Paint.cpp revision 53c0077256afebb0312f01ef4f60a7445da1f5d9 
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    SkPaintOptionsAndroid paintOpts = paint->getPaintOptionsAndroid();
63    paintOpts.setUseFontFallbacks(true);
64    paint->setPaintOptionsAndroid(paintOpts);
65}
66
67class SkPaintGlue {
68public:
69    enum MoveOpt {
70        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
71    };
72
73    static void finalizer(JNIEnv* env, jobject clazz, jlong objHandle) {
74        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
75        delete obj;
76    }
77
78    static jlong init(JNIEnv* env, jobject clazz) {
79        SkPaint* obj = new SkPaint();
80        defaultSettingsForAndroid(obj);
81        return reinterpret_cast<jlong>(obj);
82    }
83
84    static jlong initWithPaint(JNIEnv* env, jobject clazz, jlong paintHandle) {
85        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
86        SkPaint* obj = new SkPaint(*paint);
87        return reinterpret_cast<jlong>(obj);
88    }
89
90    static void reset(JNIEnv* env, jobject clazz, jlong objHandle) {
91        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
92        obj->reset();
93        defaultSettingsForAndroid(obj);
94    }
95
96    static void assign(JNIEnv* env, jobject clazz, jlong dstPaintHandle, jlong srcPaintHandle) {
97        SkPaint* dst = reinterpret_cast<SkPaint*>(dstPaintHandle);
98        const SkPaint* src = reinterpret_cast<SkPaint*>(srcPaintHandle);
99        *dst = *src;
100    }
101
102    static jint getFlags(JNIEnv* env, jobject paint) {
103        NPE_CHECK_RETURN_ZERO(env, paint);
104        int result;
105        result = GraphicsJNI::getNativePaint(env, paint)->getFlags();
106        return static_cast<jint>(result);
107    }
108
109    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
112    }
113
114    static jint getHinting(JNIEnv* env, jobject paint) {
115        NPE_CHECK_RETURN_ZERO(env, paint);
116        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
117                == SkPaint::kNo_Hinting ? 0 : 1;
118    }
119
120    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
121        NPE_CHECK_RETURN_VOID(env, paint);
122        GraphicsJNI::getNativePaint(env, paint)->setHinting(
123                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kNormal_Hinting);
124    }
125
126    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
127        NPE_CHECK_RETURN_VOID(env, paint);
128        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
129    }
130
131    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
132        NPE_CHECK_RETURN_VOID(env, paint);
133        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
134    }
135
136    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
137        NPE_CHECK_RETURN_VOID(env, paint);
138        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
139    }
140
141    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
142        NPE_CHECK_RETURN_VOID(env, paint);
143        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
144    }
145
146    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
147        NPE_CHECK_RETURN_VOID(env, paint);
148        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
149    }
150
151    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
152        NPE_CHECK_RETURN_VOID(env, paint);
153        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
154    }
155
156    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
157        NPE_CHECK_RETURN_VOID(env, paint);
158        GraphicsJNI::getNativePaint(env, paint)->setFilterLevel(
159                filterBitmap ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
160    }
161
162    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
163        NPE_CHECK_RETURN_VOID(env, paint);
164        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
165    }
166
167    static jint getStyle(JNIEnv* env, jobject clazz,jlong objHandle) {
168        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
169        return static_cast<jint>(obj->getStyle());
170    }
171
172    static void setStyle(JNIEnv* env, jobject clazz, jlong objHandle, jint styleHandle) {
173        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
174        SkPaint::Style style = static_cast<SkPaint::Style>(styleHandle);
175        obj->setStyle(style);
176    }
177
178    static jint getColor(JNIEnv* env, jobject paint) {
179        NPE_CHECK_RETURN_ZERO(env, paint);
180        int color;
181        color = GraphicsJNI::getNativePaint(env, paint)->getColor();
182        return static_cast<jint>(color);
183    }
184
185    static jint getAlpha(JNIEnv* env, jobject paint) {
186        NPE_CHECK_RETURN_ZERO(env, paint);
187        int alpha;
188        alpha = GraphicsJNI::getNativePaint(env, paint)->getAlpha();
189        return static_cast<jint>(alpha);
190    }
191
192    static void setColor(JNIEnv* env, jobject paint, jint color) {
193        NPE_CHECK_RETURN_VOID(env, paint);
194        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
195    }
196
197    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
198        NPE_CHECK_RETURN_VOID(env, paint);
199        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
200    }
201
202    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
203        NPE_CHECK_RETURN_ZERO(env, paint);
204        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
205    }
206
207    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
208        NPE_CHECK_RETURN_VOID(env, paint);
209        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(width);
210    }
211
212    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
213        NPE_CHECK_RETURN_ZERO(env, paint);
214        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
215    }
216
