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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 {
// Do an sprintf starting at offset n, abort on overflow
static int snprintfcat(char* buf, int off, int size, const char* format, ...)
__attribute__((__format__(__printf__, 4, 5)));
static int snprintfcat(char* buf, int off, int size, const char* format, ...) {
va_list args;
va_start(args, format);
int n = vsnprintf(buf + off, size - off, format, args);
LOG_ALWAYS_FATAL_IF(n >= size - off, "String overflow in setting layout properties");
va_end(args);
return off + n;
}
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) {
TypefaceImpl* resolvedFace = TypefaceImpl_resolveDefault(typeface);
layout->setFontCollection(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 */
MinikinPaint minikinPaint;
minikinPaint.size = (int)/*WHY?!*/paint->getTextSize();
minikinPaint.scaleX = paint->getTextScaleX();
minikinPaint.skewX = paint->getTextSkewX();
minikinPaint.letterSpacing = paint->getLetterSpacing();
minikinPaint.paintFlags = MinikinFontSkia::packPaintFlags(paint);
minikinPaint.fontFeatureSettings = paint->getFontFeatureSettings();
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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