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707bbae8ff
Use log/log.h to harden code against liblog changes. Test: compile Bug: 30465923 Change-Id: I3dea82e76d28d9ef52d7c0f11e038c4298863eb9
975 lines
33 KiB
C++
975 lines
33 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Minikin"
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#include <algorithm>
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#include <fstream>
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#include <iostream> // for debugging
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#include <math.h>
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#include <string>
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#include <unicode/ubidi.h>
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#include <vector>
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#include <log/log.h>
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#include <utils/JenkinsHash.h>
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#include <utils/LruCache.h>
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#include <utils/Singleton.h>
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#include <utils/String16.h>
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#include <hb-icu.h>
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#include <hb-ot.h>
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#include "FontLanguage.h"
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#include "FontLanguageListCache.h"
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#include "HbFontCache.h"
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#include "LayoutUtils.h"
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#include "MinikinInternal.h"
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#include <minikin/MinikinFontFreeType.h>
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#include <minikin/Layout.h>
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using std::string;
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using std::vector;
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namespace minikin {
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Bitmap::Bitmap(int width, int height) : width(width), height(height) {
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buf = new uint8_t[width * height]();
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}
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Bitmap::~Bitmap() {
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delete[] buf;
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}
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void Bitmap::writePnm(std::ofstream &o) const {
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o << "P5" << std::endl;
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o << width << " " << height << std::endl;
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o << "255" << std::endl;
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o.write((const char *)buf, width * height);
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o.close();
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}
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void Bitmap::drawGlyph(const android::GlyphBitmap& bitmap, int x, int y) {
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int bmw = bitmap.width;
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int bmh = bitmap.height;
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x += bitmap.left;
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y -= bitmap.top;
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int x0 = std::max(0, x);
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int x1 = std::min(width, x + bmw);
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int y0 = std::max(0, y);
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int y1 = std::min(height, y + bmh);
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const unsigned char* src = bitmap.buffer + (y0 - y) * bmw + (x0 - x);
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uint8_t* dst = buf + y0 * width;
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for (int yy = y0; yy < y1; yy++) {
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for (int xx = x0; xx < x1; xx++) {
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int pixel = (int)dst[xx] + (int)src[xx - x];
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pixel = pixel > 0xff ? 0xff : pixel;
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dst[xx] = pixel;
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}
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src += bmw;
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dst += width;
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}
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}
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} // namespace minikin
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namespace android {
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const int kDirection_Mask = 0x1;
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struct LayoutContext {
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MinikinPaint paint;
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FontStyle style;
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std::vector<hb_font_t*> hbFonts; // parallel to mFaces
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void clearHbFonts() {
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for (size_t i = 0; i < hbFonts.size(); i++) {
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hb_font_set_funcs(hbFonts[i], nullptr, nullptr, nullptr);
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hb_font_destroy(hbFonts[i]);
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}
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hbFonts.clear();
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}
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};
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// Layout cache datatypes
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class LayoutCacheKey {
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public:
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LayoutCacheKey(const FontCollection* collection, const MinikinPaint& paint, FontStyle style,
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const uint16_t* chars, size_t start, size_t count, size_t nchars, bool dir)
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: mChars(chars), mNchars(nchars),
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mStart(start), mCount(count), mId(collection->getId()), mStyle(style),
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mSize(paint.size), mScaleX(paint.scaleX), mSkewX(paint.skewX),
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mLetterSpacing(paint.letterSpacing),
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mPaintFlags(paint.paintFlags), mHyphenEdit(paint.hyphenEdit), mIsRtl(dir),
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mHash(computeHash()) {
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}
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bool operator==(const LayoutCacheKey &other) const;
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hash_t hash() const {
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return mHash;
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}
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void copyText() {
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uint16_t* charsCopy = new uint16_t[mNchars];
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memcpy(charsCopy, mChars, mNchars * sizeof(uint16_t));
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mChars = charsCopy;
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}
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void freeText() {
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delete[] mChars;
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mChars = NULL;
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}
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void doLayout(Layout* layout, LayoutContext* ctx, const FontCollection* collection) const {
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layout->setFontCollection(collection);
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layout->mAdvances.resize(mCount, 0);
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ctx->clearHbFonts();
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layout->doLayoutRun(mChars, mStart, mCount, mNchars, mIsRtl, ctx);
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}
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private:
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const uint16_t* mChars;
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size_t mNchars;
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size_t mStart;
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size_t mCount;
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uint32_t mId; // for the font collection
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FontStyle mStyle;
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float mSize;
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float mScaleX;
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float mSkewX;
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float mLetterSpacing;
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int32_t mPaintFlags;
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HyphenEdit mHyphenEdit;
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bool mIsRtl;
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// Note: any fields added to MinikinPaint must also be reflected here.
