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301 lines
12 KiB
301 lines
12 KiB
(function(CanvasKit){
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CanvasKit._extraInitializations = CanvasKit._extraInitializations || [];
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CanvasKit._extraInitializations.push(function() {
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CanvasKit.Paragraph.prototype.getRectsForRange = function(start, end, hStyle, wStyle) {
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/**
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* This is bytes, but we'll want to think about them as float32s
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* @type {Float32Array}
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*/
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var floatArray = this._getRectsForRange(start, end, hStyle, wStyle);
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return floatArrayToRects(floatArray);
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}
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CanvasKit.Paragraph.prototype.getRectsForPlaceholders = function() {
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/**
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* This is bytes, but we'll want to think about them as float32s
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* @type {Float32Array}
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*/
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var floatArray = this._getRectsForPlaceholders();
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return floatArrayToRects(floatArray);
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}
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function floatArrayToRects(floatArray) {
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if (!floatArray || !floatArray.length) {
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return [];
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}
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var ret = [];
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for (var i = 0; i < floatArray.length; i+=5) {
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var r = CanvasKit.LTRBRect(floatArray[i], floatArray[i+1], floatArray[i+2], floatArray[i+3]);
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if (floatArray[i+4] === 0) {
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r['direction'] = CanvasKit.TextDirection.RTL;
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} else {
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r['direction'] = CanvasKit.TextDirection.LTR;
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}
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ret.push(r);
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}
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CanvasKit._free(floatArray.byteOffset);
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return ret;
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}
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// Registers the font (provided as an arrayBuffer) with the alias `family`.
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CanvasKit.TypefaceFontProvider.prototype.registerFont = function(font, family) {
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var typeface = CanvasKit.FontMgr.RefDefault().MakeTypefaceFromData(font);
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if (!typeface) {
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Debug('Could not decode font data');
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// We do not need to free the data since the C++ will do that for us
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// when the font is deleted (or fails to decode);
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return null;
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}
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var familyPtr = cacheOrCopyString(family);
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this._registerFont(typeface, familyPtr);
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}
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// These helpers fill out all fields, because emscripten complains if we
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// have undefined and it expects, for example, a float.
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// TODO(kjlubick) For efficiency, we should probably just return opaque WASM objects so we do
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// not have to keep copying them across the wire.
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CanvasKit.ParagraphStyle = function(s) {
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// Use [''] to tell closure not to minify the names
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s['disableHinting'] = s['disableHinting'] || false;
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if (s['ellipsis']) {
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var str = s['ellipsis'];
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s['_ellipsisPtr'] = cacheOrCopyString(str);
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s['_ellipsisLen'] = lengthBytesUTF8(str) + 1; // add 1 for the null terminator.
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} else {
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s['_ellipsisPtr'] = nullptr;
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s['_ellipsisLen'] = 0;
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}
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s['heightMultiplier'] = s['heightMultiplier'] || 0;
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s['maxLines'] = s['maxLines'] || 0;
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s['strutStyle'] = strutStyle(s['strutStyle']);
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s['textAlign'] = s['textAlign'] || CanvasKit.TextAlign.Start;
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s['textDirection'] = s['textDirection'] || CanvasKit.TextDirection.LTR;
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s['textHeightBehavior'] = s['textHeightBehavior'] || CanvasKit.TextHeightBehavior.All;
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s['textStyle'] = CanvasKit.TextStyle(s['textStyle']);
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return s;
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};
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function fontStyle(s) {
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s = s || {};
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// Can't check for falsey as 0 width means "invisible".
