| // 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. |
| |
| // 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. |
| |
| // buffer is the underlying ArrayBuffer that is the WASM memory blob. |
| // It was removed from Emscripten proper in https://github.com/emscripten-core/emscripten/pull/8277 |
| // but it is convenient to have a reference to, so we add it back in. |
| CanvasKit.buffer = CanvasKit.HEAPU8.buffer; |
| |
| // 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. |
| // I would have liked to use something like DOMMatrix, except it |
| // isn't widely supported (would need polyfills) and it doesn't |
| // have a mapPoints() function (which could maybe be tacked on here). |
| // If DOMMatrix catches on, it would be worth re-considering this usage. |
| 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, |
| ]; |
| }; |
| |
| // Return the inverse (if it exists) of this matrix. |
| // Otherwise, return the identity. |
| CanvasKit.SkMatrix.invert = function(m) { |
| var det = m[0]*m[4]*m[8] + m[1]*m[5]*m[6] + m[2]*m[3]*m[7] |
| - m[2]*m[4]*m[6] - m[1]*m[3]*m[8] - m[0]*m[5]*m[7]; |
| if (!det) { |
| SkDebug('Warning, uninvertible matrix'); |
| return CanvasKit.SkMatrix.identity(); |
| } |
| return [ |
| (m[4]*m[8] - m[5]*m[7])/det, (m[2]*m[7] - m[1]*m[8])/det, (m[1]*m[5] - m[2]*m[4])/det, |
| (m[5]*m[6] - m[3]*m[8])/det, (m[0]*m[8] - m[2]*m[6])/det, (m[2]*m[3] - m[0]*m[5])/det, |
| (m[3]*m[7] - m[4]*m[6])/det, (m[1]*m[6] - m[0]*m[7])/det, (m[0]*m[4] - m[1]*m[3])/det, |
| ]; |
| }; |
| |
| // 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, |
| ]; |
| }; |
| |
| // An SkColorMatrix is a 4x4 color matrix that transforms the 4 color channels |
| // with a 1x4 matrix that post-translates those 4 channels. |
| // For example, the following is the layout with the scale (S) and post-transform |
| // (PT) items indicated. |
| // RS, 0, 0, 0 | RPT |
| // 0, GS, 0, 0 | GPT |
| // 0, 0, BS, 0 | BPT |
| // 0, 0, 0, AS | APT |
| // |
| // Much of this was hand-transcribed from SkColorMatrix.cpp, because it's easier to |
| // deal with a Float32Array of length 20 than to try to expose the SkColorMatrix object. |
| |
| var rScale = 0; |
| var gScale = 6; |
| var bScale = 12; |
| var aScale = 18; |
| |
| var rPostTrans = 4; |
| var gPostTrans = 9; |
| var bPostTrans = 14; |
| var aPostTrans = 19; |
| |
| CanvasKit.SkColorMatrix = {}; |
| CanvasKit.SkColorMatrix.identity = function() { |
| var m = new Float32Array(20); |
| m[rScale] = 1; |
| m[gScale] = 1; |
| m[bScale] = 1; |
| m[aScale] = 1; |
| return m; |
| } |
| |
| CanvasKit.SkColorMatrix.scaled = function(rs, gs, bs, as) { |
| var m = new Float32Array(20); |
| m[rScale] = rs; |
| m[gScale] = gs; |
| m[bScale] = bs; |
| m[aScale] = as; |
| return m; |
| } |
| |
| var rotateIndices = [ |
| [6, 7, 11, 12], |
| [0, 10, 2, 12], |
| [0, 1, 5, 6], |
| ]; |
| // axis should be 0, 1, 2 for r, g, b |
| CanvasKit.SkColorMatrix.rotated = function(axis, sine, cosine) { |
| var m = CanvasKit.SkColorMatrix.identity(); |
| var indices = rotateIndices[axis]; |
| m[indices[0]] = cosine; |
| m[indices[1]] = sine; |
| m[indices[2]] = -sine; |
| m[indices[3]] = cosine; |
| return m; |
| } |
| |
| // m is a SkColorMatrix (i.e. a Float32Array), and this sets the 4 "special" |
| // params that will translate the colors after they are multiplied by the 4x4 matrix. |
| CanvasKit.SkColorMatrix.postTranslate = function(m, dr, dg, db, da) { |
| m[rPostTrans] += dr; |
| m[gPostTrans] += dg; |
| m[bPostTrans] += db; |
| m[aPostTrans] += da; |
| return m; |
| } |
| |
| // concat returns a new SkColorMatrix that is the result of multiplying outer*inner; |