217    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
218        NPE_CHECK_RETURN_VOID(env, paint);
219        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(miter);
220    }
221
222    static jint getStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle) {
223        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
224        return static_cast<jint>(obj->getStrokeCap());
225    }
226
227    static void setStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle, jint capHandle) {
228        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
229        SkPaint::Cap cap = static_cast<SkPaint::Cap>(capHandle);
230        obj->setStrokeCap(cap);
231    }
232
233    static jint getStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle) {
234        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
235        return static_cast<jint>(obj->getStrokeJoin());
236    }
237
238    static void setStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle, jint joinHandle) {
239        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
240        SkPaint::Join join = (SkPaint::Join) joinHandle;
241        obj->setStrokeJoin(join);
242    }
243
244    static jboolean getFillPath(JNIEnv* env, jobject clazz, jlong objHandle, jlong srcHandle, jlong dstHandle) {
245        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
246        SkPath* src = reinterpret_cast<SkPath*>(srcHandle);
247        SkPath* dst = reinterpret_cast<SkPath*>(dstHandle);
248        return obj->getFillPath(*src, dst) ? JNI_TRUE : JNI_FALSE;
249    }
250
251    static jlong setShader(JNIEnv* env, jobject clazz, jlong objHandle, jlong shaderHandle) {
252        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
253        SkShader* shader = reinterpret_cast<SkShader*>(shaderHandle);
254        return reinterpret_cast<jlong>(obj->setShader(shader));
255    }
256
257    static jlong setColorFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong filterHandle) {
258        SkPaint* obj = reinterpret_cast<SkPaint *>(objHandle);
259        SkColorFilter* filter  = reinterpret_cast<SkColorFilter *>(filterHandle);
260        return reinterpret_cast<jlong>(obj->setColorFilter(filter));
261    }
262
263    static jlong setXfermode(JNIEnv* env, jobject clazz, jlong objHandle, jlong xfermodeHandle) {
264        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
265        SkXfermode* xfermode = reinterpret_cast<SkXfermode*>(xfermodeHandle);
266        return reinterpret_cast<jlong>(obj->setXfermode(xfermode));
267    }
268
269    static jlong setPathEffect(JNIEnv* env, jobject clazz, jlong objHandle, jlong effectHandle) {
270        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
271        SkPathEffect* effect  = reinterpret_cast<SkPathEffect*>(effectHandle);
272        return reinterpret_cast<jlong>(obj->setPathEffect(effect));
273    }
274
275    static jlong setMaskFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong maskfilterHandle) {
276        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
277        SkMaskFilter* maskfilter  = reinterpret_cast<SkMaskFilter*>(maskfilterHandle);
278        return reinterpret_cast<jlong>(obj->setMaskFilter(maskfilter));
279    }
280
281    static jlong setTypeface(JNIEnv* env, jobject clazz, jlong objHandle, jlong typefaceHandle) {
282#ifndef USE_MINIKIN
283        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
284        SkTypeface* typeface = reinterpret_cast<SkTypeface*>(typefaceHandle);
285        return reinterpret_cast<jlong>(obj->setTypeface(typeface));
286#else
287        // TODO(raph): not yet implemented
288        return NULL;
289#endif
290    }
291
292    static jlong setRasterizer(JNIEnv* env, jobject clazz, jlong objHandle, jlong rasterizerHandle) {
293        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
294        SkRasterizer* rasterizer = reinterpret_cast<SkRasterizer*>(rasterizerHandle);
295        return reinterpret_cast<jlong>(obj->setRasterizer(rasterizer));
296    }
297
298    static jint getTextAlign(JNIEnv* env, jobject clazz, jlong objHandle) {
299        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
300        return static_cast<jint>(obj->getTextAlign());
301    }
302
303    static void setTextAlign(JNIEnv* env, jobject clazz, jlong objHandle, jint alignHandle) {
304        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
305        SkPaint::Align align = static_cast<SkPaint::Align>(alignHandle);
306        obj->setTextAlign(align);
307    }
308
309    // generate bcp47 identifier for the supplied locale
310    static void toLanguageTag(char* output, size_t outSize,
311            const char* locale) {
312        if (output == NULL || outSize <= 0) {
313            return;
314        }
315        if (locale == NULL) {
316            output[0] = '\0';
317            return;
318        }
319        char canonicalChars[ULOC_FULLNAME_CAPACITY];
320        UErrorCode uErr = U_ZERO_ERROR;
321        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
322                &uErr);
323        if (U_SUCCESS(uErr)) {
324            char likelyChars[ULOC_FULLNAME_CAPACITY];
325            uErr = U_ZERO_ERROR;
326            uloc_addLikelySubtags(canonicalChars, likelyChars,
327                    ULOC_FULLNAME_CAPACITY, &uErr);
328            if (U_SUCCESS(uErr)) {
329                uErr = U_ZERO_ERROR;
330                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
331                if (U_SUCCESS(uErr)) {
332                    return;
333                } else {
334                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
335                            u_errorName(uErr));
336                }
337            } else {
338                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
339                        canonicalChars, u_errorName(uErr));
