Paint.cpp revision c1eff0857ebc6abce48ba8c267ab32109dd45ef0 
1/* libs/android_runtime/android/graphics/Paint.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "Paint"
19
20#include <utils/Log.h>
21
22#include "jni.h"
23#include "GraphicsJNI.h"
24#include <android_runtime/AndroidRuntime.h>
25#include <ScopedUtfChars.h>
26
27#include "SkBlurDrawLooper.h"
28#include "SkColorFilter.h"
29#include "SkMaskFilter.h"
30#include "SkRasterizer.h"
31#include "SkShader.h"
32#include "SkTypeface.h"
33#include "SkXfermode.h"
34#include "unicode/uloc.h"
35#include "unicode/ushape.h"
36#include "TextLayout.h"
37
38// temporary for debugging
39#include <Caches.h>
40#include <utils/Log.h>
41
42namespace android {
43
44struct JMetricsID {
45    jfieldID    top;
46    jfieldID    ascent;
47    jfieldID    descent;
48    jfieldID    bottom;
49    jfieldID    leading;
50};
51
52static jclass   gFontMetrics_class;
53static JMetricsID gFontMetrics_fieldID;
54
55static jclass   gFontMetricsInt_class;
56static JMetricsID gFontMetricsInt_fieldID;
57
58static void defaultSettingsForAndroid(SkPaint* paint) {
59    // GlyphID encoding is required because we are using Harfbuzz shaping
60    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
61}
62
63class SkPaintGlue {
64public:
65    enum MoveOpt {
66        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
67    };
68
69    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
70        delete obj;
71    }
72
73    static SkPaint* init(JNIEnv* env, jobject clazz) {
74        SkPaint* obj = new SkPaint();
75        defaultSettingsForAndroid(obj);
76        return obj;
77    }
78
79    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
80        SkPaint* obj = new SkPaint(*paint);
81        return obj;
82    }
83
84    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
85        obj->reset();
86        defaultSettingsForAndroid(obj);
87    }
88
89    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
90        *dst = *src;
91    }
92
93    static jint getFlags(JNIEnv* env, jobject paint) {
94        NPE_CHECK_RETURN_ZERO(env, paint);
95        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
96    }
97
98    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
99        NPE_CHECK_RETURN_VOID(env, paint);
100        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
101    }
102
103    static jint getHinting(JNIEnv* env, jobject paint) {
104        NPE_CHECK_RETURN_ZERO(env, paint);
105        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
106                == SkPaint::kNo_Hinting ? 0 : 1;
107    }
108
109    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setHinting(
112                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kSlight_Hinting);
113    }
114
115    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
116        NPE_CHECK_RETURN_VOID(env, paint);
117        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
118    }
119
120    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
121        NPE_CHECK_RETURN_VOID(env, paint);
122        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
123    }
124
125    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
126        NPE_CHECK_RETURN_VOID(env, paint);
127        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
128    }
129
130    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
131        NPE_CHECK_RETURN_VOID(env, paint);
132        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
133    }
134
135    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
136        NPE_CHECK_RETURN_VOID(env, paint);
137        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
138    }
139
140    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
141        NPE_CHECK_RETURN_VOID(env, paint);
142        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
143    }
144
145    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
146        NPE_CHECK_RETURN_VOID(env, paint);
147        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
148    }
149
150    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
151        NPE_CHECK_RETURN_VOID(env, paint);
152        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
153    }
154
155    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
156        return obj->getStyle();
157    }
158
159    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
160        obj->setStyle(style);
161    }
162
163    static jint getColor(JNIEnv* env, jobject paint) {
164        NPE_CHECK_RETURN_ZERO(env, paint);
165        return GraphicsJNI::getNativePaint(env, paint)->getColor();
166    }
167
168    static jint getAlpha(JNIEnv* env, jobject paint) {
169        NPE_CHECK_RETURN_ZERO(env, paint);
170        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
171    }
172
173    static void setColor(JNIEnv* env, jobject paint, jint color) {
174        NPE_CHECK_RETURN_VOID(env, paint);
175        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
176    }
177
178    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
179        NPE_CHECK_RETURN_VOID(env, paint);
180        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
181    }
182
183    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
184        NPE_CHECK_RETURN_ZERO(env, paint);
185        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
186    }
187
188    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
189        NPE_CHECK_RETURN_VOID(env, paint);
190        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
191    }
192
193    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
194        NPE_CHECK_RETURN_ZERO(env, paint);
195        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
196    }
197
198    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
199        NPE_CHECK_RETURN_VOID(env, paint);
200        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
201    }
202
203    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
204        return obj->getStrokeCap();
205    }
206
207    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
208        obj->setStrokeCap(cap);
209    }
210
211    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
212        return obj->getStrokeJoin();
213    }
214
215    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
216        obj->setStrokeJoin(join);
217    }
218
219    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
220        return obj->getFillPath(*src, dst);
221    }
222
223    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
224        return obj->setShader(shader);
225    }
226
227    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
228        return obj->setColorFilter(filter);
229    }
230
231    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
232        return obj->setXfermode(xfermode);
233    }
234
235    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
