Herb Derby | 09db9d2 | 2019-04-22 17:18:50 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
Mike Klein | ad44dd5 | 2019-05-14 14:01:39 -0500 | [diff] [blame] | 8 | #include "src/utils/SkShaperJSONWriter.h" |
Herb Derby | 09db9d2 | 2019-04-22 17:18:50 -0400 | [diff] [blame] | 9 | |
| 10 | #include <algorithm> |
| 11 | #include <limits> |
| 12 | #include <string> |
| 13 | |
| 14 | #include "src/utils/SkJSONWriter.h" |
| 15 | #include "src/utils/SkUTF.h" |
| 16 | |
| 17 | SkShaperJSONWriter::SkShaperJSONWriter(SkJSONWriter* JSONWriter, const char* utf8, size_t size) |
| 18 | : fJSONWriter{JSONWriter} |
| 19 | , fUTF8{utf8, size} {} |
| 20 | |
| 21 | void SkShaperJSONWriter::beginLine() { } |
| 22 | |
| 23 | void SkShaperJSONWriter::runInfo(const SkShaper::RunHandler::RunInfo& info) { } |
| 24 | |
| 25 | void SkShaperJSONWriter::commitRunInfo() { } |
| 26 | |
| 27 | SkShaper::RunHandler::Buffer |
| 28 | SkShaperJSONWriter::runBuffer(const SkShaper::RunHandler::RunInfo& info) { |
| 29 | fGlyphs.resize(info.glyphCount); |
| 30 | fPositions.resize(info.glyphCount); |
| 31 | fClusters.resize(info.glyphCount); |
| 32 | return {fGlyphs.data(), fPositions.data(), nullptr, fClusters.data(), {0, 0}}; |
| 33 | } |
| 34 | |
| 35 | static bool is_one_to_one(const char utf8[], size_t utf8Begin, size_t utf8End, |
| 36 | std::vector<uint32_t>& clusters) { |
| 37 | size_t lastUtf8Index = utf8End; |
| 38 | |
| 39 | auto checkCluster = [&](size_t clusterIndex) { |
| 40 | if (clusters[clusterIndex] >= lastUtf8Index) { |
| 41 | return false; |
| 42 | } |
| 43 | size_t utf8ClusterSize = lastUtf8Index - clusters[clusterIndex]; |
| 44 | if (SkUTF::CountUTF8(&utf8[clusters[clusterIndex]], utf8ClusterSize) != 1) { |
| 45 | return false; |
| 46 | } |
| 47 | lastUtf8Index = clusters[clusterIndex]; |
| 48 | return true; |
| 49 | }; |
| 50 | |
| 51 | if (clusters.front() <= clusters.back()) { |
| 52 | // left-to-right clusters |
| 53 | size_t clusterCursor = clusters.size(); |
| 54 | while (clusterCursor > 0) { |
| 55 | if (!checkCluster(--clusterCursor)) { return false; } |
| 56 | } |
| 57 | } else { |
| 58 | // right-to-left clusters |
| 59 | size_t clusterCursor = 0; |
| 60 | while (clusterCursor < clusters.size()) { |
| 61 | if (!checkCluster(clusterCursor++)) { return false; } |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return true; |
| 66 | } |
| 67 | |
| 68 | void SkShaperJSONWriter::commitRunBuffer(const SkShaper::RunHandler::RunInfo& info) { |
| 69 | fJSONWriter->beginObject("run", true); |
| 70 | |
| 71 | // Font name |
| 72 | SkString fontName; |
| 73 | info.fFont.getTypeface()->getFamilyName(&fontName); |
| 74 | fJSONWriter->appendString("font name", fontName.c_str()); |
| 75 | |
| 76 | // Font size |
| 77 | fJSONWriter->appendFloat("font size", info.fFont.getSize()); |
| 78 | |
| 79 | if (info.fBidiLevel > 0) { |
| 80 | std::string bidiType = info.fBidiLevel % 2 == 0 ? "left-to-right" : "right-to-left"; |
| 81 | std::string bidiOutput = bidiType + " lvl " + std::to_string(info.fBidiLevel); |
| 82 | fJSONWriter->appendString("BiDi", bidiOutput.c_str()); |
| 83 | } |
| 84 | |
| 85 | if (is_one_to_one(fUTF8.c_str(), info.utf8Range.begin(), info.utf8Range.end(), fClusters)) { |
