eda0b436df
This was originally exposed for use with specs/web-img-decode and has seen some actual use. Change-Id: I6cc4fdf431b45cbbc21b91881c688c5545ca44a3 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/257317 Reviewed-by: Kevin Lubick <kjlubick@google.com>
1197 lines
39 KiB
JavaScript
1197 lines
39 KiB
JavaScript
// Adds JS functions to augment the CanvasKit interface.
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// For example, if there is a wrapper around the C++ call or logic to allow
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// chaining, it should go here.
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// CanvasKit.onRuntimeInitialized is called after the WASM library has loaded.
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// Anything that modifies an exposed class (e.g. SkPath) should be set
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// after onRuntimeInitialized, otherwise, it can happen outside of that scope.
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CanvasKit.onRuntimeInitialized = function() {
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// All calls to 'this' need to go in externs.js so closure doesn't minify them away.
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// buffer is the underlying ArrayBuffer that is the WASM memory blob.
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// It was removed from Emscripten proper in https://github.com/emscripten-core/emscripten/pull/8277
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// but it is convenient to have a reference to, so we add it back in.
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CanvasKit.buffer = CanvasKit.HEAPU8.buffer;
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// Add some helpers for matrices. This is ported from SkMatrix.cpp
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// to save complexity and overhead of going back and forth between
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// C++ and JS layers.
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// I would have liked to use something like DOMMatrix, except it
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// isn't widely supported (would need polyfills) and it doesn't
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// have a mapPoints() function (which could maybe be tacked on here).
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// If DOMMatrix catches on, it would be worth re-considering this usage.
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CanvasKit.SkMatrix = {};
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function sdot(a, b, c, d, e, f) {
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e = e || 0;
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f = f || 0;
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return a * b + c * d + e * f;
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}
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CanvasKit.SkMatrix.identity = function() {
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return [
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1, 0, 0,
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0, 1, 0,
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0, 0, 1,
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];
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};
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// Return the inverse (if it exists) of this matrix.
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// Otherwise, return the identity.
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CanvasKit.SkMatrix.invert = function(m) {
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var det = m[0]*m[4]*m[8] + m[1]*m[5]*m[6] + m[2]*m[3]*m[7]
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- m[2]*m[4]*m[6] - m[1]*m[3]*m[8] - m[0]*m[5]*m[7];
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if (!det) {
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SkDebug('Warning, uninvertible matrix');
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return CanvasKit.SkMatrix.identity();
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}
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return [
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(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,
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(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,
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(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,
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];
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};
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// Maps the given points according to the passed in matrix.
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// Results are done in place.
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// See SkMatrix.h::mapPoints for the docs on the math.
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CanvasKit.SkMatrix.mapPoints = function(matrix, ptArr) {
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if (ptArr.length % 2) {
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throw 'mapPoints requires an even length arr';
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}
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for (var i = 0; i < ptArr.length; i+=2) {
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var x = ptArr[i], y = ptArr[i+1];
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// Gx+Hy+I
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var denom = matrix[6]*x + matrix[7]*y + matrix[8];
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// Ax+By+C
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var xTrans = matrix[0]*x + matrix[1]*y + matrix[2];
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// Dx+Ey+F
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var yTrans = matrix[3]*x + matrix[4]*y + matrix[5];
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ptArr[i] = xTrans/denom;
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ptArr[i+1] = yTrans/denom;
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}
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return ptArr;
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};
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CanvasKit.SkMatrix.multiply = function(m1, m2) {
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var result = [0,0,0, 0,0,0, 0,0,0];
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for (var r = 0; r < 3; r++) {
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for (var c = 0; c < 3; c++) {
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// m1 and m2 are 1D arrays pretending to be 2D arrays
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result[3*r + c] = sdot(m1[3*r + 0], m2[3*0 + c],
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m1[3*r + 1], m2[3*1 + c],
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m1[3*r + 2], m2[3*2 + c]);
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}
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}
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return result;
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}
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// Return a matrix representing a rotation by n radians.
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// px, py optionally say which point the rotation should be around
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// with the default being (0, 0);
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CanvasKit.SkMatrix.rotated = function(radians, px, py) {
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px = px || 0;
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py = py || 0;
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var sinV = Math.sin(radians);
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var cosV = Math.cos(radians);
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return [
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cosV, -sinV, sdot( sinV, py, 1 - cosV, px),
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sinV, cosV, sdot(-sinV, px, 1 - cosV, py),
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0, 0, 1,
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];
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};
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CanvasKit.SkMatrix.scaled = function(sx, sy, px, py) {
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px = px || 0;
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py = py || 0;
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return [
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sx, 0, px - sx * px,
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0, sy, py - sy * py,
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0, 0, 1,
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];
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};
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CanvasKit.SkMatrix.skewed = function(kx, ky, px, py) {
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px = px || 0;
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py = py || 0;
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return [
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1, kx, -kx * px,
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ky, 1, -ky * py,
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0, 0, 1,
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];
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};
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CanvasKit.SkMatrix.translated = function(dx, dy) {
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return [
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1, 0, dx,
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0, 1, dy,
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0, 0, 1,
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];
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};
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// An SkColorMatrix is a 4x4 color matrix that transforms the 4 color channels
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// with a 1x4 matrix that post-translates those 4 channels.