236        return obj->setPathEffect(effect);
237    }
238
239    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
240        return obj->setMaskFilter(maskfilter);
241    }
242
243    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
244        return obj->setTypeface(typeface);
245    }
246
247    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
248        return obj->setRasterizer(rasterizer);
249    }
250
251    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
252        return obj->getTextAlign();
253    }
254
255    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
256        obj->setTextAlign(align);
257    }
258
259    // generate bcp47 identifier for the supplied locale
260    static void toLanguageTag(char* output, size_t outSize,
261            const char* locale) {
262        if (output == NULL || outSize <= 0) {
263            return;
264        }
265        if (locale == NULL) {
266            output[0] = '\0';
267            return;
268        }
269        char canonicalChars[ULOC_FULLNAME_CAPACITY];
270        UErrorCode uErr = U_ZERO_ERROR;
271        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
272                &uErr);
273        if (U_SUCCESS(uErr)) {
274            char likelyChars[ULOC_FULLNAME_CAPACITY];
275            uErr = U_ZERO_ERROR;
276            uloc_addLikelySubtags(canonicalChars, likelyChars,
277                    ULOC_FULLNAME_CAPACITY, &uErr);
278            if (U_SUCCESS(uErr)) {
279                uErr = U_ZERO_ERROR;
280                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
281                if (U_SUCCESS(uErr)) {
282                    return;
283                } else {
284                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
285                            u_errorName(uErr));
286                }
287            } else {
288                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
289                        canonicalChars, u_errorName(uErr));
290            }
291        } else {
292            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
293                    u_errorName(uErr));
294        }
295        // unable to build a proper language identifier
296        output[0] = '\0';
297    }
298
299    static void setTextLocale(JNIEnv* env, jobject clazz, SkPaint* obj, jstring locale) {
300        ScopedUtfChars localeChars(env, locale);
301        char langTag[ULOC_FULLNAME_CAPACITY];
302        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
303        obj->setLanguage(SkLanguage(langTag));
304    }
305
306    static jfloat getTextSize(JNIEnv* env, jobject paint) {
307        NPE_CHECK_RETURN_ZERO(env, paint);
308        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
309    }
310
311    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
312        NPE_CHECK_RETURN_VOID(env, paint);
313        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
314    }
315
316    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
317        NPE_CHECK_RETURN_ZERO(env, paint);
318        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
319    }
320
321    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
322        NPE_CHECK_RETURN_VOID(env, paint);
323        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
324    }
325
326    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
327        NPE_CHECK_RETURN_ZERO(env, paint);
328        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
329    }
330
331    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
332        NPE_CHECK_RETURN_VOID(env, paint);
333        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
334    }
335
336    static jfloat ascent(JNIEnv* env, jobject paint) {
337        NPE_CHECK_RETURN_ZERO(env, paint);
338        SkPaint::FontMetrics    metrics;
339        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
340        return SkScalarToFloat(metrics.fAscent);
341    }
342
343    static jfloat descent(JNIEnv* env, jobject paint) {
344        NPE_CHECK_RETURN_ZERO(env, paint);
345        SkPaint::FontMetrics    metrics;
346        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
347        return SkScalarToFloat(metrics.fDescent);
348    }
349
350    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
351        NPE_CHECK_RETURN_ZERO(env, paint);
352        SkPaint::FontMetrics metrics;
353        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
354
355        if (metricsObj) {
356            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
357            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
358            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
359            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
360            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
361            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
362        }
363        return SkScalarToFloat(spacing);
364    }
365
366    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
367        NPE_CHECK_RETURN_ZERO(env, paint);
368        SkPaint::FontMetrics metrics;
369
370        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
371        int ascent = SkScalarRound(metrics.fAscent);
372        int descent = SkScalarRound(metrics.fDescent);
373        int leading = SkScalarRound(metrics.fLeading);
374
375        if (metricsObj) {
376            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
377            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
378            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
379            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
380            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
381            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
382        }
383        return descent - ascent + leading;
384    }
385
386    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
387        NPE_CHECK_RETURN_ZERO(env, jpaint);
388        NPE_CHECK_RETURN_ZERO(env, text);
389
390        size_t textLength = env->GetArrayLength(text);
391        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
392            doThrowAIOOBE(env);
393            return 0;
394        }
395        if (count == 0) {
396            return 0;
397        }
398
399        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
400        const jchar* textArray = env->GetCharArrayElements(text, NULL);
401        jfloat result = 0;
402
403        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
404                paint->getFlags(), NULL /* dont need all advances */, &result);
405
406        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
407        return result;
408    }
409
410    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
411        NPE_CHECK_RETURN_ZERO(env, jpaint);
412        NPE_CHECK_RETURN_ZERO(env, text);
