81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ImageHashManager"
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#include "ImageHashManager.h"
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#include <log/log_main.h>
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#include "pHash/phash_config.h"
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#include "pHash/phash_fingerprinter.h"
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#include <errno.h>
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namespace android {
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int32_t ImageHashManager::generatePHash(const uint8_t* buffer, int32_t width, int32_t height,
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int32_t stride, std::array<uint8_t, 8>* outImageHash) {
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if (width != kImageLength || height != kImageLength) {
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ALOGE("Failed to generate phash algorithm. Incorrect buffer size=%dx%d where %d is "
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"expected for width and height",
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width, height, kImageLength);
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return -EINVAL;
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}
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// Phash algorithm expects 1 byte per pixel instead of 4. Because the image is in grayscale,
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// RGB should all be the same and alpha should be 0xFF. The code below is compressing the full
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// buffer into a buffer that has 1 byte per pixel.
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std::array<uint8_t, kImageSize> compressedBuffer;
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size_t index = 0;
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for (int32_t j = 0; j < height; j++) {
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const uint8_t* src = buffer + (stride * j) * 4;
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for (int32_t i = 0; i < width; i++) {
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uint8_t r = *src;
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uint8_t g = *(src + 1);
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uint8_t b = *(src + 2);
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if (r != g || r != b) {
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ALOGE("Failed to generate phash algorithm. Buffer is not in grayscale. r=%02X "
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"g=%02X b=%02X",
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r, g, b);
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return -EINVAL;
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}
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compressedBuffer[index] = *src;
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src += 4;
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index++;
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}
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}
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PhashFingerprinter worker;
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const int64_t result = worker.GenerateFingerprint(compressedBuffer.data());
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*reinterpret_cast<int64_t*>(outImageHash->data()) = result;
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return 0;
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}
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int32_t ImageHashManager::generateHash(std::string hashAlgorithm, const uint8_t* buf,
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AHardwareBuffer_Desc bufferDesc,
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std::array<uint8_t, 8>* outImageHash) {
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if (hashAlgorithm == "phash") {
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int32_t stride = bufferDesc.stride > 0 ? bufferDesc.stride : bufferDesc.width;
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return generatePHash(buf, bufferDesc.width, bufferDesc.height, stride, outImageHash);
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}
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ALOGE("Failed to generate hash. Invalid hash algorithm sent %s", hashAlgorithm.c_str());
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return -EINVAL;
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}
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} // namespace android
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