65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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REG_FIDDLE(PDF, 256, 256, true, 0) {
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// Here is an example of using Skia’s PDF backend (SkPDF) via the SkDocument
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// and SkCanvas APIs.
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void WritePDF(SkWStream* outputStream,
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const char* documentTitle,
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void (*writePage)(SkCanvas*, int page),
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int numberOfPages,
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SkSize pageSize) {
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SkPDF::Metadata metadata;
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metadata.fTitle = documentTitle;
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metadata.fCreator = "Example WritePDF() Function";
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metadata.fCreation = {0, 2019, 1, 4, 31, 12, 34, 56};
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metadata.fModified = {0, 2019, 1, 4, 31, 12, 34, 56};
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auto pdfDocument = SkPDF::MakeDocument(outputStream, metadata);
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SkASSERT(pdfDocument);
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for (int page = 0; page < numberOfPages; ++page) {
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SkCanvas* pageCanvas = pdfDocument->beginPage(pageSize.width(),
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pageSize.height());
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writePage(pageCanvas, page);
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pdfDocument->endPage();
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}
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pdfDocument->close();
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}
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// Print binary data to stdout as hex.
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void print_data(const SkData* data, const char* name) {
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if (data) {
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SkDebugf("\nxxd -r -p > %s << EOF", name);
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size_t s = data->size();
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const uint8_t* d = data->bytes();
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for (size_t i = 0; i < s; ++i) {
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if (i % 40 == 0) { SkDebugf("\n"); }
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SkDebugf("%02x", d[i]);
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}
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SkDebugf("\nEOF\n\n");
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}
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}
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// example function that draws on a SkCanvas.
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void write_page(SkCanvas* canvas, int) {
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const SkScalar R = 115.2f, C = 128.0f;
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SkPath path;
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path.moveTo(C + R, C);
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for (int i = 1; i < 8; ++i) {
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SkScalar a = 2.6927937f * i;
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path.lineTo(C + R * cos(a), C + R * sin(a));
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}
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawPath(path, paint);
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}
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void draw(SkCanvas*) {
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constexpr SkSize ansiLetterSize{8.5f * 72, 11.0f * 72};
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SkDynamicMemoryWStream buffer;
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WritePDF(&buffer, "SkPDF Example", &write_page, 1, ansiLetterSize);
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sk_sp<SkData> pdfData = buffer.detachAsData();
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print_data(pdfData.get(), "skpdf_example.pdf");
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}
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} // END FIDDLE
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