codysnider / tt-rss

include/colors.php

<?php

if (file_exists("lib/floIcon.php")) {
    require_once "lib/floIcon.php";
}

function _resolve_htmlcolor($color) {
    $htmlcolors = array(
        "aliceblue" => "#f0f8ff",
        "antiquewhite" => "#faebd7",
        "aqua" => "#00ffff",
        "aquamarine" => "#7fffd4",
        "azure" => "#f0ffff",
        "beige" => "#f5f5dc",
        "bisque" => "#ffe4c4",
        "black" => "#000000",
        "blanchedalmond" => "#ffebcd",
        "blue" => "#0000ff",
        "blueviolet" => "#8a2be2",
        "brown" => "#a52a2a",
        "burlywood" => "#deb887",
        "cadetblue" => "#5f9ea0",
        "chartreuse" => "#7fff00",
        "chocolate" => "#d2691e",
        "coral" => "#ff7f50",
        "cornflowerblue" => "#6495ed",
        "cornsilk" => "#fff8dc",
        "crimson" => "#dc143c",
        "cyan" => "#00ffff",
        "darkblue" => "#00008b",
        "darkcyan" => "#008b8b",
        "darkgoldenrod" => "#b8860b",
        "darkgray" => "#a9a9a9",
        "darkgrey" => "#a9a9a9",
        "darkgreen" => "#006400",
        "darkkhaki" => "#bdb76b",
        "darkmagenta" => "#8b008b",
        "darkolivegreen" => "#556b2f",
        "darkorange" => "#ff8c00",
        "darkorchid" => "#9932cc",
        "darkred" => "#8b0000",
        "darksalmon" => "#e9967a",
        "darkseagreen" => "#8fbc8f",
        "darkslateblue" => "#483d8b",
        "darkslategray" => "#2f4f4f",
        "darkslategrey" => "#2f4f4f",
        "darkturquoise" => "#00ced1",
        "darkviolet" => "#9400d3",
        "deeppink" => "#ff1493",
        "deepskyblue" => "#00bfff",
        "dimgray" => "#696969",
        "dimgrey" => "#696969",
        "dodgerblue" => "#1e90ff",
        "firebrick" => "#b22222",
        "floralwhite" => "#fffaf0",
        "forestgreen" => "#228b22",
        "fuchsia" => "#ff00ff",
        "gainsboro" => "#dcdcdc",
        "ghostwhite" => "#f8f8ff",
        "gold" => "#ffd700",
        "goldenrod" => "#daa520",
        "gray" => "#808080",
        "grey" => "#808080",
        "green" => "#008000",
        "greenyellow" => "#adff2f",
        "honeydew" => "#f0fff0",
        "hotpink" => "#ff69b4",
        "indianred " => "#cd5c5c",
        "indigo " => "#4b0082",
        "ivory" => "#fffff0",
        "khaki" => "#f0e68c",
        "lavender" => "#e6e6fa",
        "lavenderblush" => "#fff0f5",
        "lawngreen" => "#7cfc00",
        "lemonchiffon" => "#fffacd",
        "lightblue" => "#add8e6",
        "lightcoral" => "#f08080",
        "lightcyan" => "#e0ffff",
        "lightgoldenrodyellow" => "#fafad2",
        "lightgray" => "#d3d3d3",
        "lightgrey" => "#d3d3d3",
        "lightgreen" => "#90ee90",
        "lightpink" => "#ffb6c1",
        "lightsalmon" => "#ffa07a",
        "lightseagreen" => "#20b2aa",
        "lightskyblue" => "#87cefa",
        "lightslategray" => "#778899",
        "lightslategrey" => "#778899",
        "lightsteelblue" => "#b0c4de",
        "lightyellow" => "#ffffe0",
        "lime" => "#00ff00",
        "limegreen" => "#32cd32",
        "linen" => "#faf0e6",
        "magenta" => "#ff00ff",
        "maroon" => "#800000",
        "mediumaquamarine" => "#66cdaa",
        "mediumblue" => "#0000cd",
        "mediumorchid" => "#ba55d3",
        "mediumpurple" => "#9370db",
        "mediumseagreen" => "#3cb371",
        "mediumslateblue" => "#7b68ee",
        "mediumspringgreen" => "#00fa9a",
        "mediumturquoise" => "#48d1cc",
        "mediumvioletred" => "#c71585",
        "midnightblue" => "#191970",
        "mintcream" => "#f5fffa",
        "mistyrose" => "#ffe4e1",
        "moccasin" => "#ffe4b5",
        "navajowhite" => "#ffdead",
        "navy" => "#000080",
        "oldlace" => "#fdf5e6",
        "olive" => "#808000",
        "olivedrab" => "#6b8e23",
        "orange" => "#ffa500",
        "orangered" => "#ff4500",
        "orchid" => "#da70d6",
        "palegoldenrod" => "#eee8aa",
        "palegreen" => "#98fb98",
        "paleturquoise" => "#afeeee",
        "palevioletred" => "#db7093",
        "papayawhip" => "#ffefd5",
        "peachpuff" => "#ffdab9",
        "peru" => "#cd853f",
        "pink" => "#ffc0cb",
        "plum" => "#dda0dd",
        "powderblue" => "#b0e0e6",
        "purple" => "#800080",
        "red" => "#ff0000",
        "rosybrown" => "#bc8f8f",
        "royalblue" => "#4169e1",
        "saddlebrown" => "#8b4513",
        "salmon" => "#fa8072",
        "sandybrown" => "#f4a460",
        "seagreen" => "#2e8b57",
        "seashell" => "#fff5ee",
        "sienna" => "#a0522d",
        "silver" => "#c0c0c0",
        "skyblue" => "#87ceeb",
        "slateblue" => "#6a5acd",
        "slategray" => "#708090",
        "slategrey" => "#708090",
        "snow" => "#fffafa",
        "springgreen" => "#00ff7f",
        "steelblue" => "#4682b4",
        "tan" => "#d2b48c",
        "teal" => "#008080",
        "thistle" => "#d8bfd8",
        "tomato" => "#ff6347",
        "turquoise" => "#40e0d0",
        "violet" => "#ee82ee",
        "wheat" => "#f5deb3",
        "white" => "#ffffff",
        "whitesmoke" => "#f5f5f5",
        "yellow" => "#ffff00",
        "yellowgreen" => "#9acd32"
    );