| CanvasKit.SkColorMatrix.concat = function(outer, inner) { |
| var m = new Float32Array(20); |
| var index = 0; |
| for (var j = 0; j < 20; j += 5) { |
| for (var i = 0; i < 4; i++) { |
| m[index++] = outer[j + 0] * inner[i + 0] + |
| outer[j + 1] * inner[i + 5] + |
| outer[j + 2] * inner[i + 10] + |
| outer[j + 3] * inner[i + 15]; |
| } |
| m[index++] = outer[j + 0] * inner[4] + |
| outer[j + 1] * inner[9] + |
| outer[j + 2] * inner[14] + |
| outer[j + 3] * inner[19] + |
| outer[j + 4]; |
| } |
| |
| return m; |
| } |
| |
| 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.addOval = function(oval, isCCW, startIndex) { |
| if (startIndex === undefined) { |
| startIndex = 1; |
| } |
| this._addOval(oval, !!isCCW, startIndex); |
| 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.addRoundRect = function() { |
| // Takes 3, 4, 6 or 7 args |
| // - SkRect, radii, ccw |
| // - SkRect, rx, ry, ccw |
| // - left, top, right, bottom, radii, ccw |
| // - left, top, right, bottom, rx, ry, ccw |
| var args = arguments; |
| if (args.length === 3 || args.length === 6) { |
| var radii = args[args.length-2]; |
| } else if (args.length === 6 || args.length === 7){ |
| // duplicate the given (rx, ry) pairs for each corner. |
| var rx = args[args.length-3]; |
| var ry = args[args.length-2]; |
| var radii = [rx, ry, rx, ry, rx, ry, rx, ry]; |
| } else { |
| SkDebug('addRoundRect expected to take 3, 4, 6, or 7 args. Got ' + args.length); |
| return null; |
| } |
| if (radii.length !== 8) { |
| SkDebug('addRoundRect needs 8 radii provided. Got ' + radii.length); |
| return null; |
| } |
| var rptr = copy1dArray(radii, CanvasKit.HEAPF32); |
| if (args.length === 3 || args.length === 4) { |
| var r = args[0]; |
| var ccw = args[args.length - 1]; |
| this._addRoundRect(r.fLeft, r.fTop, r.fRight, r.fBottom, rptr, ccw); |
| } else if (args.length === 6 || args.length === 7) { |
| var a = args; |
| this._addRoundRect(a[0], a[1], a[2], a[3], rptr, ccw); |
| } |
| CanvasKit._free(rptr); |
| 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() { |
| // takes 4, 5 or 7 args |
| // - 5 x1, y1, x2, y2, radius |
| // - 4 oval (as Rect), startAngle, sweepAngle, forceMoveTo |
| // - 7 rx, ry, xAxisRotate, useSmallArc, isCCW, x, y |
| var args = arguments; |
| if (args.length === 5) { |
| this._arcTo(args[0], args[1], args[2], args[3], args[4]); |
| } else if (args.length === 4) { |
| this._arcTo(args[0], args[1], args[2], args[3]); |
| } else if (args.length === 7) { |
| this._arcTo(args[0], args[1], args[2], !!args[3], !!args[4], args[5], args[6]); |
| } else { |
| throw 'Invalid args for arcTo. Expected 4, 5, or 7, got '+ args.length; |
| } |
| |
| 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.offset = function(dx, dy) { |
| this._transform(1, 0, dx, |
| 0, 1, dy, |
| 0, 0, 1); |
| 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; |
| opts.precision = opts.precision || 1; |
| 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) { |
| 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; |
| } |
| |
| CanvasKit.SkImage.prototype.makeShader = function(xTileMode, yTileMode, localMatrix) { |
| if (localMatrix) { |
| // Add perspective args if not provided. |
| if (localMatrix.length === 6) { |
| localMatrix.push(0, 0, 1); |
| } |
| return this._makeShader(xTileMode, yTileMode, localMatrix); |
| } else { |
| return this._makeShader(xTileMode, yTileMode); |
| } |
| } |
| |
| CanvasKit.SkImage.prototype.readPixels = function(imageInfo, srcX, srcY) { |
| var rowBytes; |
| switch (imageInfo.colorType){ |
| case CanvasKit.ColorType.RGBA_8888: |
