Paint.cpp revision 626d3c228116103e95d4429b06dad70f9812561a 
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_CIII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count,
387            jint bidiFlags) {
388        NPE_CHECK_RETURN_ZERO(env, jpaint);
389        NPE_CHECK_RETURN_ZERO(env, text);
390
391        size_t textLength = env->GetArrayLength(text);
392        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
393            doThrowAIOOBE(env);
394            return 0;
395        }
396        if (count == 0) {
397            return 0;
398        }
399
400        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
401        const jchar* textArray = env->GetCharArrayElements(text, NULL);
402        jfloat result = 0;
403
404        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
405                bidiFlags, NULL /* dont need all advances */, &result);
406
407        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
408        return result;
409    }
410
411    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, int start, int end,
412            jint bidiFlags) {
413        NPE_CHECK_RETURN_ZERO(env, jpaint);
414        NPE_CHECK_RETURN_ZERO(env, text);
415
416        size_t textLength = env->GetStringLength(text);
417        int count = end - start;
418        if ((start | count) < 0 || (size_t)end > textLength) {
419            doThrowAIOOBE(env);
420            return 0;
421        }
422        if (count == 0) {
423            return 0;
424        }
425
426        const jchar* textArray = env->GetStringChars(text, NULL);
427        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
428        jfloat width = 0;
429
430        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
431                bidiFlags, NULL /* dont need all advances */, &width);
432
433        env->ReleaseStringChars(text, textArray);
434        return width;
435    }
436
437    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
438        NPE_CHECK_RETURN_ZERO(env, jpaint);
439        NPE_CHECK_RETURN_ZERO(env, text);
440
441        size_t textLength = env->GetStringLength(text);
442        if (textLength == 0) {
443            return 0;
444        }
445
446        const jchar* textArray = env->GetStringChars(text, NULL);
447        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
448        jfloat width = 0;
449
450        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
451                bidiFlags, NULL /* dont need all advances */, &width);
452
453        env->ReleaseStringChars(text, textArray);
454        return width;
455    }
456
457    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
458            jint bidiFlags) {
459        NPE_CHECK_RETURN_ZERO(env, paint);
460        NPE_CHECK_RETURN_ZERO(env, text);
461
462        if (count < 0 || !widths) {
463            doThrowAIOOBE(env);
464            return 0;
465        }
466        if (count == 0) {
467            return 0;
468        }
469        size_t widthsLength = env->GetArrayLength(widths);
470        if ((size_t)count > widthsLength) {
471            doThrowAIOOBE(env);
472            return 0;
473        }
474
475        AutoJavaFloatArray autoWidths(env, widths, count);
476        jfloat* widthsArray = autoWidths.ptr();
477
478        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
479                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
480
481        return count;
482    }
483
484    static int getTextWidths___CIII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
485            int index, int count, jint bidiFlags, jfloatArray widths) {
486        const jchar* textArray = env->GetCharArrayElements(text, NULL);
487        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
488        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
489                                      JNI_ABORT);
490        return count;
491    }
492
493    static int getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
494            int start, int end, jint bidiFlags, jfloatArray widths) {
495        const jchar* textArray = env->GetStringChars(text, NULL);
496        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
497        env->ReleaseStringChars(text, textArray);
498        return count;
499    }
500
501    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
502            jint contextCount, jint flags, jcharArray glyphs) {
503        NPE_CHECK_RETURN_ZERO(env, paint);
504        NPE_CHECK_RETURN_ZERO(env, text);
505
506        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
507            doThrowAIOOBE(env);
508            return 0;
509        }
510        if (count == 0) {
511            return 0;
512        }
513        size_t glypthsLength = env->GetArrayLength(glyphs);
514        if ((size_t)count > glypthsLength) {
515            doThrowAIOOBE(env);
516            return 0;
517        }
518
519        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
520
521        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
522                text, start, count, contextCount, flags);
523        const jchar* shapedGlyphs = value->getGlyphs();
524        size_t glyphsCount = value->getGlyphsCount();
525        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
526
527        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
528        return glyphsCount;
529    }
530
531    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
532            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
533            jcharArray glyphs) {
534        const jchar* textArray = env->GetStringChars(text, NULL);
535        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
536                end - start, contextEnd - contextStart, flags, glyphs);
537        env->ReleaseStringChars(text, textArray);
538        return count;
539    }
540
541    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
542                                    jint start, jint count, jint contextCount, jint flags,
543                                    jfloatArray advances, jint advancesIndex) {
544        NPE_CHECK_RETURN_ZERO(env, paint);
545        NPE_CHECK_RETURN_ZERO(env, text);
546
547        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
548            doThrowAIOOBE(env);
549            return 0;
550        }
551        if (count == 0) {
552            return 0;
553        }
554        if (advances) {
555            size_t advancesLength = env->GetArrayLength(advances);
556            if ((size_t)count > advancesLength) {
557                doThrowAIOOBE(env);
558                return 0;
559            }
560        }
561        jfloat advancesArray[count];
562        jfloat totalAdvance = 0;
563
564        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
565                                       advancesArray, &totalAdvance);
566
567        if (advances != NULL) {
