| // Adds JS functions to augment the CanvasKit interface. |
| // For example, if there is a wrapper around the C++ call or logic to allow |
| // chaining, it should go here. |
| (function(CanvasKit) { |
| // CanvasKit.onRuntimeInitialized is called after the WASM library has loaded. |
| // Anything that modifies an exposed class (e.g. SkPath) should be set |
| // after onRuntimeInitialized, otherwise, it can happen outside of that scope. |
| CanvasKit.onRuntimeInitialized = function() { |
| // All calls to 'this' need to go in externs.js so closure doesn't minify them away. |
| |
| |
| // Add some helpers for matrices. This is ported from SkMatrix.cpp |
| // to save complexity and overhead of going back and forth between |
| // C++ and JS layers. |
| CanvasKit.SkMatrix = {}; |
| function sdot(a, b, c, d, e, f) { |
| e = e || 0; |
| f = f || 0; |
| return a * b + c * d + e * f; |
| } |
| |
| CanvasKit.SkMatrix.identity = function() { |
| return [ |
| 1, 0, 0, |
| 0, 1, 0, |
| 0, 0, 1, |
| ]; |
| }; |
| |
| // Maps the given points according to the passed in matrix. |
| // Results are done in place. |
| // See SkMatrix.h::mapPoints for the docs on the math. |
| CanvasKit.SkMatrix.mapPoints = function(matrix, ptArr) { |
| if (ptArr.length % 2) { |
| throw 'mapPoints requires an even length arr'; |
| } |
| for (var i = 0; i < ptArr.length; i+=2) { |
| var x = ptArr[i], y = ptArr[i+1]; |
| // Gx+Hy+I |
| var denom = matrix[6]*x + matrix[7]*y + matrix[8]; |
| // Ax+By+C |
| var xTrans = matrix[0]*x + matrix[1]*y + matrix[2]; |
| // Dx+Ey+F |
| var yTrans = matrix[3]*x + matrix[4]*y + matrix[5]; |
| ptArr[i] = xTrans/denom; |
| ptArr[i+1] = yTrans/denom; |
| } |
| return ptArr; |
| }; |
| |
| CanvasKit.SkMatrix.multiply = function(m1, m2) { |
| var result = [0,0,0, 0,0,0, 0,0,0]; |
| for (var r = 0; r < 3; r++) { |
| for (var c = 0; c < 3; c++) { |
| // m1 and m2 are 1D arrays pretending to be 2D arrays |
| result[3*r + c] = sdot(m1[3*r + 0], m2[3*0 + c], |
| m1[3*r + 1], m2[3*1 + c], |
| m1[3*r + 2], m2[3*2 + c]); |
| } |
| } |
| return result; |
| } |
| |
| // Return a matrix representing a rotation by n radians. |
| // px, py optionally say which point the rotation should be around |
| // with the default being (0, 0); |
| CanvasKit.SkMatrix.rotated = function(radians, px, py) { |
| px = px || 0; |
| py = py || 0; |
| var sinV = Math.sin(radians); |
| var cosV = Math.cos(radians); |
| return [ |
| cosV, -sinV, sdot( sinV, py, 1 - cosV, px), |
| sinV, cosV, sdot(-sinV, px, 1 - cosV, py), |
| 0, 0, 1, |
| ]; |
| }; |
| |
| CanvasKit.SkMatrix.scaled = function(sx, sy, px, py) { |
| px = px || 0; |
| py = py || 0; |
| return [ |
| sx, 0, px - sx * px, |
| 0, sy, py - sy * py, |
| 0, 0, 1, |
| ]; |
| }; |
| |
| CanvasKit.SkMatrix.skewed = function(kx, ky, px, py) { |
| px = px || 0; |
| py = py || 0; |
| return [ |
| 1, kx, -kx * px, |
| ky, 1, -ky * py, |
| 0, 0, 1, |
| ]; |
| }; |
| |
| CanvasKit.SkMatrix.translated = function(dx, dy) { |
| return [ |
| 1, 0, dx, |
| 0, 1, dy, |
| 0, 0, 1, |
| ]; |
| }; |
| |
| CanvasKit.SkPath.prototype.addArc = function(oval, startAngle, sweepAngle) { |
| // see arc() for the HTMLCanvas version |
| // note input angles are degrees. |
| this._addArc(oval, startAngle, sweepAngle); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.addPath = function() { |
