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1 /*
2  * Copyright © 2011  Google, Inc.
3  *
4  *  This is part of HarfBuzz, a text shaping library.
5  *
6  * Permission is hereby granted, without written agreement and without
7  * license or royalty fees, to use, copy, modify, and distribute this
8  * software and its documentation for any purpose, provided that the
9  * above copyright notice and the following two paragraphs appear in
10  * all copies of this software.
11  *
12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16  * DAMAGE.
17  *
18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23  *
24  * Google Author(s): Behdad Esfahbod
25  */
26 
27 #include "hb-test.h"
28 
29 /* Unit tests for hb-shape.h */
30 
31 /*
32  * This test provides a framework to test aspects of hb_shape() that are
33  * font-independent.  Please add tests for any feature that fits that
34  * description.
35  */
36 
37 /* TODO Make this test data-driven and add some real test data */
38 /* TODO Test positions too. And test non-native direction.  Test commit 2e18c6dbdfb */
39 
40 
41 static const char test_data[] = "test\0data";
42 
43 static hb_position_t
glyph_h_advance_func(hb_font_t * font,void * font_data,hb_codepoint_t glyph,void * user_data)44 glyph_h_advance_func (hb_font_t *font, void *font_data,
45 		      hb_codepoint_t glyph,
46 		      void *user_data)
47 {
48   switch (glyph) {
49   case 1: return 10;
50   case 2: return 6;
51   case 3: return 5;
52   }
53   return 0;
54 }
55 
56 static hb_bool_t
glyph_func(hb_font_t * font,void * font_data,hb_codepoint_t unicode,hb_codepoint_t variant_selector,hb_codepoint_t * glyph,void * user_data)57 glyph_func (hb_font_t *font, void *font_data,
58 	    hb_codepoint_t unicode, hb_codepoint_t variant_selector,
59 	    hb_codepoint_t *glyph,
60 	    void *user_data)
61 {
62   switch (unicode) {
63   case 'T': *glyph = 1; return TRUE;
64   case 'e': *glyph = 2; return TRUE;
65   case 's': *glyph = 3; return TRUE;
66   }
67   return FALSE;
68 }
69 
70 static hb_position_t
glyph_h_kerning_func(hb_font_t * font,void * font_data,hb_codepoint_t left,hb_codepoint_t right,void * user_data)71 glyph_h_kerning_func (hb_font_t *font, void *font_data,
72 		      hb_codepoint_t left, hb_codepoint_t right,
73 		      void *user_data)
74 {
75   if (left == 1 && right == 2)
76     return -2;
77 
78   return 0;
79 }
80 
81 static const char TesT[] = "TesT";
82 
83 static void
test_shape(void)84 test_shape (void)
85 {
86   hb_blob_t *blob;
87   hb_face_t *face;
88   hb_font_funcs_t *ffuncs;
89   hb_font_t *font;
90   hb_buffer_t *buffer;
91   unsigned int len;
92   hb_glyph_info_t *glyphs;
93   hb_glyph_position_t *positions;
94 
95   blob = hb_blob_create (test_data, sizeof (test_data), HB_MEMORY_MODE_READONLY, NULL, NULL);
96   face = hb_face_create (blob, 0);
97   hb_blob_destroy (blob);
98   font = hb_font_create (face);
99   hb_face_destroy (face);
100   hb_font_set_scale (font, 10, 10);
101 
102   ffuncs = hb_font_funcs_create ();
103   hb_font_funcs_set_glyph_h_advance_func (ffuncs, glyph_h_advance_func, NULL, NULL);
104   hb_font_funcs_set_glyph_func (ffuncs, glyph_func, NULL, NULL);
105   hb_font_funcs_set_glyph_h_kerning_func (ffuncs, glyph_h_kerning_func, NULL, NULL);
106   hb_font_set_funcs (font, ffuncs, NULL, NULL);
107   hb_font_funcs_destroy (ffuncs);
108 
109   buffer =  hb_buffer_create ();
110   hb_buffer_set_direction (buffer, HB_DIRECTION_LTR);
111   hb_buffer_add_utf8 (buffer, TesT, 4, 0, 4);
112 
113   hb_shape (font, buffer, NULL, 0);
114 
115   len = hb_buffer_get_length (buffer);
116   glyphs = hb_buffer_get_glyph_infos (buffer, NULL);
117   positions = hb_buffer_get_glyph_positions (buffer, NULL);
118 
119   {
120     const hb_codepoint_t output_glyphs[] = {1, 2, 3, 1};
121     const hb_position_t output_x_advances[] = {9, 5, 5, 10};
122     const hb_position_t output_x_offsets[] = {0, -1, 0, 0};
123     unsigned int i;
124     g_assert_cmpint (len, ==, 4);
125     for (i = 0; i < len; i++) {
126       g_assert_cmphex (glyphs[i].codepoint, ==, output_glyphs[i]);
127       g_assert_cmphex (glyphs[i].cluster,   ==, i);
128     }
129     for (i = 0; i < len; i++) {
130       g_assert_cmpint (output_x_advances[i], ==, positions[i].x_advance);
131       g_assert_cmpint (output_x_offsets [i], ==, positions[i].x_offset);
132       g_assert_cmpint (0, ==, positions[i].y_advance);
133       g_assert_cmpint (0, ==, positions[i].y_offset);
134     }
135   }
136 
137   hb_buffer_destroy (buffer);
138   hb_font_destroy (font);
139 }
140 
141 static void
test_shape_list(void)142 test_shape_list (void)
143 {
144   const char **shapers = hb_shape_list_shapers ();
145 
146   unsigned int i;
147   for (i = 0; shapers[i]; i++)
148     ;
149 
150   g_assert_cmpint (i, >, 1);
151   g_assert (!strcmp (shapers[i - 1], "fallback"));
152 }
153 
154 int
main(int argc,char ** argv)155 main (int argc, char **argv)
156 {
157   hb_test_init (&argc, &argv);
158 
159   hb_test_add (test_shape);
160   /* TODO test fallback shaper */
161   /* TODO test shaper_full */
162   hb_test_add (test_shape_list);
163 
164   return hb_test_run();
165 }
166