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https://github.com/flutter/flutter.git
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05d59ee462
Proper Japanese layout requires sophisticated rules for spacing punctuation, not just turning on the "palt" (proportional alternate) feature. Until we can support the whole set, roll back palt. Change-Id: If2359c529b70b1dd45dddc00e5f4aa1c91f8b0e9
817 lines
28 KiB
C++
817 lines
28 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 <cutils/log.h>
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#include <string>
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#include <vector>
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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 <stdio.h> // ditto
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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 <unicode/ubidi.h>
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#include <hb-icu.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 android {
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// TODO: these should move into the header file, but for now we don't want
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// to cause namespace collisions with TextLayout.h
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enum {
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kBidi_LTR = 0,
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kBidi_RTL = 1,
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kBidi_Default_LTR = 2,
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kBidi_Default_RTL = 3,
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kBidi_Force_LTR = 4,
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kBidi_Force_RTL = 5,
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kBidi_Mask = 0x7
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};
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const int kDirection_Mask = 0x1;
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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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: 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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mPaintFlags(paint.paintFlags), mIsRtl(dir) {
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mText.setTo(chars, nchars);
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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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// This is present to avoid having to copy the text more than once.
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const uint16_t* textBuf() { return mText.string(); }
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private:
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String16 mText;
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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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int32_t mPaintFlags;
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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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};
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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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// callback for OnEntryRemoved
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void operator()(LayoutCacheKey& key, Layout*& value) {
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delete value;
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}
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LruCache<LayoutCacheKey, Layout*> mCache;
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private:
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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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class HbFaceCache : private OnEntryRemoved<int32_t, hb_face_t*> {
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public:
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HbFaceCache() : mCache(kMaxEntries) {
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mCache.setOnEntryRemovedListener(this);
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}
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// callback for OnEntryRemoved
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void operator()(int32_t& key, hb_face_t*& value) {
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hb_face_destroy(value);
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}
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LruCache<int32_t, hb_face_t*> mCache;
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private:
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static const size_t kMaxEntries = 100;
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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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hbBuffer = hb_buffer_create();
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}
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hb_buffer_t* hbBuffer;
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LayoutCache layoutCache;
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HbFaceCache hbFaceCache;
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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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&& mPaintFlags == other.mPaintFlags
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&& mIsRtl == other.mIsRtl
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&& mText == other.mText;
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}
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hash_t LayoutCacheKey::hash() 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(mPaintFlags));
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hash = JenkinsHashMix(hash, hash_type(mIsRtl));
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hash = JenkinsHashMixShorts(hash, mText.string(), mText.size());
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return JenkinsHashWhiten(hash);
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}
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struct LayoutContext {
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MinikinPaint paint;
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FontStyle style;
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CssProperties props;
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std::vector<hb_font_t*> hbFonts; // parallel to mFaces
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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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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 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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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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// TODO: the actual initialization is deferred, maybe make this explicit
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void Layout::init() {
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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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hb_blob_t* referenceTable(hb_face_t* face, hb_tag_t tag, void* userData) {
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MinikinFont* font = reinterpret_cast<MinikinFont*>(userData);
