Added a 3D font loader that uses the Freetype2 library to
parse the vector data. Freetype2 supports many font formats including Type1, TrueType and OpenType fonts. Enable with the WITH_FREETYPE2 compile flag, in the source/blender/blenkernel and source/blender/blenlib dirs.
This commit is contained in:
@@ -145,8 +145,11 @@ static VFontData *vfont_get_data(VFont *vfont)
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}
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if (pf) {
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#ifdef WITH_FREETYPE2
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vfont->data= BLI_vfontdata_from_freetypefont(pf);
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#else
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vfont->data= BLI_vfontdata_from_psfont(pf);
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#endif
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if (pf != vfont->packedfile) {
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freePackedFile(pf);
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}
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@@ -183,7 +186,11 @@ VFont *load_vfont(char *name)
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waitcursor(1);
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#ifdef WITH_FREETYPE2
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vfd= BLI_vfontdata_from_freetypefont(pf);
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#else
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vfd= BLI_vfontdata_from_psfont(pf);
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#endif
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if (vfd) {
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vfont = alloc_libblock(&G.main->vfont, ID_VF, filename);
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@@ -63,5 +63,19 @@ typedef struct VFontData {
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BLI_vfontdata_from_psfont(
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struct PackedFile *pf);
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#ifdef WITH_FREETYPE2
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/**
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* Construct a new VFontData structure from
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* Freetype font data in a PackedFile.
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*
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* @param pf The font data.
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* @retval A new VFontData structure, or NULL
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* if unable to load.
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*/
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VFontData*
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BLI_vfontdata_from_freetypefont(
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struct PackedFile *pf);
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#endif
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#endif
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445
source/blender/blenlib/intern/freetypefont.c
Normal file
445
source/blender/blenlib/intern/freetypefont.c
Normal file
@@ -0,0 +1,445 @@
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/**
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* $Id$
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*
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* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version. The Blender
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* Foundation also sells licenses for use in proprietary software under
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* the Blender License. See http://www.blender.org/BL/ for information
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* about this.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is written by Rob Haarsma (phase)
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* All rights reserved.
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*
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL/BL DUAL LICENSE BLOCK *****
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*/
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#ifdef WITH_FREETYPE2
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#ifdef WIN32
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#pragma warning (disable:4244)
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#endif
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#include "MEM_guardedalloc.h"
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#include "BLI_vfontdata.h"
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#include "BLI_blenlib.h"
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#include "BLI_arithb.h"
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#include "BIF_toolbox.h"
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#include "DNA_packedFile_types.h"
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#include "DNA_curve_types.h"
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#define myMIN_ASCII 32
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#define myMAX_ASCII 126
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// should come from arithb.c
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#define MIN2(x,y) ( (x)<(y) ? (x) : (y) )
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#define MAX2(x,y) ( (x)>(y) ? (x) : (y) )
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/* local variables */
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static FT_Library library;
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static FT_Error err;
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#if 0
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// Freetype2 Outline struct
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typedef struct FT_Outline_
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{
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short n_contours; /* number of contours in glyph */
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short n_points; /* number of points in the glyph */
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FT_Vector* points; /* the outline's points */
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char* tags; /* the points flags */
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short* contours; /* the contour end points */
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int flags; /* outline masks */
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} FT_Outline;
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#endif
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/***//*
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from: http://www.freetype.org/freetype2/docs/glyphs/glyphs-6.html#section-1
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Vectorial representation of Freetype glyphs
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The source format of outlines is a collection of closed paths called "contours". Each contour is
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made of a series of line segments and bezier arcs. Depending on the file format, these can be
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second-order or third-order polynomials. The former are also called quadratic or conic arcs, and
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they come from the TrueType format. The latter are called cubic arcs and mostly come from the
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Type1 format.
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Each arc is described through a series of start, end and control points. Each point of the outline
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has a specific tag which indicates wether it is used to describe a line segment or an arc.
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The following rules are applied to decompose the contour's points into segments and arcs :
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# two successive "on" points indicate a line segment joining them.
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# one conic "off" point amidst two "on" points indicates a conic bezier arc, the "off" point being
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the control point, and the "on" ones the start and end points.
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# Two successive cubic "off" points amidst two "on" points indicate a cubic bezier arc. There must
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be exactly two cubic control points and two on points for each cubic arc (using a single cubic
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"off" point between two "on" points is forbidden, for example).
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# finally, two successive conic "off" points forces the rasterizer to create (during the scan-line
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conversion process exclusively) a virtual "on" point amidst them, at their exact middle. This
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greatly facilitates the definition of successive conic bezier arcs. Moreover, it's the way
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outlines are described in the TrueType specification.
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Note that it is possible to mix conic and cubic arcs in a single contour, even though no current
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font driver produces such outlines.
