Paint.cpp revision 6ab90ed017fb52aac4493a2fac897299d345874f 
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#include "jni.h"
19#include "GraphicsJNI.h"
20#include <android_runtime/AndroidRuntime.h>
21
22#include "SkBlurDrawLooper.h"
23#include "SkColorFilter.h"
24#include "SkMaskFilter.h"
25#include "SkRasterizer.h"
26#include "SkShader.h"
27#include "SkTypeface.h"
28#include "SkXfermode.h"
29#include "unicode/ushape.h"
30#include "TextLayout.h"
31
32// temporary for debugging
33#include <Caches.h>
34#include <utils/Log.h>
35
36namespace android {
37
38struct JMetricsID {
39    jfieldID    top;
40    jfieldID    ascent;
41    jfieldID    descent;
42    jfieldID    bottom;
43    jfieldID    leading;
44};
45
46static jclass   gFontMetrics_class;
47static JMetricsID gFontMetrics_fieldID;
48
49static jclass   gFontMetricsInt_class;
50static JMetricsID gFontMetricsInt_fieldID;
51
52static void defaultSettingsForAndroid(SkPaint* paint) {
53    // looks best we decided
54    paint->setHinting(SkPaint::kSlight_Hinting);
55    // utf16 is required for java
56    paint->setTextEncoding(SkPaint::kUTF16_TextEncoding);
57}
58
59class SkPaintGlue {
60public:
61    enum MoveOpt {
62        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
63    };
64
65    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
66        delete obj;
67    }
68
69    static SkPaint* init(JNIEnv* env, jobject clazz) {
70        SkPaint* obj = new SkPaint();
71        defaultSettingsForAndroid(obj);
72        return obj;
73    }
74
75    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
76        SkPaint* obj = new SkPaint(*paint);
77        return obj;
78    }
79
80    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
81        obj->reset();
82        defaultSettingsForAndroid(obj);
83    }
84
85    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
86        *dst = *src;
87    }
88
89    static jint getFlags(JNIEnv* env, jobject paint) {
90        NPE_CHECK_RETURN_ZERO(env, paint);
91        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
92    }
93
94    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
95        NPE_CHECK_RETURN_VOID(env, paint);
96        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
97    }
98
99    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
100        NPE_CHECK_RETURN_VOID(env, paint);
101        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
102    }
103
104    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
105        NPE_CHECK_RETURN_VOID(env, paint);
106        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
107    }
108
109    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
112    }
113
114    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
115        NPE_CHECK_RETURN_VOID(env, paint);
116        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
117    }
118
119    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
120        NPE_CHECK_RETURN_VOID(env, paint);
121        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
122    }
123
124    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
125        NPE_CHECK_RETURN_VOID(env, paint);
126        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
127    }
128
129    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
130        NPE_CHECK_RETURN_VOID(env, paint);
131        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
132    }
133
134    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
135        NPE_CHECK_RETURN_VOID(env, paint);
136        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
137    }
138
139    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
140        return obj->getStyle();
141    }
142
143    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
144        obj->setStyle(style);
145    }
146
147    static jint getColor(JNIEnv* env, jobject paint) {
148        NPE_CHECK_RETURN_ZERO(env, paint);
149        return GraphicsJNI::getNativePaint(env, paint)->getColor();
150    }
151
152    static jint getAlpha(JNIEnv* env, jobject paint) {
153        NPE_CHECK_RETURN_ZERO(env, paint);
154        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
155    }
156
157    static void setColor(JNIEnv* env, jobject paint, jint color) {
158        NPE_CHECK_RETURN_VOID(env, paint);
159        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
160    }
161
162    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
163        NPE_CHECK_RETURN_VOID(env, paint);
164        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
165    }
166
167    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
168        NPE_CHECK_RETURN_ZERO(env, paint);
169        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
170    }
171
172    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
173        NPE_CHECK_RETURN_VOID(env, paint);
174        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
175    }
176
177    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
178        NPE_CHECK_RETURN_ZERO(env, paint);
179        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
180    }
181
182    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
183        NPE_CHECK_RETURN_VOID(env, paint);
184        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
185    }
186
187    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
188        return obj->getStrokeCap();
189    }
190
191    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
192        obj->setStrokeCap(cap);
193    }
194
195    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
196        return obj->getStrokeJoin();
197    }
198
199    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
200        obj->setStrokeJoin(join);
201    }
202
203    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
204        return obj->getFillPath(*src, dst);
205    }
206
207    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
208        return obj->setShader(shader);
209    }
210
211    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
212        return obj->setColorFilter(filter);
213    }
214
215    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
216        return obj->setXfermode(xfermode);
217    }
218
219    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
220        return obj->setPathEffect(effect);
221    }
222
223    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
224        return obj->setMaskFilter(maskfilter);