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size_t length = 0;
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bool ok = font->GetTable(tag, NULL, &length);
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if (!ok) {
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return 0;
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}
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char* buffer = reinterpret_cast<char*>(malloc(length));
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if (!buffer) {
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return 0;
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}
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ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length);
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printf("referenceTable %c%c%c%c length=%d %d\n",
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(tag >>24) & 0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok);
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if (!ok) {
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free(buffer);
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return 0;
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}
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return hb_blob_create(const_cast<char*>(buffer), length,
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HB_MEMORY_MODE_WRITABLE, buffer, free);
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}
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static hb_bool_t harfbuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData)
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{
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MinikinPaint* paint = reinterpret_cast<MinikinPaint*>(fontData);
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MinikinFont* font = paint->font;
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uint32_t glyph_id;
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bool ok = font->GetGlyph(unicode, &glyph_id);
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if (ok) {
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*glyph = glyph_id;
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}
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return ok;
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}
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static hb_position_t harfbuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData)
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{
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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, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData)
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{
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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_func(hbFontFuncs, harfbuzzGetGlyph, 0, 0);
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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 hb_face_t* getHbFace(MinikinFont* minikinFont) {
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HbFaceCache& cache = LayoutEngine::getInstance().hbFaceCache;
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int32_t fontId = minikinFont->GetUniqueId();
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hb_face_t* face = cache.mCache.get(fontId);
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if (face == NULL) {
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face = hb_face_create_for_tables(referenceTable, minikinFont, NULL);
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cache.mCache.put(fontId, face);
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}
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return face;
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}
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static hb_font_t* create_hb_font(MinikinFont* minikinFont, MinikinPaint* minikinPaint) {
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hb_face_t* face = getHbFace(minikinFont);
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hb_font_t* font = hb_font_create(face);
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hb_font_set_funcs(font, getHbFontFuncs(), minikinPaint, 0);
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return font;
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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 = create_hb_font(face.font, &ctx->paint);
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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 FontStyle styleFromCss(const CssProperties &props) {
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int weight = 4;
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if (props.hasTag(fontWeight)) {
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weight = props.value(fontWeight).getIntValue() / 100;
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}
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bool italic = false;
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if (props.hasTag(fontStyle)) {
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italic = props.value(fontStyle).getIntValue() != 0;
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}
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FontLanguage lang;
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if (props.hasTag(cssLang)) {
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string langStr = props.value(cssLang).getStringValue();
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lang = FontLanguage(langStr.c_str(), langStr.size());
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}
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int variant = 0;
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if (props.hasTag(minikinVariant)) {
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variant = props.value(minikinVariant).getIntValue();
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}
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return FontStyle(lang, variant, weight, italic);
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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 = hb_icu_get_unicode_funcs();
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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) -= 2;
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return ~0u;
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} else {
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(*iter)--;
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return ~0u;
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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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* For the purpose of layout, a word break is a boundary with no
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* kerning or complex script processing. This is necessarily a
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* heuristic, but should be accurate most of the time.
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*/
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static bool isWordBreak(int c) {
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if (c == ' ' || (c >= 0x2000 && c <= 0x200a) || c == 0x3000) {
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// spaces
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return true;
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}
