X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstencil-scheme.cc;h=a603f01b5f5c9b123cbd1638bfb462cd4a1b268e;hb=47db9a3883d726ca53e2133a3b2298f78dd6a32e;hp=44beeb460057a534cb1e5130cc00db1a37c00074;hpb=28976d28a04cfb9abe97af7214d7dce11f732604;p=lilypond.git diff --git a/lily/stencil-scheme.cc b/lily/stencil-scheme.cc index 44beeb4600..ebf3cd6c15 100644 --- a/lily/stencil-scheme.cc +++ b/lily/stencil-scheme.cc @@ -1,227 +1,473 @@ /* - stencil-scheme.cc -- implement Stencil scheme accessors + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter + Copyright (C) 1997--2015 Han-Wen Nienhuys - (c) 1997--2004 Han-Wen Nienhuys + 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 . */ #include "font-metric.hh" +#include "libc-extension.hh" +#include "lookup.hh" #include "stencil.hh" /* TODO: naming add/combine. - */ -/* - UMGH. junkme! - - */ -LY_DEFINE (ly_stencil_set_extent_x, "ly:stencil-set-extent!", - 3, 0, 0, (SCM stil, SCM axis, SCM np), - "Set the extent of @var{stil} " - "(@var{extent} must be a pair of numbers) " - "in @var{axis} direction (0 or 1 for x- and y-axis respectively).") -{ - Stencil *s = unsmob_stencil (stil); - SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil"); - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis"); - SCM_ASSERT_TYPE (is_number_pair (np), np, SCM_ARG3, __FUNCTION__, - "number pair"); +*/ - Interval iv = ly_scm2interval (np); - s->dim_[Axis (ly_scm2int (axis))] = iv; +LY_DEFINE (ly_stencil_translate_axis, "ly:stencil-translate-axis", + 3, 0, 0, (SCM stil, SCM amount, SCM axis), + "Return a copy of @var{stil} but translated by @var{amount}" + " in @var{axis} direction.") +{ + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (scm_is_number, amount, 2); - return SCM_UNDEFINED; -} + LY_ASSERT_TYPE (is_axis, axis, 3); -LY_DEFINE (ly_translate_stencil_axis, "ly:stencil-translate-axis", - 3, 0, 0, (SCM stil, SCM amount, SCM axis), - "Return a copy of @var{stil} but translated by @var{amount} in @var{axis} direction.") -{ - Stencil *s = unsmob_stencil (stil); - SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil"); - SCM_ASSERT_TYPE (is_number (amount), amount, SCM_ARG2, __FUNCTION__, "number pair"); - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis"); + Real real_amount = scm_to_double (amount); SCM new_s = s->smobbed_copy (); - Stencil *q = unsmob_stencil (new_s); - q->translate_axis (ly_scm2double (amount), Axis (ly_scm2int (axis))); - return new_s; + scm_remember_upto_here_1 (stil); + Stencil *q = Stencil::unsmob (new_s); + q->translate_axis (real_amount, Axis (scm_to_int (axis))); + return new_s; } -LY_DEFINE (ly_translate_stencil, "ly:stencil-translate", - 2, 0, 0, (SCM stil, SCM offset), - "Return a @var{stil}, " - "but translated by @var{offset} (a pair of numbers).") +LY_DEFINE (ly_stencil_translate, "ly:stencil-translate", + 2, 0, 0, (SCM stil, SCM offset), + "Return a @var{stil}, but translated by @var{offset}" + " (a pair of numbers).") { - Stencil *s = unsmob_stencil (stil); - SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil"); - SCM_ASSERT_TYPE (is_number_pair (offset), offset, SCM_ARG2, __FUNCTION__, "number pair"); + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (is_number_pair, offset, 2); Offset o = ly_scm2offset (offset); SCM new_s = s->smobbed_copy (); - Stencil *q =unsmob_stencil (new_s); + scm_remember_upto_here_1 (stil); + + Stencil *q = Stencil::unsmob (new_s); q->translate (o); return new_s; } -LY_DEFINE (ly_stencil_get_expr, "ly:stencil-get-expr", - 1, 0, 0, (SCM stil), - "Return the expression of @var{stil}.") +LY_DEFINE (ly_stencil_expr, "ly:stencil-expr", + 1, 0, 0, (SCM stil), + "Return the expression of @var{stil}.") { - Stencil *s = unsmob_stencil (stil); - SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil"); - return s->get_expr (); + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + return s->expr (); } -LY_DEFINE (ly_stencil_get_extent, "ly:stencil-extent", - 2, 0, 0, (SCM stil, SCM axis), - "Return a pair of numbers signifying the extent of @var{stil} in " - "@var{axis} direction (0 or 1 for x and y axis respectively).") +LY_DEFINE (ly_stencil_extent, "ly:stencil-extent", + 2, 0, 0, (SCM stil, SCM axis), + "Return a pair of numbers signifying the extent of @var{stil} in" + " @var{axis} direction (@code{0} or @code{1} for x and" + " y@tie{}axis, respectively).") { - Stencil *s = unsmob_stencil (stil); - SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil"); - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis"); + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (is_axis, axis, 2); + + return ly_interval2scm (s->extent (Axis (scm_to_int (axis)))); +} - return ly_interval2scm (s->extent (Axis (ly_scm2int (axis)))); +LY_DEFINE (ly_stencil_empty_p, "ly:stencil-empty?", + 1, 1, 0, (SCM stil, SCM axis), + "Return whether @var{stil} is empty. If an optional" + " @var{axis} is supplied, the emptiness check is" + " restricted to that axis.") +{ + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + if (SCM_UNBNDP (axis)) + return scm_from_bool (s->is_empty ()); + LY_ASSERT_TYPE (is_axis, axis, 2); + return scm_from_bool (s->is_empty (Axis (scm_to_int (axis)))); } -LY_DEFINE (ly_stencil_moved_to_edge, "ly:stencil-moved-to-edge", - 4, 2, 0, (SCM first, SCM axis, SCM direction, SCM second, - SCM padding, SCM minimum), - "Similar to @code{ly:stencil-combine-edge}, but returns " - "@var{second} positioned to be next to @var{first}. ") +LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge", + 4, 1, 0, (SCM first, SCM axis, SCM direction, + SCM second, + SCM padding), + "Construct a stencil by putting @var{second} next to @var{first}." + " @var{axis} can be 0 (x-axis) or@tie{}1 (y-axis)." + " @var{direction} can be -1 (left or down) or@tie{}1 (right or" + " up). The stencils are juxtaposed with @var{padding} as extra" + " space. @var{first} and @var{second} may also be @code{'()} or" + " @code{#f}.") { - /* - C&P from combine-at-edge. - */ - Stencil *s1 = unsmob_stencil (first); - Stencil *s2 = unsmob_stencil (second); - Stencil first_stencil; + Stencil *s1 = Stencil::unsmob (first); + Stencil *s2 = Stencil::unsmob (second); + Stencil result; - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis"); - SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir"); + SCM_ASSERT_TYPE (s1 || first == SCM_BOOL_F || first == SCM_EOL, + first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()"); + SCM_ASSERT_TYPE (s2 || second == SCM_BOOL_F || second == SCM_EOL, + second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()"); + LY_ASSERT_TYPE (is_axis, axis, 2); + LY_ASSERT_TYPE (is_direction, direction, 