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Handle UTF-8 decoding for rendering and text size calculation
This commit is contained in:
ocornut
parent
a1162ac001
commit
51bbe1d961
85
imgui.cpp
85
imgui.cpp
@ -390,6 +390,8 @@ static inline ImVec2 ImLerp(const ImVec2& a, const ImVec2& b, float t)
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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); }
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static inline float ImLength(const ImVec2& lhs) { return sqrt(lhs.x*lhs.x + lhs.y*lhs.y); }
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static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end); // return input UTF-8 bytes count
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static int ImStricmp(const char* str1, const char* str2)
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{
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int d;
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@ -4117,6 +4119,7 @@ bool InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlag
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else if (is_ctrl_down && IsKeyPressedMap(ImGuiKey_V))
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{
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if (g.IO.GetClipboardTextFn)
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{
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if (const char* clipboard = g.IO.GetClipboardTextFn())
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{
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// Remove new-line from pasted buffer
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@ -4134,6 +4137,7 @@ bool InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlag
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stb_textedit_paste(&edit_state, &edit_state.StbState, clipboard_filtered, clipboard_filtered_len);
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ImGui::MemFree(clipboard_filtered);
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}
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}
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}
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else if (g.IO.InputCharacters[0])
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{
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@ -5386,6 +5390,66 @@ const ImBitmapFont::FntGlyph* ImBitmapFont::FindGlyph(unsigned short c) const
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return NULL;
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}
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// Convert UTF-8 to 32-bits character, process single character input.
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// Based on stb_from_utf8() from github.com/nothings/stb/
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static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end)
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{
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if (*in_text != 0)
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{
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unsigned int c = -1;
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const char* str = in_text;
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if (!(*str & 0x80))
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{
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c = (unsigned int)(*str++);
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*out_char = c;
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return 1;
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}
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if ((*str & 0xe0) == 0xc0)
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{
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if (in_text_end && in_text_end - str < 2) return -1;
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if (*str < 0xc2) return -1;
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c = (*str++ & 0x1f) << 6;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f);
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*out_char = c;
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return 2;
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}
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if ((*str & 0xf0) == 0xe0)
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{
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if (in_text_end && in_text_end - str < 3) return -1;
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if (*str == 0xe0 && (str[1] < 0xa0 || str[1] > 0xbf)) return -1;
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if (*str == 0xed && str[1] > 0x9f) return -1; // str[1] < 0x80 is checked below
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c = (*str++ & 0x0f) << 12;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f) << 6;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f);
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*out_char = c;
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return 3;
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}
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if ((*str & 0xf8) == 0xf0)
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{
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if (in_text_end && in_text_end - str < 4) return -1;
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if (*str > 0xf4) return -1;
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if (*str == 0xf0 && (str[1] < 0x90 || str[1] > 0xbf)) return -1;
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if (*str == 0xf4 && str[1] > 0x8f) return -1; // str[1] < 0x80 is checked below
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c = (*str++ & 0x07) << 18;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f) << 12;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f) << 6;
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if ((*str & 0xc0) != 0x80) return -1;
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c += (*str++ & 0x3f);
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// utf-8 encodings of values used in surrogate pairs are invalid
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if ((c & 0xFFFFF800) == 0xD800) return -1;
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*out_char = c;
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return 4;
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}
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}
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*out_char = 0;
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return 0;
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}
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ImVec2 ImBitmapFont::CalcTextSize(float size, float max_width, const char* text_begin, const char* text_end, const char** remaining) const
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{
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if (max_width == 0.0f)
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@ -5402,7 +5466,12 @@ ImVec2 ImBitmapFont::CalcTextSize(float size, float max_width, const char* text_
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const char* s = text_begin;
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while (s < text_end)
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{
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const char c = *s;
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unsigned int c;
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const int bytes_count = ImTextCharFromUtf8(&c, s, text_end);
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s += bytes_count > 0 ? bytes_count : 1; // Handle decoding failure by skipping to next byte
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if (c > 0x10000)
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continue;
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if (c == '\n')
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{
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if (text_size.x < line_width)
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@ -5414,7 +5483,6 @@ ImVec2 ImBitmapFont::CalcTextSize(float size, float max_width, const char* text_
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{
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const float char_width = (glyph->XAdvance + Info->SpacingHoriz) * scale;
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//const float char_extend = (glyph->XOffset + glyph->Width * scale);
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if (line_width + char_width >= max_width)
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break;
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line_width += char_width;
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@ -5424,8 +5492,6 @@ ImVec2 ImBitmapFont::CalcTextSize(float size, float max_width, const char* text_
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if (const FntGlyph* glyph = FindGlyph((unsigned short)' '))
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line_width += (glyph->XAdvance + Info->SpacingHoriz) * 4 * scale;
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}
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s += 1;
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}
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if (line_width > 0 || text_size.y == 0.0f)
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@ -5460,10 +5526,15 @@ void ImBitmapFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& c
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float x = pos.x;
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float y = pos.y;
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for (const char* s = text_begin; s < text_end; s++)
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for (const char* s = text_begin; s < text_end; )
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{
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const char c = *s;
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if (c == '\n')
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unsigned int c;
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const int bytes_count = ImTextCharFromUtf8(&c, s, text_end);
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s += bytes_count > 0 ? bytes_count : 1; // Handle decoding failure by skipping to next byte
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if (c >= 0x10000)
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continue;
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if (c == '\n')
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{
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x = pos.x;
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y += line_height * scale;
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