Paint.cpp revision 46e942d500d5ce67a58269cbac3307deca6a5c9f 
1/* libs/android_runtime/android/graphics/Paint.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "Paint"
19
20#include <utils/Log.h>
21
22#include "jni.h"
23#include "GraphicsJNI.h"
24#include <android_runtime/AndroidRuntime.h>
25
26#include "SkBlurDrawLooper.h"
27#include "SkColorFilter.h"
28#include "SkMaskFilter.h"
29#include "SkRasterizer.h"
30#include "SkShader.h"
31#include "SkTypeface.h"
32#include "SkXfermode.h"
33#include "unicode/ushape.h"
34#include "TextLayout.h"
35
36// temporary for debugging
37#include <Caches.h>
38#include <utils/Log.h>
39
40namespace android {
41
42struct JMetricsID {
43    jfieldID    top;
44    jfieldID    ascent;
45    jfieldID    descent;
46    jfieldID    bottom;
47    jfieldID    leading;
48};
49
50static jclass   gFontMetrics_class;
51static JMetricsID gFontMetrics_fieldID;
52
53static jclass   gFontMetricsInt_class;
54static JMetricsID gFontMetricsInt_fieldID;
55
56static void defaultSettingsForAndroid(SkPaint* paint) {
57    // GlyphID encoding is required because we are using Harfbuzz shaping
58    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
59}
60
61class SkPaintGlue {
62public:
63    enum MoveOpt {
64        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
65    };
66
67    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
68        delete obj;
69    }
70
71    static SkPaint* init(JNIEnv* env, jobject clazz) {
72        SkPaint* obj = new SkPaint();
73        defaultSettingsForAndroid(obj);
74        return obj;
75    }
76
77    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
78        SkPaint* obj = new SkPaint(*paint);
79        return obj;
80    }
81
82    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
83        obj->reset();
84        defaultSettingsForAndroid(obj);
85    }
86
87    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
88        *dst = *src;
89    }
90
91    static jint getFlags(JNIEnv* env, jobject paint) {
92        NPE_CHECK_RETURN_ZERO(env, paint);
93        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
94    }
95
96    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
97        NPE_CHECK_RETURN_VOID(env, paint);
98        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
99    }
100
101    static jint getHinting(JNIEnv* env, jobject paint) {
102        NPE_CHECK_RETURN_ZERO(env, paint);
103        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
104                == SkPaint::kNo_Hinting ? 0 : 1;
105    }
106
107    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
108        NPE_CHECK_RETURN_VOID(env, paint);
109        GraphicsJNI::getNativePaint(env, paint)->setHinting(
110                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kSlight_Hinting);
111    }
112
113    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
114        NPE_CHECK_RETURN_VOID(env, paint);
115        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
116    }
117
118    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
119        NPE_CHECK_RETURN_VOID(env, paint);
120        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
121    }
122
123    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
124        NPE_CHECK_RETURN_VOID(env, paint);
125        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
126    }
127
128    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
129        NPE_CHECK_RETURN_VOID(env, paint);
130        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
131    }
132
133    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
134        NPE_CHECK_RETURN_VOID(env, paint);
135        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
136    }
137
138    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
139        NPE_CHECK_RETURN_VOID(env, paint);
140        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
141    }
142
143    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
144        NPE_CHECK_RETURN_VOID(env, paint);
145        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
146    }
147
148    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
149        NPE_CHECK_RETURN_VOID(env, paint);
150        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
151    }
152
153    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
154        return obj->getStyle();
155    }
156
157    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
158        obj->setStyle(style);
159    }
160
161    static jint getColor(JNIEnv* env, jobject paint) {
162        NPE_CHECK_RETURN_ZERO(env, paint);
163        return GraphicsJNI::getNativePaint(env, paint)->getColor();
164    }
165
166    static jint getAlpha(JNIEnv* env, jobject paint) {
167        NPE_CHECK_RETURN_ZERO(env, paint);
168        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
169    }
170
171    static void setColor(JNIEnv* env, jobject paint, jint color) {
172        NPE_CHECK_RETURN_VOID(env, paint);
173        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
174    }
175
176    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
177        NPE_CHECK_RETURN_VOID(env, paint);
178        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
179    }
180
181    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
182        NPE_CHECK_RETURN_ZERO(env, paint);
183        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
184    }
185
186    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
187        NPE_CHECK_RETURN_VOID(env, paint);
188        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
189    }
190
191    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
192        NPE_CHECK_RETURN_ZERO(env, paint);
193        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
194    }
195
196    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
197        NPE_CHECK_RETURN_VOID(env, paint);
198        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
199    }
200
201    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
202        return obj->getStrokeCap();
203    }
204
205    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
206        obj->setStrokeCap(cap);
207    }
208
209    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
210        return obj->getStrokeJoin();
211    }
212
213    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
214        obj->setStrokeJoin(join);
215    }
216
217    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
