android_text_StaticLayout.cpp revision f8f9c10247b32c0075f0e0e30c1f38d7a61a030d 
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 "MinikinSkia.h"
36#include "MinikinUtils.h"
37#include "Paint.h"
38#include "minikin/LineBreaker.h"
39
40namespace android {
41
42struct JLineBreaksID {
43    jfieldID breaks;
44    jfieldID widths;
45    jfieldID flags;
46};
47
48static jclass gLineBreaks_class;
49static JLineBreaksID gLineBreaks_fieldID;
50
51// set text and set a number of parameters for creating a layout (width, tabstops, strategy,
52// hyphenFrequency)
53static void nSetupParagraph(JNIEnv* env, jclass, jlong nativePtr, jcharArray text, jint length,
54        jfloat firstWidth, jint firstWidthLineLimit, jfloat restWidth,
55        jintArray variableTabStops, jint defaultTabStop, jint strategy, jint hyphenFrequency) {
56    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
57    b->resize(length);
58    env->GetCharArrayRegion(text, 0, length, b->buffer());
59    b->setText();
60    b->setLineWidths(firstWidth, firstWidthLineLimit, restWidth);
61    if (variableTabStops == nullptr) {
62        b->setTabStops(nullptr, 0, defaultTabStop);
63    } else {
64        ScopedIntArrayRO stops(env, variableTabStops);
65        b->setTabStops(stops.get(), stops.size(), defaultTabStop);
66    }
67    b->setStrategy(static_cast<BreakStrategy>(strategy));
68    b->setHyphenationFrequency(static_cast<HyphenationFrequency>(hyphenFrequency));
69}
70
71static void recycleCopy(JNIEnv* env, jobject recycle, jintArray recycleBreaks,
72                        jfloatArray recycleWidths, jintArray recycleFlags,
73                        jint recycleLength, size_t nBreaks, const jint* breaks,
74                        const jfloat* widths, const jint* flags) {
75    if ((size_t)recycleLength < nBreaks) {
76        // have to reallocate buffers
77        recycleBreaks = env->NewIntArray(nBreaks);
78        recycleWidths = env->NewFloatArray(nBreaks);
79        recycleFlags = env->NewIntArray(nBreaks);
80
81        env->SetObjectField(recycle, gLineBreaks_fieldID.breaks, recycleBreaks);
82        env->SetObjectField(recycle, gLineBreaks_fieldID.widths, recycleWidths);
83        env->SetObjectField(recycle, gLineBreaks_fieldID.flags, recycleFlags);
84    }
85    // copy data
86    env->SetIntArrayRegion(recycleBreaks, 0, nBreaks, breaks);
87    env->SetFloatArrayRegion(recycleWidths, 0, nBreaks, widths);
88    env->SetIntArrayRegion(recycleFlags, 0, nBreaks, flags);
89}
90
91static jint nComputeLineBreaks(JNIEnv* env, jclass, jlong nativePtr,
92                               jobject recycle, jintArray recycleBreaks,
93                               jfloatArray recycleWidths, jintArray recycleFlags,
94                               jint recycleLength) {
95    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
96
97    size_t nBreaks = b->computeBreaks();
98
99    recycleCopy(env, recycle, recycleBreaks, recycleWidths, recycleFlags, recycleLength,
100            nBreaks, b->getBreaks(), b->getWidths(), b->getFlags());
101
102    b->finish();
103
104    return static_cast<jint>(nBreaks);
105}
106
107static jlong nNewBuilder(JNIEnv*, jclass) {
108    return reinterpret_cast<jlong>(new LineBreaker);
109}
110
111static void nFreeBuilder(JNIEnv*, jclass, jlong nativePtr) {
112    delete reinterpret_cast<LineBreaker*>(nativePtr);
113}
114
115static void nFinishBuilder(JNIEnv*, jclass, jlong nativePtr) {
116    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
117    b->finish();
118}
119
120static jlong nLoadHyphenator(JNIEnv* env, jclass, jobject buffer, jint offset) {
121    const uint8_t* bytebuf = nullptr;
122    if (buffer != nullptr) {
123        void* rawbuf = env->GetDirectBufferAddress(buffer);
124        if (rawbuf != nullptr) {
125            bytebuf = reinterpret_cast<const uint8_t*>(rawbuf) + offset;
126        } else {
127            ALOGE("failed to get direct buffer address");
128        }
129    }
