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Internals: extracted ImFont::CalcTextSizeA() into ImFontCalcTextSizeEx() so we can make change to its signature.

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(for #3237, #952, #1062, #7363)
This commit is contained in:
ocornut
2025-08-27 21:43:07 +02:00
parent c63b5bd8fb
commit 34ab6c8a89
2 changed files with 17 additions and 13 deletions
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29
imgui_draw.cpp
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@@ -5459,13 +5459,13 @@ const char* ImFont::CalcWordWrapPosition(float size, const char* text, const cha
return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width); return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width);
} }
ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining) ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining)
{ {
if (!text_end) if (!text_end)
text_end = text_begin + ImStrlen(text_begin); // FIXME-OPT: Need to avoid this. text_end = text_begin + ImStrlen(text_begin); // FIXME-OPT: Need to avoid this.
const float line_height = size; const float line_height = size;
ImFontBaked* baked = GetFontBaked(size); ImFontBaked* baked = font->GetFontBaked(size);
const float scale = size / baked->Size; const float scale = size / baked->Size;
ImVec2 text_size = ImVec2(0, 0); ImVec2 text_size = ImVec2(0, 0);
@@ -5477,11 +5477,12 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
const char* s = text_begin; const char* s = text_begin;
while (s < text_end) while (s < text_end)
{ {
// Word-wrapping
if (word_wrap_enabled) if (word_wrap_enabled)
{ {
// Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature. // Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature.
if (!word_wrap_eol) if (!word_wrap_eol)
word_wrap_eol = ImFontCalcWordWrapPositionEx(this, size, s, text_end, wrap_width - line_width); word_wrap_eol = ImFontCalcWordWrapPositionEx(font, size, s, text_end, wrap_width - line_width);
if (s >= word_wrap_eol) if (s >= word_wrap_eol)
{ {
@@ -5503,18 +5504,15 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
else else
s += ImTextCharFromUtf8(&c, s, text_end); s += ImTextCharFromUtf8(&c, s, text_end);
if (c < 32) if (c == '\n')
{ {
if (c == '\n') text_size.x = ImMax(text_size.x, line_width);
{ text_size.y += line_height;
text_size.x = ImMax(text_size.x, line_width); line_width = 0.0f;
text_size.y += line_height; continue;
line_width = 0.0f;
continue;
}
if (c == '\r')
continue;
} }
if (c == '\r')
continue;
// Optimized inline version of 'float char_width = GetCharAdvance((ImWchar)c);' // Optimized inline version of 'float char_width = GetCharAdvance((ImWchar)c);'
float char_width = (c < (unsigned int)baked->IndexAdvanceX.Size) ? baked->IndexAdvanceX.Data[c] : -1.0f; float char_width = (c < (unsigned int)baked->IndexAdvanceX.Size) ? baked->IndexAdvanceX.Data[c] : -1.0f;
@@ -5543,6 +5541,11 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
return text_size; return text_size;
} }
ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining)
{
return ImFontCalcTextSizeEx(this, size, max_width, wrap_width, text_begin, text_end, out_remaining);
}
// Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound. // Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.
void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c, const ImVec4* cpu_fine_clip) void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c, const ImVec4* cpu_fine_clip)
{ {

1
imgui_internal.h
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@@ -430,6 +430,7 @@ IMGUI_API const char* ImTextFindPreviousUtf8Codepoint(const char* in_text_star
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. 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: High-level text functions (DO NOT USE!!! THIS IS A MINIMAL SUBSET OF LARGER UPCOMING CHANGES) // Helpers: High-level text functions (DO NOT USE!!! THIS IS A MINIMAL SUBSET OF LARGER UPCOMING CHANGES)
IMGUI_API ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining);
IMGUI_API const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width); IMGUI_API const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width);
IMGUI_API const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end); // trim trailing space and find beginning of next line IMGUI_API const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end); // trim trailing space and find beginning of next line