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// For example, the following is the layout with the scale (S) and post-transform
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// (PT) items indicated.
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// RS, 0, 0, 0 | RPT
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// 0, GS, 0, 0 | GPT
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// 0, 0, BS, 0 | BPT
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// 0, 0, 0, AS | APT
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//
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// Much of this was hand-transcribed from SkColorMatrix.cpp, because it's easier to
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// deal with a Float32Array of length 20 than to try to expose the SkColorMatrix object.
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var rScale = 0;
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var gScale = 6;
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var bScale = 12;
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var aScale = 18;
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var rPostTrans = 4;
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var gPostTrans = 9;
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var bPostTrans = 14;
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var aPostTrans = 19;
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CanvasKit.SkColorMatrix = {};
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CanvasKit.SkColorMatrix.identity = function() {
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var m = new Float32Array(20);
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m[rScale] = 1;
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m[gScale] = 1;
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m[bScale] = 1;
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m[aScale] = 1;
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return m;
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}
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CanvasKit.SkColorMatrix.scaled = function(rs, gs, bs, as) {
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var m = new Float32Array(20);
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m[rScale] = rs;
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m[gScale] = gs;
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m[bScale] = bs;
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m[aScale] = as;
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return m;
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}
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var rotateIndices = [
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[6, 7, 11, 12],
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[0, 10, 2, 12],
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[0, 1, 5, 6],
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];
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// axis should be 0, 1, 2 for r, g, b
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CanvasKit.SkColorMatrix.rotated = function(axis, sine, cosine) {
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var m = CanvasKit.SkColorMatrix.identity();
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var indices = rotateIndices[axis];
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m[indices[0]] = cosine;
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m[indices[1]] = sine;
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m[indices[2]] = -sine;
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m[indices[3]] = cosine;
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return m;
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}
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// m is a SkColorMatrix (i.e. a Float32Array), and this sets the 4 "special"
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// params that will translate the colors after they are multiplied by the 4x4 matrix.
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CanvasKit.SkColorMatrix.postTranslate = function(m, dr, dg, db, da) {
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m[rPostTrans] += dr;
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m[gPostTrans] += dg;
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m[bPostTrans] += db;
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m[aPostTrans] += da;
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return m;
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}
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// concat returns a new SkColorMatrix that is the result of multiplying outer*inner;
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CanvasKit.SkColorMatrix.concat = function(outer, inner) {
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var m = new Float32Array(20);
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var index = 0;
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for (var j = 0; j < 20; j += 5) {
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for (var i = 0; i < 4; i++) {
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m[index++] = outer[j + 0] * inner[i + 0] +
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outer[j + 1] * inner[i + 5] +
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outer[j + 2] * inner[i + 10] +
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outer[j + 3] * inner[i + 15];
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}
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m[index++] = outer[j + 0] * inner[4] +
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outer[j + 1] * inner[9] +
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outer[j + 2] * inner[14] +
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outer[j + 3] * inner[19] +
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outer[j + 4];
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}
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return m;
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}
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CanvasKit.SkPath.prototype.addArc = function(oval, startAngle, sweepAngle) {
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// see arc() for the HTMLCanvas version
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// note input angles are degrees.
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this._addArc(oval, startAngle, sweepAngle);
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return this;
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};
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CanvasKit.SkPath.prototype.addOval = function(oval, isCCW, startIndex) {
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if (startIndex === undefined) {
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startIndex = 1;
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}
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this._addOval(oval, !!isCCW, startIndex);
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return this;
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};
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CanvasKit.SkPath.prototype.addPath = function() {
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// Takes 1, 2, 7, or 10 required args, where the first arg is always the path.
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// The last arg is optional and chooses between add or extend mode.
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// The options for the remaining args are:
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// - an array of 6 or 9 parameters (perspective is optional)
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// - the 9 parameters of a full matrix or
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// the 6 non-perspective params of a matrix.
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var args = Array.prototype.slice.call(arguments);
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var path = args[0];
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var extend = false;
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if (typeof args[args.length-1] === "boolean") {
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extend = args.pop();
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}
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if (args.length === 1) {
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// Add path, unchanged. Use identity matrix
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this._addPath(path, 1, 0, 0,
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0, 1, 0,
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0, 0, 1,
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extend);
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} else if (args.length === 2) {
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// User provided the 9 params of a full matrix as an array.
