Paint.cpp revision 9c418dbc56efd334c68872d281f75138e16eae46 
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        jfloat totalAdvance;
439
440        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
441                paint->getFlags(), widthsArray, totalAdvance);
442#else
443        SkScalar* scalarArray = (SkScalar*)widthsArray;
444
445        count = paint->getTextWidths(text, count << 1, scalarArray);
446        for (int i = 0; i < count; i++) {
447            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
448        }
449#endif
450        return count;
451    }
452
453    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
454        const jchar* textArray = env->GetCharArrayElements(text, NULL);
455        count = dotextwidths(env, paint, textArray + index, count, widths);
456        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
457                                      JNI_ABORT);
458        return count;
459    }
460
461    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
462            int start, int end, jfloatArray widths) {
463        const jchar* textArray = env->GetStringChars(text, NULL);
464        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
465        env->ReleaseStringChars(text, textArray);
466        return count;
467    }
468
469    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
470            jint contextCount, jint flags, jcharArray glyphs) {
471        NPE_CHECK_RETURN_ZERO(env, paint);
472        NPE_CHECK_RETURN_ZERO(env, text);
473
474        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
475            doThrowAIOOBE(env);
476            return 0;
477        }
478        if (count == 0) {
479            return 0;
480        }
481        size_t glypthsLength = env->GetArrayLength(glyphs);
482        if ((size_t)count > glypthsLength) {
483            doThrowAIOOBE(env);
484            return 0;
485        }
486
487        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
488        HB_ShaperItem shaperItem;
489        HB_FontRec font;
490        FontData fontData;
491        TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text,
492                start, count, contextCount, flags);
493
494        int glyphCount = shaperItem.num_glyphs;
495        for (int i = 0; i < glyphCount; i++) {
496            glyphsArray[i] = (jchar) shaperItem.glyphs[i];
497        }
498        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
499        return glyphCount;
500    }
501
502    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
503            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
504            jcharArray glyphs) {
505        const jchar* textArray = env->GetStringChars(text, NULL);
506        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
507                end - start, contextEnd - contextStart, flags, glyphs);
508        env->ReleaseStringChars(text, textArray);
509        return count;
510    }
511
512    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
513                                    jint start, jint count, jint contextCount, jint flags,
514                                    jfloatArray advances, jint advancesIndex) {
515        NPE_CHECK_RETURN_ZERO(env, paint);
516        NPE_CHECK_RETURN_ZERO(env, text);
517
518        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
519            doThrowAIOOBE(env);
520            return 0;
521        }
522        if (count == 0) {
523            return 0;
524        }
525        if (advances) {
526            size_t advancesLength = env->GetArrayLength(advances);
527            if ((size_t)count > advancesLength) {
528                doThrowAIOOBE(env);
529                return 0;
530            }
531        }
532        jfloat advancesArray[count];
533        jfloat totalAdvance = 0;
534
535        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
536                                       advancesArray, totalAdvance);
537
538        if (advances != NULL) {
539            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
540        }
541        return totalAdvance;
542    }
543
544    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
545                                    jint start, jint count, jint contextCount, jint flags,
546                                    jfloatArray advances, jint advancesIndex) {
547        NPE_CHECK_RETURN_ZERO(env, paint);
548        NPE_CHECK_RETURN_ZERO(env, text);
549
550        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
551            doThrowAIOOBE(env);
552            return 0;
553        }
554        if (count == 0) {
555            return 0;
556        }
557        if (advances) {
558            size_t advancesLength = env->GetArrayLength(advances);
559            if ((size_t)count > advancesLength) {
560                doThrowAIOOBE(env);
561                return 0;
562            }
563        }
564
565        jfloat advancesArray[count];
566        jfloat totalAdvance = 0;
567
568        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
569                                       advancesArray, totalAdvance);
570
571        if (advances != NULL) {
572            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
573        }
574        return totalAdvance;
575    }
576
577    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
578            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
579            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
580        jchar* textArray = env->GetCharArrayElements(text, NULL);
581        jfloat result = (reserved == 0) ?
582                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
583                        count, contextCount, flags, advances, advancesIndex) :
584                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
585                        count, contextCount, flags, advances, advancesIndex);
586        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
587        return result;
588    }
589
590    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
591            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
592            jfloatArray advances, jint advancesIndex, jint reserved) {
593        const jchar* textArray = env->GetStringChars(text, NULL);
594        jfloat result = (reserved == 0) ?
