modules/canvaskit/font.js - skia - Git at Google

 CanvasKit._extraInitializations = CanvasKit._extraInitializations || [];
 CanvasKit._extraInitializations.push(function() {

   // str can be either a text string or a ShapedText object
   CanvasKit.Canvas.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);
       CanvasKit._free(strPtr);
     } else {
       this._drawShapedText(str, x, y, paint);
     }
   };

   // Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
   // If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
   // The return value will be a Float32Array that is 4 times as long as the input array. For each
   // glyph, there will be 4 floats for left, top, right, bottom (relative to 0, 0) for that glyph.
   CanvasKit.Font.prototype.getGlyphBounds = function(glyphs, paint, optionalOutputArray) {
     var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
     var bytesPerRect = 4 * 4;
     var rectPtr = CanvasKit._malloc(glyphs.length * bytesPerRect);
     this._getGlyphWidthBounds(glyphPtr, glyphs.length, nullptr, rectPtr, paint || null);

     var rects = new Float32Array(CanvasKit.HEAPU8.buffer, rectPtr, glyphs.length * 4);
     freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
     if (optionalOutputArray) {
       optionalOutputArray.set(rects);
       CanvasKit._free(rectPtr);
       return optionalOutputArray;
     }
     var rv = Float32Array.from(rects);
     CanvasKit._free(rectPtr);
     return rv;
   };

   CanvasKit.Font.prototype.getGlyphIDs = function(str, numGlyphIDs, optionalOutputArray) {
     if (!numGlyphIDs) {
       numGlyphIDs = str.length;
     }
     // 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); // This includes the null terminator

     var bytesPerGlyph = 2;
     var glyphPtr = CanvasKit._malloc(numGlyphIDs * bytesPerGlyph);
     // We don't need to compute the id for the null terminator, so subtract 1.
     var actualIDs = this._getGlyphIDs(strPtr, strBytes - 1, numGlyphIDs, glyphPtr);
     CanvasKit._free(strPtr);
     if (actualIDs < 0) {
       Debug('Could not get glyphIDs');
       CanvasKit._free(glyphPtr);
       return null;
     }
     var glyphs = new Uint16Array(CanvasKit.HEAPU8.buffer, glyphPtr, actualIDs);
     if (optionalOutputArray) {
       optionalOutputArray.set(glyphs);
       CanvasKit._free(glyphPtr);
       return optionalOutputArray;
     }
     var rv = Uint32Array.from(glyphs);
     CanvasKit._free(glyphPtr);
     return rv;
   };

   // Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
   // If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
   // The return value will be a Float32Array that has one width per input glyph.
   CanvasKit.Font.prototype.getGlyphWidths = function(glyphs, paint, optionalOutputArray) {
     var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
     var bytesPerWidth = 4;
     var widthPtr = CanvasKit._malloc(glyphs.length * bytesPerWidth);
     this._getGlyphWidthBounds(glyphPtr, glyphs.length, widthPtr, nullptr, paint || null);

     var widths = new Float32Array(CanvasKit.HEAPU8.buffer, widthPtr, glyphs.length);
     freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
     if (optionalOutputArray) {
       optionalOutputArray.set(widths);
       CanvasKit._free(widthPtr);
       return optionalOutputArray;
     }
     var rv = Float32Array.from(widths);
     CanvasKit._free(widthPtr);
     return rv;
   };

   // Returns an array of the widths of the glyphs in this string.
   // TODO(kjlubick) Remove this API - getGlyphWidths is the better API.
   CanvasKit.Font.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)) {
       Debug('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.HEAPU8.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.FontMgr.FromData = function() {
     if (!arguments.length) {
       Debug('Could not make FontMgr from no font sources');
       return null;
     }
     var fonts = arguments;
     if (fonts.length === 1 && Array.isArray(fonts[0])) {
       fonts = arguments[0];
     }
     if (!fonts.length) {
       Debug('Could not make FontMgr 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, 'HEAPU8');
       dPtrs.push(dptr);
       sizes.push(data.byteLength);
     }
     // Pointers are 32 bit unsigned ints
     var datasPtr = copy1dArray(dPtrs, 'HEAPU32');
     var sizesPtr = copy1dArray(sizes, 'HEAPU32');
     var fm = CanvasKit.FontMgr._fromData(datasPtr, sizesPtr, fonts.length);
     // The FontMgr 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.FontMgr.prototype.MakeTypefaceFromData = function(fontData) {
     var data = new Uint8Array(fontData);

     var fptr = copy1dArray(data, 'HEAPU8');
     var font = this._makeTypefaceFromData(fptr, data.byteLength);
     if (!font) {
       Debug('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;
   };