| rowBytes = imageInfo.width * 4; // 1 byte per channel == 4 bytes per pixel in 8888 |
| break; |
| case CanvasKit.ColorType.RGBA_F32: |
| rowBytes = imageInfo.width * 16; // 4 bytes per channel == 16 bytes per pixel in F32 |
| break; |
| default: |
| SkDebug("Colortype not yet supported"); |
| return; |
| } |
| var pBytes = rowBytes * imageInfo.height; |
| var pPtr = CanvasKit._malloc(pBytes); |
| |
| if (!this._readPixels(imageInfo, pPtr, rowBytes, srcX, srcY)) { |
| SkDebug("Could not read pixels with the given inputs"); |
| return null; |
| } |
| |
| // Put those pixels into a typed array of the right format and then |
| // make a copy with slice() that we can return. |
| var retVal = null; |
| switch (imageInfo.colorType){ |
| case CanvasKit.ColorType.RGBA_8888: |
| retVal = new Uint8Array(CanvasKit.buffer, pPtr, pBytes).slice(); |
| break; |
| case CanvasKit.ColorType.RGBA_F32: |
| retVal = new Float32Array(CanvasKit.buffer, pPtr, pBytes).slice(); |
| break; |
| } |
| |
| // Free the allocated pixels in the WASM memory |
| CanvasKit._free(pPtr); |
| return retVal; |
| |
| } |
| |
| // atlas is an SkImage, e.g. from CanvasKit.MakeImageFromEncoded |
| // srcRects and dstXforms should be CanvasKit.SkRectBuilder and CanvasKit.RSXFormBuilder |
| // or just arrays of floats in groups of 4. |
| // colors, if provided, should be a CanvasKit.SkColorBuilder or array of SkColor |
| // (from CanvasKit.Color) |
| CanvasKit.SkCanvas.prototype.drawAtlas = function(atlas, srcRects, dstXforms, paint, |
| /*optional*/ blendMode, colors) { |
| if (!atlas || !paint || !srcRects || !dstXforms) { |
| SkDebug('Doing nothing since missing a required input'); |
| return; |
| } |
| if (srcRects.length !== dstXforms.length || (colors && colors.length !== dstXforms.length)) { |
| SkDebug('Doing nothing since input arrays length mismatches'); |
| } |
| if (!blendMode) { |
| blendMode = CanvasKit.BlendMode.SrcOver; |
| } |
| |
| var srcRectPtr; |
| if (srcRects.build) { |
| srcRectPtr = srcRects.build(); |
| } else { |
| srcRectPtr = copy1dArray(srcRects, CanvasKit.HEAPF32); |
| } |
| |
| var dstXformPtr; |
| if (dstXforms.build) { |
| dstXformPtr = dstXforms.build(); |
| } else { |
| dstXformPtr = copy1dArray(dstXforms, CanvasKit.HEAPF32); |
| } |
| |
| var colorPtr = 0; // enscriptem doesn't like undefined for nullptr |
| if (colors) { |
| if (colors.build) { |
| colorPtr = colors.build(); |
| } else { |
| colorPtr = copy1dArray(colors, CanvasKit.HEAPU32); |
| } |
| } |
| |
| this._drawAtlas(atlas, dstXformPtr, srcRectPtr, colorPtr, dstXforms.length, |
| blendMode, paint); |
| |
| if (srcRectPtr && !srcRects.build) { |
| CanvasKit._free(srcRectPtr); |
| } |
| if (dstXformPtr && !dstXforms.build) { |
| CanvasKit._free(dstXformPtr); |
| } |
| if (colorPtr && !colors.build) { |
| CanvasKit._free(colorPtr); |
| } |
| |
| } |
| |
| // str can be either a text string or a ShapedText object |
| CanvasKit.SkCanvas.prototype.drawText = function(str, x, y, paint, font) { |
| if (typeof str === 'string') { |
| // lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten |
| // JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8 |
| var strLen = lengthBytesUTF8(str); |
| // Add 1 for null terminator, which we need when copying/converting, but can ignore |
| // when we call into Skia. |
| var strPtr = CanvasKit._malloc(strLen + 1); |
| stringToUTF8(str, strPtr, strLen + 1); |
| this._drawSimpleText(strPtr, strLen, x, y, font, paint); |
| } else { |
| this._drawShapedText(str, x, y, paint); |
| } |
| } |
| |
| // returns Uint8Array |
| CanvasKit.SkCanvas.prototype.readPixels = function(x, y, w, h, alphaType, |
| colorType, dstRowBytes) { |
