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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- // This sample progam demonstrates how to use Skia and HarfBuzz to
- // produce a PDF file from UTF-8 text in stdin.
- #include <cassert>
- #include <cstdlib>
- #include <iostream>
- #include <map>
- #include <sstream>
- #include <string>
- #include <vector>
- #include "include/core/SkCanvas.h"
- #include "include/core/SkStream.h"
- #include "include/core/SkTextBlob.h"
- #include "include/core/SkTypeface.h"
- #include "include/docs/SkPDFDocument.h"
- #include "modules/skshaper/include/SkShaper.h"
- // Options /////////////////////////////////////////////////////////////////////
- struct BaseOption {
- std::string selector;
- std::string description;
- virtual void set(std::string _value) = 0;
- virtual std::string valueToString() = 0;
- BaseOption(std::string _selector, std::string _description)
- : selector(_selector), description(_description) {}
- virtual ~BaseOption() {}
- static void Init(const std::vector<BaseOption*> &, int argc, char **argv);
- };
- template <class T>
- struct Option : BaseOption {
- T value;
- Option(std::string _selector, std::string _description, T defaultValue)
- : BaseOption(_selector, _description), value(defaultValue) {}
- };
- void BaseOption::Init(const std::vector<BaseOption*> &option_list,
- int argc, char **argv) {
- std::map<std::string, BaseOption *> options;
- for (BaseOption *opt : option_list) {
- options[opt->selector] = opt;
- }
- for (int i = 1; i < argc; i++) {
- std::string option_selector(argv[i]);
- auto it = options.find(option_selector);
- if (it != options.end()) {
- if (i >= argc) {
- break;
- }
- const char *option_value = argv[i + 1];
- it->second->set(option_value);
- i++;
- } else {
- printf("Ignoring unrecognized option: %s.\n", argv[i]);
- printf("Usage: %s {option value}\n", argv[0]);
- printf("\tTakes text from stdin and produces pdf file.\n");
- printf("Supported options:\n");
- for (BaseOption *opt : option_list) {
- printf("\t%s\t%s (%s)\n", opt->selector.c_str(),
- opt->description.c_str(), opt->valueToString().c_str());
- }
- exit(-1);
- }
- }
- }
- struct DoubleOption : Option<double> {
- virtual void set(std::string _value) { value = atof(_value.c_str()); }
- virtual std::string valueToString() {
- std::ostringstream stm;
- stm << value;
- return stm.str();
- }
- DoubleOption(std::string _selector,
- std::string _description,
- double defaultValue)
- : Option<double>(_selector, _description, defaultValue) {}
- };
- struct StringOption : Option<std::string> {
- virtual void set(std::string _value) { value = _value; }
- virtual std::string valueToString() { return value; }
- StringOption(std::string _selector,
- std::string _description,
- std::string defaultValue)
- : Option<std::string>(_selector, _description, defaultValue) {}
- };
- // Config //////////////////////////////////////////////////////////////////////
- struct Config {
- DoubleOption page_width = DoubleOption("-w", "Page width", 600.0f);
- DoubleOption page_height = DoubleOption("-h", "Page height", 800.0f);
- StringOption title = StringOption("-t", "PDF title", "---");
- StringOption author = StringOption("-a", "PDF author", "---");
- StringOption subject = StringOption("-k", "PDF subject", "---");
- StringOption keywords = StringOption("-c", "PDF keywords", "---");
- StringOption creator = StringOption("-t", "PDF creator", "---");
- StringOption font_file = StringOption("-f", ".ttf font file", "");
- DoubleOption font_size = DoubleOption("-z", "Font size", 8.0f);
- DoubleOption left_margin = DoubleOption("-m", "Left margin", 20.0f);
- DoubleOption line_spacing_ratio =
- DoubleOption("-h", "Line spacing ratio", 0.25f);