   // Clients can pass in a Float32Array with length 4 to this and the results
   // will be copied into that array. Otherwise, a new TypedArray will be allocated
   // and returned.
   CanvasKit.ShapedText.prototype.getBounds = function(optionalOutputArray) {
     this._getBounds(_scratchFourFloatsAPtr);
     var ta = _scratchFourFloatsA['toTypedArray']();
     if (optionalOutputArray) {
       optionalOutputArray.set(ta);
       return optionalOutputArray;
     }
     return ta.slice();
   };

   CanvasKit.TextBlob.MakeOnPath = function(str, path, font, initialOffset) {
     if (!str || !str.length) {
       Debug('ignoring 0 length string');
       return;
     }
     if (!path || !path.countPoints()) {
       Debug('ignoring empty path');
       return;
     }
     if (path.countPoints() === 1) {
       Debug('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.ContourMeasureIter(path, false, 1);
     var cont = meas.next();
     var dist = initialOffset;
     var xycs = new Float32Array(4);
     for (var i = 0; i < str.length && cont; i++) {
       var width = widths[i];
       dist += width/2;
       if (dist > cont.length()) {
         // jump to next contour
         cont.delete();
         cont = meas.next();
         if (!cont) {
           // 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.
       cont.getPosTan(dist, xycs);
       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();
     cont && cont.delete();
     meas.delete();
     return retVal;
   };

   CanvasKit.TextBlob.MakeFromRSXform = function(str, rsxBuilderOrArray, 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 = nullptr;
     if (rsxBuilderOrArray.build) {
       rPtr = rsxBuilderOrArray.build();
     } else {
       rPtr = copy1dArray(rsxBuilderOrArray, 'HEAPF32');
     }

     var blob = CanvasKit.TextBlob._MakeFromRSXform(strPtr, strLen - 1, rPtr, font);
     CanvasKit._free(strPtr);
     if (!blob) {
       Debug('Could not make textblob from string "' + str + '"');
       return null;
     }
     return blob;
   };

   // Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
   // If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
   CanvasKit.TextBlob.MakeFromRSXformGlyphs = function(glyphs, rsxBuilderOrArray, font) {
     // Currently on the C++ side, glyph ids are 16bit, but there is an effort to change that.
     var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
     var bytesPerGlyph = 2;

     var rPtr = nullptr;
     if (rsxBuilderOrArray.build) {
       rPtr = rsxBuilderOrArray.build();
     } else {
       rPtr = copy1dArray(rsxBuilderOrArray, 'HEAPF32');
     }

     var blob = CanvasKit.TextBlob._MakeFromRSXformGlyphs(glyphPtr, glyphs.length * bytesPerGlyph, rPtr, font);
     freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
     if (!blob) {
       Debug('Could not make textblob from glyphs "' + glyphs + '"');
       return null;
     }
     return blob;
   };

   // Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
   // If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
   CanvasKit.TextBlob.MakeFromGlyphs = function(glyphs, font) {
     // Currently on the C++ side, glyph ids are 16bit, but there is an effort to change that.
     var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
     var bytesPerGlyph = 2;
     var blob = CanvasKit.TextBlob._MakeFromGlyphs(glyphPtr, glyphs.length * bytesPerGlyph, font);
     freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
     if (!blob) {
       Debug('Could not make textblob from glyphs "' + glyphs + '"');
       return null;
     }
     return blob;
   };

   CanvasKit.TextBlob.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.TextBlob._MakeFromText(strPtr, strLen - 1, font);
     CanvasKit._free(strPtr);
     if (!blob) {
       Debug('Could not make textblob from string "' + str + '"');
       return null;
     }
     return blob;
   };

   // A helper to return the right type for GlyphIDs stored internally. When that changes, this
   // will also be changed, which will help avoid future breakages.
   CanvasKit.MallocGlyphIDs = function(numGlyphIDs) {
     return CanvasKit.Malloc(Uint16Array, numGlyphIDs);
   }
 });
	CanvasKit._extraInitializations = CanvasKit._extraInitializations \|\| [];
	CanvasKit._extraInitializations.push(function() {

