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make sure pen position always refers to top left + remove measureText + append substring

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This commit is contained in:
Jeremie Roy
2013-05-22 17:15:58 +02:00
parent c13e53153f
commit 60e51ea707
2 changed files with 68 additions and 144 deletions
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196
examples/common/font/text_buffer_manager.cpp
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@@ -22,7 +22,7 @@
#include "fs_font_distance_field_subpixel.bin.h"
#define MAX_TEXT_BUFFER_COUNT 64
#define MAX_BUFFERED_CHARACTERS 8192
#define MAX_BUFFERED_CHARACTERS (8192 - 5)
class TextBuffer
{
@@ -64,15 +64,11 @@ public:
m_penX = _x; m_penY = _y;
}
/// return the size of the text
//Rectangle measureText(FontHandle _fontHandle, const char * _string);
//Rectangle measureText(FontHandle _fontHandle, const wchar_t * _string);
/// append an ASCII/utf-8 string to the buffer using current pen position and color
void appendText(FontHandle _fontHandle, const char* _string);
void appendText(FontHandle _fontHandle, const char* _string, const char* _end = NULL);
/// append a wide char unicode string to the buffer using current pen position and color
void appendText(FontHandle _fontHandle, const wchar_t* _string);
void appendText(FontHandle _fontHandle, const wchar_t* _string, const wchar_t* _end = NULL);
/// append a whole face of the atlas cube, mostly used for debugging and visualizing atlas
void appendAtlasFace(uint16_t _faceIndex);
@@ -215,7 +211,7 @@ TextBuffer::~TextBuffer()
delete[] m_indexBuffer;
}
void TextBuffer::appendText(FontHandle _fontHandle, const char* _string)
void TextBuffer::appendText(FontHandle _fontHandle, const char* _string, const char* _end)
{
GlyphInfo glyph;
const FontInfo& font = m_fontManager->getFontInfo(_fontHandle);
@@ -224,16 +220,17 @@ void TextBuffer::appendText(FontHandle _fontHandle, const char* _string)
{
m_originX = m_penX;
m_originY = m_penY;
m_lineDescender = 0; // font.m_descender;
m_lineAscender = 0; //font.m_ascender;
m_lineDescender = 0;
m_lineAscender = 0;
m_lineGap = 0;
}
CodePoint codepoint = 0;
uint32_t state = 0;
for (; *_string; ++_string)
for (; *_string && _string<_end ; ++_string)
{
if (!utf8_decode(&state, (uint32_t*)&codepoint, *_string) )
if (utf8_decode(&state, (uint32_t*)&codepoint, *_string) == UTF8_ACCEPT )
{
if (m_fontManager->getGlyphInfo(_fontHandle, codepoint, glyph) )
{
@@ -246,13 +243,10 @@ void TextBuffer::appendText(FontHandle _fontHandle, const char* _string)
}
}
if (state != UTF8_ACCEPT)
{
BX_CHECK(false, "The string is not well-formed");
}
BX_CHECK(state == UTF8_ACCEPT, "The string is not well-formed");
}
void TextBuffer::appendText(FontHandle _fontHandle, const wchar_t* _string)
void TextBuffer::appendText(FontHandle _fontHandle, const wchar_t* _string, const wchar_t* _end)
{
GlyphInfo glyph;
const FontInfo& font = m_fontManager->getFontInfo(_fontHandle);
@@ -261,14 +255,19 @@ void TextBuffer::appendText(FontHandle _fontHandle, const wchar_t* _string)
{
m_originX = m_penX;
m_originY = m_penY;
m_lineDescender = 0; // font.m_descender;
m_lineAscender = 0; //font.m_ascender;
m_lineDescender = 0;
m_lineAscender = 0;
m_lineGap = 0;
}
for (uint32_t ii = 0, end = wcslen(_string); ii < end; ++ii)
if( _end == NULL)
{
uint32_t _codePoint = _string[ii];
_end = _string + wcslen(_string);
}
BX_CHECK(_end >= _string);
for (const wchar_t* _current = _string; _current < _end; ++_current)
{
uint32_t _codePoint = *_current;
if (m_fontManager->getGlyphInfo(_fontHandle, _codePoint, glyph) )
{
appendGlyph(_codePoint, font, glyph);
