Paint.cpp revision d686d76814f18061e06995df0d5de9feb9f70a7e 
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
26#include "SkBlurDrawLooper.h"
27#include "SkColorFilter.h"
28#include "SkMaskFilter.h"
29#include "SkRasterizer.h"
30#include "SkShader.h"
31#include "SkTypeface.h"
32#include "SkXfermode.h"
33#include "unicode/ushape.h"
34#include "TextLayout.h"
35
36// temporary for debugging
37#include <Caches.h>
38#include <utils/Log.h>
39
40namespace android {
41
42struct JMetricsID {
43    jfieldID    top;
44    jfieldID    ascent;
45    jfieldID    descent;
46    jfieldID    bottom;
47    jfieldID    leading;
48};
49
50static jclass   gFontMetrics_class;
51static JMetricsID gFontMetrics_fieldID;
52
53static jclass   gFontMetricsInt_class;
54static JMetricsID gFontMetricsInt_fieldID;
55
56static void defaultSettingsForAndroid(SkPaint* paint) {
57    // utf16 is required for java
58    paint->setTextEncoding(SkPaint::kUTF16_TextEncoding);
59}
60
61class SkPaintGlue {
62public:
63    enum MoveOpt {
64        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
65    };
66
67    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
68        delete obj;
69    }
70
71    static SkPaint* init(JNIEnv* env, jobject clazz) {
72        SkPaint* obj = new SkPaint();
73        defaultSettingsForAndroid(obj);
74        return obj;
75    }
76
77    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
78        SkPaint* obj = new SkPaint(*paint);
79        return obj;
80    }
81
82    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
83        obj->reset();
84        defaultSettingsForAndroid(obj);
85    }
86
87    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
88        *dst = *src;
89    }
90
91    static jint getFlags(JNIEnv* env, jobject paint) {
92        NPE_CHECK_RETURN_ZERO(env, paint);
93        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
94    }
95
96    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
97        NPE_CHECK_RETURN_VOID(env, paint);
98        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
99    }
100
101    static jint getHinting(JNIEnv* env, jobject paint) {
102        NPE_CHECK_RETURN_ZERO(env, paint);
103        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
104                == SkPaint::kNo_Hinting ? 0 : 1;
105    }
106
107    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
108        NPE_CHECK_RETURN_VOID(env, paint);
109        GraphicsJNI::getNativePaint(env, paint)->setHinting(
110                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kSlight_Hinting);
111    }
112
113    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
114        NPE_CHECK_RETURN_VOID(env, paint);
115        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
116    }
117
118    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
119        NPE_CHECK_RETURN_VOID(env, paint);
120        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
121    }
122
123    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
124        NPE_CHECK_RETURN_VOID(env, paint);
125        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
126    }
127
128    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
129        NPE_CHECK_RETURN_VOID(env, paint);
130        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
131    }
132
133    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
134        NPE_CHECK_RETURN_VOID(env, paint);
135        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
136    }
137
138    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
139        NPE_CHECK_RETURN_VOID(env, paint);
140        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
141    }
142
143    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
144        NPE_CHECK_RETURN_VOID(env, paint);
145        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
146    }
147
148    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
149        NPE_CHECK_RETURN_VOID(env, paint);
150        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
151    }
152
153    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
154        return obj->getStyle();
155    }
156
157    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
158        obj->setStyle(style);
159    }
160
161    static jint getColor(JNIEnv* env, jobject paint) {
162        NPE_CHECK_RETURN_ZERO(env, paint);
163        return GraphicsJNI::getNativePaint(env, paint)->getColor();
164    }
165
166    static jint getAlpha(JNIEnv* env, jobject paint) {
167        NPE_CHECK_RETURN_ZERO(env, paint);
168        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
169    }
170
171    static void setColor(JNIEnv* env, jobject paint, jint color) {
172        NPE_CHECK_RETURN_VOID(env, paint);
173        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
174    }
175
176    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
177        NPE_CHECK_RETURN_VOID(env, paint);
178        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
179    }
180
181    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
182        NPE_CHECK_RETURN_ZERO(env, paint);
183        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
184    }
185
186    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
187        NPE_CHECK_RETURN_VOID(env, paint);
188        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
189    }
190
191    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
192        NPE_CHECK_RETURN_ZERO(env, paint);
193        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
194    }
195
196    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
197        NPE_CHECK_RETURN_VOID(env, paint);
198        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
199    }
200
201    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
202        return obj->getStrokeCap();
203    }
204
205    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
206        obj->setStrokeCap(cap);
207    }
208
209    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
210        return obj->getStrokeJoin();
211    }
212
213    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
214        obj->setStrokeJoin(join);
215    }
216
217    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
218        return obj->getFillPath(*src, dst);
219    }
220
221    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
222        return obj->setShader(shader);
223    }
224
225    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
226        return obj->setColorFilter(filter);
