// Copyright 2018 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 "SkPDFSubsetFont.h"
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#if defined(SK_PDF_USE_SFNTLY)
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#include "sample/chromium/font_subsetter.h"
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#include <vector>
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sk_sp<SkData> SkPDFSubsetFont(sk_sp<SkData> fontData,
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const SkPDFGlyphUse& glyphUsage,
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const char* fontName,
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int ttcIndex) {
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// Generate glyph id array in format needed by sfntly.
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// TODO(halcanary): sfntly should take a more compact format.
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std::vector<unsigned> subset;
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if (!glyphUsage.has(0)) {
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subset.push_back(0); // Always include glyph 0.
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}
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glyphUsage.getSetValues([&subset](unsigned v) { subset.push_back(v); });
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unsigned char* subsetFont{nullptr};
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#if defined(SK_BUILD_FOR_GOOGLE3)
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// TODO(halcanary): update SK_BUILD_FOR_GOOGLE3 to newest version of Sfntly.
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(void)ttcIndex;
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int subsetFontSize = SfntlyWrapper::SubsetFont(fontName,
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fontData->bytes(),
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fontData->size(),
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subset.data(),
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subset.size(),
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&subsetFont);
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#else
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(void)fontName;
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int subsetFontSize = SfntlyWrapper::SubsetFont(ttcIndex,
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fontData->bytes(),
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fontData->size(),
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subset.data(),
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subset.size(),
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&subsetFont);
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#endif
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SkASSERT(subsetFontSize > 0 || subsetFont == nullptr);
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if (subsetFontSize < 1 || subsetFont == nullptr) {
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return nullptr;
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}
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return SkData::MakeWithProc(subsetFont, subsetFontSize,
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[](const void* p, void*) { delete[] (unsigned char*)p; },
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nullptr);
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}
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#endif
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