62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
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/*
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* Copyright 2022 Google, LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/core/SkCanvas.h"
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#include "include/core/SkData.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkStream.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTypeface.h"
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#include "src/core/SkFontMgrPriv.h"
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#include <algorithm>
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void FuzzCOLRv1(sk_sp<SkData> bytes) {
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// We do not want the portable fontmgr here, as it does not allow creation of fonts from bytes.
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gSkFontMgr_DefaultFactory = nullptr;
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std::unique_ptr<SkStreamAsset> stream = SkMemoryStream::Make(bytes);
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sk_sp<SkTypeface> typeface = SkTypeface::MakeFromStream(std::move(stream));
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if (!typeface) {
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return;
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}
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auto s = SkSurface::MakeRasterN32Premul(128, 128);
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if (!s) {
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return;
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}
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// Place at a baseline in the lower part of the canvas square, but canvas size and baseline
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// placement are chosen arbitrarily and we just need to cover colrv1 rendering in this
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// fuzz test.
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SkFont colrv1Font = SkFont(typeface, 120);
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SkCanvas* canvas = s->getCanvas();
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SkPaint paint;
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int numGlyphs = typeface->countGlyphs();
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for (int i = 0; i < std::min(numGlyphs, 10); ++i) {
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SkPoint origin = SkPoint::Make(10, 108);
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SkPoint position = SkPoint::Make(0, 0);
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SkGlyphID glyphId = i;
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canvas->drawGlyphs(1, &glyphId, &position, origin, colrv1Font, paint);
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}
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}
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#if defined(SK_BUILD_FOR_LIBFUZZER)
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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// COLRv1 corpus file sizes range from 8k for a small test glyph file to about 80k covering
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// most of the complex Noto Emoji glyphs, compare:
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// See https://github.com/googlefonts/color-fonts/blob/main/rebuild_fuzzer_corpus.py
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if (size > 80 * 1024) {
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return 0;
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}
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auto bytes = SkData::MakeWithoutCopy(data, size);
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FuzzCOLRv1(bytes);
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return 0;
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}
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#endif
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