Paint.cpp revision b02d0ca5553300063e4332192632312600caf4b9 
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    // utf16 is required for java
58    paint->setTextEncoding(SkPaint::kUTF16_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 jfloat getTextSize(JNIEnv* env, jobject paint) {
258        NPE_CHECK_RETURN_ZERO(env, paint);
259        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
260    }
261
262    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
263        NPE_CHECK_RETURN_VOID(env, paint);
264        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
265    }
266
267    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
268        NPE_CHECK_RETURN_ZERO(env, paint);
269        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
270    }
271
272    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
273        NPE_CHECK_RETURN_VOID(env, paint);
274        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
275    }
276
277    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
278        NPE_CHECK_RETURN_ZERO(env, paint);
279        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
280    }
281
282    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
283        NPE_CHECK_RETURN_VOID(env, paint);
284        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
285    }
286
287    static jfloat ascent(JNIEnv* env, jobject paint) {
288        NPE_CHECK_RETURN_ZERO(env, paint);
289        SkPaint::FontMetrics    metrics;
290        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
291        return SkScalarToFloat(metrics.fAscent);
292    }
293
294    static jfloat descent(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.fDescent);
299    }
300
301    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
302        NPE_CHECK_RETURN_ZERO(env, paint);
303        SkPaint::FontMetrics metrics;
304        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
305
306        if (metricsObj) {
307            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
308            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
309            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
310            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
311            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
312            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
313        }
314        return SkScalarToFloat(spacing);
315    }
316
317    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
318        NPE_CHECK_RETURN_ZERO(env, paint);
319        SkPaint::FontMetrics metrics;
320
321        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
322        int ascent = SkScalarRound(metrics.fAscent);
323        int descent = SkScalarRound(metrics.fDescent);
324        int leading = SkScalarRound(metrics.fLeading);
325
326        if (metricsObj) {
327            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
328            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
329            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
330            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
331            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
332            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
333        }
334        return descent - ascent + leading;
335    }
336
337    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
338        NPE_CHECK_RETURN_ZERO(env, jpaint);
339        NPE_CHECK_RETURN_ZERO(env, text);
340
341        size_t textLength = env->GetArrayLength(text);
342        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
343            doThrowAIOOBE(env);
344            return 0;
345        }
346        if (count == 0) {
347            return 0;
348        }
349
350        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
351        const jchar* textArray = env->GetCharArrayElements(text, NULL);
352        jfloat result = 0;
353
354        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
355                paint->getFlags(), NULL /* dont need all advances */, &result);
356
357        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
358        return result;
359    }
360
361    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
362        NPE_CHECK_RETURN_ZERO(env, jpaint);
363        NPE_CHECK_RETURN_ZERO(env, text);
364
365        size_t textLength = env->GetStringLength(text);
366        int count = end - start;
367        if ((start | count) < 0 || (size_t)end > textLength) {
368            doThrowAIOOBE(env);
369            return 0;
370        }
371        if (count == 0) {
372            return 0;
373        }
374
375        const jchar* textArray = env->GetStringChars(text, NULL);
376        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
377        jfloat width = 0;
378
379        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
380                paint->getFlags(), NULL /* dont need all advances */, &width);
381
382        env->ReleaseStringChars(text, textArray);
383        return width;
384    }
385
386    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
387        NPE_CHECK_RETURN_ZERO(env, jpaint);
388        NPE_CHECK_RETURN_ZERO(env, text);
389
390        size_t textLength = env->GetStringLength(text);
391        if (textLength == 0) {
392            return 0;
393        }
394
395        const jchar* textArray = env->GetStringChars(text, NULL);
396        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
397        jfloat width = 0;
398
399        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
400                paint->getFlags(), NULL /* dont need all advances */, &width);
401
402        env->ReleaseStringChars(text, textArray);
403        return width;
404    }
405
