// ---------------------------------------------------- texture_font_delete ---
void
texture_font_delete( texture_font_t *self )
{
size_t i;
texture_glyph_t *glyph;
assert( self );
if(self->location == TEXTURE_FONT_FILE && self->filename)
free( self->filename );
for( i=0; i<vector_size( self->glyphs ); ++i)
{
glyph = *(texture_glyph_t **) vector_get( self->glyphs, i );
texture_glyph_delete( glyph);
}
vector_delete( self->glyphs );
free( self );
}
// ---------------------------------------------------- texture_font_delete ---
void
texture_font_delete( texture_font_t *self )
{
assert( self );
if( self->filename )
{
free( self->filename );
}
size_t i;
texture_glyph_t *glyph;
for( i=0; i<vector_size( self->glyphs ); ++i)
{
glyph = *(texture_glyph_t **) vector_get( self->glyphs, i );
texture_glyph_delete( glyph);
}
vector_delete( self->glyphs );
free( self );
}
/* ------------------------------------------------------------------------- */
size_t
texture_font_cache_glyphs( TextureFont *self,
wchar_t * charcodes )
{
size_t i, x, y, width, height, depth, w, h;
FT_Library library;
FT_Error error;
FT_Face face;
FT_GlyphSlot slot;
FT_UInt glyph_index;
TextureGlyph *glyph;
Region region;
unsigned char c;
size_t missed = 0;
width = self->atlas->width;
height = self->atlas->height;
depth = self->atlas->depth;
if( !texture_font_load_face( &library, self->filename, self->size, &face ) )
{
return wcslen(charcodes);
}
/* Load each glyph */
for( i=0; i<wcslen(charcodes); ++i )
{
glyph_index = FT_Get_Char_Index( face, charcodes[i] );
// WARNING: We use texture-atlas depth to guess if user wants
// LCD subpixel rendering
FT_Int32 flags = FT_LOAD_RENDER;
if( !self->hinting )
{
flags |= FT_LOAD_NO_HINTING | FT_LOAD_NO_AUTOHINT;
}
else
{
flags |= FT_LOAD_FORCE_AUTOHINT;
}
if( depth == 3 )
{
FT_Library_SetLcdFilter( library, FT_LCD_FILTER_LIGHT );
flags |= FT_LOAD_TARGET_LCD;
if( self->lcd_filter )
{
FT_Library_SetLcdFilterWeights( library, self->lcd_weights );
}
}
error = FT_Load_Glyph( face, glyph_index, flags );
if( error )
{
fprintf(stderr, "FT_Error (line %d, code 0x%02x) : %s\n",
__LINE__, FT_Errors[error].code, FT_Errors[error].message);
FT_Done_FreeType( library );
return wcslen(charcodes)-i;
}
slot = face->glyph;
/* Gamma correction (sort of) */
for( x=0; x<slot->bitmap.width; ++x )
{
for( y=0; y<slot->bitmap.rows; ++y )
{
c = *(unsigned char *)(slot->bitmap.buffer
+ y*slot->bitmap.pitch + x );
c = (unsigned char) ( pow(c/255.0, self->gamma) * 255);
*(unsigned char *)(slot->bitmap.buffer
+ y*slot->bitmap.pitch + x ) = c;
}
}
// We want each glyph to be separated by at least one black pixel
// (for example for shader used in demo-subpixel.c)
w = slot->bitmap.width/depth + 1;
h = slot->bitmap.rows + 1;
region = texture_atlas_get_region( self->atlas, w, h );
if ( region.x < 0 )
{
missed++;
continue;
}
w = w - 1;
h = h - 1;
x = region.x;
y = region.y;
texture_atlas_set_region( self->atlas, x, y, w, h,
slot->bitmap.buffer, slot->bitmap.pitch );
glyph = texture_glyph_new( );
glyph->font = self;
glyph->charcode = charcodes[i];
glyph->kerning = 0;
glyph->width = w;
glyph->height = h;
glyph->offset_x = slot->bitmap_left;
glyph->offset_y = slot->bitmap_top;
glyph->u0 = x/(float)width;
glyph->v0 = y/(float)height;
glyph->u1 = (x + glyph->width)/(float)width;
glyph->v1 = (y + glyph->height)/(float)height;
/* Discard hinting to get advance */
FT_Load_Glyph( face, glyph_index, FT_LOAD_RENDER | FT_LOAD_NO_HINTING);
slot = face->glyph;
glyph->advance_x = slot->advance.x/64.0;
glyph->advance_y = slot->advance.y/64.0;
vector_push_back( self->glyphs, glyph );
texture_glyph_delete( glyph );
}
FT_Done_Face( face );
FT_Done_FreeType( library );
texture_atlas_upload( self->atlas );
texture_font_generate_kerning( self );
return missed;
}
// ------------------------------------------------- texture_font_get_glyph ---
texture_glyph_t *
texture_font_get_glyph( texture_font_t * self,
wchar_t charcode )
{
assert( self );
size_t i;
wchar_t buffer[2] = {0,0};
texture_glyph_t *glyph;
assert( self );
assert( self->filename );
assert( self->atlas );
/* Check if charcode has been already loaded */
for( i=0; i<self->glyphs->size; ++i )
{
glyph = *(texture_glyph_t **) vector_get( self->glyphs, i );
// If charcode is -1, we don't care about outline type or thickness
if( (glyph->charcode == charcode) &&
((charcode == (wchar_t)(-1) ) ||
((glyph->outline_type == self->outline_type) &&
(glyph->outline_thickness == self->outline_thickness)) ))
{
return glyph;
}
}
/* charcode -1 is special : it is used for line drawing (overline,
* underline, strikethrough) and background.
*/
if( charcode == (wchar_t)(-1) )
{
size_t width = self->atlas->width;
size_t height = self->atlas->height;
ivec4 region = texture_atlas_get_region( self->atlas, 5, 5 );
texture_glyph_t * glyph = texture_glyph_new( );
static unsigned char data[4*4*3] = {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
if ( region.x < 0 )
{
fprintf( stderr, "Texture atlas is full (line %d)\n", __LINE__ );
texture_glyph_delete(glyph);
return NULL;
}
texture_atlas_set_region( self->atlas, region.x, region.y, 4, 4, data, 0 );
glyph->charcode = (wchar_t)(-1);
glyph->s0 = (region.x+2)/(float)width;
glyph->t0 = (region.y+2)/(float)height;
glyph->s1 = (region.x+3)/(float)width;
glyph->t1 = (region.y+3)/(float)height;
vector_push_back( self->glyphs, &glyph );
return glyph; //*(texture_glyph_t **) vector_back( self->glyphs );
}
/* Glyph has not been already loaded */
buffer[0] = charcode;
if( texture_font_load_glyphs( self, buffer ) == 0 )
{
return *(texture_glyph_t **) vector_back( self->glyphs );
}
return NULL;
}