227    }
228
229    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
230        return obj->setXfermode(xfermode);
231    }
232
233    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
234        return obj->setPathEffect(effect);
235    }
236
237    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
238        return obj->setMaskFilter(maskfilter);
239    }
240
241    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
242        return obj->setTypeface(typeface);
243    }
244
245    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
246        return obj->setRasterizer(rasterizer);
247    }
248
249    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
250        return obj->getTextAlign();
251    }
252
253    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
254        obj->setTextAlign(align);
255    }
256
257    static jfloat getTextSize(JNIEnv* env, jobject paint) {
258        NPE_CHECK_RETURN_ZERO(env, paint);
259        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
260    }
261
262    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
263        NPE_CHECK_RETURN_VOID(env, paint);
264        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
265    }
266
267    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
268        NPE_CHECK_RETURN_ZERO(env, paint);
269        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
270    }
271
272    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
273        NPE_CHECK_RETURN_VOID(env, paint);
274        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
275    }
276
277    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
278        NPE_CHECK_RETURN_ZERO(env, paint);
279        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
280    }
281
282    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
283        NPE_CHECK_RETURN_VOID(env, paint);
284        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
285    }
286
287    static jfloat ascent(JNIEnv* env, jobject paint) {
288        NPE_CHECK_RETURN_ZERO(env, paint);
289        SkPaint::FontMetrics    metrics;
290        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
291        return SkScalarToFloat(metrics.fAscent);
292    }
293
294    static jfloat descent(JNIEnv* env, jobject paint) {
295        NPE_CHECK_RETURN_ZERO(env, paint);
296        SkPaint::FontMetrics    metrics;
297        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
298        return SkScalarToFloat(metrics.fDescent);
299    }
300
301    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
302        NPE_CHECK_RETURN_ZERO(env, paint);
303        SkPaint::FontMetrics metrics;
304        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
305
306        if (metricsObj) {
307            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
308            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
309            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
310            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
311            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
312            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
313        }
314        return SkScalarToFloat(spacing);
315    }
316
317    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
318        NPE_CHECK_RETURN_ZERO(env, paint);
319        SkPaint::FontMetrics metrics;
320
321        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
322        int ascent = SkScalarRound(metrics.fAscent);
323        int descent = SkScalarRound(metrics.fDescent);
324        int leading = SkScalarRound(metrics.fLeading);
325
326        if (metricsObj) {
327            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
328            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
329            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
330            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
331            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
332            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
333        }
334        return descent - ascent + leading;
335    }
336
337    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
338        NPE_CHECK_RETURN_ZERO(env, jpaint);
339        NPE_CHECK_RETURN_ZERO(env, text);
340
341        size_t textLength = env->GetArrayLength(text);
342        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
343            doThrowAIOOBE(env);
344            return 0;
345        }
346        if (count == 0) {
347            return 0;
348        }
349
350        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
351        const jchar* textArray = env->GetCharArrayElements(text, NULL);
352        jfloat result = 0;
353#if RTL_USE_HARFBUZZ
354        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
355                paint->getFlags(), NULL /* dont need all advances */, &result);
356#else
357        // we double count, since measureText wants a byteLength
358        SkScalar width = paint->measureText(textArray + index, count << 1);
359        result = SkScalarToFloat(width);
360#endif
361        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
362        return result;
363    }
364
365    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
366        NPE_CHECK_RETURN_ZERO(env, jpaint);
367        NPE_CHECK_RETURN_ZERO(env, text);
368
369        size_t textLength = env->GetStringLength(text);
370        int count = end - start;
371        if ((start | count) < 0 || (size_t)end > textLength) {
372            doThrowAIOOBE(env);
373            return 0;
374        }
375        if (count == 0) {
376            return 0;
377        }
378
379        const jchar* textArray = env->GetStringChars(text, NULL);
380        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
381        jfloat width = 0;
382
383#if RTL_USE_HARFBUZZ
384        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
385                paint->getFlags(), NULL /* dont need all advances */, &width);
386#else
387
388        width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
389#endif
390        env->ReleaseStringChars(text, textArray);
391        return width;
392    }
393
394    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
395        NPE_CHECK_RETURN_ZERO(env, jpaint);
396        NPE_CHECK_RETURN_ZERO(env, text);
397
398        size_t textLength = env->GetStringLength(text);
399        if (textLength == 0) {
400            return 0;
401        }
402
403        const jchar* textArray = env->GetStringChars(text, NULL);
