Paint.cpp revision f8d8777dddf91c741981b4f795f2fb2b1d81c1b6 
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(SkFloatToScalar(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(SkFloatToScalar(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        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
283        SkTypeface* typeface = reinterpret_cast<SkTypeface*>(typefaceHandle);
284        return reinterpret_cast<jlong>(obj->setTypeface(typeface));
285    }
286
287    static jlong setRasterizer(JNIEnv* env, jobject clazz, jlong objHandle, jlong rasterizerHandle) {
288        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
289        SkRasterizer* rasterizer = reinterpret_cast<SkRasterizer*>(rasterizerHandle);
290        return reinterpret_cast<jlong>(obj->setRasterizer(rasterizer));
291    }
292
293    static jint getTextAlign(JNIEnv* env, jobject clazz, jlong objHandle) {
294        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
295        return static_cast<jint>(obj->getTextAlign());
296    }
297
298    static void setTextAlign(JNIEnv* env, jobject clazz, jlong objHandle, jint alignHandle) {
299        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
300        SkPaint::Align align = static_cast<SkPaint::Align>(alignHandle);
301        obj->setTextAlign(align);
302    }
303
304    // generate bcp47 identifier for the supplied locale
305    static void toLanguageTag(char* output, size_t outSize,
306            const char* locale) {
307        if (output == NULL || outSize <= 0) {
308            return;
309        }
310        if (locale == NULL) {
311            output[0] = '\0';
312            return;
313        }
314        char canonicalChars[ULOC_FULLNAME_CAPACITY];
315        UErrorCode uErr = U_ZERO_ERROR;
316        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
317                &uErr);
318        if (U_SUCCESS(uErr)) {
319            char likelyChars[ULOC_FULLNAME_CAPACITY];
320            uErr = U_ZERO_ERROR;
321            uloc_addLikelySubtags(canonicalChars, likelyChars,
322                    ULOC_FULLNAME_CAPACITY, &uErr);
323            if (U_SUCCESS(uErr)) {
324                uErr = U_ZERO_ERROR;
325                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
326                if (U_SUCCESS(uErr)) {
327                    return;
328                } else {
329                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
330                            u_errorName(uErr));
331                }
332            } else {
333                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
334                        canonicalChars, u_errorName(uErr));
335            }
336        } else {
337            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
338                    u_errorName(uErr));
339        }
340        // unable to build a proper language identifier
341        output[0] = '\0';
342    }
343
344    static void setTextLocale(JNIEnv* env, jobject clazz, jlong objHandle, jstring locale) {
345        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
346        ScopedUtfChars localeChars(env, locale);
347        char langTag[ULOC_FULLNAME_CAPACITY];
348        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
349
350        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
351        paintOpts.setLanguage(langTag);
352        obj->setPaintOptionsAndroid(paintOpts);
353    }
354
355    static jfloat getTextSize(JNIEnv* env, jobject paint) {
356        NPE_CHECK_RETURN_ZERO(env, paint);
357        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
358    }
359
360    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
361        NPE_CHECK_RETURN_VOID(env, paint);
362        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
363    }
364
365    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
366        NPE_CHECK_RETURN_ZERO(env, paint);
367        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
368    }
369
370    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
371        NPE_CHECK_RETURN_VOID(env, paint);
372        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
373    }
374
375    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
376        NPE_CHECK_RETURN_ZERO(env, paint);
377        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
378    }
379
380    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
381        NPE_CHECK_RETURN_VOID(env, paint);
382        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
383    }
384
385    static jfloat ascent(JNIEnv* env, jobject paint) {
386        NPE_CHECK_RETURN_ZERO(env, paint);
387        SkPaint::FontMetrics    metrics;
388        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
389        return SkScalarToFloat(metrics.fAscent);
390    }
391
392    static jfloat descent(JNIEnv* env, jobject paint) {
393        NPE_CHECK_RETURN_ZERO(env, paint);
394        SkPaint::FontMetrics    metrics;
395        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
396        return SkScalarToFloat(metrics.fDescent);
397    }
398
399    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
400        NPE_CHECK_RETURN_ZERO(env, paint);
401        SkPaint::FontMetrics metrics;
402        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
403
404        if (metricsObj) {
405            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
406            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
407            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
408            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
409            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
410            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
411        }
412        return SkScalarToFloat(spacing);
413    }
414
415    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
416        NPE_CHECK_RETURN_ZERO(env, paint);
417        SkPaint::FontMetrics metrics;