| // supply defaults (which are compatible with HTMLCanvas's getImageData) |
| alphaType = alphaType || CanvasKit.AlphaType.Unpremul; |
| colorType = colorType || CanvasKit.ColorType.RGBA_8888; |
| dstRowBytes = dstRowBytes || (4 * w); |
| |
| var len = h * dstRowBytes |
| var pptr = CanvasKit._malloc(len); |
| var ok = this._readPixels({ |
| 'width': w, |
| 'height': h, |
| 'colorType': colorType, |
| 'alphaType': alphaType, |
| }, pptr, dstRowBytes, x, y); |
| if (!ok) { |
| CanvasKit._free(pptr); |
| return null; |
| } |
| |
| // The first typed array is just a view into memory. Because we will |
| // be free-ing that, we call slice to make a persistent copy. |
| var pixels = new Uint8Array(CanvasKit.buffer, pptr, len).slice(); |
| CanvasKit._free(pptr); |
| return pixels; |
| } |
| |
| // pixels is a TypedArray. No matter the input size, it will be treated as |
| // a Uint8Array (essentially, a byte array). |
| CanvasKit.SkCanvas.prototype.writePixels = function(pixels, srcWidth, srcHeight, |
| destX, destY, alphaType, colorType) { |
| if (pixels.byteLength % (srcWidth * srcHeight)) { |
| throw 'pixels length must be a multiple of the srcWidth * srcHeight'; |
| } |
| var bytesPerPixel = pixels.byteLength / (srcWidth * srcHeight); |
| // supply defaults (which are compatible with HTMLCanvas's putImageData) |
| alphaType = alphaType || CanvasKit.AlphaType.Unpremul; |
| colorType = colorType || CanvasKit.ColorType.RGBA_8888; |
| var srcRowBytes = bytesPerPixel * srcWidth; |
| |
| var pptr = CanvasKit._malloc(pixels.byteLength); |
| CanvasKit.HEAPU8.set(pixels, pptr); |
| |
| var ok = this._writePixels({ |
| 'width': srcWidth, |
| 'height': srcHeight, |
| 'colorType': colorType, |
| 'alphaType': alphaType, |
| }, pptr, srcRowBytes, destX, destY); |
| |
| CanvasKit._free(pptr); |
| return ok; |
| } |
| |
| // colorMatrix is an SkColorMatrix (e.g. Float32Array of length 20) |
| CanvasKit.SkColorFilter.MakeMatrix = function(colorMatrix) { |
| if (!colorMatrix || colorMatrix.length !== 20) { |
| SkDebug('ignoring invalid color matrix'); |
| return; |
| } |
| var fptr = copy1dArray(colorMatrix, CanvasKit.HEAPF32); |
| // We know skia memcopies the floats, so we can free our memory after the call returns. |
| var m = CanvasKit.SkColorFilter._makeMatrix(fptr); |
| CanvasKit._free(fptr); |
| return m; |
| } |
| |
| // Returns an array of the widths of the glyphs in this string. |
| CanvasKit.SkFont.prototype.getWidths = function(str) { |
| // add 1 for null terminator |
| var codePoints = str.length + 1; |
| // lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten |
| // JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8 |
| // Add 1 for null terminator |
| var strBytes = lengthBytesUTF8(str) + 1; |
| var strPtr = CanvasKit._malloc(strBytes); |
| stringToUTF8(str, strPtr, strBytes); |
| |
| var bytesPerFloat = 4; |
| // allocate widths == numCodePoints |
| var widthPtr = CanvasKit._malloc(codePoints * bytesPerFloat); |
| if (!this._getWidths(strPtr, strBytes, codePoints, widthPtr)) { |
| SkDebug('Could not compute widths'); |
| CanvasKit._free(strPtr); |
| CanvasKit._free(widthPtr); |
| return null; |
| } |
| // reminder, this shouldn't copy the data, just is a nice way to |
| // wrap 4 bytes together into a float. |
| var widths = new Float32Array(CanvasKit.buffer, widthPtr, codePoints); |
| // This copies the data so we can free the CanvasKit memory |
| var retVal = Array.from(widths); |
| CanvasKit._free(strPtr); |
| CanvasKit._free(widthPtr); |
| return retVal; |
| } |
| |
| // arguments should all be arrayBuffers or be an array of arrayBuffers. |
| CanvasKit.SkFontMgr.FromData = function() { |
