144 lines
3.0 KiB
C++
144 lines
3.0 KiB
C++
/*
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* Copyright 2013 Jeremie Roy. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "text_metrics.h"
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#include "utf8.h"
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TextMetrics::TextMetrics(FontManager* _fontManager)
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: m_fontManager(_fontManager)
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{
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clearText();
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}
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void TextMetrics::clearText()
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{
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m_width = m_height = m_x = m_lineHeight = m_lineGap = 0;
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}
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void TextMetrics::appendText(FontHandle _fontHandle, const char* _string)
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{
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const FontInfo& font = m_fontManager->getFontInfo(_fontHandle);
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if (font.lineGap > m_lineGap)
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{
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m_lineGap = font.lineGap;
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}
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if ( (font.ascender - font.descender) > m_lineHeight)
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{
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m_height -= m_lineHeight;
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m_lineHeight = font.ascender - font.descender;
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m_height += m_lineHeight;
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}
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CodePoint codepoint = 0;
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uint32_t state = 0;
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for (; *_string; ++_string)
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{
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if (!utf8_decode(&state, (uint32_t*)&codepoint, *_string) )
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{
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const GlyphInfo* glyph = m_fontManager->getGlyphInfo(_fontHandle, codepoint);
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if (NULL != glyph)
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{
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if (codepoint == L'\n')
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{
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m_height += m_lineGap + font.ascender - font.descender;
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m_lineGap = font.lineGap;
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m_lineHeight = font.ascender - font.descender;
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m_x = 0;
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}
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m_x += glyph->advance_x;
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if(m_x > m_width)
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{
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m_width = m_x;
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}
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}
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else
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{
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BX_ASSERT(false, "Glyph not found");
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}
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}
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}
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BX_ASSERT(state == UTF8_ACCEPT, "The string is not well-formed");
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}
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TextLineMetrics::TextLineMetrics(const FontInfo& _fontInfo)
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{
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m_lineHeight = _fontInfo.ascender - _fontInfo.descender + _fontInfo.lineGap;
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}
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uint32_t TextLineMetrics::getLineCount(const bx::StringView& _str) const
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{
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CodePoint codepoint = 0;
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uint32_t state = 0;
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uint32_t lineCount = 1;
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for (const char* ptr = _str.getPtr(); ptr != _str.getTerm(); ++ptr)
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{
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if (utf8_decode(&state, (uint32_t*)&codepoint, *ptr) == UTF8_ACCEPT)
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{
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if (codepoint == L'\n')
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{
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++lineCount;
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}
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}
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}
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BX_ASSERT(state == UTF8_ACCEPT, "The string is not well-formed");
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return lineCount;
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}
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void TextLineMetrics::getSubText(const bx::StringView& _str, uint32_t _firstLine, uint32_t _lastLine, const char*& _begin, const char*& _end)
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{
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CodePoint codepoint = 0;
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uint32_t state = 0;
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// y is bottom of a text line
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uint32_t currentLine = 0;
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const char* ptr = _str.getPtr();
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while (ptr != _str.getTerm()
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&& (currentLine < _firstLine) )
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{
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for (; ptr != _str.getTerm(); ++ptr)
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{
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if (utf8_decode(&state, (uint32_t*)&codepoint, *ptr) == UTF8_ACCEPT)
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{
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if (codepoint == L'\n')
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{
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++currentLine;
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++ptr;
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break;
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}
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}
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}
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}
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BX_ASSERT(state == UTF8_ACCEPT, "The string is not well-formed");
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_begin = ptr;
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while (ptr != _str.getTerm()
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&& (currentLine < _lastLine) )
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{
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for (; ptr != _str.getTerm(); ++ptr)
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{
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if(utf8_decode(&state, (uint32_t*)&codepoint, *ptr) == UTF8_ACCEPT)
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{
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if(codepoint == L'\n')
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{
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++currentLine;
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++ptr;
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break;
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}
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}
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}
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}
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BX_ASSERT(state == UTF8_ACCEPT, "The string is not well-formed");
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_end = ptr;
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}
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