	// str can be either a text string or a ShapedText object
	CanvasKit.Canvas.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);
	CanvasKit._free(strPtr);
	} else {
	this._drawShapedText(str, x, y, paint);
	}
	};

	// Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
	// If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
	// The return value will be a Float32Array that is 4 times as long as the input array. For each
	// glyph, there will be 4 floats for left, top, right, bottom (relative to 0, 0) for that glyph.
	CanvasKit.Font.prototype.getGlyphBounds = function(glyphs, paint, optionalOutputArray) {
	var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
	var bytesPerRect = 4 * 4;
	var rectPtr = CanvasKit._malloc(glyphs.length * bytesPerRect);
	this._getGlyphWidthBounds(glyphPtr, glyphs.length, nullptr, rectPtr, paint \|\| null);

	var rects = new Float32Array(CanvasKit.HEAPU8.buffer, rectPtr, glyphs.length * 4);
	freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
	if (optionalOutputArray) {
	optionalOutputArray.set(rects);
	CanvasKit._free(rectPtr);
	return optionalOutputArray;
	}
	var rv = Float32Array.from(rects);
	CanvasKit._free(rectPtr);
	return rv;
	};

	CanvasKit.Font.prototype.getGlyphIDs = function(str, numGlyphIDs, optionalOutputArray) {
	if (!numGlyphIDs) {
	numGlyphIDs = str.length;
	}
	// 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); // This includes the null terminator

	var bytesPerGlyph = 2;
	var glyphPtr = CanvasKit._malloc(numGlyphIDs * bytesPerGlyph);
	// We don't need to compute the id for the null terminator, so subtract 1.
	var actualIDs = this._getGlyphIDs(strPtr, strBytes - 1, numGlyphIDs, glyphPtr);
	CanvasKit._free(strPtr);
	if (actualIDs < 0) {
	Debug('Could not get glyphIDs');
	CanvasKit._free(glyphPtr);
	return null;
	}
	var glyphs = new Uint16Array(CanvasKit.HEAPU8.buffer, glyphPtr, actualIDs);
	if (optionalOutputArray) {
	optionalOutputArray.set(glyphs);
	CanvasKit._free(glyphPtr);
	return optionalOutputArray;
	}
	var rv = Uint32Array.from(glyphs);
	CanvasKit._free(glyphPtr);
	return rv;
	};

	// Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
	// If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
	// The return value will be a Float32Array that has one width per input glyph.
	CanvasKit.Font.prototype.getGlyphWidths = function(glyphs, paint, optionalOutputArray) {
	var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
	var bytesPerWidth = 4;
	var widthPtr = CanvasKit._malloc(glyphs.length * bytesPerWidth);
	this._getGlyphWidthBounds(glyphPtr, glyphs.length, widthPtr, nullptr, paint \|\| null);

	var widths = new Float32Array(CanvasKit.HEAPU8.buffer, widthPtr, glyphs.length);
	freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
	if (optionalOutputArray) {
	optionalOutputArray.set(widths);
	CanvasKit._free(widthPtr);
	return optionalOutputArray;
	}
	var rv = Float32Array.from(widths);
	CanvasKit._free(widthPtr);
	return rv;
	};

	// Returns an array of the widths of the glyphs in this string.
	// TODO(kjlubick) Remove this API - getGlyphWidths is the better API.
	CanvasKit.Font.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)) {
	Debug('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.HEAPU8.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.FontMgr.FromData = function() {
	if (!arguments.length) {
	Debug('Could not make FontMgr from no font sources');
	return null;
	}
	var fonts = arguments;
	if (fonts.length === 1 && Array.isArray(fonts[0])) {
	fonts = arguments[0];
	}
	if (!fonts.length) {
	Debug('Could not make FontMgr 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, 'HEAPU8');
	dPtrs.push(dptr);
	sizes.push(data.byteLength);
	}
	// Pointers are 32 bit unsigned ints
	var datasPtr = copy1dArray(dPtrs, 'HEAPU32');
	var sizesPtr = copy1dArray(sizes, 'HEAPU32');
	var fm = CanvasKit.FontMgr._fromData(datasPtr, sizesPtr, fonts.length);
	// The FontMgr 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.FontMgr.prototype.MakeTypefaceFromData = function(fontData) {
	var data = new Uint8Array(fontData);

	var fptr = copy1dArray(data, 'HEAPU8');
	var font = this._makeTypefaceFromData(fptr, data.byteLength);
	if (!font) {
	Debug('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;
	};

