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Shorten variable names.

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This commit is contained in:
Jürg Lehni 2011-06-01 16:45:42 +01:00
parent 44605433d1
commit 62f5204810
1 changed files with 13 additions and 13 deletions
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26
src/util/BlendMode.js
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@ -47,24 +47,24 @@ var BlendMode = {
src = sourceContext.getImageData(0, 0,
sourceCanvas.width, sourceCanvas.height).data,
min = Math.min,
sA, dA, rA, sM, dM, demultiply;
sA, dA, rA, sM, dM, rM;
// TODO: Some blend modes seem broken at the moment, e.g.
// dodge, burn
var modes = {
normal: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s + d * (1 - sA)) * demultiply;
dst[i] = (s + d * (1 - sA)) * rM;
},
multiply: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s * d + s * (1 - dA) + d * (1 - sA)) * demultiply;
dst[i] = (s * d + s * (1 - dA) + d * (1 - sA)) * rM;
},
screen: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s * (1 - d) + d) * demultiply;
dst[i] = (s * (1 - d) + d) * rM;
},
overlay: function(i) {
@ -82,32 +82,32 @@ var BlendMode = {
'color-dodge': function(i) {
var s = src[i], d = dst[i]; // both unmultiplied
dst[i] = s == 255 && d * dM == 0 ? 255 : min(255, d / (255 - s)) * demultiply;
dst[i] = s == 255 && d * dM == 0 ? 255 : min(255, d / (255 - s)) * rM;
},
'color-burn': function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = src[i] == 0 && d == 0 ? 0 : (1 - min(1, (1 - d) / s)) * demultiply;
dst[i] = src[i] == 0 && d == 0 ? 0 : (1 - min(1, (1 - d) / s)) * rM;
},
darken: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s > d ? d : s) * demultiply;
dst[i] = (s > d ? d : s) * rM;
},
lighten: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s < d ? d : s) * demultiply;
dst[i] = (s < d ? d : s) * rM;
},
difference: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (s + d - 2 * min(s * dA, d * sA)) * demultiply;
dst[i] = (s + d - 2 * min(s * dA, d * sA)) * rM;
},
exclusion: function(i) {
var s = src[i] * sM, d = dst[i] * dM;
dst[i] = (d + s - 2 * d * s) * demultiply;
dst[i] = (d + s - 2 * d * s) * rM;
},
// TODO: Missing: hue, saturation, color, luminosity
@ -115,13 +115,13 @@ var BlendMode = {
// TODO: Not in Illustrator. Remove these?
'src-in': function(i) {
// Only differs from Photoshop in low - opacity areas
dst[i] = sRA * dA * demultiply;
dst[i] = sRA * dA * rM;
},
add: function(i) {
// Photoshop doesn't simply add the alpha channels,
// this might be correct wrt SVG 1.2
dst[i] = min(sRA + dRA, 1) * demultiply;
dst[i] = min(sRA + dRA, 1) * rM;
}
};
@ -147,7 +147,7 @@ var BlendMode = {
dA = dst[i + 3] / 255;
// Result alpha:
rA = alpha ? alpha(sA, dA) : sA + dA - sA * dA;
demultiply = 255 / rA;
rM = 255 / rA;
// Multipliers:
sM = sA / 255;
dM = dA / 255;