Paint.cpp revision 6d9fe5bd22b531bfce69b146254a4791c76acddc 
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#include <ScopedUtfChars.h>
26
27#include "SkBlurDrawLooper.h"
28#include "SkColorFilter.h"
29#include "SkMaskFilter.h"
30#include "SkRasterizer.h"
31#include "SkShader.h"
32#include "SkTypeface.h"
33#include "SkXfermode.h"
34#include "unicode/uloc.h"
35#include "unicode/ushape.h"
36#include "TextLayout.h"
37
38// temporary for debugging
39#include <Caches.h>
40#include <utils/Log.h>
41
42namespace android {
43
44struct JMetricsID {
45    jfieldID    top;
46    jfieldID    ascent;
47    jfieldID    descent;
48    jfieldID    bottom;
49    jfieldID    leading;
50};
51
52static jclass   gFontMetrics_class;
53static JMetricsID gFontMetrics_fieldID;
54
55static jclass   gFontMetricsInt_class;
56static JMetricsID gFontMetricsInt_fieldID;
57
58static void defaultSettingsForAndroid(SkPaint* paint) {
59    // GlyphID encoding is required because we are using Harfbuzz shaping
60    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
61}
62
63class SkPaintGlue {
64public:
65    enum MoveOpt {
66        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
67    };
68
69    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
70        delete obj;
71    }
72
73    static SkPaint* init(JNIEnv* env, jobject clazz) {
74        SkPaint* obj = new SkPaint();
75        defaultSettingsForAndroid(obj);
76        return obj;
77    }
78
79    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
80        SkPaint* obj = new SkPaint(*paint);
81        return obj;
82    }
83
84    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
85        obj->reset();
86        defaultSettingsForAndroid(obj);
87    }
88
89    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
90        *dst = *src;
91    }
92
93    static jint getFlags(JNIEnv* env, jobject paint) {
94        NPE_CHECK_RETURN_ZERO(env, paint);
95        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
96    }
97
98    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
99        NPE_CHECK_RETURN_VOID(env, paint);
100        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
101    }
102
103    static jint getHinting(JNIEnv* env, jobject paint) {
104        NPE_CHECK_RETURN_ZERO(env, paint);
105        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
106                == SkPaint::kNo_Hinting ? 0 : 1;
107    }
108
109    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setHinting(
112                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kSlight_Hinting);
113    }
114
115    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
116        NPE_CHECK_RETURN_VOID(env, paint);
117        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
118    }
119
120    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
121        NPE_CHECK_RETURN_VOID(env, paint);
122        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
123    }
124
125    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
126        NPE_CHECK_RETURN_VOID(env, paint);
127        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
128    }
129
130    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
131        NPE_CHECK_RETURN_VOID(env, paint);
132        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
133    }
134
135    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
136        NPE_CHECK_RETURN_VOID(env, paint);
137        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
138    }
139
140    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
141        NPE_CHECK_RETURN_VOID(env, paint);
142        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
143    }
144
145    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
146        NPE_CHECK_RETURN_VOID(env, paint);
147        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
148    }
149
150    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
151        NPE_CHECK_RETURN_VOID(env, paint);
152        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
153    }
154
155    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
156        return obj->getStyle();
157    }
158
159    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
160        obj->setStyle(style);
161    }
162
163    static jint getColor(JNIEnv* env, jobject paint) {
164        NPE_CHECK_RETURN_ZERO(env, paint);
165        return GraphicsJNI::getNativePaint(env, paint)->getColor();
166    }
167
168    static jint getAlpha(JNIEnv* env, jobject paint) {
169        NPE_CHECK_RETURN_ZERO(env, paint);
170        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
171    }
172
173    static void setColor(JNIEnv* env, jobject paint, jint color) {
174        NPE_CHECK_RETURN_VOID(env, paint);
175        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
176    }
177
178    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
179        NPE_CHECK_RETURN_VOID(env, paint);
180        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
181    }
182
183    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
184        NPE_CHECK_RETURN_ZERO(env, paint);
185        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
186    }
187
188    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
189        NPE_CHECK_RETURN_VOID(env, paint);
190        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
191    }
192
193    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
194        NPE_CHECK_RETURN_ZERO(env, paint);
195        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
196    }
197
198    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
199        NPE_CHECK_RETURN_VOID(env, paint);
200        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
201    }
202
203    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
204        return obj->getStrokeCap();
205    }
206
207    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
208        obj->setStrokeCap(cap);
209    }
210
211    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
212        return obj->getStrokeJoin();
