mirror of
https://github.com/flynx/ImageGrid.git
synced 2025-10-30 10:50:08 +00:00
473 lines
11 KiB
JavaScript
473 lines
11 KiB
JavaScript
//---------------------------------------------------------------------
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//
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//
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// XXX still thinking on how to package this correctly...
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//
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//---------------------------------------------------------------------
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// image manipulation basics...
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var Filters = {
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makeCanvas: function(w, h){
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var c = document.createElement('canvas')
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c.width = w
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c.height = h
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return c
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},
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// as input takes an HTML Image object...
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getPixels: function(img, w, h){
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var w = w || img.width
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var h = h || img.height
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var c = this.makeCanvas(w, h)
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var context = c.getContext('2d')
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if(img == null){
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context.rect(0, 0, w, h)
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context.fillStyle = "black"
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context.fill()
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} else {
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context.drawImage(img, 0, 0, w, h)
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}
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return context.getImageData(0,0,c.width,c.height)
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},
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setPixels: function(c, data, w, h){
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c.width = data.width
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c.height = data.height
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var context = c.getContext('2d')
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context.putImageData(data, 0, 0)
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},
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filterImage: function(filter, image, var_args){
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var args = [this.getPixels(image)]
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for(var i=2; i<arguments.length; i++){
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args.push(arguments[i])
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}
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return filter.apply(null, args)
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},
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grayscale: function(pixels, args){
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var d = pixels.data
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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// CIE luminance for the RGB
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// The human eye is bad at seeing red and blue, so we de-emphasize them.
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var v = 0.2126*r + 0.7152*g + 0.0722*b
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d[i] = d[i+1] = d[i+2] = v
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}
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return pixels
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},
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// XXX need to resize this...
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histogram: function(pixels, mode, color){
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color = color || 'fill'
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mode = mode || 'luminance'
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var w = 255
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var h = 255
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// output buffer...
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var out = this.getPixels(null, w, h)
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// pixel hit buffer...
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var count = []
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var od = out.data
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var d = pixels.data
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// get the stats...
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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if(mode == 'luminance'){
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var v = Math.round(0.2126*r + 0.7152*g + 0.0722*b) * 4
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count[v] = count[v+1] = count[v+2] = (count[v] || 0) + 1
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} else {
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if(mode == 'color' || mode == 'R'){
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count[r*4] = (count[r*4] || 0) + 1 }
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if(mode == 'color' || mode == 'G'){
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count[g*4+1] = (count[g*4+1] || 0) + 1 }
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if(mode == 'color' || mode == 'B'){
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count[b*4+2] = (count[b*4+2] || 0) + 1 } }
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}
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var m = 255 / Math.max(...count.filter(function(){ return true }))
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var pos = function(i, value){
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return (
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// horizontal position...
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i*4
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// value vertical offset...
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+ (255-Math.round(value*m))*w*4) }
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// XXX would be nice to have an option to draw full columns...
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count.forEach(function(v, i){
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var j = pos(i/4, v)
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while(j < od.length){
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j += w*4
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od[j] = 255
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if(color == 'point'){
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// correct for blue visibility...
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mode != 'luminance'
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&& (i-2)%4 == 0
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&& (od[j-1] = od[j-2] = 180)
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break } } })
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return out
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},
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waveform: function(pixels, mode, color){
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mode = mode || 'luminance'
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color = color || 'normalized'
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var w = pixels.width
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// normalize pixel ratio...
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var m = (1/pixels.height)*255
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var offsetTop = 0
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var offsetBottom = 0
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// output buffer...
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var out = this.getPixels(null,
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w,
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offsetTop + 255 + offsetBottom)
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// pixel hit buffer...
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var count = []
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var od = out.data
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var d = pixels.data
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var pos = function(i, value){
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return (
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// top margin...
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offsetTop*w*4
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// horixontal position...
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+ i%(w*4)
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// value vertical offset...
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+ (255-Math.round(value))*w*4) }
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var gain = 100
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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var c, j, f, x, y
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if(mode == 'luminance'){
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// CIE luminance for RGB
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var v = 0.2126*r + 0.7152*g + 0.0722*b
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c = count[j = pos(i, v)] = (count[j] || 0) + m
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od[j] = od[j+1] = od[j+2] = c * gain
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} else {
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if(mode == 'color' || mode == 'R'){
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f = 0.2126
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x = 1
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y = 2
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j = pos(i, r)
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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if(mode == 'color' || mode == 'G'){
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f = 0.7152
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x = -1
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y = 1
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j = pos(i, g) + 1
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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if(mode == 'color' || mode == 'B'){
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f = 0.0722
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x = -2
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y = -1
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j = pos(i, b) + 2
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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// normalize...
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mode != 'color'
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&& (color == 'white' ?
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(od[j+x] = od[j+y] = c * gain)
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: color == 'normalized' ?
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(od[j+x] = od[j+y] = c * gain/2 * (1-f))
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: null)
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}
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}
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return out
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},
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}
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//---------------------------------------------------------------------
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// helpers...
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var WAVEFORM_SIZE = 1000
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var waveform = function(img, canvas, mode, color){
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var d = Filters.getPixels(img, WAVEFORM_SIZE)
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var w = Filters.waveform(d, mode, color)
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Filters.setPixels(canvas, w) }
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var HISTOGRAM_SIZE = 1000
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var histogram = function(img, canvas, mode, color){
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var d = Filters.getPixels(img)
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var w = Filters.histogram(d, mode, color)
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Filters.setPixels(canvas, w) }
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//---------------------------------------------------------------------
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// Custom element...
