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CanvasLite.js
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CanvasLite.js
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/**
* CanvasLite
* an html canvas implementation in pure JavaScript
*
* @version 0.9.92r2 (2023-08-02 12:49:06)
* https://github.com/foo123/CanvasLite
*
**//**
* CanvasLite
* an html canvas implementation in pure JavaScript
*
* @version 0.9.92r2 (2023-08-02 12:49:06)
* https://github.com/foo123/CanvasLite
*
**/
!function(root, name, factory) {
"use strict";
if (('object' === typeof module) && module.exports) /* CommonJS */
module.exports = factory.call(root);
else if (('function' === typeof define) && define.amd && ('function' === typeof require) && ('function' === typeof require.specified) && require.specified(name) /*&& !require.defined(name)*/) /* AMD */
define(name, ['module'], function(module) {return factory.call(root);});
else if (!(name in root)) /* Browser/WebWorker/.. */
(root[name] = factory.call(root)||1) && ('function' === typeof(define)) && define.amd && define(function() {return root[name];});
}( /* current root */ 'undefined' !== typeof self ? self : this,
/* module name */ "CanvasLite",
/* module factory */ function ModuleFactory__CanvasLite(undef) {
"use strict";
var PROTO = 'prototype',
def = Object.defineProperty,
HAS = Object[PROTO].hasOwnProperty,
toString = Object[PROTO].toString,
isNode = ("undefined" !== typeof global) && ("[object global]" === toString.call(global)),
isBrowser = ("undefined" !== typeof window) && ("[object Window]" === toString.call(window)),
stdMath = Math, INF = Infinity, sqrt2 = stdMath.sqrt(2),
is_nan = isNaN, is_finite = isFinite,
PI = stdMath.PI, TWO_PI = 2*PI, HALF_PI = PI/2,
NUM_POINTS = 6, MIN_LEN = sqrt2, PIXEL_SIZE = 0.5, EPS = 1e-6,
ImArray = 'undefined' !== typeof Uint8ClampedArray ? Uint8ClampedArray : ('undefined' !== typeof Uint8Array ? Uint8Array : Array),
BLANK = [0, 0, 0, 0],
COMMAND = /[MLHVCSQTAZ]/gi,
NUMBER = /-?(?:(?:\d+\.\d+)|(?:\.\d+)|(?:\d+))/g
;
/**
* Rasterizer
* rasterize, stroke and fill lines, rectangles, curves and paths
*
* @version 0.9.92
* https://github.com/foo123/Rasterizer
*
**/
function Rasterizer(width, height, set_rgba_at, get_rgba_from)
{
var self = this, ctx2D;
if (!(self instanceof Rasterizer)) return new Rasterizer(width, height, set_rgba_at, get_rgba_from);
get_rgba_from = get_rgba_from || (set_rgba_at && set_rgba_at.$target ? Rasterizer.getRGBAFrom(set_rgba_at.$target) : function(x, y) {return BLANK;});
ctx2D = new RenderingContext2D(width, height, set_rgba_at, get_rgba_from);
def(self, 'width', {
get: function() {
return width;
},
set: function(w) {
}
});
def(self, 'height', {
get: function() {
return height;
},
set: function(h) {
}
});
self.getContext = function(type) {
if ('2d' === type) return ctx2D;
err('Unsupported context "'+type+'"');
};
self.dispose = function() {
if (ctx2D) ctx2D.dispose();
ctx2D = null;
};
}
Rasterizer.VERSION = '0.9.92';
Rasterizer[PROTO] = {
constructor: Rasterizer,
dispose: null,
width: null,
height: null,
getContext: null
};
Rasterizer.getRGBAFrom = function(source) {
if ('function' === typeof source)
{
return function(x, y) {
var c = source(x, y);