130    Hyphenator* hyphenator = Hyphenator::loadBinary(bytebuf);
131    return reinterpret_cast<jlong>(hyphenator);
132}
133
134static void nSetLocale(JNIEnv* env, jclass, jlong nativePtr, jstring javaLocaleName,
135        jlong nativeHyphenator) {
136    ScopedIcuLocale icuLocale(env, javaLocaleName);
137    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
138    Hyphenator* hyphenator = reinterpret_cast<Hyphenator*>(nativeHyphenator);
139
140    if (icuLocale.valid()) {
141        b->setLocale(icuLocale.locale(), hyphenator);
142    }
143}
144
145static void nSetIndents(JNIEnv* env, jclass, jlong nativePtr, jintArray indents) {
146    ScopedIntArrayRO indentArr(env, indents);
147    std::vector<float> indentVec(indentArr.get(), indentArr.get() + indentArr.size());
148    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
149    b->setIndents(indentVec);
150}
151
152// Basically similar to Paint.getTextRunAdvances but with C++ interface
153static jfloat nAddStyleRun(JNIEnv* env, jclass, jlong nativePtr,
154        jlong nativePaint, jlong nativeTypeface, jint start, jint end, jboolean isRtl) {
155    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
156    Paint* paint = reinterpret_cast<Paint*>(nativePaint);
157    TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(nativeTypeface);
158    FontCollection *font;
159    MinikinPaint minikinPaint;
160    FontStyle style = MinikinUtils::prepareMinikinPaint(&minikinPaint, &font, paint, typeface);
161    return b->addStyleRun(&minikinPaint, font, style, start, end, isRtl);
162}
163
164// Accept width measurements for the run, passed in from Java
165static void nAddMeasuredRun(JNIEnv* env, jclass, jlong nativePtr,
166        jint start, jint end, jfloatArray widths) {
167    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
168    env->GetFloatArrayRegion(widths, start, end - start, b->charWidths() + start);
169    b->addStyleRun(nullptr, nullptr, FontStyle{}, start, end, false);
170}
171
172static void nAddReplacementRun(JNIEnv* env, jclass, jlong nativePtr,
173        jint start, jint end, jfloat width) {
174    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
175    b->addReplacement(start, end, width);
176}
177
178static void nGetWidths(JNIEnv* env, jclass, jlong nativePtr, jfloatArray widths) {
179    LineBreaker* b = reinterpret_cast<LineBreaker*>(nativePtr);
180    env->SetFloatArrayRegion(widths, 0, b->size(), b->charWidths());
181}
182
183static const JNINativeMethod gMethods[] = {
184    // TODO performance: many of these are candidates for fast jni, awaiting guidance
185    {"nNewBuilder", "()J", (void*) nNewBuilder},
186    {"nFreeBuilder", "(J)V", (void*) nFreeBuilder},
187    {"nFinishBuilder", "(J)V", (void*) nFinishBuilder},
188    {"nLoadHyphenator", "(Ljava/nio/ByteBuffer;I)J", (void*) nLoadHyphenator},
189    {"nSetLocale", "(JLjava/lang/String;J)V", (void*) nSetLocale},
190    {"nSetupParagraph", "(J[CIFIF[IIII)V", (void*) nSetupParagraph},
191    {"nSetIndents", "(J[I)V", (void*) nSetIndents},
192    {"nAddStyleRun", "(JJJIIZ)F", (void*) nAddStyleRun},
193    {"nAddMeasuredRun", "(JII[F)V", (void*) nAddMeasuredRun},
194    {"nAddReplacementRun", "(JIIF)V", (void*) nAddReplacementRun},
195    {"nGetWidths", "(J[F)V", (void*) nGetWidths},
196    {"nComputeLineBreaks", "(JLandroid/text/StaticLayout$LineBreaks;[I[F[II)I",
197        (void*) nComputeLineBreaks}
198};
199
200int register_android_text_StaticLayout(JNIEnv* env)
201{
202    gLineBreaks_class = MakeGlobalRefOrDie(env,
203            FindClassOrDie(env, "android/text/StaticLayout$LineBreaks"));
204
205    gLineBreaks_fieldID.breaks = GetFieldIDOrDie(env, gLineBreaks_class, "breaks", "[I");
206    gLineBreaks_fieldID.widths = GetFieldIDOrDie(env, gLineBreaks_class, "widths", "[F");
207    gLineBreaks_fieldID.flags = GetFieldIDOrDie(env, gLineBreaks_class, "flags", "[I");
208
209    return RegisterMethodsOrDie(env, "android/text/StaticLayout", gMethods, NELEM(gMethods));
210}
211
212}
213