213    }
214
215    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
216        obj->setStrokeJoin(join);
217    }
218
219    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
220        return obj->getFillPath(*src, dst);
221    }
222
223    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
224        return obj->setShader(shader);
225    }
226
227    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
228        return obj->setColorFilter(filter);
229    }
230
231    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
232        return obj->setXfermode(xfermode);
233    }
234
235    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
236        return obj->setPathEffect(effect);
237    }
238
239    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
240        return obj->setMaskFilter(maskfilter);
241    }
242
243    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
244        return obj->setTypeface(typeface);
245    }
246
247    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
248        return obj->setRasterizer(rasterizer);
249    }
250
251    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
252        return obj->getTextAlign();
253    }
254
255    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
256        obj->setTextAlign(align);
257    }
258
259    // generate bcp47 identifier for the supplied locale
260    static void toLanguageTag(char* output, size_t outSize,
261            const char* locale) {
262        if (output == NULL || outSize <= 0) {
263            return;
264        }
265        if (locale == NULL) {
266            output[0] = '\0';
267            return;
268        }
269        char canonicalChars[ULOC_FULLNAME_CAPACITY];
270        UErrorCode uErr = U_ZERO_ERROR;
271        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
272                &uErr);
273        if (U_SUCCESS(uErr)) {
274            char likelyChars[ULOC_FULLNAME_CAPACITY];
275            uErr = U_ZERO_ERROR;
276            uloc_addLikelySubtags(canonicalChars, likelyChars,
277                    ULOC_FULLNAME_CAPACITY, &uErr);
278            if (U_SUCCESS(uErr)) {
279                uErr = U_ZERO_ERROR;
280                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
281                if (U_SUCCESS(uErr)) {
282                    return;
283                } else {
284                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
285                            u_errorName(uErr));
286                }
287            } else {
288                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
289                        canonicalChars, u_errorName(uErr));
290            }
291        } else {
292            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
293                    u_errorName(uErr));
294        }
295        // unable to build a proper language identifier
296        output[0] = '\0';
297    }
298
299    static void setTextLocale(JNIEnv* env, jobject clazz, SkPaint* obj, jstring locale) {
300        ScopedUtfChars localeChars(env, locale);
301        char langTag[ULOC_FULLNAME_CAPACITY];
302        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
303        obj->setLanguage(SkLanguage(langTag));
304    }
305
306    static jfloat getTextSize(JNIEnv* env, jobject paint) {
307        NPE_CHECK_RETURN_ZERO(env, paint);
308        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
309    }
310
311    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
312        NPE_CHECK_RETURN_VOID(env, paint);
313        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
314    }
315
316    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
317        NPE_CHECK_RETURN_ZERO(env, paint);
318        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
319    }
320
321    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
322        NPE_CHECK_RETURN_VOID(env, paint);
323        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
324    }
325
326    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
327        NPE_CHECK_RETURN_ZERO(env, paint);
328        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
329    }
330
331    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
332        NPE_CHECK_RETURN_VOID(env, paint);
333        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
334    }
335
336    static jfloat ascent(JNIEnv* env, jobject paint) {
337        NPE_CHECK_RETURN_ZERO(env, paint);
338        SkPaint::FontMetrics    metrics;
339        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
340        return SkScalarToFloat(metrics.fAscent);
341    }
342
343    static jfloat descent(JNIEnv* env, jobject paint) {
344        NPE_CHECK_RETURN_ZERO(env, paint);
345        SkPaint::FontMetrics    metrics;
346        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
347        return SkScalarToFloat(metrics.fDescent);
348    }
349
350    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
351        NPE_CHECK_RETURN_ZERO(env, paint);
352        SkPaint::FontMetrics metrics;
353        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
354
355        if (metricsObj) {
356            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
357            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
358            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
359            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
360            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
361            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
362        }
363        return SkScalarToFloat(spacing);
364    }
365
366    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
367        NPE_CHECK_RETURN_ZERO(env, paint);
368        SkPaint::FontMetrics metrics;
369
370        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
371        int ascent = SkScalarRound(metrics.fAscent);
372        int descent = SkScalarRound(metrics.fDescent);
373        int leading = SkScalarRound(metrics.fLeading);
374
375        if (metricsObj) {
376            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
