1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* 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 "SkCanvas.h"
#include "SkDocument.h"
#include "SkShaper.h"
#include "SkStream.h"
#include "SkTextBlob.h"
#include "SkTypeface.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", 1.5f);
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.setFlags(SkPaint::kAntiAlias_Flag |
SkPaint::kSubpixelText_Flag);
glyph_paint.setTextSize(SkDoubleToScalar(config->font_size.value));
}
void WriteLine(const SkShaper& shaper, const char *text, size_t textBytes) {
if (!pageCanvas || current_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;
}
SkTextBlobBuilder textBlobBuilder;
shaper.shape(&textBlobBuilder, glyph_paint, text, textBytes, SkPoint{0, 0});
sk_sp<const SkTextBlob> blob = textBlobBuilder.make();
pageCanvas->drawTextBlob(
blob.get(), SkDoubleToScalar(current_x),
SkDoubleToScalar(current_y), glyph_paint);
// Advance to the next line.
current_y += config->line_spacing_ratio.value * config->font_size.value;
}
private:
const Config* config;
SkDocument *document;
SkCanvas *pageCanvas;
SkPaint white_paint;
SkPaint glyph_paint;
double current_x;
double current_y;
};
////////////////////////////////////////////////////////////////////////////////
static sk_sp<SkDocument> MakePDFDocument(const Config &config,
SkWStream *wStream) {
SkDocument::PDFMetadata 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();
bool pdfa = false;
#if 0
SkTime::DateTime now;
SkTime::GetDateTime(&now);
pdf_info.fCreation.fEnabled = true;
pdf_info.fCreation.fDateTime = now;
pdf_info.fModified.fEnabled = true;
pdf_info.fModified.fDateTime = now;
pdfa = true;
#endif
return SkDocument::MakePDF(wStream, SK_ScalarDefaultRasterDPI, pdf_info,
nullptr, pdfa);
}
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 */);
}
SkShaper shaper(typeface);
assert(shaper.good());
for (std::string line; std::getline(std::cin, line);) {
placement.WriteLine(shaper, line.c_str(), line.size());
}
doc->close();
return 0;
}
|
