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As has been reported, 1-dimensional horizontal filled polygons are not drawn at all. That is caused by the scanline algorithm used for drawing filled polygons which skips the drawing of horizontal edges, because that is normally not necessary. If, however, the polygon consists of horizontal edges only, that obviously doesn't work, so we add a special case handling. That has also been fixed in libgd with <https://github.com/libgd/libgd/commit/f9f10fa9>.
39 lines
693 B
PHP
39 lines
693 B
PHP
--TEST--
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Bug #64641 (imagefilledpolygon doesn't draw horizontal line)
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--SKIPIF--
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<?php
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if (!extension_loaded('gd')) die("skip gd extension not available\n");
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?>
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--FILE--
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<?php
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require_once __DIR__ . '/similarity.inc';
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$im = imagecreatetruecolor(640, 480);
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$points = array(
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100, 100,
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100, 200,
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100, 300
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);
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imagefilledpolygon($im, $points, 3, 0xFFFF00);
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$points = array(
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300, 200,
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400, 200,
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500, 200
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);
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imagefilledpolygon($im, $points, 3, 0xFFFF00);
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$ex = imagecreatefrompng(__DIR__ . '/bug64641.png');
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if (($diss = calc_image_dissimilarity($ex, $im)) < 1e-5) {
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echo "IDENTICAL";
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} else {
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echo "DISSIMILARITY: $diss";
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}
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imagedestroy($ex);
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imagedestroy($im);
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?>
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--EXPECT--
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IDENTICAL
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