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Diffstat (limited to 'libs/cairo-1.16.0/src/cairo-path-stroke-tristrip.c')
| -rw-r--r-- | libs/cairo-1.16.0/src/cairo-path-stroke-tristrip.c | 1088 |
1 files changed, 0 insertions, 1088 deletions
diff --git a/libs/cairo-1.16.0/src/cairo-path-stroke-tristrip.c b/libs/cairo-1.16.0/src/cairo-path-stroke-tristrip.c deleted file mode 100644 index 3178765..0000000 --- a/libs/cairo-1.16.0/src/cairo-path-stroke-tristrip.c +++ /dev/null @@ -1,1088 +0,0 @@ -/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ -/* cairo - a vector graphics library with display and print output - * - * Copyright © 2002 University of Southern California - * Copyright © 2011 Intel Corporation - * - * This library is free software; you can redistribute it and/or - * modify it either under the terms of the GNU Lesser General Public - * License version 2.1 as published by the Free Software Foundation - * (the "LGPL") or, at your option, under the terms of the Mozilla - * Public License Version 1.1 (the "MPL"). If you do not alter this - * notice, a recipient may use your version of this file under either - * the MPL or the LGPL. - * - * You should have received a copy of the LGPL along with this library - * in the file COPYING-LGPL-2.1; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA - * You should have received a copy of the MPL along with this library - * in the file COPYING-MPL-1.1 - * - * The contents of this file are subject to the Mozilla Public License - * Version 1.1 (the "License"); you may not use this file except in - * compliance with the License. You may obtain a copy of the License at - * http://www.mozilla.org/MPL/ - * - * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY - * OF ANY KIND, either express or implied. See the LGPL or the MPL for - * the specific language governing rights and limitations. - * - * The Original Code is the cairo graphics library. - * - * The Initial Developer of the Original Code is University of Southern - * California. - * - * Contributor(s): - * Carl D. Worth <cworth@cworth.org> - * Chris Wilson <chris@chris-wilson.co.uk> - */ - -#define _DEFAULT_SOURCE /* for hypot() */ -#include "cairoint.h" - -#include "cairo-box-inline.h" -#include "cairo-boxes-private.h" -#include "cairo-error-private.h" -#include "cairo-path-fixed-private.h" -#include "cairo-slope-private.h" -#include "cairo-tristrip-private.h" - -struct stroker { - cairo_stroke_style_t style; - - cairo_tristrip_t *strip; - - const cairo_matrix_t *ctm; - const cairo_matrix_t *ctm_inverse; - double tolerance; - cairo_bool_t ctm_det_positive; - - cairo_pen_t pen; - - cairo_bool_t has_sub_path; - - cairo_point_t first_point; - - cairo_bool_t has_current_face; - cairo_stroke_face_t current_face; - - cairo_bool_t has_first_face; - cairo_stroke_face_t first_face; - - cairo_box_t limit; - cairo_bool_t has_limits; -}; - -static inline double -normalize_slope (double *dx, double *dy); - -static void -compute_face (const cairo_point_t *point, - const cairo_slope_t *dev_slope, - struct stroker *stroker, - cairo_stroke_face_t *face); - -static void -translate_point (cairo_point_t *point, const cairo_point_t *offset) -{ - point->x += offset->x; - point->y += offset->y; -} - -static int -slope_compare_sgn (double dx1, double dy1, double dx2, double dy2) -{ - double c = (dx1 * dy2 - dx2 * dy1); - - if (c > 0) return 1; - if (c < 0) return -1; - return 0; -} - -static inline int -range_step (int i, int step, int max) -{ - i += step; - if (i < 0) - i = max - 1; - if (i >= max) - i = 0; - return i; -} - -/* - * Construct a fan around the midpoint using the vertices from