413
414        size_t textLength = env->GetStringLength(text);
415        int count = end - start;
416        if ((start | count) < 0 || (size_t)end > textLength) {
417            doThrowAIOOBE(env);
418            return 0;
419        }
420        if (count == 0) {
421            return 0;
422        }
423
424        const jchar* textArray = env->GetStringChars(text, NULL);
425        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
426        jfloat width = 0;
427
428        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
429                paint->getFlags(), NULL /* dont need all advances */, &width);
430
431        env->ReleaseStringChars(text, textArray);
432        return width;
433    }
434
435    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
436        NPE_CHECK_RETURN_ZERO(env, jpaint);
437        NPE_CHECK_RETURN_ZERO(env, text);
438
439        size_t textLength = env->GetStringLength(text);
440        if (textLength == 0) {
441            return 0;
442        }
443
444        const jchar* textArray = env->GetStringChars(text, NULL);
445        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
446        jfloat width = 0;
447
448        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
449                paint->getFlags(), NULL /* dont need all advances */, &width);
450
451        env->ReleaseStringChars(text, textArray);
452        return width;
453    }
454
455    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
456        NPE_CHECK_RETURN_ZERO(env, paint);
457        NPE_CHECK_RETURN_ZERO(env, text);
458
459        if (count < 0 || !widths) {
460            doThrowAIOOBE(env);
461            return 0;
462        }
463        if (count == 0) {
464            return 0;
465        }
466        size_t widthsLength = env->GetArrayLength(widths);
467        if ((size_t)count > widthsLength) {
468            doThrowAIOOBE(env);
469            return 0;
470        }
471
472        AutoJavaFloatArray autoWidths(env, widths, count);
473        jfloat* widthsArray = autoWidths.ptr();
474
475        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
476                paint->getFlags(), widthsArray, NULL /* dont need totalAdvance */);
477
478        return count;
479    }
480
481    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
482        const jchar* textArray = env->GetCharArrayElements(text, NULL);
483        count = dotextwidths(env, paint, textArray + index, count, widths);
484        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
485                                      JNI_ABORT);
486        return count;
487    }
488
489    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
490            int start, int end, jfloatArray widths) {
491        const jchar* textArray = env->GetStringChars(text, NULL);
492        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
493        env->ReleaseStringChars(text, textArray);
494        return count;
495    }
496
497    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
498            jint contextCount, jint flags, jcharArray glyphs) {
499        NPE_CHECK_RETURN_ZERO(env, paint);
500        NPE_CHECK_RETURN_ZERO(env, text);
501
502        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
503            doThrowAIOOBE(env);
504            return 0;
505        }
506        if (count == 0) {
507            return 0;
508        }
509        size_t glypthsLength = env->GetArrayLength(glyphs);
510        if ((size_t)count > glypthsLength) {
511            doThrowAIOOBE(env);
512            return 0;
513        }
514
515        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
516
517        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
518                text, start, count, contextCount, flags);
519        const jchar* shapedGlyphs = value->getGlyphs();
520        size_t glyphsCount = value->getGlyphsCount();
521        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
522
523        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
524        return glyphsCount;
525    }
526
527    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
528            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
529            jcharArray glyphs) {
530        const jchar* textArray = env->GetStringChars(text, NULL);
531        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
532                end - start, contextEnd - contextStart, flags, glyphs);
533        env->ReleaseStringChars(text, textArray);
534        return count;
535    }
536
537    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
538                                    jint start, jint count, jint contextCount, jint flags,
539                                    jfloatArray advances, jint advancesIndex) {
540        NPE_CHECK_RETURN_ZERO(env, paint);
541        NPE_CHECK_RETURN_ZERO(env, text);
542
543        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
544            doThrowAIOOBE(env);
545            return 0;
546        }
547        if (count == 0) {
548            return 0;
549        }
550        if (advances) {
551            size_t advancesLength = env->GetArrayLength(advances);
552            if ((size_t)count > advancesLength) {
553                doThrowAIOOBE(env);
554                return 0;
555            }
556        }
557        jfloat advancesArray[count];
558        jfloat totalAdvance = 0;
559
560        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
561                                       advancesArray, &totalAdvance);
562
563        if (advances != NULL) {
564            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
565        }
566        return totalAdvance;
567    }
568
569    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
570                                    jint start, jint count, jint contextCount, jint flags,
571                                    jfloatArray advances, jint advancesIndex) {
572        NPE_CHECK_RETURN_ZERO(env, paint);
573        NPE_CHECK_RETURN_ZERO(env, text);
574
575        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
576            doThrowAIOOBE(env);
577            return 0;
578        }
579        if (count == 0) {
580            return 0;
581        }
582        if (advances) {
583            size_t advancesLength = env->GetArrayLength(advances);
584            if ((size_t)count > advancesLength) {
585                doThrowAIOOBE(env);
586                return 0;
587            }
588        }
589
590        jfloat advancesArray[count];
591        jfloat totalAdvance = 0;
592
593        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
594                                       advancesArray, totalAdvance);
595
596        if (advances != NULL) {
597            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
598        }
599        return totalAdvance;
600    }
601
602    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