| 86 | std::string utf8{&fUTF8[info.utf8Range.begin()], info.utf8Range.size()}; |
| 87 | fJSONWriter->appendString("UTF8", utf8.c_str()); |
| 88 | |
| 89 | fJSONWriter->beginArray("glyphs", false); |
| 90 | for (auto glyphID : fGlyphs) { |
| 91 | fJSONWriter->appendU32(glyphID); |
| 92 | } |
| 93 | fJSONWriter->endArray(); |
| 94 | |
| 95 | fJSONWriter->beginArray("clusters", false); |
| 96 | for (auto cluster : fClusters) { |
| 97 | fJSONWriter->appendU32(cluster); |
| 98 | } |
| 99 | fJSONWriter->endArray(); |
| 100 | } else { |
| 101 | VisualizeClusters(fUTF8.c_str(), |
| 102 | info.utf8Range.begin(), info.utf8Range.end(), |
Herb Derby | 9ee1edd | 2019-07-02 16:06:00 -0400 | [diff] [blame] | 103 | SkMakeSpan(fGlyphs), |
| 104 | SkMakeSpan(fClusters), |
Herb Derby | 09db9d2 | 2019-04-22 17:18:50 -0400 | [diff] [blame] | 105 | [this](size_t codePointCount, SkSpan<const char> utf1to1, |
| 106 | SkSpan<const SkGlyphID> glyph1to1) { |
| 107 | this->displayMToN(codePointCount, utf1to1, glyph1to1); |
| 108 | }); |
| 109 | } |
| 110 | |
| 111 | if (info.glyphCount > 1) { |
| 112 | fJSONWriter->beginArray("horizontal positions", false); |
| 113 | for (auto position : fPositions) { |
| 114 | fJSONWriter->appendFloat(position.x()); |
| 115 | } |
| 116 | fJSONWriter->endArray(); |
| 117 | } |
| 118 | |
| 119 | fJSONWriter->beginArray("advances", false); |
| 120 | for (size_t i = 1; i < info.glyphCount; i++) { |
| 121 | fJSONWriter->appendFloat(fPositions[i].fX - fPositions[i-1].fX); |
| 122 | } |
| 123 | SkPoint lastAdvance = info.fAdvance - (fPositions.back() - fPositions.front()); |
| 124 | fJSONWriter->appendFloat(lastAdvance.fX); |
| 125 | fJSONWriter->endArray(); |
| 126 | |
| 127 | fJSONWriter->endObject(); |
| 128 | } |
| 129 | |
| 130 | void SkShaperJSONWriter::BreakupClusters(size_t utf8Begin, size_t utf8End, |
| 131 | SkSpan<const uint32_t> clusters, |
| 132 | const BreakupCluastersCallback& processMToN) { |
| 133 | |
| 134 | if (clusters.front() <= clusters.back()) { |
| 135 | // Handle left-to-right text direction |
| 136 | size_t glyphStartIndex = 0; |
| 137 | for (size_t glyphEndIndex = 0; glyphEndIndex < clusters.size(); glyphEndIndex++) { |
| 138 | |
| 139 | if (clusters[glyphStartIndex] == clusters[glyphEndIndex]) { continue; } |
| 140 | |
| 141 | processMToN(glyphStartIndex, glyphEndIndex, |
| 142 | clusters[glyphStartIndex], clusters[glyphEndIndex]); |
| 143 | |
| 144 | glyphStartIndex = glyphEndIndex; |
| 145 | } |
| 146 | |
| 147 | processMToN(glyphStartIndex, clusters.size(), clusters[glyphStartIndex], utf8End); |
| 148 | |
| 149 | } else { |
| 150 | // Handle right-to-left text direction. |
| 151 | SkASSERT(clusters.size() >= 2); |
| 152 | size_t glyphStartIndex = 0; |
| 153 | uint32_t utf8EndIndex = utf8End; |
| 154 | for (size_t glyphEndIndex = 0; glyphEndIndex < clusters.size(); glyphEndIndex++) { |
| 155 | |
| 156 | if (clusters[glyphStartIndex] == clusters[glyphEndIndex]) { continue; } |
| 157 | |
| 158 | processMToN(glyphStartIndex, glyphEndIndex, |
| 159 | clusters[glyphStartIndex], utf8EndIndex); |
| 160 | |
| 161 | utf8EndIndex = clusters[glyphStartIndex]; |
| 162 | glyphStartIndex = glyphEndIndex; |
| 163 | } |
