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PDF Renderer: allow to specify an alternate image or resolution progr…
…ammatically. Support new rendering_dpi api params. Add pdf renderer tests. Install pdf font in cmake tool chain. resolves tesseract-ocr#210 resolves tesseract-ocr#3798
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| // (C) Copyright 2023, Tesseract Contributors. | ||
| // 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. | ||
|
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| #include <allheaders.h> | ||
| #include <tesseract/renderer.h> | ||
| #include <filesystem> | ||
| #include <string> | ||
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| #include "include_gunit.h" | ||
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| namespace tesseract { | ||
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| static std::map<std::string, std::string> userdefined_dpi_variables = { | ||
| {"user_defined_dpi", "300"}}; | ||
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| class TessPDFRendererTest : public testing::Test { | ||
| protected: | ||
| static std::string TestDataNameToPath(const std::string &name) { | ||
| return file::JoinPath(TESTING_DIR, name); | ||
| } | ||
| static std::string TessdataPath() { | ||
| return TESSDATA_DIR; | ||
| } | ||
| static std::string TestPDFName(const std::string &suffix) { | ||
| return "/tmp/tesseract_pdf_renderer_test_phottest" + suffix; | ||
| } | ||
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| static void AssertPDFSizeLT(const std::string &filename, int size) { | ||
| std::filesystem::path p = filename + ".pdf"; | ||
| ASSERT_LT(std::filesystem::file_size(p), size); | ||
| } | ||
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| static void AssertPDFRemove(const std::string &filename) { | ||
| ASSERT_EQ(std::remove((filename + ".pdf").c_str()), 0); | ||
| } | ||
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| static bool initializeAPI( | ||
| TessBaseAPI &api, const std::map<std::string, std::string> &variables) { | ||
| EXPECT_EQ(api.Init(TESSDATA_DIR, "eng", OEM_LSTM_ONLY), 0); | ||
| for (const auto &[name, value] : variables) { | ||
| api.SetVariable(name.c_str(), value.c_str()); | ||
| } | ||
| return true; | ||
| } | ||
|
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| static bool ProcessAndRenderPages( | ||
| const std::string &input_filename, TessPDFRenderer *pdf_renderer, | ||
| const std::map<std::string, std::string> &variables) { | ||
| TessBaseAPI api; | ||
| initializeAPI(api, variables); | ||
| auto testdata_input_filename = TestDataNameToPath(input_filename); | ||
| EXPECT_TRUE(api.ProcessPages(testdata_input_filename.c_str(), TESSDATA_DIR, | ||
| 1000, pdf_renderer)); | ||
| api.End(); | ||
| return pdf_renderer->happy(); | ||
| } | ||
|
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| static void RenderPDFAndAssertSize( | ||
| const std::string &image_file, const std::string &pdf_suffix, | ||
| bool text_only, int max_file_size, | ||
| const std::map<std::string, std::string> &variables = {}) { | ||
| auto pdf_name = TestPDFName(pdf_suffix); | ||
| auto pdf_renderer = std::make_unique<TessPDFRenderer>( | ||
| pdf_name.c_str(), "tessdata", text_only); | ||
| ASSERT_TRUE( | ||
| ProcessAndRenderPages(image_file, pdf_renderer.get(), variables)); | ||
| AssertPDFSizeLT(pdf_name, max_file_size); | ||
| AssertPDFRemove(pdf_name); | ||
| } | ||
| }; | ||
|
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| // Test basic pdf rendering | ||
| TEST_F(TessPDFRendererTest, TestPDFRenderBasicTest) { | ||
| RenderPDFAndAssertSize("phototest_2.tif", "", false, 113000); | ||
| } | ||
|
|
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| // Test pdf rendering with lower jpeg quality | ||
| TEST_F(TessPDFRendererTest, TestPDFRenderJPEGQualityTest) { | ||
| static std::map<std::string, std::string> variables = {{"jpg_quality", "40"}}; | ||
| RenderPDFAndAssertSize("phototest_2.tif", "jpg_quality", false, 66000, | ||
| variables); | ||
| } | ||
|
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| // Test pdf renderer text only | ||
| TEST_F(TessPDFRendererTest, TestPDFRenderTextOnlyTest) { | ||
| RenderPDFAndAssertSize("phototest_2.tif", "text_only", true, 3500); | ||
| } | ||
|
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| // Test that pdf renderer generates a custom image resolution in the pdf export | ||
| TEST_F(TessPDFRendererTest, TestPDFRenderLowerResolutionTest) { | ||
| std::string pdf_name = TestPDFName("lower_resolution"); | ||
| auto pdf_renderer = | ||
| std::make_unique<TessPDFRenderer>(pdf_name.c_str(), "tessdata", false); | ||
| pdf_renderer->SetRenderingResolution(110); | ||
| CHECK_OK(ProcessAndRenderPages("phototest_2.tif", pdf_renderer.get(), | ||
| userdefined_dpi_variables)); | ||
| AssertPDFSizeLT(pdf_name, 35000); | ||
| AssertPDFRemove(pdf_name); | ||
| } | ||
|
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| // Test that pdf renderer generates a custom image resolution in the pdf export | ||
| // with variable directive | ||
| TEST_F(TessPDFRendererTest, TestPDFLowerResolutionVariableTest) { | ||
| std::string pdf_name = TestPDFName("lower_resolution_variable"); | ||
| static std::map<std::string, std::string> variables = { | ||
| {"rendering_dpi", "110"}}; | ||
| variables.insert(begin(userdefined_dpi_variables), | ||
| end(userdefined_dpi_variables)); | ||
| auto pdf_renderer = | ||
| std::make_unique<TessPDFRenderer>(pdf_name.c_str(), "tessdata", false); | ||
| CHECK_OK( | ||
| ProcessAndRenderPages("phototest_2.tif", pdf_renderer.get(), variables)); | ||
| AssertPDFSizeLT(pdf_name, 35000); | ||
| AssertPDFRemove(pdf_name); | ||
| } | ||
|
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| // Test that pdf renderer generates an alternate image in the pdf export | ||
| TEST_F(TessPDFRendererTest, TestPDFAlternateImageTest) { | ||
| std::string pdf_name = TestPDFName("alternate_image"); | ||
| auto pdf_renderer = | ||
| std::make_unique<TessPDFRenderer>(pdf_name.c_str(), "tessdata", false); | ||
| auto alternate_image = pixRead(TestDataNameToPath("phototest.tif").c_str()); | ||
| pdf_renderer->SetRenderingImage(alternate_image); | ||
| CHECK_OK(ProcessAndRenderPages("phototest_2.tif", pdf_renderer.get(), | ||
| std::map<std::string, std::string>())); | ||
| pixDestroy(&alternate_image); | ||
| AssertPDFSizeLT(pdf_name, 8000); | ||
| AssertPDFRemove(pdf_name); | ||
| } | ||
|
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| } // namespace tesseract |