mirror of
https://github.com/scratchfoundation/paper.js.git
synced 2024-12-29 09:22:22 -05:00
Restructure BlendMode code, fix issues with color-dodge and color-burn, and create BlendModes.html example.
All modes should be implemented according to specs now.
This commit is contained in:
Jürg Lehni
parent
1b42822c2d
commit
b133d8fe2e
2 changed files with 273 additions and 190 deletions
65
examples/Scripts/BlendModes.html
Normal file
65
examples/Scripts/BlendModes.html
Normal file
File diff suppressed because one or more lines are too long
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@ -10,201 +10,219 @@
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* All rights reserved.
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*/
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var BlendMode = {
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process: function(blendMode, srcContext, dstContext, alpha, offset) {
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var BlendMode = new function() {
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var min = Math.min,
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max = Math.max,
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abs = Math.abs,
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sr, sg, sb, sa, // source
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br, bg, bb, ba, // backdrop
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dr, dg, db; // destination
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// Conversion methods for HSL modes, as described by
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// http://www.aiim.org/documents/standards/pdf/blend_modes.pdf
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// The setters modify the variables dr, dg, db directly.
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function getLum(r, g, b) {
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return 0.2989 * r + 0.587 * g + 0.114 * b;
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}
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function setLum(r, g, b, l) {
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var d = l - getLum(r, g, b);
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dr = r + d;
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dg = g + d;
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db = b + d;
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var l = getLum(dr, dg, db),
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mn = min(dr, dg, db),
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mx = max(dr, dg, db);
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if (mn < 0) {
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var lmn = l - mn;
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dr = l + (dr - l) * l / lmn;
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dg = l + (dg - l) * l / lmn;
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db = l + (db - l) * l / lmn;
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}
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if (mx > 255) {
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var ln = 255 - l,
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mxl = mx - l;
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dr = l + (dr - l) * ln / mxl;
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dg = l + (dg - l) * ln / mxl;
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db = l + (db - l) * ln / mxl;
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}
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}
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function getSat(r, g, b) {
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return max(r, g, b) - min(r, g, b);
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}
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function setSat(r, g, b, s) {
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var col = [r, g, b],
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mx = max(r, g, b), // max
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mn = min(r, g, b), // min
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md; // mid
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// Determine indices for min and max in col:
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mn = mn === r ? 0 : mn === g ? 1 : 2;
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mx = mx === r ? 0 : mx === g ? 1 : 2;
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// Determine the index in col that is not used yet by min and max,
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// and assign it to mid:
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md = min(mn, mx) === 0 ? max(mn, mx) === 1 ? 2 : 1 : 0;
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// Now perform the actual algorithm
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if (col[mx] > col[mn]) {
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col[md] = (col[md] - col[mn]) * s / (col[mx] - col[mn]);
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col[mx] = s;
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} else {
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col[md] = col[mx] = 0;
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}
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col[mn] = 0;
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// Finally write out the values
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dr = col[0];
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dg = col[1];
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db = col[2];
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}
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var modes = {
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// B(Cb, Cs) = Cb x Cs
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multiply: function() {
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dr = br * sr / 255;
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dg = bg * sg / 255;
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db = bb * sb / 255;
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},
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// B(Cb, Cs) = 1 - [(1 - Cb) x (1 - Cs)] = Cb + Cs -(Cb x Cs)
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screen: function() {
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dr = br + sr - (br * sr / 255);
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dg = bg + sg - (bg * sg / 255);
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db = bb + sb - (bb * sb / 255);
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},
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// B(Cb, Cs) = HardLight(Cs, Cb)
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overlay: function() {
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// = Reverse of hard-light
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dr = br < 128 ? 2 * br * sr / 255 : 255 - 2 * (255 - br) * (255 - sr) / 255;
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dg = bg < 128 ? 2 * bg * sg / 255 : 255 - 2 * (255 - bg) * (255 - sg) / 255;
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db = bb < 128 ? 2 * bb * sb / 255 : 255 - 2 * (255 - bb) * (255 - sb) / 255;