218        return obj->getFillPath(*src, dst);
219    }
220
221    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
222        return obj->setShader(shader);
223    }
224
225    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
226        return obj->setColorFilter(filter);
227    }
228
229    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
230        return obj->setXfermode(xfermode);
231    }
232
233    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
234        return obj->setPathEffect(effect);
235    }
236
237    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
238        return obj->setMaskFilter(maskfilter);
239    }
240
241    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
242        return obj->setTypeface(typeface);
243    }
244
245    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
246        return obj->setRasterizer(rasterizer);
247    }
248
249    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
250        return obj->getTextAlign();
251    }
252
253    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
254        obj->setTextAlign(align);
255    }
256
257    static void setTextLocale(JNIEnv* env, jobject clazz, SkPaint* obj, jstring locale) {
258        const char* localeArray = env->GetStringUTFChars(locale, NULL);
259        SkString skLocale(localeArray);
260        obj->setTextLocale(skLocale);
261        env->ReleaseStringUTFChars(locale, localeArray);
262    }
263
264    static jfloat getTextSize(JNIEnv* env, jobject paint) {
265        NPE_CHECK_RETURN_ZERO(env, paint);
266        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
267    }
268
269    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
270        NPE_CHECK_RETURN_VOID(env, paint);
271        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
272    }
273
274    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
275        NPE_CHECK_RETURN_ZERO(env, paint);
276        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
277    }
278
279    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
280        NPE_CHECK_RETURN_VOID(env, paint);
281        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
282    }
283
284    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
285        NPE_CHECK_RETURN_ZERO(env, paint);
286        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
287    }
288
289    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
290        NPE_CHECK_RETURN_VOID(env, paint);
291        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
292    }
293
294    static jfloat ascent(JNIEnv* env, jobject paint) {
295        NPE_CHECK_RETURN_ZERO(env, paint);
296        SkPaint::FontMetrics    metrics;
297        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
298        return SkScalarToFloat(metrics.fAscent);
299    }
300
301    static jfloat descent(JNIEnv* env, jobject paint) {
302        NPE_CHECK_RETURN_ZERO(env, paint);
303        SkPaint::FontMetrics    metrics;
304        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
305        return SkScalarToFloat(metrics.fDescent);
306    }
307
308    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
309        NPE_CHECK_RETURN_ZERO(env, paint);
310        SkPaint::FontMetrics metrics;
311        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
312
313        if (metricsObj) {
314            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
315            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
316            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
317            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
318            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
319            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
320        }
321        return SkScalarToFloat(spacing);
322    }
323
324    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
325        NPE_CHECK_RETURN_ZERO(env, paint);
326        SkPaint::FontMetrics metrics;
327
328        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
329        int ascent = SkScalarRound(metrics.fAscent);
330        int descent = SkScalarRound(metrics.fDescent);
331        int leading = SkScalarRound(metrics.fLeading);
332
333        if (metricsObj) {
334            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
335            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
336            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
337            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
338            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
339            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
340        }
341        return descent - ascent + leading;
342    }
343
344    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
345        NPE_CHECK_RETURN_ZERO(env, jpaint);
346        NPE_CHECK_RETURN_ZERO(env, text);
347
348        size_t textLength = env->GetArrayLength(text);
349        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
350            doThrowAIOOBE(env);
351            return 0;
352        }
353        if (count == 0) {
354            return 0;
355        }
356
357        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
358        const jchar* textArray = env->GetCharArrayElements(text, NULL);
359        jfloat result = 0;
360
361        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
362                paint->getFlags(), NULL /* dont need all advances */, &result);
363
364        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
365        return result;
366    }
367
368    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
369        NPE_CHECK_RETURN_ZERO(env, jpaint);
370        NPE_CHECK_RETURN_ZERO(env, text);
371
372        size_t textLength = env->GetStringLength(text);
373        int count = end - start;
374        if ((start | count) < 0 || (size_t)end > textLength) {
375            doThrowAIOOBE(env);
376            return 0;
377        }
378        if (count == 0) {
379            return 0;
380        }
381
382        const jchar* textArray = env->GetStringChars(text, NULL);
383        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
384        jfloat width = 0;
385
386        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
387                paint->getFlags(), NULL /* dont need all advances */, &width);
388
389        env->ReleaseStringChars(text, textArray);
390        return width;
