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Using custom ceilf inline impl in ImGui::CalcTextSize().

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Amend 7b0bf230, 4622fa4b6, 12b7977. (#791)
This commit is contained in:
ocornut
2026-05-29 15:59:44 +02:00
parent 12b7977555
commit 75f985998b
3 changed files with 5 additions and 5 deletions
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7
imgui.cpp
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@@ -6199,10 +6199,9 @@ ImVec2 ImGui::CalcTextSize(const char* text, const char* text_end, bool hide_tex
ImVec2 text_size = font->CalcTextSizeA(font_size, FLT_MAX, wrap_width, text, text_display_end, NULL);
// Round
// FIXME: This has been here since Dec 2015 (7b0bf230 then 4622fa4b6) but down the line we want this out. See #791.
// Investigate using ceilf or e.g. https://git.musl-libc.org/cgit/musl/tree/src/math/ceilf.c, https://embarkstudios.github.io/rust-gpu/api/src/libm/math/ceilf.rs.html
// The problem is that ceilf() has a measurable cost. Not high, but measurable!
text_size.x = IM_TRUNC(text_size.x + 0.999f);
// (see 7b0bf230, 4622fa4b6, #791 for details about this.)
// FIXME: Add a way to disable this.
text_size.x = ImCeilFast(text_size.x);
return text_size;
}

2
imgui.h
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@@ -30,7 +30,7 @@
// Library Version
// (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
#define IMGUI_VERSION "1.92.9 WIP"
#define IMGUI_VERSION_NUM 19281
#define IMGUI_VERSION_NUM 19282
#define IMGUI_HAS_TABLE // Added BeginTable() - from IMGUI_VERSION_NUM >= 18000
#define IMGUI_HAS_TEXTURES // Added ImGuiBackendFlags_RendererHasTextures - from IMGUI_VERSION_NUM >= 19198

1
imgui_internal.h
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@@ -531,6 +531,7 @@ inline float ImFloor(float f) { return
inline ImVec2 ImFloor(const ImVec2& v) { return ImVec2(ImFloor(v.x), ImFloor(v.y)); }
inline float ImTrunc64(float f) { return (float)(ImS64)(f); }
inline float ImRound64(float f) { return (float)(ImS64)(f + 0.5f); } // FIXME: Positive values only.
inline float ImCeilFast(float f) { int i = (int)f; return (float)(i + (f > (float)i)); } // Consider using the the bit-hack version (search for "0x1p120f").
inline int ImModPositive(int a, int b) { return (a + b) % b; }
inline float ImDot(const ImVec2& a, const ImVec2& b) { return a.x * b.x + a.y * b.y; }
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); }