Move WebpDecoder from ios/web to components/image_fetcher

ios/web/public/image_fetcher/webp_decoder_unittest.mm

Index: ios/web/public/image_fetcher/webp_decoder_unittest.mm
diff --git a/ios/web/public/image_fetcher/webp_decoder_unittest.mm b/ios/web/public/image_fetcher/webp_decoder_unittest.mm
deleted file mode 100644
index 64d767c3f81f99b8b54241b367337d31706b44f1..0000000000000000000000000000000000000000
--- a/ios/web/public/image_fetcher/webp_decoder_unittest.mm
+++ /dev/null
@@ -1,276 +0,0 @@
-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import "ios/web/public/image_fetcher/webp_decoder.h"
-
-#import <CoreGraphics/CoreGraphics.h>
-#import <Foundation/Foundation.h>
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/base_paths.h"
-#include "base/files/file_path.h"
-#include "base/ios/ios_util.h"
-#include "base/logging.h"
-#include "base/mac/scoped_cftyperef.h"
-#import "base/mac/scoped_nsobject.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/path_service.h"
-#include "base/strings/sys_string_conversions.h"
-#include "build/build_config.h"
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace webp_transcode {
-namespace {
-
-class WebpDecoderDelegate : public WebpDecoder::Delegate {
- public:
-  WebpDecoderDelegate() : image_([[NSMutableData alloc] init]) {}
-
-  NSData* GetImage() const { return image_; }
-
-  // WebpDecoder::Delegate methods.
-  MOCK_METHOD1(OnFinishedDecoding, void(bool success));
-  MOCK_METHOD2(SetImageFeatures,
-               void(size_t total_size, WebpDecoder::DecodedImageFormat format));
-  void OnDataDecoded(NSData* data) override { [image_ appendData:data]; }
-
- private:
-  virtual ~WebpDecoderDelegate() {}
-
-  base::scoped_nsobject<NSMutableData> image_;
-};
-
-class WebpDecoderTest : public testing::Test {
- public:
-  WebpDecoderTest()
-      : delegate_(new WebpDecoderDelegate),
-        decoder_(new WebpDecoder(delegate_.get())) {}
-
-  NSData* LoadImage(const base::FilePath& filename) {
-    base::FilePath path;
-    PathService::Get(base::DIR_SOURCE_ROOT, &path);
-    path =
-        path.AppendASCII("ios/web/test/data/webp_transcode").Append(filename);
-    return
-        [NSData dataWithContentsOfFile:base::SysUTF8ToNSString(path.value())];
-  }
-
-  std::vector<uint8_t>* DecompressData(NSData* data,
-                                       WebpDecoder::DecodedImageFormat format) {
-    base::ScopedCFTypeRef<CGDataProviderRef> provider(
-        CGDataProviderCreateWithCFData((CFDataRef)data));
-    base::ScopedCFTypeRef<CGImageRef> image;
-    switch (format) {
-      case WebpDecoder::JPEG:
-        image.reset(CGImageCreateWithJPEGDataProvider(
-            provider, nullptr, false, kCGRenderingIntentDefault));
-        break;
-      case WebpDecoder::PNG:
-        image.reset(CGImageCreateWithPNGDataProvider(
-            provider, nullptr, false, kCGRenderingIntentDefault));
-        break;
-      case WebpDecoder::TIFF:
-        ADD_FAILURE() << "Data already decompressed";
-        return nil;
-      case WebpDecoder::DECODED_FORMAT_COUNT:
-        ADD_FAILURE() << "Unknown format";
-        return nil;
-    }
-    size_t width = CGImageGetWidth(image);
-    size_t height = CGImageGetHeight(image);
-    base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
-        CGColorSpaceCreateDeviceRGB());
-    size_t bytes_per_pixel = 4;
-    size_t bytes_per_row = bytes_per_pixel * width;
-    size_t bits_per_component = 8;
-    std::vector<uint8_t>* result =
-        new std::vector<uint8_t>(width * height * bytes_per_pixel, 0);
-    base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
-        &result->front(), width, height, bits_per_component, bytes_per_row,
-        color_space, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big));
-    CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
-    // Check that someting has been written in |result|.