377            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
378            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
379            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
380            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
381            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
382        }
383        return descent - ascent + leading;
384    }
385
386    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
387        NPE_CHECK_RETURN_ZERO(env, jpaint);
388        NPE_CHECK_RETURN_ZERO(env, text);
389
390        size_t textLength = env->GetArrayLength(text);
391        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
392            doThrowAIOOBE(env);
393            return 0;
394        }
395        if (count == 0) {
396            return 0;
397        }
398
399        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
400        const jchar* textArray = env->GetCharArrayElements(text, NULL);
401        jfloat result = 0;
402
403        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
404                NULL /* dont need all advances */, &result);
405
406        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
407        return result;
408    }
409
410    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
411        NPE_CHECK_RETURN_ZERO(env, jpaint);
412        NPE_CHECK_RETURN_ZERO(env, text);
413
414        size_t textLength = env->GetStringLength(text);
415        int count = end - start;
416        if ((start | count) < 0 || (size_t)end > textLength) {
417            doThrowAIOOBE(env);
418            return 0;
419        }
420        if (count == 0) {
421            return 0;
422        }
423
424        const jchar* textArray = env->GetStringChars(text, NULL);
425        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
426        jfloat width = 0;
427
428        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
429                NULL /* dont need all advances */, &width);
430
431        env->ReleaseStringChars(text, textArray);
432        return width;
433    }
434
435    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
436        NPE_CHECK_RETURN_ZERO(env, jpaint);
437        NPE_CHECK_RETURN_ZERO(env, text);
438
439        size_t textLength = env->GetStringLength(text);
440        if (textLength == 0) {
441            return 0;
442        }
443
444        const jchar* textArray = env->GetStringChars(text, NULL);
445        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
446        jfloat width = 0;
447
448        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
449                NULL /* dont need all advances */, &width);
450
451        env->ReleaseStringChars(text, textArray);
452        return width;
453    }
454
455    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
456        NPE_CHECK_RETURN_ZERO(env, paint);
457        NPE_CHECK_RETURN_ZERO(env, text);
458
459        if (count < 0 || !widths) {
460            doThrowAIOOBE(env);
461            return 0;
462        }
463        if (count == 0) {
464            return 0;
465        }
466        size_t widthsLength = env->GetArrayLength(widths);
467        if ((size_t)count > widthsLength) {
468            doThrowAIOOBE(env);
469            return 0;
470        }
471
472        AutoJavaFloatArray autoWidths(env, widths, count);
473        jfloat* widthsArray = autoWidths.ptr();
474
475        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
476                widthsArray, NULL /* dont need totalAdvance */);
477
478        return count;
479    }
480
481    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
482        const jchar* textArray = env->GetCharArrayElements(text, NULL);
483        count = dotextwidths(env, paint, textArray + index, count, widths);
484        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
485                                      JNI_ABORT);
486        return count;
487    }
488
489    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
490            int start, int end, jfloatArray widths) {
491        const jchar* textArray = env->GetStringChars(text, NULL);
492        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
493        env->ReleaseStringChars(text, textArray);
494        return count;
495    }
496
497    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
498                                    jint start, jint count, jint contextCount,
499                                    jfloatArray advances, jint advancesIndex) {
500        NPE_CHECK_RETURN_ZERO(env, paint);
501        NPE_CHECK_RETURN_ZERO(env, text);
502
503        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
504            doThrowAIOOBE(env);
505            return 0;
506        }
507        if (count == 0) {
508            return 0;
509        }
510        if (advances) {
511            size_t advancesLength = env->GetArrayLength(advances);
512            if ((size_t)count > advancesLength) {
513                doThrowAIOOBE(env);
514                return 0;
515            }
516        }
517        jfloat advancesArray[count];
518        jfloat totalAdvance = 0;
519
520        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount,
521                                       advancesArray, &totalAdvance);
522
523        if (advances != NULL) {
524            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
525        }
526        return totalAdvance;
527    }
528
529    static float getTextRunAdvances___CIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
530            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
531            jfloatArray advances, jint advancesIndex) {
532        jchar* textArray = env->GetCharArrayElements(text, NULL);
533        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
534                index - contextIndex, count, contextCount, advances, advancesIndex);
535        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
536        return result;
537    }
538
539    static float getTextRunAdvances__StringIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
