Added ImAtof, ImCeil, ImFloorStd to IMGUI_DISABLE_MATH_FUNCTIONS for consistency. Configuration comments.

CHANGELOG.txt

@@ -81,7 +81,7 @@ Other Changes:
 - Fonts: When building font atlas, glyphs that are missing in the fonts are not using the glyph slot to render a dummy/default glyph. Saves space and allow merging fonts with 
   overlapping font ranges such as FontAwesome5 which split out the Brands separately from the Solid fonts. (#1703, #1671)
 - Misc: Added IMGUI_CHECKVERSION() macro to compare version string and data structure sizes in order to catch issues with mismatching compilation unit settings. (#1695, #1769)
-- Misc: Added IMGUI_DISABLE_MATH_FUNCTIONS in imconfig.h to make it slightly easier to redefine wrappers to std maths functions such as fabsf(), fmodf(), etc.
+- Misc: Added IMGUI_DISABLE_MATH_FUNCTIONS in imconfig.h to make it slightly easier to redefine wrappers to std maths functions such as fabsf(), fmodf(), cosf(), etc.
 - Misc: Fix to allow compiling in unity builds where stb_rectpack/stb_truetype may be already included in the same compilation unit.
 - Demo: Simple Overlay: Added a context menu item to enable freely moving the window. 
 - Demo: Added demo for DragScalar(), InputScalar(), SliderScalar(). (#643)

imconfig.h

@@ -15,6 +15,7 @@
 
 //---- Define assertion handler. Defaults to calling assert().
 //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
+//#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
 
 //---- Define attributes of all API symbols declarations, e.g. for DLL under Windows.
 //#define IMGUI_API __declspec( dllexport )
@@ -30,8 +31,8 @@
 //---- Don't implement some functions to reduce linkage requirements.
 //#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc.
 //#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] Don't implement default IME handler. Won't use and link with ImmGetContext/ImmSetCompositionWindow.
-//#define IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS             // Don't implement ImFormatString(), ImFormatStringV() so you can reimplement them yourself.      
+//#define IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS             // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself if you don't want to link with vsnprintf.      
-//#define IMGUI_DISABLE_MATH_FUNCTIONS                      // Don't implement ImFabs(), ImSqrt(), ImPow(), ImFmod() so you can reimplement them yourself.
+//#define IMGUI_DISABLE_MATH_FUNCTIONS                      // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 wrapper so you can implement them yourself. Declare your prototypes in imconfig.h.
 //#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free(). You will need to call ImGui::SetAllocatorFunctions().
 
 //---- Include imgui_user.h at the end of imgui.h as a convenience

imgui.cpp

@@ -8776,7 +8776,7 @@ static inline TYPE RoundScalarWithFormat(const char* format, ImGuiDataType data_
     while (*p == ' ')
         p++;
     if (data_type == ImGuiDataType_Float || data_type == ImGuiDataType_Double)
-        v = (TYPE)atof(p);
+        v = (TYPE)ImAtof(p);
     else
         ImAtoi(p, (SIGNEDTYPE*)&v);
     return v;
@@ -12180,13 +12180,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             if (initial_dist2 >= (wheel_r_inner-1)*(wheel_r_inner-1) && initial_dist2 <= (wheel_r_outer+1)*(wheel_r_outer+1))
             {
                 // Interactive with Hue wheel
-                H = atan2f(current_off.y, current_off.x) / IM_PI*0.5f;
+                H = ImAtan2(current_off.y, current_off.x) / IM_PI*0.5f;
                 if (H < 0.0f)
                     H += 1.0f;
                 value_changed = value_changed_h = true;
             }
-            float cos_hue_angle = cosf(-H * 2.0f * IM_PI);
+            float cos_hue_angle = ImCos(-H * 2.0f * IM_PI);
-            float sin_hue_angle = sinf(-H * 2.0f * IM_PI);
+            float sin_hue_angle = ImSin(-H * 2.0f * IM_PI);
             if (ImTriangleContainsPoint(triangle_pa, triangle_pb, triangle_pc, ImRotate(initial_off, cos_hue_angle, sin_hue_angle)))
             {
                 // Interacting with SV triangle
@@ -12332,14 +12332,14 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             const int vert_end_idx = draw_list->VtxBuffer.Size;
 
