1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "StaticLayout"
18
19#include "ScopedIcuLocale.h"
20#include "unicode/locid.h"
21#include "unicode/brkiter.h"
22#include "utils/misc.h"
23#include "utils/Log.h"
24#include "ScopedStringChars.h"
25#include "ScopedPrimitiveArray.h"
26#include "JNIHelp.h"
27#include "core_jni_helpers.h"
28#include <cstdint>
29#include <vector>
30#include <list>
31#include <algorithm>
32
33#include "SkPaint.h"
34#include "SkTypeface.h"
35#include <hwui/MinikinSkia.h>
36#include <hwui/MinikinUtils.h>
37#include <hwui/Paint.h>
38#include <minikin/FontCollection.h>
39#include <minikin/LineBreaker.h>
40#include <minikin/MinikinFont.h>
41
42namespace android {
43
44struct JLineBreaksID {
45    jfieldID breaks;
46    jfieldID widths;
47    jfieldID flags;
48};
49
50static jclass gLineBreaks_class;
51static JLineBreaksID gLineBreaks_fieldID;
52
53// set text and set a number of parameters for creating a layout (width, tabstops, strategy,
54// hyphenFrequency)
55static void nSetupParagraph(JNIEnv* env, jclass, jlong nativePtr, jcharArray text, jint length,
56        jfloat firstWidth, jint firstWidthLineLimit, jfloat restWidth,
57        jintArray variableTabStops, jint defaultTabStop, jint strategy, jint hyphenFrequency) {
58    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
59    b->resize(length);
60    env->GetCharArrayRegion(text, 0, length, b->buffer());
61    b->setText();
62    b->setLineWidths(firstWidth, firstWidthLineLimit, restWidth);
63    if (variableTabStops == nullptr) {
64        b->setTabStops(nullptr, 0, defaultTabStop);
65    } else {
66        ScopedIntArrayRO stops(env, variableTabStops);
67        b->setTabStops(stops.get(), stops.size(), defaultTabStop);
68    }
69    b->setStrategy(static_cast<BreakStrategy>(strategy));
70    b->setHyphenationFrequency(static_cast<HyphenationFrequency>(hyphenFrequency));
71}
72
73static void recycleCopy(JNIEnv* env, jobject recycle, jintArray recycleBreaks,
74                        jfloatArray recycleWidths, jintArray recycleFlags,
75                        jint recycleLength, size_t nBreaks, const jint* breaks,
76                        const jfloat* widths, const jint* flags) {
77    if ((size_t)recycleLength < nBreaks) {
78        // have to reallocate buffers
79        recycleBreaks = env->NewIntArray(nBreaks);
80        recycleWidths = env->NewFloatArray(nBreaks);
81        recycleFlags = env->NewIntArray(nBreaks);
82
83        env->SetObjectField(recycle, gLineBreaks_fieldID.breaks, recycleBreaks);
84        env->SetObjectField(recycle, gLineBreaks_fieldID.widths, recycleWidths);
85        env->SetObjectField(recycle, gLineBreaks_fieldID.flags, recycleFlags);
86    }
87    // copy data
88    env->SetIntArrayRegion(recycleBreaks, 0, nBreaks, breaks);
89    env->SetFloatArrayRegion(recycleWidths, 0, nBreaks, widths);
90    env->SetIntArrayRegion(recycleFlags, 0, nBreaks, flags);
91}
92
93static jint nComputeLineBreaks(JNIEnv* env, jclass, jlong nativePtr,
94                               jobject recycle, jintArray recycleBreaks,
95                               jfloatArray recycleWidths, jintArray recycleFlags,
96                               jint recycleLength) {
97    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
98
99    size_t nBreaks = b->computeBreaks();
100
101    recycleCopy(env, recycle, recycleBreaks, recycleWidths, recycleFlags, recycleLength,
102            nBreaks, b->getBreaks(), b->getWidths(), b->getFlags());
103
104    b->finish();
105
106    return static_cast<jint>(nBreaks);
107}
108
109static jlong nNewBuilder(JNIEnv*, jclass) {
110    return reinterpret_cast<jlong>(new LineBreaker);
111}
112
113static void nFreeBuilder(JNIEnv*, jclass, jlong nativePtr) {
114    delete reinterpret_cast<LineBreaker*>(nativePtr);
115}
116
117static void nFinishBuilder(JNIEnv*, jclass, jlong nativePtr) {
118    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
119    b->finish();
120}
121
122static jlong nLoadHyphenator(JNIEnv* env, jclass, jobject buffer, jint offset) {
123    const uint8_t* bytebuf = nullptr;
124    if (buffer != nullptr) {
125        void* rawbuf = env->GetDirectBufferAddress(buffer);