404        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
405        jfloat width = 0;
406
407#if RTL_USE_HARFBUZZ
408        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
409                paint->getFlags(), NULL /* dont need all advances */, &width);
410#else
411        width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
412#endif
413        env->ReleaseStringChars(text, textArray);
414        return width;
415    }
416
417    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
418        NPE_CHECK_RETURN_ZERO(env, paint);
419        NPE_CHECK_RETURN_ZERO(env, text);
420
421        if (count < 0 || !widths) {
422            doThrowAIOOBE(env);
423            return 0;
424        }
425        if (count == 0) {
426            return 0;
427        }
428        size_t widthsLength = env->GetArrayLength(widths);
429        if ((size_t)count > widthsLength) {
430            doThrowAIOOBE(env);
431            return 0;
432        }
433
434        AutoJavaFloatArray autoWidths(env, widths, count);
435        jfloat* widthsArray = autoWidths.ptr();
436
437#if RTL_USE_HARFBUZZ
438        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
439                paint->getFlags(), widthsArray, NULL);
440#else
441        SkScalar* scalarArray = (SkScalar*)widthsArray;
442
443        count = paint->getTextWidths(text, count << 1, scalarArray);
444        for (int i = 0; i < count; i++) {
445            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
446        }
447#endif
448        return count;
449    }
450
451    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
452        const jchar* textArray = env->GetCharArrayElements(text, NULL);
453        count = dotextwidths(env, paint, textArray + index, count, widths);
454        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
455                                      JNI_ABORT);
456        return count;
457    }
458
459    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
460            int start, int end, jfloatArray widths) {
461        const jchar* textArray = env->GetStringChars(text, NULL);
462        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
463        env->ReleaseStringChars(text, textArray);
464        return count;
465    }
466
467    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
468            jint contextCount, jint flags, jcharArray glyphs) {
469        NPE_CHECK_RETURN_ZERO(env, paint);
470        NPE_CHECK_RETURN_ZERO(env, text);
471
472        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
473            doThrowAIOOBE(env);
474            return 0;
475        }
476        if (count == 0) {
477            return 0;
478        }
479        size_t glypthsLength = env->GetArrayLength(glyphs);
480        if ((size_t)count > glypthsLength) {
481            doThrowAIOOBE(env);
482            return 0;
483        }
484
485        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
486        HB_ShaperItem shaperItem;
487        HB_FontRec font;
488        FontData fontData;
489        TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text,
490                contextCount, flags);
491
492        int glyphCount = shaperItem.num_glyphs;
493        for (int i = 0; i < glyphCount; i++) {
494            glyphsArray[i] = (jchar) shaperItem.glyphs[i];
495        }
496        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
497        return glyphCount;
498    }
499
500    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
501            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
502            jcharArray glyphs) {
503        const jchar* textArray = env->GetStringChars(text, NULL);
504        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
505                end - start, contextEnd - contextStart, flags, glyphs);
506        env->ReleaseStringChars(text, textArray);
507        return count;
508    }
509
510    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
511                                    jint start, jint count, jint contextCount, jint flags,
512                                    jfloatArray advances, jint advancesIndex) {
513        NPE_CHECK_RETURN_ZERO(env, paint);
514        NPE_CHECK_RETURN_ZERO(env, text);
515
516        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
517            doThrowAIOOBE(env);
518            return 0;
519        }
520        if (count == 0) {
521            return 0;
522        }
523        if (advances) {
524            size_t advancesLength = env->GetArrayLength(advances);
525            if ((size_t)count > advancesLength) {
526                doThrowAIOOBE(env);
527                return 0;
528            }
529        }
530        jfloat advancesArray[count];
531        jfloat totalAdvance = 0;
532
533        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
534                                       advancesArray, &totalAdvance);
535
536        if (advances != NULL) {
537            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
538        }
539        return totalAdvance;
540    }
541
542    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
543                                    jint start, jint count, jint contextCount, jint flags,
544                                    jfloatArray advances, jint advancesIndex) {
545        NPE_CHECK_RETURN_ZERO(env, paint);
546        NPE_CHECK_RETURN_ZERO(env, text);
547
548        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
549            doThrowAIOOBE(env);
550            return 0;
551        }
552        if (count == 0) {
553            return 0;
554        }
555        if (advances) {
556            size_t advancesLength = env->GetArrayLength(advances);
557            if ((size_t)count > advancesLength) {
558                doThrowAIOOBE(env);
559                return 0;
560            }
561        }
562
563        jfloat advancesArray[count];
564        jfloat totalAdvance = 0;
565
566        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
567                                       advancesArray, totalAdvance);
568
569        if (advances != NULL) {
570            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
571        }
572        return totalAdvance;
573    }
574
575    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
576            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
577            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
578        jchar* textArray = env->GetCharArrayElements(text, NULL);
579        jfloat result = (reserved == 0) ?
