1 /*
2 * Copyright © 2006 Red Hat, Inc.
3 *
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.
14 *
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.
22 *
23 * Author: Carl D. Worth <cworth@cworth.org>
24 */
25
26 #include "cairo-test.h"
27
28 #define TEXT_SIZE 12
29 #define PAD 4
30 #define TEXT "text"
31
32 static cairo_bool_t
text_extents_equal(const cairo_text_extents_t * A,const cairo_text_extents_t * B)33 text_extents_equal (const cairo_text_extents_t *A,
34 const cairo_text_extents_t *B)
35 {
36 return A->x_bearing == B->x_bearing &&
37 A->y_bearing == B->y_bearing &&
38 A->width == B->width &&
39 A->height == B->height &&
40 A->x_advance == B->x_advance &&
41 A->y_advance == B->y_advance;
42 }
43
44 static cairo_test_status_t
box_text(const cairo_test_context_t * ctx,cairo_t * cr,const char * utf8,double x,double y)45 box_text (const cairo_test_context_t *ctx, cairo_t *cr,
46 const char *utf8,
47 double x, double y)
48 {
49 double line_width;
50 cairo_text_extents_t extents = {0}, scaled_extents = {0};
51 cairo_scaled_font_t *scaled_font;
52 cairo_status_t status;
53
54 cairo_save (cr);
55
56 cairo_text_extents (cr, utf8, &extents);
57
58 scaled_font = cairo_get_scaled_font (cr);
59 cairo_scaled_font_text_extents (scaled_font, TEXT, &scaled_extents);
60 status = cairo_scaled_font_status (scaled_font);
61 if (status)
62 return cairo_test_status_from_status (ctx, status);
63
64 if (! text_extents_equal (&extents, &scaled_extents)) {
65 cairo_test_log (ctx,
66 "Error: extents differ when they shouldn't:\n"
67 "cairo_text_extents(); extents (%g, %g, %g, %g, %g, %g)\n"
68 "cairo_scaled_font_text_extents(); extents (%g, %g, %g, %g, %g, %g)\n",
69 extents.x_bearing, extents.y_bearing,
70 extents.width, extents.height,
71 extents.x_advance, extents.y_advance,
72 scaled_extents.x_bearing, scaled_extents.y_bearing,
73 scaled_extents.width, scaled_extents.height,
74 scaled_extents.x_advance, scaled_extents.y_advance);
75 return CAIRO_TEST_FAILURE;
76 }
77
78 line_width = cairo_get_line_width (cr);
79 cairo_rectangle (cr,
80 x + extents.x_bearing - line_width / 2,
81 y + extents.y_bearing - line_width / 2,
82 extents.width + line_width,
83 extents.height + line_width);
84 cairo_stroke (cr);
85
86 cairo_move_to (cr, x, y);
87 cairo_show_text (cr, utf8);
88
89 cairo_restore (cr);
90
91 return CAIRO_TEST_SUCCESS;
92 }
93
94 static cairo_test_status_t
draw(cairo_t * cr,int width,int height)95 draw (cairo_t *cr, int width, int height)
96 {
97 const cairo_test_context_t *ctx = cairo_test_get_context (cr);
98 cairo_test_status_t status;
99 cairo_text_extents_t extents;
100 cairo_matrix_t matrix;
101
102 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
103 cairo_paint (cr);
104
105 cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
106 CAIRO_FONT_SLANT_NORMAL,
107 CAIRO_FONT_WEIGHT_NORMAL);
108 cairo_set_font_size (cr, TEXT_SIZE);
109
110 cairo_translate (cr, PAD, PAD);
111 cairo_set_line_width (cr, 1.0);
112
113 cairo_text_extents (cr, TEXT, &extents);
114
115 /* Draw text and bounding box */
116 cairo_set_source_rgb (cr, 0, 0, 0); /* black */
117 status = box_text (ctx, cr, TEXT, 0, - extents.y_bearing);
118 if (status)
119 return status;
120
121 /* Then draw again with the same coordinates, but with a font
122 * matrix to position the text below and shifted a bit to the
123 * right. */
124 cairo_matrix_init_translate (&matrix, TEXT_SIZE / 2, TEXT_SIZE + PAD);
125 cairo_matrix_scale (&matrix, TEXT_SIZE, TEXT_SIZE);
126 cairo_set_font_matrix (cr, &matrix);
127
128 cairo_set_source_rgb (cr, 0, 0, 1); /* blue */
129 status = box_text (ctx, cr, TEXT, 0, - extents.y_bearing);
130 if (status)
131 return status;
132
133 return CAIRO_TEST_SUCCESS;
134 }
135
136 CAIRO_TEST (font_matrix_translation,
137 "Test that translation in a font matrix can be used to offset a string",
138 "font", /* keywords */
139 NULL, /* requirements */
140 38, 34,
141 NULL, draw)
142