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// TODO: language matching (possibly integrate into style)
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hash_t mHash;
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hash_t computeHash() const;
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};
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class LayoutCache : private OnEntryRemoved<LayoutCacheKey, Layout*> {
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public:
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LayoutCache() : mCache(kMaxEntries) {
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mCache.setOnEntryRemovedListener(this);
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}
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void clear() {
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mCache.clear();
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}
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Layout* get(LayoutCacheKey& key, LayoutContext* ctx, const FontCollection* collection) {
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Layout* layout = mCache.get(key);
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if (layout == NULL) {
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key.copyText();
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layout = new Layout();
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key.doLayout(layout, ctx, collection);
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mCache.put(key, layout);
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}
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return layout;
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}
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private:
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// callback for OnEntryRemoved
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void operator()(LayoutCacheKey& key, Layout*& value) {
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key.freeText();
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delete value;
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}
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LruCache<LayoutCacheKey, Layout*> mCache;
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//static const size_t kMaxEntries = LruCache<LayoutCacheKey, Layout*>::kUnlimitedCapacity;
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// TODO: eviction based on memory footprint; for now, we just use a constant
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// number of strings
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static const size_t kMaxEntries = 5000;
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};
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static unsigned int disabledDecomposeCompatibility(hb_unicode_funcs_t*, hb_codepoint_t,
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hb_codepoint_t*, void*) {
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return 0;
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}
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class LayoutEngine : public Singleton<LayoutEngine> {
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public:
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LayoutEngine() {
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unicodeFunctions = hb_unicode_funcs_create(hb_icu_get_unicode_funcs());
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/* Disable the function used for compatibility decomposition */
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hb_unicode_funcs_set_decompose_compatibility_func(
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unicodeFunctions, disabledDecomposeCompatibility, NULL, NULL);
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hbBuffer = hb_buffer_create();
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hb_buffer_set_unicode_funcs(hbBuffer, unicodeFunctions);
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}
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hb_buffer_t* hbBuffer;
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hb_unicode_funcs_t* unicodeFunctions;
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LayoutCache layoutCache;
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};
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ANDROID_SINGLETON_STATIC_INSTANCE(LayoutEngine);
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bool LayoutCacheKey::operator==(const LayoutCacheKey& other) const {
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return mId == other.mId
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&& mStart == other.mStart
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&& mCount == other.mCount
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&& mStyle == other.mStyle
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&& mSize == other.mSize
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&& mScaleX == other.mScaleX
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&& mSkewX == other.mSkewX
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&& mLetterSpacing == other.mLetterSpacing
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&& mPaintFlags == other.mPaintFlags
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&& mHyphenEdit == other.mHyphenEdit
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&& mIsRtl == other.mIsRtl
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&& mNchars == other.mNchars
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&& !memcmp(mChars, other.mChars, mNchars * sizeof(uint16_t));
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}
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hash_t LayoutCacheKey::computeHash() const {
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uint32_t hash = JenkinsHashMix(0, mId);
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hash = JenkinsHashMix(hash, mStart);
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hash = JenkinsHashMix(hash, mCount);
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hash = JenkinsHashMix(hash, hash_type(mStyle));
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hash = JenkinsHashMix(hash, hash_type(mSize));
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hash = JenkinsHashMix(hash, hash_type(mScaleX));
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hash = JenkinsHashMix(hash, hash_type(mSkewX));
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hash = JenkinsHashMix(hash, hash_type(mLetterSpacing));
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hash = JenkinsHashMix(hash, hash_type(mPaintFlags));
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hash = JenkinsHashMix(hash, hash_type(mHyphenEdit.hasHyphen()));
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hash = JenkinsHashMix(hash, hash_type(mIsRtl));
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hash = JenkinsHashMixShorts(hash, mChars, mNchars);
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return JenkinsHashWhiten(hash);
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}
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hash_t hash_type(const LayoutCacheKey& key) {
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return key.hash();
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}
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void MinikinRect::join(const MinikinRect& r) {
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if (isEmpty()) {
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set(r);
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} else if (!r.isEmpty()) {
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mLeft = std::min(mLeft, r.mLeft);
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mTop = std::min(mTop, r.mTop);
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mRight = std::max(mRight, r.mRight);
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mBottom = std::max(mBottom, r.mBottom);
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}
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}
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// Deprecated. Remove when callers are removed.
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void Layout::init() {
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}
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void Layout::reset() {
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mGlyphs.clear();
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mFaces.clear();
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mBounds.setEmpty();
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mAdvances.clear();
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mAdvance = 0;
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}
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void Layout::setFontCollection(const FontCollection* collection) {
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mCollection = collection;
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}
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static hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* /* hbFont */, void* fontData,
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hb_codepoint_t glyph, void* /* userData */) {
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MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData);
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MinikinFont* font = paint->font;
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float advance = font->GetHorizontalAdvance(glyph, *paint);
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return 256 * advance + 0.5;
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}
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static hb_bool_t harfbuzzGetGlyphHorizontalOrigin(hb_font_t* /* hbFont */, void* /* fontData */,
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hb_codepoint_t /* glyph */, hb_position_t* /* x */, hb_position_t* /* y */,
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void* /* userData */) {
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// Just return true, following the way that Harfbuzz-FreeType
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// implementation does.