225    }
226
227    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
228        return obj->setTypeface(typeface);
229    }
230
231    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
232        return obj->setRasterizer(rasterizer);
233    }
234
235    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
236        return obj->getTextAlign();
237    }
238
239    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
240        obj->setTextAlign(align);
241    }
242
243    static jfloat getTextSize(JNIEnv* env, jobject paint) {
244        NPE_CHECK_RETURN_ZERO(env, paint);
245        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
246    }
247
248    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
249        NPE_CHECK_RETURN_VOID(env, paint);
250        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
251    }
252
253    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
254        NPE_CHECK_RETURN_ZERO(env, paint);
255        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
256    }
257
258    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
259        NPE_CHECK_RETURN_VOID(env, paint);
260        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
261    }
262
263    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
264        NPE_CHECK_RETURN_ZERO(env, paint);
265        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
266    }
267
268    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
269        NPE_CHECK_RETURN_VOID(env, paint);
270        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
271    }
272
273    static jfloat ascent(JNIEnv* env, jobject paint) {
274        NPE_CHECK_RETURN_ZERO(env, paint);
275        SkPaint::FontMetrics    metrics;
276        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
277        return SkScalarToFloat(metrics.fAscent);
278    }
279
280    static jfloat descent(JNIEnv* env, jobject paint) {
281        NPE_CHECK_RETURN_ZERO(env, paint);
282        SkPaint::FontMetrics    metrics;
283        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
284        return SkScalarToFloat(metrics.fDescent);
285    }
286
287    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
288        NPE_CHECK_RETURN_ZERO(env, paint);
289        SkPaint::FontMetrics metrics;
290        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
291
292        if (metricsObj) {
293            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
294            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
295            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
296            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
297            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
298            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
299        }
300        return SkScalarToFloat(spacing);
301    }
302
303    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
304        NPE_CHECK_RETURN_ZERO(env, paint);
305        SkPaint::FontMetrics metrics;
306
307        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
308        int ascent = SkScalarRound(metrics.fAscent);
309        int descent = SkScalarRound(metrics.fDescent);
310        int leading = SkScalarRound(metrics.fLeading);
311
312        if (metricsObj) {
313            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
314            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
315            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
316            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
317            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
318            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
319        }
320        return descent - ascent + leading;
321    }
322
323    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
324        NPE_CHECK_RETURN_ZERO(env, jpaint);
325        NPE_CHECK_RETURN_ZERO(env, text);
326
327        size_t textLength = env->GetArrayLength(text);
328        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
329            doThrowAIOOBE(env);
330            return 0;
331        }
332        if (count == 0) {
333            return 0;
334        }
335
336        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
337        const jchar* textArray = env->GetCharArrayElements(text, NULL);
338        jfloat result = 0;
339#if RTL_USE_HARFBUZZ
340        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
341                paint->getFlags(), NULL /* dont need all advances */, result);
342#else
343        // we double count, since measureText wants a byteLength
344        SkScalar width = paint->measureText(textArray + index, count << 1);
345        result = SkScalarToFloat(width);
346#endif
347        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
348        return result;
349    }
350
351    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
352        NPE_CHECK_RETURN_ZERO(env, jpaint);
353        NPE_CHECK_RETURN_ZERO(env, text);
354
355        int count = end - start;
356        if ((start | count) < 0) {
357            doThrowAIOOBE(env);
358            return 0;
359        }
360        if (count == 0) {
361            return 0;
362        }
363        size_t textLength = env->GetStringLength(text);
364        if ((size_t)count > textLength) {
365            doThrowAIOOBE(env);
366            return 0;
367        }
368
369        const jchar* textArray = env->GetStringChars(text, NULL);
370        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
371        jfloat width = 0;
372
373#if RTL_USE_HARFBUZZ
374        TextLayout::getTextRunAdvances(paint, textArray, start, count, end,
375                paint->getFlags(), NULL /* dont need all advances */, width);
376#else
377
378        width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
379#endif
380        env->ReleaseStringChars(text, textArray);
381        return width;
382    }
383
384    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
385        NPE_CHECK_RETURN_ZERO(env, jpaint);
386        NPE_CHECK_RETURN_ZERO(env, text);
387
388        size_t textLength = env->GetStringLength(text);
389        if (textLength == 0) {
390            return 0;
391        }
392
393        const jchar* textArray = env->GetStringChars(text, NULL);
394        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
395        jfloat width = 0;
396
397#if RTL_USE_HARFBUZZ
