| /* |
| * 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()); |
| } |
| |
| } |