Paint.cpp revision 1c12f9e76298c757423155ad812890d27effafe8 
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 = new jfloat[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        delete [] advancesArray;
525        return totalAdvance;
526    }
527
528    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
529                                    jint start, jint count, jint contextCount, jint flags,
530                                    jfloatArray advances, jint advancesIndex) {
531        NPE_CHECK_RETURN_ZERO(env, paint);
532        NPE_CHECK_RETURN_ZERO(env, text);
533
534        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
535            doThrowAIOOBE(env);
536            return 0;
537        }
538        if (count == 0) {
539            return 0;
540        }
541        if (advances) {
542            size_t advancesLength = env->GetArrayLength(advances);
543            if ((size_t)count > advancesLength) {
544                doThrowAIOOBE(env);
545                return 0;
546            }
547        }
548
549        jfloat advancesArray[count];
550        jfloat totalAdvance = 0;
551
552        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
553                                       advancesArray, totalAdvance);
554
555        if (advances != NULL) {
556            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
557        }
558        return totalAdvance;
559    }
560
561    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
562            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
563            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
564        jchar* textArray = env->GetCharArrayElements(text, NULL);
565        jfloat result = (reserved == 0) ?
566                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
567                        count, contextCount, flags, advances, advancesIndex) :
568                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
569                        count, contextCount, flags, advances, advancesIndex);
570        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
571        return result;
572    }
573
574    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
575            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
576            jfloatArray advances, jint advancesIndex, jint reserved) {
577        const jchar* textArray = env->GetStringChars(text, NULL);
578        jfloat result = (reserved == 0) ?
579                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
580                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
581                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
582                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
583        env->ReleaseStringChars(text, textArray);
584        return result;
585    }
586
587    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
588            jint count, jint flags, jint offset, jint opt) {
589        jfloat scalarArray[count];
590
591        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
592                scalarArray, NULL /* dont need totalAdvance */);
593
594        jint pos = offset - start;
595        switch (opt) {
596        case AFTER:
597          if (pos < count) {
598            pos += 1;
599          }
600          // fall through
601        case AT_OR_AFTER:
602          while (pos < count && scalarArray[pos] == 0) {
603            ++pos;
604          }
605          break;
606        case BEFORE:
607          if (pos > 0) {
608            --pos;
609          }
610          // fall through
611        case AT_OR_BEFORE:
612          while (pos > 0 && scalarArray[pos] == 0) {
613            --pos;
614          }
615          break;
616        case AT:
617        default:
618          if (scalarArray[pos] == 0) {
619            pos = -1;
620          }
621          break;
622        }
623
624        if (pos != -1) {
625          pos += start;
626        }
627
628        return pos;
629    }
630
631    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
632            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
633        jchar* textArray = env->GetCharArrayElements(text, NULL);
634        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
635                offset, cursorOpt);
636        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
637        return result;
638    }
639
640    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
641            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
642        const jchar* textArray = env->GetStringChars(text, NULL);
643        jint result = doTextRunCursor(env, paint, textArray, contextStart,
644                contextEnd - contextStart, flags, offset, cursorOpt);
645        env->ReleaseStringChars(text, textArray);
646        return result;
647    }
648
649    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
650                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
651        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
652    }
653
654    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
655            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
656        const jchar* textArray = env->GetCharArrayElements(text, NULL);
657        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
658        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
659    }
660
661    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
662            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
663        const jchar* textArray = env->GetStringChars(text, NULL);
664        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
665        env->ReleaseStringChars(text, textArray);
666    }
667
668    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
669                               jfloat dx, jfloat dy, int color) {
670        NPE_CHECK_RETURN_VOID(env, jpaint);
671
672        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
673        if (radius <= 0) {
674            paint->setLooper(NULL);
675        }
676        else {
677            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
678                                                  SkFloatToScalar(dx),
679                                                  SkFloatToScalar(dy),
680                                                  (SkColor)color))->unref();
681        }
682    }
683
684    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
685                         int count, float maxWidth, jfloatArray jmeasured,
686                         SkPaint::TextBufferDirection tbd) {
687        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
688                text, 0, count, count, paint.getFlags());
689        if (value == NULL) {
690            return 0;
691        }
692        SkScalar     measured;
693        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
694                                   SkFloatToScalar(maxWidth), &measured, tbd);
695        SkASSERT((bytes & 1) == 0);
696
697        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
698            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
699            jfloat* array = autoMeasured.ptr();
700            array[0] = SkScalarToFloat(measured);
701        }
702        return bytes >> 1;
703    }
704
705    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
706            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
707        NPE_CHECK_RETURN_ZERO(env, jpaint);
708        NPE_CHECK_RETURN_ZERO(env, jtext);
709
710        SkPaint::TextBufferDirection tbd;
711        if (count < 0) {
712            tbd = SkPaint::kBackward_TextBufferDirection;
713            count = -count;
714        }
715        else {
716            tbd = SkPaint::kForward_TextBufferDirection;
717        }
718
719        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
720            doThrowAIOOBE(env);
721            return 0;
722        }
723
724        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
725        const jchar* text = env->GetCharArrayElements(jtext, NULL);
726        count = breakText(env, *paint, text + index, count, maxWidth,
727                          jmeasuredWidth, tbd);
728        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
729                                      JNI_ABORT);
730        return count;