398        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
399                paint->getFlags(), NULL /* dont need all advances */, width);
400#else
401        width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
402#endif
403        env->ReleaseStringChars(text, textArray);
404        return width;
405    }
406
407    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
408        NPE_CHECK_RETURN_ZERO(env, paint);
409        NPE_CHECK_RETURN_ZERO(env, text);
410
411        if (count < 0 || !widths) {
412            doThrowAIOOBE(env);
413            return 0;
414        }
415        if (count == 0) {
416            return 0;
417        }
418        size_t widthsLength = env->GetArrayLength(widths);
419        if ((size_t)count > widthsLength) {
420            doThrowAIOOBE(env);
421            return 0;
422        }
423
424        AutoJavaFloatArray autoWidths(env, widths, count);
425        jfloat* widthsArray = autoWidths.ptr();
426
427#if RTL_USE_HARFBUZZ
428        jfloat totalAdvance;
429
430        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
431                paint->getFlags(), widthsArray, totalAdvance);
432#else
433        SkScalar* scalarArray = (SkScalar*)widthsArray;
434
435        count = paint->getTextWidths(text, count << 1, scalarArray);
436        for (int i = 0; i < count; i++) {
437            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
438        }
439#endif
440        return count;
441    }
442
443    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
444        const jchar* textArray = env->GetCharArrayElements(text, NULL);
445        count = dotextwidths(env, paint, textArray + index, count, widths);
446        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
447                                      JNI_ABORT);
448        return count;
449    }
450
451    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
452            int start, int end, jfloatArray widths) {
453        const jchar* textArray = env->GetStringChars(text, NULL);
454        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
455        env->ReleaseStringChars(text, textArray);
456        return count;
457    }
458
459    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
460            jint contextCount, jint flags, jcharArray glyphs) {
461        NPE_CHECK_RETURN_ZERO(env, paint);
462        NPE_CHECK_RETURN_ZERO(env, text);
463
464        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
465            doThrowAIOOBE(env);
466            return 0;
467        }
468        if (count == 0) {
469            return 0;
470        }
471        size_t glypthsLength = env->GetArrayLength(glyphs);
472        if ((size_t)count > glypthsLength) {
473            doThrowAIOOBE(env);
474            return 0;
475        }
476
477        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
478        HB_ShaperItem shaperItem;
479        HB_FontRec font;
480        FontData fontData;
481        TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text,
482                start, count, contextCount, flags);
483
484        int glyphCount = shaperItem.num_glyphs;
485        for (int i = 0; i < glyphCount; i++) {
486            glyphsArray[i] = (jchar) shaperItem.glyphs[i];
487        }
488        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
489        return glyphCount;
490    }
491
492    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
493            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
494            jcharArray glyphs) {
495        const jchar* textArray = env->GetStringChars(text, NULL);
496        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
497                end - start, contextEnd - contextStart, flags, glyphs);
498        env->ReleaseStringChars(text, textArray);
499        return count;
500    }
501
502    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
503                                    jint start, jint count, jint contextCount, jint flags,
504                                    jfloatArray advances, jint advancesIndex) {
505        NPE_CHECK_RETURN_ZERO(env, paint);
506        NPE_CHECK_RETURN_ZERO(env, text);
507
508        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
509            doThrowAIOOBE(env);
510            return 0;
511        }
512        if (count == 0) {
513            return 0;
514        }
515        if (advances) {
516            size_t advancesLength = env->GetArrayLength(advances);
517            if ((size_t)count > advancesLength) {
518                doThrowAIOOBE(env);
519                return 0;
520            }
521        }
522        jfloat advancesArray[count];
523        jfloat totalAdvance = 0;
524
525        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
526                                       advancesArray, totalAdvance);
527
528        if (advances != NULL) {
529            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
530        }
531        return totalAdvance;
532    }
533
534    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
535                                    jint start, jint count, jint contextCount, jint flags,
536                                    jfloatArray advances, jint advancesIndex) {
537        NPE_CHECK_RETURN_ZERO(env, paint);
538        NPE_CHECK_RETURN_ZERO(env, text);
539
540        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
541            doThrowAIOOBE(env);
542            return 0;
543        }
544        if (count == 0) {
545            return 0;
546        }
547        if (advances) {
548            size_t advancesLength = env->GetArrayLength(advances);
549            if ((size_t)count > advancesLength) {
550                doThrowAIOOBE(env);
551                return 0;
552            }
553        }
554
555        jfloat advancesArray[count];
556        jfloat totalAdvance = 0;
557
558        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
559                                       advancesArray, totalAdvance);
560
561        if (advances != NULL) {
562            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
563        }
564        return totalAdvance;
565    }
566
567    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
568            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
569            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
570        jchar* textArray = env->GetCharArrayElements(text, NULL);
571        jfloat result = (reserved == 0) ?