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return true;
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}
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hb_font_funcs_t* getHbFontFuncs() {
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static hb_font_funcs_t* hbFontFuncs = 0;
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if (hbFontFuncs == 0) {
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hbFontFuncs = hb_font_funcs_create();
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hb_font_funcs_set_glyph_h_advance_func(hbFontFuncs, harfbuzzGetGlyphHorizontalAdvance, 0, 0);
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hb_font_funcs_set_glyph_h_origin_func(hbFontFuncs, harfbuzzGetGlyphHorizontalOrigin, 0, 0);
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hb_font_funcs_make_immutable(hbFontFuncs);
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}
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return hbFontFuncs;
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}
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static float HBFixedToFloat(hb_position_t v)
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{
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return scalbnf (v, -8);
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}
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static hb_position_t HBFloatToFixed(float v)
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{
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return scalbnf (v, +8);
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}
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void Layout::dump() const {
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for (size_t i = 0; i < mGlyphs.size(); i++) {
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const LayoutGlyph& glyph = mGlyphs[i];
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std::cout << glyph.glyph_id << ": " << glyph.x << ", " << glyph.y << std::endl;
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}
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}
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int Layout::findFace(FakedFont face, LayoutContext* ctx) {
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unsigned int ix;
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for (ix = 0; ix < mFaces.size(); ix++) {
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if (mFaces[ix].font == face.font) {
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return ix;
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}
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}
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mFaces.push_back(face);
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// Note: ctx == NULL means we're copying from the cache, no need to create
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// corresponding hb_font object.
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if (ctx != NULL) {
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hb_font_t* font = getHbFontLocked(face.font);
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hb_font_set_funcs(font, getHbFontFuncs(), &ctx->paint, 0);
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ctx->hbFonts.push_back(font);
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}
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return ix;
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}
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static hb_script_t codePointToScript(hb_codepoint_t codepoint) {
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static hb_unicode_funcs_t* u = 0;
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if (!u) {
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u = LayoutEngine::getInstance().unicodeFunctions;
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}
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return hb_unicode_script(u, codepoint);
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}
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static hb_codepoint_t decodeUtf16(const uint16_t* chars, size_t len, ssize_t* iter) {
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const uint16_t v = chars[(*iter)++];
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// test whether v in (0xd800..0xdfff), lead or trail surrogate
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if ((v & 0xf800) == 0xd800) {
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// test whether v in (0xd800..0xdbff), lead surrogate
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if (size_t(*iter) < len && (v & 0xfc00) == 0xd800) {
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const uint16_t v2 = chars[(*iter)++];
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// test whether v2 in (0xdc00..0xdfff), trail surrogate
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if ((v2 & 0xfc00) == 0xdc00) {
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// (0xd800 0xdc00) in utf-16 maps to 0x10000 in ucs-32
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const hb_codepoint_t delta = (0xd800 << 10) + 0xdc00 - 0x10000;
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return (((hb_codepoint_t)v) << 10) + v2 - delta;
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}
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(*iter) -= 1;
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return 0xFFFDu;
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} else {
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return 0xFFFDu;
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}
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} else {
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return v;
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}
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}
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static hb_script_t getScriptRun(const uint16_t* chars, size_t len, ssize_t* iter) {
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if (size_t(*iter) == len) {
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return HB_SCRIPT_UNKNOWN;
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}
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uint32_t cp = decodeUtf16(chars, len, iter);
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hb_script_t current_script = codePointToScript(cp);
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for (;;) {
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if (size_t(*iter) == len)
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break;
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const ssize_t prev_iter = *iter;
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cp = decodeUtf16(chars, len, iter);
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const hb_script_t script = codePointToScript(cp);
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if (script != current_script) {
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if (current_script == HB_SCRIPT_INHERITED ||
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current_script == HB_SCRIPT_COMMON) {
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current_script = script;
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} else if (script == HB_SCRIPT_INHERITED ||
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script == HB_SCRIPT_COMMON) {
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continue;
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} else {
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*iter = prev_iter;
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break;
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}
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}
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}
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if (current_script == HB_SCRIPT_INHERITED) {
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current_script = HB_SCRIPT_COMMON;
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}
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return current_script;
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}
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/**
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* Disable certain scripts (mostly those with cursive connection) from having letterspacing
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* applied. See https://github.com/behdad/harfbuzz/issues/64 for more details.