@@ -282,6 +281,11 @@ void TextBuffer::appendText(FontHandle _fontHandle, const wchar_t* _string)
void TextBuffer::appendAtlasFace(uint16_t _faceIndex)
{
if( m_vertexCount/4 >= MAX_BUFFERED_CHARACTERS)
{
return;
}
float x0 = m_penX;
float y0 = m_penY;
float x1 = x0 + (float)m_fontManager->getAtlas()->getTextureSize();
@@ -306,29 +310,40 @@ void TextBuffer::appendAtlasFace(uint16_t _faceIndex)
void TextBuffer::clearTextBuffer()
{
m_penX = 0;
m_penY = 0;
m_originX = 0;
m_originY = 0;
m_vertexCount = 0;
m_indexCount = 0;
m_lineStartIndex = 0;
m_lineAscender = 0;
m_lineDescender = 0;
m_lineGap = 0;
m_rectangle.width = 0;
m_rectangle.height = 0;
}
void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const GlyphInfo& _glyphInfo)
{
if (_codePoint == L'\n')
{
if( m_vertexCount/4 >= MAX_BUFFERED_CHARACTERS)
{
m_penX = m_originX;
m_penY -= m_lineDescender;
m_penY += m_lineGap;
m_lineDescender = 0;
m_lineAscender = 0;
m_lineStartIndex = m_vertexCount;
return;
}
if (_codePoint == L'\n')
{
m_penX = m_originX;
m_penY += m_lineGap + m_lineAscender -m_lineDescender;
m_lineGap = _font.lineGap;
m_lineDescender = _font.descender;
m_lineAscender = _font.ascender;
m_lineStartIndex = m_vertexCount;
return;
}
//is there a change of font size that require the text on the left to be centered again ?
if (_font.ascender > m_lineAscender
|| (_font.descender < m_lineDescender) )
{
@@ -340,14 +355,12 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
float txtDecals = (_font.ascender - m_lineAscender);
m_lineAscender = _font.ascender;
m_lineGap = _font.lineGap;
m_penY += txtDecals;
verticalCenterLastLine( (txtDecals), (m_penY - m_lineAscender), (m_penY - m_lineDescender + m_lineGap) );
m_lineGap = _font.lineGap;
verticalCenterLastLine( (txtDecals), (m_penY - m_lineAscender), (m_penY + m_lineAscender - m_lineDescender + m_lineGap) );
}
float kerning = 0;
m_penX += kerning * _font.scale;
float kerning = 0 * _font.scale;
m_penX += kerning;
GlyphInfo& blackGlyph = m_fontManager->getBlackGlyph();
@@ -355,9 +368,9 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
&& m_backgroundColor & 0xFF000000)
{
float x0 = (m_penX - kerning);
float y0 = (m_penY - m_lineAscender);
float y0 = (m_penY);
float x1 = ( (float)x0 + (_glyphInfo.advance_x) );
float y1 = (m_penY - m_lineDescender + m_lineGap);
float y1 = (m_penY + m_lineAscender - m_lineDescender + m_lineGap);
m_fontManager->getAtlas()->packUV(blackGlyph.regionIndex, (uint8_t*)m_vertexBuffer, sizeof(TextVertex) * m_vertexCount + offsetof(TextVertex, u), sizeof(TextVertex) );
@@ -380,7 +393,7 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
&& m_underlineColor & 0xFF000000)
{
float x0 = (m_penX - kerning);
float y0 = (m_penY - m_lineDescender / 2);
float y0 = (m_penY + m_lineAscender - m_lineDescender * 0.5f);
float x1 = ( (float)x0 + (_glyphInfo.advance_x) );
float y1 = y0 + _font.underlineThickness;
@@ -405,7 +418,7 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
&& m_overlineColor & 0xFF000000)
{
float x0 = (m_penX - kerning);
float y0 = (m_penY - _font.ascender);
float y0 = (m_penY);
float x1 = ( (float)x0 + (_glyphInfo.advance_x) );
float y1 = y0 + _font.underlineThickness;
@@ -430,7 +443,7 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
&& m_strikeThroughColor & 0xFF000000)
{
float x0 = (m_penX - kerning);
float y0 = (m_penY - _font.ascender / 3);
float y0 = (m_penY + 0.666667f * _font.ascender);
float x1 = ( (float)x0 + (_glyphInfo.advance_x) );
float y1 = y0 + _font.underlineThickness;
@@ -451,9 +464,8 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
m_indexCount += 6;
}