pen between - * inpt and outpt. - */ -static void -add_fan (struct stroker *stroker, - const cairo_slope_t *in_vector, - const cairo_slope_t *out_vector, - const cairo_point_t *midpt, - const cairo_point_t *inpt, - const cairo_point_t *outpt, - cairo_bool_t clockwise) -{ - int start, stop, step, i, npoints; - - if (clockwise) { - step = 1; - - start = _cairo_pen_find_active_cw_vertex_index (&stroker->pen, - in_vector); - if (_cairo_slope_compare (&stroker->pen.vertices[start].slope_cw, - in_vector) < 0) - start = range_step (start, 1, stroker->pen.num_vertices); - - stop = _cairo_pen_find_active_cw_vertex_index (&stroker->pen, - out_vector); - if (_cairo_slope_compare (&stroker->pen.vertices[stop].slope_ccw, - out_vector) > 0) - { - stop = range_step (stop, -1, stroker->pen.num_vertices); - if (_cairo_slope_compare (&stroker->pen.vertices[stop].slope_cw, - in_vector) < 0) - return; - } - - npoints = stop - start; - } else { - step = -1; - - start = _cairo_pen_find_active_ccw_vertex_index (&stroker->pen, - in_vector); - if (_cairo_slope_compare (&stroker->pen.vertices[start].slope_ccw, - in_vector) < 0) - start = range_step (start, -1, stroker->pen.num_vertices); - - stop = _cairo_pen_find_active_ccw_vertex_index (&stroker->pen, - out_vector); - if (_cairo_slope_compare (&stroker->pen.vertices[stop].slope_cw, - out_vector) > 0) - { - stop = range_step (stop, 1, stroker->pen.num_vertices); - if (_cairo_slope_compare (&stroker->pen.vertices[stop].slope_ccw, - in_vector) < 0) - return; - } - - npoints = start - stop; - } - stop = range_step (stop, step, stroker->pen.num_vertices); - if (npoints < 0) - npoints += stroker->pen.num_vertices; - if (npoints <= 1) - return; - - for (i = start; - i != stop; - i = range_step (i, step, stroker->pen.num_vertices)) - { - cairo_point_t p = *midpt; - translate_point (&p, &stroker->pen.vertices[i].point); - //contour_add_point (stroker, c, &p); - } -} - -static int -join_is_clockwise (const cairo_stroke_face_t *in, - const cairo_stroke_face_t *out) -{ - return _cairo_slope_compare (&in->dev_vector, &out->dev_vector) < 0; -} - -static void -inner_join (struct stroker *stroker, - const cairo_stroke_face_t *in, - const cairo_stroke_face_t *out, - int clockwise) -{ - const cairo_point_t *outpt; - - if (clockwise) { - outpt = &out->ccw; - } else { - outpt = &out->cw; - } - //contour_add_point (stroker, inner, &in->point); - //contour_add_point (stroker, inner, outpt); -} - -static void -inner_close (struct stroker *stroker, - const cairo_stroke_face_t *in, - cairo_stroke_face_t *out) -{ - const cairo_point_t *inpt; - - if (join_is_clockwise (in, out)) { - inpt = &out->ccw; - } else { - inpt = &out->cw; - } - - //contour_add_point (stroker, inner, &in->point); - //contour_add_point (stroker, inner, inpt); - //*_cairo_contour_first_point (&inner->contour) = - //*_cairo_contour_last_point (&inner->contour); -} - -static void -outer_close (struct stroker *stroker, - const cairo_stroke_face_t *in, - const cairo_stroke_face_t *out) -{ - const cairo_point_t *inpt, *outpt; - int clockwise; - - if (in->cw.x == out->cw.x && in->cw.y == out->cw.y && - in->ccw.x == out->ccw.x && in->ccw.y == out->ccw.y) - { - return; - } - clockwise = join_is_clockwise (in, out); - if (clockwise) { - inpt = &in->cw; - outpt = &out->cw; - } else { - inpt = &in->ccw; - outpt = &out->ccw; - } - - switch (stroker->style.line_join) { - case CAIRO_LINE_JOIN_ROUND: - /* construct a fan around the common midpoint */ - add_fan (stroker, - &in->dev_vector, - &out->dev_vector, - &in->point, inpt, outpt, - clockwise); - break; - - case CAIRO_LINE_JOIN_MITER: - default: { - /* dot product of incoming slope vector with outgoing slope vector */ - double in_dot_out = -in->usr_vector.x * out->usr_vector.x + - -in->usr_vector.y * out->usr_vector.y; - double ml = stroker->style.miter_limit; - - /* Check the miter limit -- lines meeting at an acute angle - * can generate long miters, the limit converts them to bevel - * - * Consider the miter join formed when two line segments - * meet at an angle psi: - * - * /.