return [c[0], c[1], c[2], 3 < c.length ? c[3]/255 : 1.0];
};
}
else if (source.data && null != source.width && null != source.height)
{
return function(x, y) {
var w = source.width, h = source.height, data = source.data, index;
if (0 <= x && x < w && 0 <= y && y < h)
{
index = (x + w*y) << 2;
return [
data[index ],
data[index+1],
data[index+2],
data[index+3]/255
];
}
return BLANK;
};
}
else
{
var c = [source[0] || 0, source[1] || 0, source[2] || 0, 3 < source.length ? (source[3] || 0) : 1.0];
return function(x, y) {
return c;
};
}
};
Rasterizer.setRGBATo = function(target) {
if ('function' === typeof target)
{
return target;
}
else
{
var setter = function(x, y, r, g, b, af, op) {
var w = target.width, h = target.height, data = target.data;
if (0 <= x && x < w && 0 <= y && y < h /*&& 0 < af*/)
{
var index = (x + w*y) << 2,
r0 = data[index ] || 0,
g0 = data[index+1] || 0,
b0 = data[index+2] || 0,
a0 = (data[index+3] || 0)/255,
a1 = af, f = null,
ro = 0, go = 0,
bo = 0, ao = 0;
op = op || 'source-over';
if ('clear' !== op && 'copy' !== op)
{
f = RenderingContext2D.CompositionMode[op];
if (!f)
{
op = 'source-over';
f = RenderingContext2D.CompositionMode[op];
}
}
switch(op)
{
case 'clear':
f = null;
break;
case 'copy':
ro = r;
go = g;
bo = b;
ao = clamp(stdMath.round(255*a1), 0, 255);
f = null;
break;
case 'xor':
case 'destination-out':
case 'destination-in':
case 'destination-atop':
case 'destination-over':
case 'source-out':
case 'source-in':
case 'source-atop':
case 'source-over':
// alpha for these modes
ao = f(a0, a0, a1, a1);
break;
default:
// alpha for other modes
ao = a1 + a0 - a1*a0;
break;
}
if (f)
{
if (0 < ao)
{
ro = clamp(stdMath.round(255*f(a0*r0/255, a0, a1*r/255, a1)/ao), 0, 255);
go = clamp(stdMath.round(255*f(a0*g0/255, a0, a1*g/255, a1)/ao), 0, 255);
bo = clamp(stdMath.round(255*f(a0*b0/255, a0, a1*b/255, a1)/ao), 0, 255);
ao = clamp(stdMath.round(255*ao), 0, 255);
}
else
{
ro = 0;
go = 0;
bo = 0;
ao = 0;
}
}
data[index ] = ro;
data[index+1] = go;
data[index+2] = bo;
data[index+3] = ao;
}
};
setter.$target = target;
return setter;
}
};
function RenderingContext2D(width, height, set_rgba_at, get_rgba_from)
{
var self = this, get_stroke_at, get_fill_at,
canvas = null, clip_canvas = null,
canvas_reset, canvas_output, stack,
reset, fill, set_pixel,
stroke_pixel, fill_pixel,
get_data, set_data,
lineCap, lineJoin, miterLimit,
lineWidth, lineDash, lineDashOffset,
transform, alpha, op, currentPath;
canvas_reset = function canvas_reset() {
// sparse array/hash
canvas = {};
};
canvas_output = function canvas_output(set_pixel) {
for (var idx in canvas)
{
var i = canvas[idx], xy = /*+idx*/idx.split(',');
set_pixel(/*xy % width*/+xy[0], /*~~(xy / width)*/+xy[1], i);
}
canvas = null;
};
set_pixel = function set_pixel(x, y, i) {
if (0 <= x && x < width && 0 <= y && y < height && 0 < i && 0 < alpha)
{
var idx = String(x)+','+String(y)/*String(x + y*width)*/,
j = canvas[idx] || 0,
m = clip_canvas ? (clip_canvas[idx] || 0) : 1;
i *= alpha*m;
if (i > j) canvas[idx] = i;
}
};
stroke_pixel = function stroke_pixel(x, y, i) {
var c = 'clear' === op ? BLANK : get_stroke_at(x, y), af = 3 < c.length ? c[3] : 1.0;
set_rgba_at(x, y, c[0], c[1], c[2], af*i, op);
