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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include "base/check.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkImageInfo.h"
#include "third_party/skia/include/core/SkPixmap.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkSurface.h"
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
template <typename T>
static bool read(const uint8_t** data, size_t* size, T* value) {
if (*size < sizeof(T)) {
return false;
}
*value = *reinterpret_cast<const T*>(*data);
*data += sizeof(T);
*size -= sizeof(T);
return true;
}
#define READ_INT(output) \
if (!read<int>(&data, &size, &output)) \
return 0;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
int iMethod, srcW, srcH, dstW, dstH, subsetX, subsetY, subsetR, subsetB;
READ_INT(iMethod)
READ_INT(srcW)
READ_INT(srcH)
READ_INT(dstW)
READ_INT(dstH)
READ_INT(subsetX)
READ_INT(subsetY)
READ_INT(subsetR)
READ_INT(subsetB)
skia::ImageOperations::ResizeMethod method =
skia::ImageOperations::RESIZE_GOOD;
switch (iMethod) {
case 1:
method = skia::ImageOperations::RESIZE_BETTER;
break;
case 2:
method = skia::ImageOperations::RESIZE_BEST;
break;
case 3:
method = skia::ImageOperations::RESIZE_BOX;
break;
case 4:
method = skia::ImageOperations::RESIZE_HAMMING1;
break;
case 5:
method = skia::ImageOperations::RESIZE_LANCZOS3;
break;
default:
break; // RESIZE_GOOD
}
if (srcW < 0 || srcH < 0 || srcW > 300 || srcH > 300) {
return 0;
}
if (dstW <= 0 || dstH <= 0 || dstW > srcW || dstH > srcH) {
return 0;
}
if (dstW == 0 && dstH == 0) {
return 0;
}
SkIRect subset = SkIRect{subsetX, subsetY, subsetR, subsetB};
if (subset.isEmpty()) {
return 0;
}
SkIRect dest = {0, 0, dstW, dstH};
if (!dest.contains(subset)) {
return 0;
}
sk_sp<SkSurface> surface =
SkSurfaces::Raster(SkImageInfo::MakeN32(srcW, srcH, kOpaque_SkAlphaType));
if (!surface) {
return 0;
}
SkPixmap input;
if (!surface->peekPixels(&input)) {
return 0;
}
SkBitmap bitmap =
skia::ImageOperations::Resize(input, method, dstW, dstH, subset);
return 0;
}
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