function drawPixels()

in toolkit/jb/shared.js [411:446]

• 24 lines of code
• 6 McCabe index (conditional complexity)

function drawPixels(p, config, ctx, renderOptions) {
    var pixels = config.pixels;
    var blur = config.blur;
    var contrast = Math.floor((config.contrast || 0) * 255);

    var opacity = renderOptions.opacity;

    if (!pixels) return;

    p.push();

    if (opacity) ctx.globalAlpha = opacity;

    ctx.drawImage(pixels.canvas, 0, 0, pixels.width, pixels.height);

    p.loadPixels();

    var src = p.pixels; // pixels.values
    var trg = p.pixels;

    // console.log('copying', src.length, 'pixels to', pixels.length, 'pixels');
    for (var i = 0; i < src.length; i += 4) {

        trg[i] = src[i] - contrast ;
        trg[i+1] = src[i+1] - contrast ;
        trg[i+2] = src[i+2] - contrast;
        trg[i+3] = src[i+3]/*  * opacity */;

        //trg[i] = src[i];
    }
    p.updatePixels();
    if (blur) { p.filter(p.BLUR, blur); }

    p.pop();

}