540            jstring text, jint start, jint end, jint contextStart, jint contextEnd,
541            jfloatArray advances, jint advancesIndex) {
542        const jchar* textArray = env->GetStringChars(text, NULL);
543        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
544                start - contextStart, end - start, contextEnd - contextStart,
545                advances, advancesIndex);
546        env->ReleaseStringChars(text, textArray);
547        return result;
548    }
549
550    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
551            jint count, jint flags, jint offset, jint opt) {
552        jfloat scalarArray[count];
553
554        TextLayout::getTextRunAdvances(paint, text, start, count, start + count,
555                scalarArray, NULL /* dont need totalAdvance */);
556
557        jint pos = offset - start;
558        switch (opt) {
559        case AFTER:
560          if (pos < count) {
561            pos += 1;
562          }
563          // fall through
564        case AT_OR_AFTER:
565          while (pos < count && scalarArray[pos] == 0) {
566            ++pos;
567          }
568          break;
569        case BEFORE:
570          if (pos > 0) {
571            --pos;
572          }
573          // fall through
574        case AT_OR_BEFORE:
575          while (pos > 0 && scalarArray[pos] == 0) {
576            --pos;
577          }
578          break;
579        case AT:
580        default:
581          if (scalarArray[pos] == 0) {
582            pos = -1;
583          }
584          break;
585        }
586
587        if (pos != -1) {
588          pos += start;
589        }
590
591        return pos;
592    }
593
594    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
595            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
596        jchar* textArray = env->GetCharArrayElements(text, NULL);
597        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
598                offset, cursorOpt);
599        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
600        return result;
601    }
602
603    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
604            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
605        const jchar* textArray = env->GetStringChars(text, NULL);
606        jint result = doTextRunCursor(env, paint, textArray, contextStart,
607                contextEnd - contextStart, flags, offset, cursorOpt);
608        env->ReleaseStringChars(text, textArray);
609        return result;
610    }
611
612    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
613                            jfloat x, jfloat y, SkPath *path) {
614        TextLayout::getTextPath(paint, text, count, x, y, path);
615    }
616
617    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint,
618            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
619        const jchar* textArray = env->GetCharArrayElements(text, NULL);
620        getTextPath(env, paint, textArray + index, count, x, y, path);
621        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
622    }
623
624    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint,
625            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
626        const jchar* textArray = env->GetStringChars(text, NULL);
627        getTextPath(env, paint, textArray + start, end - start, x, y, path);
628        env->ReleaseStringChars(text, textArray);
629    }
630
631    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
632                               jfloat dx, jfloat dy, int color) {
633        NPE_CHECK_RETURN_VOID(env, jpaint);
634
635        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
636        if (radius <= 0) {
637            paint->setLooper(NULL);
638        }
639        else {
640            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
641                                                  SkFloatToScalar(dx),
642                                                  SkFloatToScalar(dy),
643                                                  (SkColor)color))->unref();
644        }
645    }
646
647    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
648                         int count, float maxWidth, jfloatArray jmeasured,
649                         SkPaint::TextBufferDirection tbd) {
650        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
651                text, 0, count, count);
652        if (value == NULL) {
653            return 0;
654        }
655        SkScalar     measured;
656        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
657                                   SkFloatToScalar(maxWidth), &measured, tbd);
658        SkASSERT((bytes & 1) == 0);
659
660        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
661            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
662            jfloat* array = autoMeasured.ptr();
663            array[0] = SkScalarToFloat(measured);
664        }
665        return bytes >> 1;
666    }
667
668    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
669            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
670        NPE_CHECK_RETURN_ZERO(env, jpaint);
671        NPE_CHECK_RETURN_ZERO(env, jtext);
672
673        SkPaint::TextBufferDirection tbd;
674        if (count < 0) {
675            tbd = SkPaint::kBackward_TextBufferDirection;
676            count = -count;
677        }
678        else {
679            tbd = SkPaint::kForward_TextBufferDirection;
680        }
681
682        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
683            doThrowAIOOBE(env);
684            return 0;
685        }
686
687        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
688        const jchar* text = env->GetCharArrayElements(jtext, NULL);
689        count = breakText(env, *paint, text + index, count, maxWidth,
690                          jmeasuredWidth, tbd);
691        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
692                                      JNI_ABORT);
693        return count;
