skia2/fuzz/FuzzSkParagraph.cpp
Weston Tracey 3dd203d7bd [fuzzing] Paint SkParagraph.
Bug: skia:10894
Change-Id: I5663f126467a7ff9027955de4eee0fcc7967d94a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/367878
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Weston Tracey <westont@google.com>
2021-02-08 22:42:53 +00:00

283 lines
9.2 KiB
C++

/*
* Copyright 2020 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "fuzz/Fuzz.h"
#include "fuzz/FuzzCommon.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkEncodedImageFormat.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkImageEncoder.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkStream.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "modules/skparagraph/include/DartTypes.h"
#include "modules/skparagraph/include/FontCollection.h"
#include "modules/skparagraph/include/Paragraph.h"
#include "modules/skparagraph/include/ParagraphCache.h"
#include "modules/skparagraph/include/ParagraphStyle.h"
#include "modules/skparagraph/include/TextShadow.h"
#include "modules/skparagraph/include/TextStyle.h"
#include "modules/skparagraph/include/TypefaceFontProvider.h"
#include "modules/skparagraph/src/ParagraphBuilderImpl.h"
#include "modules/skparagraph/src/ParagraphImpl.h"
#include "modules/skparagraph/src/Run.h"
#include "modules/skparagraph/src/TextLine.h"
#include "modules/skparagraph/utils/TestFontCollection.h"
#include "src/core/SkOSFile.h"
#include "src/core/SkSpan.h"
#include "src/utils/SkOSPath.h"
#include "src/utils/SkShaperJSONWriter.h"
#include "tests/Test.h"
#include "tools/Resources.h"
#include <string.h>
#include <algorithm>
#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>
using namespace skia::textlayout;
namespace {
const uint8_t MAX_TEXT_LENGTH = 255;
const uint8_t MAX_TEXT_ADDITIONS = 4;
// Use 250 so uint8 can create text and layout width larger than the canvas.
const uint16_t TEST_CANVAS_DIM = 250;
class ResourceFontCollection : public FontCollection {
public:
ResourceFontCollection(bool testOnly = false)
: fFontsFound(false)
, fResolvedFonts(0)
, fResourceDir(GetResourcePath("fonts").c_str())
, fFontProvider(sk_make_sp<TypefaceFontProvider>()) {
std::vector<SkString> fonts;
SkOSFile::Iter iter(fResourceDir.c_str());
SkString path;
while (iter.next(&path)) {
if (path.endsWith("Roboto-Italic.ttf")) {
fFontsFound = true;
}
fonts.emplace_back(path);
}
if (!fFontsFound) {
// SkDebugf("Fonts not found, skipping all the tests\n");
return;
}
// Only register fonts if we have to
for (auto& font : fonts) {
SkString file_path;
file_path.printf("%s/%s", fResourceDir.c_str(), font.c_str());
fFontProvider->registerTypeface(SkTypeface::MakeFromFile(file_path.c_str()));
}
if (testOnly) {
this->setTestFontManager(std::move(fFontProvider));
} else {
this->setAssetFontManager(std::move(fFontProvider));
}
this->disableFontFallback();
}
size_t resolvedFonts() const { return fResolvedFonts; }
// TODO: temp solution until we check in fonts
bool fontsFound() const { return fFontsFound; }
private:
bool fFontsFound;
size_t fResolvedFonts;
std::string fResourceDir;
sk_sp<TypefaceFontProvider> fFontProvider;
};
// buffer must be at least MAX_TEXT_LENGTH in length.
// Returns size of text placed in buffer.
template <typename T>
uint8_t RandomText(T* buffer, Fuzz* fuzz) {
uint8_t text_length;
fuzz->nextRange(&text_length, 0, MAX_TEXT_LENGTH);
fuzz->nextN(buffer, text_length);
return text_length;
}
// Add random bytes to the paragraph.
void AddASCIIText(ParagraphBuilder* builder,Fuzz* fuzz) {
char text[MAX_TEXT_LENGTH];
const auto text_length = RandomText(text, fuzz);
builder->addText(text, text_length);
}
// Add random bytes to the paragraph.
void AddUnicodeText(ParagraphBuilder* builder,Fuzz* fuzz) {
char16_t text[MAX_TEXT_LENGTH];
const auto text_length = RandomText(text, fuzz);
builder->addText(std::u16string(text, text_length));
}
// Combining characters to produce 'Zalgo' text.
const std::u16string COMBINING_DOWN = u"\u0316\u0317\u0318\u0319\u031c\u031d\u031e\u031f\u0320\u0324\u0325\u0326\u0329\u032a\u032b\u032c\u032d\u032e\u032f\u0330\u0331\u0332\u0333\u0339\u033a\u033b\u033c\u0345\u0347\u0348\u0349\u034d\u034e\u0353\u0354\u0355\u0356\u0359\u035a\u0323";
const std::u16string COMBINING_UP = u"\u030d\u030e\u0304\u0305\u033f\u0311\u0306\u0310\u0352\u0357\u0351\u0307\u0308\u030a\u0342\u0343\u0344\u034a\u034b\u034c\u0303\u0302\u030c\u0350\u0300\u0301\u030b\u030f\u0312\u0313\u0314\u033d\u0309\u0363\u0364\u0365\u0366\u0367\u0368\u0369\u036a\u036b\u036c\u036d\u036e\u035b\u0346\u031a";
const std::u16string COMBINING_MIDDLE = u"\u0315\u031b\u0340\u0341\u0358\u0321\u0322\u0327\u0328\u0334\u0335\u0336\u034f\u035c\u035d\u035e\u035f\u0360\u0362\u0338\u0337\u0361\u0489";
// Add random Zalgo text to the paragraph.
