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Implement HSB blend modes.

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This commit is contained in:
Jürg Lehni 2011-06-01 20:21:25 +01:00
parent ad8f046880
commit d5952ba043
1 changed files with 36 additions and 10 deletions
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46
src/util/BlendMode.js
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@ -49,9 +49,30 @@ var BlendMode = {
min = Math.min, min = Math.min,
max = Math.max, max = Math.max,
abs = Math.abs, abs = Math.abs,
sr, sb, sg, sa, // source sr, sg, sb, sa, // source
br, bb, bg, ba, // backdrop br, bg, bb, ba, // backdrop
dr, dg, db; // destination dr, dg, db, // destination
hsb = [],
// lookup table with indices for each hsb blend mode and hsb
// component inside the hsb table: 0 = source, 1 = backdrop
hsbIndices = {
hue: [0, 1, 1],
saturation: [1, 0, 1],
luminosity: [1, 1, 0],
color: [0, 0, 1]
}[blendMode];
function processHsb() {
hsb[0] = Color.RGBtoHSB(sr / 255, sg / 255, sb / 255);
hsb[1] = Color.RGBtoHSB(br / 255, bg / 255, bb / 255);
var rgb = Color.HSBtoRGB(
hsb[hsbIndices[0]][0],
hsb[hsbIndices[1]][1],
hsb[hsbIndices[2]][2]);
dr = rgb[0] * 255;
dg = rgb[1] * 255;
db = rgb[2] * 255;
}
var modes = { var modes = {
multiply: function() { multiply: function() {
@ -74,12 +95,12 @@ var BlendMode = {
}, },
'soft-light': function() { 'soft-light': function() {
var d = sr * br / 255; var t = sr * br / 255;
dr = d + br * (255 - (255 - br) * (255 - sr) / 255 - d) / 255; dr = t + br * (255 - (255 - br) * (255 - sr) / 255 - t) / 255;
d = sg * bg / 255; t = sg * bg / 255;
dg = d + bg * (255 - (255 - bg) * (255 - sg) / 255 - d) / 255; dg = t + bg * (255 - (255 - bg) * (255 - sg) / 255 - t) / 255;
d = sb * bb / 255; t = sb * bb / 255;
db = d + bb * (255 - (255 - bb) * (255 - sb) / 255 - d) / 255; db = t + bb * (255 - (255 - bb) * (255 - sb) / 255 - t) / 255;
}, },
'hard-light': function() { 'hard-light': function() {
@ -130,7 +151,12 @@ var BlendMode = {
db = bb + sb * (255 - bb - bb) / 255; db = bb + sb * (255 - bb - bb) / 255;
}, },
// TODO: Missing: hue, saturation, color, luminosity // HSB modes:
hue: processHsb,
saturation: processHsb,
luminosity: processHsb,
color: processHsb,
// TODO: Not in Illustrator: // TODO: Not in Illustrator:
add: function() { add: function() {