580                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
581                        count, contextCount, flags, advances, advancesIndex) :
582                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
583                        count, contextCount, flags, advances, advancesIndex);
584        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
585        return result;
586    }
587
588    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
589            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
590            jfloatArray advances, jint advancesIndex, jint reserved) {
591        const jchar* textArray = env->GetStringChars(text, NULL);
592        jfloat result = (reserved == 0) ?
593                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
594                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
595                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
596                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
597        env->ReleaseStringChars(text, textArray);
598        return result;
599    }
600
601    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
602            jint count, jint flags, jint offset, jint opt) {
603#if RTL_USE_HARFBUZZ
604        jfloat scalarArray[count];
605        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
606                scalarArray, NULL);
607#else
608        SkScalar scalarArray[count];
609        jchar buffer[count];
610
611        // this is where we'd call harfbuzz
612        // for now we just use ushape.c and widths returned from skia
613
614        int widths;
615        if (flags & 0x1) { // rtl, call arabic shaping in case
616            UErrorCode status = U_ZERO_ERROR;
617            // Use fixed length since we need to keep start and count valid
618            u_shapeArabic(text + start, count, buffer, count,
619                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
620                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
621            // we shouldn't fail unless there's an out of memory condition,
622            // in which case we're hosed anyway
623            for (int i = 0; i < count; ++i) {
624              if (buffer[i] == 0xffff) {
625                buffer[i] = 0x200b; // zero-width-space for skia
626              }
627            }
628            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
629        } else {
630            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
631        }
632
633        if (widths < count) {
634            // Skia operates on code points, not code units, so surrogate pairs return only one
635            // value. Expand the result so we have one value per UTF-16 code unit.
636
637            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
638            // leaving the remaining widths zero.  Not nice.
639            const jchar *chars = text + start;
640            for (int i = count, p = widths - 1; --i > p;) {
641                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
642                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
643                    scalarArray[i] = 0;
644                } else {
645                  scalarArray[i] = scalarArray[--p];
646                }
647            }
648        }
649#endif
650        jint pos = offset - start;
651        switch (opt) {
652        case AFTER:
653          if (pos < count) {
654            pos += 1;
655          }
656          // fall through
657        case AT_OR_AFTER:
658          while (pos < count && scalarArray[pos] == 0) {
659            ++pos;
660          }
661          break;
662        case BEFORE:
663          if (pos > 0) {
664            --pos;
665          }
666          // fall through
667        case AT_OR_BEFORE:
668          while (pos > 0 && scalarArray[pos] == 0) {
669            --pos;
670          }
671          break;
672        case AT:
673        default:
674          if (scalarArray[pos] == 0) {
675            pos = -1;
676          }
677          break;
678        }
679
680        if (pos != -1) {
681          pos += start;
682        }
683
684        return pos;
685    }
686
687    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
688            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
689        jchar* textArray = env->GetCharArrayElements(text, NULL);
690        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
691                offset, cursorOpt);
692        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
693        return result;
694    }
695
696    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
697            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
698        const jchar* textArray = env->GetStringChars(text, NULL);
699        jint result = doTextRunCursor(env, paint, textArray, contextStart,
700                contextEnd - contextStart, flags, offset, cursorOpt);
701        env->ReleaseStringChars(text, textArray);
702        return result;
703    }
704
705    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
706                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
707        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
708    }
709
710    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
711            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
712        const jchar* textArray = env->GetCharArrayElements(text, NULL);
713        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
714        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
715    }
716
717    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
718            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
719        const jchar* textArray = env->GetStringChars(text, NULL);
720        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
721        env->ReleaseStringChars(text, textArray);
722    }
723
724    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
725                               jfloat dx, jfloat dy, int color) {
726        NPE_CHECK_RETURN_VOID(env, jpaint);
727
728        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
729        if (radius <= 0) {
730            paint->setLooper(NULL);
731        }
732        else {
733            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
734                                                  SkFloatToScalar(dx),
735                                                  SkFloatToScalar(dy),
736                                                  (SkColor)color))->unref();
737        }
738    }
739
740    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
741                         int count, float maxWidth, jfloatArray jmeasured,
742                         SkPaint::TextBufferDirection tbd) {
743        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
744
745        SkScalar     measured;
746        size_t       bytes = paint.breakText(text, count << 1,
747                                   SkFloatToScalar(maxWidth), &measured, tbd);
748        SkASSERT((bytes & 1) == 0);
749
750        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
751            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
752            jfloat* array = autoMeasured.ptr();
753            array[0] = SkScalarToFloat(measured);
754        }
755        return bytes >> 1;
756    }
757
758    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
759            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
760        NPE_CHECK_RETURN_ZERO(env, jpaint);
761        NPE_CHECK_RETURN_ZERO(env, jtext);
762
763        SkPaint::TextBufferDirection tbd;
764        if (count < 0) {
765            tbd = SkPaint::kBackward_TextBufferDirection;
766            count = -count;
767        }
768        else {
769            tbd = SkPaint::kForward_TextBufferDirection;
770        }
771
772        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
773            doThrowAIOOBE(env);
774            return 0;
775        }
776
777        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
778        const jchar* text = env->GetCharArrayElements(jtext, NULL);