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*/
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static bool isScriptOkForLetterspacing(hb_script_t script) {
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return !(
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script == HB_SCRIPT_ARABIC ||
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script == HB_SCRIPT_NKO ||
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script == HB_SCRIPT_PSALTER_PAHLAVI ||
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script == HB_SCRIPT_MANDAIC ||
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script == HB_SCRIPT_MONGOLIAN ||
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script == HB_SCRIPT_PHAGS_PA ||
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script == HB_SCRIPT_DEVANAGARI ||
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script == HB_SCRIPT_BENGALI ||
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script == HB_SCRIPT_GURMUKHI ||
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script == HB_SCRIPT_MODI ||
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script == HB_SCRIPT_SHARADA ||
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script == HB_SCRIPT_SYLOTI_NAGRI ||
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script == HB_SCRIPT_TIRHUTA ||
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script == HB_SCRIPT_OGHAM
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);
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}
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class BidiText {
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public:
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class Iter {
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public:
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struct RunInfo {
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int32_t mRunStart;
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int32_t mRunLength;
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bool mIsRtl;
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};
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Iter(UBiDi* bidi, size_t start, size_t end, size_t runIndex, size_t runCount, bool isRtl);
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bool operator!= (const Iter& other) const {
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return mIsEnd != other.mIsEnd || mNextRunIndex != other.mNextRunIndex
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|| mBidi != other.mBidi;
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}
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const RunInfo& operator* () const {
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return mRunInfo;
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}
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const Iter& operator++ () {
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updateRunInfo();
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return *this;
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}
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private:
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UBiDi* const mBidi;
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bool mIsEnd;
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size_t mNextRunIndex;
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const size_t mRunCount;
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const int32_t mStart;
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const int32_t mEnd;
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RunInfo mRunInfo;
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void updateRunInfo();
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};
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BidiText(const uint16_t* buf, size_t start, size_t count, size_t bufSize, int bidiFlags);
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~BidiText() {
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if (mBidi) {
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ubidi_close(mBidi);
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}
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}
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Iter begin () const {
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return Iter(mBidi, mStart, mEnd, 0, mRunCount, mIsRtl);
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}
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Iter end() const {
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return Iter(mBidi, mStart, mEnd, mRunCount, mRunCount, mIsRtl);
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}
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private:
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const size_t mStart;
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const size_t mEnd;
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const size_t mBufSize;
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UBiDi* mBidi;
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size_t mRunCount;
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bool mIsRtl;
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BidiText(const BidiText&) = delete;
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void operator=(const BidiText&) = delete;
|
|
};
|
|
|
|
BidiText::Iter::Iter(UBiDi* bidi, size_t start, size_t end, size_t runIndex, size_t runCount,
|
|
bool isRtl)
|
|
: mBidi(bidi), mIsEnd(runIndex == runCount), mNextRunIndex(runIndex), mRunCount(runCount),
|
|
mStart(start), mEnd(end), mRunInfo() {
|
|
if (mRunCount == 1) {
|
|
mRunInfo.mRunStart = start;
|
|
mRunInfo.mRunLength = end - start;
|
|
mRunInfo.mIsRtl = isRtl;
|
|
mNextRunIndex = mRunCount;
|
|
return;
|
|
}
|
|
updateRunInfo();
|
|
}
|
|
|
|
void BidiText::Iter::updateRunInfo() {
|
|
if (mNextRunIndex == mRunCount) {
|
|
// All runs have been iterated.
|
|
mIsEnd = true;
|
|
return;
|
|
}
|
|
int32_t startRun = -1;
|
|
int32_t lengthRun = -1;
|
|
const UBiDiDirection runDir = ubidi_getVisualRun(mBidi, mNextRunIndex, &startRun, &lengthRun);
|
|
mNextRunIndex++;
|
|
if (startRun == -1 || lengthRun == -1) {
|
|
ALOGE("invalid visual run");
|
|
// skip the invalid run.
|
|
updateRunInfo();
|
|
return;
|
|
}
|
|
const int32_t runEnd = std::min(startRun + lengthRun, mEnd);
|
|
mRunInfo.mRunStart = std::max(startRun, mStart);
|
|
mRunInfo.mRunLength = runEnd - mRunInfo.mRunStart;
|
|
if (mRunInfo.mRunLength <= 0) {
|
|
// skip the empty run.
|
|
updateRunInfo();
|
|
return;
|
|
}
|
|
mRunInfo.mIsRtl = (runDir == UBIDI_RTL);
|
|
}
|
|
|
|
BidiText::BidiText(const uint16_t* buf, size_t start, size_t count, size_t bufSize, int bidiFlags)
|
|
: mStart(start), mEnd(start + count), mBufSize(bufSize), mBidi(NULL), mRunCount(1),
|
|
mIsRtl((bidiFlags & kDirection_Mask) != 0) {
|
|
if (bidiFlags == kBidi_Force_LTR || bidiFlags == kBidi_Force_RTL) {
|
|
// force single run.