572                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
573                        count, contextCount, flags, advances, advancesIndex) :
574                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
575                        count, contextCount, flags, advances, advancesIndex);
576        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
577        return result;
578    }
579
580    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
581            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
582            jfloatArray advances, jint advancesIndex, jint reserved) {
583        const jchar* textArray = env->GetStringChars(text, NULL);
584        jfloat result = (reserved == 0) ?
585                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
586                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
587                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
588                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
589        env->ReleaseStringChars(text, textArray);
590        return result;
591    }
592
593    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
594            jint count, jint flags, jint offset, jint opt) {
595#if RTL_USE_HARFBUZZ
596        jfloat scalarArray[count];
597        jfloat totalAdvance = 0;
598
599        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
600                scalarArray, totalAdvance);
601#else
602        SkScalar scalarArray[count];
603        jchar buffer[count];
604
605        // this is where we'd call harfbuzz
606        // for now we just use ushape.c and widths returned from skia
607
608        int widths;
609        if (flags & 0x1) { // rtl, call arabic shaping in case
610            UErrorCode status = U_ZERO_ERROR;
611            // Use fixed length since we need to keep start and count valid
612            u_shapeArabic(text + start, count, buffer, count,
613                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
614                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
615            // we shouldn't fail unless there's an out of memory condition,
616            // in which case we're hosed anyway
617            for (int i = 0; i < count; ++i) {
618              if (buffer[i] == 0xffff) {
619                buffer[i] = 0x200b; // zero-width-space for skia
620              }
621            }
622            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
623        } else {
624            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
625        }
626
627        if (widths < count) {
628            // Skia operates on code points, not code units, so surrogate pairs return only one
629            // value. Expand the result so we have one value per UTF-16 code unit.
630
631            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
632            // leaving the remaining widths zero.  Not nice.
633            const jchar *chars = text + start;
634            for (int i = count, p = widths - 1; --i > p;) {
635                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
636                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
637                    scalarArray[i] = 0;
638                } else {
639                  scalarArray[i] = scalarArray[--p];
640                }
641            }
642        }
643#endif
644        jint pos = offset - start;
645        switch (opt) {
646        case AFTER:
647          if (pos < count) {
648            pos += 1;
649          }
650          // fall through
651        case AT_OR_AFTER:
652          while (pos < count && scalarArray[pos] == 0) {
653            ++pos;
654          }
655          break;
656        case BEFORE:
657          if (pos > 0) {
658            --pos;
659          }
660          // fall through
661        case AT_OR_BEFORE:
662          while (pos > 0 && scalarArray[pos] == 0) {
663            --pos;
664          }
665          break;
666        case AT:
667        default:
668          if (scalarArray[pos] == 0) {
669            pos = -1;
670          }
671          break;
672        }
673
674        if (pos != -1) {
675          pos += start;
676        }
677
678        return pos;
679    }
680
681    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
682            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
683        jchar* textArray = env->GetCharArrayElements(text, NULL);
684        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
685                offset, cursorOpt);
686        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
687        return result;
688    }
689
690    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
691            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
692        const jchar* textArray = env->GetStringChars(text, NULL);
693        jint result = doTextRunCursor(env, paint, textArray, contextStart,
694                contextEnd - contextStart, flags, offset, cursorOpt);
695        env->ReleaseStringChars(text, textArray);
696        return result;
697    }
698
699    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
700                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
701        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
702    }
703
704    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
705            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
706        const jchar* textArray = env->GetCharArrayElements(text, NULL);
707        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
708        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
709    }
710
711    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
712            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
713        const jchar* textArray = env->GetStringChars(text, NULL);
714        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
715        env->ReleaseStringChars(text, textArray);
716    }
717
718    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
719                               jfloat dx, jfloat dy, int color) {
720        NPE_CHECK_RETURN_VOID(env, jpaint);
721
722        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
723        if (radius <= 0) {
724            paint->setLooper(NULL);
725        }
726        else {
727            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
728                                                  SkFloatToScalar(dx),
729                                                  SkFloatToScalar(dy),
730                                                  (SkColor)color))->unref();
731        }
732    }
733
734    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
735                         int count, float maxWidth, jfloatArray jmeasured,
736                         SkPaint::TextBufferDirection tbd) {
737        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
738
739        SkScalar     measured;
740        size_t       bytes = paint.breakText(text, count << 1,
741                                   SkFloatToScalar(maxWidth), &measured, tbd);
742        SkASSERT((bytes & 1) == 0);
743
744        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
745            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
746            jfloat* array = autoMeasured.ptr();
747            array[0] = SkScalarToFloat(measured);
748        }
749        return bytes >> 1;
750    }
751
752    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
753            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
754        NPE_CHECK_RETURN_ZERO(env, jpaint);
755        NPE_CHECK_RETURN_ZERO(env, jtext);
756
757        SkPaint::TextBufferDirection tbd;
758        if (count < 0) {
759            tbd = SkPaint::kBackward_TextBufferDirection;
760            count = -count;
761        }
762        else {
763            tbd = SkPaint::kForward_TextBufferDirection;
764        }
765
766        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
767            doThrowAIOOBE(env);
768            return 0;
769        }
770