};
fill_pixel = function fill_pixel(x, y, i) {
var c = 'clear' === op ? BLANK : get_fill_at(x, y), af = 3 < c.length ? c[3] : 1.0;
set_rgba_at(x, y, c[0], c[1], c[2], af*i, op);
};
reset = function(init) {
get_stroke_at = Rasterizer.getRGBAFrom([0, 0, 0, 1]);
get_fill_at = Rasterizer.getRGBAFrom([0, 0, 0, 1]);
canvas = null;
clip_canvas = null;
lineCap = 'butt';
lineJoin = 'miter';
miterLimit = 10.0;
lineWidth = 1;
lineDash = [];
lineDashOffset = 0;
transform = Matrix2D.EYE();
alpha = 1.0;
op = 'source-over';
stack = [];
currentPath = new Path2D(transform);
if (!init) self.clearRect(0, 0, width, height);
};
def(self, 'strokeStyle', {
get: function() {
return '';
},
set: function(c) {
if (c instanceof Gradient || c instanceof Pattern)
{
get_stroke_at = c.getColorAt.bind(c);
}
else
{
get_stroke_at = Rasterizer.getRGBAFrom((c.substr && c.split ? parseColor(c) : c) || BLANK);
}
}
});
def(self, 'fillStyle', {
get: function() {
return '';
},
set: function(c) {
if (c instanceof Gradient || c instanceof Pattern)
{
get_fill_at = c.getColorAt.bind(c);
}
else
{
get_fill_at = Rasterizer.getRGBAFrom((c.substr && c.split ? parseColor(c) : c) || BLANK);
}
}
});
def(self, 'lineWidth', {
get: function() {
return lineWidth;
},
set: function(lw) {
lw = +lw;
if (!is_nan(lw) && is_finite(lw) && (0 < lw))
{
lineWidth = lw;
}
}
});
def(self, 'lineCap', {
get: function() {
return lineCap;
},
set: function(lc) {
lc = String(lc).toLowerCase();
if (-1 !== ['butt','square','round'].indexOf(lc))
{
lineCap = lc;
}
}
});
def(self, 'lineJoin', {
get: function() {
return lineJoin;
},
set: function(lj) {
lj = String(lj).toLowerCase();
if (-1 !== ['miter','bevel','round'].indexOf(lj))
{
lineJoin = lj;
}
}
});
def(self, 'miterLimit', {
get: function() {
return miterLimit;
},
set: function(ml) {
ml = +ml;
if (!is_nan(ml) && is_finite(ml) && (0 <= ml))
{
miterLimit = ml;
}
}
});
def(self, 'lineDashOffset', {
get: function() {
return lineDashOffset;
},
set: function(ldo) {
ldo = +ldo;
if (!is_nan(ldo) && is_finite(ldo))
{
lineDashOffset = ldo;
}
}
});
def(self, 'lineDash', {
get: function() {
return lineDash.slice();
},
set: function(ld) {
ld = [].concat(ld);
if (ld.length & 1) ld = ld.concat(ld);
lineDash = ld;
}
});
self.getLineDash = function() {
return self.lineDash;
};
self.setLineDash = function(ld) {
self.lineDash = ld;
};
def(self, 'globalAlpha', {
get: function() {
return alpha;
},
set: function(a) {
a = +a;
if (!is_nan(a) && (0 <= a && a <= 1))
{
alpha = a;
}
}
});
def(self, 'globalCompositeOperation', {
get: function() {
return op;
},
set: function(o) {
op = String(o);
}
});
self.save = function() {
if (!stack) stack = [];
stack.push([
get_stroke_at,
get_fill_at,
clip_canvas,
lineCap,
lineJoin,
miterLimit,
lineWidth,
lineDash,
lineDashOffset,
transform,
alpha,
op
]);
};
self.restore = function() {
if (!stack || !stack.length) return;
var state = stack.pop();
get_stroke_at = state[0];
get_fill_at = state[1];
clip_canvas = state[2];
lineCap = state[3];
lineJoin = state[4];
miterLimit = state[5];
lineWidth = state[6];
lineDash = state[7];
lineDashOffset = state[8];
currentPath.transform = transform = state[9];
alpha = state[10];
op = state[11];
};
self.reset = function() {