603            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
604            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
605        jchar* textArray = env->GetCharArrayElements(text, NULL);
606        jfloat result = (reserved == 0) ?
607                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
608                        count, contextCount, flags, advances, advancesIndex) :
609                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
610                        count, contextCount, flags, advances, advancesIndex);
611        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
612        return result;
613    }
614
615    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
616            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
617            jfloatArray advances, jint advancesIndex, jint reserved) {
618        const jchar* textArray = env->GetStringChars(text, NULL);
619        jfloat result = (reserved == 0) ?
620                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
621                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
622                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
623                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
624        env->ReleaseStringChars(text, textArray);
625        return result;
626    }
627
628    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
629            jint count, jint flags, jint offset, jint opt) {
630        jfloat scalarArray[count];
631
632        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
633                scalarArray, NULL /* dont need totalAdvance */);
634
635        jint pos = offset - start;
636        switch (opt) {
637        case AFTER:
638          if (pos < count) {
639            pos += 1;
640          }
641          // fall through
642        case AT_OR_AFTER:
643          while (pos < count && scalarArray[pos] == 0) {
644            ++pos;
645          }
646          break;
647        case BEFORE:
648          if (pos > 0) {
649            --pos;
650          }
651          // fall through
652        case AT_OR_BEFORE:
653          while (pos > 0 && scalarArray[pos] == 0) {
654            --pos;
655          }
656          break;
657        case AT:
658        default:
659          if (scalarArray[pos] == 0) {
660            pos = -1;
661          }
662          break;
663        }
664
665        if (pos != -1) {
666          pos += start;
667        }
668
669        return pos;
670    }
671
672    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
673            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
674        jchar* textArray = env->GetCharArrayElements(text, NULL);
675        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
676                offset, cursorOpt);
677        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
678        return result;
679    }
680
681    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
682            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
683        const jchar* textArray = env->GetStringChars(text, NULL);
684        jint result = doTextRunCursor(env, paint, textArray, contextStart,
685                contextEnd - contextStart, flags, offset, cursorOpt);
686        env->ReleaseStringChars(text, textArray);
687        return result;
688    }
689
690    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
691                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
692        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
693    }
694
695    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
696            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
697        const jchar* textArray = env->GetCharArrayElements(text, NULL);
698        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
699        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
700    }
701
702    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
703            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
704        const jchar* textArray = env->GetStringChars(text, NULL);
705        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
706        env->ReleaseStringChars(text, textArray);
707    }
708
709    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
710                               jfloat dx, jfloat dy, int color) {
711        NPE_CHECK_RETURN_VOID(env, jpaint);
712
713        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
714        if (radius <= 0) {
715            paint->setLooper(NULL);
716        }
717        else {
718            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
719                                                  SkFloatToScalar(dx),
720                                                  SkFloatToScalar(dy),
721                                                  (SkColor)color))->unref();
722        }
723    }
724
725    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
726                         int count, float maxWidth, jfloatArray jmeasured,
727                         SkPaint::TextBufferDirection tbd) {
728        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
729                text, 0, count, count, paint.getFlags());
730        if (value == NULL) {
731            return 0;
732        }
733        SkScalar     measured;
734        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
735                                   SkFloatToScalar(maxWidth), &measured, tbd);
736        SkASSERT((bytes & 1) == 0);
737
738        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
739            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
740            jfloat* array = autoMeasured.ptr();
741            array[0] = SkScalarToFloat(measured);
742        }
743        return bytes >> 1;
744    }
745
746    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
747            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
748        NPE_CHECK_RETURN_ZERO(env, jpaint);
749        NPE_CHECK_RETURN_ZERO(env, jtext);
750
751        SkPaint::TextBufferDirection tbd;
752        if (count < 0) {
753            tbd = SkPaint::kBackward_TextBufferDirection;
754            count = -count;
755        }
756        else {
757            tbd = SkPaint::kForward_TextBufferDirection;
758        }
759
760        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
761            doThrowAIOOBE(env);
762            return 0;
763        }
764
765        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
766        const jchar* text = env->GetCharArrayElements(jtext, NULL);
767        count = breakText(env, *paint, text + index, count, maxWidth,
768                          jmeasuredWidth, tbd);
769        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
770                                      JNI_ABORT);
771        return count;