595                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
596                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
597                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
598                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
599        env->ReleaseStringChars(text, textArray);
600        return result;
601    }
602
603    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
604            jint count, jint flags, jint offset, jint opt) {
605#if RTL_USE_HARFBUZZ
606        jfloat scalarArray[count];
607        jfloat totalAdvance = 0;
608
609        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
610                scalarArray, totalAdvance);
611#else
612        SkScalar scalarArray[count];
613        jchar buffer[count];
614
615        // this is where we'd call harfbuzz
616        // for now we just use ushape.c and widths returned from skia
617
618        int widths;
619        if (flags & 0x1) { // rtl, call arabic shaping in case
620            UErrorCode status = U_ZERO_ERROR;
621            // Use fixed length since we need to keep start and count valid
622            u_shapeArabic(text + start, count, buffer, count,
623                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
624                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
625            // we shouldn't fail unless there's an out of memory condition,
626            // in which case we're hosed anyway
627            for (int i = 0; i < count; ++i) {
628              if (buffer[i] == 0xffff) {
629                buffer[i] = 0x200b; // zero-width-space for skia
630              }
631            }
632            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
633        } else {
634            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
635        }
636
637        if (widths < count) {
638            // Skia operates on code points, not code units, so surrogate pairs return only one
639            // value. Expand the result so we have one value per UTF-16 code unit.
640
641            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
642            // leaving the remaining widths zero.  Not nice.
643            const jchar *chars = text + start;
644            for (int i = count, p = widths - 1; --i > p;) {
645                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
646                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
647                    scalarArray[i] = 0;
648                } else {
649                  scalarArray[i] = scalarArray[--p];
650                }
651            }
652        }
653#endif
654        jint pos = offset - start;
655        switch (opt) {
656        case AFTER:
657          if (pos < count) {
658            pos += 1;
659          }
660          // fall through
661        case AT_OR_AFTER:
662          while (pos < count && scalarArray[pos] == 0) {
663            ++pos;
664          }
665          break;
666        case BEFORE:
667          if (pos > 0) {
668            --pos;
669          }
670          // fall through
671        case AT_OR_BEFORE:
672          while (pos > 0 && scalarArray[pos] == 0) {
673            --pos;
674          }
675          break;
676        case AT:
677        default:
678          if (scalarArray[pos] == 0) {
679            pos = -1;
680          }
681          break;
682        }
683
684        if (pos != -1) {
685          pos += start;
686        }
687
688        return pos;
689    }
690
691    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
692            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
693        jchar* textArray = env->GetCharArrayElements(text, NULL);
694        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
695                offset, cursorOpt);
696        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
697        return result;
698    }
699
700    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
701            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
702        const jchar* textArray = env->GetStringChars(text, NULL);
703        jint result = doTextRunCursor(env, paint, textArray, contextStart,
704                contextEnd - contextStart, flags, offset, cursorOpt);
705        env->ReleaseStringChars(text, textArray);
706        return result;
707    }
708
709    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
710                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
711        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
712    }
713
714    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
715            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
716        const jchar* textArray = env->GetCharArrayElements(text, NULL);
717        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
718        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
719    }
720
721    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
722            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
723        const jchar* textArray = env->GetStringChars(text, NULL);
724        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
725        env->ReleaseStringChars(text, textArray);
726    }
727
728    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
729                               jfloat dx, jfloat dy, int color) {
730        NPE_CHECK_RETURN_VOID(env, jpaint);
731
732        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
733        if (radius <= 0) {
734            paint->setLooper(NULL);
735        }
736        else {
737            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
738                                                  SkFloatToScalar(dx),
739                                                  SkFloatToScalar(dy),
740                                                  (SkColor)color))->unref();
741        }
742    }
743
744    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
745                         int count, float maxWidth, jfloatArray jmeasured,
746                         SkPaint::TextBufferDirection tbd) {
747        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
748
749        SkScalar     measured;
750        size_t       bytes = paint.breakText(text, count << 1,
751                                   SkFloatToScalar(maxWidth), &measured, tbd);
752        SkASSERT((bytes & 1) == 0);
753
754        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
755            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
756            jfloat* array = autoMeasured.ptr();
757            array[0] = SkScalarToFloat(measured);
758        }
759        return bytes >> 1;
760    }
761
762    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
763            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
764        NPE_CHECK_RETURN_ZERO(env, jpaint);
765        NPE_CHECK_RETURN_ZERO(env, jtext);
766
767        SkPaint::TextBufferDirection tbd;
768        if (count < 0) {
769            tbd = SkPaint::kBackward_TextBufferDirection;
770            count = -count;
771        }
772        else {
773            tbd = SkPaint::kForward_TextBufferDirection;
774        }
775
776        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
777            doThrowAIOOBE(env);
778            return 0;
779        }
780
781        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
782        const jchar* text = env->GetCharArrayElements(jtext, NULL);
783        count = breakText(env, *paint, text + index, count, maxWidth,
784                          jmeasuredWidth, tbd);
785        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
786                                      JNI_ABORT);
787        return count;