| if (!arguments.length) { |
| SkDebug('Could not make SkFontMgr from no font sources'); |
| return null; |
| } |
| var fonts = arguments; |
| if (fonts.length === 1 && Array.isArray(fonts[0])) { |
| fonts = arguments[0]; |
| } |
| if (!fonts.length) { |
| SkDebug('Could not make SkFontMgr from no font sources'); |
| return null; |
| } |
| var dPtrs = []; |
| var sizes = []; |
| for (var i = 0; i < fonts.length; i++) { |
| var data = new Uint8Array(fonts[i]); |
| var dptr = copy1dArray(data, CanvasKit.HEAPU8); |
| dPtrs.push(dptr); |
| sizes.push(data.byteLength); |
| } |
| // Pointers are 32 bit unsigned ints |
| var datasPtr = copy1dArray(dPtrs, CanvasKit.HEAPU32); |
| var sizesPtr = copy1dArray(sizes, CanvasKit.HEAPU32); |
| var fm = CanvasKit.SkFontMgr._fromData(datasPtr, sizesPtr, fonts.length); |
| // The SkFontMgr has taken ownership of the bytes we allocated in the for loop. |
| CanvasKit._free(datasPtr); |
| CanvasKit._free(sizesPtr); |
| return fm; |
| } |
| |
| // fontData should be an arrayBuffer |
| CanvasKit.SkFontMgr.prototype.MakeTypefaceFromData = function(fontData) { |
| var data = new Uint8Array(fontData); |
| |
| var fptr = copy1dArray(data, CanvasKit.HEAPU8); |
| var font = this._makeTypefaceFromData(fptr, data.byteLength); |
| if (!font) { |
| SkDebug('Could not decode font data'); |
| // We do not need to free the data since the C++ will do that for us |
| // when the font is deleted (or fails to decode); |
| return null; |
| } |
| return font; |
| } |
| |
| // The serialized format of an SkPicture (informally called an "skp"), is not something |
| // that clients should ever rely on. It is useful when filing bug reports, but that's |
| // about it. The format may change at anytime and no promises are made for backwards |
| // or forward compatibility. |
| CanvasKit.SkPicture.prototype.DEBUGONLY_saveAsFile = function(skpName) { |
| var data = this.DEBUGONLY_serialize(); |
| if (!data) { |
| SkDebug('Could not serialize to skpicture.'); |
| return; |
| } |
| var bytes = CanvasKit.getSkDataBytes(data); |
| saveBytesToFile(bytes, skpName); |
| data.delete(); |
| } |
| |
| CanvasKit.SkSurface.prototype.captureFrameAsSkPicture = function(drawFrame) { |
| // Set up SkPictureRecorder |
| var spr = new CanvasKit.SkPictureRecorder(); |
| var canvas = spr.beginRecording( |
| CanvasKit.LTRBRect(0, 0, this.width(), this.height())); |
| drawFrame(canvas); |
| var pic = spr.finishRecordingAsPicture(); |
| spr.delete(); |
| // TODO: do we need to clean up the memory for canvas? |
| // If we delete it here, saveAsFile doesn't work correctly. |
| return pic; |
| } |
| |
| CanvasKit.SkSurface.prototype.requestAnimationFrame = function(callback, dirtyRect) { |
| if (!this._cached_canvas) { |
| this._cached_canvas = this.getCanvas(); |
| } |
| window.requestAnimationFrame(function() { |
| if (this._context !== undefined) { |
| CanvasKit.setCurrentContext(this._context); |
| } |
| |
| callback(this._cached_canvas); |
| |
| this.flush(); |
| }.bind(this)); |
| } |
| |
| CanvasKit.SkTextBlob.MakeOnPath = function(str, path, font, initialOffset) { |
| if (!str || !str.length) { |
| SkDebug('ignoring 0 length string'); |
| return; |
| } |
| if (!path || !path.countPoints()) { |
| SkDebug('ignoring empty path'); |
| return; |
| } |
| if (path.countPoints() === 1) { |
| SkDebug('path has 1 point, returning normal textblob'); |
| return this.MakeFromText(str, font); |
| } |
| |
| if (!initialOffset) { |
| initialOffset = 0; |
| } |
| |
| var widths = font.getWidths(str); |
| |
| var rsx = new CanvasKit.RSXFormBuilder(); |
| var meas = new CanvasKit.SkPathMeasure(path, false, 1); |