reset();
};
self.scale = function(sx, sy) {
currentPath.transform = transform = transform.mul(Matrix2D.scale(sx, sy));
};
self.rotate = function(angle) {
currentPath.transform = transform = transform.mul(Matrix2D.rotate(angle || 0));
};
self.translate = function(tx, ty) {
currentPath.transform = transform = transform.mul(Matrix2D.translate(tx || 0, ty || 0));
};
self.transform = function(a, b, c, d, e, f) {
currentPath.transform = transform = transform.mul(new Matrix2D(a, c, e, b, d, f));
};
self.getTransform = function() {
return transform.clone();
};
self.setTransform = function(a, b, c, d, e, f) {
if (1 < arguments.length)
{
transform = new Matrix2D(a, c, e, b, d, f);
}
else if (a && (null != a.a) && (null != a.f))
{
transform = new Matrix2D(a.a, a.c, a.e, a.b, a.d, a.f);
}
currentPath.transform = transform;
};
self.resetTransform = function() {
currentPath.transform = transform = Matrix2D.EYE();
};
self.beginPath = function() {
currentPath = new Path2D(transform);
};
self.closePath = function() {
currentPath.closePath();
};
self.moveTo = function(x, y) {
currentPath.moveTo(x, y);
};
self.lineTo = function(x, y) {
currentPath.lineTo(x, y);
};
self.rect = function(x, y, w, h) {
currentPath.rect(x, y, w, h);
};
self.roundRect = function(x, y, w, h) {
currentPath.roundRect.apply(currentPath, arguments);
};
self.arc = function(cx, cy, r, start, end, ccw) {
currentPath.arc(cx, cy, r, start, end, ccw);
};
self.ellipse = function(cx, cy, rx, ry, angle, start, end, ccw) {
currentPath.ellipse(cx, cy, rx, ry, angle, start, end, ccw);
};
self.arcTo = function(x1, y1, x2, y2, r) {
currentPath.arcTo(x1, y1, x2, y2, r);
};
self.quadraticCurveTo = function(x1, y1, x2, y2) {
currentPath.quadraticCurveTo(x1, y1, x2, y2);
};
self.bezierCurveTo = function(x1, y1, x2, y2, x3, y3) {
currentPath.bezierCurveTo(x1, y1, x2, y2, x3, y3);
};
self.clearRect = function(x, y, w, h) {
var o = op, a = alpha;
op = 'clear';
alpha = 1.0;
self.fill((new Path2D(transform)).rect(x, y, w, h), 'evenodd');
op = o;
alpha = a;
};
self.strokeRect = function(x, y, w, h) {
if (0 < lineWidth) self.stroke((new Path2D(transform)).rect(x, y, w, h));
};
self.fillRect = function(x, y, w, h) {
self.fill((new Path2D(transform)).rect(x, y, w, h), 'evenodd');
};
self.stroke = function(path) {
if (0 < lineWidth)
{
path = path || currentPath;
var t = path.transform,
sx = stdMath.abs(t.sx),
sy = stdMath.abs(t.sy);
/*if (!t.isIdentity)
{
sx = hypot(t.m11, t.m21);
sy = hypot(-t.m12, t.m22);
}*/
canvas_reset();
stroke_path(set_pixel, path, lineWidth, lineDash, lineDashOffset, lineCap, lineJoin, miterLimit, sx, sy, 0, 0, width - 1, height - 1);
canvas_output(stroke_pixel);
}
};
fill = function(path, fillRule) {
var lw = 0.5/*0.65*/,
xmin = 0,
ymin = 0,
xmax = width - 1,
ymax = height - 1;
// stroke thin path outline
stroke_path(set_pixel, path, lw, [], 0, 'butt', 'bevel', 0, 1, 1, xmin, ymin, xmax, ymax);
// fill path interior
fill_path(set_pixel, path, fillRule, xmin, ymin, xmax, ymax);
};
self.fill = function(path, fillRule) {
if (!arguments.length || (null == path && null == fillRule))
{
path = currentPath;
fillRule = 'nonzero';
}
else if (1 === arguments.length || null == fillRule)
{
if (path instanceof Path2D)