-    std::vector<uint8_t> zeroes(width * height * bytes_per_pixel, 0);
-    EXPECT_NE(0, memcmp(&result->front(), &zeroes.front(), zeroes.size()))
-        << "Decompression failed.";
-    return result;
-  }
-
-  // Compares data, allowing an averaged absolute difference of 1.
-  bool CompareUncompressedData(const uint8_t* ptr_1,
-                               const uint8_t* ptr_2,
-                               size_t size) {
-    uint64_t difference = 0;
-    for (size_t i = 0; i < size; ++i) {
-      // Casting to int to avoid overflow.
-      int error = abs(int(ptr_1[i]) - int(ptr_2[i]));
-      EXPECT_GE(difference + error, difference)
-          << "Image difference too big (overflow).";
-      difference += error;
-    }
-    double average_difference = double(difference) / double(size);
-    DLOG(INFO) << "Average image difference: " << average_difference;
-    return average_difference < 1.5;
-  }
-
-  bool CheckCompressedImagesEqual(NSData* data_1,
-                                  NSData* data_2,
-                                  WebpDecoder::DecodedImageFormat format) {
-    std::unique_ptr<std::vector<uint8_t>> uncompressed_1(
-        DecompressData(data_1, format));
-    std::unique_ptr<std::vector<uint8_t>> uncompressed_2(
-        DecompressData(data_2, format));
-    if (uncompressed_1->size() != uncompressed_2->size()) {
-      DLOG(ERROR) << "Image sizes don't match";
-      return false;
-    }
-    return CompareUncompressedData(&uncompressed_1->front(),
-                                   &uncompressed_2->front(),
-                                   uncompressed_1->size());
-  }
-
-  bool CheckTiffImagesEqual(NSData* image_1, NSData* image_2) {
-    if ([image_1 length] != [image_2 length]) {
-      DLOG(ERROR) << "Image lengths don't match";
-      return false;
-    }
-    // Compare headers.
-    const size_t kHeaderSize = WebpDecoder::GetHeaderSize();
-    NSData* header_1 = [image_1 subdataWithRange:NSMakeRange(0, kHeaderSize)];
-    NSData* header_2 = [image_2 subdataWithRange:NSMakeRange(0, kHeaderSize)];
-    if (!header_1 || !header_2)
-      return false;
-    if (![header_1 isEqualToData:header_2]) {
-      DLOG(ERROR) << "Headers don't match.";
-      return false;
-    }
-    return CompareUncompressedData(
-        static_cast<const uint8_t*>([image_1 bytes]) + kHeaderSize,
-        static_cast<const uint8_t*>([image_2 bytes]) + kHeaderSize,
-        [image_1 length] - kHeaderSize);
-  }
-
- protected:
-  scoped_refptr<WebpDecoderDelegate> delegate_;
-  scoped_refptr<WebpDecoder> decoder_;
-};
-
-}  // namespace
-
-TEST_F(WebpDecoderTest, DecodeToJpeg) {
-  // Load a WebP image from disk.
-  base::scoped_nsobject<NSData> webp_image(
-      LoadImage(base::FilePath("test.webp")));
-  ASSERT_TRUE(webp_image != nil);
-  // Load reference image.
-  base::scoped_nsobject<NSData> jpg_image(
-      LoadImage(base::FilePath("test.jpg")));
-  ASSERT_TRUE(jpg_image != nil);
-  // Convert to JPEG.
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(true)).Times(1);
-  EXPECT_CALL(*delegate_, SetImageFeatures(testing::_, WebpDecoder::JPEG))
-      .Times(1);
-  decoder_->OnDataReceived(webp_image);
-  // Compare to reference image.
-  EXPECT_TRUE(CheckCompressedImagesEqual(jpg_image, delegate_->GetImage(),
-                                         WebpDecoder::JPEG));
-}
-
-TEST_F(WebpDecoderTest, DecodeToPng) {
-  // Load a WebP image from disk.