float x0_precise = m_penX + (_glyphInfo.offset_x);
float x0 = (x0_precise);
float y0 = (m_penY + (_glyphInfo.offset_y) );
float x0 = m_penX + (_glyphInfo.offset_x);
float y0 = (m_penY + m_lineAscender + (_glyphInfo.offset_y) );
float x1 = (x0 + _glyphInfo.width);
float y1 = (y0 + _glyphInfo.height);
@@ -479,9 +491,9 @@ void TextBuffer::appendGlyph(CodePoint _codePoint, const FontInfo& _font, const
m_rectangle.width = m_penX;
}
if ( (m_penY - m_lineDescender) > m_rectangle.height)
if ( (m_penY +m_lineAscender - m_lineDescender+m_lineGap) > m_rectangle.height)
{
m_rectangle.height = (m_penY - m_lineDescender);
m_rectangle.height = (m_penY +m_lineAscender - m_lineDescender+m_lineGap);
}
}
@@ -813,18 +825,18 @@ void TextBufferManager::setPenPosition(TextBufferHandle _handle, float _x, float
bc.textBuffer->setPenPosition(_x, _y);
}
void TextBufferManager::appendText(TextBufferHandle _handle, FontHandle _fontHandle, const char* _string)
void TextBufferManager::appendText(TextBufferHandle _handle, FontHandle _fontHandle, const char* _string, const char* _end)
{
BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
BufferCache& bc = m_textBuffers[_handle.idx];
bc.textBuffer->appendText(_fontHandle, _string);
bc.textBuffer->appendText(_fontHandle, _string, _end);
}
void TextBufferManager::appendText(TextBufferHandle _handle, FontHandle _fontHandle, const wchar_t* _string)
void TextBufferManager::appendText(TextBufferHandle _handle, FontHandle _fontHandle, const wchar_t* _string, const wchar_t* _end)
{
BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
BufferCache& bc = m_textBuffers[_handle.idx];
bc.textBuffer->appendText(_fontHandle, _string);
bc.textBuffer->appendText(_fontHandle, _string, _end);
}
void TextBufferManager::appendAtlasFace(TextBufferHandle _handle, uint16_t _faceIndex)
@@ -841,88 +853,6 @@ void TextBufferManager::clearTextBuffer(TextBufferHandle _handle)
bc.textBuffer->clearTextBuffer();
}
TextRectangle TextBufferManager::measureText(FontHandle _fontHandle, const char* _string) const
{
GlyphInfo glyph;
const FontInfo& font = m_fontManager->getFontInfo(_fontHandle);
TextRectangle rect;
rect.width = 0;
rect.height = font.ascender - font.descender; //should I put lineGap here ?
CodePoint codepoint = 0;
uint32_t state = 0;
float w = 0;
for (; *_string; ++_string)
{
if (!utf8_decode(&state, (uint32_t*)&codepoint, *_string) )
{
if (m_fontManager->getGlyphInfo(_fontHandle, codepoint, glyph) )
{
if (codepoint == L'\n')
{
rect.height += font.lineGap + font.ascender - font.descender;
w=0;
break;
}
//TODO kerning
if((w + glyph.advance_x) > rect.width)
{
rect.width = w + glyph.advance_x;
}
}
else
{
BX_CHECK(false, "Glyph not found");
}
}
}
if (state != UTF8_ACCEPT)
{
BX_CHECK(false, "The string is not well-formed");
}
return rect;
}
TextRectangle TextBufferManager::measureText(FontHandle _fontHandle, const wchar_t* _string) const
{
GlyphInfo glyph;
const FontInfo& font = m_fontManager->getFontInfo(_fontHandle);
TextRectangle rect;
rect.width = 0;
rect.height = font.ascender - font.descender; //should I put lineGap here ?
float w = 0;
for (uint32_t ii = 0, end = wcslen(_string); ii < end; ++ii)
{
uint32_t codepoint = _string[ii];
if (m_fontManager->getGlyphInfo(_fontHandle, codepoint, glyph) )
{
if (codepoint == L'\n')
{
rect.height += font.lineGap + font.ascender - font.descender;
w=0;
break;
}
//TODO kerning
if((w + glyph.advance_x) > rect.width)
{
rect.width = w + glyph.advance_x;
}
}
else
{
BX_CHECK(false, "Glyph not found");
}
}
return rect;
}
TextRectangle TextBufferManager::getRectangle(TextBufferHandle _handle) const
{
BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");