Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/OT/glyf/path-builder.hh @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #ifndef OT_GLYF_PATH_BUILDER_HH
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2 #define OT_GLYF_PATH_BUILDER_HH
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3
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5 #include "../../hb.hh"
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6
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7
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8 namespace OT {
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9 namespace glyf_impl {
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10
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11
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12 struct path_builder_t
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13 {
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14 hb_font_t *font;
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15 hb_draw_session_t *draw_session;
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16
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17 struct optional_point_t
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18 {
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19 optional_point_t () {}
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20 optional_point_t (float x_, float y_) : has_data (true), x (x_), y (y_) {}
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21 operator bool () const { return has_data; }
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22
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23 bool has_data = false;
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24 float x = 0.;
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25 float y = 0.;
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27 optional_point_t lerp (optional_point_t p, float t)
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28 { return optional_point_t (x + t * (p.x - x), y + t * (p.y - y)); }
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29 } first_oncurve, first_offcurve, last_offcurve;
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30
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31 path_builder_t (hb_font_t *font_, hb_draw_session_t &draw_session_)
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32 {
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33 font = font_;
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34 draw_session = &draw_session_;
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35 first_oncurve = first_offcurve = last_offcurve = optional_point_t ();
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36 }
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37
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38 /* based on https://github.com/RazrFalcon/ttf-parser/blob/4f32821/src/glyf.rs#L287
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39 See also:
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40 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM01/Chap1.html
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41 * https://stackoverflow.com/a/20772557 */
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42 void consume_point (const contour_point_t &point)
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43 {
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44 bool is_on_curve = point.flag & glyf_impl::SimpleGlyph::FLAG_ON_CURVE;
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45 optional_point_t p (font->em_fscalef_x (point.x), font->em_fscalef_y (point.y));
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46 if (!first_oncurve)
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47 {
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48 if (is_on_curve)
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49 {
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50 first_oncurve = p;
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51 draw_session->move_to (p.x, p.y);
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52 }
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53 else
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54 {
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55 if (first_offcurve)
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56 {
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57 optional_point_t mid = first_offcurve.lerp (p, .5f);
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58 first_oncurve = mid;
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59 last_offcurve = p;
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60 draw_session->move_to (mid.x, mid.y);
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61 }
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62 else
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63 first_offcurve = p;
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64 }
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65 }
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66 else
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67 {
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68 if (last_offcurve)
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69 {
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70 if (is_on_curve)
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71 {
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72 draw_session->quadratic_to (last_offcurve.x, last_offcurve.y,
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73 p.x, p.y);
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74 last_offcurve = optional_point_t ();
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75 }
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76 else
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77 {
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78 optional_point_t mid = last_offcurve.lerp (p, .5f);
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79 draw_session->quadratic_to (last_offcurve.x, last_offcurve.y,
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80 mid.x, mid.y);
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81 last_offcurve = p;
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82 }
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83 }
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84 else
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85 {
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86 if (is_on_curve)
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87 draw_session->line_to (p.x, p.y);
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88 else
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89 last_offcurve = p;
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90 }
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91 }
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92
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93 if (point.is_end_point)
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94 {
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95 if (first_offcurve && last_offcurve)
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96 {
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97 optional_point_t mid = last_offcurve.lerp (first_offcurve, .5f);
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98 draw_session->quadratic_to (last_offcurve.x, last_offcurve.y,
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99 mid.x, mid.y);
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100 last_offcurve = optional_point_t ();
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101 /* now check the rest */
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102 }
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103
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104 if (first_offcurve && first_oncurve)
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105 draw_session->quadratic_to (first_offcurve.x, first_offcurve.y,
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106 first_oncurve.x, first_oncurve.y);
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107 else if (last_offcurve && first_oncurve)
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108 draw_session->quadratic_to (last_offcurve.x, last_offcurve.y,
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109 first_oncurve.x, first_oncurve.y);
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110 else if (first_oncurve)
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111 draw_session->line_to (first_oncurve.x, first_oncurve.y);
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112 else if (first_offcurve)
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113 {
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114 float x = first_offcurve.x, y = first_offcurve.y;
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115 draw_session->move_to (x, y);
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116 draw_session->quadratic_to (x, y, x, y);
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117 }
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118
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119 /* Getting ready for the next contour */
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120 first_oncurve = first_offcurve = last_offcurve = optional_point_t ();
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121 draw_session->close_path ();
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122 }
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123 }
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124 void points_end () {}
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125
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126 bool is_consuming_contour_points () { return true; }
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127 contour_point_t *get_phantoms_sink () { return nullptr; }
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128 };
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129
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130
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131 } /* namespace glyf_impl */
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132 } /* namespace OT */
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133
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134
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135 #endif /* OT_GLYF_PATH_BUILDER_HH */