	// Clients can pass in a Float32Array with length 4 to this and the results
	// will be copied into that array. Otherwise, a new TypedArray will be allocated
	// and returned.
	CanvasKit.ShapedText.prototype.getBounds = function(optionalOutputArray) {
	this._getBounds(_scratchFourFloatsAPtr);
	var ta = _scratchFourFloatsA['toTypedArray']();
	if (optionalOutputArray) {
	optionalOutputArray.set(ta);
	return optionalOutputArray;
	}
	return ta.slice();
	};

	CanvasKit.TextBlob.MakeOnPath = function(str, path, font, initialOffset) {
	if (!str \|\| !str.length) {
	Debug('ignoring 0 length string');
	return;
	}
	if (!path \|\| !path.countPoints()) {
	Debug('ignoring empty path');
	return;
	}
	if (path.countPoints() === 1) {
	Debug('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.ContourMeasureIter(path, false, 1);
	var cont = meas.next();
	var dist = initialOffset;
	var xycs = new Float32Array(4);
	for (var i = 0; i < str.length && cont; i++) {
	var width = widths[i];
	dist += width/2;
	if (dist > cont.length()) {
	// jump to next contour
	cont.delete();
	cont = meas.next();
	if (!cont) {
	// 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.
	cont.getPosTan(dist, xycs);
	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();
	cont && cont.delete();
	meas.delete();
	return retVal;
	};

	CanvasKit.TextBlob.MakeFromRSXform = function(str, rsxBuilderOrArray, 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 = nullptr;
	if (rsxBuilderOrArray.build) {
	rPtr = rsxBuilderOrArray.build();
	} else {
	rPtr = copy1dArray(rsxBuilderOrArray, 'HEAPF32');
	}

	var blob = CanvasKit.TextBlob._MakeFromRSXform(strPtr, strLen - 1, rPtr, font);
	CanvasKit._free(strPtr);
	if (!blob) {
	Debug('Could not make textblob from string "' + str + '"');
	return null;
	}
	return blob;
	};

	// Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
	// If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
	CanvasKit.TextBlob.MakeFromRSXformGlyphs = function(glyphs, rsxBuilderOrArray, font) {
	// Currently on the C++ side, glyph ids are 16bit, but there is an effort to change that.
	var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
	var bytesPerGlyph = 2;

	var rPtr = nullptr;
	if (rsxBuilderOrArray.build) {
	rPtr = rsxBuilderOrArray.build();
	} else {
	rPtr = copy1dArray(rsxBuilderOrArray, 'HEAPF32');
	}

	var blob = CanvasKit.TextBlob._MakeFromRSXformGlyphs(glyphPtr, glyphs.length * bytesPerGlyph, rPtr, font);
	freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
	if (!blob) {
	Debug('Could not make textblob from glyphs "' + glyphs + '"');
	return null;
	}
	return blob;
	};

	// Glyphs should be a Uint32Array of glyph ids, e.g. provided by Font.getGlyphIDs.
	// If using a Malloc'd array, be sure to use CanvasKit.MallocGlyphIDs() to get the right type.
	CanvasKit.TextBlob.MakeFromGlyphs = function(glyphs, font) {
	// Currently on the C++ side, glyph ids are 16bit, but there is an effort to change that.
	var glyphPtr = copy1dArray(glyphs, 'HEAPU16');
	var bytesPerGlyph = 2;
	var blob = CanvasKit.TextBlob._MakeFromGlyphs(glyphPtr, glyphs.length * bytesPerGlyph, font);
	freeArraysThatAreNotMallocedByUsers(glyphPtr, glyphs);
	if (!blob) {
	Debug('Could not make textblob from glyphs "' + glyphs + '"');
	return null;
	}
	return blob;
	};

	CanvasKit.TextBlob.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.TextBlob._MakeFromText(strPtr, strLen - 1, font);
	CanvasKit._free(strPtr);
	if (!blob) {
	Debug('Could not make textblob from string "' + str + '"');
	return null;
	}
	return blob;
	};

	// A helper to return the right type for GlyphIDs stored internally. When that changes, this
	// will also be changed, which will help avoid future breakages.
	CanvasKit.MallocGlyphIDs = function(numGlyphIDs) {
	return CanvasKit.Malloc(Uint16Array, numGlyphIDs);
	}
	});