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if (s['weight'] === undefined) {
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s['weight'] = CanvasKit.FontWeight.Normal;
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}
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s['width'] = s['width'] || CanvasKit.FontWidth.Normal;
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s['slant'] = s['slant'] || CanvasKit.FontSlant.Upright;
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return s;
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}
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function strutStyle(s) {
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s = s || {};
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s['strutEnabled'] = s['strutEnabled'] || false;
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if (s['strutEnabled'] && Array.isArray(s['fontFamilies']) && s['fontFamilies'].length) {
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s['_fontFamiliesPtr'] = naiveCopyStrArray(s['fontFamilies']);
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s['_fontFamiliesLen'] = s['fontFamilies'].length;
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} else {
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s['_fontFamiliesPtr'] = nullptr;
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s['_fontFamiliesLen'] = 0;
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}
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s['fontStyle'] = fontStyle(s['fontStyle']);
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s['fontSize'] = s['fontSize'] || 0;
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s['heightMultiplier'] = s['heightMultiplier'] || 0;
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s['halfLeading'] = s['halfLeading'] || false;
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s['leading'] = s['leading'] || 0;
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s['forceStrutHeight'] = s['forceStrutHeight'] || false;
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return s;
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}
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CanvasKit.TextStyle = function(s) {
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// Use [''] to tell closure not to minify the names
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if (!s['color']) {
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s['color'] = CanvasKit.BLACK;
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}
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s['decoration'] = s['decoration'] || 0;
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s['decorationThickness'] = s['decorationThickness'] || 0;
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s['decorationStyle'] = s['decorationStyle'] || CanvasKit.DecorationStyle.Solid;
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s['textBaseline'] = s['textBaseline'] || CanvasKit.TextBaseline.Alphabetic;
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s['fontSize'] = s['fontSize'] || 0;
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s['letterSpacing'] = s['letterSpacing'] || 0;
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s['wordSpacing'] = s['wordSpacing'] || 0;
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s['heightMultiplier'] = s['heightMultiplier'] || 0;
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s['halfLeading'] = s['halfLeading'] || false;
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if (s['locale']) {
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var str = s['locale'];
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s['_localePtr'] = cacheOrCopyString(str);
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s['_localeLen'] = lengthBytesUTF8(str) + 1; // add 1 for the null terminator.
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} else {
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s['_localePtr'] = nullptr;
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s['_localeLen'] = 0;
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}
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s['fontStyle'] = fontStyle(s['fontStyle']);
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if (s['shadows']) {
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var shadows = s['shadows'];
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var shadowColors = shadows.map(function(s) { return s['color'] || CanvasKit.BLACK; });
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var shadowBlurRadii = shadows.map(function(s) { return s['blurRadius'] || 0.0; });
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s['_shadowLen'] = shadows.length;
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var ptr = CanvasKit._malloc(shadows.length * 2, 'HEAPF32');
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var adjustedPtr = ptr / 4; // 4 bytes per float
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for (var i = 0; i < shadows.length; i++) {
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var offset = shadows[i]['offset'] || [0, 0];
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CanvasKit.HEAPF32[adjustedPtr] = offset[0];
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CanvasKit.HEAPF32[adjustedPtr + 1] = offset[1];
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adjustedPtr += 2;
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}
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s['_shadowColorsPtr'] = copyFlexibleColorArray(shadowColors).colorPtr;
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s['_shadowOffsetsPtr'] = ptr;
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s['_shadowBlurRadiiPtr'] = copy1dArray(shadowBlurRadii, 'HEAPF32');
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} else {
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s['_shadowLen'] = 0;
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s['_shadowColorsPtr'] = nullptr;
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s['_shadowOffsetsPtr'] = nullptr;
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s['_shadowBlurRadiiPtr'] = nullptr;
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}
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if (s['fontFeatures']) {
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var fontFeatures = s['fontFeatures'];
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var fontFeatureNames = fontFeatures.map(function(s) { return s['name']; });
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var fontFeatureValues = fontFeatures.map(function(s) { return s['value']; });
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s['_fontFeatureLen'] = fontFeatures.length;
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s['_fontFeatureNamesPtr'] = naiveCopyStrArray(fontFeatureNames);
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s['_fontFeatureValuesPtr'] = copy1dArray(fontFeatureValues, 'HEAPU32');
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} else {
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s['_fontFeatureLen'] = 0;
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s['_fontFeatureNamesPtr'] = nullptr;
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s['_fontFeatureValuesPtr'] = nullptr;
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}
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return s;
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};
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// returns a pointer to a place on the heap that has an array
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// of char* (effectively a char**). For now, this does the naive thing
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// and depends on the string being null-terminated. This should be used
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// for simple, well-formed things (e.g. font-families), not arbitrary
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// text that should be drawn. If we need this to handle more complex
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// strings, it should return two pointers, a pointer of the
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// string array and a pointer to an array of the strings byte lengths.
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function naiveCopyStrArray(strings) {
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if (!strings || !strings.length) {
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return nullptr;
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}
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var sPtrs = [];
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for (var i = 0; i < strings.length; i++) {
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var strPtr = cacheOrCopyString(strings[i]);
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sPtrs.push(strPtr);
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}
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return copy1dArray(sPtrs, 'HEAPU32');
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}
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// maps string -> malloc'd pointer
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var stringCache = {};
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// cacheOrCopyString copies a string from JS into WASM on the heap and returns the pointer
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// to the memory of the string. It is expected that a caller to this helper will *not* free
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// that memory, so it is cached. Thus, if a future call to this function with the same string
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// will return the cached pointer, preventing the memory usage from growing unbounded (in
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// a normal use case).