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if ((c >= 0x3400 && c <= 0x9fff)) {
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// CJK ideographs (and yijing hexagram symbols)
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return true;
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}
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// Note: kana is not included, as sophisticated fonts may kern kana
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return false;
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}
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/**
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* Return offset of previous word break. It is either < offset or == 0.
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*/
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static size_t getPrevWordBreak(const uint16_t* chars, size_t offset) {
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if (offset == 0) return 0;
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if (isWordBreak(chars[offset - 1])) {
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return offset - 1;
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}
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for (size_t i = offset - 1; i > 0; i--) {
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if (isWordBreak(chars[i - 1])) {
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return i;
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}
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}
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return 0;
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}
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/**
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* Return offset of next word break. It is either > offset or == len.
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*/
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static size_t getNextWordBreak(const uint16_t* chars, size_t offset, size_t len) {
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if (offset >= len) return len;
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if (isWordBreak(chars[offset])) {
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return offset + 1;
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}
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for (size_t i = offset + 1; i < len; i++) {
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if (isWordBreak(chars[i])) {
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return i;
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}
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}
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return len;
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}
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// deprecated API, to avoid breaking client
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void Layout::doLayout(const uint16_t* buf, size_t nchars) {
|
|
doLayout(buf, 0, nchars, nchars, mCssString);
|
|
}
|
|
|
|
static void clearHbFonts(LayoutContext* ctx) {
|
|
for (size_t i = 0; i < ctx->hbFonts.size(); i++) {
|
|
hb_font_destroy(ctx->hbFonts[i]);
|
|
}
|
|
ctx->hbFonts.clear();
|
|
}
|
|
|
|
void Layout::doLayout(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
const string& css) {
|
|
AutoMutex _l(gMinikinLock);
|
|
LayoutContext ctx;
|
|
|
|
ctx.props.parse(css);
|
|
ctx.style = styleFromCss(ctx.props);
|
|
|
|
ctx.paint.size = ctx.props.value(fontSize).getDoubleValue();
|
|
ctx.paint.scaleX = ctx.props.hasTag(fontScaleX)
|
|
? ctx.props.value(fontScaleX).getDoubleValue() : 1;
|
|
ctx.paint.skewX = ctx.props.hasTag(fontSkewX)
|
|
? ctx.props.value(fontSkewX).getDoubleValue() : 0;
|
|
ctx.paint.paintFlags = ctx.props.hasTag(paintFlags)
|
|
? ctx.props.value(paintFlags).getUintValue() : 0;
|
|
int bidiFlags = ctx.props.hasTag(minikinBidi) ? ctx.props.value(minikinBidi).getIntValue() : 0;
|
|
bool isRtl = (bidiFlags & kDirection_Mask) != 0;
|
|
bool doSingleRun = true;
|
|
|
|
mGlyphs.clear();
|
|
mFaces.clear();
|
|
mBounds.setEmpty();
|
|
mAdvances.clear();
|
|
mAdvances.resize(count, 0);
|
|
mAdvance = 0;
|
|
if (!(bidiFlags == kBidi_Force_LTR || bidiFlags == kBidi_Force_RTL)) {
|
|
UBiDi* bidi = ubidi_open();
|
|
if (bidi) {
|
|
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(bidi, buf, bufSize, bidiReq, NULL, &status);
|
|
if (U_SUCCESS(status)) {
|
|
int paraDir = ubidi_getParaLevel(bidi) & kDirection_Mask;
|
|
ssize_t rc = ubidi_countRuns(bidi, &status);
|
|
if (!U_SUCCESS(status) || rc < 0) {
|
|
ALOGW("error counting bidi runs, status = %d", status);
|
|
}
|
|
if (!U_SUCCESS(status) || rc <= 1) {
|
|
isRtl = (paraDir == kBidi_RTL);
|
|
} else {
|
|
doSingleRun = false;
|
|
// iterate through runs
|
|
for (ssize_t i = 0; i < (ssize_t)rc; i++) {
|
|
int32_t startRun = -1;
|
|
int32_t lengthRun = -1;
|
|
UBiDiDirection runDir = ubidi_getVisualRun(bidi, i, &startRun, &lengthRun);
|
|
if (startRun == -1 || lengthRun == -1) {
|
|
ALOGE("invalid visual run");
|
|
// skip the invalid run
|
|
continue;
|
|
}
|
|
int32_t endRun = std::min(startRun + lengthRun, int32_t(start + count));
|
|
startRun = std::max(startRun, int32_t(start));
|
|
lengthRun = endRun - startRun;
|
|
if (lengthRun > 0) {
|
|
isRtl = (runDir == UBIDI_RTL);
|
|
doLayoutRunCached(buf, startRun, lengthRun, bufSize, isRtl, &ctx,
|
|
start);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
ALOGE("error calling ubidi_setPara, status = %d", status);
|
|
}
|
|
ubidi_close(bidi);
|
|
} else {
|
|
ALOGE("error creating bidi object");
|
|
}
|
|
}
|
|
if (doSingleRun) {
|
|
doLayoutRunCached(buf, start, count, bufSize, isRtl, &ctx, start);
|
|
}
|
|
clearHbFonts(&ctx);
|
|
}
|
|
|
|
void Layout::doLayoutRunCached(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
bool isRtl, LayoutContext* ctx, size_t dstStart) {
|
|
if (!isRtl) {
|
|
// left to right
|
|
size_t wordstart = start == bufSize ? start : getPrevWordBreak(buf, start + 1);
|
|
size_t wordend;
|
|
for (size_t iter = start; iter < start + count; iter = wordend) {
|
|
wordend = getNextWordBreak(buf, iter, bufSize);
|
|
size_t wordcount = std::min(start + count, wordend) - iter;
|
|
doLayoutWord(buf + wordstart, iter - wordstart, wordcount, wordend - wordstart,
|
|
isRtl, ctx, iter - dstStart);
|
|
wordstart = wordend;
|
|
}
|
|
} else {
|
|
// right to left
|
|
size_t wordstart;
|
|
size_t end = start + count;
|
|
size_t wordend = end == 0 ? 0 : getNextWordBreak(buf, end - 1, bufSize);
|
|
for (size_t iter = end; iter > start; iter = wordstart) {
|
|
wordstart = getPrevWordBreak(buf, iter);
|
|
size_t bufStart = std::max(start, wordstart);
|
|
doLayoutWord(buf + wordstart, bufStart - wordstart, iter - bufStart,
|
|
wordend - wordstart, isRtl, ctx, bufStart - dstStart);
|
|
wordend = wordstart;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Layout::doLayoutWord(const uint16_t* buf, size_t start, size_t count, size_t bufSize,
|
|
bool isRtl, LayoutContext* ctx, size_t bufStart) {
|
|
LayoutCache& cache = LayoutEngine::getInstance().layoutCache;
|
|
LayoutCacheKey key(mCollection, ctx->paint, ctx->style, buf, start, count, bufSize, isRtl);
|
|
Layout* value = cache.mCache.get(key);
|
|
if (value == NULL) {
|
|
value = new Layout();
|
|
value->setFontCollection(mCollection);
|
|
value->mAdvances.resize(count, 0);
|
|
clearHbFonts(ctx);
|
|
// Note: we do the layout from the copy stored in the key, in case a
|
|
// badly-behaved client is mutating the buffer in a separate thread.