| var dist = initialOffset; |
| for (var i = 0; i < str.length; i++) { |
| var width = widths[i]; |
| dist += width/2; |
| if (dist > meas.getLength()) { |
| // jump to next contour |
| if (!meas.nextContour()) { |
| // We have come to the end of the path - terminate the string |
| // right here. |
| str = str.substring(0, i); |
| break; |
| } |
| dist = width/2; |
| } |
| |
| // Gives us the (x, y) coordinates as well as the cos/sin of the tangent |
| // line at that position. |
| var xycs = meas.getPosTan(dist); |
| var cx = xycs[0]; |
| var cy = xycs[1]; |
| var cosT = xycs[2]; |
| var sinT = xycs[3]; |
| |
| var adjustedX = cx - (width/2 * cosT); |
| var adjustedY = cy - (width/2 * sinT); |
| |
| rsx.push(cosT, sinT, adjustedX, adjustedY); |
| dist += width/2; |
| } |
| var retVal = this.MakeFromRSXform(str, rsx, font); |
| rsx.delete(); |
| meas.delete(); |
| return retVal; |
| } |
| |
| CanvasKit.SkTextBlob.MakeFromRSXform = function(str, rsxBuilder, font) { |
| // lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten |
| // JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8 |
| // Add 1 for null terminator |
| var strLen = lengthBytesUTF8(str) + 1; |
| var strPtr = CanvasKit._malloc(strLen); |
| // Add 1 for the null terminator. |
| stringToUTF8(str, strPtr, strLen); |
| var rptr = rsxBuilder.build(); |
| |
| var blob = CanvasKit.SkTextBlob._MakeFromRSXform(strPtr, strLen - 1, |
| rptr, font, CanvasKit.TextEncoding.UTF8); |
| if (!blob) { |
| SkDebug('Could not make textblob from string "' + str + '"'); |
| return null; |
| } |
| |
| var origDelete = blob.delete.bind(blob); |
| blob.delete = function() { |
| CanvasKit._free(strPtr); |
| origDelete(); |
| } |
| return blob; |
| } |
| |
| CanvasKit.SkTextBlob.MakeFromText = function(str, font) { |
| // lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten |
| // JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8 |
| // Add 1 for null terminator |
| var strLen = lengthBytesUTF8(str) + 1; |
| var strPtr = CanvasKit._malloc(strLen); |
| // Add 1 for the null terminator. |
| stringToUTF8(str, strPtr, strLen); |
| |
| var blob = CanvasKit.SkTextBlob._MakeFromText(strPtr, strLen - 1, font, CanvasKit.TextEncoding.UTF8); |
| if (!blob) { |
| SkDebug('Could not make textblob from string "' + str + '"'); |
| return null; |
| } |
| |
| var origDelete = blob.delete.bind(blob); |
| blob.delete = function() { |
| CanvasKit._free(strPtr); |
| origDelete(); |
| } |
| return blob; |
| } |
| |
| // 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, |
| }; |
| } |
| |
| CanvasKit.XYWHRect = function(x, y, w, h) { |
| return { |
| fLeft: x, |
| fTop: y, |
| fRight: x+w, |
| fBottom: y+h, |
| }; |
| } |
| |
| // RRectXY returns an RRect with the given rect and a radiusX and radiusY for |
| // all 4 corners. |
| CanvasKit.RRectXY = function(rect, rx, ry) { |
| return { |
| rect: rect, |
| rx1: rx, |
| ry1: ry, |
| rx2: rx, |
| ry2: ry, |
| rx3: rx, |
| ry3: ry, |
| rx4: rx, |
| ry4: ry, |
| }; |
| } |
| |
| CanvasKit.MakePathFromCmds = function(cmds) { |
| var ptrLen = loadCmdsTypedArray(cmds); |
| var path = CanvasKit._MakePathFromCmds(ptrLen[0], ptrLen[1]); |
| CanvasKit._free(ptrLen[0]); |
| return path; |
| } |
| |
| 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; |
| } |
| |
| // data is a TypedArray or ArrayBuffer e.g. from fetch().then(resp.arrayBuffer()) |
| CanvasKit.MakeAnimatedImageFromEncoded = function(data) { |
| data = new Uint8Array(data); |
| |
| var iptr = CanvasKit._malloc(data.byteLength); |
| CanvasKit.HEAPU8.set(data, iptr); |
| var img = CanvasKit._decodeAnimatedImage(iptr, data.byteLength); |
