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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 <hb.h>
#include <vector>
#include <minikin/FontCollection.h>
#include <minikin/MinikinFontFreeType.h>
namespace android {
// The Bitmap class is for debugging. We'll probably move it out
// of here into a separate lightweight software rendering module
// (optional, as we'd hope most clients would do their own)
class Bitmap {
public:
Bitmap(int width, int height);
~Bitmap();
void writePnm(std::ofstream& o) const;
void drawGlyph(const GlyphBitmap& bitmap, int x, int y);
private:
int width;
int height;
uint8_t* buf;
};
struct LayoutGlyph {
// index into mFaces and mHbFonts vectors. We could imagine
// moving this into a run length representation, because it's
// more efficient for long strings, and we'll probably need
// something like that for paint attributes (color, underline,
// fake b/i, etc), as having those per-glyph is bloated.
int font_ix;
unsigned int glyph_id;
float x;
float y;
};
// Internal state used during layout operation
class LayoutContext;
// 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.
// The lifetime of the FontCollection set through setFontCollection must
// extend through the lifetime of the Layout object.
class Layout {
public:
void dump() const;
void setFontCollection(const FontCollection* collection);
void doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
int bidiFlags, const FontStyle &style, const MinikinPaint &paint);
void draw(Bitmap*, int x0, int y0, float size) const;
// This must be called before any invocations.
// TODO: probably have a factory instead
static void init();
// public accessors
size_t nGlyphs() const;
// Does not bump reference; ownership is still layout
MinikinFont *getFont(int i) const;
FontFakery getFakery(int i) const;
unsigned int getGlyphId(int i) const;
float getX(int i) const;
float getY(int i) const;
float getAdvance() const;
// Get advances, copying into caller-provided buffer. The size of this
// buffer must match the length of the string (nchars arg to doLayout).
void getAdvances(float* advances);
void getBounds(MinikinRect* rect);
// Purge all caches, useful in low memory conditions
static void purgeCaches();
private:
// Find a face in the mFaces vector, or create a new entry
int findFace(FakedFont face, LayoutContext* ctx);
// Lay out a single bidi run
void doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
bool isRtl, LayoutContext* ctx, size_t dstStart);
// Lay out a single word
void doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
bool isRtl, LayoutContext* ctx, size_t bufStart);
// Lay out a single bidi run
void doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
bool isRtl, LayoutContext* ctx);
// Append another layout (for example, cached value) into this one
void appendLayout(Layout* src, size_t start);
std::vector<LayoutGlyph> mGlyphs;
std::vector<float> mAdvances;
const FontCollection* mCollection;
std::vector<FakedFont> mFaces;
float mAdvance;
MinikinRect mBounds;
};
} // namespace android
#endif // MINIKIN_LAYOUT_H
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