    $color = strtolower($color);

    if (isset($htmlcolors[$color])) {
            return $htmlcolors[$color];
    } else {
            return $color;
    }
    }

### RGB >> HSL
function _color_rgb2hsl($rgb) {
    $r = $rgb[0]; $g = $rgb[1]; $b = $rgb[2];
    $min = min($r, min($g, $b)); $max = max($r, max($g, $b));
    $delta = $max - $min; $l = ($min + $max) / 2; $s = 0;
    if ($l > 0 && $l < 1) {
        $s = $delta / ($l < 0.5 ? (2 * $l) : (2 - 2 * $l));
    }
    $h = 0;
    if ($delta > 0) {
        if ($max == $r && $max != $g) {
            $h += ($g - $b) / $delta;
        }
        if ($max == $g && $max != $b) {
            $h += (2 + ($b - $r) / $delta);
        }
        if ($max == $b && $max != $r) {
            $h += (4 + ($r - $g) / $delta);
        }
        $h /= 6;
    } return array($h, $s, $l);
}

### HSL >> RGB
function _color_hsl2rgb($hsl) {
    $h = $hsl[0]; $s = $hsl[1]; $l = $hsl[2];
    $m2 = ($l <= 0.5) ? $l * ($s + 1) : $l + $s - $l * $s;
    $m1 = $l * 2 - $m2;
    return array(_color_hue2rgb($m1, $m2, $h + 0.33333),
        _color_hue2rgb($m1, $m2, $h),
        _color_hue2rgb($m1, $m2, $h - 0.33333));
}

### Helper function for _color_hsl2rgb().
function _color_hue2rgb($m1, $m2, $h) {
    $h = ($h < 0) ? $h + 1 : (($h > 1) ? $h - 1 : $h);
    if ($h * 6 < 1) {
        return $m1 + ($m2 - $m1) * $h * 6;
    }
    if ($h * 2 < 1) {
        return $m2;
    }
    if ($h * 3 < 2) {
        return $m1 + ($m2 - $m1) * (0.66666 - $h) * 6;
    }
    return $m1;
}

### Convert a hex color into an RGB triplet.
function _color_unpack($hex, $normalize = false) {

    if (strpos($hex, '#') !== 0) {
            $hex = _resolve_htmlcolor($hex);
    } else {
            $hex = substr($hex, 1);
    }

    if (strlen($hex) == 4) {
        $hex = $hex[1].$hex[1].$hex[2].$hex[2].$hex[3].$hex[3];
    }
    $c = hexdec($hex);
    for ($i = 16; $i >= 0; $i -= 8) {
        $out[] = (($c >> $i) & 0xFF) / ($normalize ? 255 : 1);
    } return $out;

The variable $out does not seem to be defined for all execution paths leading up to this point.

}

### Convert an RGB triplet to a hex color.
function _color_pack($rgb, $normalize = false) {
    foreach ($rgb as $k => $v) {
        $out |= (($v * ($normalize ? 255 : 1)) << (16 - $k * 8));

The variable $out seems to be never defined.