\ - * /. .\ - * /./ \.\ - * /./psi\.\ - * - * We can zoom in on the right half of that to see: - * - * |\ - * | \ psi/2 - * | \ - * | \ - * | \ - * | \ - * miter \ - * length \ - * | \ - * | .\ - * | . \ - * |. line \ - * \ width \ - * \ \ - * - * - * The right triangle in that figure, (the line-width side is - * shown faintly with three '.' characters), gives us the - * following expression relating miter length, angle and line - * width: - * - * 1 /sin (psi/2) = miter_length / line_width - * - * The right-hand side of this relationship is the same ratio - * in which the miter limit (ml) is expressed. We want to know - * when the miter length is within the miter limit. That is - * when the following condition holds: - * - * 1/sin(psi/2) <= ml - * 1 <= ml sin(psi/2) - * 1 <= ml² sin²(psi/2) - * 2 <= ml² 2 sin²(psi/2) - * 2·sin²(psi/2) = 1-cos(psi) - * 2 <= ml² (1-cos(psi)) - * - * in · out = |in| |out| cos (psi) - * - * in and out are both unit vectors, so: - * - * in · out = cos (psi) - * - * 2 <= ml² (1 - in · out) - * - */ - if (2 <= ml * ml * (1 - in_dot_out)) { - double x1, y1, x2, y2; - double mx, my; - double dx1, dx2, dy1, dy2; - double ix, iy; - double fdx1, fdy1, fdx2, fdy2; - double mdx, mdy; - - /* - * we've got the points already transformed to device - * space, but need to do some computation with them and - * also need to transform the slope from user space to - * device space - */ - /* outer point of incoming line face */ - x1 = _cairo_fixed_to_double (inpt->x); - y1 = _cairo_fixed_to_double (inpt->y); - dx1 = in->usr_vector.x; - dy1 = in->usr_vector.y; - cairo_matrix_transform_distance (stroker->ctm, &dx1, &dy1); - - /* outer point of outgoing line face */ - x2 = _cairo_fixed_to_double (outpt->x); - y2 = _cairo_fixed_to_double (outpt->y); - dx2 = out->usr_vector.x; - dy2 = out->usr_vector.y; - cairo_matrix_transform_distance (stroker->ctm, &dx2, &dy2); - - /* - * Compute the location of the outer corner of the miter. - * That's pretty easy -- just the intersection of the two - * outer edges. We've got slopes and points on each - * of those edges. Compute my directly, then compute - * mx by using the edge with the larger dy; that avoids - * dividing by values close to zero. - */ - my = (((x2 - x1) * dy1 * dy2 - y2 * dx2 * dy1 + y1 * dx1 * dy2) / - (dx1 * dy2 - dx2 * dy1)); - if (fabs (dy1) >= fabs (dy2)) - mx = (my - y1) * dx1 / dy1 + x1; - else - mx = (my - y2) * dx2 / dy2 + x2; - - /* - * When the two outer edges are nearly parallel, slight - * perturbations in the position of the outer points of the lines - * caused by representing them in fixed point form can cause the - * intersection point of the miter to move a large amount. If - * that moves the miter intersection from between the two faces, - * then draw a bevel instead. - */ - - ix = _cairo_fixed_to_double (in->point.x); - iy = _cairo_fixed_to_double (in->point.y); - - /* slope of one face */ - fdx1 = x1 - ix; fdy1 = y1 - iy; - - /* slope of the other face */ - fdx2 = x2 - ix; fdy2 = y2 - iy; - - /* slope from the intersection to the miter point */ - mdx = mx - ix; mdy = my - iy; - - /* - * Make sure the miter point line lies between the two - * faces by comparing the slopes - */ - if (slope_compare_sgn (fdx1, fdy1, mdx, mdy) != - slope_compare_sgn (fdx2, fdy2, mdx, mdy)) - { - cairo_point_t p; - - p.x = _cairo_fixed_from_double (mx); - p.y = _cairo_fixed_from_double (my); - - //*_cairo_contour_last_point (&outer->contour) = p; - //*_cairo_contour_first_point (&outer->contour) = p; - return; - } - } - break; - } - - case CAIRO_LINE_JOIN_BEVEL: - break; - } - //contour_add_point (stroker, outer, outpt); -} - -static void -outer_join (struct stroker *stroker, - const cairo_stroke_face_t *in, - const cairo_stroke_face_t *out, - int clockwise) -{ - const cairo_point_t *inpt, *outpt; - - if (in->cw.x == out->cw.x && in->cw.y == out->cw.y && - in->ccw.x == out->ccw.x && in->ccw.y == out->ccw.y) - { - return; - } - if (clockwise) { - inpt = &in->cw; - outpt = &out->cw; - } else { - inpt = &in->ccw; - outpt = &out->ccw; - } - - switch (stroker->style.line_join) { - case CAIRO_LINE_JOIN_ROUND: - /* construct a fan around the common midpoint */ - add_fan (stroker, - &in->dev_vector, - &out->dev_vector, - &in->point, inpt, outpt, - clockwise); - break; - - case CAIRO_LINE_JOIN_MITER: - default: { - /* dot product of incoming slope vector with outgoing slope vector */ - double in_dot_out = -in->usr_vector.x * out->usr_vector.x + - -in->usr_vector.y * out->usr_vector.y; - double ml = stroker->style.miter_limit; - - /* Check the miter limit -- lines meeting at an acute angle - * can generate long miters, the limit converts them to bevel - * - * Consider the miter join formed when two line segments - * meet at an angle psi: - * - * /.\ - * /. .\ - * /./ \.\ - * /./psi\.\ - * - * We can zoom in on the right half of that to see: - * - * |\ - * | \ psi/2 - * | \ - * | \ - * | \ - * | \ - * miter \ - * length \ - * | \ - * | .\ - * | . \ - * |. line \ - * \ width \ - * \ \ - * - * - * The right triangle in that figure, (the line-width side is - * shown faintly with three '.' characters), gives us the - * following expression relating miter length, angle and line - * width: - * - * 1 /sin (psi/2) = miter_length / line_width - * - * The right-hand side of this relationship is the same ratio - * in which the miter limit (ml) is expressed. We want to know - * when the miter length is within the miter limit. That is - * when the following condition holds: - * - * 1/sin(psi/2) <= ml - * 1 <= ml sin(psi/2) - * 1 <= ml² sin²(psi/2) - * 2 <= ml² 2 sin²(psi/2) - * 2·sin²(psi/2) = 1-cos(psi) - * 2 <= ml² (1-cos(psi)) - * - * in · out = |in| |out| cos (psi) - * - * in and out are both unit vectors, so: - * - * in · out = cos (psi) - * - * 2 <= ml² (1 - in · out) - * - */ - if (2 <= ml * ml * (1 - in_dot_out)) { - double x1, y1, x2, y2; - double mx, my; - double dx1, dx2, dy1, dy2; - double ix, iy; - double fdx1, fdy1, fdx2, fdy2; - double mdx, mdy; - - /* - * we've got the points already transformed to device - * space, but need to do some computation with them and - * also need to transform the slope from user space to - * device space - */ - /* outer point of incoming line face */ - x1 = _cairo_fixed_to_double (inpt->x); - y1 = _cairo_fixed_to_double (inpt->y); - dx1 = in->usr_vector.x; - dy1 = in->usr_vector.y; - cairo_matrix_transform_distance (stroker->ctm, &dx1, &dy1); - - /* outer point of outgoing line face */ - x2 = _cairo_fixed_to_double (outpt->x); - y2 = _cairo_fixed_to_double (outpt->y); - dx2 = out->usr_vector.x; - dy2 = out->usr_vector.y; - cairo_matrix_transform_distance (stroker->ctm, &dx2, &dy2); - - /* - * Compute the location of the outer corner of the miter. - * That's pretty easy -- just the intersection of the two - * outer edges. We've got slopes and points on each - * of those edges. Compute