bgfx/examples/common/font/font_manager.cpp

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/* Copyright 2013 Jeremie Roy. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#include "font_manager.h"
#include "../cube_atlas.h"
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#if BX_COMPILER_MSVC
# pragma warning(push)
# pragma warning(disable: 4100) // DISABLE warning C4100: '' : unreferenced formal parameter
# pragma warning(disable: 4146) // DISABLE warning C4146: unary minus operator applied to unsigned type, result still unsigned
# pragma warning(disable: 4700) // DISABLE warning C4700: uninitialized local variable 'temp' used
# pragma warning(disable: 4701) // DISABLE warning C4701: potentially uninitialized local variable '' used
# include "../../../3rdparty/freetype/freetype.h"
# pragma warning(pop)
#else
# include "../../../3rdparty/freetype/freetype.h"
#endif // BX_COMPILER_MSVC
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#include "../../../3rdparty/edtaa3/edtaa3func.h"
#include "../../../3rdparty/edtaa3/edtaa3func.cpp"
#include <math.h>
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#include <bx/bx.h>
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#if BGFX_CONFIG_USE_TINYSTL
namespace tinystl
{
//struct bgfx_allocator
//{
//static void* static_allocate(size_t _bytes);
//static void static_deallocate(void* _ptr, size_t /*_bytes*/);
//};
} // namespace tinystl
//# define TINYSTL_ALLOCATOR tinystl::bgfx_allocator
# include <TINYSTL/unordered_map.h>
//# include <TINYSTL/unordered_set.h>
namespace stl = tinystl;
#else
# include <unordered_map>
namespace std { namespace tr1 {} }
namespace stl {
using namespace std;
using namespace std::tr1;
}
#endif // BGFX_CONFIG_USE_TINYSTL
class FontManager::TrueTypeFont
{
public:
TrueTypeFont();
~TrueTypeFont();
/// Initialize from an external buffer
/// @remark The ownership of the buffer is external, and you must ensure it stays valid up to this object lifetime
/// @return true if the initialization succeed
bool init(const uint8_t* _buffer, uint32_t _bufferSize, int32_t _fontIndex, uint32_t _pixelHeight );
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/// return the font descriptor of the current font
FontInfo getFontInfo();
/// raster a glyph as 8bit alpha to a memory buffer
/// update the GlyphInfo according to the raster strategy
/// @ remark buffer min size: glyphInfo.m_width * glyphInfo * height * sizeof(char)
bool bakeGlyphAlpha(CodePoint_t _codePoint, GlyphInfo& _outGlyphInfo, uint8_t* _outBuffer);
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/// raster a glyph as 32bit subpixel rgba to a memory buffer
/// update the GlyphInfo according to the raster strategy
/// @ remark buffer min size: glyphInfo.m_width * glyphInfo * height * sizeof(uint32_t)
bool bakeGlyphSubpixel(CodePoint_t _codePoint, GlyphInfo& _outGlyphInfo, uint8_t* _outBuffer);
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/// raster a glyph as 8bit signed distance to a memory buffer
/// update the GlyphInfo according to the raster strategy
/// @ remark buffer min size: glyphInfo.m_width * glyphInfo * height * sizeof(char)
bool bakeGlyphDistance(CodePoint_t _codePoint, GlyphInfo& _outGlyphInfo, uint8_t* _outBuffer);
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private:
void* m_font;
};
struct FTHolder
{
FT_Library m_library;
FT_Face m_face;
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};
FontManager::TrueTypeFont::TrueTypeFont(): m_font(NULL)
{
}
FontManager::TrueTypeFont::~TrueTypeFont()
{
if(m_font!=NULL)
{
FTHolder* holder = (FTHolder*) m_font;
FT_Done_Face( holder->m_face );
FT_Done_FreeType( holder->m_library );
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delete m_font;
m_font = NULL;
}
}
bool FontManager::TrueTypeFont::init(const uint8_t* _buffer, uint32_t _bufferSize, int32_t _fontIndex, uint32_t _pixelHeight)
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{
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BX_CHECK((_bufferSize > 256 && _bufferSize < 100000000), "TrueType buffer size is suspicious");
BX_CHECK((_pixelHeight > 4 && _pixelHeight < 128), "TrueType buffer size is suspicious");
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BX_CHECK(m_font == NULL, "TrueTypeFont already initialized" );
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FTHolder* holder = new FTHolder();
// Initialize Freetype library
FT_Error error = FT_Init_FreeType( &holder->m_library );
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if( error)
{
delete holder;
return false;
}
error = FT_New_Memory_Face( holder->m_library, _buffer, _bufferSize, _fontIndex, &holder->m_face );
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if ( error == FT_Err_Unknown_File_Format )
{
// the font file could be opened and read, but it appears
//that its font format is unsupported
FT_Done_FreeType( holder->m_library );
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delete holder;
return false;
}
else if ( error )
{
// another error code means that the font file could not
// be opened or read, or simply that it is broken...