340            }
341        } else {
342            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
343                    u_errorName(uErr));
344        }
345        // unable to build a proper language identifier
346        output[0] = '\0';
347    }
348
349    static void setTextLocale(JNIEnv* env, jobject clazz, jlong objHandle, jstring locale) {
350        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
351        ScopedUtfChars localeChars(env, locale);
352        char langTag[ULOC_FULLNAME_CAPACITY];
353        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
354
355        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
356        paintOpts.setLanguage(langTag);
357        obj->setPaintOptionsAndroid(paintOpts);
358    }
359
360    static jboolean isElegantTextHeight(JNIEnv* env, jobject paint) {
361        NPE_CHECK_RETURN_ZERO(env, paint);
362        SkPaint* obj = GraphicsJNI::getNativePaint(env, paint);
363        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
364        return paintOpts.getFontVariant() == SkPaintOptionsAndroid::kElegant_Variant;
365    }
366
367    static void setElegantTextHeight(JNIEnv* env, jobject paint, jboolean aa) {
368        NPE_CHECK_RETURN_VOID(env, paint);
369        SkPaint* obj = GraphicsJNI::getNativePaint(env, paint);
370        SkPaintOptionsAndroid::FontVariant variant =
371            aa ? SkPaintOptionsAndroid::kElegant_Variant :
372            SkPaintOptionsAndroid::kDefault_Variant;
373        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
374        paintOpts.setFontVariant(variant);
375        obj->setPaintOptionsAndroid(paintOpts);
376    }
377
378    static jfloat getTextSize(JNIEnv* env, jobject paint) {
379        NPE_CHECK_RETURN_ZERO(env, paint);
380        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
381    }
382
383    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
384        NPE_CHECK_RETURN_VOID(env, paint);
385        GraphicsJNI::getNativePaint(env, paint)->setTextSize(textSize);
386    }
387
388    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
389        NPE_CHECK_RETURN_ZERO(env, paint);
390        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
391    }
392
393    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
394        NPE_CHECK_RETURN_VOID(env, paint);
395        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(scaleX);
396    }
397
398    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
399        NPE_CHECK_RETURN_ZERO(env, paint);
400        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
401    }
402
403    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
404        NPE_CHECK_RETURN_VOID(env, paint);
405        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(skewX);
406    }
407
408    static jfloat ascent(JNIEnv* env, jobject paint) {
409        NPE_CHECK_RETURN_ZERO(env, paint);
410        SkPaint::FontMetrics    metrics;
411        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
412        return SkScalarToFloat(metrics.fAscent);
413    }
414
415    static jfloat descent(JNIEnv* env, jobject paint) {
416        NPE_CHECK_RETURN_ZERO(env, paint);
417        SkPaint::FontMetrics    metrics;
418        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
419        return SkScalarToFloat(metrics.fDescent);
420    }
421
422    static SkScalar getMetricsInternal(SkPaint *paint, SkPaint::FontMetrics *metrics) {
423        const int kElegantTop = 2500;
424        const int kElegantBottom = -1000;
425        const int kElegantAscent = 1946;
426        const int kElegantDescent = -512;
427        const int kElegantLeading = 0;
428        SkScalar spacing = paint->getFontMetrics(metrics);
429        SkPaintOptionsAndroid paintOpts = paint->getPaintOptionsAndroid();
430        if (paintOpts.getFontVariant() == SkPaintOptionsAndroid::kElegant_Variant) {
431            SkScalar size = paint->getTextSize();
432            metrics->fTop = -size * kElegantTop / 2048;
433            metrics->fBottom = -size * kElegantBottom / 2048;
434            metrics->fAscent = -size * kElegantAscent / 2048;
435            metrics->fDescent = -size * kElegantDescent / 2048;
436            metrics->fLeading = size * kElegantLeading / 2048;
437            spacing = metrics->fDescent - metrics->fAscent + metrics->fLeading;
438        }
439        return spacing;
440    }
441
442    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
443        NPE_CHECK_RETURN_ZERO(env, paint);
444        SkPaint::FontMetrics metrics;
445        SkScalar spacing = getMetricsInternal(GraphicsJNI::getNativePaint(env, paint), &metrics);
446
447        if (metricsObj) {
448            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
449            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
450            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
451            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
452            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
453            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
454        }
455        return SkScalarToFloat(spacing);
456    }
457
458    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
459        NPE_CHECK_RETURN_ZERO(env, paint);
460        SkPaint::FontMetrics metrics;
461
462        getMetricsInternal(GraphicsJNI::getNativePaint(env, paint), &metrics);
463        int ascent = SkScalarRoundToInt(metrics.fAscent);
464        int descent = SkScalarRoundToInt(metrics.fDescent);
465        int leading = SkScalarRoundToInt(metrics.fLeading);
466
467        if (metricsObj) {
468            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
469            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloorToInt(metrics.fTop));
470            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