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function cacheOrCopyString(str) {
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if (stringCache[str]) {
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return stringCache[str];
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}
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// Add 1 for null terminator, which we need when copying/converting
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var strLen = lengthBytesUTF8(str) + 1;
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var strPtr = CanvasKit._malloc(strLen);
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stringToUTF8(str, strPtr, strLen);
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stringCache[str] = strPtr;
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return strPtr;
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}
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// These scratch arrays are allocated once to copy the color data into, which saves us
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// having to free them after every invocation.
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var scratchForegroundColorPtr = CanvasKit._malloc(4 * 4); // room for 4 32bit floats
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var scratchBackgroundColorPtr = CanvasKit._malloc(4 * 4); // room for 4 32bit floats
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var scratchDecorationColorPtr = CanvasKit._malloc(4 * 4); // room for 4 32bit floats
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function copyArrays(textStyle) {
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// These color fields were arrays, but will set to WASM pointers before we pass this
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// object over the WASM interface.
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textStyle['_colorPtr'] = copyColorToWasm(textStyle['color']);
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textStyle['_foregroundColorPtr'] = nullptr; // nullptr is 0, from helper.js
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textStyle['_backgroundColorPtr'] = nullptr;
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textStyle['_decorationColorPtr'] = nullptr;
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if (textStyle['foregroundColor']) {
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textStyle['_foregroundColorPtr'] = copyColorToWasm(textStyle['foregroundColor'], scratchForegroundColorPtr);
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}
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if (textStyle['backgroundColor']) {
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textStyle['_backgroundColorPtr'] = copyColorToWasm(textStyle['backgroundColor'], scratchBackgroundColorPtr);
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}
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if (textStyle['decorationColor']) {
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textStyle['_decorationColorPtr'] = copyColorToWasm(textStyle['decorationColor'], scratchDecorationColorPtr);
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}
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if (Array.isArray(textStyle['fontFamilies']) && textStyle['fontFamilies'].length) {
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textStyle['_fontFamiliesPtr'] = naiveCopyStrArray(textStyle['fontFamilies']);
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textStyle['_fontFamiliesLen'] = textStyle['fontFamilies'].length;
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} else {
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textStyle['_fontFamiliesPtr'] = nullptr;
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textStyle['_fontFamiliesLen'] = 0;
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Debug('no font families provided, text may draw wrong or not at all');
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}
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}
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function freeArrays(textStyle) {
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// The font family strings will get copied to a vector on the C++ side, which is owned by
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// the text style.
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CanvasKit._free(textStyle['_fontFamiliesPtr']);
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}
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CanvasKit.ParagraphBuilder.Make = function(paragraphStyle, fontManager) {
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copyArrays(paragraphStyle['textStyle']);
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var result = CanvasKit.ParagraphBuilder._Make(paragraphStyle, fontManager);
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freeArrays(paragraphStyle['textStyle']);
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return result;
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};
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CanvasKit.ParagraphBuilder.MakeFromFontProvider = function(paragraphStyle, fontProvider) {
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copyArrays(paragraphStyle['textStyle']);
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var result = CanvasKit.ParagraphBuilder._MakeFromFontProvider(paragraphStyle, fontProvider);
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freeArrays(paragraphStyle['textStyle']);
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return result;
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};
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CanvasKit.ParagraphBuilder.ShapeText = function(text, blocks, width) {
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let length = 0;
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for (const b of blocks) {
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length += b.length;
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}
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if (length !== text.length) {
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throw "Accumulated block lengths must equal text.length";
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}
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return CanvasKit.ParagraphBuilder._ShapeText(text, blocks, width);
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};
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CanvasKit.ParagraphBuilder.prototype.pushStyle = function(textStyle) {
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copyArrays(textStyle);
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this._pushStyle(textStyle);
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freeArrays(textStyle);
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};
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CanvasKit.ParagraphBuilder.prototype.pushPaintStyle = function(textStyle, fg, bg) {
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copyArrays(textStyle);
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this._pushPaintStyle(textStyle, fg, bg);
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freeArrays(textStyle);
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};
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CanvasKit.ParagraphBuilder.prototype.addPlaceholder =
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function(width, height, alignment, baseline, offset) {
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width = width || 0;
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height = height || 0;
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alignment = alignment || CanvasKit.PlaceholderAlignment.Baseline;
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baseline = baseline || CanvasKit.TextBaseline.Alphabetic;
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offset = offset || 0;
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this._addPlaceholder(width, height, alignment, baseline, offset);
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};
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});
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}(Module)); // When this file is loaded in, the high level object is "Module";
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