788    }
789
790    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
791                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
792        NPE_CHECK_RETURN_ZERO(env, jpaint);
793        NPE_CHECK_RETURN_ZERO(env, jtext);
794
795        SkPaint::TextBufferDirection tbd = forwards ?
796                                        SkPaint::kForward_TextBufferDirection :
797                                        SkPaint::kBackward_TextBufferDirection;
798
799        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
800        int count = env->GetStringLength(jtext);
801        const jchar* text = env->GetStringChars(jtext, NULL);
802        count = breakText(env, *paint, text, count, maxWidth,
803                          jmeasuredWidth, tbd);
804        env->ReleaseStringChars(jtext, text);
805        return count;
806    }
807
808    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
809                             jobject bounds, const SkPaint& paint)
810    {
811        SkRect  r;
812        SkIRect ir;
813
814        paint.measureText(text, count << 1, &r);
815        r.roundOut(&ir);
816        GraphicsJNI::irect_to_jrect(ir, env, bounds);
817    }
818
819    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
820                                jstring text, int start, int end, jobject bounds)
821    {
822        const jchar* textArray = env->GetStringChars(text, NULL);
823        doTextBounds(env, textArray + start, end - start, bounds, *paint);
824        env->ReleaseStringChars(text, textArray);
825    }
826
827    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
828                        jcharArray text, int index, int count, jobject bounds)
829    {
830        const jchar* textArray = env->GetCharArrayElements(text, NULL);
831        doTextBounds(env, textArray + index, count, bounds, *paint);
832        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
833                                      JNI_ABORT);
834    }
835
836};
837
838static JNINativeMethod methods[] = {
839    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
840    {"native_init","()I", (void*) SkPaintGlue::init},
841    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
842    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
843    {"native_set","(II)V", (void*) SkPaintGlue::assign},
844    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
845    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
846    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
847    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
848    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
849    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
850    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
851    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
852    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
853    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
854    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
855    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
856    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
857    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
858    {"getColor","()I", (void*) SkPaintGlue::getColor},
859    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
860    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
861    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
862    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
863    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
864    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
865    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
866    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
867    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
868    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
869    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
870    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
871    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
872    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
873    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
874    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
875    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
876    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
877    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
878    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
879    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
880    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
881    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
882    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
883    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
884    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
885    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
886    {"ascent","()F", (void*) SkPaintGlue::ascent},
887    {"descent","()F", (void*) SkPaintGlue::descent},
888    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
889    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
890    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
891    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
892    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
893    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
894    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
895    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
896    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
897    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
898        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
899    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
900        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
901
902
903    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
904        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
905    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
906    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
907        (void*) SkPaintGlue::getTextRunCursor__String},
908    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
909    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
910    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
911                                        (void*) SkPaintGlue::getStringBounds },
912    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
913                                    (void*) SkPaintGlue::getCharArrayBounds },
914    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
915};
916
917static jfieldID req_fieldID(jfieldID id) {
918    SkASSERT(id);
919    return id;
920}
921
922int register_android_graphics_Paint(JNIEnv* env) {
923    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
924    SkASSERT(gFontMetrics_class);
925    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
926
927    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
928    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
929    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
930    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
931    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
932
933    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
934    SkASSERT(gFontMetricsInt_class);
935    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
936
937    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
938    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
939    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
940    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
941    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
942
943    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
944        sizeof(methods) / sizeof(methods[0]));
945    return result;
946}
947
948}
949