471            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
472            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeilToInt(metrics.fBottom));
473            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
474        }
475        return descent - ascent + leading;
476    }
477
478    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, jint index, jint count,
479            jint bidiFlags) {
480        NPE_CHECK_RETURN_ZERO(env, jpaint);
481        NPE_CHECK_RETURN_ZERO(env, text);
482
483        size_t textLength = env->GetArrayLength(text);
484        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
485            doThrowAIOOBE(env);
486            return 0;
487        }
488        if (count == 0) {
489            return 0;
490        }
491
492        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
493        const jchar* textArray = env->GetCharArrayElements(text, NULL);
494        jfloat result = 0;
495
496        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
497                bidiFlags, NULL /* dont need all advances */, &result);
498
499        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
500        return result;
501    }
502
503    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, jint start, jint end,
504            jint bidiFlags) {
505        NPE_CHECK_RETURN_ZERO(env, jpaint);
506        NPE_CHECK_RETURN_ZERO(env, text);
507
508        size_t textLength = env->GetStringLength(text);
509        int count = end - start;
510        if ((start | count) < 0 || (size_t)end > textLength) {
511            doThrowAIOOBE(env);
512            return 0;
513        }
514        if (count == 0) {
515            return 0;
516        }
517
518        const jchar* textArray = env->GetStringChars(text, NULL);
519        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
520        jfloat width = 0;
521
522        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
523                bidiFlags, NULL /* dont need all advances */, &width);
524
525        env->ReleaseStringChars(text, textArray);
526        return width;
527    }
528
529    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
530        NPE_CHECK_RETURN_ZERO(env, jpaint);
531        NPE_CHECK_RETURN_ZERO(env, text);
532
533        size_t textLength = env->GetStringLength(text);
534        if (textLength == 0) {
535            return 0;
536        }
537
538        const jchar* textArray = env->GetStringChars(text, NULL);
539        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
540        jfloat width = 0;
541
542        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
543                bidiFlags, NULL /* dont need all advances */, &width);
544
545        env->ReleaseStringChars(text, textArray);
546        return width;
547    }
548
549    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
550            jint bidiFlags) {
551        NPE_CHECK_RETURN_ZERO(env, paint);
552        NPE_CHECK_RETURN_ZERO(env, text);
553
554        if (count < 0 || !widths) {
555            doThrowAIOOBE(env);
556            return 0;
557        }
558        if (count == 0) {
559            return 0;
560        }
561        size_t widthsLength = env->GetArrayLength(widths);
562        if ((size_t)count > widthsLength) {
563            doThrowAIOOBE(env);
564            return 0;
565        }
566
567        AutoJavaFloatArray autoWidths(env, widths, count);
568        jfloat* widthsArray = autoWidths.ptr();
569
570        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
571                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
572
573        return count;
574    }
575
576    static jint getTextWidths___CIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
577            jint index, jint count, jint bidiFlags, jfloatArray widths) {
578        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
579        const jchar* textArray = env->GetCharArrayElements(text, NULL);
580        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
581        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
582                                      JNI_ABORT);
583        return count;
584    }
585
586    static jint getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
587            jint start, jint end, jint bidiFlags, jfloatArray widths) {
588        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
589        const jchar* textArray = env->GetStringChars(text, NULL);
590        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
591        env->ReleaseStringChars(text, textArray);
592        return count;
593    }
594
595    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
596            jint contextCount, jint flags, jcharArray glyphs) {
597        NPE_CHECK_RETURN_ZERO(env, paint);
598        NPE_CHECK_RETURN_ZERO(env, text);
599
600        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
601            doThrowAIOOBE(env);
602            return 0;
603        }
604        if (count == 0) {
605            return 0;
606        }
607        size_t glypthsLength = env->GetArrayLength(glyphs);
608        if ((size_t)count > glypthsLength) {
609            doThrowAIOOBE(env);
610            return 0;
611        }
612
613        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
614
615        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
616                text, start, count, contextCount, flags);
617        const jchar* shapedGlyphs = value->getGlyphs();
618        size_t glyphsCount = value->getGlyphsCount();
619        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
620
621        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
622        return glyphsCount;
623    }
624
625    static jint getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, jlong paintHandle,