391    }
392
393    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
394        NPE_CHECK_RETURN_ZERO(env, jpaint);
395        NPE_CHECK_RETURN_ZERO(env, text);
396
397        size_t textLength = env->GetStringLength(text);
398        if (textLength == 0) {
399            return 0;
400        }
401
402        const jchar* textArray = env->GetStringChars(text, NULL);
403        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
404        jfloat width = 0;
405
406        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
407                paint->getFlags(), NULL /* dont need all advances */, &width);
408
409        env->ReleaseStringChars(text, textArray);
410        return width;
411    }
412
413    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
414        NPE_CHECK_RETURN_ZERO(env, paint);
415        NPE_CHECK_RETURN_ZERO(env, text);
416
417        if (count < 0 || !widths) {
418            doThrowAIOOBE(env);
419            return 0;
420        }
421        if (count == 0) {
422            return 0;
423        }
424        size_t widthsLength = env->GetArrayLength(widths);
425        if ((size_t)count > widthsLength) {
426            doThrowAIOOBE(env);
427            return 0;
428        }
429
430        AutoJavaFloatArray autoWidths(env, widths, count);
431        jfloat* widthsArray = autoWidths.ptr();
432
433        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
434                paint->getFlags(), widthsArray, NULL /* dont need totalAdvance */);
435
436        return count;
437    }
438
439    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
440        const jchar* textArray = env->GetCharArrayElements(text, NULL);
441        count = dotextwidths(env, paint, textArray + index, count, widths);
442        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
443                                      JNI_ABORT);
444        return count;
445    }
446
447    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
448            int start, int end, jfloatArray widths) {
449        const jchar* textArray = env->GetStringChars(text, NULL);
450        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
451        env->ReleaseStringChars(text, textArray);
452        return count;
453    }
454
455    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
456            jint contextCount, jint flags, jcharArray glyphs) {
457        NPE_CHECK_RETURN_ZERO(env, paint);
458        NPE_CHECK_RETURN_ZERO(env, text);
459
460        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
461            doThrowAIOOBE(env);
462            return 0;
463        }
464        if (count == 0) {
465            return 0;
466        }
467        size_t glypthsLength = env->GetArrayLength(glyphs);
468        if ((size_t)count > glypthsLength) {
469            doThrowAIOOBE(env);
470            return 0;
471        }
472
473        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
474
475        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
476                text, start, count, contextCount, flags);
477        const jchar* shapedGlyphs = value->getGlyphs();
478        size_t glyphsCount = value->getGlyphsCount();
479        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
480
481        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
482        return glyphsCount;
483    }
484
485    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
486            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
487            jcharArray glyphs) {
488        const jchar* textArray = env->GetStringChars(text, NULL);
489        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
490                end - start, contextEnd - contextStart, flags, glyphs);
491        env->ReleaseStringChars(text, textArray);
492        return count;
493    }
494
495    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
496                                    jint start, jint count, jint contextCount, jint flags,
497                                    jfloatArray advances, jint advancesIndex) {
498        NPE_CHECK_RETURN_ZERO(env, paint);
499        NPE_CHECK_RETURN_ZERO(env, text);
500
501        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
502            doThrowAIOOBE(env);
503            return 0;
504        }
505        if (count == 0) {
506            return 0;
507        }
508        if (advances) {
509            size_t advancesLength = env->GetArrayLength(advances);
510            if ((size_t)count > advancesLength) {
511                doThrowAIOOBE(env);
512                return 0;
513            }
514        }
515        jfloat advancesArray[count];
516        jfloat totalAdvance = 0;
517
518        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
519                                       advancesArray, &totalAdvance);
520
521        if (advances != NULL) {
522            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
523        }
524        return totalAdvance;
525    }
526
527    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
528                                    jint start, jint count, jint contextCount, jint flags,
529                                    jfloatArray advances, jint advancesIndex) {
530        NPE_CHECK_RETURN_ZERO(env, paint);
531        NPE_CHECK_RETURN_ZERO(env, text);
532
533        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
534            doThrowAIOOBE(env);
535            return 0;
536        }
537        if (count == 0) {
538            return 0;
539        }
540        if (advances) {
541            size_t advancesLength = env->GetArrayLength(advances);
542            if ((size_t)count > advancesLength) {
543                doThrowAIOOBE(env);
544                return 0;
545            }
546        }
547
548        jfloat advancesArray[count];
549        jfloat totalAdvance = 0;
550
551        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
552                                       advancesArray, totalAdvance);
553
554        if (advances != NULL) {
555            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
556        }
557        return totalAdvance;
558    }
559
560    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
561            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
562            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
563        jchar* textArray = env->GetCharArrayElements(text, NULL);
564        jfloat result = (reserved == 0) ?
