[embolden] Shuffle under hb_outline_t
This commit is contained in:
Behdad Esfahbod
parent
7774bccb48
commit
fda2f6f64e
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@ -47,10 +47,36 @@ struct hb_outline_point_t
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type_t type;
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};
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struct hb_outline_vector_t
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{
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float normalize_len ()
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{
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float len = hypotf (x, y);
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if (len)
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{
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x /= len;
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y /= len;
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}
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return len;
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}
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float x, y;
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};
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struct hb_outline_t
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{
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void replay (hb_draw_funcs_t *pen, void *pen_data) const
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{
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void reset () { points.shrink (0, false); contours.resize (0); }
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HB_INTERNAL void replay (hb_draw_funcs_t *pen, void *pen_data) const;
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HB_INTERNAL float area () const;
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HB_INTERNAL void embolden (float x_strength, float y_strength);
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hb_vector_t<hb_outline_point_t> points;
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hb_vector_t<unsigned> contours;
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};
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void hb_outline_t::replay (hb_draw_funcs_t *pen, void *pen_data) const
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{
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hb_draw_state_t st = HB_DRAW_STATE_DEFAULT;
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unsigned first = 0;
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@ -97,10 +123,10 @@ struct hb_outline_t
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pen->close_path (pen_data, st);
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first = contour;
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}
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}
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}
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float area () const
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{
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float hb_outline_t::area () const
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{
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float a = 0;
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unsigned first = 0;
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for (unsigned contour : contours)
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@ -117,11 +143,116 @@ struct hb_outline_t
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first = contour;
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}
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return a * .5f;
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}
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void hb_outline_t::embolden (float x_strength, float y_strength)
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{
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if (!x_strength && !y_strength) return;
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if (!points) return;
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x_strength /= 2.f;
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y_strength /= 2.f;
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bool orientation_negative = area () < 0;
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signed first = 0;
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for (unsigned c = 0; c < contours.length; c++)
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{
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hb_outline_vector_t in, out, anchor, shift;
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float l_in, l_out, l_anchor = 0, l, q, d;
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l_in = 0;
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signed last = (int) contours[c] - 1;
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/* pacify compiler */
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in.x = in.y = anchor.x = anchor.y = 0;
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/* Counter j cycles though the points; counter i advances only */
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/* when points are moved; anchor k marks the first moved point. */
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for ( signed i = last, j = first, k = -1;
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j != i && i != k;
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j = j < last ? j + 1 : first )
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{
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if ( j != k )
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{
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out.x = points[j].x - points[i].x;
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out.y = points[j].y - points[i].y;
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l_out = out.normalize_len ();
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if ( l_out == 0 )
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continue;
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}
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else
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{
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out = anchor;
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l_out = l_anchor;
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}
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hb_vector_t<hb_outline_point_t> points;
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hb_vector_t<unsigned> contours;
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};
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if ( l_in != 0 )
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{
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if ( k < 0 )
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{
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k = i;
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anchor = in;
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l_anchor = l_in;
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}
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d = in.x * out.x + in.y * out.y;
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/* shift only if turn is less than ~160 degrees */
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if ( d > -15.f/16.f )
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{
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d = d + 1.f;
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/* shift components along lateral bisector in proper orientation */
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shift.x = in.y + out.y;
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shift.y = in.x + out.x;
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if ( orientation_negative )
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shift.x = -shift.x;
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else
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shift.y = -shift.y;
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/* restrict shift magnitude to better handle collapsing segments */
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q = out.x * in.y - out.y * in.x;
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if ( orientation_negative )
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q = -q;
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l = hb_min (l_in, l_out);
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/* non-strict inequalities avoid divide-by-zero when q == l == 0 */
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if (x_strength * q <= l * d)
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shift.x = shift.x * x_strength / d;
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else
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shift.x = shift.x * l / q;
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if (y_strength * q <= l * d)
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shift.y = shift.y * y_strength / d;
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else
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shift.y = shift.y * l / q;
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}
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else
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shift.x = shift.y = 0;
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for ( ;
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i != j;
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i = i < last ? i + 1 : first )
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{
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points[i].x += x_strength + shift.x;
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points[i].y += y_strength + shift.y;
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}
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}
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else
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i = j;
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in = out;
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l_in = l_out;
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}
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first = last + 1;
