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