406    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
407        NPE_CHECK_RETURN_ZERO(env, paint);
408        NPE_CHECK_RETURN_ZERO(env, text);
409
410        if (count < 0 || !widths) {
411            doThrowAIOOBE(env);
412            return 0;
413        }
414        if (count == 0) {
415            return 0;
416        }
417        size_t widthsLength = env->GetArrayLength(widths);
418        if ((size_t)count > widthsLength) {
419            doThrowAIOOBE(env);
420            return 0;
421        }
422
423        AutoJavaFloatArray autoWidths(env, widths, count);
424        jfloat* widthsArray = autoWidths.ptr();
425
426        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
427                paint->getFlags(), widthsArray, NULL /* dont need totalAdvance */);
428
429        return count;
430    }
431
432    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
433        const jchar* textArray = env->GetCharArrayElements(text, NULL);
434        count = dotextwidths(env, paint, textArray + index, count, widths);
435        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
436                                      JNI_ABORT);
437        return count;
438    }
439
440    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
441            int start, int end, jfloatArray widths) {
442        const jchar* textArray = env->GetStringChars(text, NULL);
443        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
444        env->ReleaseStringChars(text, textArray);
445        return count;
446    }
447
448    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
449            jint contextCount, jint flags, jcharArray glyphs) {
450        NPE_CHECK_RETURN_ZERO(env, paint);
451        NPE_CHECK_RETURN_ZERO(env, text);
452
453        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
454            doThrowAIOOBE(env);
455            return 0;
456        }
457        if (count == 0) {
458            return 0;
459        }
460        size_t glypthsLength = env->GetArrayLength(glyphs);
461        if ((size_t)count > glypthsLength) {
462            doThrowAIOOBE(env);
463            return 0;
464        }
465
466        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
467
468        TextLayoutCacheValue value(contextCount);
469        TextLayoutEngine::getInstance().computeValues(&value, paint, text, start, count, contextCount, flags);
470        const jchar* shapedGlyphs = value.getGlyphs();
471        size_t glyphsCount = value.getGlyphsCount();
472        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
473
474        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
475        return glyphsCount;
476    }
477
478    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
479            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
480            jcharArray glyphs) {
481        const jchar* textArray = env->GetStringChars(text, NULL);
482        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
483                end - start, contextEnd - contextStart, flags, glyphs);
484        env->ReleaseStringChars(text, textArray);
485        return count;
486    }
487
488    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
489                                    jint start, jint count, jint contextCount, jint flags,
490                                    jfloatArray advances, jint advancesIndex) {
491        NPE_CHECK_RETURN_ZERO(env, paint);
492        NPE_CHECK_RETURN_ZERO(env, text);
493
494        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
495            doThrowAIOOBE(env);
496            return 0;
497        }
498        if (count == 0) {
499            return 0;
500        }
501        if (advances) {
502            size_t advancesLength = env->GetArrayLength(advances);
503            if ((size_t)count > advancesLength) {
504                doThrowAIOOBE(env);
505                return 0;
506            }
507        }
508        jfloat advancesArray[count];
509        jfloat totalAdvance = 0;
510
511        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
512                                       advancesArray, &totalAdvance);
513
514        if (advances != NULL) {
515            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
516        }
517        return totalAdvance;
518    }
519
520    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
521                                    jint start, jint count, jint contextCount, jint flags,
522                                    jfloatArray advances, jint advancesIndex) {
523        NPE_CHECK_RETURN_ZERO(env, paint);
524        NPE_CHECK_RETURN_ZERO(env, text);
525
526        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
527            doThrowAIOOBE(env);
528            return 0;
529        }
530        if (count == 0) {
531            return 0;
532        }
533        if (advances) {
534            size_t advancesLength = env->GetArrayLength(advances);
535            if ((size_t)count > advancesLength) {
536                doThrowAIOOBE(env);
537                return 0;
538            }
539        }
540
541        jfloat advancesArray[count];
542        jfloat totalAdvance = 0;
543
544        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
545                                       advancesArray, totalAdvance);
546
547        if (advances != NULL) {
548            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
549        }
550        return totalAdvance;
551    }
552
553    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
554            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
555            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
556        jchar* textArray = env->GetCharArrayElements(text, NULL);
557        jfloat result = (reserved == 0) ?