             // Paint colors over existing vertices
-            ImVec2 gradient_p0(wheel_center.x + cosf(a0) * wheel_r_inner, wheel_center.y + sinf(a0) * wheel_r_inner);
+            ImVec2 gradient_p0(wheel_center.x + ImCos(a0) * wheel_r_inner, wheel_center.y + ImSin(a0) * wheel_r_inner);
-            ImVec2 gradient_p1(wheel_center.x + cosf(a1) * wheel_r_inner, wheel_center.y + sinf(a1) * wheel_r_inner);
+            ImVec2 gradient_p1(wheel_center.x + ImCos(a1) * wheel_r_inner, wheel_center.y + ImSin(a1) * wheel_r_inner);
             ShadeVertsLinearColorGradientKeepAlpha(draw_list->VtxBuffer.Data + vert_start_idx, draw_list->VtxBuffer.Data + vert_end_idx, gradient_p0, gradient_p1, hue_colors[n], hue_colors[n+1]);
         }
 
         // Render Cursor + preview on Hue Wheel
-        float cos_hue_angle = cosf(H * 2.0f * IM_PI);
+        float cos_hue_angle = ImCos(H * 2.0f * IM_PI);
-        float sin_hue_angle = sinf(H * 2.0f * IM_PI);
+        float sin_hue_angle = ImSin(H * 2.0f * IM_PI);
         ImVec2 hue_cursor_pos(wheel_center.x + cos_hue_angle * (wheel_r_inner+wheel_r_outer)*0.5f, wheel_center.y + sin_hue_angle * (wheel_r_inner+wheel_r_outer)*0.5f);
         float hue_cursor_rad = value_changed_h ? wheel_thickness * 0.65f : wheel_thickness * 0.55f;
         int hue_cursor_segments = ImClamp((int)(hue_cursor_rad / 1.4f), 9, 32);

imgui_draw.cpp

@@ -113,6 +113,8 @@ namespace IMGUI_STB_NAMESPACE
 #define STBTT_sqrt(x)       ImSqrt(x)
 #define STBTT_pow(x,y)      ImPow(x,y)
 #define STBTT_fabs(x)       ImFabs(x)
+#define STBTT_ifloor(x)     ((int)ImFloorStd(x))
+#define STBTT_iceil(x)      ((int)ImCeil(x))
 #define STBTT_STATIC
 #define STB_TRUETYPE_IMPLEMENTATION
 #else
@@ -309,7 +311,7 @@ ImDrawListSharedData::ImDrawListSharedData()
     for (int i = 0; i < IM_ARRAYSIZE(CircleVtx12); i++)
     {
         const float a = ((float)i * 2 * IM_PI) / (float)IM_ARRAYSIZE(CircleVtx12);
-        CircleVtx12[i] = ImVec2(cosf(a), sinf(a));
+        CircleVtx12[i] = ImVec2(ImCos(a), ImSin(a));
     }
 }
 
@@ -907,7 +909,7 @@ void ImDrawList::PathArcTo(const ImVec2& centre, float radius, float a_min, floa
     for (int i = 0; i <= num_segments; i++)
     {
         const float a = a_min + ((float)i / (float)num_segments) * (a_max - a_min);
-        _Path.push_back(ImVec2(centre.x + cosf(a) * radius, centre.y + sinf(a) * radius));
+        _Path.push_back(ImVec2(centre.x + ImCos(a) * radius, centre.y + ImSin(a) * radius));
     }
 }
 
@@ -2706,7 +2708,7 @@ static inline float ImAcos01(float x)
 {
     if (x <= 0.0f) return IM_PI * 0.5f;
     if (x >= 1.0f) return 0.0f;
-    return acosf(x);
+    return ImAcos(x);
     //return (-0.69813170079773212f * x * x - 0.87266462599716477f) * x + 1.5707963267948966f; // Cheap approximation, may be enough for what we do.
 }
 

imgui_internal.h

@@ -154,6 +154,13 @@ static inline float  ImPow(float x, float y)
 static inline double ImPow(double x, double y)                                  { return pow(x, y); }
 static inline float  ImFmod(float x, float y)                                   { return fmodf(x, y); }
 static inline double ImFmod(double x, double y)                                 { return fmod(x, y); }
+static inline float  ImCos(float x)                                             { return cosf(x); }
+static inline float  ImSin(float x)                                             { return sinf(x); }
+static inline float  ImAcos(float x)                                            { return acosf(x); }
+static inline float  ImAtan2(float y, float x)                                  { return atan2f(y, x); }
+static inline double ImAtof(const char* s)                                      { return atof(s); }
+static inline float  ImFloorStd(float x)                                        { return floorf(x); }   // we already uses our own ImFloor() { return (float)(int)v } internally so the standard one wrapper is named differently (it's used by stb_truetype)
+static inline float  ImCeil(float x)                                            { return ceilf(x); }
 #endif
 // - ImMin/ImMax/ImClamp/ImLerp/ImSwap are used by widgets which support for variety of types: signed/unsigned int/long long float/double, using templates here but we could also redefine them 6 times
 template<typename T> static inline T ImMin(T lhs, T rhs)                        { return lhs < rhs ? lhs : rhs; }