771        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
772        const jchar* text = env->GetCharArrayElements(jtext, NULL);
773        count = breakText(env, *paint, text + index, count, maxWidth,
774                          jmeasuredWidth, tbd);
775        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
776                                      JNI_ABORT);
777        return count;
778    }
779
780    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
781                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
782        NPE_CHECK_RETURN_ZERO(env, jpaint);
783        NPE_CHECK_RETURN_ZERO(env, jtext);
784
785        SkPaint::TextBufferDirection tbd = forwards ?
786                                        SkPaint::kForward_TextBufferDirection :
787                                        SkPaint::kBackward_TextBufferDirection;
788
789        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
790        int count = env->GetStringLength(jtext);
791        const jchar* text = env->GetStringChars(jtext, NULL);
792        count = breakText(env, *paint, text, count, maxWidth,
793                          jmeasuredWidth, tbd);
794        env->ReleaseStringChars(jtext, text);
795        return count;
796    }
797
798    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
799                             jobject bounds, const SkPaint& paint)
800    {
801        SkRect  r;
802        SkIRect ir;
803
804        paint.measureText(text, count << 1, &r);
805        r.roundOut(&ir);
806        GraphicsJNI::irect_to_jrect(ir, env, bounds);
807    }
808
809    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
810                                jstring text, int start, int end, jobject bounds)
811    {
812        const jchar* textArray = env->GetStringChars(text, NULL);
813        doTextBounds(env, textArray + start, end - start, bounds, *paint);
814        env->ReleaseStringChars(text, textArray);
815    }
816
817    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
818                        jcharArray text, int index, int count, jobject bounds)
819    {
820        const jchar* textArray = env->GetCharArrayElements(text, NULL);
821        doTextBounds(env, textArray + index, count, bounds, *paint);
822        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
823                                      JNI_ABORT);
824    }
825
826};
827
828static JNINativeMethod methods[] = {
829    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
830    {"native_init","()I", (void*) SkPaintGlue::init},
831    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
832    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
833    {"native_set","(II)V", (void*) SkPaintGlue::assign},
834    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
835    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
836    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
837    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
838    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
839    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
840    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
841    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
842    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
843    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
844    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
845    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
846    {"getColor","()I", (void*) SkPaintGlue::getColor},
847    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
848    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
849    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
850    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
851    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
852    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
853    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
854    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
855    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
856    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
857    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
858    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
859    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
860    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
861    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
862    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
863    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
864    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
865    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
866    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
867    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
868    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
869    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
870    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
871    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
872    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
873    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
874    {"ascent","()F", (void*) SkPaintGlue::ascent},
875    {"descent","()F", (void*) SkPaintGlue::descent},
876    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
877    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
878    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
879    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
880    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
881    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
882    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
883    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
884    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
885    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
886        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
887    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
888        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
889
890
891    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
892        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
893    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
894    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
895        (void*) SkPaintGlue::getTextRunCursor__String},
896    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
897    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
898    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
899                                        (void*) SkPaintGlue::getStringBounds },
900    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
901                                    (void*) SkPaintGlue::getCharArrayBounds },
902    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
903};
904
905static jfieldID req_fieldID(jfieldID id) {
906    SkASSERT(id);
907    return id;
908}
909
910int register_android_graphics_Paint(JNIEnv* env) {
911    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
912    SkASSERT(gFontMetrics_class);
913    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
914
915    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
916    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
917    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
918    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
919    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
920
921    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
922    SkASSERT(gFontMetricsInt_class);
923    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
924
925    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
926    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
927    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
928    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
929    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
930
931    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
932        sizeof(methods) / sizeof(methods[0]));
933    return result;
934}
935
936}
937