// Copyright 2018 Google Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

////////////////////////////////////////////////////////////////////////////////

#include <cstddef>

#include <cstdint>

#include <cstdio>

#include <cstdlib>

#include "./fuzz_utils.h"

#include "src/dsp/cpu.h"

#include "src/webp/decode.h"

#include "src/webp/encode.h"

namespace {

const VP8CPUInfo default_VP8GetCPUInfo = fuzz_utils::VP8GetCPUInfo;

void EncDecTest(bool use_argb, int source_image_index, WebPConfig config,

                int optimization_index,

                const fuzz_utils::CropOrScaleParams& crop_or_scale_params) {

  fuzz_utils::SetOptimization(default_VP8GetCPUInfo, optimization_index);

  // Init the source picture.

  WebPPicture pic = fuzz_utils::GetSourcePicture(source_image_index, use_argb);

  // Crop and scale.

  if (!fuzz_utils::CropOrScale(&pic, crop_or_scale_params)) {

    const WebPEncodingError error_code = pic.error_code;

    WebPPictureFree(&pic);

    if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return;

    fprintf(stderr, "ExtractAndCropOrScale failed. Error code: %d\n",

            error_code);

    std::abort();

  }

  // Skip slow settings on big images, it's likely to timeout.

  if (pic.width * pic.height > 32 * 32) {

    if (config.lossless) {

      if (config.quality > 99.0f && config.method >= 5) {

        config.quality = 99.0f;

        config.method = 5;

      }

    } else {

      if (config.quality > 99.0f && config.method == 6) {

        config.quality = 99.0f;

      }

    }

    if (config.alpha_quality == 100 && config.method == 6) {

      config.alpha_quality = 99;

    }

  }

  // Encode.

  WebPMemoryWriter memory_writer;

  WebPMemoryWriterInit(&memory_writer);

  pic.writer = WebPMemoryWrite;

  pic.custom_ptr = &memory_writer;

  if (!WebPEncode(&config, &pic)) {

    const WebPEncodingError error_code = pic.error_code;

    WebPMemoryWriterClear(&memory_writer);

    WebPPictureFree(&pic);

    if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY ||

        error_code == VP8_ENC_ERROR_BAD_WRITE) {

      return;

    }

    fprintf(stderr, "WebPEncode failed. Error code: %d\n", error_code);

    std::abort();

  }

  // Try decoding the result.

  const uint8_t* const out_data = memory_writer.mem;

  const size_t out_size = memory_writer.size;

  WebPDecoderConfig dec_config;

  if (!WebPInitDecoderConfig(&dec_config)) {

    fprintf(stderr, "WebPInitDecoderConfig failed.\n");

    WebPMemoryWriterClear(&memory_writer);

    WebPPictureFree(&pic);

    std::abort();

  }

  dec_config.output.colorspace = MODE_BGRA;

  const VP8StatusCode status = WebPDecode(out_data, out_size, &dec_config);

  if ((status != VP8_STATUS_OK && status != VP8_STATUS_OUT_OF_MEMORY &&

       status != VP8_STATUS_USER_ABORT) ||

      (status == VP8_STATUS_OK && (dec_config.output.width != pic.width ||

                                   dec_config.output.height != pic.height))) {

    fprintf(stderr, "WebPDecode failed. status: %d.\n", status);

    WebPFreeDecBuffer(&dec_config.output);

    WebPMemoryWriterClear(&memory_writer);

    WebPPictureFree(&pic);

    std::abort();

  }

  if (status == VP8_STATUS_OK) {

    const uint8_t* const rgba = dec_config.output.u.RGBA.rgba;

    const int w = dec_config.output.width;

    const int h = dec_config.output.height;

    // Compare the results if exact encoding.

    if (pic.use_argb && config.lossless && config.near_lossless == 100) {

      const uint32_t* src1 = (const uint32_t*)rgba;

      const uint32_t* src2 = pic.argb;

      for (int y = 0; y < h; ++y, src1 += w, src2 += pic.argb_stride) {

        for (int x = 0; x < w; ++x) {

          uint32_t v1 = src1[x], v2 = src2[x];

          if (!config.exact) {

            if ((v1 & 0xff000000u) == 0 || (v2 & 0xff000000u) == 0) {

              // Only keep alpha for comparison of fully transparent area.

              v1 &= 0xff000000u;

              v2 &= 0xff000000u;

            }

          }

          if (v1 != v2) {

            fprintf(stderr, "Lossless compression failed pixel-exactness.\n");

            WebPFreeDecBuffer(&dec_config.output);

            WebPMemoryWriterClear(&memory_writer);

            WebPPictureFree(&pic);

            std::abort();

          }

        }

      }

    }

  }

  WebPFreeDecBuffer(&dec_config.output);

  WebPMemoryWriterClear(&memory_writer);

  WebPPictureFree(&pic);

}

}  // namespace

FUZZ_TEST(EncDec, EncDecTest)

    .WithDomains(/*use_argb=*/fuzztest::Arbitrary<bool>(),

                 /*source_image_index=*/

                 fuzztest::InRange<int>(0, fuzz_utils::kNumSourceImages - 1),

                 fuzz_utils::ArbitraryWebPConfig(),

                 /*optimization_index=*/

                 fuzztest::InRange<uint32_t>(0,

                                             fuzz_utils::kMaxOptimizationIndex),

                 fuzz_utils::ArbitraryCropOrScaleParams());