FT_Done_FreeType( holder->m_library );
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delete holder;
return false;
}
// Select unicode charmap
error = FT_Select_Charmap( holder->m_face, FT_ENCODING_UNICODE );
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if( error )
{
FT_Done_Face( holder->m_face );
FT_Done_FreeType( holder->m_library );
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return false;
}
//set size in pixels
error = FT_Set_Pixel_Sizes( holder->m_face, 0, _pixelHeight );
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if( error )
{
FT_Done_Face( holder->m_face );
FT_Done_FreeType( holder->m_library );
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return false;
}
m_font = holder;
return true;
}
FontInfo FontManager::TrueTypeFont::getFontInfo()
{
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BX_CHECK(m_font != NULL, "TrueTypeFont not initialized" );
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FTHolder* holder = (FTHolder*) m_font;
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//todo manage unscalable font
BX_CHECK(FT_IS_SCALABLE (holder->m_face), "Font is unscalable");
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FT_Size_Metrics metrics = holder->m_face->size->metrics;
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FontInfo outFontInfo;
outFontInfo.m_scale = 1.0f;
outFontInfo.m_ascender = metrics.ascender /64.0f;
outFontInfo.m_descender = metrics.descender /64.0f;
outFontInfo.m_lineGap = (metrics.height - metrics.ascender + metrics.descender) /64.0f;
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outFontInfo.m_underline_position = FT_MulFix(holder->m_face->underline_position, metrics.y_scale) /64.0f;
outFontInfo.m_underline_thickness= FT_MulFix(holder->m_face->underline_thickness,metrics.y_scale) /64.0f;
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return outFontInfo;
}
bool FontManager::TrueTypeFont::bakeGlyphAlpha(CodePoint_t _codePoint, GlyphInfo& _glyphInfo, uint8_t* _outBuffer)
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{
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BX_CHECK(m_font != NULL, "TrueTypeFont not initialized" );
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FTHolder* holder = (FTHolder*) m_font;
_glyphInfo.m_glyphIndex = FT_Get_Char_Index( holder->m_face, _codePoint );
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FT_GlyphSlot slot = holder->m_face->glyph;
FT_Error error = FT_Load_Glyph( holder->m_face, _glyphInfo.m_glyphIndex, FT_LOAD_DEFAULT );
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if(error) { return false; }
FT_Glyph glyph;
error = FT_Get_Glyph( slot, &glyph );
if ( error ) { return false; }
error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_NORMAL, 0, 1 );
if(error){ return false; }
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyph;
int32_t x = bitmap->left;
int32_t y = -bitmap->top;
int32_t w = bitmap->bitmap.width;
int32_t h = bitmap->bitmap.rows;
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_glyphInfo.m_offset_x = (float) x;
_glyphInfo.m_offset_y = (float) y;
_glyphInfo.m_width = (float) w;
_glyphInfo.m_height = (float) h;
_glyphInfo.m_advance_x = (float)slot->advance.x /64.0f;
_glyphInfo.m_advance_y = (float)slot->advance.y /64.0f;
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int32_t charsize = 1;
int32_t depth=1;
int32_t stride = bitmap->bitmap.pitch;
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for( int32_t ii=0; ii<h; ++ii )
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{
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memcpy(_outBuffer+(ii*w) * charsize * depth,
bitmap->bitmap.buffer + (ii*stride) * charsize, w * charsize * depth );
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}
FT_Done_Glyph(glyph);
return true;
}
bool FontManager::TrueTypeFont::bakeGlyphSubpixel(CodePoint_t _codePoint, GlyphInfo& _glyphInfo, uint8_t* _outBuffer)
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{
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BX_CHECK(m_font != NULL, "TrueTypeFont not initialized" );
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FTHolder* holder = (FTHolder*) m_font;
_glyphInfo.m_glyphIndex = FT_Get_Char_Index( holder->m_face, _codePoint );
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FT_GlyphSlot slot = holder->m_face->glyph;
FT_Error error = FT_Load_Glyph( holder->m_face, _glyphInfo.m_glyphIndex, FT_LOAD_DEFAULT );