| // Takes 1, 2, 7, or 10 required args, where the first arg is always the path. |
| // The last arg is optional and chooses between add or extend mode. |
| // The options for the remaining args are: |
| // - an array of 6 or 9 parameters (perspective is optional) |
| // - the 9 parameters of a full matrix or |
| // the 6 non-perspective params of a matrix. |
| var args = Array.prototype.slice.call(arguments); |
| var path = args[0]; |
| var extend = false; |
| if (typeof args[args.length-1] === "boolean") { |
| extend = args.pop(); |
| } |
| if (args.length === 1) { |
| // Add path, unchanged. Use identity matrix |
| this._addPath(path, 1, 0, 0, |
| 0, 1, 0, |
| 0, 0, 1, |
| extend); |
| } else if (args.length === 2) { |
| // User provided the 9 params of a full matrix as an array. |
| var a = args[1]; |
| this._addPath(path, a[0], a[1], a[2], |
| a[3], a[4], a[5], |
| a[6] || 0, a[7] || 0, a[8] || 1, |
| extend); |
| } else if (args.length === 7 || args.length === 10) { |
| // User provided the 9 params of a (full) matrix directly. |
| // (or just the 6 non perspective ones) |
| // These are in the same order as what Skia expects. |
| var a = args; |
| this._addPath(path, a[1], a[2], a[3], |
| a[4], a[5], a[6], |
| a[7] || 0, a[8] || 0, a[9] || 1, |
| extend); |
| } else { |
| SkDebug('addPath expected to take 1, 2, 7, or 10 required args. Got ' + args.length); |
| return null; |
| } |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.addRect = function() { |
| // Takes 1, 2, 4 or 5 args |
| // - SkRect |
| // - SkRect, isCCW |
| // - left, top, right, bottom |
| // - left, top, right, bottom, isCCW |
| if (arguments.length === 1 || arguments.length === 2) { |
| var r = arguments[0]; |
| var ccw = arguments[1] || false; |
| this._addRect(r.fLeft, r.fTop, r.fRight, r.fBottom, ccw); |
| } else if (arguments.length === 4 || arguments.length === 5) { |
| var a = arguments; |
| this._addRect(a[0], a[1], a[2], a[3], a[4] || false); |
| } else { |
| SkDebug('addRect expected to take 1, 2, 4, or 5 args. Got ' + arguments.length); |
| return null; |
| } |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.arc = function(x, y, radius, startAngle, endAngle, ccw) { |
| // emulates the HTMLCanvas behavior. See addArc() for the SkPath version. |
| // Note input angles are radians. |
| var bounds = CanvasKit.LTRBRect(x-radius, y-radius, x+radius, y+radius); |
| var sweep = radiansToDegrees(endAngle - startAngle) - (360 * !!ccw); |
| var temp = new CanvasKit.SkPath(); |
| temp.addArc(bounds, radiansToDegrees(startAngle), sweep); |
| this.addPath(temp, true); |
| temp.delete(); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.arcTo = function(x1, y1, x2, y2, radius) { |
| this._arcTo(x1, y1, x2, y2, radius); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.close = function() { |
| this._close(); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.conicTo = function(x1, y1, x2, y2, w) { |
| this._conicTo(x1, y1, x2, y2, w); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.cubicTo = function(cp1x, cp1y, cp2x, cp2y, x, y) { |
| this._cubicTo(cp1x, cp1y, cp2x, cp2y, x, y); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.dash = function(on, off, phase) { |
| if (this._dash(on, off, phase)) { |
| return this; |
| } |
| return null; |
| }; |
| |
| CanvasKit.SkPath.prototype.lineTo = function(x, y) { |
