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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 ANDROID_GRAPHICS_PAINT_H_
#define ANDROID_GRAPHICS_PAINT_H_
#include "Typeface.h"
#include <cutils/compiler.h>
#include <SkDrawLooper.h>
#include <SkFont.h>
#include <SkPaint.h>
#include <string>
#include <minikin/FontFamily.h>
#include <minikin/FamilyVariant.h>
#include <minikin/Hyphenator.h>
namespace android {
class ANDROID_API Paint : public SkPaint {
public:
// Default values for underlined and strikethrough text,
// as defined by Skia in SkTextFormatParams.h.
constexpr static float kStdStrikeThru_Offset = (-6.0f / 21.0f);
constexpr static float kStdUnderline_Offset = (1.0f / 9.0f);
constexpr static float kStdUnderline_Thickness = (1.0f / 18.0f);
constexpr static float kStdUnderline_Top =
kStdUnderline_Offset - 0.5f * kStdUnderline_Thickness;
constexpr static float kStdStrikeThru_Thickness = kStdUnderline_Thickness;
constexpr static float kStdStrikeThru_Top =
kStdStrikeThru_Offset - 0.5f * kStdStrikeThru_Thickness;
Paint();
Paint(const Paint& paint);
~Paint();
Paint& operator=(const Paint& other);
friend bool operator==(const Paint& a, const Paint& b);
friend bool operator!=(const Paint& a, const Paint& b) { return !(a == b); }
SkFont& getSkFont() { return mFont; }
const SkFont& getSkFont() const { return mFont; }
SkDrawLooper* getLooper() const { return mLooper.get(); }
void setLooper(sk_sp<SkDrawLooper> looper) { mLooper = std::move(looper); }
// These shadow the methods on SkPaint, but we need to so we can keep related
// attributes in-sync.
void reset();
void setAntiAlias(bool);
bool nothingToDraw() const { return !mLooper && SkPaint::nothingToDraw(); }
// End method shadowing
void setLetterSpacing(float letterSpacing) { mLetterSpacing = letterSpacing; }
float getLetterSpacing() const { return mLetterSpacing; }
void setWordSpacing(float wordSpacing) { mWordSpacing = wordSpacing; }
float getWordSpacing() const { return mWordSpacing; }
void setFontFeatureSettings(const std::string& fontFeatureSettings) {
mFontFeatureSettings = fontFeatureSettings;
}
std::string getFontFeatureSettings() const { return mFontFeatureSettings; }
void setMinikinLocaleListId(uint32_t minikinLocaleListId) {
mMinikinLocaleListId = minikinLocaleListId;
}
uint32_t getMinikinLocaleListId() const { return mMinikinLocaleListId; }
void setFamilyVariant(minikin::FamilyVariant variant) { mFamilyVariant = variant; }
minikin::FamilyVariant getFamilyVariant() const { return mFamilyVariant; }
void setStartHyphenEdit(uint32_t startHyphen) {
mHyphenEdit = minikin::packHyphenEdit(
static_cast<minikin::StartHyphenEdit>(startHyphen),
minikin::endHyphenEdit(mHyphenEdit));
}
void setEndHyphenEdit(uint32_t endHyphen) {
mHyphenEdit = minikin::packHyphenEdit(
minikin::startHyphenEdit(mHyphenEdit),
static_cast<minikin::EndHyphenEdit>(endHyphen));
}
minikin::StartHyphenEdit getStartHyphenEdit() const {
return minikin::startHyphenEdit(mHyphenEdit);
}
minikin::EndHyphenEdit getEndHyphenEdit() const {
return minikin::endHyphenEdit(mHyphenEdit);
}
void setAndroidTypeface(Typeface* typeface) { mTypeface = typeface; }
const Typeface* getAndroidTypeface() const { return mTypeface; }
enum Align {
kLeft_Align,
kCenter_Align,
kRight_Align,
};
Align getTextAlign() const { return mAlign; }
void setTextAlign(Align align) { mAlign = align; }
bool isStrikeThru() const { return mStrikeThru; }
void setStrikeThru(bool st) { mStrikeThru = st; }
bool isUnderline() const { return mUnderline; }
void setUnderline(bool u) { mUnderline = u; }
bool isDevKern() const { return mDevKern; }
void setDevKern(bool d) { mDevKern = d; }
// The Java flags (Paint.java) no longer fit into the native apis directly.
// These methods handle converting to and from them and the native representations
// in android::Paint.
uint32_t getJavaFlags() const;
void setJavaFlags(uint32_t);
// Helpers that return or apply legacy java flags to SkPaint, ignoring all flags
// that are meant for SkFont or Paint (e.g. underline, strikethru)
// The only respected flags are : [ antialias, dither, filterBitmap ]
static uint32_t GetSkPaintJavaFlags(const SkPaint&);
static void SetSkPaintJavaFlags(SkPaint*, uint32_t flags);
private:
SkFont mFont;
sk_sp<SkDrawLooper> mLooper;
float mLetterSpacing = 0;
float mWordSpacing = 0;
std::string mFontFeatureSettings;
uint32_t mMinikinLocaleListId;
minikin::FamilyVariant mFamilyVariant;
uint32_t mHyphenEdit = 0;
// The native Typeface object has the same lifetime of the Java Typeface
// object. The Java Paint object holds a strong reference to the Java Typeface
// object. Thus, following pointer can never be a dangling pointer. Note that
// nullptr is valid: it means the default typeface.
const Typeface* mTypeface = nullptr;
Align mAlign = kLeft_Align;
bool mStrikeThru = false;
bool mUnderline = false;
bool mDevKern = false;
};
} // namespace android
#endif // ANDROID_GRAPHICS_PAINT_H_
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