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/*
* Copyright (C) 2014 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.
*/
#define LOG_TAG "Minikin"
#include <cutils/log.h>
#include <string>
#include "SkPathMeasure.h"
#include "Paint.h"
#include "TypefaceImpl.h"
#include "MinikinUtils.h"
namespace android {
FontStyle MinikinUtils::prepareMinikinPaint(MinikinPaint* minikinPaint, FontCollection** pFont,
const Paint* paint, TypefaceImpl* typeface) {
const TypefaceImpl* resolvedFace = TypefaceImpl_resolveDefault(typeface);
*pFont = resolvedFace->fFontCollection;
FontStyle resolved = resolvedFace->fStyle;
/* Prepare minikin FontStyle */
std::string lang = paint->getTextLocale();
FontLanguage minikinLang(lang.c_str(), lang.size());
FontVariant minikinVariant = (paint->getFontVariant() == VARIANT_ELEGANT) ? VARIANT_ELEGANT
: VARIANT_COMPACT;
FontStyle minikinStyle(minikinLang, minikinVariant, resolved.getWeight(), resolved.getItalic());
/* Prepare minikin Paint */
// Note: it would be nice to handle fractional size values (it would improve smooth zoom
// behavior), but historically size has been treated as an int.
// TODO: explore whether to enable fractional sizes, possibly when linear text flag is set.
minikinPaint->size = (int)paint->getTextSize();
minikinPaint->scaleX = paint->getTextScaleX();
minikinPaint->skewX = paint->getTextSkewX();
minikinPaint->letterSpacing = paint->getLetterSpacing();
minikinPaint->paintFlags = MinikinFontSkia::packPaintFlags(paint);
minikinPaint->fontFeatureSettings = paint->getFontFeatureSettings();
minikinPaint->hyphenEdit = HyphenEdit(paint->getHyphenEdit());
return minikinStyle;
}
void MinikinUtils::doLayout(Layout* layout, const Paint* paint, int bidiFlags,
TypefaceImpl* typeface, const uint16_t* buf, size_t start, size_t count,
size_t bufSize) {
FontCollection *font;
MinikinPaint minikinPaint;
FontStyle minikinStyle = prepareMinikinPaint(&minikinPaint, &font, paint, typeface);
layout->setFontCollection(font);
layout->doLayout(buf, start, count, bufSize, bidiFlags, minikinStyle, minikinPaint);
}
float MinikinUtils::xOffsetForTextAlign(Paint* paint, const Layout& layout) {
switch (paint->getTextAlign()) {
case Paint::kCenter_Align:
return layout.getAdvance() * -0.5f;
break;
case Paint::kRight_Align:
return -layout.getAdvance();
break;
default:
break;
}
return 0;
}
float MinikinUtils::hOffsetForTextAlign(Paint* paint, const Layout& layout, const SkPath& path) {
float align = 0;
switch (paint->getTextAlign()) {
case Paint::kCenter_Align:
align = -0.5f;
break;
case Paint::kRight_Align:
align = -1;
break;
default:
return 0;
}
SkPathMeasure measure(path, false);
return align * (layout.getAdvance() - measure.getLength());
}
}
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