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if(error) { return false; }
FT_Glyph glyph;
error = FT_Get_Glyph( slot, &glyph );
if ( error ) { return false; }
error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_LCD, 0, 1 );
if(error){ return false; }
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyph;
int32_t x = bitmap->left;
int32_t y = -bitmap->top;
int32_t w = bitmap->bitmap.width;
int32_t h = bitmap->bitmap.rows;
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_glyphInfo.m_offset_x = (float) x;
_glyphInfo.m_offset_y = (float) y;
_glyphInfo.m_width = (float) w;
_glyphInfo.m_height = (float) h;
_glyphInfo.m_advance_x = (float)slot->advance.x /64.0f;
_glyphInfo.m_advance_y = (float)slot->advance.y /64.0f;
int32_t charsize = 1;
int32_t depth=3;
int32_t stride = bitmap->bitmap.pitch;
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for( int32_t ii=0; ii<h; ++ii )
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{
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memcpy(_outBuffer+(ii*w) * charsize * depth,
bitmap->bitmap.buffer + (ii*stride) * charsize, w * charsize * depth );
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}
FT_Done_Glyph(glyph);
return true;
}
//TODO optimize: remove dynamic allocation and convert double to float
void make_distance_map( unsigned char *img, unsigned char *outImg, unsigned int width, unsigned int height )
{
short * xdist = (short *) malloc( width * height * sizeof(short) );
short * ydist = (short *) malloc( width * height * sizeof(short) );
double * gx = (double *) calloc( width * height, sizeof(double) );
double * gy = (double *) calloc( width * height, sizeof(double) );
double * data = (double *) calloc( width * height, sizeof(double) );
double * outside = (double *) calloc( width * height, sizeof(double) );
double * inside = (double *) calloc( width * height, sizeof(double) );
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uint32_t ii;
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// Convert img into double (data)
double img_min = 255, img_max = -255;
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for( ii=0; ii<width*height; ++ii)
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{
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double v = img[ii];
data[ii] = v;
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if (v > img_max) img_max = v;
if (v < img_min) img_min = v;
}
// Rescale image levels between 0 and 1
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for( ii=0; ii<width*height; ++ii)
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{
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data[ii] = (img[ii]-img_min)/(img_max-img_min);
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}
// Compute outside = edtaa3(bitmap); % Transform background (0's)
computegradient( data, width, height, gx, gy);
edtaa3(data, gx, gy, width, height, xdist, ydist, outside);
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for( ii=0; ii<width*height; ++ii)
if( outside[ii] < 0 )
outside[ii] = 0.0;
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// Compute inside = edtaa3(1-bitmap); % Transform foreground (1's)
memset(gx, 0, sizeof(double)*width*height );
memset(gy, 0, sizeof(double)*width*height );
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for( ii=0; ii<width*height; ++ii)
data[ii] = 1.0 - data[ii];
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computegradient( data, width, height, gx, gy);
edtaa3(data, gx, gy, width, height, xdist, ydist, inside);
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for( ii=0; ii<width*height; ++ii)
if( inside[ii] < 0 )
inside[ii] = 0.0;
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// distmap = outside - inside; % Bipolar distance field
unsigned char *out = outImg;//(unsigned char *) malloc( width * height * sizeof(unsigned char) );
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for( ii=0; ii<width*height; ++ii)
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{
//out[i] = 127 - outside[i]*8;
//if(out[i]<0) out[i] = 0;
//out[i] += inside[i]*16;
//if(out[i]>255) out[i] = 255;
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outside[ii] -= inside[ii];
outside[ii] = 128 + outside[ii]*16;
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//if(outside[i] > 8) outside[i] = 8;
//if(inside[i] > 8) outside[i] = 8;
//outside[i] = 128 - inside[i]*8 + outside[i]*8;
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if( outside[ii] < 0 ) outside[ii] = 0;