418
419        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
420        int ascent = SkScalarRound(metrics.fAscent);
421        int descent = SkScalarRound(metrics.fDescent);
422        int leading = SkScalarRound(metrics.fLeading);
423
424        if (metricsObj) {
425            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
426            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
427            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
428            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
429            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
430            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
431        }
432        return descent - ascent + leading;
433    }
434
435    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, jint index, jint count,
436            jint bidiFlags) {
437        NPE_CHECK_RETURN_ZERO(env, jpaint);
438        NPE_CHECK_RETURN_ZERO(env, text);
439
440        size_t textLength = env->GetArrayLength(text);
441        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
442            doThrowAIOOBE(env);
443            return 0;
444        }
445        if (count == 0) {
446            return 0;
447        }
448
449        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
450        const jchar* textArray = env->GetCharArrayElements(text, NULL);
451        jfloat result = 0;
452
453        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
454                bidiFlags, NULL /* dont need all advances */, &result);
455
456        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
457        return result;
458    }
459
460    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, jint start, jint end,
461            jint bidiFlags) {
462        NPE_CHECK_RETURN_ZERO(env, jpaint);
463        NPE_CHECK_RETURN_ZERO(env, text);
464
465        size_t textLength = env->GetStringLength(text);
466        int count = end - start;
467        if ((start | count) < 0 || (size_t)end > textLength) {
468            doThrowAIOOBE(env);
469            return 0;
470        }
471        if (count == 0) {
472            return 0;
473        }
474
475        const jchar* textArray = env->GetStringChars(text, NULL);
476        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
477        jfloat width = 0;
478
479        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
480                bidiFlags, NULL /* dont need all advances */, &width);
481
482        env->ReleaseStringChars(text, textArray);
483        return width;
484    }
485
486    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
487        NPE_CHECK_RETURN_ZERO(env, jpaint);
488        NPE_CHECK_RETURN_ZERO(env, text);
489
490        size_t textLength = env->GetStringLength(text);
491        if (textLength == 0) {
492            return 0;
493        }
494
495        const jchar* textArray = env->GetStringChars(text, NULL);
496        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
497        jfloat width = 0;
498
499        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
500                bidiFlags, NULL /* dont need all advances */, &width);
501
502        env->ReleaseStringChars(text, textArray);
503        return width;
504    }
505
506    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
507            jint bidiFlags) {
508        NPE_CHECK_RETURN_ZERO(env, paint);
509        NPE_CHECK_RETURN_ZERO(env, text);
510
511        if (count < 0 || !widths) {
512            doThrowAIOOBE(env);
513            return 0;
514        }
515        if (count == 0) {
516            return 0;
517        }
518        size_t widthsLength = env->GetArrayLength(widths);
519        if ((size_t)count > widthsLength) {
520            doThrowAIOOBE(env);
521            return 0;
522        }
523
524        AutoJavaFloatArray autoWidths(env, widths, count);
525        jfloat* widthsArray = autoWidths.ptr();
526
527        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
528                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
529
530        return count;
531    }
532
533    static jint getTextWidths___CIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
534            jint index, jint count, jint bidiFlags, jfloatArray widths) {
535        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
536        const jchar* textArray = env->GetCharArrayElements(text, NULL);
537        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
538        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
539                                      JNI_ABORT);
540        return count;
541    }
542
543    static jint getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
544            jint start, jint end, jint bidiFlags, jfloatArray widths) {
545        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
546        const jchar* textArray = env->GetStringChars(text, NULL);
547        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
548        env->ReleaseStringChars(text, textArray);
549        return count;
550    }
551
552    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
553            jint contextCount, jint flags, jcharArray glyphs) {
554        NPE_CHECK_RETURN_ZERO(env, paint);
555        NPE_CHECK_RETURN_ZERO(env, text);
556
557        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
558            doThrowAIOOBE(env);
559            return 0;
560        }
561        if (count == 0) {
562            return 0;
563        }
564        size_t glypthsLength = env->GetArrayLength(glyphs);
565        if ((size_t)count > glypthsLength) {
566            doThrowAIOOBE(env);
567            return 0;
568        }
569
570        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
571
572        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
573                text, start, count, contextCount, flags);
574        const jchar* shapedGlyphs = value->getGlyphs();