-  base::scoped_nsobject<NSData> webp_image(
-      LoadImage(base::FilePath("test_alpha.webp")));
-  ASSERT_TRUE(webp_image != nil);
-  // Load reference image.
-  base::scoped_nsobject<NSData> png_image(
-      LoadImage(base::FilePath("test_alpha.png")));
-  ASSERT_TRUE(png_image != nil);
-  // Convert to PNG.
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(true)).Times(1);
-  EXPECT_CALL(*delegate_, SetImageFeatures(testing::_, WebpDecoder::PNG))
-      .Times(1);
-  decoder_->OnDataReceived(webp_image);
-  // Compare to reference image.
-  EXPECT_TRUE(CheckCompressedImagesEqual(png_image, delegate_->GetImage(),
-                                         WebpDecoder::PNG));
-}
-
-TEST_F(WebpDecoderTest, DecodeToTiff) {
-  // Load a WebP image from disk.
-  base::scoped_nsobject<NSData> webp_image(
-      LoadImage(base::FilePath("test_small.webp")));
-  ASSERT_TRUE(webp_image != nil);
-  // Load reference image.
-  base::scoped_nsobject<NSData> tiff_image(
-      LoadImage(base::FilePath("test_small.tiff")));
-  ASSERT_TRUE(tiff_image != nil);
-  // Convert to TIFF.
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(true)).Times(1);
-  EXPECT_CALL(*delegate_,
-              SetImageFeatures([tiff_image length], WebpDecoder::TIFF))
-      .Times(1);
-  decoder_->OnDataReceived(webp_image);
-  // Compare to reference image.
-  EXPECT_TRUE(CheckTiffImagesEqual(tiff_image, delegate_->GetImage()));
-}
-
-TEST_F(WebpDecoderTest, StreamedDecode) {
-  // Load a WebP image from disk.
-  base::scoped_nsobject<NSData> webp_image(
-      LoadImage(base::FilePath("test.webp")));
-  ASSERT_TRUE(webp_image != nil);
-  // Load reference image.
-  base::scoped_nsobject<NSData> jpg_image(
-      LoadImage(base::FilePath("test.jpg")));
-  ASSERT_TRUE(jpg_image != nil);
-  // Convert to JPEG in chunks.
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(true)).Times(1);
-  EXPECT_CALL(*delegate_, SetImageFeatures(testing::_, WebpDecoder::JPEG))
-      .Times(1);
-  const size_t kChunkSize = 10;
-  unsigned int num_chunks = 0;
-  while ([webp_image length] > kChunkSize) {
-    base::scoped_nsobject<NSData> chunk(
-        [webp_image subdataWithRange:NSMakeRange(0, kChunkSize)]);
-    decoder_->OnDataReceived(chunk);
-    webp_image.reset([webp_image
-        subdataWithRange:NSMakeRange(kChunkSize,
-                                     [webp_image length] - kChunkSize)]);
-    ++num_chunks;
-  }
-  if ([webp_image length] > 0u) {
-    decoder_->OnDataReceived(webp_image);
-    ++num_chunks;
-  }
-  ASSERT_GT(num_chunks, 3u) << "Not enough chunks";
-  // Compare to reference image.
-  EXPECT_TRUE(CheckCompressedImagesEqual(jpg_image, delegate_->GetImage(),
-                                         WebpDecoder::JPEG));
-}
-
-TEST_F(WebpDecoderTest, InvalidFormat) {
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(false)).Times(1);
-  const char dummy_image[] = "(>'-')> <('-'<) ^('-')^ <('-'<) (>'-')>";
-  base::scoped_nsobject<NSData> data(
-      [[NSData alloc] initWithBytes:dummy_image length:arraysize(dummy_image)]);
-  decoder_->OnDataReceived(data);
-  EXPECT_EQ(0u, [delegate_->GetImage() length]);
-}
-
-TEST_F(WebpDecoderTest, DecodeAborted) {
-  EXPECT_CALL(*delegate_, OnFinishedDecoding(false)).Times(1);
-  decoder_->Stop();
-  EXPECT_EQ(0u, [delegate_->GetImage() length]);
-}
-
-}  // namespace webp_transcode