if( outside[ii] > 255 ) outside[ii] = 255;
out[ii] = 255 - (unsigned char) outside[ii];
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//out[i] = (unsigned char) outside[i];
}
free( xdist );
free( ydist );
free( gx );
free( gy );
free( data );
free( outside );
free( inside );
}
bool FontManager::TrueTypeFont::bakeGlyphDistance(CodePoint_t _codePoint, GlyphInfo& _glyphInfo, uint8_t* _outBuffer)
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{
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BX_CHECK(m_font != NULL, "TrueTypeFont not initialized" );
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FTHolder* holder = (FTHolder*) m_font;
_glyphInfo.m_glyphIndex = FT_Get_Char_Index( holder->m_face, _codePoint );
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FT_Int32 loadMode = FT_LOAD_DEFAULT|FT_LOAD_NO_HINTING;
FT_Render_Mode renderMode = FT_RENDER_MODE_NORMAL;
FT_GlyphSlot slot = holder->m_face->glyph;
FT_Error error = FT_Load_Glyph( holder->m_face, _glyphInfo.m_glyphIndex, loadMode );
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if(error) { return false; }
FT_Glyph glyph;
error = FT_Get_Glyph( slot, &glyph );
if ( error ) { return false; }
error = FT_Glyph_To_Bitmap( &glyph, renderMode, 0, 1 );
if(error){ return false; }
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyph;
int32_t x = bitmap->left;
int32_t y = -bitmap->top;
int32_t w = bitmap->bitmap.width;
int32_t h = bitmap->bitmap.rows;
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_glyphInfo.m_offset_x = (float) x;
_glyphInfo.m_offset_y = (float) y;
_glyphInfo.m_width = (float) w;
_glyphInfo.m_height = (float) h;
_glyphInfo.m_advance_x = (float)slot->advance.x /64.0f;
_glyphInfo.m_advance_y = (float)slot->advance.y /64.0f;
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int32_t charsize = 1;
int32_t depth=1;
int32_t stride = bitmap->bitmap.pitch;
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for(int32_t ii=0; ii<h; ++ii )
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{
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memcpy(_outBuffer+(ii*w) * charsize * depth,
bitmap->bitmap.buffer + (ii*stride) * charsize, w * charsize * depth );
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}
FT_Done_Glyph(glyph);
if(w*h >0)
{
uint32_t dw = 6;
uint32_t dh = 6;
if(dw<2) dw = 2;
if(dh<2) dh = 2;
uint32_t nw = w + dw*2;
uint32_t nh = h + dh*2;
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BX_CHECK(nw*nh < 128*128, "buffer overflow");
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uint32_t buffSize = nw*nh*sizeof(uint8_t);
uint8_t * alphaImg = (uint8_t *) malloc( buffSize );
memset(alphaImg, 0, nw*nh*sizeof(uint8_t));
//copy the original buffer to the temp one
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for(uint32_t ii= dh; ii< nh-dh; ++ii)
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{
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memcpy(alphaImg+ii*nw+dw, _outBuffer+(ii-dh)*w, w);
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}
make_distance_map(alphaImg, _outBuffer, nw, nh);
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free(alphaImg);
_glyphInfo.m_offset_x -= (float) dw;
_glyphInfo.m_offset_y -= (float) dh;
_glyphInfo.m_width = (float) nw ;
_glyphInfo.m_height = (float) nh;
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}
return true;
}
//*************************************************************
typedef stl::unordered_map<CodePoint_t, GlyphInfo> GlyphHash_t;
// cache font data
struct FontManager::CachedFont
{
CachedFont(){ m_trueTypeFont = NULL; m_masterFontHandle.idx = -1; }
FontInfo m_fontInfo;
GlyphHash_t m_cachedGlyphs;
FontManager::TrueTypeFont* m_trueTypeFont;
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// an handle to a master font in case of sub distance field font
FontHandle m_masterFontHandle;
int16_t m_padding;
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};
const uint16_t MAX_OPENED_FILES = 64;
const uint16_t MAX_OPENED_FONT = 64;
const uint32_t MAX_FONT_BUFFER_SIZE = 512*512*4;
FontManager::FontManager(Atlas* _atlas):m_filesHandles(MAX_OPENED_FILES), m_fontHandles(MAX_OPENED_FONT)
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{
m_atlas = _atlas;
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m_ownAtlas = false;
init();
}
FontManager::FontManager(uint32_t _textureSideWidth):m_filesHandles(MAX_OPENED_FILES), m_fontHandles(MAX_OPENED_FONT)
