android_text_StaticLayout.cpp revision c7064146f959caec058980ced144942c8044a169 
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        jboolean isJustified) {
59    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
60    b->resize(length);
61    env->GetCharArrayRegion(text, 0, length, b->buffer());
62    b->setText();
63    b->setLineWidths(firstWidth, firstWidthLineLimit, restWidth);
64    if (variableTabStops == nullptr) {
65        b->setTabStops(nullptr, 0, defaultTabStop);
66    } else {
67        ScopedIntArrayRO stops(env, variableTabStops);
68        b->setTabStops(stops.get(), stops.size(), defaultTabStop);
69    }
70    b->setStrategy(static_cast<minikin::BreakStrategy>(strategy));
71    b->setHyphenationFrequency(static_cast<minikin::HyphenationFrequency>(hyphenFrequency));
72    b->setJustified(isJustified);
73}
74
75static void recycleCopy(JNIEnv* env, jobject recycle, jintArray recycleBreaks,
76                        jfloatArray recycleWidths, jintArray recycleFlags,
77                        jint recycleLength, size_t nBreaks, const jint* breaks,
78                        const jfloat* widths, const jint* flags) {
79    if ((size_t)recycleLength < nBreaks) {
80        // have to reallocate buffers
81        recycleBreaks = env->NewIntArray(nBreaks);
82        recycleWidths = env->NewFloatArray(nBreaks);
83        recycleFlags = env->NewIntArray(nBreaks);
84
85        env->SetObjectField(recycle, gLineBreaks_fieldID.breaks, recycleBreaks);
86        env->SetObjectField(recycle, gLineBreaks_fieldID.widths, recycleWidths);
87        env->SetObjectField(recycle, gLineBreaks_fieldID.flags, recycleFlags);
88    }
89    // copy data
90    env->SetIntArrayRegion(recycleBreaks, 0, nBreaks, breaks);
91    env->SetFloatArrayRegion(recycleWidths, 0, nBreaks, widths);
92    env->SetIntArrayRegion(recycleFlags, 0, nBreaks, flags);
93}
94
95static jint nComputeLineBreaks(JNIEnv* env, jclass, jlong nativePtr,
96                               jobject recycle, jintArray recycleBreaks,
97                               jfloatArray recycleWidths, jintArray recycleFlags,
98                               jint recycleLength) {
99    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
100
101    size_t nBreaks = b->computeBreaks();
102
103    recycleCopy(env, recycle, recycleBreaks, recycleWidths, recycleFlags, recycleLength,
104            nBreaks, b->getBreaks(), b->getWidths(), b->getFlags());
105
106    b->finish();
107
108    return static_cast<jint>(nBreaks);
109}
110
111static jlong nNewBuilder(JNIEnv*, jclass) {
112    return reinterpret_cast<jlong>(new minikin::LineBreaker);
113}
114
115static void nFreeBuilder(JNIEnv*, jclass, jlong nativePtr) {
116    delete reinterpret_cast<minikin::LineBreaker*>(nativePtr);
117}
118
119static void nFinishBuilder(JNIEnv*, jclass, jlong nativePtr) {
120    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
121    b->finish();
122}
123
124static jlong nLoadHyphenator(JNIEnv* env, jclass, jobject buffer, jint offset) {
125    const uint8_t* bytebuf = nullptr;
126    if (buffer != nullptr) {
127        void* rawbuf = env->GetDirectBufferAddress(buffer);
128        if (rawbuf != nullptr) {
129            bytebuf = reinterpret_cast<const uint8_t*>(rawbuf) + offset;
130        } else {
131            ALOGE("failed to get direct buffer address");
132        }
133    }
134    minikin::Hyphenator* hyphenator = minikin::Hyphenator::loadBinary(bytebuf);
135    return reinterpret_cast<jlong>(hyphenator);
136}
137
138static void nSetLocale(JNIEnv* env, jclass, jlong nativePtr, jstring javaLocaleName,
139        jlong nativeHyphenator) {
140    ScopedIcuLocale icuLocale(env, javaLocaleName);
141    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