568            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
569        }
570        return totalAdvance;
571    }
572
573    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
574            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
575            jint flags, jfloatArray advances, jint advancesIndex) {
576        jchar* textArray = env->GetCharArrayElements(text, NULL);
577        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
578                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
579        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
580        return result;
581    }
582
583    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
584            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
585            jfloatArray advances, jint advancesIndex) {
586        const jchar* textArray = env->GetStringChars(text, NULL);
587        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
588                start - contextStart, end - start, contextEnd - contextStart, flags,
589                advances, advancesIndex);
590        env->ReleaseStringChars(text, textArray);
591        return result;
592    }
593
594    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
595            jint count, jint flags, jint offset, jint opt) {
596        jfloat scalarArray[count];
597
598        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
599                scalarArray, NULL /* dont need totalAdvance */);
600
601        jint pos = offset - start;
602        switch (opt) {
603        case AFTER:
604          if (pos < count) {
605            pos += 1;
606          }
607          // fall through
608        case AT_OR_AFTER:
609          while (pos < count && scalarArray[pos] == 0) {
610            ++pos;
611          }
612          break;
613        case BEFORE:
614          if (pos > 0) {
615            --pos;
616          }
617          // fall through
618        case AT_OR_BEFORE:
619          while (pos > 0 && scalarArray[pos] == 0) {
620            --pos;
621          }
622          break;
623        case AT:
624        default:
625          if (scalarArray[pos] == 0) {
626            pos = -1;
627          }
628          break;
629        }
630
631        if (pos != -1) {
632          pos += start;
633        }
634
635        return pos;
636    }
637
638    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
639            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
640        jchar* textArray = env->GetCharArrayElements(text, NULL);
641        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
642                offset, cursorOpt);
643        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
644        return result;
645    }
646
647    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
648            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
649        const jchar* textArray = env->GetStringChars(text, NULL);
650        jint result = doTextRunCursor(env, paint, textArray, contextStart,
651                contextEnd - contextStart, flags, offset, cursorOpt);
652        env->ReleaseStringChars(text, textArray);
653        return result;
654    }
655
656    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
657                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
658        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
659    }
660
661    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
662            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
663        const jchar* textArray = env->GetCharArrayElements(text, NULL);
664        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
665        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
666    }
667
668    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
669            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
670        const jchar* textArray = env->GetStringChars(text, NULL);
671        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
672        env->ReleaseStringChars(text, textArray);
673    }
674
675    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
676                               jfloat dx, jfloat dy, int color) {
677        NPE_CHECK_RETURN_VOID(env, jpaint);
678
679        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
680        if (radius <= 0) {
681            paint->setLooper(NULL);
682        }
683        else {
684            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
685                                                  SkFloatToScalar(dx),
686                                                  SkFloatToScalar(dy),
687                                                  (SkColor)color))->unref();
688        }
689    }
690
691    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
692                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
693                         SkPaint::TextBufferDirection tbd) {
694        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
695                text, 0, count, count, bidiFlags);
696        if (value == NULL) {
697            return 0;
698        }
699        SkScalar     measured;
700        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
701                                   SkFloatToScalar(maxWidth), &measured, tbd);
702        SkASSERT((bytes & 1) == 0);
703
704        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
705            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
706            jfloat* array = autoMeasured.ptr();
707            array[0] = SkScalarToFloat(measured);
708        }
709        return bytes >> 1;
710    }
711
712    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
713            int index, int count, float maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
714        NPE_CHECK_RETURN_ZERO(env, jpaint);
715        NPE_CHECK_RETURN_ZERO(env, jtext);
716
717        SkPaint::TextBufferDirection tbd;
718        if (count < 0) {
719            tbd = SkPaint::kBackward_TextBufferDirection;
720            count = -count;
721        }
722        else {
723            tbd = SkPaint::kForward_TextBufferDirection;
724        }
725
726        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
727            doThrowAIOOBE(env);
728            return 0;
729        }
730
731        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
732        const jchar* text = env->GetCharArrayElements(jtext, NULL);
733        count = breakText(env, *paint, text + index, count, maxWidth,
734                          bidiFlags, jmeasuredWidth, tbd);
735        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
736                                      JNI_ABORT);
737        return count;
738    }
739
740    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
741                bool forwards, float maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
