2 * Copyright © 2006 Red Hat, Inc.
4 * Permission to use, copy, modify, distribute, and sell this software
5 * and its documentation for any purpose is hereby granted without
6 * fee, provided that the above copyright notice appear in all copies
7 * and that both that copyright notice and this permission notice
8 * appear in supporting documentation, and that the name of
9 * Red Hat, Inc. not be used in advertising or publicity pertaining to
10 * distribution of the software without specific, written prior
11 * permission. Red Hat, Inc. makes no representations about the
12 * suitability of this software for any purpose. It is provided "as
13 * is" without express or implied warranty.
15 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
16 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
17 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
18 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
19 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
20 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
21 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * Author: Behdad Esfahbod <behdad@behdad.org>
30 * _cairo_atsui_font_text_to_glyph with a zero-sized string crashes.
32 * Moreover, the fallback path in cairo_scaled_font_text_to_glyphs()
33 * when handling a zero-sized string, allocates a zero-sized glyph array
34 * and when NULL is returned by malloc, recognizes that as an out-of-memory
35 * error. The glibc implementation of malloc() does not return NULL from
36 * malloc(0), but I don't think it's a safe assumption.
38 * By just bailing out on zero-sized text, we fix both issues.
41 #include "cairo-test.h"
47 text_extents_equal (const cairo_text_extents_t *A,
48 const cairo_text_extents_t *B)
50 return A->x_bearing == B->x_bearing &&
51 A->y_bearing == B->y_bearing &&
52 A->width == B->width &&
53 A->height == B->height &&
54 A->x_advance == B->x_advance &&
55 A->y_advance == B->y_advance;
59 font_extents_equal (const cairo_font_extents_t *A,
60 const cairo_font_extents_t *B)
62 return A->ascent == B->ascent &&
63 A->descent == B->descent &&
64 A->height == B->height &&
65 A->max_x_advance == B->max_x_advance &&
66 A->max_y_advance == B->max_y_advance;
69 static cairo_test_status_t
70 draw (cairo_t *cr, int width, int height)
72 const cairo_test_context_t *ctx = cairo_test_get_context (cr);
73 cairo_text_extents_t extents, nil_extents;
74 cairo_font_extents_t font_extents, nil_font_extents;
75 cairo_scaled_font_t *scaled_font;
77 cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
78 CAIRO_FONT_SLANT_NORMAL,
79 CAIRO_FONT_WEIGHT_NORMAL);
80 cairo_set_font_size (cr, 16);
82 cairo_move_to (cr, 10, 25);
83 cairo_show_text (cr, NULL);
84 cairo_show_text (cr, "");
85 cairo_show_glyphs (cr, NULL, 0);
86 cairo_show_glyphs (cr, (void*)8, 0);
88 cairo_move_to (cr, 10, 55);
89 cairo_text_path (cr, NULL);
90 cairo_text_path (cr, "");
91 cairo_glyph_path (cr, (void*)8, 0);
94 memset (&nil_extents, 0, sizeof (cairo_text_extents_t));
96 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
97 cairo_text_extents (cr, "", &extents);
98 if (! text_extents_equal (&extents, &nil_extents)) {
99 cairo_test_log (ctx, "Error: cairo_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",
100 extents.x_bearing, extents.y_bearing,
101 extents.width, extents.height,
102 extents.x_advance, extents.y_advance);
103 return CAIRO_TEST_FAILURE;
106 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
107 cairo_text_extents (cr, NULL, &extents);
108 if (! text_extents_equal (&extents, &nil_extents)) {
109 cairo_test_log (ctx, "Error: cairo_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
110 extents.x_bearing, extents.y_bearing,
111 extents.width, extents.height,
112 extents.x_advance, extents.y_advance);
113 return CAIRO_TEST_FAILURE;
116 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
117 cairo_glyph_extents (cr, (void*)8, 0, &extents);
118 if (! text_extents_equal (&extents, &nil_extents)) {
119 cairo_test_log (ctx, "Error: cairo_glyph_extents(); extents (%g, %g, %g, %g, %g, %g)\n",
120 extents.x_bearing, extents.y_bearing,
121 extents.width, extents.height,
122 extents.x_advance, extents.y_advance);
123 return CAIRO_TEST_FAILURE;
126 scaled_font = cairo_get_scaled_font (cr);
128 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
129 cairo_scaled_font_text_extents (scaled_font, "", &extents);
130 if (! text_extents_equal (&extents, &nil_extents)) {
131 cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",
132 extents.x_bearing, extents.y_bearing,
133 extents.width, extents.height,
134 extents.x_advance, extents.y_advance);
135 return CAIRO_TEST_FAILURE;
138 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
139 cairo_scaled_font_text_extents (scaled_font, NULL, &extents);
140 if (! text_extents_equal (&extents, &nil_extents)) {
141 cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
142 extents.x_bearing, extents.y_bearing,
143 extents.width, extents.height,
144 extents.x_advance, extents.y_advance);
145 return CAIRO_TEST_FAILURE;
148 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
149 cairo_scaled_font_glyph_extents (scaled_font, (void*)8, 0, &extents);
150 if (! text_extents_equal (&extents, &nil_extents)) {
151 cairo_test_log (ctx, "Error: cairo_scaled_font_glyph_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
152 extents.x_bearing, extents.y_bearing,
153 extents.width, extents.height,
154 extents.x_advance, extents.y_advance);
155 return CAIRO_TEST_FAILURE;
158 /* Lets also try font size 0 while here */
159 cairo_set_font_size (cr, 0);
161 memset (&extents, 0xff, sizeof (cairo_text_extents_t));
162 cairo_text_extents (cr, "test", &extents);
163 if (! text_extents_equal (&extents, &nil_extents)) {
164 cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_text_extents(\"test\"); extents (%g, %g, %g, %g, %g, %g)\n",
165 extents.x_bearing, extents.y_bearing,
166 extents.width, extents.height,
167 extents.x_advance, extents.y_advance);
168 return CAIRO_TEST_FAILURE;
171 memset (&nil_font_extents, 0, sizeof (cairo_font_extents_t));
173 memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));
174 cairo_font_extents (cr, &font_extents);
175 if (! font_extents_equal (&font_extents, &nil_font_extents)) {
176 cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_font_extents(); extents (%g, %g, %g, %g, %g)\n",
177 font_extents.ascent, font_extents.descent,
179 font_extents.max_x_advance, font_extents.max_y_advance);
180 return CAIRO_TEST_FAILURE;
183 scaled_font = cairo_get_scaled_font (cr);
185 memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));
186 cairo_scaled_font_extents (scaled_font, &font_extents);
187 if (! font_extents_equal (&font_extents, &nil_font_extents)) {
188 cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_scaled_font_extents(); extents (%g, %g, %g, %g, %g)\n",
189 font_extents.ascent, font_extents.descent,
191 font_extents.max_x_advance, font_extents.max_y_advance);
192 return CAIRO_TEST_FAILURE;
195 return CAIRO_TEST_SUCCESS;
198 CAIRO_TEST (text_zero_len,
199 "Tests show_text and text_path with a zero-sized string",
200 "text, stress, extents", /* keywords */
201 NULL, /* requirements */