565                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
566                        count, contextCount, flags, advances, advancesIndex) :
567                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
568                        count, contextCount, flags, advances, advancesIndex);
569        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
570        return result;
571    }
572
573    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
574            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
575            jfloatArray advances, jint advancesIndex, jint reserved) {
576        const jchar* textArray = env->GetStringChars(text, NULL);
577        jfloat result = (reserved == 0) ?
578                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
579                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
580                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
581                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
582        env->ReleaseStringChars(text, textArray);
583        return result;
584    }
585
586    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
587            jint count, jint flags, jint offset, jint opt) {
588        jfloat scalarArray[count];
589
590        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
591                scalarArray, NULL /* dont need totalAdvance */);
592
593        jint pos = offset - start;
594        switch (opt) {
595        case AFTER:
596          if (pos < count) {
597            pos += 1;
598          }
599          // fall through
600        case AT_OR_AFTER:
601          while (pos < count && scalarArray[pos] == 0) {
602            ++pos;
603          }
604          break;
605        case BEFORE:
606          if (pos > 0) {
607            --pos;
608          }
609          // fall through
610        case AT_OR_BEFORE:
611          while (pos > 0 && scalarArray[pos] == 0) {
612            --pos;
613          }
614          break;
615        case AT:
616        default:
617          if (scalarArray[pos] == 0) {
618            pos = -1;
619          }
620          break;
621        }
622
623        if (pos != -1) {
624          pos += start;
625        }
626
627        return pos;
628    }
629
630    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
631            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
632        jchar* textArray = env->GetCharArrayElements(text, NULL);
633        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
634                offset, cursorOpt);
635        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
636        return result;
637    }
638
639    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
640            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
641        const jchar* textArray = env->GetStringChars(text, NULL);
642        jint result = doTextRunCursor(env, paint, textArray, contextStart,
643                contextEnd - contextStart, flags, offset, cursorOpt);
644        env->ReleaseStringChars(text, textArray);
645        return result;
646    }
647
648    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
649                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
650        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
651    }
652
653    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
654            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
655        const jchar* textArray = env->GetCharArrayElements(text, NULL);
656        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
657        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
658    }
659
660    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
661            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
662        const jchar* textArray = env->GetStringChars(text, NULL);
663        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
664        env->ReleaseStringChars(text, textArray);
665    }
666
667    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
668                               jfloat dx, jfloat dy, int color) {
669        NPE_CHECK_RETURN_VOID(env, jpaint);
670
671        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
672        if (radius <= 0) {
673            paint->setLooper(NULL);
674        }
675        else {
676            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
677                                                  SkFloatToScalar(dx),
678                                                  SkFloatToScalar(dy),
679                                                  (SkColor)color))->unref();
680        }
681    }
682
683    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
684                         int count, float maxWidth, jfloatArray jmeasured,
685                         SkPaint::TextBufferDirection tbd) {
686        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
687                text, 0, count, count, paint.getFlags());
688        if (value == NULL) {
689            return 0;
690        }
691        SkScalar     measured;
692        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
693                                   SkFloatToScalar(maxWidth), &measured, tbd);
694        SkASSERT((bytes & 1) == 0);
695
696        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
697            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
698            jfloat* array = autoMeasured.ptr();
699            array[0] = SkScalarToFloat(measured);
700        }
701        return bytes >> 1;
702    }
703
704    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
705            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
706        NPE_CHECK_RETURN_ZERO(env, jpaint);
707        NPE_CHECK_RETURN_ZERO(env, jtext);
708
709        SkPaint::TextBufferDirection tbd;
710        if (count < 0) {
711            tbd = SkPaint::kBackward_TextBufferDirection;
712            count = -count;
713        }
714        else {
715            tbd = SkPaint::kForward_TextBufferDirection;
716        }
717
718        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
719            doThrowAIOOBE(env);
720            return 0;
721        }
722
723        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
724        const jchar* text = env->GetCharArrayElements(jtext, NULL);
725        count = breakText(env, *paint, text + index, count, maxWidth,
726                          jmeasuredWidth, tbd);
727        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
728                                      JNI_ABORT);
729        return count;
