| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "tests/Test.h" |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkStream.h" |
| #include "include/docs/SkPDFDocument.h" |
| |
| using PDFTag = SkPDF::StructureElementNode; |
| |
| // Test building a tagged PDF. |
| // Add this to args.gn to output the PDF to a file: |
| // extra_cflags = [ "-DSK_PDF_TEST_TAGS_OUTPUT_PATH=\"/tmp/foo.pdf\"" ] |
| DEF_TEST(SkPDF_tagged_doc, r) { |
| REQUIRE_PDF_DOCUMENT(SkPDF_tagged_doc, r); |
| #ifdef SK_PDF_TEST_TAGS_OUTPUT_PATH |
| SkFILEWStream outputStream(SK_PDF_TEST_TAGS_OUTPUT_PATH); |
| #else |
| SkDynamicMemoryWStream outputStream; |
| #endif |
| |
| SkSize pageSize = SkSize::Make(612, 792); // U.S. Letter |
| |
| SkPDF::Metadata metadata; |
| metadata.fTitle = "Example Tagged PDF"; |
| metadata.fCreator = "Skia"; |
| SkTime::DateTime now; |
| SkTime::GetDateTime(&now); |
| metadata.fCreation = now; |
| metadata.fModified = now; |
| |
| // The document tag. |
| auto root = std::make_unique<PDFTag>(); |
| root->fNodeId = 1; |
| root->fTypeString = "Document"; |
| |
| // Heading. |
| auto h1 = std::make_unique<PDFTag>(); |
| h1->fNodeId = 2; |
| h1->fTypeString = "H1"; |
| root->fChildVector.push_back(std::move(h1)); |
| |
| // Initial paragraph. |
| auto p = std::make_unique<PDFTag>(); |
| p->fNodeId = 3; |
| p->fTypeString = "P"; |
| root->fChildVector.push_back(std::move(p)); |
| |
| // Hidden div. This is never referenced by marked content |
| // so it should not appear in the resulting PDF. |
| auto div = std::make_unique<PDFTag>(); |
| div->fNodeId = 4; |
| div->fTypeString = "Div"; |
| root->fChildVector.push_back(std::move(div)); |
| |
| // A bulleted list of two items. |
| auto l = std::make_unique<PDFTag>(); |
| l->fNodeId = 5; |
| l->fTypeString = "L"; |
| |
| auto lm1 = std::make_unique<PDFTag>(); |
| lm1->fNodeId = 6; |
| lm1->fTypeString = "Lbl"; |
| l->fChildVector.push_back(std::move(lm1)); |
| |
| auto li1 = std::make_unique<PDFTag>(); |
| li1->fNodeId = 7; |
| li1->fTypeString = "LI"; |
| l->fChildVector.push_back(std::move(li1)); |
| |
| auto lm2 = std::make_unique<PDFTag>(); |
| lm2->fNodeId = 8; |
| lm2->fTypeString = "Lbl"; |
| l->fChildVector.push_back(std::move(lm2)); |
| auto li2 = std::make_unique<PDFTag>(); |
| li2->fNodeId = 9; |
| li2->fTypeString = "LI"; |
| l->fChildVector.push_back(std::move(li2)); |
| |
| root->fChildVector.push_back(std::move(l)); |
| |
| // Paragraph spanning two pages. |
| auto p2 = std::make_unique<PDFTag>(); |
| p2->fNodeId = 10; |
| p2->fTypeString = "P"; |
| root->fChildVector.push_back(std::move(p2)); |
| |
| // Image with alt text. |
| auto img = std::make_unique<PDFTag>(); |
| img->fNodeId = 11; |
| img->fTypeString = "Figure"; |
| img->fAlt = "Red box"; |
| root->fChildVector.push_back(std::move(img)); |
| |
| metadata.fStructureElementTreeRoot = root.get(); |
| sk_sp<SkDocument> document = SkPDF::MakeDocument( |
| &outputStream, metadata); |
| |
| SkPaint paint; |
| paint.setColor(SK_ColorBLACK); |
| |
| // First page. |
| SkCanvas* canvas = |
| document->beginPage(pageSize.width(), |
| pageSize.height()); |
| SkPDF::SetNodeId(canvas, 2); |
| SkFont font(nullptr, 36); |
| const char* message = "This is the title"; |
| canvas->translate(72, 72); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 3); |
| font.setSize(14); |
| message = "This is a simple paragraph."; |
| canvas->translate(0, 72); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 6); |
| font.setSize(14); |
| message = "*"; |
| canvas->translate(0, 72); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 7); |
| message = "List item 1"; |
| canvas->translate(36, 0); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 8); |
| message = "*"; |
| canvas->translate(-36, 36); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 9); |
| message = "List item 2"; |
| canvas->translate(36, 0); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| SkPDF::SetNodeId(canvas, 10); |
| message = "This is a paragraph that starts on one page"; |
| canvas->translate(-36, 6 * 72); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| document->endPage(); |
| |
| // Second page. |
| canvas = document->beginPage(pageSize.width(), |
| pageSize.height()); |
| SkPDF::SetNodeId(canvas, 10); |
| message = "and finishes on the second page."; |
| canvas->translate(72, 72); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| // Test a tagged image with alt text. |
| SkPDF::SetNodeId(canvas, 11); |
| SkBitmap testBitmap; |
| testBitmap.allocN32Pixels(72, 72); |
| testBitmap.eraseColor(SK_ColorRED); |
| canvas->translate(72, 72); |
| canvas->drawImage(testBitmap.asImage(), 0, 0); |
| |
| // This has a node ID but never shows up in the tag tree so it |
| // won't be tagged. |
| SkPDF::SetNodeId(canvas, 999); |
| message = "Page 2"; |
| canvas->translate(468, -36); |
| canvas->drawString(message, 0, 0, font, paint); |
| |
| document->endPage(); |
| |
| document->close(); |
| |
| outputStream.flush(); |
| } |