142    minikin::Hyphenator* hyphenator = reinterpret_cast<minikin::Hyphenator*>(nativeHyphenator);
143
144    if (icuLocale.valid()) {
145        b->setLocale(icuLocale.locale(), hyphenator);
146    }
147}
148
149static void nSetIndents(JNIEnv* env, jclass, jlong nativePtr, jintArray indents) {
150    ScopedIntArrayRO indentArr(env, indents);
151    std::vector<float> indentVec(indentArr.get(), indentArr.get() + indentArr.size());
152    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
153    b->setIndents(indentVec);
154}
155
156// Basically similar to Paint.getTextRunAdvances but with C++ interface
157static jfloat nAddStyleRun(JNIEnv* env, jclass, jlong nativePtr,
158        jlong nativePaint, jlong nativeTypeface, jint start, jint end, jboolean isRtl) {
159    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
160    Paint* paint = reinterpret_cast<Paint*>(nativePaint);
161    Typeface* typeface = reinterpret_cast<Typeface*>(nativeTypeface);
162    minikin::MinikinPaint minikinPaint;
163    Typeface* resolvedTypeface = Typeface::resolveDefault(typeface);
164    minikin::FontStyle style = MinikinUtils::prepareMinikinPaint(&minikinPaint, paint,
165            typeface);
166    return b->addStyleRun(&minikinPaint, resolvedTypeface->fFontCollection, style, start, end,
167            isRtl);
168}
169
170// Accept width measurements for the run, passed in from Java
171static void nAddMeasuredRun(JNIEnv* env, jclass, jlong nativePtr,
172        jint start, jint end, jfloatArray widths) {
173    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
174    env->GetFloatArrayRegion(widths, start, end - start, b->charWidths() + start);
175    b->addStyleRun(nullptr, nullptr, minikin::FontStyle{}, start, end, false);
176}
177
178static void nAddReplacementRun(JNIEnv* env, jclass, jlong nativePtr,
179        jint start, jint end, jfloat width) {
180    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
181    b->addReplacement(start, end, width);
182}
183
184static void nGetWidths(JNIEnv* env, jclass, jlong nativePtr, jfloatArray widths) {
185    minikin::LineBreaker* b = reinterpret_cast<minikin::LineBreaker*>(nativePtr);
186    env->SetFloatArrayRegion(widths, 0, b->size(), b->charWidths());
187}
188
189static const JNINativeMethod gMethods[] = {
190    // TODO performance: many of these are candidates for fast jni, awaiting guidance
191    {"nNewBuilder", "()J", (void*) nNewBuilder},
192    {"nFreeBuilder", "(J)V", (void*) nFreeBuilder},
193    {"nFinishBuilder", "(J)V", (void*) nFinishBuilder},
194    {"nLoadHyphenator", "(Ljava/nio/ByteBuffer;I)J", (void*) nLoadHyphenator},
195    {"nSetLocale", "(JLjava/lang/String;J)V", (void*) nSetLocale},
196    {"nSetupParagraph", "(J[CIFIF[IIIIZ)V", (void*) nSetupParagraph},
197    {"nSetIndents", "(J[I)V", (void*) nSetIndents},
198    {"nAddStyleRun", "(JJJIIZ)F", (void*) nAddStyleRun},
199    {"nAddMeasuredRun", "(JII[F)V", (void*) nAddMeasuredRun},
200    {"nAddReplacementRun", "(JIIF)V", (void*) nAddReplacementRun},
201    {"nGetWidths", "(J[F)V", (void*) nGetWidths},
202    {"nComputeLineBreaks", "(JLandroid/text/StaticLayout$LineBreaks;[I[F[II)I",
203        (void*) nComputeLineBreaks}
204};
205
206int register_android_text_StaticLayout(JNIEnv* env)
207{
208    gLineBreaks_class = MakeGlobalRefOrDie(env,
209            FindClassOrDie(env, "android/text/StaticLayout$LineBreaks"));
210
211    gLineBreaks_fieldID.breaks = GetFieldIDOrDie(env, gLineBreaks_class, "breaks", "[I");
212    gLineBreaks_fieldID.widths = GetFieldIDOrDie(env, gLineBreaks_class, "widths", "[F");
213    gLineBreaks_fieldID.flags = GetFieldIDOrDie(env, gLineBreaks_class, "flags", "[I");
214
215    return RegisterMethodsOrDie(env, "android/text/StaticLayout", gMethods, NELEM(gMethods));
216}
217
218}
219