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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MINIKIN_LAYOUT_H
#define MINIKIN_LAYOUT_H
#include <memory>
#include <unordered_map>
#include <vector>
#include <gtest/gtest_prod.h>
#include "minikin/FontCollection.h"
#include "minikin/LayoutCore.h"
#include "minikin/Range.h"
#include "minikin/U16StringPiece.h"
namespace minikin {
class Layout;
struct LayoutPieces;
struct LayoutGlyph {
LayoutGlyph(FakedFont font, uint32_t glyph_id, float x, float y)
: font(font), glyph_id(glyph_id), x(x), y(y) {}
FakedFont font;
uint32_t glyph_id;
float x;
float y;
};
// Must be the same value with Paint.java
enum class Bidi : uint8_t {
LTR = 0b0000, // Must be same with Paint.BIDI_LTR
RTL = 0b0001, // Must be same with Paint.BIDI_RTL
DEFAULT_LTR = 0b0010, // Must be same with Paint.BIDI_DEFAULT_LTR
DEFAULT_RTL = 0b0011, // Must be same with Paint.BIDI_DEFAULT_RTL
FORCE_LTR = 0b0100, // Must be same with Paint.BIDI_FORCE_LTR
FORCE_RTL = 0b0101, // Must be same with Paint.BIDI_FORCE_RTL
};
inline bool isRtl(Bidi bidi) {
return static_cast<uint8_t>(bidi) & 0b0001;
}
inline bool isOverride(Bidi bidi) {
return static_cast<uint8_t>(bidi) & 0b0100;
}
// Lifecycle and threading assumptions for Layout:
// The object is assumed to be owned by a single thread; multiple threads
// may not mutate it at the same time.
class Layout {
public:
Layout(const U16StringPiece& str, const Range& range, Bidi bidiFlags, const MinikinPaint& paint,
StartHyphenEdit startHyphen, EndHyphenEdit endHyphen)
: mAdvance(0) {
doLayout(str, range, bidiFlags, paint, startHyphen, endHyphen);
}
Layout(uint32_t count) : mAdvance(0) {
mAdvances.resize(count, 0);
mGlyphs.reserve(count);
}
static float measureText(const U16StringPiece& str, const Range& range, Bidi bidiFlags,
const MinikinPaint& paint, StartHyphenEdit startHyphen,
EndHyphenEdit endHyphen, float* advances) {
return measureText(str, range, bidiFlags, paint, startHyphen, endHyphen, advances, nullptr);
}
static float measureText(const U16StringPiece& str, const Range& range, Bidi bidiFlags,
const MinikinPaint& paint, StartHyphenEdit startHyphen,
EndHyphenEdit endHyphen, float* advances, MinikinRect* bounds);
const std::vector<float>& advances() const { return mAdvances; }
// public accessors
size_t nGlyphs() const { return mGlyphs.size(); }
const Font* getFont(int i) const { return mGlyphs[i].font.font.get(); }
const std::shared_ptr<Font>& getFontRef(int i) const { return mGlyphs[i].font.font; }
FontFakery getFakery(int i) const { return mGlyphs[i].font.fakery; }
const std::shared_ptr<MinikinFont>& typeface(int i) const { return mGlyphs[i].font.typeface(); }
unsigned int getGlyphId(int i) const { return mGlyphs[i].glyph_id; }
float getX(int i) const { return mGlyphs[i].x; }
float getY(int i) const { return mGlyphs[i].y; }
float getAdvance() const { return mAdvance; }
float getCharAdvance(size_t i) const { return mAdvances[i]; }
const std::vector<float>& getAdvances() const { return mAdvances; }
// Purge all caches, useful in low memory conditions
static void purgeCaches();
// Dump minikin internal statistics, cache usage, cache hit ratio, etc.
static void dumpMinikinStats(int fd);
// Append another layout (for example, cached value) into this one
void appendLayout(const LayoutPiece& src, size_t start, float extraAdvance);
private:
FRIEND_TEST(LayoutTest, doLayoutWithPrecomputedPiecesTest);
void doLayout(const U16StringPiece& str, const Range& range, Bidi bidiFlags,
const MinikinPaint& paint, StartHyphenEdit startHyphen, EndHyphenEdit endHyphen);
// Lay out a single bidi run
// When layout is not null, layout info will be stored in the object.
// When advances is not null, measurement results will be stored in the array.
static float doLayoutRunCached(const U16StringPiece& textBuf, const Range& range, bool isRtl,
const MinikinPaint& paint, size_t dstStart,
StartHyphenEdit startHyphen, EndHyphenEdit endHyphen,
Layout* layout, float* advances, MinikinRect* bounds);
// Lay out a single word
static float doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
bool isRtl, const MinikinPaint& paint, size_t bufStart,
StartHyphenEdit startHyphen, EndHyphenEdit endHyphen, Layout* layout,
float* advances, MinikinRect* bounds);
// Lay out a single bidi run
void doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize, bool isRtl,
const MinikinPaint& paint, StartHyphenEdit startHyphen,
EndHyphenEdit endHyphen, MinikinRect* bounds);
std::vector<LayoutGlyph> mGlyphs;
// This vector defined per code unit, so their length is identical to the input text.
std::vector<float> mAdvances;
float mAdvance;
};
} // namespace minikin
#endif // MINIKIN_LAYOUT_H
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