasShortcut = 1 << 10, // g.LastItemData.Shortcut valid. Set by SetNextItemShortcut() -> ItemAdd().
// Additional status + semantic for ImGuiTestEngine
#ifdef IMGUI_ENABLE_TEST_ENGINE
ImGuiItemStatusFlags_Openable = 1 << 20, // Item is an openable (e.g. TreeNode)
ImGuiItemStatusFlags_Opened = 1 << 21, // Opened status
ImGuiItemStatusFlags_Checkable = 1 << 22, // Item is a checkable (e.g. CheckBox, MenuItem)
ImGuiItemStatusFlags_Checked = 1 << 23, // Checked status
ImGuiItemStatusFlags_Inputable = 1 << 24, // Item is a text-inputable (e.g. InputText, SliderXXX, DragXXX)
#endif
};
// Extend ImGuiHoveredFlags_
enum ImGuiHoveredFlagsPrivate_
{
ImGuiHoveredFlags_DelayMask_ = ImGuiHoveredFlags_DelayNone | ImGuiHoveredFlags_DelayShort | ImGuiHoveredFlags_DelayNormal | ImGuiHoveredFlags_NoSharedDelay,
ImGuiHoveredFlags_AllowedMaskForIsWindowHovered = ImGuiHoveredFlags_ChildWindows | ImGuiHoveredFlags_RootWindow | ImGuiHoveredFlags_AnyWindow | ImGuiHoveredFlags_NoPopupHierarchy | ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem | ImGuiHoveredFlags_ForTooltip | ImGuiHoveredFlags_Stationary,
ImGuiHoveredFlags_AllowedMaskForIsItemHovered = ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem | ImGuiHoveredFlags_AllowWhenOverlapped | ImGuiHoveredFlags_AllowWhenDisabled | ImGuiHoveredFlags_NoNavOverride | ImGuiHoveredFlags_ForTooltip | ImGuiHoveredFlags_Stationary | ImGuiHoveredFlags_DelayMask_,
};
// Extend ImGuiInputTextFlags_
enum ImGuiInputTextFlagsPrivate_
{
// [Internal]
ImGuiInputTextFlags_Multiline = 1 << 26, // For internal use by InputTextMultiline()
ImGuiInputTextFlags_NoMarkEdited = 1 << 27, // For internal use by functions using InputText() before reformatting data
ImGuiInputTextFlags_MergedItem = 1 << 28, // For internal use by TempInputText(), will skip calling ItemAdd(). Require bounding-box to strictly match.
ImGuiInputTextFlags_LocalizeDecimalPoint= 1 << 29, // For internal use by InputScalar() and TempInputScalar()
};
// Extend ImGuiButtonFlags_
enum ImGuiButtonFlagsPrivate_
{
ImGuiButtonFlags_PressedOnClick = 1 << 4, // return true on click (mouse down event)
ImGuiButtonFlags_PressedOnClickRelease = 1 << 5, // [Default] return true on click + release on same item <-- this is what the majority of Button are using
ImGuiButtonFlags_PressedOnClickReleaseAnywhere = 1 << 6, // return true on click + release even if the release event is not done while hovering the item
ImGuiButtonFlags_PressedOnRelease = 1 << 7, // return true on release (default requires click+release)
ImGuiButtonFlags_PressedOnDoubleClick = 1 << 8, // return true on double-click (default requires click+release)
ImGuiButtonFlags_PressedOnDragDropHold = 1 << 9, // return true when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
ImGuiButtonFlags_Repeat = 1 << 10, // hold to repeat
ImGuiButtonFlags_FlattenChildren = 1 << 11, // allow interactions even if a child window is overlapping
ImGuiButtonFlags_AllowOverlap = 1 << 12, // require previous frame HoveredId to either match id or be null before being usable.
ImGuiButtonFlags_DontClosePopups = 1 << 13, // disable automatically closing parent popup on press // [UNUSED]
//ImGuiButtonFlags_Disabled = 1 << 14, // disable interactions -> use BeginDisabled() or ImGuiItemFlags_Disabled
ImGuiButtonFlags_AlignTextBaseLine = 1 << 15, // vertically align button to match text baseline - ButtonEx() only // FIXME: Should be removed and handled by SmallButton(), not possible currently because of DC.CursorPosPrevLine
ImGuiButtonFlags_NoKeyModifiers = 1 << 16, // disable mouse interaction if a key modifier is held
ImGuiButtonFlags_NoHoldingActiveId = 1 << 17, // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
ImGuiButtonFlags_NoNavFocus = 1 << 18, // don't override navigation focus when activated (FIXME: this is essentially used every time an item uses ImGuiItemFlags_NoNav, but because legacy specs don't requires LastItemData to be set ButtonBehavior(), we can't poll g.LastItemData.InFlags)
ImGuiButtonFlags_NoHoveredOnFocus = 1 << 19, // don't report as hovered when nav focus is on this item
ImGuiButtonFlags_NoSetKeyOwner = 1 << 20, // don't set key/input owner on the initial click (note: mouse buttons are keys! often, the key in question will be ImGuiKey_MouseLeft!)