626            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
627            jcharArray glyphs) {
628        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
629        const jchar* textArray = env->GetStringChars(text, NULL);
630        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
631                end - start, contextEnd - contextStart, flags, glyphs);
632        env->ReleaseStringChars(text, textArray);
633        return count;
634    }
635
636    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
637                                    jint start, jint count, jint contextCount, jint flags,
638                                    jfloatArray advances, jint advancesIndex) {
639        NPE_CHECK_RETURN_ZERO(env, paint);
640        NPE_CHECK_RETURN_ZERO(env, text);
641
642        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
643            doThrowAIOOBE(env);
644            return 0;
645        }
646        if (count == 0) {
647            return 0;
648        }
649        if (advances) {
650            size_t advancesLength = env->GetArrayLength(advances);
651            if ((size_t)count > advancesLength) {
652                doThrowAIOOBE(env);
653                return 0;
654            }
655        }
656        jfloat* advancesArray = new jfloat[count];
657        jfloat totalAdvance = 0;
658
659        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
660                                       advancesArray, &totalAdvance);
661
662        if (advances != NULL) {
663            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
664        }
665        delete [] advancesArray;
666        return totalAdvance;
667    }
668
669    static jfloat getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
670            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
671            jint flags, jfloatArray advances, jint advancesIndex) {
672        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
673        jchar* textArray = env->GetCharArrayElements(text, NULL);
674        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
675                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
676        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
677        return result;
678    }
679
680    static jfloat getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
681            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
682            jfloatArray advances, jint advancesIndex) {
683        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
684        const jchar* textArray = env->GetStringChars(text, NULL);
685        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
686                start - contextStart, end - start, contextEnd - contextStart, flags,
687                advances, advancesIndex);
688        env->ReleaseStringChars(text, textArray);
689        return result;
690    }
691
692    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
693            jint count, jint flags, jint offset, jint opt) {
694        jfloat scalarArray[count];
695
696        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
697                scalarArray, NULL /* dont need totalAdvance */);
698
699        jint pos = offset - start;
700        switch (opt) {
701        case AFTER:
702          if (pos < count) {
703            pos += 1;
704          }
705          // fall through
706        case AT_OR_AFTER:
707          while (pos < count && scalarArray[pos] == 0) {
708            ++pos;
709          }
710          break;
711        case BEFORE:
712          if (pos > 0) {
713            --pos;
714          }
715          // fall through
716        case AT_OR_BEFORE:
717          while (pos > 0 && scalarArray[pos] == 0) {
718            --pos;
719          }
720          break;
721        case AT:
722        default:
723          if (scalarArray[pos] == 0) {
724            pos = -1;
725          }
726          break;
727        }
728
729        if (pos != -1) {
730          pos += start;
731        }
732
733        return pos;
734    }
735
736    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
737            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
738        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
739        jchar* textArray = env->GetCharArrayElements(text, NULL);
740        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
741                offset, cursorOpt);
742        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
743        return result;
744    }
745
746    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
747            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
748        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
749        const jchar* textArray = env->GetStringChars(text, NULL);
750        jint result = doTextRunCursor(env, paint, textArray, contextStart,
751                contextEnd - contextStart, flags, offset, cursorOpt);
752        env->ReleaseStringChars(text, textArray);
753        return result;
754    }
755
756    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
757                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
758        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
759    }
760
761    static void getTextPath___C(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
762            jcharArray text, jint index, jint count, jfloat x, jfloat y, jlong pathHandle) {
763        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
764        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
765        const jchar* textArray = env->GetCharArrayElements(text, NULL);
766        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
767        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
768    }
769
770    static void getTextPath__String(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
