/*
- freetype.cc -- implement Freetype routines.
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2004--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "freetype.hh"
#include "warn.hh"
+#include FT_OUTLINE_H
+#include FT_BBOX_H
+
FT_Library freetype2_library;
void
init_freetype ()
{
- int errorcode = FT_Init_FreeType (&freetype2_library);
+ FT_Error errorcode = FT_Init_FreeType (&freetype2_library);
if (errorcode)
- error ("can't initialize FreeType");
+ error ("cannot initialize FreeType");
+}
+
+Box
+ly_FT_get_unscaled_indexed_char_dimensions (FT_Face const &face, size_t signed_idx)
+{
+ FT_UInt idx = FT_UInt (signed_idx);
+ FT_Load_Glyph (face, idx, FT_LOAD_NO_SCALE);
+
+ FT_Glyph_Metrics m = face->glyph->metrics;
+ FT_Pos hb = m.horiBearingX;
+ FT_Pos vb = m.horiBearingY;
+
+ // is this viable for all grobs?
+ return Box (Interval (Real (hb), Real (hb + m.width)),
+ Interval (Real (vb - m.height), Real (vb)));
}
+SCM
+box_to_scheme_lines (Box b)
+{
+ return scm_list_4 (scm_list_4 (scm_from_double (b[X_AXIS][LEFT]),
+ scm_from_double (b[Y_AXIS][DOWN]),
+ scm_from_double (b[X_AXIS][RIGHT]),
+ scm_from_double (b[Y_AXIS][DOWN])),
+ scm_list_4 (scm_from_double (b[X_AXIS][RIGHT]),
+ scm_from_double (b[Y_AXIS][DOWN]),
+ scm_from_double (b[X_AXIS][RIGHT]),
+ scm_from_double (b[Y_AXIS][UP])),
+ scm_list_4 (scm_from_double (b[X_AXIS][RIGHT]),
+ scm_from_double (b[Y_AXIS][UP]),
+ scm_from_double (b[X_AXIS][LEFT]),
+ scm_from_double (b[Y_AXIS][UP])),
+ scm_list_4 (scm_from_double (b[X_AXIS][LEFT]),
+ scm_from_double (b[Y_AXIS][UP]),
+ scm_from_double (b[X_AXIS][LEFT]),
+ scm_from_double (b[Y_AXIS][DOWN])));
+}
+
+Box
+ly_FT_get_glyph_outline_bbox (FT_Face const &face, size_t signed_idx)
+{
+ FT_UInt idx = FT_UInt (signed_idx);
+ FT_Load_Glyph (face, idx, FT_LOAD_NO_SCALE);
+
+ if (!(face->glyph->format == FT_GLYPH_FORMAT_OUTLINE))
+ {
+#if 0
+ // will generate a lot of warnings
+ warning ("Cannot make glyph outline");
+#endif
+ return Box (Interval (infinity_f, -infinity_f), Interval (infinity_f, -infinity_f));
+ }
+ FT_Outline *outline;
+ outline = &(face->glyph->outline);
+
+ FT_BBox bbox;
+ FT_Outline_Get_BBox (outline, &bbox);
+
+ return Box (Interval (bbox.xMin, bbox.xMax), Interval (bbox.yMin, bbox.yMax));
+}
+
+SCM
+ly_FT_get_glyph_outline (FT_Face const &face, size_t signed_idx)
+{
+ FT_UInt idx = FT_UInt (signed_idx);
+ FT_Load_Glyph (face, idx, FT_LOAD_NO_SCALE);
+
+ if (!(face->glyph->format == FT_GLYPH_FORMAT_OUTLINE))
+ {
+#if 0
+ // will generate a lot of warnings
+ warning ("Cannot make glyph outline");
+#endif
+ return box_to_scheme_lines (ly_FT_get_unscaled_indexed_char_dimensions (face, signed_idx));
+ }
+
+ FT_Outline *outline;
+ outline = &(face->glyph->outline);
+ SCM out = SCM_EOL;
+ Offset lastpos;
+ Offset firstpos;
+ int j = 0;
+ while (j < outline->n_points)
+ {
+ if (j == 0)
+ {
+ firstpos = Offset (outline->points[j].x, outline->points[j].y);
+ lastpos = firstpos;
+ j++;
+ }
+ else if (outline->tags[j] & 1)
+ {
+ // it is a line
+ out = scm_cons (scm_list_4 (scm_from_double (lastpos[X_AXIS]),
+ scm_from_double (lastpos[Y_AXIS]),
+ scm_from_double (outline->points[j].x),
+ scm_from_double (outline->points[j].y)),
+ out);
+ lastpos = Offset (outline->points[j].x, outline->points[j].y);
+ j++;
+ }
+ else if (outline->tags[j] & 2)
+ {
+ // it is a third order bezier
+ out = scm_cons (scm_list_n (scm_from_double (lastpos[X_AXIS]),
+ scm_from_double (lastpos[Y_AXIS]),
+ scm_from_double (outline->points[j].x),
+ scm_from_double (outline->points[j].y),
+ scm_from_double (outline->points[j + 1].x),
+ scm_from_double (outline->points[j + 1].y),
+ scm_from_double (outline->points[j + 2].x),
+ scm_from_double (outline->points[j + 2].y),
+ SCM_UNDEFINED),
+ out);
+ lastpos = Offset (outline->points[j + 2].x, outline->points[j + 2].y);
+ j += 3;
+ }
+ else
+ {
+ // it is a second order bezier
+ Real x0 = lastpos[X_AXIS];
+ Real x1 = outline->points[j].x;
+ Real x2 = outline->points[j + 1].x;
+
+ Real y0 = lastpos[Y_AXIS];
+ Real y1 = outline->points[j].y;
+ Real y2 = outline->points[j + 1].y;
+
+ Real qx2 = x0 + x2 - (2 * x1);
+ Real qx1 = (2 * x1) - (2 * x0);
+ Real qx0 = x0;
+
+ Real qy2 = y0 + y2 - (2 * y1);
+ Real qy1 = (2 * y1) - (2 * y0);
+ Real qy0 = y0;
+
+ Real cx0 = qx0;
+ Real cx1 = qx0 + (qx1 / 3);
+ Real cx2 = qx0 + (2 * qx1 / 3) + (qx2 / 3);
+ Real cx3 = qx0 + qx1 + qx2;
+
+ Real cy0 = qy0;
+ Real cy1 = qy0 + (qy1 / 3);
+ Real cy2 = qy0 + (2 * qy1 / 3) + (qy2 / 3);
+ Real cy3 = qy0 + qy1 + qy2;
+
+ out = scm_cons (scm_list_n (scm_from_double (cx0),
+ scm_from_double (cy0),
+ scm_from_double (cx1),
+ scm_from_double (cy1),
+ scm_from_double (cx2),
+ scm_from_double (cy2),
+ scm_from_double (cx3),
+ scm_from_double (cy3),
+ SCM_UNDEFINED),
+ out);
+ lastpos = Offset (outline->points[j + 1].x, outline->points[j + 1].y);
+ j += 2;
+ }
+ }
+
+ // just in case, close the figure
+ out = scm_cons (scm_list_4 (scm_from_double (lastpos[X_AXIS]),
+ scm_from_double (lastpos[Y_AXIS]),
+ scm_from_double (firstpos[X_AXIS]),
+ scm_from_double (firstpos[Y_AXIS])),
+ out);
+
+ out = scm_reverse_x (out, SCM_EOL);
+ return out;
+}
projects / lilypond.git / blobdiff