|
|
return;
|
|
}
|
|
mBidi = ubidi_open();
|
|
if (!mBidi) {
|
|
ALOGE("error creating bidi object");
|
|
return;
|
|
}
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UBiDiLevel bidiReq = bidiFlags;
|
|
if (bidiFlags == kBidi_Default_LTR) {
|
|
bidiReq = UBIDI_DEFAULT_LTR;
|
|
} else if (bidiFlags == kBidi_Default_RTL) {
|
|
bidiReq = UBIDI_DEFAULT_RTL;
|
|
}
|
|
ubidi_setPara(mBidi, buf, mBufSize, bidiReq, NULL, &status);
|
|
if (!U_SUCCESS(status)) {
|
|
ALOGE("error calling ubidi_setPara, status = %d", status);
|
|
return;
|
|
}
|
|
const int paraDir = ubidi_getParaLevel(mBidi) & kDirection_Mask;
|
|
const ssize_t rc = ubidi_countRuns(mBidi, &status);
|
|
if (!U_SUCCESS(status) || rc < 0) {
|
|
ALOGW("error counting bidi runs, status = %d", status);
|
|
}
|
|
if (!U_SUCCESS(status) || rc <= 1) {
|
|
mIsRtl = (paraDir == kBidi_RTL);
|
|
return;
|
|
}
|
|
mRunCount = rc;
|
|
}
|
|
|
|
void Layout::doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
int bidiFlags, const FontStyle &style, const MinikinPaint &paint) {
|
|
AutoMutex _l(gMinikinLock);
|
|
|
|
LayoutContext ctx;
|
|
ctx.style = style;
|
|
ctx.paint = paint;
|
|
|
|
reset();
|
|
mAdvances.resize(count, 0);
|
|
|
|
for (const BidiText::Iter::RunInfo& runInfo : BidiText(buf, start, count, bufSize, bidiFlags)) {
|
|
doLayoutRunCached(buf, runInfo.mRunStart, runInfo.mRunLength, bufSize, runInfo.mIsRtl, &ctx,
|
|
start, mCollection, this, NULL);
|
|
}
|
|
ctx.clearHbFonts();
|
|
}
|
|
|
|
float Layout::measureText(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
int bidiFlags, const FontStyle &style, const MinikinPaint &paint,
|
|
const FontCollection* collection, float* advances) {
|
|
AutoMutex _l(gMinikinLock);
|
|
|
|
LayoutContext ctx;
|
|
ctx.style = style;
|
|
ctx.paint = paint;
|
|
|
|
float advance = 0;
|
|
for (const BidiText::Iter::RunInfo& runInfo : BidiText(buf, start, count, bufSize, bidiFlags)) {
|
|
float* advancesForRun = advances ? advances + (runInfo.mRunStart - start) : advances;
|
|
advance += doLayoutRunCached(buf, runInfo.mRunStart, runInfo.mRunLength, bufSize,
|
|
runInfo.mIsRtl, &ctx, 0, collection, NULL, advancesForRun);
|
|
}
|
|
|
|
ctx.clearHbFonts();
|
|
return advance;
|
|
}
|
|
|
|
float Layout::doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
bool isRtl, LayoutContext* ctx, size_t dstStart, const FontCollection* collection,
|
|
Layout* layout, float* advances) {
|
|
HyphenEdit hyphen = ctx->paint.hyphenEdit;
|
|
float advance = 0;
|
|
if (!isRtl) {
|
|
// left to right
|
|
size_t wordstart =
|
|
start == bufSize ? start : getPrevWordBreakForCache(buf, start + 1, bufSize);
|
|
size_t wordend;
|
|
for (size_t iter = start; iter < start + count; iter = wordend) {
|
|
wordend = getNextWordBreakForCache(buf, iter, bufSize);
|
|
// Only apply hyphen to the last word in the string.
|
|
ctx->paint.hyphenEdit = wordend >= start + count ? hyphen : HyphenEdit();
|
|
size_t wordcount = std::min(start + count, wordend) - iter;
|
|
advance += doLayoutWord(buf + wordstart, iter - wordstart, wordcount,
|
|
wordend - wordstart, isRtl, ctx, iter - dstStart, collection, layout,
|
|
advances ? advances + (iter - start) : advances);
|
|
wordstart = wordend;
|
|
}
|
|
} else {
|
|
// right to left
|
|
size_t wordstart;
|
|
size_t end = start + count;
|
|
size_t wordend = end == 0 ? 0 : getNextWordBreakForCache(buf, end - 1, bufSize);
|
|
for (size_t iter = end; iter > start; iter = wordstart) {
|
|
wordstart = getPrevWordBreakForCache(buf, iter, bufSize);
|
|
// Only apply hyphen to the last (leftmost) word in the string.