771            jstring text, jint start, jint end, jfloat x, jfloat y, jlong pathHandle) {
772        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
773        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
774        const jchar* textArray = env->GetStringChars(text, NULL);
775        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
776        env->ReleaseStringChars(text, textArray);
777    }
778
779    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
780                               jfloat dx, jfloat dy, jint color) {
781        NPE_CHECK_RETURN_VOID(env, jpaint);
782
783        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
784        if (radius <= 0) {
785            paint->setLooper(NULL);
786        }
787        else {
788            paint->setLooper(new SkBlurDrawLooper(radius, dx, dy, (SkColor)color))->unref();
789        }
790    }
791
792    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
793                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
794                         SkPaint::TextBufferDirection tbd) {
795        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
796                text, 0, count, count, bidiFlags);
797        if (value == NULL) {
798            return 0;
799        }
800        SkScalar     measured;
801        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
802                maxWidth, &measured, tbd);
803        SkASSERT((bytes & 1) == 0);
804
805        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
806            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
807            jfloat* array = autoMeasured.ptr();
808            array[0] = SkScalarToFloat(measured);
809        }
810        return bytes >> 1;
811    }
812
813    static jint breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
814            jint index, jint count, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
815        NPE_CHECK_RETURN_ZERO(env, jpaint);
816        NPE_CHECK_RETURN_ZERO(env, jtext);
817
818        SkPaint::TextBufferDirection tbd;
819        if (count < 0) {
820            tbd = SkPaint::kBackward_TextBufferDirection;
821            count = -count;
822        }
823        else {
824            tbd = SkPaint::kForward_TextBufferDirection;
825        }
826
827        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
828            doThrowAIOOBE(env);
829            return 0;
830        }
831
832        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
833        const jchar* text = env->GetCharArrayElements(jtext, NULL);
834        count = breakText(env, *paint, text + index, count, maxWidth,
835                          bidiFlags, jmeasuredWidth, tbd);
836        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
837                                      JNI_ABORT);
838        return count;
839    }
840
841    static jint breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
842                jboolean forwards, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
843        NPE_CHECK_RETURN_ZERO(env, jpaint);
844        NPE_CHECK_RETURN_ZERO(env, jtext);
845
846        SkPaint::TextBufferDirection tbd = forwards ?
847                                        SkPaint::kForward_TextBufferDirection :
848                                        SkPaint::kBackward_TextBufferDirection;
849
850        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
851        int count = env->GetStringLength(jtext);
852        const jchar* text = env->GetStringChars(jtext, NULL);
853        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
854        env->ReleaseStringChars(jtext, text);
855        return count;
856    }
857
858    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
859                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
860        SkRect  r;
861        SkIRect ir;
862
863        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
864                text, 0, count, count, bidiFlags);
865        if (value == NULL) {
866            return;
867        }
868        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
869        r.roundOut(&ir);
870        GraphicsJNI::irect_to_jrect(ir, env, bounds);
871    }
872
873    static void getStringBounds(JNIEnv* env, jobject, jlong paintHandle,
874                                jstring text, jint start, jint end, jint bidiFlags, jobject bounds) {
875        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);;
876        const jchar* textArray = env->GetStringChars(text, NULL);
877        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
878        env->ReleaseStringChars(text, textArray);
879    }
880
881    static void getCharArrayBounds(JNIEnv* env, jobject, jlong paintHandle,
882                        jcharArray text, jint index, jint count, jint bidiFlags, jobject bounds) {
883        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
884        const jchar* textArray = env->GetCharArrayElements(text, NULL);
885        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
886        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
887                                      JNI_ABORT);
888    }
889
890};
891
892static JNINativeMethod methods[] = {
893    {"finalizer", "(J)V", (void*) SkPaintGlue::finalizer},
894    {"native_init","()J", (void*) SkPaintGlue::init},
895    {"native_initWithPaint","(J)J", (void*) SkPaintGlue::initWithPaint},
896    {"native_reset","(J)V", (void*) SkPaintGlue::reset},
897    {"native_set","(JJ)V", (void*) SkPaintGlue::assign},
898    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
899    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
900    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
901    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
902    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