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},
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'soft-light': function() {
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var t = sr * br / 255;
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dr = t + br * (255 - (255 - br) * (255 - sr) / 255 - t) / 255;
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t = sg * bg / 255;
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dg = t + bg * (255 - (255 - bg) * (255 - sg) / 255 - t) / 255;
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t = sb * bb / 255;
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db = t + bb * (255 - (255 - bb) * (255 - sb) / 255 - t) / 255;
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},
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// if (Cs <= 0.5) B(Cb, Cs) = Multiply(Cb, 2 x Cs)
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// else B(Cb, Cs) = Screen(Cb, 2 x Cs -1)
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'hard-light': function() {
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dr = sr < 128 ? 2 * sr * br / 255 : 255 - 2 * (255 - sr) * (255 - br) / 255;
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dg = sg < 128 ? 2 * sg * bg / 255 : 255 - 2 * (255 - sg) * (255 - bg) / 255;
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db = sb < 128 ? 2 * sb * bb / 255 : 255 - 2 * (255 - sb) * (255 - bb) / 255;
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},
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// if (Cb == 0) B(Cb, Cs) = 0
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// else if (Cs == 1) B(Cb, Cs) = 1
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// else B(Cb, Cs) = min(1, Cb / (1 - Cs))
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'color-dodge': function() {
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dr = br === 0 ? 0 : sr === 255 ? 255 : min(255, 255 * br / (255 - sr));
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dg = bg === 0 ? 0 : sg === 255 ? 255 : min(255, 255 * bg / (255 - sg));
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db = bb === 0 ? 0 : sb === 255 ? 255 : min(255, 255 * bb / (255 - sb));
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},
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// if (Cb == 1) B(Cb, Cs) = 1
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// else if(Cs == 0) B(Cb, Cs) = 0
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// else B(Cb, Cs) = 1 - min(1, (1 - Cb) / Cs)
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'color-burn': function() {
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dr = br === 255 ? 255 : sr === 0 ? 0 : max(0, 255 - (255 - br) * 255 / sr);
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dg = bg === 255 ? 255 : sg === 0 ? 0 : max(0, 255 - (255 - bg) * 255 / sg);
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db = bb === 255 ? 255 : sb === 0 ? 0 : max(0, 255 - (255 - bb) * 255 / sb);
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},
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// B(Cb, Cs) = min(Cb, Cs)
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darken: function() {
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dr = br < sr ? br : sr;
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dg = bg < sg ? bg : sg;
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db = bb < sb ? bb : sb;
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},
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// B(Cb, Cs) = max(Cb, Cs)
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lighten: function() {
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dr = br > sr ? br : sr;
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dg = bg > sg ? bg : sg;
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db = bb > sb ? bb : sb;
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},
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// B(Cb, Cs) = | Cb - Cs |
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difference: function() {
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dr = br - sr;
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if (dr < 0)
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dr = -dr;
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dg = bg - sg;
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if (dg < 0)
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dg = -dg;
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db = bb - sb;
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if (db < 0)
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db = -db;
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},
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// B(Cb, Cs) = Cb + Cs - 2 x Cb x Cs
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exclusion: function() {
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dr = br + sr * (255 - br - br) / 255;
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dg = bg + sg * (255 - bg - bg) / 255;
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db = bb + sb * (255 - bb - bb) / 255;
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},
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// HSL Modes:
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hue: function() {
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setSat(sr, sg, sb, getSat(br, bg, bb));
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setLum(dr, dg, db, getLum(br, bg, bb));
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},
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saturation: function() {
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setSat(br, bg, bb, getSat(sr, sg, sb));
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setLum(dr, dg, db, getLum(br, bg, bb));
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},
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luminosity: function() {
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setLum(br, bg, bb, getLum(sr, sg, sb));
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},
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color: function() {
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setLum(sr, sg, sb, getLum(br, bg, bb));
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},
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// TODO: Not in Illustrator:
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add: function() {
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dr = min(br + sr, 255);
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dg = min(bg + sg, 255);
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db = min(bb + sb, 255);
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},
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subtract: function() {
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dr = max(br - sr, 0);
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dg = max(bg - sg, 0);
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db = max(bb - sb, 0);
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},
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average: function() {
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dr = (br + sr) / 2;
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dg = (bg + sg) / 2;
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db = (bb + sb) / 2;