|
|
ctx->paint.hyphenEdit = iter == end ? hyphen : HyphenEdit();
|
|
size_t bufStart = std::max(start, wordstart);
|
|
advance += doLayoutWord(buf + wordstart, bufStart - wordstart, iter - bufStart,
|
|
wordend - wordstart, isRtl, ctx, bufStart - dstStart, collection, layout,
|
|
advances ? advances + (bufStart - start) : advances);
|
|
wordend = wordstart;
|
|
}
|
|
}
|
|
return advance;
|
|
}
|
|
|
|
float Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
bool isRtl, LayoutContext* ctx, size_t bufStart, const FontCollection* collection,
|
|
Layout* layout, float* advances) {
|
|
LayoutCache& cache = LayoutEngine::getInstance().layoutCache;
|
|
LayoutCacheKey key(collection, ctx->paint, ctx->style, buf, start, count, bufSize, isRtl);
|
|
bool skipCache = ctx->paint.skipCache();
|
|
if (skipCache) {
|
|
Layout layoutForWord;
|
|
key.doLayout(&layoutForWord, ctx, collection);
|
|
if (layout) {
|
|
layout->appendLayout(&layoutForWord, bufStart);
|
|
}
|
|
if (advances) {
|
|
layoutForWord.getAdvances(advances);
|
|
}
|
|
return layoutForWord.getAdvance();
|
|
} else {
|
|
Layout* layoutForWord = cache.get(key, ctx, collection);
|
|
if (layout) {
|
|
layout->appendLayout(layoutForWord, bufStart);
|
|
}
|
|
if (advances) {
|
|
layoutForWord->getAdvances(advances);
|
|
}
|
|
return layoutForWord->getAdvance();
|
|
}
|
|
}
|
|
|
|
static void addFeatures(const string &str, vector<hb_feature_t>* features) {
|
|
if (!str.size())
|
|
return;
|
|
|
|
const char* start = str.c_str();
|
|
const char* end = start + str.size();
|
|
|
|
while (start < end) {
|
|
static hb_feature_t feature;
|
|
const char* p = strchr(start, ',');
|
|
if (!p)
|
|
p = end;
|
|
/* We do not allow setting features on ranges. As such, reject any
|
|
* setting that has non-universal range. */
|
|
if (hb_feature_from_string (start, p - start, &feature)
|
|
&& feature.start == 0 && feature.end == (unsigned int) -1)
|
|
features->push_back(feature);
|
|
start = p + 1;
|
|
}
|
|
}
|
|
|
|
void Layout::doLayoutRun(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
bool isRtl, LayoutContext* ctx) {
|
|
hb_buffer_t* buffer = LayoutEngine::getInstance().hbBuffer;
|
|
vector<FontCollection::Run> items;
|
|
mCollection->itemize(buf + start, count, ctx->style, &items);
|
|
if (isRtl) {
|
|
std::reverse(items.begin(), items.end());
|
|
}
|
|
|
|
vector<hb_feature_t> features;
|
|
// Disable default-on non-required ligature features if letter-spacing
|
|
// See http://dev.w3.org/csswg/css-text-3/#letter-spacing-property
|
|
// "When the effective spacing between two characters is not zero (due to
|
|
// either justification or a non-zero value of letter-spacing), user agents
|
|
// should not apply optional ligatures."
|
|
if (fabs(ctx->paint.letterSpacing) > 0.03)
|
|
{
|
|
static const hb_feature_t no_liga = { HB_TAG('l', 'i', 'g', 'a'), 0, 0, ~0u };
|
|
static const hb_feature_t no_clig = { HB_TAG('c', 'l', 'i', 'g'), 0, 0, ~0u };
|
|
features.push_back(no_liga);
|
|
features.push_back(no_clig);
|
|
}
|
|
addFeatures(ctx->paint.fontFeatureSettings, &features);
|
|
|
|
double size = ctx->paint.size;
|
|
double scaleX = ctx->paint.scaleX;
|
|
|
|
float x = mAdvance;
|
|
float y = 0;
|
|
for (size_t run_ix = 0; run_ix < items.size(); run_ix++) {
|
|
FontCollection::Run &run = items[run_ix];
|
|
if (run.fakedFont.font == NULL) {
|
|
ALOGE("no font for run starting u+%04x length %d", buf[run.start], run.end - run.start);
|
|
continue;
|
|
}
|
|
int font_ix = findFace(run.fakedFont, ctx);
|
|
ctx->paint.font = mFaces[font_ix].font;
|
|
ctx->paint.fakery = mFaces[font_ix].fakery;
|
|
hb_font_t* hbFont = ctx->hbFonts[font_ix];
|
|
#ifdef VERBOSE_DEBUG
|
|
ALOGD("Run %zu, font %d [%d:%d]", run_ix, font_ix, run.start, run.end);
|
|
#endif
|
|
|
|
hb_font_set_ppem(hbFont, size * scaleX, size);
|
|
hb_font_set_scale(hbFont, HBFloatToFixed(size * scaleX), HBFloatToFixed(size));
|
|
|
|
// TODO: if there are multiple scripts within a font in an RTL run,
|
|
// we need to reorder those runs. This is unlikely with our current
|
|
// font stack, but should be done for correctness.