3); Real p = 0.0; if (padding != SCM_UNDEFINED) { - SCM_ASSERT_TYPE (is_number (padding), padding, SCM_ARG5, __FUNCTION__, "number"); - p = ly_scm2double (padding); - } - Real m = 0.0; - if (minimum != SCM_UNDEFINED) - { - SCM_ASSERT_TYPE (is_number (minimum), minimum, SCM_ARG6, __FUNCTION__, "number"); - m = ly_scm2double (minimum); + LY_ASSERT_TYPE (scm_is_number, padding, 5); + p = scm_to_double (padding); } if (s1) - first_stencil = *s1; + result = *s1; if (s2) - return first_stencil.moved_to_edge (Axis (ly_scm2int (axis)), - Direction (ly_scm2int (direction)), - *s2, p, m).smobbed_copy (); - else - return Stencil().smobbed_copy (); -} + result.add_at_edge (Axis (scm_to_int (axis)), + Direction (scm_to_int (direction)), *s2, p); + scm_remember_upto_here_2 (first, second); - -LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge", - 4, 2, 0, (SCM first, SCM axis, SCM direction, - SCM second, - SCM padding, - SCM minimum), - "Construct a stencil by putting @var{second} next to @var{first}. " - "@var{axis} can be 0 (x-axis) or 1 (y-axis), " - "@var{direction} can be -1 (left or down) or 1 (right or up). " - "The stencils are juxtaposed with @var{padding} as extra space. " - "If this puts the reference points closer than @var{minimum}, " - "they are moved by the latter amount.") -{ - Stencil *s1 = unsmob_stencil (first); - Stencil *s2 = unsmob_stencil (second); + return result.smobbed_copy (); +} + +LY_DEFINE (ly_stencil_stack, "ly:stencil-stack", + 4, 2, 0, (SCM first, SCM axis, SCM direction, + SCM second, + SCM padding, + SCM mindist), + "Construct a stencil by stacking @var{second} next to @var{first}." + " @var{axis} can be 0 (x-axis) or@tie{}1 (y-axis)." + " @var{direction} can be -1 (left or down) or@tie{}1 (right or" + " up). The stencils are juxtaposed with @var{padding} as extra" + " space. @var{first} and @var{second} may also be @code{'()} or" + " @code{#f}. As opposed to @code{ly:stencil-combine-at-edge}," + " metrics are suited for successively accumulating lines of" + " stencils. Also, @var{second} stencil is drawn last.\n\n" + "If @var{mindist} is specified, reference points are placed" + " apart at least by this distance. If either of the stencils" + " is spacing, @var{padding} and @var{mindist} do not apply.") +{ + Stencil *s1 = Stencil::unsmob (first); + Stencil *s2 = Stencil::unsmob (second); Stencil result; - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis"); - SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir"); + SCM_ASSERT_TYPE (s1 || first == SCM_BOOL_F || first == SCM_EOL, + first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()"); + SCM_ASSERT_TYPE (s2 || second == SCM_BOOL_F || second == SCM_EOL, + second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()"); + LY_ASSERT_TYPE (is_axis, axis, 2); + LY_ASSERT_TYPE (is_direction, direction, 3); Real p = 0.0; if (padding != SCM_UNDEFINED) { - SCM_ASSERT_TYPE (is_number (padding), padding, SCM_ARG5, __FUNCTION__, "number"); - p = ly_scm2double (padding); + LY_ASSERT_TYPE (scm_is_number, padding, 5); + p = scm_to_double (padding); } - Real m = 0.0; - if (minimum != SCM_UNDEFINED) + Real d = -infinity_f; + if (!SCM_UNBNDP (mindist)) { - SCM_ASSERT_TYPE (is_number (minimum), minimum, SCM_ARG6, __FUNCTION__, "number"); - m = ly_scm2double (minimum); + LY_ASSERT_TYPE (scm_is_number, mindist, 6); + d = scm_to_double (mindist); } if (s1) result = *s1; + if (s2) - result.add_at_edge (Axis (ly_scm2int (axis)), - Direction (ly_scm2int (direction)), *s2, p, m); + result.stack (Axis (scm_to_int (axis)), + Direction (scm_to_int (direction)), *s2, p, d); + + scm_remember_upto_here_2 (first, second); return result.smobbed_copy (); } -LY_DEFINE (ly_stencil_add , "ly:stencil-add", - 0, 0, 1, (SCM args), - "Combine stencils. Takes any number of arguments.") +LY_DEFINE (ly_stencil_add, "ly:stencil-add", + 0, 0, 1, (SCM args), + "Combine stencils. Takes any number of arguments.") { #define FUNC_NAME __FUNCTION__ SCM_VALIDATE_REST_ARGUMENT (args); - Stencil result; + SCM expr = SCM_EOL; + SCM cs = ly_symbol2scm ("combine-stencil"); + + Box extent; + extent.set_empty (); while (!SCM_NULLP (args)) { - Stencil *s = unsmob_stencil (ly_car (args)); + Stencil *s = Stencil::unsmob (scm_car (args)); if (!s) - SCM_ASSERT_TYPE (s, ly_car (args), SCM_ARGn, __FUNCTION__, "Stencil"); - - result.add_stencil (*s); - args = ly_cdr (args); + SCM_ASSERT_TYPE (s, scm_car (args), SCM_ARGn, __FUNCTION__, "Stencil"); + + extent.unite (s->extent_box ()); + if (scm_is_pair (s->expr ()) && scm_is_eq (cs, s->expr ())) + { + expr = scm_reverse_x (scm_list_copy (scm_cdr (s->expr ())), + expr); + } + else + expr = scm_cons (s->expr (), expr); + + args = scm_cdr (args); } - return result.smobbed_copy (); + expr = scm_cons (cs, scm_reverse_x (expr, SCM_EOL)); + return Stencil (extent, expr).smobbed_copy (); } LY_DEFINE (ly_make_stencil, "ly:make-stencil", - 3, 0, 0, (SCM expr, SCM xext, SCM yext), - " \n" - "Stencils are a device independent output expressions." - "They carry two pieces of information: \n\n" - "1: a specification of how to print this object. " - "This specification is processed by the output backends, " - " for example @file{scm/output-tex.scm}.\n\n" - "2: the vertical and horizontal extents of the object.\n\n") -{ - SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG2, __FUNCTION__, "number pair"); - SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG3, __FUNCTION__, "number pair"); - - Box b (ly_scm2interval (xext), ly_scm2interval (yext)); + 1, 2, 0, (SCM expr, SCM xext, SCM yext), + "Stencils are device independent output expressions." + " They carry two pieces of information:\n" + "\n" + "@enumerate\n" + "@item\n" + "A specification of how to print this object." + " This specification is processed by the output backends," + " for example @file{scm/output-ps.scm}.\n" + "\n" + "@item\n" + "The vertical and horizontal extents of the object, given as" + " pairs. If an extent is unspecified (or if you use" + " @code{empty-interval} as its value), it is taken to be empty.\n" + "@end enumerate\n") +{ + SCM_ASSERT_TYPE (!scm_is_pair (expr) + || is_stencil_head (scm_car (expr)), + expr, SCM_ARG1, __FUNCTION__, "registered stencil expression"); + + Interval x; + if (xext != SCM_UNDEFINED) + { + LY_ASSERT_TYPE (is_number_pair, xext, 2); + x = ly_scm2interval (xext); + } + + Interval y; + if (yext != SCM_UNDEFINED) + { + LY_ASSERT_TYPE (is_number_pair, yext, 3); + y = ly_scm2interval (yext); + } + + Box b (x, y); Stencil s (b, expr); return s.smobbed_copy (); } +LY_DEFINE (ly_stencil_aligned_to, "ly:stencil-aligned-to", + 3, 0, 0, (SCM stil, SCM axis, SCM