731    }
732
733    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
734                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
735        NPE_CHECK_RETURN_ZERO(env, jpaint);
736        NPE_CHECK_RETURN_ZERO(env, jtext);
737
738        SkPaint::TextBufferDirection tbd = forwards ?
739                                        SkPaint::kForward_TextBufferDirection :
740                                        SkPaint::kBackward_TextBufferDirection;
741
742        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
743        int count = env->GetStringLength(jtext);
744        const jchar* text = env->GetStringChars(jtext, NULL);
745        count = breakText(env, *paint, text, count, maxWidth,
746                          jmeasuredWidth, tbd);
747        env->ReleaseStringChars(jtext, text);
748        return count;
749    }
750
751    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
752                             jobject bounds, const SkPaint& paint)
753    {
754        SkRect  r;
755        SkIRect ir;
756
757        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
758                text, 0, count, count, paint.getFlags());
759        if (value == NULL) {
760            return;
761        }
762        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
763        r.roundOut(&ir);
764        GraphicsJNI::irect_to_jrect(ir, env, bounds);
765    }
766
767    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
768                                jstring text, int start, int end, jobject bounds)
769    {
770        const jchar* textArray = env->GetStringChars(text, NULL);
771        doTextBounds(env, textArray + start, end - start, bounds, *paint);
772        env->ReleaseStringChars(text, textArray);
773    }
774
775    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
776                        jcharArray text, int index, int count, jobject bounds)
777    {
778        const jchar* textArray = env->GetCharArrayElements(text, NULL);
779        doTextBounds(env, textArray + index, count, bounds, *paint);
780        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
781                                      JNI_ABORT);
782    }
783
784};
785
786static JNINativeMethod methods[] = {
787    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
788    {"native_init","()I", (void*) SkPaintGlue::init},
789    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
790    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
791    {"native_set","(II)V", (void*) SkPaintGlue::assign},
792    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
793    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
794    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
795    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
796    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
797    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
798    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
799    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
800    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
801    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
802    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
803    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
804    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
805    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
806    {"getColor","()I", (void*) SkPaintGlue::getColor},
807    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
808    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
809    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
810    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
811    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
812    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
813    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
814    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
815    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
816    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
817    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
818    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
819    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
820    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
821    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
822    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
823    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
824    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
825    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
826    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
827    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
828    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
829    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
830    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
831    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
832    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
833    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
834    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
835    {"ascent","()F", (void*) SkPaintGlue::ascent},
836    {"descent","()F", (void*) SkPaintGlue::descent},
837    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
838    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
839    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
840    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
841    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
842    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
843    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
844    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
845    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
846    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
847        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
848    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
849        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
850
851
852    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
853        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
854    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
855    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
856        (void*) SkPaintGlue::getTextRunCursor__String},
857    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
858    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
859    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
860                                        (void*) SkPaintGlue::getStringBounds },
861    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
862                                    (void*) SkPaintGlue::getCharArrayBounds },
863    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
864};
865
866static jfieldID req_fieldID(jfieldID id) {
867    SkASSERT(id);
868    return id;
869}
870
871int register_android_graphics_Paint(JNIEnv* env) {
872    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
873    SkASSERT(gFontMetrics_class);
874    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
875
876    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
877    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
878    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
879    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
880    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
881
882    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
883    SkASSERT(gFontMetricsInt_class);
884    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
885
886    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
887    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
888    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
889    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
890    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
891
892    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
893        sizeof(methods) / sizeof(methods[0]));
894    return result;
895}
896
897}
898