| if (!img) { |
| SkDebug('Could not decode animated image'); |
| return null; |
| } |
| return img; |
| } |
| |
| // data is a TypedArray or ArrayBuffer e.g. from fetch().then(resp.arrayBuffer()) |
| CanvasKit.MakeImageFromEncoded = function(data) { |
| data = new Uint8Array(data); |
| |
| var iptr = CanvasKit._malloc(data.byteLength); |
| CanvasKit.HEAPU8.set(data, iptr); |
| var img = CanvasKit._decodeImage(iptr, data.byteLength); |
| if (!img) { |
| SkDebug('Could not decode image'); |
| return null; |
| } |
| return img; |
| } |
| |
| // pixels is a Uint8Array |
| CanvasKit.MakeImage = function(pixels, width, height, alphaType, colorType) { |
| var bytesPerPixel = pixels.byteLength / (width * height); |
| var info = { |
| 'width': width, |
| 'height': height, |
| 'alphaType': alphaType, |
| 'colorType': colorType, |
| }; |
| var pptr = CanvasKit._malloc(pixels.byteLength); |
| CanvasKit.HEAPU8.set(pixels, pptr); |
| // No need to _free iptr, Image takes it with SkData::MakeFromMalloc |
| |
| return CanvasKit._MakeImage(info, pptr, pixels.byteLength, width * bytesPerPixel); |
| } |
| |
| CanvasKit.MakeLinearGradientShader = function(start, end, colors, pos, mode, localMatrix, flags) { |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAPU32); |
| 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) { |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAPU32); |
| 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.MakeTwoPointConicalGradientShader = function(start, startRadius, end, endRadius, |
| colors, pos, mode, localMatrix, flags) { |
| var colorPtr = copy1dArray(colors, CanvasKit.HEAPU32); |
| 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._MakeTwoPointConicalGradientShader( |
| start, startRadius, end, endRadius, |
| colorPtr, posPtr, colors.length, mode, flags, localMatrix); |
| } else { |
| var rgs = CanvasKit._MakeTwoPointConicalGradientShader( |
| start, startRadius, end, endRadius, |
| colorPtr, posPtr, colors.length, mode, flags); |
| } |
| |
| CanvasKit._free(colorPtr); |
| CanvasKit._free(posPtr); |
| return rgs; |
| } |
| |
| CanvasKit.MakeSkVertices = function(mode, positions, textureCoordinates, colors, |
| boneIndices, boneWeights, indices, isVolatile) { |
| // Default isVolitile to true if not set |
| isVolatile = isVolatile === undefined ? true : isVolatile; |
| var idxCount = (indices && indices.length) || 0; |
| |
| var flags = 0; |
| // These flags are from SkVertices.h and should be kept in sync with those. |
| if (textureCoordinates && textureCoordinates.length) { |
| flags |= (1 << 0); |
| } |
| if (colors && colors.length) { |
| flags |= (1 << 1); |
| } |
| if (boneIndices && boneIndices.length) { |
| flags |= (1 << 2); |
| } |
| if (!isVolatile) { |
| flags |= (1 << 3); |
| } |
| |
| var builder = new CanvasKit._SkVerticesBuilder(mode, positions.length, idxCount, flags); |
| |
| copy2dArray(positions, CanvasKit.HEAPF32, builder.positions()); |
| if (builder.texCoords()) { |
| copy2dArray(textureCoordinates, CanvasKit.HEAPF32, builder.texCoords()); |
| } |
| if (builder.colors()) { |
| copy1dArray(colors, CanvasKit.HEAPU32, builder.colors()); |
| } |
| if (builder.boneIndices()) { |
| copy2dArray(boneIndices, CanvasKit.HEAP32, builder.boneIndices()); |
| } |
| if (builder.boneWeights()) { |
| copy2dArray(boneWeights, CanvasKit.HEAPF32, builder.boneWeights()); |
| } |
| if (builder.indices()) { |
| copy1dArray(indices, CanvasKit.HEAPU16, builder.indices()); |
| } |
| |
| var idxCount = (indices && indices.length) || 0; |
| // Create the vertices, which owns the memory that the builder had allocated. |
| return builder.detach(); |
| }; |
