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Update parseCssColor so that it can also handle an array of rgba valu… #7

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29 changes: 18 additions & 11 deletions src/webglimpse/color.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -97,27 +97,34 @@ module Webglimpse {
* - hsl/hsla
* - named colors
*
* Also, this can take in an array of rgba values as an optimization. Example: [ 0.5, 0.5, 0.5, 0.5 ]
*
* Behavior is undefined for strings that are not in one of the listed notations.
*
* Note that different browsers may use different color values for the named colors.
* Typescript 1.0.1 doesn't seem to support the | operator, so using the 'any' type until webglimpse moves to a newer version.
*
*/
export var parseCssColor = ( function( ) {
var canvas = document.createElement( 'canvas' );
canvas.width = 1;
canvas.height = 1;
var g = canvas.getContext( '2d' );
return function( cssColorString : string ) : Color {
g.clearRect( 0, 0, 1, 1 );
g.fillStyle = cssColorString;
g.fillRect( 0, 0, 1, 1 );

var rgbaData = g.getImageData( 0, 0, 1, 1 ).data;
var R = rgbaData[ 0 ] / 255;
var G = rgbaData[ 1 ] / 255;
var B = rgbaData[ 2 ] / 255;
var A = rgbaData[ 3 ] / 255;
return rgba( R, G, B, A );
return function( cssColorString : any ) : Color {
if(!Array.isArray(cssColorString)) {
g.clearRect( 0, 0, 1, 1 );
g.fillStyle = cssColorString;
g.fillRect( 0, 0, 1, 1 );

var rgbaData = g.getImageData( 0, 0, 1, 1 ).data;
var R = rgbaData[ 0 ] / 255;
var G = rgbaData[ 1 ] / 255;
var B = rgbaData[ 2 ] / 255;
var A = rgbaData[ 3 ] / 255;
return rgba( R, G, B, A );
} else {
return rgba(cssColorString[0], cssColorString[1], cssColorString[2], cssColorString[3]);
}
}
} )( );

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