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function CanvasEffect(canvas) {
var ctx = canvas.getContext("2d");
var WIDTH = canvas.width;
var HEIGHT = canvas.height;
var stack = [];
var imageData;
var data;
this.apply = function(effect, intensity) {
if(data == undefined) {
imageData = ctx.getImageData(0,0, WIDTH, HEIGHT);
var imgData = imageData.data;
// Save the data of the orignal file.
data= new Int32Array(imgData);
}
var int = Number(intensity);
var refresh = true;
switch (effect) {
case "blur":
refresh = false;
stackBlurCanvasRGB('canvas', 0, 0, WIDTH, HEIGHT, int);
break;
case "sharpen":
break;
case "luminosity":
console.log("stack['luminosity'] : " + stack["luminosity"]);
lastInt = (stack["luminosity"] == undefined) ? 0 : stack["luminosity"];
newInt = int - lastInt;
console.log("int : " + int, "lastInt : " + lastInt, "newInt : " + newInt);
for(var i=0;i < data.length;i+=4) {
data[i] += newInt; //Red
data[i+1] += newInt; //Green
data[i+2] += newInt; //Blue
}
break;
case "contrast":
lastInt = (stack["contrast"] == undefined) ? 0 : stack["contrast"];
newInt = int - lastInt;
var factor = (259 * (newInt + 255)) / (255 * (259 - newInt));
for(var i = 0; i < data.length ; i+=4) {
data[i] = factor * (data[i] - 128) + 128; //Red
data[i+1] = factor * (data[i+1] - 128) + 128; //Green
data[i+2] = factor * (data[i+2] - 128) + 128; //Blue
}
break;
case "negatif":
console.log("negatif");
for(var i=0;i < data.length;i+=4) {
data[i] = 256-data[i]; //Red
data[i+1] = 256-data[i+1]; //Green
data[i+2] = 256 - data[i+2]; //Blue
}
break;
case "b&w":
console.log("b&w");
for(var i=0;i < data.length;i+=4) {
var gris = data[i]*0.3 + data[i+1]*0.59 + data[i+2]*0.11;
data[i] = gris; //Red
data[i+1] = gris; //Green
data[i+2] = gris; //Blue
}
break;
case "sepia":
console.log("sepia");
for(var i=0;i < data.length;i+=4) {
var r = data[i]*0.299 + data[i+1]*0.587 + data[i+2]*0.114;
data[i] = Math.max(0, Math.min(255, r*1.351)); //Red
data[i+1] = Math.max(0, Math.min(255, r*1.203)); //Green
data[i+2] = Math.max(0, Math.min(255, r*0.937)); //Blue
}
break;
default:
break;
}
if(refresh) {
// Voici le code qui ne fonctionne pas
var clampedArray = new Uint8ClampedArray(data); // Conversion vers un Uint8ClampedArray.
var newImgData=ctx.createImageData( WIDTH, HEIGHT);
newImgData.data = clampedArray;
console.log(newImgData.data, clampedArray);
ctx.putImageData(newImgData,0 ,0);
console.log(imgData.data);
}
stack[effect] = int;
};
} |
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