| this._lineTo(x, y); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.moveTo = function(x, y) { |
| this._moveTo(x, y); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.op = function(otherPath, op) { |
| if (this._op(otherPath, op)) { |
| return this; |
| } |
| return null; |
| }; |
| |
| CanvasKit.SkPath.prototype.quadTo = function(cpx, cpy, x, y) { |
| this._quadTo(cpx, cpy, x, y); |
| return this; |
| }; |
| |
| CanvasKit.SkPath.prototype.simplify = function() { |
| if (this._simplify()) { |
| return this; |
| } |
| return null; |
| }; |
| |
| CanvasKit.SkPath.prototype.stroke = function(opts) { |
| // Fill out any missing values with the default values. |
| /** |
| * See externs.js for this definition |
| * @type {StrokeOpts} |
| */ |
| opts = opts || {}; |
| opts.width = opts.width || 1; |
| opts.miter_limit = opts.miter_limit || 4; |
| opts.cap = opts.cap || CanvasKit.StrokeCap.Butt; |
| opts.join = opts.join || CanvasKit.StrokeJoin.Miter; |
| if (this._stroke(opts)) { |
| return this; |
| } |
| return null; |
| }; |
| |
| CanvasKit.SkPath.prototype.transform = function() { |
| // Takes 1 or 9 args |
| if (arguments.length === 1) { |
| // argument 1 should be a 6 or 9 element array. |
| var a = arguments[0]; |
| this._transform(a[0], a[1], a[2], |
| a[3], a[4], a[5], |
| a[6] || 0, a[7] || 0, a[8] || 1); |
| } else if (arguments.length === 6 || arguments.length === 9) { |
| // these arguments are the 6 or 9 members of the matrix |
| var a = arguments; |
| this._transform(a[0], a[1], a[2], |
| a[3], a[4], a[5], |
| a[6] || 0, a[7] || 0, a[8] || 1); |
| } else { |
| throw 'transform expected to take 1 or 9 arguments. Got ' + arguments.length; |
| } |
| return this; |
| }; |
| // isComplement is optional, defaults to false |
| CanvasKit.SkPath.prototype.trim = function(startT, stopT, isComplement) { |
| if (this._trim(startT, stopT, !!isComplement)) { |
| return this; |
| } |
| return null; |
| }; |
| |
| // bones should be a 3d array. |
| // Each bone is a 3x2 transformation matrix in column major order: |
| // | scaleX skewX transX | |
| // | skewY scaleY transY | |
| // and bones is an array of those matrices. |
| // Returns a copy of this (SkVertices) with the bones applied. |
| CanvasKit.SkVertices.prototype.applyBones = function(bones) { |
| var bPtr = copy3dArray(bones, CanvasKit.HEAPF32); |
| var vert = this._applyBones(bPtr, bones.length); |
| CanvasKit._free(bPtr); |
| return vert; |
| } |
| |
| CanvasKit.SkImage.prototype.encodeToData = function() { |
| if (arguments.length === 0) { |
| return this._encodeToData(); |
| } |
| |
| if (arguments.length === 2) { |
| var a = arguments; |
| return this._encodeToDataWithFormat(a[0], a[1]); |
| } |
| |
| throw 'encodeToData expected to take 0 or 2 arguments. Got ' + arguments.length; |
| } |
| |
| // Run through the JS files that are added at compile time. |
| if (CanvasKit._extraInitializations) { |
| CanvasKit._extraInitializations.forEach(function(init) { |
| init(); |
| }); |
| } |
| } // end CanvasKit.onRuntimeInitialized, that is, anything changing prototypes or dynamic. |
| |
| CanvasKit.LTRBRect = function(l, t, r, b) { |
| return { |
| fLeft: l, |
| fTop: t, |
| fRight: r, |
| fBottom: b, |
| }; |
| } |
| |
| var nullptr = 0; // emscripten doesn't like to take null as uintptr_t |
| |