730    }
731
732    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
733                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
734        NPE_CHECK_RETURN_ZERO(env, jpaint);
735        NPE_CHECK_RETURN_ZERO(env, jtext);
736
737        SkPaint::TextBufferDirection tbd = forwards ?
738                                        SkPaint::kForward_TextBufferDirection :
739                                        SkPaint::kBackward_TextBufferDirection;
740
741        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
742        int count = env->GetStringLength(jtext);
743        const jchar* text = env->GetStringChars(jtext, NULL);
744        count = breakText(env, *paint, text, count, maxWidth,
745                          jmeasuredWidth, tbd);
746        env->ReleaseStringChars(jtext, text);
747        return count;
748    }
749
750    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
751                             jobject bounds, const SkPaint& paint)
752    {
753        SkRect  r{0,0,0,0};
754        SkIRect ir;
755
756        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
757                text, 0, count, count, paint.getFlags());
758        if (value == NULL) {
759            return;
760        }
761        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
762        r.roundOut(&ir);
763        GraphicsJNI::irect_to_jrect(ir, env, bounds);
764    }
765
766    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
767                                jstring text, int start, int end, jobject bounds)
768    {
769        const jchar* textArray = env->GetStringChars(text, NULL);
770        doTextBounds(env, textArray + start, end - start, bounds, *paint);
771        env->ReleaseStringChars(text, textArray);
772    }
773
774    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
775                        jcharArray text, int index, int count, jobject bounds)
776    {
777        const jchar* textArray = env->GetCharArrayElements(text, NULL);
778        doTextBounds(env, textArray + index, count, bounds, *paint);
779        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
780                                      JNI_ABORT);
781    }
782
783};
784
785static JNINativeMethod methods[] = {
786    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
787    {"native_init","()I", (void*) SkPaintGlue::init},
788    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
789    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
790    {"native_set","(II)V", (void*) SkPaintGlue::assign},
791    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
792    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
793    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
794    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
795    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
796    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
797    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
798    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
799    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
800    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
801    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
802    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
803    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
804    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
805    {"getColor","()I", (void*) SkPaintGlue::getColor},
806    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
807    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
808    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
809    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
810    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
811    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
812    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
813    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
814    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
815    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
816    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
817    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
818    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
819    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
820    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
821    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
822    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
823    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
824    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
825    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
826    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
827    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
828    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
829    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
830    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
831    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
832    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
833    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
834    {"ascent","()F", (void*) SkPaintGlue::ascent},
835    {"descent","()F", (void*) SkPaintGlue::descent},
836    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
837    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
838    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
839    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
840    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
841    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
842    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
843    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
844    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
845    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
846        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
847    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
848        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
849
850
851    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
852        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
853    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
854    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
855        (void*) SkPaintGlue::getTextRunCursor__String},
856    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
857    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
858    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
859                                        (void*) SkPaintGlue::getStringBounds },
860    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
861                                    (void*) SkPaintGlue::getCharArrayBounds },
862    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
863};
864
865static jfieldID req_fieldID(jfieldID id) {
866    SkASSERT(id);
867    return id;
868}
869
870int register_android_graphics_Paint(JNIEnv* env) {
871    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
872    SkASSERT(gFontMetrics_class);
873    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
874
875    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
876    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
877    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
878    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
879    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
880
881    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
882    SkASSERT(gFontMetricsInt_class);
883    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
884
885    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
886    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
887    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
888    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
889    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
890
891    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
892        sizeof(methods) / sizeof(methods[0]));
893    return result;
894}
895
896}
897