mirror of https://github.com/buggins/dlangui.git
Rewrote the decodeHexColor function (#656)
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Bagomot
GitHub
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1d5df4d634
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@ -20,7 +20,12 @@ module dlangui.graphics.colors;
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import dlangui.core.types;
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private import std.string : strip;
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import std.string;
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import std.algorithm;
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import std.traits;
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import std.conv;
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import std.range;
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import dimage.jpeg;
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/// special color constant to identify value as not a color (to use default/parent value instead)
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immutable uint COLOR_UNSPECIFIED = 0xFFDEADFF;
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@ -312,44 +317,95 @@ bool isFullyTransparentColor(uint color) pure nothrow {
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return (color >> 24) == 0xFF;
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}
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/// decode color string supported formats: #RGB #ARGB #RRGGBB #AARRGGBB
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uint decodeHexColor(string s, uint defValue = 0) pure {
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s = strip(s);
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switch (s) {
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case "@null":
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case "transparent":
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/// decode color string supported formats: #RGB, #ARGB, #RRGGBB, #AARRGGBB, rgb(r,g,b), rgba(r,g,b,a), rgba(r,g,b,a%)
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//TODO: the name doesn't match function
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uint decodeHexColor(string s, uint defValue = 0) { //pure
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s = s.strip.toLower;
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if (s.empty)
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return defValue;
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if (s == "@null" || s == "transparent")
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return COLOR_TRANSPARENT;
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case "black":
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return 0x000000;
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case "white":
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return 0xFFFFFF;
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case "red":
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return 0xFF0000;
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case "green":
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return 0x00FF00;
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case "blue":
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return 0x0000FF;
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case "gray":
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return 0x808080;
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case "lightgray":
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case "silver":
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return 0xC0C0C0;
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default:
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break;
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if (s.startsWith("#")) {
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if (s.length.among(4, 5, 7, 9)) { //#RGB #ARGB #RRGGBB #AARRGGBB
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s = s[1 .. $];
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auto color = parse!uint(s, 16); //RGB(A) by default
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if (s.length == 4)
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{ //ARGB
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color = ((color & 0xF00) >> 4) | ((color & 0xF0) << 8) | ((color & 0xF) << 20);
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}
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if (s.length != 4 && s.length != 5 && s.length != 7 && s.length != 9)
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return defValue;
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if (s[0] != '#')
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return defValue;
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uint value = 0;
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foreach(i; 1 .. s.length) {
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uint digit = parseHexDigit(s[i]);
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if (digit == uint.max)
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return defValue;
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value = (value << 4) | digit;
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if (s.length < 7) // double the same digit for short forms
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value = (value << 4) | digit;
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else if (s.length == 8)
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{ //AARRGGBB
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color = ((color & 0xFF00) >> 8) | ((color & 0xFF) << 24) | (
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(color & 0xFF0000) >> 8) | ((color & 0xFF000000) >> 24);
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}
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return value;
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return color;
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}
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return defValue;
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}
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else if (s.startsWith("rgba(") && s.endsWith(")"))
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{
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s = s[5 .. $ - 1];
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auto parts = s.split(",");
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if (parts.length != 4)
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return defValue;
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uint r = to!uint(parts[0].strip).clamp(0, 255);
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uint g = to!uint(parts[1].strip).clamp(0, 255);
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uint b = to!uint(parts[2].strip).clamp(0, 255);
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uint a = 255;
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auto ap = parts[3].strip;
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if (ap.endsWith("%")) { //rgba(r,g,b,a%)
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auto alpha = to!float(ap[0 .. $ - 1].strip);
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a = cast(uint)((alpha * 255.0 / 100.0) + 0.5).clamp(0, 255);
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}
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else { //rgba(r,g,b,a)
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auto alpha = to!float(parts[3].strip);
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a = cast(uint)(alpha * 255.0 + 0.5).clamp(0, 255);
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}
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if(a == 255)
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return (r << 16) | (g << 8) | b;
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return (a == 0) ? 0x00000000 : (a << 24) | (r << 16) | (g << 8) | b;
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}
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else if (s.startsWith("rgb(") && s.endsWith(")"))
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{
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s = s[4 .. $ - 1];
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auto parts = s.split(",");
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if (parts.length != 3)
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return defValue;
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uint r = to!uint(parts[0].strip).clamp(0, 255);
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uint g = to!uint(parts[1].strip).clamp(0, 255);
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uint b = to!uint(parts[2].strip).clamp(0, 255);
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return (r << 16) | (g << 8) | b;
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}
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foreach (color; __traits(allMembers, Color))
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{
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if (color == s)
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return color.to!Color;
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}
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return defValue;
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}
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unittest
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{
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static assert(decodeHexColor("") == 0);
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static assert(decodeHexColor("@null") == COLOR_TRANSPARENT);
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static assert(decodeHexColor("trAnsParent") == COLOR_TRANSPARENT);
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static assert(decodeHexColor("grAy") == 0x808080);
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static assert(decodeHexColor("#8B008B") == 0x8B008B);
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static assert(decodeHexColor("#fFf") == 0xfff);
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static assert(decodeHexColor("#f0F0") == 0xf0f0);
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static assert(decodeHexColor("#80ff0000") == 0x80ff0000);
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static assert(decodeHexColor("rgba(255, 0, 0,.5 )") == 0x80ff0000);
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static assert(decodeHexColor("rgba(255,0, 0, 50%)") == 0x80ff0000);
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static assert(decodeHexColor("rgba(255,0, 0, 100%)") == 0xff0000);
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static assert(decodeHexColor("rgba(255,0, 0, 0%)") == 0x00000000);
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static assert(decodeHexColor("rgb(255,255, 255)") == 0xffffff);
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static assert(decodeHexColor("rgba(255,0, 0, 150%)") == 0xff0000); // invalid input
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static assert(decodeHexColor("rgba(255,0, 0, -34%)") == 0x00000000); // invalid input
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static assert(decodeHexColor("rgb(321,321,321)") == 0xffffff); // invalid input
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static assert(decodeHexColor("not_valid_color_name") == 0x00000000); // invalid input, return def value
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static assert(decodeHexColor("#80ff00000") == 0x000000000); // invalid input, return def value
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static assert(decodeHexColor("#f0") == 0x00000000); // invalid input, return def value
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static assert(decodeHexColor("rgba(255,255, 255, 10)") == 0xffffff); // invalid input
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static assert(decodeHexColor("rgba(444,0, 0, -5)") == 0x00000000); // invalid input
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}
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