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{
m_atlas = new Atlas(_textureSideWidth);
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m_ownAtlas = true;
init();
}
void FontManager::init()
{
m_cachedFiles = new CachedFile[MAX_OPENED_FILES];
m_cachedFonts = new CachedFont[MAX_OPENED_FONT];
m_buffer = new uint8_t[MAX_FONT_BUFFER_SIZE];
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const uint32_t W = 3;
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// Create filler rectangle
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uint8_t buffer[W*W*4];
memset( buffer, 255, W * W * 4);
m_blackGlyph.m_width = W;
m_blackGlyph.m_height = W;
///make sure the black glyph doesn't bleed by using a one pixel inner outline
m_blackGlyph.m_regionIndex = m_atlas->addRegion(W, W, buffer, AtlasRegion::TYPE_GRAY, 1 );
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}
FontManager::~FontManager()
{
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BX_CHECK(m_fontHandles.getNumHandles() == 0, "All the fonts must be destroyed before destroying the manager");
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delete [] m_cachedFonts;
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BX_CHECK(m_filesHandles.getNumHandles() == 0, "All the font files must be destroyed before destroying the manager");
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delete [] m_cachedFiles;
delete [] m_buffer;
if(m_ownAtlas)
{
delete m_atlas;
}
}
TrueTypeHandle FontManager::loadTrueTypeFromFile(const char* _fontPath)
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{
FILE * pFile;
pFile = fopen (_fontPath, "rb");
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if (pFile==NULL)
{
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
// Go to the end of the file.
if (fseek(pFile, 0L, SEEK_END) == 0)
{
// Get the size of the file.
long bufsize = ftell(pFile);
if (bufsize == -1)
{
fclose(pFile);
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
uint8_t* buffer = new uint8_t[bufsize];
// Go back to the start of the file.
fseek(pFile, 0L, SEEK_SET);
// Read the entire file into memory.
uint32_t newLen = fread((void*)buffer, sizeof(char), bufsize, pFile);
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if (newLen == 0)
{
fclose(pFile);
delete [] buffer;
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
fclose(pFile);
uint16_t id = m_filesHandles.alloc();
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BX_CHECK(id != bx::HandleAlloc::invalid, "No more room for files");
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m_cachedFiles[id].buffer = buffer;
m_cachedFiles[id].bufferSize = bufsize;
TrueTypeHandle ret = {id};
return ret;
}
//TODO validate font
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
TrueTypeHandle FontManager::loadTrueTypeFromMemory(const uint8_t* _buffer, uint32_t _size)
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{
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uint16_t id = m_filesHandles.alloc();
BX_CHECK(id != bx::HandleAlloc::invalid, "Invalid handle used");
m_cachedFiles[id].buffer = new uint8_t[_size];
m_cachedFiles[id].bufferSize = _size;
memcpy(m_cachedFiles[id].buffer, _buffer, _size);
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//TODO validate font
TrueTypeHandle ret = {id};
return ret;
}
void FontManager::unloadTrueType(TrueTypeHandle _handle)
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{
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BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
delete m_cachedFiles[_handle.idx].buffer;
m_cachedFiles[_handle.idx].bufferSize = 0;
m_cachedFiles[_handle.idx].buffer = NULL;
m_filesHandles.free(_handle.idx);
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}
FontHandle FontManager::createFontByPixelSize(TrueTypeHandle _tt_handle, uint32_t _typefaceIndex, uint32_t _pixelSize, FontType _fontType)
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{
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BX_CHECK(bgfx::invalidHandle != _tt_handle.idx, "Invalid handle used");
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TrueTypeFont* ttf = new TrueTypeFont();
if(!ttf->init( m_cachedFiles[_tt_handle.idx].buffer, m_cachedFiles[_tt_handle.idx].bufferSize, _typefaceIndex, _pixelSize))
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{
delete ttf;
FontHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
uint16_t fontIdx = m_fontHandles.alloc();