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},
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negation: function() {
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dr = 255 - abs(255 - sr - br);
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dg = 255 - abs(255 - sg - bg);
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db = 255 - abs(255 - sb - bb);
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}
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};
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this.process = function(blendMode, srcContext, dstContext, alpha, offset) {
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var srcCanvas = srcContext.canvas,
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dstData = dstContext.getImageData(offset.x, offset.y,
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srcCanvas.width, srcCanvas.height),
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dst = dstData.data,
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src = srcContext.getImageData(0, 0,
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srcCanvas.width, srcCanvas.height).data,
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min = Math.min,
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max = Math.max,
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abs = Math.abs,
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sr, sg, sb, sa, // source
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br, bg, bb, ba, // backdrop
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dr, dg, db; // destination
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srcCanvas.width, srcCanvas.height).data;
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// Conversion methods for HSL modes, as described by
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// http://www.aiim.org/documents/standards/pdf/blend_modes.pdf
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// The setters modify the variables dr, dg, db directly.
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function getLum(r, g, b) {
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return 0.2989 * r + 0.587 * g + 0.114 * b;
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}
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function setLum(r, g, b, l) {
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var d = l - getLum(r, g, b);
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dr = r + d;
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dg = g + d;
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db = b + d;
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var l = getLum(dr, dg, db),
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mn = min(dr, dg, db),
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mx = max(dr, dg, db);
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if (mn < 0) {
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var lmn = l - mn;
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dr = l + (dr - l) * l / lmn;
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dg = l + (dg - l) * l / lmn;
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db = l + (db - l) * l / lmn;
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}
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if (mx > 255) {
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var ln = 255 - l, mxl = mx - l;
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dr = l + (dr - l) * ln / mxl;
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dg = l + (dg - l) * ln / mxl;
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db = l + (db - l) * ln / mxl;
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}
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}
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function getSat(r, g, b) {
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return max(r, g, b) - min(r, g, b);
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}
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function setSat(r, g, b, s) {
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var col = [r, g, b],
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mx = max(r, g, b), // max
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mn = min(r, g, b), // min
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md; // mid
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// Determine indices for min and max in col:
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mn = mn == r ? 0 : mn == g ? 1 : 2;
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mx = mx == r ? 0 : mx == g ? 1 : 2;
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// Determine the index in col that is not used yet by min and max,
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// and assign it to mid:
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md = min(mn, mx) == 0 ? max(mn, mx) == 1 ? 2 : 1 : 0;
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// Now perform the actual algorithm
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if (col[mx] > col[mn]) {
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col[md] = (col[md] - col[mn]) * s / (col[mx] - col[mn]);
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col[mx] = s;
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} else {
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col[md] = col[mx] = 0;
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}
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col[mn] = 0;
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// Finally write out the values
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dr = col[0];
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dg = col[1];
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db = col[2];
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}
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var modes = {
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multiply: function() {
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dr = br * sr / 255;
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dg = bg * sg / 255;
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db = bb * sb / 255;
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},
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screen: function() {
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dr = 255 - (255 - br) * (255 - sr) / 255;
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dg = 255 - (255 - bg) * (255 - sg) / 255;
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db = 255 - (255 - bb) * (255 - sb) / 255;
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},
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overlay: function() {
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dr = br < 128 ? 2 * br * sr / 255 : 255 - 2 * (255 - br) * (255 - sr) / 255;
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dg = bg < 128 ? 2 * bg * sg / 255 : 255 - 2 * (255 - bg) * (255 - sg) / 255;
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db = bb < 128 ? 2 * bb * sb / 255 : 255 - 2 * (255 - bb) * (255 - sb) / 255;
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},
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'soft-light': function() {
