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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 "SkPaint.h"
#include "minikin/Layout.h"
#include "TypefaceImpl.h"
#include "MinikinSkia.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, ...) {
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::SetLayoutProperties(Layout* layout, const SkPaint* paint, int flags,
TypefaceImpl* typeface) {
TypefaceImpl* resolvedFace = TypefaceImpl_resolveDefault(typeface);
layout->setFontCollection(resolvedFace->fFontCollection);
FontStyle style = resolvedFace->fStyle;
char css[256];
int off = snprintfcat(css, 0, sizeof(css),
"font-size: %d; font-scale-x: %f; font-skew-x: %f; -paint-flags: %d;"
" font-weight: %d; font-style: %s; -minikin-bidi: %d;",
(int)paint->getTextSize(),
paint->getTextScaleX(),
paint->getTextSkewX(),
MinikinFontSkia::packPaintFlags(paint),
style.getWeight() * 100,
style.getItalic() ? "italic" : "normal",
flags);
SkString langString = paint->getPaintOptionsAndroid().getLanguage().getTag();
off = snprintfcat(css, off, sizeof(css), " lang: %s;", langString.c_str());
SkPaintOptionsAndroid::FontVariant var = paint->getPaintOptionsAndroid().getFontVariant();
const char* varstr = var == SkPaintOptionsAndroid::kElegant_Variant ? "elegant" : "compact";
off = snprintfcat(css, off, sizeof(css), " -minikin-variant: %s;", varstr);
layout->setProperties(css);
}
float MinikinUtils::xOffsetForTextAlign(SkPaint* paint, const Layout& layout) {
switch (paint->getTextAlign()) {
case SkPaint::kCenter_Align:
return layout.getAdvance() * -0.5f;
break;
case SkPaint::kRight_Align:
return -layout.getAdvance();
break;
default:
break;
}
return 0;
}
}
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