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* # on
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* off
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__---__
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#-__ _-- -_
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--__ _- -
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--__ # \
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--__ #
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-#
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Two "on" points
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Two "on" points and one "conic" point
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between them
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*
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# __ Two "on" points with two "conic"
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\ - - points between them. The point
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\ / \ marked '0' is the middle of the
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- 0 \ "off" points, and is a 'virtual'
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-_ _- # "on" point where the curve passes.
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-- It does not appear in the point
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list.
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*
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* # on
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* * off
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__---__
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_-- -_
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_- -
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# \
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#
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Two "on" points
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and two "cubic" point
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between them
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Each glyph's original outline points are located on a grid of indivisible units. The points are stored
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in the font file as 16-bit integer grid coordinates, with the grid origin's being at (0,0); they thus
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range from -16384 to 16383.
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Convert conic to bezier arcs:
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Conic P0 P1 P2
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Bezier B0 B1 B2 B3
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B0=P0
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B1=(P0+2*P1)/3
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B2=(P2+2*P1)/3
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B3=P2
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*//****/
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static VFontData *objfnt_to_ftvfontdata(PackedFile * pf)
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{
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// Blender
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VFontData *vfd;
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struct Nurb *nu;
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struct BezTriple *bezt;
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// Freetype2
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FT_Face face;
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FT_GlyphSlot glyph;
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FT_UInt glyph_index;
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FT_Outline ftoutline;
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float scale= 1. / 1024.; //needs text_height from metrics to make a standard linedist
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float dx, dy;
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int i, j, k, l, m; /* uhoh, kiddie C loops */
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/* i = characters, j = curves/contours, k = points, l = curvepoint, m = first point on curve */
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// test is used for BIF_printf
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char test[2];
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// load the freetype font
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err = FT_New_Memory_Face( library,
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pf->data,
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pf->size,
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0,
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&face );
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if(err) return NULL;
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// allocate blender font
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vfd= MEM_callocN(sizeof(*vfd), "FTVFontData");
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//FT_Set_Charmap(face, ft_encoding_symbol);
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// extract generic ascii character range (needs international support, dynamic loading of chars, etcetc)
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for(i = myMIN_ASCII; i <= myMAX_ASCII; i++) {
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int *npoints; //total points of each contour
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int *onpoints; //num points on curve
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test[0] = i;
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test[1] = '\0'; //to print character
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glyph_index = FT_Get_Char_Index( face, i );
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err = FT_Load_Glyph(face, glyph_index, FT_LOAD_NO_SCALE);
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glyph = face->glyph;
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ftoutline = glyph->outline;
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vfd->width[i] = glyph->advance.x* scale;
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// BIF_printf("sx %d sy %d", glyph->advance.x, face->glyph->metrics->text_height);
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npoints = (int *)MEM_callocN((ftoutline.n_contours)* sizeof(int),"endpoints") ;
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onpoints = (int *)MEM_callocN((ftoutline.n_contours)* sizeof(int),"onpoints") ;
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// calculate total points of each contour
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for(j = 0; j < ftoutline.n_contours; j++) {
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if(j == 0)