{
fillRule = 'nonzero';
}
else
{
fillRule = path;
path = currentPath;
}
}
fillRule = String(fillRule || 'nonzero').toLowerCase();
if ('evenodd' !== fillRule) fillRule = 'nonzero';
path = path || currentPath;
canvas_reset();
fill(path, fillRule);
canvas_output(fill_pixel);
};
self.clip = function(path, fillRule) {
if (!arguments.length || (null == path && null == fillRule))
{
path = currentPath;
fillRule = 'nonzero';
}
else if (1 === arguments.length || null == fillRule)
{
if (path instanceof Path2D)
{
fillRule = 'nonzero';
}
else
{
fillRule = path;
path = currentPath;
}
}
fillRule = String(fillRule || 'nonzero').toLowerCase();
if ('evenodd' !== fillRule) fillRule = 'nonzero';
path = path || currentPath;
if (path === currentPath) currentPath = new Path2D(transform);
canvas_reset();
fill(path, fillRule);
clip_canvas = canvas;
canvas = null;
};
self.isPointInStroke = function(path, x, y) {
if (3 > arguments.length)
{
y = x;
x = path;
path = currentPath;
}
return point_in_stroke(x || 0, y || 0, path || currentPath);
};
self.isPointInPath = function(path, x, y, fillRule) {
if (!(path instanceof Path2D))
{
fillRule = y;
y = x;
x = path;
path = currentPath;
}
fillRule = String(fillRule || 'nonzero').toLowerCase();
if ('evenodd' !== fillRule) fillRule = 'nonzero';
return point_in_path(x || 0, y || 0, path || currentPath, fillRule);
};
get_data = function(D, W, H, x0, y0, x1, y1) {
x0 = stdMath.min(x0, W-1); y0 = stdMath.min(y0, H-1);
x1 = stdMath.min(x1, W-1); y1 = stdMath.min(y1, H-1);
if ((x1 < x0) || (y1 < y0)) return new ImArray(0);
var c, x, y, i, I, w = x1-x0+1, h = y1-y0+1, size = (w*h) << 2, d = new ImArray(size);
if (D)
{
for(x=x0,y=y0,i=0; y<=y1; i+=4,++x)
{
if (x>x1) {x=x0; ++y;}
I = (y*W + x) << 2;
d[i ] = D[I ];
d[i+1] = D[I+1];
d[i+2] = D[I+2];
d[i+3] = D[I+3];
}
}
else
{
for(x=x0,y=y0,i=0; y<=y1; i+=4,++x)
{
if (x>x1) {x=x0; ++y;}
c = get_rgba_from(x, y);
d[i ] = clamp(c[0], 0, 255);
d[i+1] = clamp(c[1], 0, 255);
d[i+2] = clamp(c[2], 0, 255);
d[i+3] = clamp(stdMath.round(c[3]*255), 0, 255);
}
}
return d;
};
set_data = function(D, W, H, d, w, h, x0, y0, x1, y1, X0, Y0) {
var i, I, x, y;
//if (!D.length || !d.length || !w || !h || !W || !H) return;
x0 = stdMath.min(x0, w-1); y0 = stdMath.min(y0, h-1);
X0 = stdMath.min(X0, W-1); Y0 = stdMath.min(Y0, H-1);
x1 = stdMath.min(x1, w-1); y1 = stdMath.min(y1, h-1);
X0 -= x0; Y0 -= y0;
for(x=x0,y=y0; y<=y1; ++x)
{
if (x>x1) {x=x0; ++y;}
if ((y+Y0 >= H) || (x+X0 >= W)) continue;
i = (y*w + x) << 2;
/*I = ((y+Y0)*W + x+X0) << 2;
D[I ] = d[i ];
D[I+1] = d[i+1];
D[I+2] = d[i+2];
D[I+3] = d[i+3];*/
set_rgba_at(x+X0, y+Y0, d[i ], d[i+1], d[i+2], d[i+3]/255, 'copy');
}
};
self.drawImage = function(imgData, sx, sy, sw, sh, dx, dy, dw, dh) {
if (imgData instanceof CanvasLite) imgData = imgData.getContext('2d').getImageData(0, 0, imgData.width, imgData.height);
if (imgData && ('function' === typeof imgData.getImageData)) imgData = imgData.getImageData();
if (!imgData || !imgData.data) err('Invalid image data in drawImage');
var W = width, H = height,
w = imgData.width, h = imgData.height,
idata = imgData.data,
resize = RenderingContext2D.Interpolation['default'],
argslen = arguments.length
;