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BX_CHECK(fontIdx != bx::HandleAlloc::invalid, "Invalid handle used");
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m_cachedFonts[fontIdx].m_trueTypeFont = ttf;
m_cachedFonts[fontIdx].m_fontInfo = ttf->getFontInfo();
m_cachedFonts[fontIdx].m_fontInfo.m_fontType = _fontType;
m_cachedFonts[fontIdx].m_fontInfo.m_pixelSize = _pixelSize;
m_cachedFonts[fontIdx].m_cachedGlyphs.clear();
m_cachedFonts[fontIdx].m_masterFontHandle.idx = -1;
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FontHandle ret = {fontIdx};
return ret;
}
FontHandle FontManager::createScaledFontToPixelSize(FontHandle _baseFontHandle, uint32_t _pixelSize)
{
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BX_CHECK(bgfx::invalidHandle != _baseFontHandle.idx, "Invalid handle used");
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CachedFont& font = m_cachedFonts[_baseFontHandle.idx];
FontInfo& fontInfo = font.m_fontInfo;
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FontInfo newFontInfo = fontInfo;
newFontInfo.m_pixelSize = _pixelSize;
newFontInfo.m_scale = (float)_pixelSize / (float) fontInfo.m_pixelSize;
newFontInfo.m_ascender = (newFontInfo.m_ascender * newFontInfo.m_scale);
newFontInfo.m_descender = (newFontInfo.m_descender * newFontInfo.m_scale);
newFontInfo.m_lineGap = (newFontInfo.m_lineGap * newFontInfo.m_scale);
newFontInfo.m_underline_thickness = (newFontInfo.m_underline_thickness * newFontInfo.m_scale);
newFontInfo.m_underline_position = (newFontInfo.m_underline_position * newFontInfo.m_scale);
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uint16_t fontIdx = m_fontHandles.alloc();
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BX_CHECK(fontIdx != bx::HandleAlloc::invalid, "Invalid handle used");
m_cachedFonts[fontIdx].m_cachedGlyphs.clear();
m_cachedFonts[fontIdx].m_fontInfo = newFontInfo;
m_cachedFonts[fontIdx].m_trueTypeFont = NULL;
m_cachedFonts[fontIdx].m_masterFontHandle = _baseFontHandle;
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FontHandle ret = {fontIdx};
return ret;
}
FontHandle FontManager::loadBakedFontFromFile(const char* /*fontPath*/, const char* /*descriptorPath*/)
{
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//assert(false); //TODO implement
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FontHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
FontHandle FontManager::loadBakedFontFromMemory(const uint8_t* /*imageBuffer*/, uint32_t /*imageSize*/, const uint8_t* /*descriptorBuffer*/, uint32_t /*descriptorSize*/)
{
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//assert(false); //TODO implement
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FontHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
void FontManager::destroyFont(FontHandle _handle)
{
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BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
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if(m_cachedFonts[_handle.idx].m_trueTypeFont != NULL)
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{
delete m_cachedFonts[_handle.idx].m_trueTypeFont;
m_cachedFonts[_handle.idx].m_trueTypeFont = NULL;
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}
m_cachedFonts[_handle.idx].m_cachedGlyphs.clear();
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m_fontHandles.free(_handle.idx);
}
bool FontManager::preloadGlyph(FontHandle _handle, const wchar_t* _string)
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{
BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
CachedFont& font = m_cachedFonts[_handle.idx];
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//if truetype present
if(font.m_trueTypeFont != NULL)
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{
//parse string
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for( uint32_t ii=0, end = wcslen(_string) ; ii < end; ++ii )
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{
//if glyph cached, continue
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CodePoint_t codePoint = _string[ii];
if(!preloadGlyph(_handle, codePoint))
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{
return false;
}
}
return true;
}
return false;
}
bool FontManager::preloadGlyph(FontHandle _handle, CodePoint_t _codePoint)
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{
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BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
CachedFont& font = m_cachedFonts[_handle.idx];