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var t = sr * br / 255;
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dr = t + br * (255 - (255 - br) * (255 - sr) / 255 - t) / 255;
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t = sg * bg / 255;
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dg = t + bg * (255 - (255 - bg) * (255 - sg) / 255 - t) / 255;
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t = sb * bb / 255;
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db = t + bb * (255 - (255 - bb) * (255 - sb) / 255 - t) / 255;
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},
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'hard-light': function() {
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// = Reverse of overlay
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dr = sr < 128 ? 2 * sr * br / 255 : 255 - 2 * (255 - sr) * (255 - br) / 255;
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dg = sg < 128 ? 2 * sg * bg / 255 : 255 - 2 * (255 - sg) * (255 - bg) / 255;
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db = sb < 128 ? 2 * sb * bb / 255 : 255 - 2 * (255 - sb) * (255 - bb) / 255;
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},
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'color-dodge': function() {
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dr = sr == 255 ? sr : min(255, br * 255 / (255 - sr));
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dg = sg == 255 ? sg : min(255, bg * 255 / (255 - sg));
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db = sb == 255 ? sb : min(255, bb * 255 / (255 - sb));
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},
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'color-burn': function() {
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dr = sr == 0 ? 0 : max(255 - ((255 - br) * 255) / sr, 0);
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dg = sg == 0 ? 0 : max(255 - ((255 - bg) * 255) / sg, 0);
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db = sb == 0 ? 0 : max(255 - ((255 - bb) * 255) / sb, 0);
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},
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darken: function() {
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dr = br < sr ? br : sr;
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dg = bg < sg ? bg : sg;
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db = bb < sb ? bb : sb;
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},
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lighten: function() {
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dr = br > sr ? br : sr;
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dg = bg > sg ? bg : sg;
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db = bb > sb ? bb : sb;
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},
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difference: function() {
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dr = br - sr;
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if (dr < 0)
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dr = -dr;
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dg = bg - sg;
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if (dg < 0)
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dg = -dg;
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db = bb - sb;
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if (db < 0)
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db = -db;
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},
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exclusion: function() {
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dr = br + sr * (255 - br - br) / 255;
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dg = bg + sg * (255 - bg - bg) / 255;
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db = bb + sb * (255 - bb - bb) / 255;
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},
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// HSL Modes:
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hue: function() {
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setSat(sr, sg, sb, getSat(br, bg, bb));
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setLum(dr, dg, db, getLum(br, bg, bb));
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},
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saturation: function() {
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setSat(br, bg, bb, getSat(sr, sg, sb));
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setLum(dr, dg, db, getLum(br, bg, bb));
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},
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luminosity: function() {
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setLum(br, bg, bb, getLum(sr, sg, sb));
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},
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color: function() {
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setLum(sr, sg, sb, getLum(br, bg, bb));
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},
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// TODO: Not in Illustrator:
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add: function() {
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dr = min(br + sr, 255);
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dg = min(bg + sg, 255);
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db = min(bb + sb, 255);
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},
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subtract: function() {
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dr = max(br - sr, 0);
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dg = max(bg - sg, 0);
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db = max(bb - sb, 0);
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},
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average: function() {
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dr = (br + sr) / 2;
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dg = (bg + sg) / 2;
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db = (bb + sb) / 2;
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},
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negation: function() {
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dr = 255 - abs(255 - sr - br);
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dg = 255 - abs(255 - sg - bg);
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db = 255 - abs(255 - sb - bb);
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}
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};
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var process = modes[blendMode];
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if (!process)
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@ -228,5 +246,5 @@ var BlendMode = {
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dst[i + 3] = sa * alpha + a2 * ba;
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}
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dstContext.putImageData(dstData, offset.x, offset.y);
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}
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};
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};
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