575        size_t glyphsCount = value->getGlyphsCount();
576        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
577
578        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
579        return glyphsCount;
580    }
581
582    static jint getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, jlong paintHandle,
583            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
584            jcharArray glyphs) {
585        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
586        const jchar* textArray = env->GetStringChars(text, NULL);
587        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
588                end - start, contextEnd - contextStart, flags, glyphs);
589        env->ReleaseStringChars(text, textArray);
590        return count;
591    }
592
593    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
594                                    jint start, jint count, jint contextCount, jint flags,
595                                    jfloatArray advances, jint advancesIndex) {
596        NPE_CHECK_RETURN_ZERO(env, paint);
597        NPE_CHECK_RETURN_ZERO(env, text);
598
599        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
600            doThrowAIOOBE(env);
601            return 0;
602        }
603        if (count == 0) {
604            return 0;
605        }
606        if (advances) {
607            size_t advancesLength = env->GetArrayLength(advances);
608            if ((size_t)count > advancesLength) {
609                doThrowAIOOBE(env);
610                return 0;
611            }
612        }
613        jfloat advancesArray[count];
614        jfloat totalAdvance = 0;
615
616        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
617                                       advancesArray, &totalAdvance);
618
619        if (advances != NULL) {
620            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
621        }
622        return totalAdvance;
623    }
624
625    static jfloat getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
626            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
627            jint flags, jfloatArray advances, jint advancesIndex) {
628        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
629        jchar* textArray = env->GetCharArrayElements(text, NULL);
630        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
631                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
632        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
633        return result;
634    }
635
636    static jfloat getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
637            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
638            jfloatArray advances, jint advancesIndex) {
639        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
640        const jchar* textArray = env->GetStringChars(text, NULL);
641        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
642                start - contextStart, end - start, contextEnd - contextStart, flags,
643                advances, advancesIndex);
644        env->ReleaseStringChars(text, textArray);
645        return result;
646    }
647
648    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
649            jint count, jint flags, jint offset, jint opt) {
650        jfloat scalarArray[count];
651
652        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
653                scalarArray, NULL /* dont need totalAdvance */);
654
655        jint pos = offset - start;
656        switch (opt) {
657        case AFTER:
658          if (pos < count) {
659            pos += 1;
660          }
661          // fall through
662        case AT_OR_AFTER:
663          while (pos < count && scalarArray[pos] == 0) {
664            ++pos;
665          }
666          break;
667        case BEFORE:
668          if (pos > 0) {
669            --pos;
670          }
671          // fall through
672        case AT_OR_BEFORE:
673          while (pos > 0 && scalarArray[pos] == 0) {
674            --pos;
675          }
676          break;
677        case AT:
678        default:
679          if (scalarArray[pos] == 0) {
680            pos = -1;
681          }
682          break;
683        }
684
685        if (pos != -1) {
686          pos += start;
687        }
688
689        return pos;
690    }
691
692    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
693            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
694        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
695        jchar* textArray = env->GetCharArrayElements(text, NULL);
696        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
697                offset, cursorOpt);
698        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
699        return result;
700    }
701
702    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
703            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
704        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
705        const jchar* textArray = env->GetStringChars(text, NULL);
706        jint result = doTextRunCursor(env, paint, textArray, contextStart,
707                contextEnd - contextStart, flags, offset, cursorOpt);
708        env->ReleaseStringChars(text, textArray);
709        return result;
710    }
711
712    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
713                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
714        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
715    }
716
717    static void getTextPath___C(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
718            jcharArray text, jint index, jint count, jfloat x, jfloat y, jlong pathHandle) {
719        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
720        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
721        const jchar* textArray = env->GetCharArrayElements(text, NULL);
722        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