|
|
ssize_t srunend;
|
|
for (ssize_t srunstart = run.start; srunstart < run.end; srunstart = srunend) {
|
|
srunend = srunstart;
|
|
hb_script_t script = getScriptRun(buf + start, run.end, &srunend);
|
|
|
|
double letterSpace = 0.0;
|
|
double letterSpaceHalfLeft = 0.0;
|
|
double letterSpaceHalfRight = 0.0;
|
|
|
|
if (ctx->paint.letterSpacing != 0.0 && isScriptOkForLetterspacing(script)) {
|
|
letterSpace = ctx->paint.letterSpacing * size * scaleX;
|
|
if ((ctx->paint.paintFlags & LinearTextFlag) == 0) {
|
|
letterSpace = round(letterSpace);
|
|
letterSpaceHalfLeft = floor(letterSpace * 0.5);
|
|
} else {
|
|
letterSpaceHalfLeft = letterSpace * 0.5;
|
|
}
|
|
letterSpaceHalfRight = letterSpace - letterSpaceHalfLeft;
|
|
}
|
|
|
|
hb_buffer_clear_contents(buffer);
|
|
hb_buffer_set_script(buffer, script);
|
|
hb_buffer_set_direction(buffer, isRtl? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
|
|
const FontLanguages& langList =
|
|
FontLanguageListCache::getById(ctx->style.getLanguageListId());
|
|
if (langList.size() != 0) {
|
|
const FontLanguage* hbLanguage = &langList[0];
|
|
for (size_t i = 0; i < langList.size(); ++i) {
|
|
if (langList[i].supportsHbScript(script)) {
|
|
hbLanguage = &langList[i];
|
|
break;
|
|
}
|
|
}
|
|
hb_buffer_set_language(buffer,
|
|
hb_language_from_string(hbLanguage->getString().c_str(), -1));
|
|
}
|
|
hb_buffer_add_utf16(buffer, buf, bufSize, srunstart + start, srunend - srunstart);
|
|
if (ctx->paint.hyphenEdit.hasHyphen() && srunend > srunstart) {
|
|
// TODO: check whether this is really the desired semantics. It could have the
|
|
// effect of assigning the hyphen width to a nonspacing mark
|
|
unsigned int lastCluster = start + srunend - 1;
|
|
|
|
hb_codepoint_t hyphenChar = 0x2010; // HYPHEN
|
|
hb_codepoint_t glyph;
|
|
// Fallback to ASCII HYPHEN-MINUS if the font didn't have a glyph for HYPHEN. Note
|
|
// that we intentionally don't do anything special if the font doesn't have a
|
|
// HYPHEN-MINUS either, so a tofu could be shown, hinting towards something
|
|
// missing.
|
|
if (!hb_font_get_glyph(hbFont, hyphenChar, 0, &glyph)) {
|
|
hyphenChar = 0x002D; // HYPHEN-MINUS
|
|
}
|
|
hb_buffer_add(buffer, hyphenChar, lastCluster);
|
|
}
|
|
hb_shape(hbFont, buffer, features.empty() ? NULL : &features[0], features.size());
|
|
unsigned int numGlyphs;
|
|
hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, &numGlyphs);
|
|
hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, NULL);
|
|
if (numGlyphs)
|
|
{
|
|
mAdvances[info[0].cluster - start] += letterSpaceHalfLeft;
|
|
x += letterSpaceHalfLeft;
|
|
}
|
|
for (unsigned int i = 0; i < numGlyphs; i++) {
|
|
#ifdef VERBOSE_DEBUG
|
|
ALOGD("%d %d %d %d",
|
|
positions[i].x_advance, positions[i].y_advance,
|
|
positions[i].x_offset, positions[i].y_offset);
|
|
ALOGD("DoLayout %u: %f; %d, %d",
|
|
info[i].codepoint, HBFixedToFloat(positions[i].x_advance),
|
|
positions[i].x_offset, positions[i].y_offset);
|
|
#endif
|
|
if (i > 0 && info[i - 1].cluster != info[i].cluster) {
|
|
mAdvances[info[i - 1].cluster - start] += letterSpaceHalfRight;
|
|
mAdvances[info[i].cluster - start] += letterSpaceHalfLeft;
|
|
x += letterSpace;
|
|
}
|
|
|
|
hb_codepoint_t glyph_ix = info[i].codepoint;
|
|
float xoff = HBFixedToFloat(positions[i].x_offset);
|
|
float yoff = -HBFixedToFloat(positions[i].y_offset);
|
|
xoff += yoff * ctx->paint.skewX;
|
|
LayoutGlyph glyph = {font_ix, glyph_ix, x + xoff, y + yoff};
|
|
mGlyphs.push_back(glyph);
|
|
float xAdvance = HBFixedToFloat(positions[i].x_advance);
|
|
if ((ctx->paint.paintFlags & LinearTextFlag) == 0) {
|
|
xAdvance = roundf(xAdvance);
|
|
}
|
|
MinikinRect glyphBounds;
|
|
ctx->paint.font->GetBounds(&glyphBounds, glyph_ix, ctx->paint);
|
|
glyphBounds.offset(x + xoff, y + yoff);
|
|
mBounds.join(glyphBounds);
|
|
if (info[i].cluster - start < count) {
|
|
mAdvances[info[i].cluster - start] += xAdvance;
|
|
} else {
|
|
ALOGE("cluster %zu (start %zu) out of bounds of count %zu",
|
|
info[i].cluster - start, start, count);
|
|
}
|
|
x += xAdvance;
|
|
}
|
|
if (numGlyphs)
|
|
{
|
|
mAdvances[info[numGlyphs - 1].cluster - start] += letterSpaceHalfRight;
|
|
x += letterSpaceHalfRight;
|
|
}
|
|
}
|
|
}
|
|