if (!w || !h) err('Invalid image data in drawImage');
sx = sx || 0;
sy = sy || 0;
if (3 === argslen)
{
dx = sx; dy = sy;
set_data(null, W, H, idata, w, h, 0, 0, w-1, h-1, dx, dy);
}
else if (5 === argslen)
{
dx = sx; dy = sy;
dw = sw; dh = sh;
if ((w === dw) && (h === dh))
set_data(null, W, H, idata, dw, dh, 0, 0, dw-1, dh-1, dx, dy);
else
set_data(null, W, H, resize(idata, w, h, dw, dh), dw, dh, 0, 0, dw-1, dh-1, dx, dy);
}
else
{
if ((sw === dw) && (sh === dh))
set_data(null, W, H, get_data(idata, w, h, sx, sy, sx+sw-1, sy+sh-1), dw, dh, 0, 0, dw-1, dh-1, dx, dy);
else
set_data(null, W, H, resize(get_data(idata, w, h, sx, sy, sx+sw-1, sy+sh-1), sw, sh, dw, dh), dw, dh, 0, 0, dw-1, dh-1, dx, dy);
}
};
self.getImageData = function(x, y, w, h) {
var W = width, H = height, x1, y1, x2, y2;
if (null == x) x = 0;
if (null == y) y = 0;
if (null == w) w = W;
if (null == h) h = H;
x1 = stdMath.max(0, stdMath.min(x, w-1, W-1));
y1 = stdMath.max(0, stdMath.min(y, h-1, H-1));
x2 = stdMath.min(x1+w-1, w-1, W-1);
y2 = stdMath.min(y1+h-1, h-1, H-1);
return {data: get_data(null, W, H, x1, y1, x2, y2), width: x2-x1+1, height: y2-y1+1};
};
self.putImageData = function(imgData, x, y) {
if (!imgData || !imgData.data) err('Invalid image data in putImageData');
var W = width, H = height, w = imgData.width, h = imgData.height;
if (null == x) x = 0;
if (null == y) y = 0;
set_data(null, W, H, imgData.data, w, h, 0, 0, w-1, h-1, x, y);
};
self.dispose = function() {
get_stroke_at = NOOP;
get_fill_at = NOOP;
canvas = null;
clip_canvas = null;
lineCap = 'butt';
lineJoin = 'miter';
miterLimit = 10.0;
lineWidth = 1;
lineDash = null;
lineDashOffset = 0;
transform = null;
alpha = 1.0;
op = 'source-over';
stack = null;
currentPath = null;
};
reset(true);
}
RenderingContext2D[PROTO] = {
constructor: RenderingContext2D,
dispose: null,
strokeStyle: null,
fillStyle: null,
lineWidth: null,
lineCap: null,
lineJoin: null,
miterLimit: null,
lineDash: null,
lineDashOffset: null,
getLineDash: null,
setLineDash: null,
globalAlpha: null,
globalCompositeOperation: null,
save: null,
restore: null,
reset: null,
scale: null,
rotate: null,
translate: null,
transform: null,
getTransform: null,
setTransform: null,
resetTransform: null,
beginPath: null,
closePath: null,
moveTo: null,
lineTo: null,
rect: null,
arc: null,
ellipse: null,
arcTo: null,
quadraticCurveTo: null,
bezierCurveTo: null,
clearRect: null,
strokeRect: null,
fillRect: null,
stroke: null,
fill: null,
clip: null,
isPointInStroke: null,
isPointInPath: null,
createImageData: function(width, height) {
if (null == height && null != width.width && null != width.height)
{
height = width.height;
width = width.width;
}
return {
data: new ImArray((width*height) << 2),
width: width,
height: height
};
},
getImageData: null,
putImageData: null,
drawImage: null,
// handled through Gradient.js for example
createLinearGradient: NOOP,
createRadialGradient: NOOP,
createConicGradient: NOOP,
createPattern: NOOP,
// NOT implemented
strokeText: NOOP,
fillText: NOOP,
measureText: NOOP
};
Rasterizer.RenderingContext2D = RenderingContext2D;
RenderingContext2D.CompositionMode = {
//https://graphics.pixar.com/library/Compositing/paper.pdf