ImGuiButtonFlags_NoTestKeyOwner = 1 << 21, // don't test key/input owner when polling the key (note: mouse buttons are keys! often, the key in question will be ImGuiKey_MouseLeft!)
ImGuiButtonFlags_PressedOnMask_ = ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClickReleaseAnywhere | ImGuiButtonFlags_PressedOnRelease | ImGuiButtonFlags_PressedOnDoubleClick | ImGuiButtonFlags_PressedOnDragDropHold,
ImGuiButtonFlags_PressedOnDefault_ = ImGuiButtonFlags_PressedOnClickRelease,
};
// Extend ImGuiComboFlags_
enum ImGuiComboFlagsPrivate_
{
ImGuiComboFlags_CustomPreview = 1 << 20, // enable BeginComboPreview()
};
// Extend ImGuiSliderFlags_
enum ImGuiSliderFlagsPrivate_
{
ImGuiSliderFlags_Vertical = 1 << 20, // Should this slider be orientated vertically?
ImGuiSliderFlags_ReadOnly = 1 << 21, // Consider using g.NextItemData.ItemFlags |= ImGuiItemFlags_ReadOnly instead.
};
// Extend ImGuiSelectableFlags_
enum ImGuiSelectableFlagsPrivate_
{
// NB: need to be in sync with last value of ImGuiSelectableFlags_
ImGuiSelectableFlags_NoHoldingActiveID = 1 << 20,
ImGuiSelectableFlags_SelectOnNav = 1 << 21, // (WIP) Auto-select when moved into. This is not exposed in public API as to handle multi-select and modifiers we will need user to explicitly control focus scope. May be replaced with a BeginSelection() API.
ImGuiSelectableFlags_SelectOnClick = 1 << 22, // Override button behavior to react on Click (default is Click+Release)
ImGuiSelectableFlags_SelectOnRelease = 1 << 23, // Override button behavior to react on Release (default is Click+Release)
ImGuiSelectableFlags_SpanAvailWidth = 1 << 24, // Span all avail width even if we declared less for layout purpose. FIXME: We may be able to remove this (added in 6251d379, 2bcafc86 for menus)
ImGuiSelectableFlags_SetNavIdOnHover = 1 << 25, // Set Nav/Focus ID on mouse hover (used by MenuItem)
ImGuiSelectableFlags_NoPadWithHalfSpacing = 1 << 26, // Disable padding each side with ItemSpacing * 0.5f
ImGuiSelectableFlags_NoSetKeyOwner = 1 << 27, // Don't set key/input owner on the initial click (note: mouse buttons are keys! often, the key in question will be ImGuiKey_MouseLeft!)
};
// Extend ImGuiTreeNodeFlags_
enum ImGuiTreeNodeFlagsPrivate_
{
ImGuiTreeNodeFlags_ClipLabelForTrailingButton = 1 << 20,
ImGuiTreeNodeFlags_UpsideDownArrow = 1 << 21,// (FIXME-WIP) Turn Down arrow into an Up arrow, but reversed trees (#6517)
};
enum ImGuiSeparatorFlags_
{
ImGuiSeparatorFlags_None = 0,
ImGuiSeparatorFlags_Horizontal = 1 << 0, // Axis default to current layout type, so generally Horizontal unless e.g. in a menu bar
ImGuiSeparatorFlags_Vertical = 1 << 1,
ImGuiSeparatorFlags_SpanAllColumns = 1 << 2, // Make separator cover all columns of a legacy Columns() set.
};
// Flags for FocusWindow(). This is not called ImGuiFocusFlags to avoid confusion with public-facing ImGuiFocusedFlags.
// FIXME: Once we finishing replacing more uses of GetTopMostPopupModal()+IsWindowWithinBeginStackOf()
// and FindBlockingModal() with this, we may want to change the flag to be opt-out instead of opt-in.
enum ImGuiFocusRequestFlags_
{
ImGuiFocusRequestFlags_None = 0,
ImGuiFocusRequestFlags_RestoreFocusedChild = 1 << 0, // Find last focused child (if any) and focus it instead.
ImGuiFocusRequestFlags_UnlessBelowModal = 1 << 1, // Do not set focus if the window is below a modal.
};
enum ImGuiTextFlags_
{
ImGuiTextFlags_None = 0,
ImGuiTextFlags_NoWidthForLargeClippedText = 1 << 0,
};
enum ImGuiTooltipFlags_
{
ImGuiTooltipFlags_None = 0,
ImGuiTooltipFlags_OverridePrevious = 1 << 1, // Clear/ignore previously submitted tooltip (defaults to append)
};
// FIXME: this is in development, not exposed/functional as a generic feature yet.
// Horizontal/Vertical enums are fixed to 0/1 so they may be used to index ImVec2
enum ImGuiLayoutType_