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igImageGraph_template = `
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<style>
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:host {
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position: relative;
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display: inline-block;
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background: black;
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width: attr(image-width);
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height: attr(graph-height);
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}
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:host canvas {
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box-sizing: border-box;
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width: 100%;
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height: 100%;
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border: 2px solid gray;
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}
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:host .controls {
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display: inline-block;
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position: absolute;
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top: 2px;
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right: 2px;
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left: 2px;
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}
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:host .controls button {
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background: transparent;
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border: none;
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color: white;
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opacity: 0.7;
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float: right;
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}
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:host .controls button.current {
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text-decoration: underline;
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opacity: 0.9;
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}
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:host .controls button:hover {
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opacity: 1;
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}
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</style>
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<canvas class="graph"></canvas>
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<div class="controls"></div>
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`
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class igImageGraph extends HTMLElement {
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template = 'ig-image-graph'
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graphs = {
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waveform,
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histogram,
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}
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modes = ['luminance', 'color', 'R', 'G', 'B']
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color_modes = ['normalized', 'white', 'point']
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constructor(src){
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super()
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// shadow DOM
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var shadow = this.__shadow =
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this.attachShadow({mode: 'open'})
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// get/create template...
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var tpl = document.getElementById(this.template)
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if(!tpl){
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var tpl = document.createElement('template')
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tpl.setAttribute('id', this.template)
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tpl.innerHTML = igImageGraph_template
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document.head.appendChild(tpl) }
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shadow.appendChild(tpl.content.cloneNode(true)) }
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connectedCallback(){
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this.update_controls()
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this.update() }
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// attributes...
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get observedAttributes(){
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return [
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'src',
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'mode',
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'color',
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'nocontrols',
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'graph',
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]}
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attributeChangedCallback(name, from, to){
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name == 'nocontrols'
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&& this.update_controls()
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this.update() }
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get graph(){
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return this.getAttribute('graph') || 'waveform' }
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set graph(value){
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value in this.graphs
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&& this.setAttribute('graph', value)
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value == ''
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&& this.removeAttribute('graph')
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this.update() }
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get src(){
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return this.getAttribute('src') }
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set src(value){
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var that = this
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this.__update_handler = this.__update_handler
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|| this.update.bind(this)
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var url = typeof(value) == typeof('str')
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// get/create image...
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var img = this.image =
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url ?
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(this.image || document.createElement('img'))
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: value
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img.removeEventListener('load', this.__update_handler)
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img.addEventListener('load', this.__update_handler)
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// set .src and img.src...
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this.setAttribute('src',
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url ?
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(img.src = value)
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: img.src)
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}
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get mode(){
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return this.getAttribute('mode') || 'color' }
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set mode(value){
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this.modes.includes(value)
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&& this.setAttribute('mode', value)
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value === undefined
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&& this.removeAttribute('color')
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this.update_controls()
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this.update() }
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get color(){
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return this.getAttribute('color') || 'normalized' }
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set color(value){
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this.color_modes.includes(value)
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&& this.setAttribute('color', value)
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value === undefined
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&& this.removeAttribute('color')
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this.update() }
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get nocontrols(){
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return this.getAttribute('nocontrols') != null }
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set nocontrols(value){
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value ?
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this.setAttribute('nocontrols', '')
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: this.removeAttribute('nocontrols')
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this.update_controls()
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this.update() }
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// API...
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update_controls(){
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var that = this
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var mode = this.mode
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var controls = this.__shadow.querySelector('.controls')
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controls.innerHTML = ''
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// modes...
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var buttons = [
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// graph...
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function(){
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var button = document.createElement('button')
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button.classList.add('update')
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//button.innerHTML = '◑'
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button.innerHTML = '◪'
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button.onclick = function(){
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that.graph = that.graph == 'waveform' ?
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'histogram'
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: 'waveform'
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that.update() }
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return button }(),
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// modes...
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(this.nocontrols ?
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[]
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: this.modes)
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// mode buttons...
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.map(function(m){
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var button = document.createElement('button')
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button.innerText = m
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button.classList.add(m, ...(m == mode ? ['current'] : []))
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button.onclick = function(){
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that.mode = m }
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return button }),
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/*
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// color mode switch...
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function(){
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var button = document.createElement('button')
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button.innerText = '('+ that.color[0] +')'
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button.onclick = function(){
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that.color = that.color_modes[
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(that.color_modes.indexOf(that.color) + 1)
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% that.color_modes.length]
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this.innerText = '('+ that.color[0] +')' }
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return button }(),
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//*/
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// reload...
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function(){
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var button = document.createElement('button')
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button.classList.add('update')
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button.innerHTML = '⟳'
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button.onclick = function(){ that.update() }
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return button }(),
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]
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.flat()
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.reverse()
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.forEach(function(button){
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controls.appendChild(button) })
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return this
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}
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update(){
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var that = this
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var mode = this.mode
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// controls...
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// remove...
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if(!this.nocontrols){
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var controls = this.__shadow.querySelector('.controls')
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// current button state...
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var button = controls.querySelector('button.'+this.mode)
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button
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&& button.classList.add('current')
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}
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// XXX configurable...
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var type = this.graph
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var graph = this.graphs[type]
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var canvas = this.__shadow.querySelector('canvas')
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if(this.image){
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graph(this.image, canvas, this.mode, this.color)
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} else if(this.src){
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this.src = this.src
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}
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return this
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}
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}
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window.customElements.define('ig-image-graph', igImageGraph)
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var makeImageGraph = function(img, options){
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var g = document.createElement('ig-image-graph')
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Object.assign(g,
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options || {})
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g.src = img
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return g }
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//---------------------------------------------------------------------
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// vim:set ts=4 sw=4 :
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