| // arr can be a normal JS array or a TypedArray |
| // dest is something like CanvasKit.HEAPF32 |
| function copy1dArray(arr, dest) { |
| if (!arr || !arr.length) { |
| return nullptr; |
| } |
| var ptr = CanvasKit._malloc(arr.length * dest.BYTES_PER_ELEMENT); |
| // In c++ terms, the WASM heap is a uint8_t*, a long buffer/array of single |
| // byte elements. When we run _malloc, we always get an offset/pointer into |
| // that block of memory. |
| // CanvasKit exposes some different views to make it easier to work with |
| // different types. HEAPF32 for example, exposes it as a float* |
| // However, to make the ptr line up, we have to do some pointer arithmetic. |
| // Concretely, we need to convert ptr to go from an index into a 1-byte-wide |
| // buffer to an index into a 4-byte-wide buffer (in the case of HEAPF32) |
| // and thus we divide ptr by 4. |
| dest.set(arr, ptr / dest.BYTES_PER_ELEMENT); |
| return ptr; |
| } |
| |
| // arr should be a non-jagged 2d JS array (TypeyArrays can't be nested |
| // inside themselves.) |
| // dest is something like CanvasKit.HEAPF32 |
| function copy2dArray(arr, dest) { |
| if (!arr || !arr.length) { |
| return nullptr; |
| } |
| var ptr = CanvasKit._malloc(arr.length * arr[0].length * dest.BYTES_PER_ELEMENT); |
| var idx = 0; |
| var adjustedPtr = ptr / dest.BYTES_PER_ELEMENT; |
| for (var r = 0; r < arr.length; r++) { |
| for (var c = 0; c < arr[0].length; c++) { |
| dest[adjustedPtr + idx] = arr[r][c]; |
| idx++; |
| } |
| } |
| return ptr; |
| } |
| |
| // arr should be a non-jagged 3d JS array (TypeyArrays can't be nested |
| // inside themselves.) |
| // dest is something like CanvasKit.HEAPF32 |
| function copy3dArray(arr, dest) { |
| if (!arr || !arr.length || !arr[0].length) { |
| return nullptr; |
| } |
| var ptr = CanvasKit._malloc(arr.length * arr[0].length * arr[0][0].length * dest.BYTES_PER_ELEMENT); |
| var idx = 0; |
| var adjustedPtr = ptr / dest.BYTES_PER_ELEMENT; |
| for (var x = 0; x < arr.length; x++) { |
| for (var y = 0; y < arr[0].length; y++) { |
| for (var z = 0; z < arr[0][0].length; z++) { |
| dest[adjustedPtr + idx] = arr[x][y][z]; |
| idx++; |
| } |
| } |
| } |
| return ptr; |
| } |
| |
| CanvasKit.MakeSkDashPathEffect = function(intervals, phase) { |
| if (!phase) { |
| phase = 0; |
| } |
| if (!intervals.length || intervals.length % 2 === 1) { |
| throw 'Intervals array must have even length'; |
| } |
| var ptr = copy1dArray(intervals, CanvasKit.HEAPF32); |
| var dpe = CanvasKit._MakeSkDashPathEffect(ptr, intervals.length, phase); |
| CanvasKit._free(ptr); |
| return dpe; |
| } |
| |
| CanvasKit.MakeImageShader = function(imgData, xTileMode, yTileMode) { |
| var iptr = CanvasKit._malloc(imgData.byteLength); |
| CanvasKit.HEAPU8.set(new Uint8Array(imgData), iptr); |
| // No need to _free iptr, ImageShader takes it with SkData::MakeFromMalloc |
| |
| return CanvasKit._MakeImageShader(iptr, imgData.byteLength, xTileMode, yTileMode); |
| } |
| |
| CanvasKit.MakeLinearGradientShader = function(start, end, colors, pos, mode, localMatrix, flags) { |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAP32); |
| var posPtr = copy1dArray(pos, CanvasKit.HEAPF32); |
| flags = flags || 0; |
| |
| if (localMatrix) { |
| // Add perspective args if not provided. |
| if (localMatrix.length === 6) { |
| localMatrix.push(0, 0, 1); |