    }return '#'.str_pad(dechex($out), 6, 0, STR_PAD_LEFT);
}

function rgb2hsl($arr) {
    $r = $arr[0];
    $g = $arr[1];
    $b = $arr[2];

    $var_R = ($r / 255);
    $var_G = ($g / 255);
    $var_B = ($b / 255);

    $var_Min = min($var_R, $var_G, $var_B);
    $var_Max = max($var_R, $var_G, $var_B);
    $del_Max = $var_Max - $var_Min;

    $v = $var_Max;

    if ($del_Max == 0) {
        $h = 0;
        $s = 0;
    } else {
        $s = $del_Max / $var_Max;

        $del_R = ((($var_Max - $var_R) / 6) + ($del_Max / 2)) / $del_Max;
        $del_G = ((($var_Max - $var_G) / 6) + ($del_Max / 2)) / $del_Max;
        $del_B = ((($var_Max - $var_B) / 6) + ($del_Max / 2)) / $del_Max;

        if ($var_R == $var_Max) {
            $h = $del_B - $del_G;
        } else if ($var_G == $var_Max) {
            $h = (1 / 3) + $del_R - $del_B;
        } else if ($var_B == $var_Max) {
            $h = (2 / 3) + $del_G - $del_R;
        }

        if ($h < 0) {

The variable $h does not seem to be defined for all execution paths leading up to this point.

            $h++;
        }
        if ($h > 1) {
            $h--;
        }
    }

    return array($h, $s, $v);
}

function hsl2rgb($arr) {
    $h = $arr[0];
    $s = $arr[1];
    $v = $arr[2];

    if ($s == 0) {
        $r = $g = $B = $v * 255;
    } else {
        $var_H = $h * 6;
        $var_i = floor($var_H);
        $var_1 = $v * (1 - $s);
        $var_2 = $v * (1 - $s * ($var_H - $var_i));
        $var_3 = $v * (1 - $s * (1 - ($var_H - $var_i)));

        if ($var_i == 0) { $var_R = $v; $var_G = $var_3; $var_B = $var_1; } else if ($var_i == 1) { $var_R = $var_2; $var_G = $v; $var_B = $var_1; } else if ($var_i == 2) { $var_R = $var_1; $var_G = $v; $var_B = $var_3; } else if ($var_i == 3) { $var_R = $var_1; $var_G = $var_2; $var_B = $v; } else if ($var_i == 4) { $var_R = $var_3; $var_G = $var_1; $var_B = $v; } else { $var_R = $v; $var_G = $var_1; $var_B = $var_2; }

        $r = $var_R * 255;
        $g = $var_G * 255;
        $B = $var_B * 255;
    }
    return array($r, $g, $B);
}

function colorPalette($imageFile, $numColors, $granularity = 5) {
    $granularity = max(1, abs((int) $granularity));
    $colors = array();

    $size = @getimagesize($imageFile);

    // to enable .ico support place floIcon.php into lib/
    if (strtolower($size['mime']) == 'image/vnd.microsoft.icon') {

        if (class_exists("floIcon")) {

            $ico = new floIcon();
            @$ico->readICO($imageFile);

It seems like you do not handle an error condition for readICO(). This can introduce security issues, and is generally not recommended.

Are you sure the usage of $ico->readICO($imageFile) targeting floIcon::readICO() seems to always return null.

            if (count($ico->images) == 0) {
                            return false;
            } else {
                            $img = @$ico->images[count($ico->images) - 1]->getImageResource();
            }

        } else {
            return false;
        }

    } else if ($size[0] > 0 && $size[1] > 0) {
        $img = @imagecreatefromstring(file_get_contents($imageFile));
    }

    if (!$img) {

The variable $img does not seem to be defined for all execution paths leading up to this point.

        return false;
    }

    for ($x = 0; $x < $size[0]; $x += $granularity) {
        for ($y = 0; $y < $size[1]; $y += $granularity) {
            $thisColor = imagecolorat($img, $x, $y);
            $rgb = imagecolorsforindex($img, $thisColor);
            $red = round(round(($rgb['red'] / 0x33)) * 0x33);
            $green = round(round(($rgb['green'] / 0x33)) * 0x33);
            $blue = round(round(($rgb['blue'] / 0x33)) * 0x33);
            $thisRGB = sprintf('%02X%02X%02X', $red, $green, $blue);
            if (array_key_exists($thisRGB, $colors)) {
                $colors[$thisRGB]++;
            } else {
                $colors[$thisRGB] = 1;
            }
        }
    }

    arsort($colors);
    return array_slice(array_keys($colors), 0, $numColors);
}

function calculate_avg_color($iconFile) {
    $palette = colorPalette($iconFile, 4, 4);

    if (is_array($palette)) {
        foreach ($palette as $p) {
            $hsl = rgb2hsl(_color_unpack("#$p"));

            if ($hsl[1] > 0.25 && $hsl[2] > 0.25 &&
                !($hsl[0] >= 0 && $hsl[0] < 0.01 && $hsl[1] < 0.01) &&
                !($hsl[0] >= 0 && $hsl[0] < 0.01 && $hsl[2] > 0.99)) {

                return _color_pack(hsl2rgb($hsl));
            }
        }
    }
    return '';
}