694    }
695
696    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
697                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
698        NPE_CHECK_RETURN_ZERO(env, jpaint);
699        NPE_CHECK_RETURN_ZERO(env, jtext);
700
701        SkPaint::TextBufferDirection tbd = forwards ?
702                                        SkPaint::kForward_TextBufferDirection :
703                                        SkPaint::kBackward_TextBufferDirection;
704
705        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
706        int count = env->GetStringLength(jtext);
707        const jchar* text = env->GetStringChars(jtext, NULL);
708        count = breakText(env, *paint, text, count, maxWidth,
709                          jmeasuredWidth, tbd);
710        env->ReleaseStringChars(jtext, text);
711        return count;
712    }
713
714    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
715                             jobject bounds, const SkPaint& paint)
716    {
717        SkRect  r;
718        r.set(0,0,0,0);
719
720        SkIRect ir;
721
722        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
723                text, 0, count, count);
724        if (value == NULL) {
725            return;
726        }
727        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
728        r.roundOut(&ir);
729        GraphicsJNI::irect_to_jrect(ir, env, bounds);
730    }
731
732    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
733                                jstring text, int start, int end, jobject bounds)
734    {
735        const jchar* textArray = env->GetStringChars(text, NULL);
736        doTextBounds(env, textArray + start, end - start, bounds, *paint);
737        env->ReleaseStringChars(text, textArray);
738    }
739
740    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
741                        jcharArray text, int index, int count, jobject bounds)
742    {
743        const jchar* textArray = env->GetCharArrayElements(text, NULL);
744        doTextBounds(env, textArray + index, count, bounds, *paint);
745        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
746                                      JNI_ABORT);
747    }
748
749};
750
751static JNINativeMethod methods[] = {
752    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
753    {"native_init","()I", (void*) SkPaintGlue::init},
754    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
755    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
756    {"native_set","(II)V", (void*) SkPaintGlue::assign},
757    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
758    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
759    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
760    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
761    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
762    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
763    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
764    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
765    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
766    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
767    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
768    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
769    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
770    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
771    {"getColor","()I", (void*) SkPaintGlue::getColor},
772    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
773    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
774    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
775    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
776    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
777    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
778    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
779    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
780    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
781    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
782    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
783    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
784    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
785    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
786    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
787    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
788    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
789    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
790    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
791    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
792    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
793    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
794    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
795    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
796    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
797    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
798    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
799    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
800    {"ascent","()F", (void*) SkPaintGlue::ascent},
801    {"descent","()F", (void*) SkPaintGlue::descent},
802    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
803    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
804    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
805    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
806    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
807    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
808    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
809    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
810    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
811    {"native_getTextRunAdvances","(I[CIIII[FI)F",
812        (void*) SkPaintGlue::getTextRunAdvances___CIIII_FI},
813    {"native_getTextRunAdvances","(ILjava/lang/String;IIII[FI)F",
814        (void*) SkPaintGlue::getTextRunAdvances__StringIIII_FI},
815    {"native_getTextRunCursor", "(I[CIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
816    {"native_getTextRunCursor", "(ILjava/lang/String;IIII)I",
817        (void*) SkPaintGlue::getTextRunCursor__String},
818    {"native_getTextPath","(I[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
819    {"native_getTextPath","(ILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
820    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
821                                        (void*) SkPaintGlue::getStringBounds },
822    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
823                                    (void*) SkPaintGlue::getCharArrayBounds },
824    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
825};
826
827static jfieldID req_fieldID(jfieldID id) {
828    SkASSERT(id);
829    return id;
830}
831
832int register_android_graphics_Paint(JNIEnv* env) {
833    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
834    SkASSERT(gFontMetrics_class);
835    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
836
837    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
838    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
839    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
840    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
841    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
842
843    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
844    SkASSERT(gFontMetricsInt_class);
845    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
846
847    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
848    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
849    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
850    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
851    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
852
853    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
854        sizeof(methods) / sizeof(methods[0]));
855    return result;
856}
857
858}
859