779        count = breakText(env, *paint, text + index, count, maxWidth,
780                          jmeasuredWidth, tbd);
781        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
782                                      JNI_ABORT);
783        return count;
784    }
785
786    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
787                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
788        NPE_CHECK_RETURN_ZERO(env, jpaint);
789        NPE_CHECK_RETURN_ZERO(env, jtext);
790
791        SkPaint::TextBufferDirection tbd = forwards ?
792                                        SkPaint::kForward_TextBufferDirection :
793                                        SkPaint::kBackward_TextBufferDirection;
794
795        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
796        int count = env->GetStringLength(jtext);
797        const jchar* text = env->GetStringChars(jtext, NULL);
798        count = breakText(env, *paint, text, count, maxWidth,
799                          jmeasuredWidth, tbd);
800        env->ReleaseStringChars(jtext, text);
801        return count;
802    }
803
804    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
805                             jobject bounds, const SkPaint& paint)
806    {
807        SkRect  r;
808        SkIRect ir;
809
810        paint.measureText(text, count << 1, &r);
811        r.roundOut(&ir);
812        GraphicsJNI::irect_to_jrect(ir, env, bounds);
813    }
814
815    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
816                                jstring text, int start, int end, jobject bounds)
817    {
818        const jchar* textArray = env->GetStringChars(text, NULL);
819        doTextBounds(env, textArray + start, end - start, bounds, *paint);
820        env->ReleaseStringChars(text, textArray);
821    }
822
823    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
824                        jcharArray text, int index, int count, jobject bounds)
825    {
826        const jchar* textArray = env->GetCharArrayElements(text, NULL);
827        doTextBounds(env, textArray + index, count, bounds, *paint);
828        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
829                                      JNI_ABORT);
830    }
831
832};
833
834static JNINativeMethod methods[] = {
835    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
836    {"native_init","()I", (void*) SkPaintGlue::init},
837    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
838    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
839    {"native_set","(II)V", (void*) SkPaintGlue::assign},
840    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
841    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
842    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
843    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
844    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
845    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
846    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
847    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
848    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
849    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
850    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
851    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
852    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
853    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
854    {"getColor","()I", (void*) SkPaintGlue::getColor},
855    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
856    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
857    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
858    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
859    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
860    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
861    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
862    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
863    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
864    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
865    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
866    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
867    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
868    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
869    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
870    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
871    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
872    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
873    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
874    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
875    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
876    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
877    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
878    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
879    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
880    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
881    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
882    {"ascent","()F", (void*) SkPaintGlue::ascent},
883    {"descent","()F", (void*) SkPaintGlue::descent},
884    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
885    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
886    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
887    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
888    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
889    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
890    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
891    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
892    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
893    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
894        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
895    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
896        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
897
898
899    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
900        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
901    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
902    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
903        (void*) SkPaintGlue::getTextRunCursor__String},
904    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
905    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
906    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
907                                        (void*) SkPaintGlue::getStringBounds },
908    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
909                                    (void*) SkPaintGlue::getCharArrayBounds },
910    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
911};
912
913static jfieldID req_fieldID(jfieldID id) {
914    SkASSERT(id);
915    return id;
916}
917
918int register_android_graphics_Paint(JNIEnv* env) {
919    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
920    SkASSERT(gFontMetrics_class);
921    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
922
923    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
924    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
925    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
926    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
927    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
928
929    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
930    SkASSERT(gFontMetricsInt_class);
931    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
932
933    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
934    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
935    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
936    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
937    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
938
939    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
940        sizeof(methods) / sizeof(methods[0]));
941    return result;
942}
943
944}
945