| } |
| var lgs = CanvasKit._MakeLinearGradientShader(start, end, colorPtr, posPtr, |
| colors.length, mode, flags, localMatrix); |
| } else { |
| var lgs = CanvasKit._MakeLinearGradientShader(start, end, colorPtr, posPtr, |
| colors.length, mode, flags); |
| } |
| |
| CanvasKit._free(colorPtr); |
| CanvasKit._free(posPtr); |
| return lgs; |
| } |
| |
| CanvasKit.MakeRadialGradientShader = function(center, radius, colors, pos, mode, localMatrix, flags) { |
| // TODO: matrix and flags |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAP32); |
| var posPtr = copy1dArray(pos, CanvasKit.HEAPF32); |
| flags = flags || 0; |
| |
| if (localMatrix) { |
| // Add perspective args if not provided. |
| if (localMatrix.length === 6) { |
| localMatrix.push(0, 0, 1); |
| } |
| var rgs = CanvasKit._MakeRadialGradientShader(center, radius, colorPtr, posPtr, |
| colors.length, mode, flags, localMatrix); |
| } else { |
| var rgs = CanvasKit._MakeRadialGradientShader(center, radius, colorPtr, posPtr, |
| colors.length, mode, flags); |
| } |
| |
| CanvasKit._free(colorPtr); |
| CanvasKit._free(posPtr); |
| return rgs; |
| } |
| |
| CanvasKit.MakeSkVertices = function(mode, positions, textureCoordinates, colors, |
| boneIndices, boneWeights, indices) { |
| var positionPtr = copy2dArray(positions, CanvasKit.HEAPF32); |
| var texPtr = copy2dArray(textureCoordinates, CanvasKit.HEAPF32); |
| // Since we write the colors to memory as signed integers (JSColor), we can |
| // read them out on the other side as unsigned ints (SkColor) just fine |
| // - it's effectively casting. |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAP32); |
| |
| var boneIdxPtr = copy2dArray(boneIndices, CanvasKit.HEAP32); |
| var boneWtPtr = copy2dArray(boneWeights, CanvasKit.HEAPF32); |
| var idxPtr = copy1dArray(indices, CanvasKit.HEAPU16); |
| |
| var idxCount = (indices && indices.length) || 0; |
| // _MakeVertices will copy all the values in, so we are free to release |
| // the memory after. |
| var vertices = CanvasKit._MakeSkVertices(mode, positions.length, positionPtr, |
| texPtr, colorPtr, boneIdxPtr, boneWtPtr, |
| idxCount, idxPtr); |
| positionPtr && CanvasKit._free(positionPtr); |
| texPtr && CanvasKit._free(texPtr); |
| colorPtr && CanvasKit._free(colorPtr); |
| idxPtr && CanvasKit._free(idxPtr); |
| boneIdxPtr && CanvasKit._free(boneIdxPtr); |
| boneWtPtr && CanvasKit._free(boneWtPtr); |
| return vertices; |
| } |
| |
| CanvasKit.MakeNimaActor = function(nimaFile, nimaTexture) { |
| var nptr = CanvasKit._malloc(nimaFile.byteLength); |
| CanvasKit.HEAPU8.set(new Uint8Array(nimaFile), nptr); |
| var tptr = CanvasKit._malloc(nimaTexture.byteLength); |
| CanvasKit.HEAPU8.set(new Uint8Array(nimaTexture), tptr); |
| // No need to _free these ptrs, NimaActor takes them with SkData::MakeFromMalloc |
| |
| return CanvasKit._MakeNimaActor(nptr, nimaFile.byteLength, tptr, nimaTexture.byteLength); |
| } |
| |
| }(Module)); // When this file is loaded in, the high level object is "Module"; |
| |
| // Intentionally added outside the scope to allow usage in canvas2d.js and other |
| // pre-js files. These names are unlikely to cause emscripten collisions. |
| function radiansToDegrees(rad) { |
| return (rad / Math.PI) * 180; |
| } |
| |
| function degreesToRadians(deg) { |
| return (deg / 180) * Math.PI; |
| } |
| |