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// (C) Copyright 2017, 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 <string>
#include <vector>
#include "imagedata.h"
#include "include_gunit.h"
#include "log.h"
namespace tesseract {
// Tests the caching mechanism of DocumentData/ImageData.
class ImagedataTest : public ::testing::Test {
protected:
void SetUp() override {
std::locale::global(std::locale(""));
file::MakeTmpdir();
}
ImagedataTest() = default;
// Creates a fake DocumentData, writes it to a file, and returns the filename.
std::string MakeFakeDoc(int num_pages, unsigned doc_id, std::vector<std::string> *page_texts) {
// The size of the fake images that we will use.
const int kImageSize = 1048576;
// Not using a real image here - just an array of zeros! We are just testing
// that the truth text matches.
std::vector<char> fake_image(kImageSize, 0);
DocumentData write_doc("My document");
for (int p = 0; p < num_pages; ++p) {
// Make some fake text that is different for each page and save it.
char text[80];
snprintf(text, sizeof(text), "Page %d of %d in doc %u", p, num_pages, doc_id);
page_texts->push_back(text);
// Make an imagedata and put it in the document.
ImageData *imagedata = ImageData::Build("noname", p, "eng", fake_image.data(),
fake_image.size(), (*page_texts)[p].c_str(), nullptr);
EXPECT_EQ(kImageSize, imagedata->MemoryUsed());
write_doc.AddPageToDocument(imagedata);
}
// Write it to a file.
std::string filename =
file::JoinPath(FLAGS_test_tmpdir, "documentdata");
filename += std::to_string(doc_id) + ".lstmf";
EXPECT_TRUE(write_doc.SaveDocument(filename.c_str(), nullptr));
return filename;
}
};
TEST_F(ImagedataTest, CachesProperly) {
// This test verifies that Imagedata can be stored in a DocumentData and a
// collection of them is cached correctly given limited memory.
// Number of pages to put in the fake document.
const int kNumPages = 12;
// Allowances to read the document. Big enough for 1, 3, 0, all pages.
const int kMemoryAllowances[] = {2000000, 4000000, 1000000, 100000000, 0};
// Order in which to read the pages, with some sequential and some seeks.
const int kPageReadOrder[] = {0, 1, 2, 3, 8, 4, 5, 6, 7, 11, 10, 9, -1};
std::vector<std::string> page_texts;
std::string filename = MakeFakeDoc(kNumPages, 0, &page_texts);
// Now try getting it back with different memory allowances and check that
// the pages can still be read.
for (int m = 0; kMemoryAllowances[m] > 0; ++m) {
DocumentData read_doc("My document");
EXPECT_TRUE(read_doc.LoadDocument(filename.c_str(), 0, kMemoryAllowances[m], nullptr));
LOG(ERROR) << "Allowance = " << kMemoryAllowances[m];
// Read the pages in a specific order.
for (int p = 0; kPageReadOrder[p] >= 0; ++p) {
int page = kPageReadOrder[p];
const ImageData *imagedata = read_doc.GetPage(page);
EXPECT_NE(nullptr, imagedata);
// EXPECT_NE(reinterpret_cast<ImageData*>(nullptr), imagedata);
// Check that this is the right page.
EXPECT_STREQ(page_texts[page].c_str(), imagedata->transcription().c_str());
}
}
}
TEST_F(ImagedataTest, CachesMultiDocs) {
// This test verifies that DocumentCache works to store multiple DocumentData
// and the two caching strategies read images in the right order.
// Number of pages in each document.
const std::vector<int> kNumPages = {6, 5, 7};
std::vector<std::vector<std::string>> page_texts;
std::vector<std::string> filenames;
for (size_t d = 0; d < kNumPages.size(); ++d) {
page_texts.emplace_back(std::vector<std::string>());
std::string filename = MakeFakeDoc(kNumPages[d], d, &page_texts.back());
filenames.push_back(filename);
}
// Now try getting them back with different cache strategies and check that
// the pages come out in the right order.
DocumentCache robin_cache(8000000);
robin_cache.LoadDocuments(filenames, tesseract::CS_ROUND_ROBIN, nullptr);
DocumentCache serial_cache(8000000);
serial_cache.LoadDocuments(filenames, tesseract::CS_SEQUENTIAL, nullptr);
for (int p = 0; p <= 21; ++p) {
LOG(INFO) << "Page " << p;
const ImageData *robin_data = robin_cache.GetPageBySerial(p);
const ImageData *serial_data = serial_cache.GetPageBySerial(p);
CHECK(robin_data != nullptr);
CHECK(serial_data != nullptr);
int robin_doc = p % kNumPages.size();
int robin_page = p / kNumPages.size() % kNumPages[robin_doc];
// Check that this is the right page.
EXPECT_STREQ(page_texts[robin_doc][robin_page].c_str(), robin_data->transcription().c_str());
int serial_doc = p / kNumPages[0] % kNumPages.size();
int serial_page = p % kNumPages[0] % kNumPages[serial_doc];
EXPECT_STREQ(page_texts[serial_doc][serial_page].c_str(), serial_data->transcription().c_str());
}
}
} // namespace tesseract
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