mAdvance = x;
|
|
}
|
|
|
|
void Layout::appendLayout(Layout* src, size_t start) {
|
|
int fontMapStack[16];
|
|
int* fontMap;
|
|
if (src->mFaces.size() < sizeof(fontMapStack) / sizeof(fontMapStack[0])) {
|
|
fontMap = fontMapStack;
|
|
} else {
|
|
fontMap = new int[src->mFaces.size()];
|
|
}
|
|
for (size_t i = 0; i < src->mFaces.size(); i++) {
|
|
int font_ix = findFace(src->mFaces[i], NULL);
|
|
fontMap[i] = font_ix;
|
|
}
|
|
int x0 = mAdvance;
|
|
for (size_t i = 0; i < src->mGlyphs.size(); i++) {
|
|
LayoutGlyph& srcGlyph = src->mGlyphs[i];
|
|
int font_ix = fontMap[srcGlyph.font_ix];
|
|
unsigned int glyph_id = srcGlyph.glyph_id;
|
|
float x = x0 + srcGlyph.x;
|
|
float y = srcGlyph.y;
|
|
LayoutGlyph glyph = {font_ix, glyph_id, x, y};
|
|
mGlyphs.push_back(glyph);
|
|
}
|
|
for (size_t i = 0; i < src->mAdvances.size(); i++) {
|
|
mAdvances[i + start] = src->mAdvances[i];
|
|
}
|
|
MinikinRect srcBounds(src->mBounds);
|
|
srcBounds.offset(x0, 0);
|
|
mBounds.join(srcBounds);
|
|
mAdvance += src->mAdvance;
|
|
|
|
if (fontMap != fontMapStack) {
|
|
delete[] fontMap;
|
|
}
|
|
}
|
|
|
|
void Layout::draw(minikin::Bitmap* surface, int x0, int y0, float size) const {
|
|
/*
|
|
TODO: redo as MinikinPaint settings
|
|
if (mProps.hasTag(minikinHinting)) {
|
|
int hintflags = mProps.value(minikinHinting).getIntValue();
|
|
if (hintflags & 1) load_flags |= FT_LOAD_NO_HINTING;
|
|
if (hintflags & 2) load_flags |= FT_LOAD_NO_AUTOHINT;
|
|
}
|
|
*/
|
|
for (size_t i = 0; i < mGlyphs.size(); i++) {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
MinikinFont* mf = mFaces[glyph.font_ix].font;
|
|
MinikinFontFreeType* face = static_cast<MinikinFontFreeType*>(mf);
|
|
GlyphBitmap glyphBitmap;
|
|
MinikinPaint paint;
|
|
paint.size = size;
|
|
bool ok = face->Render(glyph.glyph_id, paint, &glyphBitmap);
|
|
#ifdef VERBOSE_DEBUG
|
|
ALOGD("glyphBitmap.width=%d, glyphBitmap.height=%d (%d, %d) x=%f, y=%f, ok=%d",
|
|
glyphBitmap.width, glyphBitmap.height, glyphBitmap.left, glyphBitmap.top, glyph.x, glyph.y, ok);
|
|
#endif
|
|
if (ok) {
|
|
surface->drawGlyph(glyphBitmap,
|
|
x0 + int(floor(glyph.x + 0.5)), y0 + int(floor(glyph.y + 0.5)));
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t Layout::nGlyphs() const {
|
|
return mGlyphs.size();
|
|
}
|
|
|
|
MinikinFont* Layout::getFont(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
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return mFaces[glyph.font_ix].font;
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}
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FontFakery Layout::getFakery(int i) const {
|
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const LayoutGlyph& glyph = mGlyphs[i];
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return mFaces[glyph.font_ix].fakery;
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|
}
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|
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unsigned int Layout::getGlyphId(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.glyph_id;
|
|
}
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|
|
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float Layout::getX(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.x;
|
|
}
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|
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float Layout::getY(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.y;
|
|
}
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|
|
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float Layout::getAdvance() const {
|
|
return mAdvance;
|
|
}
|
|
|
|
void Layout::getAdvances(float* advances) {
|
|
memcpy(advances, &mAdvances[0], mAdvances.size() * sizeof(float));
|
|
}
|
|
|
|
void Layout::getBounds(MinikinRect* bounds) {
|
|
bounds->set(mBounds);
|
|
}
|
|
|
|
void Layout::purgeCaches() {
|
|
AutoMutex _l(gMinikinLock);
|
|
LayoutCache& layoutCache = LayoutEngine::getInstance().layoutCache;
|
|
layoutCache.clear();
|
|
purgeHbFontCacheLocked();
|
|
}
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|
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} // namespace android
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