558                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
559                        count, contextCount, flags, advances, advancesIndex) :
560                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
561                        count, contextCount, flags, advances, advancesIndex);
562        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
563        return result;
564    }
565
566    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
567            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
568            jfloatArray advances, jint advancesIndex, jint reserved) {
569        const jchar* textArray = env->GetStringChars(text, NULL);
570        jfloat result = (reserved == 0) ?
571                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
572                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
573                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
574                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
575        env->ReleaseStringChars(text, textArray);
576        return result;
577    }
578
579    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
580            jint count, jint flags, jint offset, jint opt) {
581        jfloat scalarArray[count];
582
583        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
584                scalarArray, NULL /* dont need totalAdvance */);
585
586        jint pos = offset - start;
587        switch (opt) {
588        case AFTER:
589          if (pos < count) {
590            pos += 1;
591          }
592          // fall through
593        case AT_OR_AFTER:
594          while (pos < count && scalarArray[pos] == 0) {
595            ++pos;
596          }
597          break;
598        case BEFORE:
599          if (pos > 0) {
600            --pos;
601          }
602          // fall through
603        case AT_OR_BEFORE:
604          while (pos > 0 && scalarArray[pos] == 0) {
605            --pos;
606          }
607          break;
608        case AT:
609        default:
610          if (scalarArray[pos] == 0) {
611            pos = -1;
612          }
613          break;
614        }
615
616        if (pos != -1) {
617          pos += start;
618        }
619
620        return pos;
621    }
622
623    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
624            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
625        jchar* textArray = env->GetCharArrayElements(text, NULL);
626        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
627                offset, cursorOpt);
628        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
629        return result;
630    }
631
632    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
633            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
634        const jchar* textArray = env->GetStringChars(text, NULL);
635        jint result = doTextRunCursor(env, paint, textArray, contextStart,
636                contextEnd - contextStart, flags, offset, cursorOpt);
637        env->ReleaseStringChars(text, textArray);
638        return result;
639    }
640
641    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
642                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
643        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
644    }
645
646    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
647            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
648        const jchar* textArray = env->GetCharArrayElements(text, NULL);
649        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
650        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
651    }
652
653    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
654            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
655        const jchar* textArray = env->GetStringChars(text, NULL);
656        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
657        env->ReleaseStringChars(text, textArray);
658    }
659
660    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
661                               jfloat dx, jfloat dy, int color) {
662        NPE_CHECK_RETURN_VOID(env, jpaint);
663
664        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
665        if (radius <= 0) {
666            paint->setLooper(NULL);
667        }
668        else {
669            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
670                                                  SkFloatToScalar(dx),
671                                                  SkFloatToScalar(dy),
672                                                  (SkColor)color))->unref();
673        }
674    }
675
676    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
677                         int count, float maxWidth, jfloatArray jmeasured,
678                         SkPaint::TextBufferDirection tbd) {
679        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
680
681        SkScalar     measured;
682        size_t       bytes = paint.breakText(text, count << 1,
683                                   SkFloatToScalar(maxWidth), &measured, tbd);
684        SkASSERT((bytes & 1) == 0);
685
686        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
687            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
688            jfloat* array = autoMeasured.ptr();
689            array[0] = SkScalarToFloat(measured);
690        }
691        return bytes >> 1;
692    }
693
694    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
695            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
696        NPE_CHECK_RETURN_ZERO(env, jpaint);
697        NPE_CHECK_RETURN_ZERO(env, jtext);
698
699        SkPaint::TextBufferDirection tbd;
700        if (count < 0) {
701            tbd = SkPaint::kBackward_TextBufferDirection;
702            count = -count;
703        }
704        else {
705            tbd = SkPaint::kForward_TextBufferDirection;
706        }
707
708        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
709            doThrowAIOOBE(env);
710            return 0;
711        }
712
713        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
714        const jchar* text = env->GetCharArrayElements(jtext, NULL);
715        count = breakText(env, *paint, text + index, count, maxWidth,
716                          jmeasuredWidth, tbd);
717        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
718                                      JNI_ABORT);
719        return count;