- StringOption output_file_name =
- StringOption("-o", ".pdf output file name", "out-skiahf.pdf");
- Config(int argc, char **argv) {
- BaseOption::Init(std::vector<BaseOption*>{
- &page_width, &page_height, &title, &author, &subject,
- &keywords, &creator, &font_file, &font_size, &left_margin,
- &line_spacing_ratio, &output_file_name}, argc, argv);
- }
- };
- // Placement ///////////////////////////////////////////////////////////////////
- class Placement {
- public:
- Placement(const Config* conf, SkDocument *doc)
- : config(conf), document(doc), pageCanvas(nullptr) {
- white_paint.setColor(SK_ColorWHITE);
- glyph_paint.setColor(SK_ColorBLACK);
- glyph_paint.setAntiAlias(true);
- font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
- font.setSubpixel(true);
- font.setSize(SkDoubleToScalar(config->font_size.value));
- }
- void WriteLine(const SkShaper& shaper, const char *text, size_t textBytes) {
- SkTextBlobBuilderRunHandler textBlobBuilder(text, {0, 0});
- shaper.shape(text, textBytes, font, true,
- config->page_width.value - 2*config->left_margin.value, &textBlobBuilder);
- SkPoint endPoint = textBlobBuilder.endPoint();
- sk_sp<const SkTextBlob> blob = textBlobBuilder.makeBlob();
- // If we don't have a page, or if we're not at the start of the page and the blob won't fit
- if (!pageCanvas ||
- (current_y > config->line_spacing_ratio.value * config->font_size.value &&
- current_y + endPoint.y() > config->page_height.value)
- ) {
- if (pageCanvas) {
- document->endPage();
- }
- pageCanvas = document->beginPage(
- SkDoubleToScalar(config->page_width.value),
- SkDoubleToScalar(config->page_height.value));
- pageCanvas->drawPaint(white_paint);
- current_x = config->left_margin.value;
- current_y = config->line_spacing_ratio.value * config->font_size.value;
- }
- pageCanvas->drawTextBlob(
- blob.get(), SkDoubleToScalar(current_x),
- SkDoubleToScalar(current_y), glyph_paint);
- // Advance to the next line.
- current_y += endPoint.y() + config->line_spacing_ratio.value * config->font_size.value;
- }
- private:
- const Config* config;
- SkDocument *document;
- SkCanvas *pageCanvas;
- SkPaint white_paint;
- SkPaint glyph_paint;
- SkFont font;
- double current_x;
- double current_y;
- };
- ////////////////////////////////////////////////////////////////////////////////
- static sk_sp<SkDocument> MakePDFDocument(const Config &config, SkWStream *wStream) {
- SkPDF::Metadata pdf_info;
- pdf_info.fTitle = config.title.value.c_str();
- pdf_info.fAuthor = config.author.value.c_str();
- pdf_info.fSubject = config.subject.value.c_str();
- pdf_info.fKeywords = config.keywords.value.c_str();
- pdf_info.fCreator = config.creator.value.c_str();
- #if 0
- SkTime::DateTime now;
- SkTime::GetDateTime(&now);
- pdf_info.fCreation = now;
- pdf_info.fModified = now;
- pdf_info.fPDFA = true;
- #endif
- return SkPDF::MakeDocument(wStream, pdf_info);
- }
- int main(int argc, char **argv) {
- Config config(argc, argv);
- SkFILEWStream wStream(config.output_file_name.value.c_str());
- sk_sp<SkDocument> doc = MakePDFDocument(config, &wStream);
- assert(doc);
- Placement placement(&config, doc.get());
- const std::string &font_file = config.font_file.value;
- sk_sp<SkTypeface> typeface;
- if (font_file.size() > 0) {
- typeface = SkTypeface::MakeFromFile(font_file.c_str(), 0 /* index */);
- }
- std::unique_ptr<SkShaper> shaper = SkShaper::Make();
- assert(shaper);
- //SkString line("This is هذا هو الخط a line.");
- //SkString line("This is a line هذا هو الخط.");
- for (std::string line; std::getline(std::cin, line);) {
- placement.WriteLine(*shaper, line.c_str(), line.size());
- }
- doc->close();
- wStream.flush();
- return 0;
- }
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