903    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
904    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
905    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
906    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
907    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
908    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
909    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
910    {"native_getStyle","(J)I", (void*) SkPaintGlue::getStyle},
911    {"native_setStyle","(JI)V", (void*) SkPaintGlue::setStyle},
912    {"getColor","()I", (void*) SkPaintGlue::getColor},
913    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
914    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
915    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
916    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
917    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
918    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
919    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
920    {"native_getStrokeCap","(J)I", (void*) SkPaintGlue::getStrokeCap},
921    {"native_setStrokeCap","(JI)V", (void*) SkPaintGlue::setStrokeCap},
922    {"native_getStrokeJoin","(J)I", (void*) SkPaintGlue::getStrokeJoin},
923    {"native_setStrokeJoin","(JI)V", (void*) SkPaintGlue::setStrokeJoin},
924    {"native_getFillPath","(JJJ)Z", (void*) SkPaintGlue::getFillPath},
925    {"native_setShader","(JJ)J", (void*) SkPaintGlue::setShader},
926    {"native_setColorFilter","(JJ)J", (void*) SkPaintGlue::setColorFilter},
927    {"native_setXfermode","(JJ)J", (void*) SkPaintGlue::setXfermode},
928    {"native_setPathEffect","(JJ)J", (void*) SkPaintGlue::setPathEffect},
929    {"native_setMaskFilter","(JJ)J", (void*) SkPaintGlue::setMaskFilter},
930    {"native_setTypeface","(JJ)J", (void*) SkPaintGlue::setTypeface},
931    {"native_setRasterizer","(JJ)J", (void*) SkPaintGlue::setRasterizer},
932    {"native_getTextAlign","(J)I", (void*) SkPaintGlue::getTextAlign},
933    {"native_setTextAlign","(JI)V", (void*) SkPaintGlue::setTextAlign},
934    {"native_setTextLocale","(JLjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
935    {"isElegantTextHeight","()Z", (void*) SkPaintGlue::isElegantTextHeight},
936    {"setElegantTextHeight","(Z)V", (void*) SkPaintGlue::setElegantTextHeight},
937    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
938    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
939    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
940    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
941    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
942    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
943    {"ascent","()F", (void*) SkPaintGlue::ascent},
944    {"descent","()F", (void*) SkPaintGlue::descent},
945    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
946    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
947    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
948    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
949    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
950    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
951    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
952    {"native_getTextWidths","(J[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
953    {"native_getTextWidths","(JLjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
954    {"native_getTextRunAdvances","(J[CIIIII[FI)F",
955        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
956    {"native_getTextRunAdvances","(JLjava/lang/String;IIIII[FI)F",
957        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
958
959
960    {"native_getTextGlyphs","(JLjava/lang/String;IIIII[C)I",
961        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
962    {"native_getTextRunCursor", "(J[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
963    {"native_getTextRunCursor", "(JLjava/lang/String;IIIII)I",
964        (void*) SkPaintGlue::getTextRunCursor__String},
965    {"native_getTextPath","(JI[CIIFFJ)V", (void*) SkPaintGlue::getTextPath___C},
966    {"native_getTextPath","(JILjava/lang/String;IIFFJ)V", (void*) SkPaintGlue::getTextPath__String},
967    {"nativeGetStringBounds", "(JLjava/lang/String;IIILandroid/graphics/Rect;)V",
968                                        (void*) SkPaintGlue::getStringBounds },
969    {"nativeGetCharArrayBounds", "(J[CIIILandroid/graphics/Rect;)V",
970                                    (void*) SkPaintGlue::getCharArrayBounds },
971    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
972};
973
974static jfieldID req_fieldID(jfieldID id) {
975    SkASSERT(id);
976    return id;
977}
978
979int register_android_graphics_Paint(JNIEnv* env) {
980    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
981    SkASSERT(gFontMetrics_class);
982    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
983
984    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
985    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
986    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
987    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
988    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
989
990    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
991    SkASSERT(gFontMetricsInt_class);
992    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
993
994    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
995    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
996    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
997    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
998    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
999
1000    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
1001        sizeof(methods) / sizeof(methods[0]));
1002    return result;
1003}
1004
1005}
1006