| 164 | processMToN(glyphStartIndex, clusters.size(), utf8Begin, clusters[glyphStartIndex-1]); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | void SkShaperJSONWriter::VisualizeClusters(const char* utf8, size_t utf8Begin, size_t utf8End, |
| 169 | SkSpan<const SkGlyphID> glyphIDs, |
| 170 | SkSpan<const uint32_t> clusters, |
| 171 | const VisualizeClustersCallback& processMToN) { |
| 172 | |
| 173 | size_t glyphRangeStart, glyphRangeEnd; |
| 174 | uint32_t utf8RangeStart, utf8RangeEnd; |
| 175 | |
| 176 | auto resetRanges = [&]() { |
| 177 | glyphRangeStart = std::numeric_limits<size_t>::max(); |
| 178 | glyphRangeEnd = 0; |
| 179 | utf8RangeStart = std::numeric_limits<uint32_t>::max(); |
| 180 | utf8RangeEnd = 0; |
| 181 | }; |
| 182 | |
| 183 | auto checkRangesAndProcess = [&]() { |
| 184 | if (glyphRangeStart < glyphRangeEnd) { |
| 185 | size_t glyphRangeCount = glyphRangeEnd - glyphRangeStart; |
| 186 | SkSpan<const char> utf8Span{&utf8[utf8RangeStart], utf8RangeEnd - utf8RangeStart}; |
| 187 | SkSpan<const SkGlyphID> glyphSpan{&glyphIDs[glyphRangeStart], glyphRangeCount}; |
| 188 | |
| 189 | // Glyph count is the same as codepoint count for 1:1. |
| 190 | processMToN(glyphRangeCount, utf8Span, glyphSpan); |
| 191 | } |
| 192 | resetRanges(); |
| 193 | }; |
| 194 | |
| 195 | auto gatherRuns = [&](size_t glyphStartIndex, size_t glyphEndIndex, |
| 196 | uint32_t utf8StartIndex, uint32_t utf8EndIndex) { |
| 197 | int possibleCount = SkUTF::CountUTF8(&utf8[utf8StartIndex], utf8EndIndex - utf8StartIndex); |
| 198 | if (possibleCount == -1) { return; } |
| 199 | size_t codePointCount = SkTo<size_t>(possibleCount); |
| 200 | if (codePointCount == 1 && glyphEndIndex - glyphStartIndex == 1) { |
| 201 | glyphRangeStart = std::min(glyphRangeStart, glyphStartIndex); |
| 202 | glyphRangeEnd = std::max(glyphRangeEnd, glyphEndIndex ); |
| 203 | utf8RangeStart = std::min(utf8RangeStart, utf8StartIndex ); |
| 204 | utf8RangeEnd = std::max(utf8RangeEnd, utf8EndIndex ); |
| 205 | } else { |
| 206 | checkRangesAndProcess(); |
| 207 | |
| 208 | SkSpan<const char> utf8Span{&utf8[utf8StartIndex], utf8EndIndex - utf8StartIndex}; |
| 209 | SkSpan<const SkGlyphID> glyphSpan{&glyphIDs[glyphStartIndex], |
| 210 | glyphEndIndex - glyphStartIndex}; |
| 211 | |
| 212 | processMToN(codePointCount, utf8Span, glyphSpan); |
| 213 | } |
| 214 | }; |
| 215 | |
| 216 | resetRanges(); |
| 217 | BreakupClusters(utf8Begin, utf8End, clusters, gatherRuns); |
| 218 | checkRangesAndProcess(); |
| 219 | } |
| 220 | |
| 221 | void SkShaperJSONWriter::displayMToN(size_t codePointCount, |
| 222 | SkSpan<const char> utf8, |
| 223 | SkSpan<const SkGlyphID> glyphIDs) { |
| 224 | std::string nString = std::to_string(codePointCount); |
| 225 | std::string mString = std::to_string(glyphIDs.size()); |
| 226 | std::string clusterName = "cluster " + nString + " to " + mString; |
| 227 | fJSONWriter->beginObject(clusterName.c_str(), true); |
| 228 | std::string utf8String{utf8.data(), utf8.size()}; |
| 229 | fJSONWriter->appendString("UTF", utf8String.c_str()); |
| 230 | fJSONWriter->beginArray("glyphsIDs", false); |
| 231 | for (auto glyphID : glyphIDs) { |
| 232 | fJSONWriter->appendU32(glyphID); |
| 233 | } |
| 234 | fJSONWriter->endArray(); |
| 235 | fJSONWriter->endObject(); |
| 236 | } |