|
|
value->doLayoutRun(key.textBuf(), start, count, bufSize, isRtl, ctx);
|
|
}
|
|
appendLayout(value, bufStart);
|
|
cache.mCache.put(key, value);
|
|
}
|
|
|
|
static void addFeatures(vector<hb_feature_t>* features) {
|
|
// hardcoded features, to be repaced with more flexible configuration
|
|
static hb_feature_t palt = { HB_TAG('p', 'a', 'l', 't'), 1, 0, ~0u };
|
|
|
|
// Don't enable "palt" for now, pending implementation of more of the
|
|
// W3C Japanese layout recommendations. See:
|
|
// http://www.w3.org/TR/2012/NOTE-jlreq-20120403/
|
|
#if 0
|
|
features->push_back(palt);
|
|
#endif
|
|
}
|
|
|
|
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;
|
|
addFeatures(&features);
|
|
|
|
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
|
|
std::cout << "Run " << run_ix << ", font " << font_ix <<
|
|
" [" << run.start << ":" << run.end << "]" << std::endl;
|
|
#endif
|
|
double size = ctx->paint.size;
|
|
double scaleX = ctx->paint.scaleX;
|
|
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);
|
|
|
|
hb_buffer_reset(buffer);
|
|
hb_buffer_set_script(buffer, script);
|
|
hb_buffer_set_direction(buffer, isRtl? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
|
|
if (ctx->props.hasTag(cssLang)) {
|
|
string lang = ctx->props.value(cssLang).getStringValue();
|
|
hb_buffer_set_language(buffer, hb_language_from_string(lang.c_str(), -1));
|
|
}
|
|
hb_buffer_add_utf16(buffer, buf, bufSize, srunstart + start, srunend - srunstart);
|
|
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);
|
|
for (unsigned int i = 0; i < numGlyphs; i++) {
|
|
#ifdef VERBOSE
|
|
std::cout << positions[i].x_advance << " " << positions[i].y_advance << " " << positions[i].x_offset << " " << positions[i].y_offset << std::endl; std::cout << "DoLayout " << info[i].codepoint <<
|
|
": " << HBFixedToFloat(positions[i].x_advance) << "; " << positions[i].x_offset << ", " << positions[i].y_offset << std::endl;
|
|
#endif
|
|
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);
|
|
MinikinRect glyphBounds;
|
|
ctx->paint.font->GetBounds(&glyphBounds, glyph_ix, ctx->paint);
|
|
glyphBounds.offset(x + xoff, y + yoff);
|
|
mBounds.join(glyphBounds);
|
|
size_t cluster = info[i].cluster - start;
|
|
mAdvances[cluster] += xAdvance;
|
|
x += xAdvance;
|
|
}
|
|
}
|
|
}
|
|
mAdvance = x;
|
|
}
|
|
|
|
void Layout::appendLayout(Layout* src, size_t start) {
|
|
// Note: size==1 is by far most common, should have specialized vector for this
|
|
std::vector<int> fontMap;
|
|
for (size_t i = 0; i < src->mFaces.size(); i++) {
|
|
int font_ix = findFace(src->mFaces[i], NULL);
|
|
fontMap.push_back(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;
|
|
}
|
|
|
|
void Layout::draw(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);
|
|
printf("glyphBitmap.width=%d, glyphBitmap.height=%d (%d, %d) x=%f, y=%f, ok=%d\n",
|
|
glyphBitmap.width, glyphBitmap.height, glyphBitmap.left, glyphBitmap.top, glyph.x, glyph.y, ok);
|
|
if (ok) {
|
|
surface->drawGlyph(glyphBitmap,
|
|
x0 + int(floor(glyph.x + 0.5)), y0 + int(floor(glyph.y + 0.5)));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Layout::setProperties(const string& css) {
|
|
mCssString = css;
|
|
}
|
|
|
|
size_t Layout::nGlyphs() const {
|
|
return mGlyphs.size();
|
|
}
|
|
|
|
MinikinFont* Layout::getFont(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return mFaces[glyph.font_ix].font;
|
|
}
|
|
|
|
FontFakery Layout::getFakery(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return mFaces[glyph.font_ix].fakery;
|
|
}
|
|
|
|
unsigned int Layout::getGlyphId(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.glyph_id;
|
|
}
|
|
|
|
float Layout::getX(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.x;
|
|
}
|
|
|
|
float Layout::getY(int i) const {
|
|
const LayoutGlyph& glyph = mGlyphs[i];
|
|
return glyph.y;
|
|
}
|
|
|
|
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.mCache.clear();
|
|
HbFaceCache& hbCache = LayoutEngine::getInstance().hbFaceCache;
|
|
hbCache.mCache.clear();
|
|
}
|
|
|
|
} // namespace android
|