742        NPE_CHECK_RETURN_ZERO(env, jpaint);
743        NPE_CHECK_RETURN_ZERO(env, jtext);
744
745        SkPaint::TextBufferDirection tbd = forwards ?
746                                        SkPaint::kForward_TextBufferDirection :
747                                        SkPaint::kBackward_TextBufferDirection;
748
749        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
750        int count = env->GetStringLength(jtext);
751        const jchar* text = env->GetStringChars(jtext, NULL);
752        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
753        env->ReleaseStringChars(jtext, text);
754        return count;
755    }
756
757    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
758                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
759        SkRect  r;
760        r.set(0,0,0,0);
761
762        SkIRect ir;
763
764        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
765                text, 0, count, count, bidiFlags);
766        if (value == NULL) {
767            return;
768        }
769        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
770        r.roundOut(&ir);
771        GraphicsJNI::irect_to_jrect(ir, env, bounds);
772    }
773
774    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
775                                jstring text, int start, int end, jint bidiFlags, jobject bounds) {
776        const jchar* textArray = env->GetStringChars(text, NULL);
777        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
778        env->ReleaseStringChars(text, textArray);
779    }
780
781    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
782                        jcharArray text, int index, int count, jint bidiFlags, jobject bounds) {
783        const jchar* textArray = env->GetCharArrayElements(text, NULL);
784        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
785        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
786                                      JNI_ABORT);
787    }
788
789};
790
791static JNINativeMethod methods[] = {
792    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
793    {"native_init","()I", (void*) SkPaintGlue::init},
794    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
795    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
796    {"native_set","(II)V", (void*) SkPaintGlue::assign},
797    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
798    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
799    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
800    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
801    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
802    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
803    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
804    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
805    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
806    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
807    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
808    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
809    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
810    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
811    {"getColor","()I", (void*) SkPaintGlue::getColor},
812    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
813    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
814    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
815    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
816    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
817    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
818    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
819    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
820    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
821    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
822    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
823    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
824    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
825    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
826    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
827    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
828    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
829    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
830    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
831    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
832    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
833    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
834    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
835    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
836    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
837    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
838    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
839    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
840    {"ascent","()F", (void*) SkPaintGlue::ascent},
841    {"descent","()F", (void*) SkPaintGlue::descent},
842    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
843    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
844    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
845    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
846    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
847    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
848    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
849    {"native_getTextWidths","(I[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
850    {"native_getTextWidths","(ILjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
851    {"native_getTextRunAdvances","(I[CIIIII[FI)F",
852        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
853    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
854        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
855
856
857    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
858        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
859    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
860    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
861        (void*) SkPaintGlue::getTextRunCursor__String},
862    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
863    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
864    {"nativeGetStringBounds", "(ILjava/lang/String;IIILandroid/graphics/Rect;)V",
865                                        (void*) SkPaintGlue::getStringBounds },
866    {"nativeGetCharArrayBounds", "(I[CIIILandroid/graphics/Rect;)V",
867                                    (void*) SkPaintGlue::getCharArrayBounds },
868    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
869};
870
871static jfieldID req_fieldID(jfieldID id) {
872    SkASSERT(id);
873    return id;
874}
875
876int register_android_graphics_Paint(JNIEnv* env) {
877    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
878    SkASSERT(gFontMetrics_class);
879    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
880
881    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
882    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
883    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
884    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
885    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
886
887    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
888    SkASSERT(gFontMetricsInt_class);
889    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
890
891    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
892    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
893    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
894    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
895    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
896
897    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
898        sizeof(methods) / sizeof(methods[0]));
899    return result;
900}
901
902}
903