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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_FONT_H
#define MINIKIN_FONT_H
#include <string>
#include <minikin/MinikinRefCounted.h>
#include <minikin/FontFamily.h>
// An abstraction for platform fonts, allowing Minikin to be used with
// multiple actual implementations of fonts.
namespace android {
// The hyphen edit represents an edit to the string when a word is
// hyphenated. The most common hyphen edit is adding a "-" at the end
// of a syllable, but nonstandard hyphenation allows for more choices.
class HyphenEdit {
public:
HyphenEdit() : hyphen(0) { }
HyphenEdit(uint32_t hyphenInt) : hyphen(hyphenInt) { }
bool hasHyphen() const { return hyphen != 0; }
private:
uint32_t hyphen;
};
class MinikinFont;
// Possibly move into own .h file?
// Note: if you add a field here, either add it to LayoutCacheKey or to skipCache()
struct MinikinPaint {
MinikinPaint() : font(0), size(0), scaleX(0), skewX(0), letterSpacing(0), paintFlags(0),
fakery(), fontFeatureSettings() { }
bool skipCache() const {
// TODO: add hyphen to cache
return !fontFeatureSettings.empty() || hyphenEdit.hasHyphen();
}
MinikinFont *font;
float size;
float scaleX;
float skewX;
float letterSpacing;
uint32_t paintFlags;
FontFakery fakery;
HyphenEdit hyphenEdit;
std::string fontFeatureSettings;
};
// Only a few flags affect layout, but those that do should have values
// consistent with Android's paint flags.
enum MinikinPaintFlags {
LinearTextFlag = 0x40,
};
struct MinikinRect {
float mLeft, mTop, mRight, mBottom;
bool isEmpty() const {
return mLeft == mRight || mTop == mBottom;
}
void set(const MinikinRect& r) {
mLeft = r.mLeft;
mTop = r.mTop;
mRight = r.mRight;
mBottom = r.mBottom;
}
void offset(float dx, float dy) {
mLeft += dx;
mTop += dy;
mRight += dx;
mBottom += dy;
}
void setEmpty() {
mLeft = mTop = mRight = mBottom = 0;
}
void join(const MinikinRect& r);
};
class MinikinFontFreeType;
class MinikinFont : public MinikinRefCounted {
public:
virtual bool GetGlyph(uint32_t codepoint, uint32_t *glyph) const = 0;
virtual float GetHorizontalAdvance(uint32_t glyph_id,
const MinikinPaint &paint) const = 0;
virtual void GetBounds(MinikinRect* bounds, uint32_t glyph_id,
const MinikinPaint &paint) const = 0;
// If buf is NULL, just update size
virtual bool GetTable(uint32_t tag, uint8_t *buf, size_t *size) = 0;
virtual int32_t GetUniqueId() const = 0;
static uint32_t MakeTag(char c1, char c2, char c3, char c4) {
return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) |
((uint32_t)c3 << 8) | (uint32_t)c4;
}
};
} // namespace android
#endif // MINIKIN_FONT_H
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