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}
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}
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static void
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hb_outline_recording_pen_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
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@ -223,138 +354,4 @@ hb_outline_recording_pen_get_funcs ()
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}
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struct hb_draw_embolden_context_t : hb_outline_t
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{
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void operator () (float x_strength, float y_strength)
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{
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if (!x_strength && !y_strength) return;
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if (!points) return;
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x_strength /= 2.f;
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y_strength /= 2.f;
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bool orientation_negative = area () < 0;
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struct vector_t
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{
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float normalize_len ()
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{
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float len = hypotf (x, y);
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if (len)
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{
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x /= len;
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y /= len;
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}
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return len;
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}
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float x, y;
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};
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signed first = 0;
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for (unsigned c = 0; c < contours.length; c++)
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{
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vector_t in, out, anchor, shift;
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float l_in, l_out, l_anchor = 0, l, q, d;
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l_in = 0;
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signed last = (int) contours[c] - 1;
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/* pacify compiler */
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in.x = in.y = anchor.x = anchor.y = 0;
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/* Counter j cycles though the points; counter i advances only */
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/* when points are moved; anchor k marks the first moved point. */
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for ( signed i = last, j = first, k = -1;
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j != i && i != k;
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j = j < last ? j + 1 : first )
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{
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if ( j != k )
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{
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out.x = points[j].x - points[i].x;
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out.y = points[j].y - points[i].y;
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l_out = out.normalize_len ();
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if ( l_out == 0 )
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continue;
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}
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else
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{
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out = anchor;
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l_out = l_anchor;
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}
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if ( l_in != 0 )
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{
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if ( k < 0 )
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{
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k = i;
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anchor = in;
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l_anchor = l_in;
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}
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d = in.x * out.x + in.y * out.y;
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/* shift only if turn is less than ~160 degrees */
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if ( d > -15.f/16.f )
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{
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d = d + 1.f;
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/* shift components along lateral bisector in proper orientation */
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shift.x = in.y + out.y;
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shift.y = in.x + out.x;
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if ( orientation_negative )
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shift.x = -shift.x;
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else
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shift.y = -shift.y;
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/* restrict shift magnitude to better handle collapsing segments */
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q = out.x * in.y - out.y * in.x;
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if ( orientation_negative )
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q = -q;
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l = hb_min (l_in, l_out);
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/* non-strict inequalities avoid divide-by-zero when q == l == 0 */
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if (x_strength * q <= l * d)
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shift.x = shift.x * x_strength / d;
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else
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shift.x = shift.x * l / q;
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if (y_strength * q <= l * d)
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shift.y = shift.y * y_strength / d;
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else
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shift.y = shift.y * l / q;
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}
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else
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shift.x = shift.y = 0;
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for ( ;
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i != j;
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i = i < last ? i + 1 : first )
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{
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points[i].x += x_strength + shift.x;
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points[i].y += y_strength + shift.y;
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}
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}
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else
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i = j;
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in = out;
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l_in = l_out;
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}
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first = last + 1;
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}
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}
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};
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static hb_draw_funcs_t *
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hb_draw_embolden_get_funcs ()
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{
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return hb_outline_recording_pen_get_funcs ();
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}
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#endif /* HB_DRAW_EMBOLDEN_HH */
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@ -464,10 +464,10 @@ hb_ot_draw_glyph (hb_font_t *font,
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void *user_data)
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{
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hb_draw_embolden_context_t emboldener;
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auto *embolden_funcs = hb_draw_embolden_get_funcs ();
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hb_outline_t outline;
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auto *pen = hb_outline_recording_pen_get_funcs ();
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hb_draw_session_t draw_session (embolden_funcs, &emboldener, font->slant_xy);
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hb_draw_session_t draw_session (pen, &outline, font->slant_xy);
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if (!font->face->table.glyf->get_path (font, glyph, draw_session))
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#ifndef HB_NO_CFF
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if (!font->face->table.cff1->get_path (font, glyph, draw_session))
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@ -477,8 +477,8 @@ hb_ot_draw_glyph (hb_font_t *font,
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float xstr = font->x_scale / 20;
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float ystr = font->y_scale / 20;
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emboldener (xstr, ystr);
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emboldener.replay (draw_funcs, draw_data);
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outline.embolden (xstr, ystr);
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outline.replay (draw_funcs, draw_data);
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}
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#endif
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