723        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
724    }
725
726    static void getTextPath__String(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
727            jstring text, jint start, jint end, jfloat x, jfloat y, jlong pathHandle) {
728        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
729        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
730        const jchar* textArray = env->GetStringChars(text, NULL);
731        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
732        env->ReleaseStringChars(text, textArray);
733    }
734
735    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
736                               jfloat dx, jfloat dy, jint color) {
737        NPE_CHECK_RETURN_VOID(env, jpaint);
738
739        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
740        if (radius <= 0) {
741            paint->setLooper(NULL);
742        }
743        else {
744            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
745                                                  SkFloatToScalar(dx),
746                                                  SkFloatToScalar(dy),
747                                                  (SkColor)color))->unref();
748        }
749    }
750
751    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
752                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
753                         SkPaint::TextBufferDirection tbd) {
754        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
755                text, 0, count, count, bidiFlags);
756        if (value == NULL) {
757            return 0;
758        }
759        SkScalar     measured;
760        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
761                                   SkFloatToScalar(maxWidth), &measured, tbd);
762        SkASSERT((bytes & 1) == 0);
763
764        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
765            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
766            jfloat* array = autoMeasured.ptr();
767            array[0] = SkScalarToFloat(measured);
768        }
769        return bytes >> 1;
770    }
771
772    static jint breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
773            jint index, jint count, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
774        NPE_CHECK_RETURN_ZERO(env, jpaint);
775        NPE_CHECK_RETURN_ZERO(env, jtext);
776
777        SkPaint::TextBufferDirection tbd;
778        if (count < 0) {
779            tbd = SkPaint::kBackward_TextBufferDirection;
780            count = -count;
781        }
782        else {
783            tbd = SkPaint::kForward_TextBufferDirection;
784        }
785
786        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
787            doThrowAIOOBE(env);
788            return 0;
789        }
790
791        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
792        const jchar* text = env->GetCharArrayElements(jtext, NULL);
793        count = breakText(env, *paint, text + index, count, maxWidth,
794                          bidiFlags, jmeasuredWidth, tbd);
795        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
796                                      JNI_ABORT);
797        return count;
798    }
799
800    static jint breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
801                jboolean forwards, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
802        NPE_CHECK_RETURN_ZERO(env, jpaint);
803        NPE_CHECK_RETURN_ZERO(env, jtext);
804
805        SkPaint::TextBufferDirection tbd = forwards ?
806                                        SkPaint::kForward_TextBufferDirection :
807                                        SkPaint::kBackward_TextBufferDirection;
808
809        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
810        int count = env->GetStringLength(jtext);
811        const jchar* text = env->GetStringChars(jtext, NULL);
812        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
813        env->ReleaseStringChars(jtext, text);
814        return count;
815    }
816
817    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
818                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
819        SkRect  r;
820        SkIRect ir;
821
822        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
823                text, 0, count, count, bidiFlags);
824        if (value == NULL) {
825            return;
826        }
827        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
828        r.roundOut(&ir);
829        GraphicsJNI::irect_to_jrect(ir, env, bounds);
830    }
831
832    static void getStringBounds(JNIEnv* env, jobject, jlong paintHandle,
833                                jstring text, jint start, jint end, jint bidiFlags, jobject bounds) {
834        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);;
835        const jchar* textArray = env->GetStringChars(text, NULL);
836        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
837        env->ReleaseStringChars(text, textArray);
838    }
839
840    static void getCharArrayBounds(JNIEnv* env, jobject, jlong paintHandle,
841                        jcharArray text, jint index, jint count, jint bidiFlags, jobject bounds) {
842        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
843        const jchar* textArray = env->GetCharArrayElements(text, NULL);
844        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
845        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
846                                      JNI_ABORT);
847    }
848
849};
850
851static JNINativeMethod methods[] = {
852    {"finalizer", "(J)V", (void*) SkPaintGlue::finalizer},
853    {"native_init","()J", (void*) SkPaintGlue::init},
854    {"native_initWithPaint","(J)J", (void*) SkPaintGlue::initWithPaint},
855    {"native_reset","(J)V", (void*) SkPaintGlue::reset},
856    {"native_set","(JJ)V", (void*) SkPaintGlue::assign},