'xor': function(Dca, Da, Sca, Sa){return Sca * (1 - Da) + Dca * (1 - Sa);},
'destination-out': function(Dca, Da, Sca, Sa){return Dca * (1 - Sa);},
'destination-in': function(Dca, Da, Sca, Sa){return Dca * Sa;},
'destination-atop': function(Dca, Da, Sca, Sa){return Sca * (1 - Da) + Dca * Sa;},
'destination-over': function(Dca, Da, Sca, Sa){return Sca * (1 - Da) + Dca;},
'source-out': function(Dca, Da, Sca, Sa){return Sca * (1 - Da);},
'source-in': function(Dca, Da, Sca, Sa){return Sca * Da;},
'source-atop': function(Dca, Da, Sca, Sa){return Sca * Da + Dca * (1 - Sa);},
'source-over': function(Dca, Da, Sca, Sa){return Sca + Dca * (1 - Sa);},
//https://dev.w3.org/SVG/modules/compositing/master/
'multiply': function(Dca, Da, Sca, Sa){return Sca*Dca + Sca*(1 - Da) + Dca*(1 - Sa);},
'screen': function(Dca, Da, Sca, Sa){return Sca + Dca - Sca * Dca;},
'overlay': function(Dca, Da, Sca, Sa){return 2*Dca <= Da ? (2*Sca * Dca + Sca * (1 - Da) + Dca * (1 - Sa)) : (Sca * (1 + Da) + Dca * (1 + Sa) - 2 * Dca * Sca - Da * Sa);},
'darken': function(Dca, Da, Sca, Sa){return stdMath.min(Sca * Da, Dca * Sa) + Sca * (1 - Da) + Dca * (1 - Sa);},
'lighten': function(Dca, Da, Sca, Sa){return stdMath.max(Sca * Da, Dca * Sa) + Sca * (1 - Da) + Dca * (1 - Sa);},
'color-dodge': function(Dca, Da, Sca, Sa){return Sca === Sa && 0 === Dca ? (Sca * (1 - Da)) : (Sca === Sa ? (Sa * Da + Sca * (1 - Da) + Dca * (1 - Sa)) : (Sa * Da * stdMath.min(1, Dca/Da * Sa/(Sa - Sca)) + Sca * (1 - Da) + Dca * (1 - Sa)));},
'color-burn': function(Dca, Da, Sca, Sa){var m = Da ? Dca/Da : 0; return 0 === Sca && Dca === Da ? (Sa * Da + Dca * (1 - Sa)) : (0 === Sca ? (Dca * (1 - Sa)) : (Sa * Da * (1 - stdMath.min(1, (1 - m) * Sa/Sca)) + Sca * (1 - Da) + Dca * (1 - Sa)));},
'hard-light': function(Dca, Da, Sca, Sa){return 2 * Sca <= Sa ? (2 * Sca * Dca + Sca * (1 - Da) + Dca * (1 - Sa)) : (Sca * (1 + Da) + Dca * (1 + Sa) - Sa * Da - 2 * Sca * Dca);},
'soft-light': function(Dca, Da, Sca, Sa){var m = Da ? Dca/Da : 0; return 2 * Sca <= Sa ? (Dca * (Sa + (2 * Sca - Sa) * (1 - m)) + Sca * (1 - Da) + Dca * (1 - Sa)) : (2 * Sca > Sa && 4 * Dca <= Da ? (Da * (2 * Sca - Sa) * (16 * stdMath.pow(m, 3) - 12 * stdMath.pow(m, 2) - 3 * m) + Sca - Sca * Da + Dca) : (Da * (2 * Sca - Sa) * (stdMath.pow(m, 0.5) - m) + Sca - Sca * Da + Dca));},
'difference': function(Dca, Da, Sca, Sa){return Sca + Dca - 2 * stdMath.min(Sca * Da, Dca * Sa);},
'exclusion': function(Dca, Da, Sca, Sa){return (Sca * Da + Dca * Sa - 2 * Sca * Dca) + Sca * (1 - Da) + Dca * (1 - Sa);}
};
RenderingContext2D.CompositionMode['hardlight'] = RenderingContext2D.CompositionMode['hard-light'];
RenderingContext2D.CompositionMode['softlight'] = RenderingContext2D.CompositionMode['soft-light'];
RenderingContext2D.Interpolation = {
'bilinear': function(im, w, h, nw, nh) {
// http://pixinsight.com/doc/docs/InterpolationAlgorithms/InterpolationAlgorithms.html
// http://tech-algorithm.com/articles/bilinear-image-scaling/
var size = (nw*nh) << 2,
interpolated = new ImArray(size),
rx = (w-1)/nw, ry = (h-1)/nh,
A, B, C, D, a, b, c, d,
i, j, x, y, xi, yi, pixel, index,
yw, dx, dy, w4 = w << 2
;
i=0; j=0; x=0; y=0; yi=0; yw=0; dy=0;
for (index=0; index<size; index+=4,++j,x+=rx)
{