my directly, then compute - * mx by using the edge with the larger dy; that avoids - * dividing by values close to zero. - */ - my = (((x2 - x1) * dy1 * dy2 - y2 * dx2 * dy1 + y1 * dx1 * dy2) / - (dx1 * dy2 - dx2 * dy1)); - if (fabs (dy1) >= fabs (dy2)) - mx = (my - y1) * dx1 / dy1 + x1; - else - mx = (my - y2) * dx2 / dy2 + x2; - - /* - * When the two outer edges are nearly parallel, slight - * perturbations in the position of the outer points of the lines - * caused by representing them in fixed point form can cause the - * intersection point of the miter to move a large amount. If - * that moves the miter intersection from between the two faces, - * then draw a bevel instead. - */ - - ix = _cairo_fixed_to_double (in->point.x); - iy = _cairo_fixed_to_double (in->point.y); - - /* slope of one face */ - fdx1 = x1 - ix; fdy1 = y1 - iy; - - /* slope of the other face */ - fdx2 = x2 - ix; fdy2 = y2 - iy; - - /* slope from the intersection to the miter point */ - mdx = mx - ix; mdy = my - iy; - - /* - * Make sure the miter point line lies between the two - * faces by comparing the slopes - */ - if (slope_compare_sgn (fdx1, fdy1, mdx, mdy) != - slope_compare_sgn (fdx2, fdy2, mdx, mdy)) - { - cairo_point_t p; - - p.x = _cairo_fixed_from_double (mx); - p.y = _cairo_fixed_from_double (my); - - //*_cairo_contour_last_point (&outer->contour) = p; - return; - } - } - break; - } - - case CAIRO_LINE_JOIN_BEVEL: - break; - } - //contour_add_point (stroker,outer, outpt); -} - -static void -add_cap (struct stroker *stroker, - const cairo_stroke_face_t *f) -{ - switch (stroker->style.line_cap) { - case CAIRO_LINE_CAP_ROUND: { - cairo_slope_t slope; - - slope.dx = -f->dev_vector.dx; - slope.dy = -f->dev_vector.dy; - - add_fan (stroker, &f->dev_vector, &slope, - &f->point, &f->ccw, &f->cw, - FALSE); - break; - } - - case CAIRO_LINE_CAP_SQUARE: { - double dx, dy; - cairo_slope_t fvector; - cairo_point_t quad[4]; - - dx = f->usr_vector.x; - dy = f->usr_vector.y; - dx *= stroker->style.line_width / 2.0; - dy *= stroker->style.line_width / 2.0; - cairo_matrix_transform_distance (stroker->ctm, &dx, &dy); - fvector.dx = _cairo_fixed_from_double (dx); - fvector.dy = _cairo_fixed_from_double (dy); - - quad[0] = f->ccw; - quad[1].x = f->ccw.x + fvector.dx; - quad[1].y = f->ccw.y + fvector.dy; - quad[2].x = f->cw.x + fvector.dx; - quad[2].y = f->cw.y + fvector.dy; - quad[3] = f->cw; - - //contour_add_point (stroker, c, &quad[1]); - //contour_add_point (stroker, c, &quad[2]); - } - - case CAIRO_LINE_CAP_BUTT: - default: - break; - } - //contour_add_point (stroker, c, &f->cw); -} - -static void -add_leading_cap (struct stroker *stroker, - const cairo_stroke_face_t *face) -{ - cairo_stroke_face_t reversed; - cairo_point_t t; - - reversed = *face; - - /* The initial cap needs an outward facing vector. Reverse everything */ - reversed.usr_vector.x = -reversed.usr_vector.x; - reversed.usr_vector.y = -reversed.usr_vector.y; - reversed.dev_vector.dx = -reversed.dev_vector.dx; - reversed.dev_vector.dy = -reversed.dev_vector.dy; - - t = reversed.cw; - reversed.cw = reversed.ccw; - reversed.ccw = t; - - add_cap (stroker, &reversed); -} - -static void -add_trailing_cap (struct stroker *stroker, - const cairo_stroke_face_t *face) -{ - add_cap (stroker, face); -} - -static inline double -normalize_slope (double *dx, double *dy) -{ - double dx0 = *dx, dy0 = *dy; - double mag; - - assert (dx0 != 0.0 || dy0 != 0.0); - - if (dx0 == 0.0) { - *dx = 0.0; - if (dy0 > 0.0) { - mag = dy0; - *dy = 1.0; - } else { - mag = -dy0; - *dy = -1.0; - } - } else if (dy0 == 0.0) { - *dy = 0.0; - if (dx0 > 0.0) { - mag = dx0; - *dx = 1.0; - } else { - mag = -dx0; - *dx = -1.0; - } - } else { - mag = hypot (dx0, dy0); - *dx = dx0 / mag; - *dy = dy0 / mag; - } - - return mag; -} - -static void -compute_face (const cairo_point_t *point, - const cairo_slope_t *dev_slope, - struct stroker *stroker, - cairo_stroke_face_t *face) -{ - double face_dx, face_dy; - cairo_point_t offset_ccw, offset_cw; - double slope_dx, slope_dy; - - slope_dx = _cairo_fixed_to_double (dev_slope->dx); - slope_dy = _cairo_fixed_to_double (dev_slope->dy); - face->length = normalize_slope (&slope_dx, &slope_dy); - face->dev_slope.x = slope_dx; - face->dev_slope.y = slope_dy; - - /* - * rotate to get a line_width/2 vector along the face, note that - * the vector must be rotated the right direction in device space, - * but by 90° in user space. So, the rotation depends on - * whether the ctm reflects or not, and that can be determined - * by looking at the determinant of the matrix. - */ - if (! _cairo_matrix_is_identity (stroker->ctm_inverse)) { - /* Normalize the matrix! */ - cairo_matrix_transform_distance (stroker->ctm_inverse, - &slope_dx, &slope_dy); - normalize_slope (&slope_dx, &slope_dy); - - if (stroker->ctm_det_positive) { - face_dx = - slope_dy * (stroker->style.line_width / 2.0); - face_dy = slope_dx * (stroker->style.line_width / 2.0); - } else { - face_dx = slope_dy * (stroker->style.line_width / 2.0); - face_dy = - slope_dx * (stroker->style.line_width / 2.0); - } - - /* back to device space */ - cairo_matrix_transform_distance (stroker->ctm, &face_dx, &face_dy); - } else { - face_dx = - slope_dy * (stroker->style.line_width / 2.0); - face_dy = slope_dx * (stroker->style.line_width / 2.0); - } - - offset_ccw.x = _cairo_fixed_from_double (face_dx); - offset_ccw.y = _cairo_fixed_from_double (face_dy); - offset_cw.x = -offset_ccw.x; - offset_cw.y = -offset_ccw.y; - - face->ccw = *point; - translate_point (&face->ccw, &offset_ccw); - - face->point = *point; - - face->cw = *point; - translate_point (&face->cw, &offset_cw); - - face->usr_vector.x = slope_dx; - face->usr_vector.y = slope_dy; - - face->dev_vector = *dev_slope; -} - -static void -add_caps (struct stroker *stroker) -{ - /* check for a degenerative sub_path */ - if (stroker->has_sub_path && - ! stroker->has_first_face && - ! stroker->has_current_face && - stroker->style.line_cap == CAIRO_LINE_CAP_ROUND) - { - /* pick an arbitrary slope to use */ - cairo_slope_t slope = { CAIRO_FIXED_ONE, 0 }; - cairo_stroke_face_t face; - - /* arbitrarily choose first_point */ - compute_face (&stroker->first_point, &slope, stroker, &face); - - add_leading_cap (stroker, &face); - add_trailing_cap (stroker, &face); - - /* ensure the circle is complete */ - //_cairo_contour_add_point (&stroker->ccw.contour, - //_cairo_contour_first_point (&stroker->ccw.contour)); - } else { - if (stroker->has_current_face) - add_trailing_cap (stroker, &stroker->current_face); - - //_cairo_polygon_add_contour (stroker->polygon, &stroker->ccw.contour); - //_cairo_contour_reset (&stroker->ccw.contour); - - if (stroker->has_first_face) { - //_cairo_contour_add_point (&stroker->ccw.contour, - //&stroker->first_face.cw); - add_leading_cap (stroker, &stroker->first_face); - //_cairo_polygon_add_contour (stroker->polygon, - //&stroker->ccw.contour); - //_cairo_contour_reset (&stroker->ccw.contour); - } - } -} - -static cairo_status_t -move_to (void *closure, - const cairo_point_t *point) -{ - struct stroker *stroker = closure; - - /* Cap the start and end of the previous sub path as needed */ - add_caps (stroker); - - stroker->has_first_face = FALSE; - stroker->has_current_face = FALSE; - stroker->has_sub_path = FALSE; - - stroker->first_point = *point; - - stroker->current_face.point = *point; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -line_to (void *closure, - const cairo_point_t *point) -{ - struct stroker *stroker = closure; - cairo_stroke_face_t start; - cairo_point_t *p1 = &stroker->current_face.point; - cairo_slope_t dev_slope; - - stroker->has_sub_path = TRUE; - - if (p1->x == point->x && p1->y == point->y) - return CAIRO_STATUS_SUCCESS; - - _cairo_slope_init (&dev_slope, p1, point); - compute_face (p1, &dev_slope, stroker, &start); - - if (stroker->has_current_face) { - int clockwise = join_is_clockwise (&stroker->current_face, &start); - /* Join with final face from previous segment */ - outer_join (stroker, &stroker->current_face, &start, clockwise); - inner_join (stroker, &stroker->current_face, &start, clockwise); - } else { - if (! stroker->has_first_face) { - /* Save sub path's first face in case needed for closing join */ - stroker->first_face = start; - _cairo_tristrip_move_to (stroker->strip, &start.cw); - stroker->has_first_face = TRUE; - } - stroker->has_current_face = TRUE; - - _cairo_tristrip_add_point (stroker->strip, &start.cw); - _cairo_tristrip_add_point (stroker->strip, &start.ccw); - } - - stroker->current_face = start; - stroker->current_face.point = *point; - stroker->current_face.ccw.x += dev_slope.dx; - stroker->current_face.ccw.y += dev_slope.dy; - stroker->current_face.cw.x += dev_slope.dx; - stroker->current_face.cw.y += dev_slope.dy; - - _cairo_tristrip_add_point (stroker->strip, &stroker->current_face.cw); - _cairo_tristrip_add_point (stroker->strip, &stroker->current_face.ccw); - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -spline_to (void *closure, - const cairo_point_t *point, - const cairo_slope_t *tangent) -{ - struct stroker *stroker = closure; - cairo_stroke_face_t face; - - if (tangent->dx == 0 && tangent->dy == 0) { - const cairo_point_t *inpt, *outpt; - cairo_point_t t; - int clockwise; - - face = stroker->current_face; - - face.usr_vector.x = -face.usr_vector.x; - face.usr_vector.y = -face.usr_vector.y; - face.dev_vector.dx = -face.dev_vector.dx; - face.dev_vector.dy = -face.dev_vector.dy; - - t = face.cw; - face.cw = face.ccw; - face.ccw = t; - - clockwise = join_is_clockwise (&stroker->current_face, &face); - if (clockwise) { - inpt = &stroker->current_face.cw; - outpt = &face.cw; - } else { - inpt = &stroker->current_face.ccw; - outpt = &face.ccw; - } - - add_fan (stroker, - &stroker->current_face.dev_vector, - &face.dev_vector, - &stroker->current_face.point, inpt, outpt, - clockwise); - } else { - compute_face (point, tangent, stroker, &face); - - if (face.dev_slope.x * stroker->current_face.dev_slope.x + - face.dev_slope.y * stroker->current_face.dev_slope.y < 0) - { - const cairo_point_t *inpt, *outpt; - int clockwise = join_is_clockwise (&stroker->current_face, &face); - - stroker->current_face.cw.x += face.point.x - stroker->current_face.point.x; - stroker->current_face.cw.y += face.point.y - stroker->current_face.point.y; - //contour_add_point (stroker, &stroker->cw, &stroker->current_face.cw); - - stroker->current_face.ccw.x += face.point.x - stroker->current_face.point.x; - stroker->current_face.ccw.y += face.point.y - stroker->current_face.point.y; - //contour_add_point (stroker, &stroker->ccw, &stroker->current_face.ccw); - - if (clockwise) { - inpt = &stroker->current_face.cw; - outpt = &face.cw; - } else { - inpt = &stroker->current_face.ccw; - outpt = &face.ccw; - } - add_fan (stroker, - &stroker->current_face.dev_vector, - &face.dev_vector, - &stroker->current_face.point, inpt, outpt, - clockwise); - } - - _cairo_tristrip_add_point (stroker->strip, &face.cw); - _cairo_tristrip_add_point (stroker->strip, &face.ccw); - } - - stroker->current_face = face; - - return CAIRO_STATUS_SUCCESS; -} - -static cairo_status_t -curve_to (void *closure, - const cairo_point_t *b, - const cairo_point_t *c, - const cairo_point_t *d) -{ - struct stroker *stroker = closure; - cairo_spline_t spline; - cairo_stroke_face_t face; - - if (stroker->has_limits) { - if (! _cairo_spline_intersects (&stroker->current_face.point, b, c, d, - &stroker->limit)) - return line_to (closure, d); - } - - if (! _cairo_spline_init (&spline, spline_to, stroker, - &stroker->current_face.point, b, c, d)) - return line_to (closure, d); - - compute_face (&stroker->current_face.point, &spline.initial_slope, - stroker, &face); - - if (stroker->has_current_face) { - int clockwise = join_is_clockwise (&stroker->current_face, &face); - /* Join with final face from previous segment */ - outer_join (stroker, &stroker->current_face, &face, clockwise); - inner_join (stroker, &stroker->current_face, &face, clockwise); - } else { - if (! stroker->has_first_face) { - /* Save sub path's first face in case needed for closing join */ - stroker->first_face = face; - _cairo_tristrip_move_to (stroker->strip, &face.cw); - stroker->has_first_face = TRUE; - } - stroker->has_current_face = TRUE; - - _cairo_tristrip_add_point (stroker->strip, &face.cw); - _cairo_tristrip_add_point (stroker->strip, &face.ccw); - } - stroker->current_face = face; - - return _cairo_spline_decompose (&spline, stroker->tolerance); -} - -static cairo_status_t -close_path (void *closure) -{ - struct stroker *stroker = closure; - cairo_status_t status; - - status = line_to (stroker, &stroker->first_point); - if (unlikely (status)) - return status; - - if (stroker->has_first_face && stroker->has_current_face) { - /* Join first and final faces of sub path */ - outer_close (stroker, &stroker->current_face, &stroker->first_face); - inner_close (stroker, &stroker->current_face, &stroker->first_face); - } else { - /* Cap the start and end of the sub path as needed */ - add_caps (stroker); - } - - stroker->has_sub_path = FALSE; - stroker->has_first_face = FALSE; - stroker->has_current_face = FALSE; - - return CAIRO_STATUS_SUCCESS; -} - -cairo_int_status_t -_cairo_path_fixed_stroke_to_tristrip (const cairo_path_fixed_t *path, - const cairo_stroke_style_t*style, - const cairo_matrix_t *ctm, - const cairo_matrix_t *ctm_inverse, - double tolerance, - cairo_tristrip_t *strip) -{ - struct stroker stroker; - cairo_int_status_t status; - int i; - - if (style->num_dashes) - return CAIRO_INT_STATUS_UNSUPPORTED; - - stroker.style = *style; - stroker.ctm = ctm; - stroker.ctm_inverse = ctm_inverse; - stroker.tolerance = tolerance; - - stroker.ctm_det_positive = - _cairo_matrix_compute_determinant (ctm) >= 0.0; - - status = _cairo_pen_init (&stroker.pen, - style->line_width / 2.0, - tolerance, ctm); - if (unlikely (status)) - return status; - - if (stroker.pen.num_vertices <= 1) - return CAIRO_INT_STATUS_NOTHING_TO_DO; - - stroker.has_current_face = FALSE; - stroker.has_first_face = FALSE; - stroker.has_sub_path = FALSE; - - stroker.has_limits = strip->num_limits > 0; - stroker.limit = strip->limits[0]; - for (i = 1; i < strip->num_limits; i++) - _cairo_box_add_box (&stroker.limit, &strip->limits[i]); - - stroker.strip = strip; - - status = _cairo_path_fixed_interpret (path, - move_to, - line_to, - curve_to, - close_path, - &stroker); - /* Cap the start and end of the final sub path as needed */ - if (likely (status == CAIRO_INT_STATUS_SUCCESS)) - add_caps (&stroker); - - _cairo_pen_fini (&stroker.pen); - - return status; -} |