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npoints[j] = ftoutline.contours[j] + 1;
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else
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npoints[j] = ftoutline.contours[j] - ftoutline.contours[j - 1];
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}
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// get number of on-curve points for beziertriples (including conic virtual on-points)
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for(j = 0; j < ftoutline.n_contours; j++) {
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l = 0;
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for(k = 0; k < npoints[j]; k++) {
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if(j > 0) l = k + ftoutline.contours[j - 1] + 1; else l = k;
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// if(i == 67) BIF_printf("%d->%s : |k %2d|l %2d|t %2d|", i, test, k, l, ftoutline.n_points);
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if(ftoutline.tags[l] == FT_Curve_Tag_On)
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onpoints[j]++;
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if(k < npoints[j] - 1 )
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if( ftoutline.tags[l] == FT_Curve_Tag_Conic &&
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ftoutline.tags[l+1] == FT_Curve_Tag_Conic)
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onpoints[j]++;
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}
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}
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//final contour loop, bezier & conic styles merged
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for(j = 0; j < ftoutline.n_contours; j++) {
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// add new curve
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nu = (Nurb*)MEM_callocN(sizeof(struct Nurb),"objfnt_nurb");
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bezt = (BezTriple*)MEM_callocN((onpoints[j])* sizeof(BezTriple),"objfnt_bezt") ;
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BLI_addtail(&vfd->nurbsbase[i], nu);
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nu->type= CU_BEZIER+CU_2D;
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nu->pntsu = onpoints[j];
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nu->resolu= 8;
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nu->flagu= 1;
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nu->bezt = bezt;
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//individual curve loop, start-end
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for(k = 0; k < npoints[j]; k++) {
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if(j > 0) l = k + ftoutline.contours[j - 1] + 1; else l = k;
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if(k == 0) m = l;
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//virtual conic on-curve points
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if(k < npoints[j] - 1 )
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if( ftoutline.tags[l] == FT_Curve_Tag_Conic && ftoutline.tags[l+1] == FT_Curve_Tag_Conic) {
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dx = (ftoutline.points[l].x + ftoutline.points[l+1].x)* scale / 2.0;
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dy = (ftoutline.points[l].y + ftoutline.points[l+1].y)* scale / 2.0;
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//left handle
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bezt->vec[0][0] = (dx + (2 * ftoutline.points[l].x)* scale) / 3.0;
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bezt->vec[0][1] = (dy + (2 * ftoutline.points[l].y)* scale) / 3.0;
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//midpoint (virtual on-curve point)
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bezt->vec[1][0] = (ftoutline.points[l].x + ftoutline.points[l+1].x)* scale / 2.0;
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bezt->vec[1][1] = (ftoutline.points[l].y + ftoutline.points[l+1].y)* scale / 2.0;
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//right handle
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bezt->vec[2][0] = (dx + (2 * ftoutline.points[l+1].x)* scale) / 3.0;
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bezt->vec[2][1] = (dy + (2 * ftoutline.points[l+1].y)* scale) / 3.0;
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bezt->h1= bezt->h2= HD_ALIGN;
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bezt++;
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}
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//on-curve points
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if(ftoutline.tags[l] == FT_Curve_Tag_On) {
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//left handle
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if(k > 0) {
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if(ftoutline.tags[l - 1] == FT_Curve_Tag_Cubic) {
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bezt->vec[0][0] = ftoutline.points[l-1].x* scale;
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bezt->vec[0][1] = ftoutline.points[l-1].y* scale;
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bezt->h1= HD_FREE;
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} else if(ftoutline.tags[l - 1] == FT_Curve_Tag_Conic) {
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bezt->vec[0][0] = (ftoutline.points[l].x + (2 * ftoutline.points[l - 1].x))* scale / 3.0;
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bezt->vec[0][1] = (ftoutline.points[l].y + (2 * ftoutline.points[l - 1].y))* scale / 3.0;
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bezt->h1= HD_FREE;
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} else {
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bezt->vec[0][0] = ftoutline.points[l].x* scale - (ftoutline.points[l].x - ftoutline.points[l-1].x)* scale / 3.0;
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bezt->vec[0][1] = ftoutline.points[l].y* scale - (ftoutline.points[l].y - ftoutline.points[l-1].y)* scale / 3.0;
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bezt->h1= HD_VECT;
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}
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} else { //first point on curve
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if(ftoutline.tags[ftoutline.contours[j]] == FT_Curve_Tag_Cubic) {
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bezt->vec[0][0] = ftoutline.points[ftoutline.contours[j]].x * scale;
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bezt->vec[0][1] = ftoutline.points[ftoutline.contours[j]].y * scale;
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bezt->h1= HD_FREE;