FontInfo& fontInfo = font.m_fontInfo;
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//check if glyph not already present
GlyphHash_t::iterator iter = font.m_cachedGlyphs.find(_codePoint);
if(iter != font.m_cachedGlyphs.end())
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{
return true;
}
//if truetype present
if(font.m_trueTypeFont != NULL)
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{
GlyphInfo glyphInfo;
//bake glyph as bitmap to buffer
switch(font.m_fontInfo.m_fontType)
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{
case FONT_TYPE_ALPHA:
font.m_trueTypeFont->bakeGlyphAlpha(_codePoint, glyphInfo, m_buffer);
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break;
//case FONT_TYPE_LCD:
//font.m_trueTypeFont->bakeGlyphSubpixel(codePoint, glyphInfo, m_buffer);
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//break;
case FONT_TYPE_DISTANCE:
font.m_trueTypeFont->bakeGlyphDistance(_codePoint, glyphInfo, m_buffer);
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break;
case FONT_TYPE_DISTANCE_SUBPIXEL:
font.m_trueTypeFont->bakeGlyphDistance(_codePoint, glyphInfo, m_buffer);
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break;
default:
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BX_CHECK(false, "TextureType not supported yet");
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};
//copy bitmap to texture
if(!addBitmap(glyphInfo, m_buffer) )
{
return false;
}
glyphInfo.m_advance_x = (glyphInfo.m_advance_x * fontInfo.m_scale);
glyphInfo.m_advance_y = (glyphInfo.m_advance_y * fontInfo.m_scale);
glyphInfo.m_offset_x = (glyphInfo.m_offset_x * fontInfo.m_scale);
glyphInfo.m_offset_y = (glyphInfo.m_offset_y * fontInfo.m_scale);
glyphInfo.m_height = (glyphInfo.m_height * fontInfo.m_scale);
glyphInfo.m_width = (glyphInfo.m_width * fontInfo.m_scale);
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// store cached glyph
font.m_cachedGlyphs[_codePoint] = glyphInfo;
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return true;
}else
{
//retrieve glyph from parent font if any
if(font.m_masterFontHandle.idx != bgfx::invalidHandle)
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{
if(preloadGlyph(font.m_masterFontHandle, _codePoint))
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{
GlyphInfo glyphInfo;
getGlyphInfo(font.m_masterFontHandle, _codePoint, glyphInfo);
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glyphInfo.m_advance_x = (glyphInfo.m_advance_x * fontInfo.m_scale);
glyphInfo.m_advance_y = (glyphInfo.m_advance_y * fontInfo.m_scale);
glyphInfo.m_offset_x = (glyphInfo.m_offset_x * fontInfo.m_scale);
glyphInfo.m_offset_y = (glyphInfo.m_offset_y * fontInfo.m_scale);
glyphInfo.m_height = (glyphInfo.m_height * fontInfo.m_scale);
glyphInfo.m_width = (glyphInfo.m_width * fontInfo.m_scale);
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// store cached glyph
font.m_cachedGlyphs[_codePoint] = glyphInfo;
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return true;
}
}
}
return false;
}
const FontInfo& FontManager::getFontInfo(FontHandle _handle)
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{
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BX_CHECK(bgfx::invalidHandle != _handle.idx, "Invalid handle used");
return m_cachedFonts[_handle.idx].m_fontInfo;
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}
bool FontManager::getGlyphInfo(FontHandle _handle, CodePoint_t _codePoint, GlyphInfo& _outInfo)
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{
GlyphHash_t::iterator iter = m_cachedFonts[_handle.idx].m_cachedGlyphs.find(_codePoint);
if(iter == m_cachedFonts[_handle.idx].m_cachedGlyphs.end())
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{
if(preloadGlyph(_handle, _codePoint))
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{
iter = m_cachedFonts[_handle.idx].m_cachedGlyphs.find(_codePoint);
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}else
{
return false;
}
}
_outInfo = iter->second;
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return true;
}
// ****************************************************************************
bool FontManager::addBitmap(GlyphInfo& _glyphInfo, const uint8_t* _data)
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{
_glyphInfo.m_regionIndex = m_atlas->addRegion((uint16_t) ceil(_glyphInfo.m_width),(uint16_t) ceil(_glyphInfo.m_height), _data, AtlasRegion::TYPE_GRAY);
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return true;
}