720    }
721
722    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
723                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
724        NPE_CHECK_RETURN_ZERO(env, jpaint);
725        NPE_CHECK_RETURN_ZERO(env, jtext);
726
727        SkPaint::TextBufferDirection tbd = forwards ?
728                                        SkPaint::kForward_TextBufferDirection :
729                                        SkPaint::kBackward_TextBufferDirection;
730
731        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
732        int count = env->GetStringLength(jtext);
733        const jchar* text = env->GetStringChars(jtext, NULL);
734        count = breakText(env, *paint, text, count, maxWidth,
735                          jmeasuredWidth, tbd);
736        env->ReleaseStringChars(jtext, text);
737        return count;
738    }
739
740    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
741                             jobject bounds, const SkPaint& paint)
742    {
743        SkRect  r;
744        SkIRect ir;
745
746        paint.measureText(text, count << 1, &r);
747        r.roundOut(&ir);
748        GraphicsJNI::irect_to_jrect(ir, env, bounds);
749    }
750
751    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
752                                jstring text, int start, int end, jobject bounds)
753    {
754        const jchar* textArray = env->GetStringChars(text, NULL);
755        doTextBounds(env, textArray + start, end - start, bounds, *paint);
756        env->ReleaseStringChars(text, textArray);
757    }
758
759    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
760                        jcharArray text, int index, int count, jobject bounds)
761    {
762        const jchar* textArray = env->GetCharArrayElements(text, NULL);
763        doTextBounds(env, textArray + index, count, bounds, *paint);
764        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
765                                      JNI_ABORT);
766    }
767
768};
769
770static JNINativeMethod methods[] = {
771    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
772    {"native_init","()I", (void*) SkPaintGlue::init},
773    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
774    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
775    {"native_set","(II)V", (void*) SkPaintGlue::assign},
776    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
777    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
778    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
779    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
780    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
781    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
782    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
783    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
784    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
785    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
786    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
787    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
788    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
789    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
790    {"getColor","()I", (void*) SkPaintGlue::getColor},
791    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
792    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
793    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
794    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
795    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
796    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
797    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
798    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
799    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
800    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
801    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
802    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
803    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
804    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
805    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
806    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
807    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
808    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
809    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
810    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
811    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
812    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
813    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
814    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
815    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
816    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
817    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
818    {"ascent","()F", (void*) SkPaintGlue::ascent},
819    {"descent","()F", (void*) SkPaintGlue::descent},
820    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
821    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
822    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
823    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
824    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
825    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
826    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
827    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
828    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
829    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
830        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
831    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
832        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
833
834
835    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
836        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
837    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
838    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
839        (void*) SkPaintGlue::getTextRunCursor__String},
840    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
841    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
842    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
843                                        (void*) SkPaintGlue::getStringBounds },
844    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
845                                    (void*) SkPaintGlue::getCharArrayBounds },
846    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
847};
848
849static jfieldID req_fieldID(jfieldID id) {
850    SkASSERT(id);
851    return id;
852}
853
854int register_android_graphics_Paint(JNIEnv* env) {
855    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
856    SkASSERT(gFontMetrics_class);
857    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
858
859    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
860    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
861    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
862    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
863    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
864
865    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
866    SkASSERT(gFontMetricsInt_class);
867    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
868
869    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
870    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
871    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
872    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
873    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
874
875    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
876        sizeof(methods) / sizeof(methods[0]));
877    return result;
878}
879
880}
881