yetangitu/pixstatic
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

added a fast mosaic effect

Browse source
This commit is contained in:
Peihong Guo 2013-11-28 02:40:30 -06:00
parent 0a99d49911
commit eaacd74ea9
2 changed files with 44 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
index.html
View file

@ -137,6 +137,12 @@
options : {
amount : 0.5
}
},
{
effect : 'mosaic',
options : {
blockSize : 8
}
}
];

39
pixastic.effects.js
View file

@ -1184,8 +1184,45 @@ Pixastic.Effects = (function() {
}
}
}
}
},
mosaic : function(inData, outData, width, height, options, progress) {
var blockSize = clamp(options.blockSize, 1, Math.max(width, height)),
yBlocks = Math.ceil(height / blockSize),
xBlocks = Math.ceil(width / blockSize),
y0, y1, x0, x1, idx, pidx,
n = yBlocks * xBlocks,
prog, lastProg = 0;
for (i=0, y0=0, bidx=0;i<yBlocks;i++) {
y1 = clamp(y0 + blockSize, 0, height);
for(j=0, x0=0;j<xBlocks;j++,bidx++) {
x1 = clamp(x0 + blockSize, 0, width);
idx = (y0 * width + x0) << 2;
var r = inData[idx], g = inData[idx+1], b = inData[idx+2];
for(bi=y0;bi<y1;bi++) {
for(bj=x0;bj<x1;bj++) {
pidx = (bi*width+bj) << 2;
outData[pidx] = r, outData[pidx+1] = g, outData[pidx+2] = b;
outData[pidx+3] = inData[pidx+3];
}
}
x0 = x1;
if (progress) {
prog = (bidx/n*100 >> 0) / 100;
if (prog > lastProg) {
lastProg = progress(prog);
}
}
}
y0 = y1;
}
}
};
})();