857    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
858    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
859    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
860    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
861    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
862    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
863    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
864    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
865    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
866    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
867    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
868    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
869    {"native_getStyle","(J)I", (void*) SkPaintGlue::getStyle},
870    {"native_setStyle","(JI)V", (void*) SkPaintGlue::setStyle},
871    {"getColor","()I", (void*) SkPaintGlue::getColor},
872    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
873    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
874    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
875    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
876    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
877    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
878    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
879    {"native_getStrokeCap","(J)I", (void*) SkPaintGlue::getStrokeCap},
880    {"native_setStrokeCap","(JI)V", (void*) SkPaintGlue::setStrokeCap},
881    {"native_getStrokeJoin","(J)I", (void*) SkPaintGlue::getStrokeJoin},
882    {"native_setStrokeJoin","(JI)V", (void*) SkPaintGlue::setStrokeJoin},
883    {"native_getFillPath","(JJJ)Z", (void*) SkPaintGlue::getFillPath},
884    {"native_setShader","(JJ)J", (void*) SkPaintGlue::setShader},
885    {"native_setColorFilter","(JJ)J", (void*) SkPaintGlue::setColorFilter},
886    {"native_setXfermode","(JJ)J", (void*) SkPaintGlue::setXfermode},
887    {"native_setPathEffect","(JJ)J", (void*) SkPaintGlue::setPathEffect},
888    {"native_setMaskFilter","(JJ)J", (void*) SkPaintGlue::setMaskFilter},
889    {"native_setTypeface","(JJ)J", (void*) SkPaintGlue::setTypeface},
890    {"native_setRasterizer","(JJ)J", (void*) SkPaintGlue::setRasterizer},
891    {"native_getTextAlign","(J)I", (void*) SkPaintGlue::getTextAlign},
892    {"native_setTextAlign","(JI)V", (void*) SkPaintGlue::setTextAlign},
893    {"native_setTextLocale","(JLjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
894    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
895    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
896    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
897    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
898    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
899    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
900    {"ascent","()F", (void*) SkPaintGlue::ascent},
901    {"descent","()F", (void*) SkPaintGlue::descent},
902    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
903    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
904    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
905    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
906    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
907    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
908    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
909    {"native_getTextWidths","(J[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
910    {"native_getTextWidths","(JLjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
911    {"native_getTextRunAdvances","(J[CIIIII[FI)F",
912        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
913    {"native_getTextRunAdvances","(JLjava/lang/String;IIIII[FI)F",
914        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
915
916
917    {"native_getTextGlyphs","(JLjava/lang/String;IIIII[C)I",
918        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
919    {"native_getTextRunCursor", "(J[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
920    {"native_getTextRunCursor", "(JLjava/lang/String;IIIII)I",
921        (void*) SkPaintGlue::getTextRunCursor__String},
922    {"native_getTextPath","(JI[CIIFFJ)V", (void*) SkPaintGlue::getTextPath___C},
923    {"native_getTextPath","(JILjava/lang/String;IIFFJ)V", (void*) SkPaintGlue::getTextPath__String},
924    {"nativeGetStringBounds", "(JLjava/lang/String;IIILandroid/graphics/Rect;)V",
925                                        (void*) SkPaintGlue::getStringBounds },
926    {"nativeGetCharArrayBounds", "(J[CIIILandroid/graphics/Rect;)V",
927                                    (void*) SkPaintGlue::getCharArrayBounds },
928    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
929};
930
931static jfieldID req_fieldID(jfieldID id) {
932    SkASSERT(id);
933    return id;
934}
935
936int register_android_graphics_Paint(JNIEnv* env) {
937    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
938    SkASSERT(gFontMetrics_class);
939    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
940
941    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
942    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
943    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
944    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
945    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
946
947    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
948    SkASSERT(gFontMetricsInt_class);
949    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
950
951    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
952    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
953    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
954    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
955    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
956
957    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
958        sizeof(methods) / sizeof(methods[0]));
959    return result;
960}
961
962}
963