| // Copyright 2021 The Cobalt Authors. All Rights Reserved. |
| // |
| // 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. |
| |
| #ifndef COBALT_LOADER_IMAGE_FAILURE_IMAGE_DECODER_H_ |
| #define COBALT_LOADER_IMAGE_FAILURE_IMAGE_DECODER_H_ |
| |
| #include <memory> |
| #include <string> |
| |
| #include "base/compiler_specific.h" |
| #include "cobalt/loader/image/image.h" |
| #include "cobalt/loader/image/image_data_decoder.h" |
| |
| namespace cobalt { |
| namespace loader { |
| namespace image { |
| |
| // This class always signals a decoding error rather than decoding. It can |
| // be used for imitating the normal image decoders without doing any |
| // decoding works. |
| class FailureImageDecoder : public ImageDataDecoder { |
| public: |
| explicit FailureImageDecoder(render_tree::ResourceProvider* resource_provider, |
| const base::DebuggerHooks& debugger_hooks) |
| : ImageDataDecoder(resource_provider, debugger_hooks) {} |
| |
| // From ImageDataDecoder |
| std::string GetTypeString() const override { return "FailureImageDecoder"; } |
| |
| private: |
| // From ImageDataDecoder |
| size_t DecodeChunkInternal(const uint8* data, size_t input_byte) override { |
| set_state(kError); |
| return input_byte; |
| } |
| scoped_refptr<Image> FinishInternal() override { |
| // Indicate the failure of decoding works. |
| return nullptr; |
| } |
| }; |
| |
| } // namespace image |
| } // namespace loader |
| } // namespace cobalt |
| |
| #endif // COBALT_LOADER_IMAGE_FAILURE_IMAGE_DECODER_H_ |