void AddZalgoText(ParagraphBuilder* builder, Fuzz* fuzz) {
char text[MAX_TEXT_LENGTH];
const auto text_length = RandomText(text, fuzz);
std::u16string result;
for (auto& c : std::string(text, text_length)) {
result += c;
uint8_t mark_count;
fuzz->next(&mark_count);
for (int i = 0; i < mark_count; i++) {
uint8_t mark_type, mark_index;
fuzz->next(&mark_type, &mark_index);
switch (mark_type % 3) {
case 0:
result += COMBINING_UP[mark_index % COMBINING_UP.size()];
break;
case 1:
result += COMBINING_MIDDLE[mark_index % COMBINING_MIDDLE.size()];
break;
case 2:
default:
result += COMBINING_DOWN[mark_index % COMBINING_DOWN.size()];
break;
}
}
}
builder->addText(result);
}
void AddStyle(ParagraphBuilder* builder, Fuzz* fuzz) {
// TODO(westont): Make this probabilistic, and fill in the remaining TextStyle fields.
TextStyle ts;
ts.setFontFamilies({SkString("Roboto")});
//ts.setColor(SK_ColorBLACK);
//ts.setForegroundColor
//ts.setBackgroundColor
//ts.setDecoration(TextDecoration decoration);
//ts.setDecorationMode(TextDecorationMode mode);
//ts.setDecorationStyle(TextDecorationStyle style);
//ts.setDecorationColor(SkColor color);
//ts.setDecorationThicknessMultiplier(SkScalar m);
//ts.setFontStyle
//ts.addShadow
//ts.addFontFeature
//ts.setFontSize
//ts.setHeight
//ts.setHeightOverride
//ts.setletterSpacing
//ts.setWordSpacing
//ts.setTypeface
//ts.setLocale
//ts.setTextBaseline
//ts.setPlaceholder
builder->pushStyle(ts);
}
void RemoveStyle(ParagraphBuilder* builder, Fuzz* fuzz) {
bool pop;
fuzz->next(&pop);
if (pop) {
builder->pop();
}
}
void AddStyleAndText(ParagraphBuilder* builder, Fuzz* fuzz) {
AddStyle(builder, fuzz);
uint8_t text_type;
fuzz->next(&text_type);
switch (text_type % 3) {
case 0:
AddASCIIText(builder, fuzz);
break;
case 1:
AddUnicodeText(builder, fuzz);
break;
case 2:
AddZalgoText(builder, fuzz);
break;
}
RemoveStyle(builder, fuzz);
}
ParagraphStyle BuildParagraphStyle(Fuzz* fuzz) {
ParagraphStyle ps;
bool hinting;
fuzz->next(&hinting);
if (hinting) {
ps.turnHintingOff();
}
StrutStyle ss;
// TODO(westont): Fuzz this object.
ps.setStrutStyle(ss);
TextDirection td;
fuzz->nextEnum(&td, TextDirection::kRtl);
ps.setTextDirection(td);
TextAlign ta;
fuzz->nextEnum(&ta, TextAlign::kEnd);
ps.setTextAlign(ta);
size_t ml;
fuzz->next(&ml);
ps.setMaxLines(ml);
// TODO(westont): Randomize with other values and no value.
ps.setEllipsis(u"\u2026");
SkScalar h;
fuzz->next(&h);
ps.setHeight(h);
TextHeightBehavior thb = TextHeightBehavior::kAll;
// TODO(westont): This crashes our seed test case, why?
//fuzz->nextEnum(&thb, TextHeightBehavior::kDisableAll);
ps.setTextHeightBehavior(thb);
return ps;
}
} // namespace
DEF_FUZZ(SkParagraph, fuzz) {
static sk_sp<ResourceFontCollection> fontCollection = sk_make_sp<ResourceFontCollection>();
ParagraphStyle paragraph_style = BuildParagraphStyle(fuzz);
ParagraphBuilderImpl builder(paragraph_style, fontCollection);
uint8_t iterations;
fuzz->nextRange(&iterations, 1, MAX_TEXT_ADDITIONS);
for (int i = 0; i < iterations; i++) {
AddStyleAndText(&builder, fuzz);
}
// TODO(westont): Figure out if we can get more converage by having fontsFound, current
// they're not.
// if (!fontCollection->fontsFound()) return;
builder.pop();
auto paragraph = builder.Build();
SkBitmap bm;
if (!bm.tryAllocN32Pixels(TEST_CANVAS_DIM, TEST_CANVAS_DIM)) {
return;
}
SkCanvas canvas(bm);
uint8_t layout_width;
fuzz->next(&layout_width);
paragraph->layout(layout_width);
paragraph->paint(&canvas, 0, 0);
}