772    }
773
774    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
775                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
776        NPE_CHECK_RETURN_ZERO(env, jpaint);
777        NPE_CHECK_RETURN_ZERO(env, jtext);
778
779        SkPaint::TextBufferDirection tbd = forwards ?
780                                        SkPaint::kForward_TextBufferDirection :
781                                        SkPaint::kBackward_TextBufferDirection;
782
783        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
784        int count = env->GetStringLength(jtext);
785        const jchar* text = env->GetStringChars(jtext, NULL);
786        count = breakText(env, *paint, text, count, maxWidth,
787                          jmeasuredWidth, tbd);
788        env->ReleaseStringChars(jtext, text);
789        return count;
790    }
791
792    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
793                             jobject bounds, const SkPaint& paint)
794    {
795        SkRect  r{0,0,0,0};
796        SkIRect ir;
797
798        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
799                text, 0, count, count, paint.getFlags());
800        if (value == NULL) {
801            return;
802        }
803        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
804        r.roundOut(&ir);
805        GraphicsJNI::irect_to_jrect(ir, env, bounds);
806    }
807
808    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
809                                jstring text, int start, int end, jobject bounds)
810    {
811        const jchar* textArray = env->GetStringChars(text, NULL);
812        doTextBounds(env, textArray + start, end - start, bounds, *paint);
813        env->ReleaseStringChars(text, textArray);
814    }
815
816    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
817                        jcharArray text, int index, int count, jobject bounds)
818    {
819        const jchar* textArray = env->GetCharArrayElements(text, NULL);
820        doTextBounds(env, textArray + index, count, bounds, *paint);
821        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
822                                      JNI_ABORT);
823    }
824
825};
826
827static JNINativeMethod methods[] = {
828    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
829    {"native_init","()I", (void*) SkPaintGlue::init},
830    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
831    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
832    {"native_set","(II)V", (void*) SkPaintGlue::assign},
833    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
834    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
835    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
836    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
837    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
838    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
839    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
840    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
841    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
842    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
843    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
844    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
845    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
846    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
847    {"getColor","()I", (void*) SkPaintGlue::getColor},
848    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
849    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
850    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
851    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
852    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
853    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
854    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
855    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
856    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
857    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
858    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
859    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
860    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
861    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
862    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
863    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
864    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
865    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
866    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
867    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
868    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
869    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
870    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
871    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
872    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
873    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
874    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
875    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
876    {"ascent","()F", (void*) SkPaintGlue::ascent},
877    {"descent","()F", (void*) SkPaintGlue::descent},
878    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
879    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
880    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
881    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
882    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
883    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
884    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
885    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
886    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
887    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
888        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
889    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
890        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
891
892
893    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
894        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
895    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
896    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
897        (void*) SkPaintGlue::getTextRunCursor__String},
898    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
899    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
900    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
901                                        (void*) SkPaintGlue::getStringBounds },
902    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
903                                    (void*) SkPaintGlue::getCharArrayBounds },
904    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
905};
906
907static jfieldID req_fieldID(jfieldID id) {
908    SkASSERT(id);
909    return id;
910}
911
912int register_android_graphics_Paint(JNIEnv* env) {
913    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
914    SkASSERT(gFontMetrics_class);
915    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
916
917    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
918    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
919    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
920    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
921    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
922
923    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
924    SkASSERT(gFontMetricsInt_class);
925    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
926
927    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
928    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
929    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
930    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
931    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
932
933    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
934        sizeof(methods) / sizeof(methods[0]));
935    return result;
936}
937
938}
939