dir), + "Align @var{stil} using its own extents. @var{dir} is a number." + " @w{@code{-1}} and @code{1} are left and right, respectively." + " Other values are interpolated (so @code{0} means the center).") +{ + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (is_axis, axis, 2); + LY_ASSERT_TYPE (scm_is_number, dir, 3); + + Stencil target = *Stencil::unsmob (stil); + + target.align_to ((Axis)scm_to_int (axis), + scm_to_double (dir)); + return target.smobbed_copy (); +} + +LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts", + 1, 0, 0, (SCM s), + "Analyze @var{s}, and return a list of fonts used" + " in@tie{}@var{s}.") +{ + LY_ASSERT_SMOB (Stencil, s, 1); + Stencil *stil = Stencil::unsmob (s); + return find_expression_fonts (stil->expr ()); +} + +LY_DEFINE (ly_stencil_in_color, "ly:stencil-in-color", + 4, 0, 0, (SCM stc, SCM r, SCM g, SCM b), + "Put @var{stc} in a different color.") +{ + LY_ASSERT_SMOB (Stencil, stc, 1); + Stencil *stil = Stencil::unsmob (stc); + return Stencil (stil->extent_box (), + scm_list_3 (ly_symbol2scm ("color"), + scm_list_3 (r, g, b), + stil->expr ())).smobbed_copy (); +} + +struct Stencil_interpret_arguments +{ + SCM func; + SCM arg1; +}; + +SCM stencil_interpret_in_scm (void *p, SCM expr) +{ + Stencil_interpret_arguments *ap = (Stencil_interpret_arguments *) p; + return scm_call_2 (ap->func, ap->arg1, expr); +} + +LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression", + 4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset), + "Parse @var{expr}, feed bits to @var{func} with first arg" + " @var{arg1} having offset @var{offset}.") +{ + LY_ASSERT_TYPE (ly_is_procedure, func, 2); + + Stencil_interpret_arguments a; + a.func = func; + a.arg1 = arg1; + Offset o = ly_scm2offset (offset); + + interpret_stencil_expression (expr, stencil_interpret_in_scm, (void *) & a, o); -LY_DEFINE (ly_align_to_x, "ly:stencil-align-to!", - 3, 0, 0, (SCM stil, SCM axis, SCM dir), - "Align @var{stil} using its own extents. " - "@var{dir} is a number -1, 1 are left and right respectively. " - "Other values are interpolated (so 0 means the center. ") + return SCM_UNSPECIFIED; +} + +LY_DEFINE (ly_bracket, "ly:bracket", + 4, 0, 0, + (SCM a, SCM iv, SCM t, SCM p), + "Make a bracket in direction@tie{}@var{a}. The extent of the" + " bracket is given by @var{iv}. The wings protrude by an amount" + " of@tie{}@var{p}, which may be negative. The thickness is given" + " by@tie{}@var{t}.") +{ + LY_ASSERT_TYPE (is_axis, a, 1); + LY_ASSERT_TYPE (is_number_pair, iv, 2); + LY_ASSERT_TYPE (scm_is_number, t, 3); + LY_ASSERT_TYPE (scm_is_number, p, 4); + + return Lookup::bracket ((Axis)scm_to_int (a), ly_scm2interval (iv), + scm_to_double (t), + scm_to_double (p), + 0.95 * scm_to_double (t)).smobbed_copy (); +} + +LY_DEFINE (ly_stencil_rotate, "ly:stencil-rotate", + 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y), + "Return a stencil @var{stil} rotated @var{angle} degrees around" + " the relative offset (@var{x}, @var{y}). E.g., an offset of" + " (-1, 1) will rotate the stencil around the left upper corner.") +{ + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (scm_is_number, angle, 2); + LY_ASSERT_TYPE (scm_is_number, x, 3); + LY_ASSERT_TYPE (scm_is_number, y, 4); + Real a = scm_to_double (angle); + Real x_off = scm_to_double (x); + Real y_off = scm_to_double (y); + + SCM new_s = s->smobbed_copy (); + Stencil *q = Stencil::unsmob (new_s); + q->rotate_degrees (a, Offset (x_off, y_off)); + return new_s; +} + +LY_DEFINE (ly_stencil_rotate_absolute, "ly:stencil-rotate-absolute", + 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y), + "Return a stencil @var{stil} rotated @var{angle} degrees around" + " point (@var{x}, @var{y}), given in absolute coordinates.") { - SCM_ASSERT_TYPE (unsmob_stencil (stil), stil, SCM_ARG1, __FUNCTION__, "stencil"); - SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis"); - SCM_ASSERT_TYPE (is_number (dir), dir, SCM_ARG3, __FUNCTION__, "number"); + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (scm_is_number, angle, 2); + LY_ASSERT_TYPE (scm_is_number, x, 3); + LY_ASSERT_TYPE (scm_is_number, y, 4); + Real a = scm_to_double (angle); + Real x_off = scm_to_double (x); + Real y_off = scm_to_double (y); - unsmob_stencil (stil)->align_to ((Axis)ly_scm2int (axis), - ly_scm2double (dir)); - return SCM_UNDEFINED; + SCM new_s = s->smobbed_copy (); + Stencil *q = Stencil::unsmob (new_s); + q->rotate_degrees_absolute (a, Offset (x_off, y_off)); + return new_s; +} + +LY_DEFINE (ly_round_filled_box, "ly:round-filled-box", + 3, 0, 0, + (SCM xext, SCM yext, SCM blot), + "Make a @code{Stencil} object that prints a black box of" + " dimensions @var{xext}, @var{yext} and roundness @var{blot}.") +{ + LY_ASSERT_TYPE (is_number_pair, xext, 1); + LY_ASSERT_TYPE (is_number_pair, yext, 2); + LY_ASSERT_TYPE (scm_is_number, blot, 3); + + return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)), + scm_to_double (blot)).smobbed_copy (); +} + +LY_DEFINE (ly_round_filled_polygon, "ly:round-filled-polygon", + 2, 0, 0, + (SCM points, SCM blot), + "Make a @code{Stencil} object that prints a black polygon with" + " corners at the points defined by @var{points} (list of coordinate" + " pairs) and roundness @var{blot}.") +{ + SCM_ASSERT_TYPE (scm_ilength (points) > 0, points, SCM_ARG1, __FUNCTION__, "list of coordinate pairs"); + LY_ASSERT_TYPE (scm_is_number, blot, 2); + vector pts; + for (SCM p = points; scm_is_pair (p); p = scm_cdr (p)) + { + SCM scm_pt = scm_car (p); + if (scm_is_pair (scm_pt)) + { + pts.push_back (ly_scm2offset (scm_pt)); + } + else + { + // TODO: Print out warning + } + } + return Lookup::round_filled_polygon (pts, scm_to_double (blot)).smobbed_copy (); +} + +LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression", + 1, 0, 0, + (SCM symbol), + "Add @var{symbol} as head of a stencil expression.") +{ + LY_ASSERT_TYPE (ly_is_symbol, symbol, 1); + register_stencil_head (symbol); + return SCM_UNSPECIFIED; +} + +LY_DEFINE (ly_all_stencil_expressions, "ly:all-stencil-expressions", + 0, 0, 0, + (), + "Return all symbols recognized as stencil expressions.") +{ + return all_stencil_heads (); +} + +LY_DEFINE (ly_stencil_scale, "ly:stencil-scale", + 3, 0, 0, (SCM stil, SCM x, SCM y), + "Scale @var{stil} using the horizontal and vertical scaling" + " factors @var{x} and @var{y}.") +{ + Stencil *s = Stencil::unsmob (stil); + LY_ASSERT_SMOB (Stencil, stil, 1); + LY_ASSERT_TYPE (scm_is_number, x, 2); + LY_ASSERT_TYPE (scm_is_number, y, 3); + + SCM new_s = s->smobbed_copy (); + Stencil *q = Stencil::unsmob (new_s); + + q->scale (scm_to_double (x), scm_to_double (y)); + return new_s; }