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var a = args[1];
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this._addPath(path, a[0], a[1], a[2],
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a[3], a[4], a[5],
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a[6] || 0, a[7] || 0, a[8] || 1,
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extend);
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} else if (args.length === 7 || args.length === 10) {
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// User provided the 9 params of a (full) matrix directly.
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// (or just the 6 non perspective ones)
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// These are in the same order as what Skia expects.
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var a = args;
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this._addPath(path, a[1], a[2], a[3],
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a[4], a[5], a[6],
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a[7] || 0, a[8] || 0, a[9] || 1,
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extend);
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} else {
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SkDebug('addPath expected to take 1, 2, 7, or 10 required args. Got ' + args.length);
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return null;
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}
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return this;
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};
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// points is either an array of [x, y] where x and y are numbers or
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// a typed array from Malloc where the even indices will be treated
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// as x coordinates and the odd indices will be treated as y coordinates.
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CanvasKit.SkPath.prototype.addPoly = function(points, close) {
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var ptr;
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var n;
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// This was created with CanvasKit.Malloc, so assume the user has
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// already been filled with data.
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if (points['_ck']) {
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ptr = points.byteOffset;
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n = points.length/2;
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} else {
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ptr = copy2dArray(points, CanvasKit.HEAPF32);
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n = points.length;
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}
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this._addPoly(ptr, n, close);
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CanvasKit._free(ptr);
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return this;
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};
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CanvasKit.SkPath.prototype.addRect = function() {
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// Takes 1, 2, 4 or 5 args
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// - SkRect
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// - SkRect, isCCW
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// - left, top, right, bottom
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// - left, top, right, bottom, isCCW
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if (arguments.length === 1 || arguments.length === 2) {
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var r = arguments[0];
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var ccw = arguments[1] || false;
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this._addRect(r.fLeft, r.fTop, r.fRight, r.fBottom, ccw);
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} else if (arguments.length === 4 || arguments.length === 5) {
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var a = arguments;
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this._addRect(a[0], a[1], a[2], a[3], a[4] || false);
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} else {
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SkDebug('addRect expected to take 1, 2, 4, or 5 args. Got ' + arguments.length);
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return null;
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}
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return this;
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};
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CanvasKit.SkPath.prototype.addRoundRect = function() {
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// Takes 3, 4, 6 or 7 args
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// - SkRect, radii, ccw
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// - SkRect, rx, ry, ccw
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// - left, top, right, bottom, radii, ccw
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// - left, top, right, bottom, rx, ry, ccw
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var args = arguments;
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if (args.length === 3 || args.length === 6) {
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var radii = args[args.length-2];
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} else if (args.length === 6 || args.length === 7){
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// duplicate the given (rx, ry) pairs for each corner.
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var rx = args[args.length-3];
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var ry = args[args.length-2];
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var radii = [rx, ry, rx, ry, rx, ry, rx, ry];
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} else {
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SkDebug('addRoundRect expected to take 3, 4, 6, or 7 args. Got ' + args.length);
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return null;
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}
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if (radii.length !== 8) {
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SkDebug('addRoundRect needs 8 radii provided. Got ' + radii.length);
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return null;
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}
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var rptr = copy1dArray(radii, CanvasKit.HEAPF32);
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if (args.length === 3 || args.length === 4) {
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var r = args[0];
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var ccw = args[args.length - 1];
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this._addRoundRect(r.fLeft, r.fTop, r.fRight, r.fBottom, rptr, ccw);
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} else if (args.length === 6 || args.length === 7) {
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var a = args;
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this._addRoundRect(a[0], a[1], a[2], a[3], rptr, ccw);
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}
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CanvasKit._free(rptr);
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return this;
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};
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CanvasKit.SkPath.prototype.arc = function(x, y, radius, startAngle, endAngle, ccw) {
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// emulates the HTMLCanvas behavior. See addArc() for the SkPath version.
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// Note input angles are radians.