126        if (rawbuf != nullptr) {
127            bytebuf = reinterpret_cast<const uint8_t*>(rawbuf) + offset;
128        } else {
129            ALOGE("failed to get direct buffer address");
130        }
131    }
132    Hyphenator* hyphenator = Hyphenator::loadBinary(bytebuf);
133    return reinterpret_cast<jlong>(hyphenator);
134}
135
136static void nSetLocale(JNIEnv* env, jclass, jlong nativePtr, jstring javaLocaleName,
137        jlong nativeHyphenator) {
138    ScopedIcuLocale icuLocale(env, javaLocaleName);
139    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
140    Hyphenator* hyphenator = reinterpret_cast<Hyphenator*>(nativeHyphenator);
141
142    if (icuLocale.valid()) {
143        b->setLocale(icuLocale.locale(), hyphenator);
144    }
145}
146
147static void nSetIndents(JNIEnv* env, jclass, jlong nativePtr, jintArray indents) {
148    ScopedIntArrayRO indentArr(env, indents);
149    std::vector<float> indentVec(indentArr.get(), indentArr.get() + indentArr.size());
150    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
151    b->setIndents(indentVec);
152}
153
154// Basically similar to Paint.getTextRunAdvances but with C++ interface
155static jfloat nAddStyleRun(JNIEnv* env, jclass, jlong nativePtr,
156        jlong nativePaint, jlong nativeTypeface, jint start, jint end, jboolean isRtl) {
157    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
158    Paint* paint = reinterpret_cast<Paint*>(nativePaint);
159    Typeface* typeface = reinterpret_cast<Typeface*>(nativeTypeface);
160    FontCollection *font;
161    MinikinPaint minikinPaint;
162    FontStyle style = MinikinUtils::prepareMinikinPaint(&minikinPaint, &font, paint, typeface);
163    return b->addStyleRun(&minikinPaint, font, style, start, end, isRtl);
164}
165
166// Accept width measurements for the run, passed in from Java
167static void nAddMeasuredRun(JNIEnv* env, jclass, jlong nativePtr,
168        jint start, jint end, jfloatArray widths) {
169    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
170    env->GetFloatArrayRegion(widths, start, end - start, b->charWidths() + start);
171    b->addStyleRun(nullptr, nullptr, FontStyle{}, start, end, false);
172}
173
174static void nAddReplacementRun(JNIEnv* env, jclass, jlong nativePtr,
175        jint start, jint end, jfloat width) {
176    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
177    b->addReplacement(start, end, width);
178}
179
180static void nGetWidths(JNIEnv* env, jclass, jlong nativePtr, jfloatArray widths) {
181    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
182    env->SetFloatArrayRegion(widths, 0, b->size(), b->charWidths());
183}
184
185static const JNINativeMethod gMethods[] = {
186    // TODO performance: many of these are candidates for fast jni, awaiting guidance
187    {"nNewBuilder", "()J", (void*) nNewBuilder},
188    {"nFreeBuilder", "(J)V", (void*) nFreeBuilder},
189    {"nFinishBuilder", "(J)V", (void*) nFinishBuilder},
190    {"nLoadHyphenator", "(Ljava/nio/ByteBuffer;I)J", (void*) nLoadHyphenator},
191    {"nSetLocale", "(JLjava/lang/String;J)V", (void*) nSetLocale},
192    {"nSetupParagraph", "(J[CIFIF[IIII)V", (void*) nSetupParagraph},
193    {"nSetIndents", "(J[I)V", (void*) nSetIndents},
194    {"nAddStyleRun", "(JJJIIZ)F", (void*) nAddStyleRun},
195    {"nAddMeasuredRun", "(JII[F)V", (void*) nAddMeasuredRun},
196    {"nAddReplacementRun", "(JIIF)V", (void*) nAddReplacementRun},
197    {"nGetWidths", "(J[F)V", (void*) nGetWidths},
198    {"nComputeLineBreaks", "(JLandroid/text/StaticLayout$LineBreaks;[I[F[II)I",
199        (void*) nComputeLineBreaks}
200};
201
202int register_android_text_StaticLayout(JNIEnv* env)
203{
204    gLineBreaks_class = MakeGlobalRefOrDie(env,
205            FindClassOrDie(env, "android/text/StaticLayout$LineBreaks"));
206
207    gLineBreaks_fieldID.breaks = GetFieldIDOrDie(env, gLineBreaks_class, "breaks", "[I");
208    gLineBreaks_fieldID.widths = GetFieldIDOrDie(env, gLineBreaks_class, "widths", "[F");
209    gLineBreaks_fieldID.flags = GetFieldIDOrDie(env, gLineBreaks_class, "flags", "[I");
210
211    return RegisterMethodsOrDie(env, "android/text/StaticLayout", gMethods, NELEM(gMethods));
212}
213
214}
215