1Imager::Test(3) User Contributed Perl Documentation Imager::Test(3)
2
6 Imager::Test - common functions used in testing Imager
7
9 use Imager::Test 'diff_text_with_nul';
10 diff_text_with_nul($test_name, $text1, $text2, @string_options);
11
13 This is a repository of functions used in testing Imager.
14 Some functions will only be useful in testing Imager itself, while
16 others should be useful in testing modules that use Imager.
17 No functions are exported by default.
19
21 Test functions
22 is_color1($color, $grey, $comment)
23 Tests if the first channel of $color matches $grey.
24 is_color3($color, $red, $green, $blue, $comment)
26 Tests if $color matches the given ($red, $green, $blue)
27 is_color4($color, $red, $green, $blue, $alpha, $comment)
29 Tests if $color matches the given ($red, $green, $blue, $alpha)
30 is_fcolor1($fcolor, $grey, $comment)
32 is_fcolor1($fcolor, $grey, $epsilon, $comment)
33 Tests if $fcolor's first channel is within $epsilon of ($grey).
34 For the first form $epsilon is taken as 0.001.
35 is_fcolor3($fcolor, $red, $green, $blue, $comment)
37 is_fcolor3($fcolor, $red, $green, $blue, $epsilon, $comment)
38 Tests if $fcolor's channels are within $epsilon of ($red, $green,
39 $blue). For the first form $epsilon is taken as 0.001.
40 is_fcolor4($fcolor, $red, $green, $blue, $alpha, $comment)
42 is_fcolor4($fcolor, $red, $green, $blue, $alpha, $epsilon, $comment)
43 Tests if $fcolor's channels are within $epsilon of ($red, $green,
44 $blue, $alpha). For the first form $epsilon is taken as 0.001.
45 is_image($im1, $im2, $comment)
47 Tests if the 2 images have the same content. Both images must be
48 defined, have the same width, height, channels and the same color
49 in each pixel. The color comparison is done at 8-bits per pixel.
50 The color representation such as direct vs paletted, bits per
51 sample are not checked. Equivalent to is_image_similar($im1, $im2,
52 0, $comment).
53 is_imaged($im, $im2, $comment)
55 is_imaged($im, $im2, $epsilon, $comment)
56 Tests if the two images have the same content at the double/sample
57 level. $epsilon defaults to the platform DBL_EPSILON multiplied by
58 four.
59 is_image_similar($im1, $im2, $maxdiff, $comment)
61 Tests if the 2 images have similar content. Both images must be
62 defined, have the same width, height and channels. The sum of the
63 squares of the differences of each sample are calculated and must
64 be less than or equal to $maxdiff for the test to pass. The color
65 comparison is done at 8-bits per pixel. The color representation
66 such as direct vs paletted, bits per sample are not checked.
67 isnt_image($im1, $im2, $comment)
69 Tests that the two images are different. For regressions tests
70 where something (like text output of "0") produced no change, but
71 should have produced a change.
72 test_colorf_gpix($im, $x, $y, $expected, $epsilon, $comment)
74 Retrieves the pixel ($x,$y) from the low-level image $im and
75 compares it to the floating point color $expected, with a tolerance
76 of epsilon.
77 test_color_gpix($im, $x, $y, $expected, $comment)
79 Retrieves the pixel ($x,$y) from the low-level image $im and
80 compares it to the floating point color $expected.
81 test_colorf_glin($im, $x, $y, $pels, $comment)
83 Retrieves the floating point pixels ($x, $y)-[$x+@$pels, $y] from
84 the low level image $im and compares them against @$pels.
85 is_color_close3($color, $red, $green, $blue, $tolerance, $comment)
87 Tests if $color's first three channels are within $tolerance of
88 ($red, $green, $blue).
89 Test suite functions
91 Functions that perform one or more tests, typically used to test
92 various parts of Imager's implementation.
93 image_bounds_checks($im)
95 Attempts to write to various pixel positions outside the edge of
96 the image to ensure that it fails in those locations.
97 Any new image type should pass these tests. Does 16 separate
99 tests.
100 mask_tests($im, $epsilon)
102 Perform a standard set of mask tests on the OO image $im. Does 24
103 separate tests.
104 diff_text_with_nul($test_name, $text1, $text2, @options)
106 Creates 2 test images and writes $text1 to the first image and
107 $text2 to the second image with the string() method. Each call
108 adds 3 "ok"/"not ok" to the output of the test script.
109 Extra options that should be supplied include the font and either a
111 color or channel parameter.
112 This was explicitly created for regression tests on #21770.
114 std_font_tests({ font => $font })
116 Perform standard font interface tests.
117 std_font_test_count()
119 The number of tests performed by std_font_tests().
120 Helper functions
122 test_image_raw()
123 Returns a 150x150x3 Imager::ImgRaw test image.
124 test_image()
126 Returns a 150x150x3 8-bit/sample OO test image. Name: "basic".
127 test_image_16()
129 Returns a 150x150x3 16-bit/sample OO test image. Name: "basic16"
130 test_image_double()
132 Returns a 150x150x3 double/sample OO test image. Name:
133 "basic_double".
134 test_image_gray()
136 Returns a 150x150 single channel OO test image. Name: "gray".
137 test_image_gray_16()
139 Returns a 150x150 16-bit/sample single channel OO test image. Name:
140 "gray16".
141 test_image_mono()
143 Returns a 150x150 bilevel image that passes the is_bilevel() test.
144 Name: "mono".
145 test_image_named($name)
147 Return one of the other test images above based on name.
148 color_cmp($c1, $c2)
150 Performs an ordering of 3-channel colors (like <=>).
151 colorf_cmp($c1, $c2)
153 Performs an ordering of 3-channel floating point colors (like <=>).
154
156 Tony Cook <tony@develop-help.com>
157perl v5.32.0 2020-07-28 Imager::Test(3)