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var bounds = CanvasKit.LTRBRect(x-radius, y-radius, x+radius, y+radius);
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var sweep = radiansToDegrees(endAngle - startAngle) - (360 * !!ccw);
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var temp = new CanvasKit.SkPath();
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temp.addArc(bounds, radiansToDegrees(startAngle), sweep);
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this.addPath(temp, true);
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temp.delete();
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return this;
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};
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CanvasKit.SkPath.prototype.arcTo = function() {
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// takes 4, 5 or 7 args
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// - 5 x1, y1, x2, y2, radius
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// - 4 oval (as Rect), startAngle, sweepAngle, forceMoveTo
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// - 7 rx, ry, xAxisRotate, useSmallArc, isCCW, x, y
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var args = arguments;
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if (args.length === 5) {
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this._arcTo(args[0], args[1], args[2], args[3], args[4]);
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} else if (args.length === 4) {
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this._arcTo(args[0], args[1], args[2], args[3]);
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} else if (args.length === 7) {
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this._arcTo(args[0], args[1], args[2], !!args[3], !!args[4], args[5], args[6]);
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} else {
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throw 'Invalid args for arcTo. Expected 4, 5, or 7, got '+ args.length;
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}
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return this;
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};
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CanvasKit.SkPath.prototype.close = function() {
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this._close();
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return this;
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};
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CanvasKit.SkPath.prototype.conicTo = function(x1, y1, x2, y2, w) {
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this._conicTo(x1, y1, x2, y2, w);
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return this;
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};
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CanvasKit.SkPath.prototype.cubicTo = function(cp1x, cp1y, cp2x, cp2y, x, y) {
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this._cubicTo(cp1x, cp1y, cp2x, cp2y, x, y);
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return this;
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};
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CanvasKit.SkPath.prototype.dash = function(on, off, phase) {
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if (this._dash(on, off, phase)) {
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return this;
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}
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return null;
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};
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CanvasKit.SkPath.prototype.lineTo = function(x, y) {
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this._lineTo(x, y);
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return this;
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};
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CanvasKit.SkPath.prototype.moveTo = function(x, y) {
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this._moveTo(x, y);
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return this;
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};
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CanvasKit.SkPath.prototype.offset = function(dx, dy) {
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this._transform(1, 0, dx,
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0, 1, dy,
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0, 0, 1);
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return this;
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};
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CanvasKit.SkPath.prototype.op = function(otherPath, op) {
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if (this._op(otherPath, op)) {
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return this;
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}
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return null;
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};
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CanvasKit.SkPath.prototype.quadTo = function(cpx, cpy, x, y) {
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this._quadTo(cpx, cpy, x, y);
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return this;
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};
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CanvasKit.SkPath.prototype.rArcTo = function(rx, ry, xAxisRotate, useSmallArc, isCCW, dx, dy) {
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this._rArcTo(rx, ry, xAxisRotate, useSmallArc, isCCW, dx, dy);
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return this;
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};
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CanvasKit.SkPath.prototype.rConicTo = function(dx1, dy1, dx2, dy2, w) {
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this._rConicTo(dx1, dy1, dx2, dy2, w);
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return this;
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};
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// These params are all relative
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CanvasKit.SkPath.prototype.rCubicTo = function(cp1x, cp1y, cp2x, cp2y, x, y) {
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this._rCubicTo(cp1x, cp1y, cp2x, cp2y, x, y);
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return this;
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};
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CanvasKit.SkPath.prototype.rLineTo = function(dx, dy) {
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this._rLineTo(dx, dy);
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return this;
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};
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CanvasKit.SkPath.prototype.rMoveTo = function(dx, dy) {
|
|
this._rMoveTo(dx, dy);
|
|
return this;
|
|
};
|
|
|
|
// These params are all relative
|
|
CanvasKit.SkPath.prototype.rQuadTo = function(cpx, cpy, x, y) {
|
|
this._rQuadTo(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);
|
|
}
|
|
|
|
}
|
|
|
|
// points is either an array of [x, y] where x and y are numbers or
|
|
// a typed array from Malloc where the even indices will be treated
|
|
// as x coordinates and the odd indices will be treated as y coordinates.
|
|
CanvasKit.SkCanvas.prototype.drawPoints = function(mode, points, paint) {
|
|
var ptr;
|
|
var n;
|
|
// This was created with CanvasKit.Malloc, so assume the user has
|
|
// already been filled with data.
|
|
if (points['_ck']) {
|
|
ptr = points.byteOffset;
|
|
n = points.length/2;
|
|
} else {
|
|
ptr = copy2dArray(points, CanvasKit.HEAPF32);
|
|
n = points.length;
|
|
}
|
|
this._drawPoints(mode, ptr, n, paint);
|
|
CanvasKit._free(ptr);
|
|
}
|
|
|
|
// 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 must be a Uint8Array with bytes representing the pixel values
|
|
// (e.g. each set of 4 bytes could represent RGBA values for a single pixel).
|
|
CanvasKit.MakeImage = function(pixels, width, height, alphaType, colorType) {
|
|
var bytesPerPixel = pixels.length / (width * height);
|
|
var info = {
|
|
'width': width,
|
|
'height': height,
|
|
'alphaType': alphaType,
|
|
'colorType': colorType,
|
|
};
|
|
var pptr = copy1dArray(pixels, CanvasKit.HEAPU8);
|
|
// No need to _free pptr, Image takes it with SkData::MakeFromMalloc
|
|
|
|
return CanvasKit._MakeImage(info, pptr, pixels.length, 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();
|
|
};
|