if (j >= nw) {j=0; x=0; ++i; y+=ry; yi=y|0; dy=y - yi; yw=yi*w;}
xi = x|0; dx = x - xi;
// Y = A(1-w)(1-h) + B(w)(1-h) + C(h)(1-w) + Dwh
a = (1-dx)*(1-dy); b = dx*(1-dy);
c = dy*(1-dx); d = dx*dy;
pixel = (yw + xi)<<2;
A = im[pixel]; B = im[pixel+4];
C = im[pixel+w4]; D = im[pixel+w4+4];
interpolated[index] = clamp(stdMath.round(A*a + B*b + C*c + D*d), 0, 255);
A = im[pixel+1]; B = im[pixel+5];
C = im[pixel+w4+1]; D = im[pixel+w4+5];
interpolated[index+1] = clamp(stdMath.round(A*a + B*b + C*c + D*d), 0, 255);
A = im[pixel+2]; B = im[pixel+6];
C = im[pixel+w4+2]; D = im[pixel+w4+6];
interpolated[index+2] = clamp(stdMath.round(A*a + B*b + C*c + D*d), 0, 255);
A = im[pixel+3]; B = im[pixel+7];
C = im[pixel+w4+3]; D = im[pixel+w4+7];
interpolated[index+3] = clamp(stdMath.round(A*a + B*b + C*c + D*d), 0, 255);
}
return interpolated;
}
};
RenderingContext2D.Interpolation['default'] = RenderingContext2D.Interpolation['bilinear'];
function Path2D(path, transform)
{
var self = this, need_new_subpath = true, d = [], sd = null, add_path;
def(self, 'transform', {
get: function() {
return transform.clone();
},
set: function(t) {
transform = t;
}
});
def(self, '_d', {
get: function() {
return d;
},
set: function(_d) {
}
});
def(self, '_sd', {
get: function() {
if (!sd) sd = path_to_segments(d);
return sd;
},
set: function(_sd) {
}
});
self.moveTo = function(x, y) {
var xy = handle([x, y], transform);
if (!xy) return self;
d.push(xy);
need_new_subpath = false;
return self;
};
self.closePath = function() {
if (d.length && 2 < d[d.length-1].length)
{
var x0 = +d[d.length-1][0],
y0 = d[d.length-1][1],
x2 = +d[d.length-1][2],
y2 = d[d.length-1][3],
x1 = +d[d.length-1][d[d.length-1].length-2],
y1 = d[d.length-1][d[d.length-1].length-1]
;
if (!(is_almost_equal(x0, x1, 1e-6) && is_almost_equal(y0, y1, 1e-6)))
{
d[d.length-1].push(new Marker(x0, {join:[x2, y2]}), y0);
}
else
{
d[d.length-1][d[d.length-1].length-2] = new Marker(x1, {join:[x2, y2]});
}
d.push([x0, y0]);
need_new_subpath = false;
sd = null;
}
return self;
};
self.lineTo = function(x, y) {
var xy = handle([x, y], transform);
if (!xy) return self;
if (need_new_subpath)
{
d.push(xy);
need_new_subpath = false;
}
else
{
d[d.length-1].push(xy[0], xy[1]);
sd = null;
}
return self;
};
self.rect = function(x, y, w, h) {
var p = handle([
x, y,
x + w, y,
x + w, y + h,
x, y + h
], transform);
if (!p) return self;
p[0] = new Marker(+p[0], {lineCap:'butt', lineJoin:'miter'});
if (d.length && 2 >= d[d.length-1].length)
{
d[d.length-1] = p;
}
else
{
d.push(p);
}
sd = null;
return self.closePath();
};
self.roundRect = function(x, y, w, h/*,..*/) {
var p = handle([
x, y, w, h
]);
if (!p) return self;
var radii = (arguments[4] && arguments[4].push ? arguments[4] : [].slice.call(arguments, 4)).filter(function(r) {return 0 < r;});
if (1 > radii.length || 4 < radii.length) err('Invalid radii in roundRect');
var upperLeft, upperRight, lowerRight, lowerLeft, t;
if (4 === radii.length)
{
upperLeft = radii[0];
upperRight = radii[1];
lowerRight = radii[2];
lowerLeft = radii[3];
}
else if (3 === radii.length)
{
upperLeft = radii[0];
upperRight = radii[1];
lowerLeft = radii[1];
lowerRight = radii[2];
}
else if (2 === radii.length)
{
upperLeft = radii[0];