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Implement proper parsing of rgb / rgba CSS strings.

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This commit is contained in:
Jürg Lehni 2013-11-24 00:23:32 +01:00
parent 829e878243
commit b8b02417a0
1 changed files with 44 additions and 37 deletions
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81
src/style/Color.js
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@ -50,48 +50,57 @@ var Color = Base.extend(new function() {
gradient: ['gradient', 'origin', 'destination', 'highlight']
};
var componentParsers = {}, // Parsers of values for setters, by type and property
// Parsers of values for setters, by type and property
var componentParsers = {},
// Cache and canvas context for color name lookup
colorCache = {},
colorCtx;
function nameToRGB(name) {
var cached = colorCache[name];
if (!cached) {
// Use a canvas to draw to with the given name and then retrieve rgb
// values from. Build a cache for all the used colors.
if (!colorCtx) {
colorCtx = CanvasProvider.getContext(1, 1);
colorCtx.globalCompositeOperation = 'copy';
}
// Set the current fillStyle to transparent, so that it will be
// transparent instead of the previously set color in case the new
// color can not be interpreted.
colorCtx.fillStyle = 'rgba(0,0,0,0)';
// Set the fillStyle of the context to the passed name and fill the
// canvas with it, then retrieve the data for the drawn pixel:
colorCtx.fillStyle = name;
colorCtx.fillRect(0, 0, 1, 1);
var data = colorCtx.getImageData(0, 0, 1, 1).data;
cached = colorCache[name] = [
data[0] / 255,
data[1] / 255,
data[2] / 255
];
}
return cached.slice();
}
function hexToRGB(string) {
var hex = string.match(/^#?(\w{1,2})(\w{1,2})(\w{1,2})$/);
if (hex.length >= 4) {
var components = [0, 0, 0];
function fromCSS(string) {
var match = string.match(/^#(\w{1,2})(\w{1,2})(\w{1,2})$/),
components;
if (match) {
components = [0, 0, 0];
for (var i = 0; i < 3; i++) {
var value = hex[i + 1];
var value = match[i + 1];
components[i] = parseInt(value.length == 1
? value + value : value, 16) / 255;
}
return components;
} else if (match = string.match(/^rgba?\((.*)\)$/)) {
components = match[1].split(',');
for (var i = 0, l = components.length; i < l; i++) {
var value = parseFloat(components[i]);
components[i] = i < 3 ? value / 255 : value;
}
} else {
// Named
var cached = colorCache[string];
if (!cached) {
// Use a canvas to draw to with the given name and then retrieve
// RGB values from. Build a cache for all the used colors.
if (!colorCtx) {
colorCtx = CanvasProvider.getContext(1, 1);
colorCtx.globalCompositeOperation = 'copy';
}
// Set the current fillStyle to transparent, so that it will be
// transparent instead of the previously set color in case the
// new color can not be interpreted.
colorCtx.fillStyle = 'rgba(0,0,0,0)';
// Set the fillStyle of the context to the passed name and fill
// the canvas with it, then retrieve the data for the drawn
// pixel:
colorCtx.fillStyle = string;
colorCtx.fillRect(0, 0, 1, 1);
var data = colorCtx.getImageData(0, 0, 1, 1).data;
cached = colorCache[string] = [
data[0] / 255,
data[1] / 255,
data[2] / 255
];
}
components = cached.slice();
}
return components;
}
// For hsb-rgb conversion, used to lookup the right parameters in the
@ -533,9 +542,7 @@ var Color = Base.extend(new function() {
if (values.length > length)
values = slice.call(values, 0, length);
} else if (argType === 'string') {
components = arg.match(/^#[0-9a-f]{3,6}$/i)
? hexToRGB(arg)
: nameToRGB(arg);
components = fromCSS(arg);
type = 'rgb';
} else if (argType === 'object') {
if (arg.constructor === Color) {