lsm/konva
1
0
Fork 0
mirror of https://github.com/konvajs/konva.git synced 2026-03-03 16:58:33 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Made enhance filter tweenable (-1=grey;0=no change;1=max enhancement)

Browse Source
This commit is contained in:
ippo615
2014-01-04 12:31:11 -05:00
parent b52845b32b
commit e57f3802df
2 changed files with 105 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

72
src/filters/Enhance.js
View File

@@ -32,15 +32,19 @@
*/
Kinetic.Filters.Enhance = function (imageData) {
var data = imageData.data,
nPixels = data.length,
nSubPixels = data.length,
rMin = data[0], rMax = rMin, r,
gMin = data[1], gMax = gMin, g,
bMin = data[3], bMax = bMin, b,
aMin = data[4], aMax = aMin, a,
bMin = data[2], bMax = bMin, b,
aMin = data[3], aMax = aMin, a,
i;
// If we are not enhancing anything - don't do any computation
var enhanceAmount = this.enhance();
if( enhanceAmount === 0 ){ return; }
// 1st Pass - find the min and max for each channel:
for (i = 0; i < nPixels; i += 4) {
for (i = 0; i < nSubPixels; i += 4) {
r = data[i + 0];
if (r < rMin) { rMin = r; } else
if (r > rMax) { rMax = r; }
@@ -50,9 +54,9 @@
b = data[i + 2];
if (b < bMin) { bMin = b; } else
if (b > bMax) { bMax = b; }
a = data[i + 3];
if (a < aMin) { aMin = a; } else
if (a > aMax) { aMax = a; }
//a = data[i + 3];
//if (a < aMin) { aMin = a; } else
//if (a > aMax) { aMax = a; }
}
// If there is only 1 level - don't remap
@@ -61,12 +65,54 @@
if( bMax === bMin ){ bMax = 255; bMin = 0; }
if( aMax === aMin ){ aMax = 255; aMin = 0; }
// Pass 2 - remap everything to fill the full range
for (i = 0; i < nPixels; i += 1) {
data[i + 0] = remap(data[i + 0], rMin, rMax, 0, 255);
data[i + 1] = remap(data[i + 1], gMin, gMax, 0, 255);
data[i + 2] = remap(data[i + 2], bMin, bMax, 0, 255);
data[i + 3] = remap(data[i + 3], aMin, aMax, 0, 255);
var rMid, rGoalMax,rGoalMin,
gMid, gGoalMax,gGoalMin,
bMid, bGoalMax,aGoalMin,
aMid, aGoalMax,bGoalMin;
// If the enhancement is positive - stretch the histogram
if( enhanceAmount > 0 ){
rGoalMax = rMax + enhanceAmount*(255-rMax);
rGoalMin = rMin - enhanceAmount*(rMin-0);
gGoalMax = gMax + enhanceAmount*(255-gMax);
gGoalMin = gMin - enhanceAmount*(gMin-0);
bGoalMax = bMax + enhanceAmount*(255-bMax);
bGoalMin = bMin - enhanceAmount*(bMin-0);
aGoalMax = aMax + enhanceAmount*(255-aMax);
aGoalMin = aMin - enhanceAmount*(aMin-0);
// If the enhancement is negative - compress the histogram
}else{
rMid = (rMax + rMin)*0.5;
rGoalMax = rMax + enhanceAmount*(rMax-rMid);
rGoalMin = rMin + enhanceAmount*(rMin-rMid);
gMid = (gMax + gMin)*0.5;
gGoalMax = gMax + enhanceAmount*(gMax-gMid);
gGoalMin = gMin + enhanceAmount*(gMin-gMid);
bMid = (bMax + bMin)*0.5;
bGoalMax = bMax + enhanceAmount*(bMax-bMid);
bGoalMin = bMin + enhanceAmount*(bMin-bMid);
aMid = (aMax + aMin)*0.5;
aGoalMax = aMax + enhanceAmount*(aMax-aMid);
aGoalMin = aMin + enhanceAmount*(aMin-aMid);
}
// Pass 2 - remap everything, except the alpha
for (i = 0; i < nSubPixels; i += 4) {
data[i + 0] = remap(data[i + 0], rMin, rMax, rGoalMin, rGoalMax);
data[i + 1] = remap(data[i + 1], gMin, gMax, gGoalMin, gGoalMax);
data[i + 2] = remap(data[i + 2], bMin, bMax, bGoalMin, bGoalMax);
//data[i + 3] = remap(data[i + 3], aMin, aMax, aGoalMin, aGoalMax);
}
};
Kinetic.Factory.addFilterGetterSetter(Kinetic.Node, 'enhance', 0);
/**
* get/set enhance
* @name enhance
* @method
* @memberof Kinetic.Node.prototype
* @param {Float} amount
* @returns {Float}
*/
})();