950243df0e
- rename LineHandler -> RunHandler (since it gets called per run) - pass additionl run info: * line index * cumulative advance * ascent/descent/leading Bug: skia: Change-Id: Ie848e5a35243088b99989c73fdec44c6a1bdd051 Reviewed-on: https://skia-review.googlesource.com/c/183300 Reviewed-by: Ben Wagner <bungeman@google.com> Commit-Queue: Florin Malita <fmalita@chromium.org>
84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkShaper_DEFINED
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#define SkShaper_DEFINED
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#include <memory>
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#include "SkPoint.h"
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#include "SkTextBlob.h"
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#include "SkTypeface.h"
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class SkFont;
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/**
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Shapes text using HarfBuzz and places the shaped text into a
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client-managed buffer.
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If compiled without HarfBuzz, fall back on SkPaint::textToGlyphs.
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*/
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class SkShaper {
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public:
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SkShaper(sk_sp<SkTypeface> face);
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~SkShaper();
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class RunHandler {
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public:
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virtual ~RunHandler() = default;
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struct RunInfo {
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size_t fLineIndex;
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SkVector fAdvance;
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SkScalar fAscent,
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fDescent,
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fLeading;
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};
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struct Buffer {
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SkGlyphID* glyphs; // required
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SkPoint* positions; // required
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char* utf8text; // optional
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uint32_t* clusters; // optional
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};
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virtual Buffer newRunBuffer(const RunInfo&, const SkFont&, int glyphCount,
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int utf8textCount) = 0;
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};
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bool good() const;
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SkPoint shape(RunHandler* handler,
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const SkFont& srcPaint,
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const char* utf8text,
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size_t textBytes,
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bool leftToRight,
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SkPoint point,
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SkScalar width) const;
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private:
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SkShaper(const SkShaper&) = delete;
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SkShaper& operator=(const SkShaper&) = delete;
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struct Impl;
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std::unique_ptr<Impl> fImpl;
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};
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/**
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* Helper for shaping text directly into a SkTextBlob.
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*/
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class SkTextBlobBuilderRunHandler final : public SkShaper::RunHandler {
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public:
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sk_sp<SkTextBlob> makeBlob();
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SkShaper::RunHandler::Buffer newRunBuffer(const RunInfo&, const SkFont&, int, int) override;
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private:
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SkTextBlobBuilder fBuilder;
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};
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#endif // SkShaper_DEFINED
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