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} else if(ftoutline.tags[ftoutline.contours[j]] == FT_Curve_Tag_Conic) {
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bezt->vec[0][0] = (ftoutline.points[l].x + (2 * ftoutline.points[ftoutline.contours[j]].x))* scale / 3.0 ;
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bezt->vec[0][1] = (ftoutline.points[l].y + (2 * ftoutline.points[ftoutline.contours[j]].y))* scale / 3.0 ;
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bezt->h1= HD_FREE;
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} else {
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bezt->vec[0][0] = ftoutline.points[l].x* scale - (ftoutline.points[l].x - ftoutline.points[ftoutline.contours[j]].x)* scale / 3.0;
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bezt->vec[0][1] = ftoutline.points[l].y* scale - (ftoutline.points[l].y - ftoutline.points[ftoutline.contours[j]].y)* scale / 3.0;
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bezt->h1= HD_VECT;
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}
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}
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//midpoint (on-curve point)
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bezt->vec[1][0] = ftoutline.points[l].x* scale;
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bezt->vec[1][1] = ftoutline.points[l].y* scale;
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//right handle
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if(k < (npoints[j] - 1)) {
|
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if(ftoutline.tags[l+1] == FT_Curve_Tag_Cubic) {
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bezt->vec[2][0] = ftoutline.points[l+1].x* scale;
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bezt->vec[2][1] = ftoutline.points[l+1].y* scale;
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bezt->h2= HD_FREE;
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} else if(ftoutline.tags[l+1] == FT_Curve_Tag_Conic) {
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bezt->vec[2][0] = (ftoutline.points[l].x + (2 * ftoutline.points[l+1].x))* scale / 3.0;
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bezt->vec[2][1] = (ftoutline.points[l].y + (2 * ftoutline.points[l+1].y))* scale / 3.0;
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bezt->h2= HD_FREE;
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} else {
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bezt->vec[2][0] = ftoutline.points[l].x* scale - (ftoutline.points[l].x - ftoutline.points[l+1].x)* scale / 3.0;
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bezt->vec[2][1] = ftoutline.points[l].y* scale - (ftoutline.points[l].y - ftoutline.points[l+1].y)* scale / 3.0;
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bezt->h2= HD_VECT;
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}
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} else { //last point on curve
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if(ftoutline.tags[m] == FT_Curve_Tag_Cubic) {
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// okee("hhuh");
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bezt->vec[2][0] = ftoutline.points[m].x* scale;
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bezt->vec[2][1] = ftoutline.points[m].y* scale;
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bezt->h2= HD_FREE;
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} else if(ftoutline.tags[m] == FT_Curve_Tag_Conic) {
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bezt->vec[2][0] = (ftoutline.points[l].x + (2 * ftoutline.points[m].x))* scale / 3.0 ;
|
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bezt->vec[2][1] = (ftoutline.points[l].y + (2 * ftoutline.points[m].y))* scale / 3.0 ;
|
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bezt->h2= HD_FREE;
|
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} else {
|
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bezt->vec[2][0] = ftoutline.points[l].x* scale - (ftoutline.points[l].x - ftoutline.points[m].x)* scale / 3.0;
|
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bezt->vec[2][1] = ftoutline.points[l].y* scale - (ftoutline.points[l].y - ftoutline.points[m].y)* scale / 3.0;
|
||||
bezt->h2= HD_VECT;
|
||||
}
|
||||
}
|
||||
|
||||
// get the handles that are aligned, tricky...
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||||
// DistVL2Dfl, check if the three beztriple points are on one line
|
||||
// VecLenf, see if there's a distance between the three points
|
||||
// VecLenf again, to check the angle between the handles
|
||||
// finally, check if one of them is a vector handle
|
||||
if((DistVL2Dfl(bezt->vec[0],bezt->vec[1],bezt->vec[2]) < 0.001) &&
|
||||
(VecLenf(bezt->vec[0], bezt->vec[1]) > 0.0001) &&
|
||||
(VecLenf(bezt->vec[1], bezt->vec[2]) > 0.0001) &&
|
||||
(VecLenf(bezt->vec[0], bezt->vec[2]) > 0.0002) &&
|
||||
(VecLenf(bezt->vec[0], bezt->vec[2]) > MAX2(VecLenf(bezt->vec[0], bezt->vec[1]), VecLenf(bezt->vec[1], bezt->vec[2]))) &&
|
||||
bezt->h1 != HD_VECT && bezt->h2 != HD_VECT)
|
||||
{
|
||||
bezt->h1= bezt->h2= HD_ALIGN;
|
||||
}
|
||||
bezt++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(npoints) MEM_freeN(npoints);
|
||||
if(onpoints) MEM_freeN(onpoints);
|
||||
}
|
||||
return vfd;
|
||||
}
|
||||
|
||||
|
||||
static int check_freetypefont(PackedFile * pf)
|
||||
{
|
||||
FT_Face face;
|
||||
FT_GlyphSlot glyph;
|
||||
FT_UInt glyph_index;
|
||||
|
||||
int success = 0;
|
||||
|
||||
err = FT_New_Memory_Face( library,
|
||||
pf->data,
|
||||
pf->size,
|
||||
0,
|
||||
&face );
|
||||
if(err) {
|
||||
success = 0;
|
||||
error("This is not a valid font");
|
||||
}
|
||||
else {
|
||||
glyph_index = FT_Get_Char_Index( face, 'A' );
|
||||
err = FT_Load_Glyph(face, glyph_index, FT_LOAD_NO_BITMAP );
|
||||
if(err) success = 0;
|
||||
else {
|
||||
glyph = face->glyph;
|
||||
if (glyph->format == ft_glyph_format_outline ) {
|
||||
success = 1;
|
||||
} else {
|
||||
error("Selected Font has no outline data");
|
||||
success = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return success;
|
||||
}
|
||||
|
||||
|
||||
VFontData *BLI_vfontdata_from_freetypefont(PackedFile *pf)
|
||||
{
|
||||
VFontData *vfd= NULL;
|
||||
int success = 0;
|
||||
|
||||
//init Freetype
|
||||
err = FT_Init_FreeType( &library);
|
||||
if(err) {
|
||||
error("Failed loading Freetype font library");
|
||||
return 0;
|
||||
}
|
||||
|
||||
success = check_freetypefont(pf);
|
||||
|
||||
if (success) {
|
||||
vfd= objfnt_to_ftvfontdata(pf);
|
||||
}
|
||||
|
||||
//free Freetype
|
||||
FT_Done_FreeType( library);
|
||||
|
||||
return vfd;
|
||||
}
|
||||
|
||||
#endif // WITH_FREETYPE2
|
||||
Reference in New Issue
Block a user