On 5/18/2012 1:21 AM, johnpf74 wrote:
Hello,
I am trying to get the advance amount for a stroked glyph. I cannot find it
anywhere in the documentation. I have a code snippet below. Basically when I
do the algorithm, the advance amount is not accounting for the width of the
outline, so the next character's outline overlaps the previous character.
Any suggestions?
Thanks,
John
// set the stroker with a 3 pixel stroke
FT_Stroker_Set(stroker,
static_cast< FT_Fixed>( 3 * 0x40),
FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND,
0);
FT_Glyph outlineGlyph = NULL;
// Load the glyph
FT_UInt glyphIndex = FT_Get_Char_Index( *face, chr );
FT_Load_Glyph( *face, glyphIndex, FT_LOAD_NO_BITMAP );
FT_Get_Glyph( (*face)->glyph,&outlineGlyph );
// stroke it
FT_Glyph_Stroke(&outlineGlyph, stroker, false );
// copy to bitmap
FT_Glyph_To_Bitmap(&outlineGlyph, FT_RENDER_MODE_NORMAL, NULL, true );
FT_BitmapGlyph outlineBitmap = (FT_BitmapGlyph)outlineGlyph;
// get metrics - chrDef is my own struct where I am storing per character
metrics
chrDef->m_bearingX = (*face)->glyph->metrics.horiBearingX>> 6;
chrDef->m_bearingY = (*face)->glyph->metrics.horiBearingY>> 6;
// ???? this advance does not account for extra width of outline in advance
chrDef->m_advance = (*face)->glyph->metrics.horiAdvance>> 6;
// I also tried this and got similar results
//chrDef->m_advance = outlineGlyph->advance.x>> 16;
FT_Glyph interiorGlyph = NULL;
FT_Load_Glyph( *face, glyphIndex, FT_LOAD_NO_BITMAP );
FT_Get_Glyph( (*face)->glyph,&interiorGlyph );
FT_Glyph_To_Bitmap(&interiorGlyph, FT_RENDER_MODE_NORMAL, NULL, true );
===
Although I'm not very familiar with freetype, I don't see any faults in
your code.
Best I can do is offer some of my code. Perhaps it will be of some help.
Typically I don't get to respond to this board cause someone else beats
me too it, so someone else respond who knows better too.
-------------------
CurrentGlyph->GlyphIndex =
FT_Get_Char_Index(FreeTypeFace, Letter);
FT_Load_Glyph(FreeTypeFace, CurrentGlyph->GlyphIndex,
FT_LOAD_DEFAULT);
GlyphPointer = &CurrentGlyph->Glyph;
FT_Get_Glyph(FreeTypeFace->glyph, GlyphPointer);
PenPointer = CurrentGlyph->Pen;
if(Kerning && Prev_Glyph && CurrentGlyph->GlyphIndex)
{
FT_Get_Kerning(
FreeTypeFace,
Prev_Glyph,
CurrentGlyph->GlyphIndex,
FT_KERNING_DEFAULT,
KernVectorPointer );
Pen_X += KernVector.x;
}
if(Prev_Glyph && CurrentGlyph->GlyphIndex)
{
if((Prev_RSB - FreeTypeFace->glyph->lsb_delta) >= 32)
Pen_X-=64;
else if ((Prev_RSB -
FreeTypeFace->glyph->lsb_delta) <= -32)
Pen_X+=64;
}
Prev_RSB = FreeTypeFace->glyph->rsb_delta;
CurrentGlyph->Pen->x = FT_PIX_CEIL(Pen_X);
CurrentGlyph->Pen->y = FT_PIX_CEIL(Pen_Y);
//if(Prev_Advance >=
(CurrentGlyph->Glyph->advance.x>>10 + Pen_X)) Pen_X = Prev_Advance
Pen_X += CurrentGlyph->Glyph->advance.x>>10;
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