Paint.cpp revision 8870538f7c8d32187255707bc3217bd3625d397e 
1/* libs/android_runtime/android/graphics/Paint.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "Paint"
19
20#include <utils/Log.h>
21
22#include "jni.h"
23#include "GraphicsJNI.h"
24#include <android_runtime/AndroidRuntime.h>
25#include <ScopedUtfChars.h>
26
27#include "SkBlurDrawLooper.h"
28#include "SkColorFilter.h"
29#include "SkMaskFilter.h"
30#include "SkRasterizer.h"
31#include "SkShader.h"
32#include "SkTypeface.h"
33#include "SkXfermode.h"
34#include "unicode/uloc.h"
35#include "unicode/ushape.h"
36#include "TextLayout.h"
37
38// temporary for debugging
39#include <Caches.h>
40#include <utils/Log.h>
41
42namespace android {
43
44struct JMetricsID {
45    jfieldID    top;
46    jfieldID    ascent;
47    jfieldID    descent;
48    jfieldID    bottom;
49    jfieldID    leading;
50};
51
52static jclass   gFontMetrics_class;
53static JMetricsID gFontMetrics_fieldID;
54
55static jclass   gFontMetricsInt_class;
56static JMetricsID gFontMetricsInt_fieldID;
57
58static void defaultSettingsForAndroid(SkPaint* paint) {
59    // GlyphID encoding is required because we are using Harfbuzz shaping
60    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
61
62    SkPaintOptionsAndroid paintOpts = paint->getPaintOptionsAndroid();
63    paintOpts.setUseFontFallbacks(true);
64    paint->setPaintOptionsAndroid(paintOpts);
65}
66
67class SkPaintGlue {
68public:
69    enum MoveOpt {
70        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
71    };
72
73    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
74        delete obj;
75    }
76
77    static SkPaint* init(JNIEnv* env, jobject clazz) {
78        SkPaint* obj = new SkPaint();
79        defaultSettingsForAndroid(obj);
80        return obj;
81    }
82
83    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
84        SkPaint* obj = new SkPaint(*paint);
85        return obj;
86    }
87
88    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
89        obj->reset();
90        defaultSettingsForAndroid(obj);
91    }
92
93    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
94        *dst = *src;
95    }
96
97    static jint getFlags(JNIEnv* env, jobject paint) {
98        NPE_CHECK_RETURN_ZERO(env, paint);
99        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
100    }
101
102    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
103        NPE_CHECK_RETURN_VOID(env, paint);
104        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
105    }
106
107    static jint getHinting(JNIEnv* env, jobject paint) {
108        NPE_CHECK_RETURN_ZERO(env, paint);
109        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
110                == SkPaint::kNo_Hinting ? 0 : 1;
111    }
112
113    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
114        NPE_CHECK_RETURN_VOID(env, paint);
115        GraphicsJNI::getNativePaint(env, paint)->setHinting(
116                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kNormal_Hinting);
117    }
118
119    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
120        NPE_CHECK_RETURN_VOID(env, paint);
121        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
122    }
123
124    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
125        NPE_CHECK_RETURN_VOID(env, paint);
126        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
127    }
128
129    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
130        NPE_CHECK_RETURN_VOID(env, paint);
131        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
132    }
133
134    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
135        NPE_CHECK_RETURN_VOID(env, paint);
136        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
137    }
138
139    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
140        NPE_CHECK_RETURN_VOID(env, paint);
141        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
142    }
143
144    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
145        NPE_CHECK_RETURN_VOID(env, paint);
146        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
147    }
148
149    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
150        NPE_CHECK_RETURN_VOID(env, paint);
151        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
152    }
153
154    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
155        NPE_CHECK_RETURN_VOID(env, paint);
156        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
157    }
158
159    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
160        return obj->getStyle();
161    }
162
163    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
164        obj->setStyle(style);
165    }
166
167    static jint getColor(JNIEnv* env, jobject paint) {
168        NPE_CHECK_RETURN_ZERO(env, paint);
169        return GraphicsJNI::getNativePaint(env, paint)->getColor();
170    }
171
172    static jint getAlpha(JNIEnv* env, jobject paint) {
173        NPE_CHECK_RETURN_ZERO(env, paint);
174        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
175    }
176
177    static void setColor(JNIEnv* env, jobject paint, jint color) {
178        NPE_CHECK_RETURN_VOID(env, paint);
179        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
180    }
181
182    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
183        NPE_CHECK_RETURN_VOID(env, paint);
184        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
185    }
186
187    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
188        NPE_CHECK_RETURN_ZERO(env, paint);
189        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
190    }
191
192    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
193        NPE_CHECK_RETURN_VOID(env, paint);
194        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
195    }
196
197    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
198        NPE_CHECK_RETURN_ZERO(env, paint);
199        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
200    }
201
202    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
203        NPE_CHECK_RETURN_VOID(env, paint);
204        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
205    }
206
207    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
208        return obj->getStrokeCap();
209    }
210
211    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
212        obj->setStrokeCap(cap);
213    }
214
215    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
216        return obj->getStrokeJoin();
217    }
218
219    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
220        obj->setStrokeJoin(join);
221    }
222
223    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
224        return obj->getFillPath(*src, dst);
225    }
226
227    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
228        return obj->setShader(shader);
229    }
230
231    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
232        return obj->setColorFilter(filter);
233    }
234
235    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
236        return obj->setXfermode(xfermode);
237    }
238
239    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
240        return obj->setPathEffect(effect);
241    }
242
243    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
244        return obj->setMaskFilter(maskfilter);
245    }
246
247    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
248        return obj->setTypeface(typeface);
249    }
250
251    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
252        return obj->setRasterizer(rasterizer);
253    }
254
255    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
256        return obj->getTextAlign();
257    }
258
259    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
260        obj->setTextAlign(align);
261    }
262
263    // generate bcp47 identifier for the supplied locale
264    static void toLanguageTag(char* output, size_t outSize,
265            const char* locale) {
266        if (output == NULL || outSize <= 0) {
267            return;
268        }
269        if (locale == NULL) {
270            output[0] = '\0';
271            return;
272        }
273        char canonicalChars[ULOC_FULLNAME_CAPACITY];
274        UErrorCode uErr = U_ZERO_ERROR;
275        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
276                &uErr);
277        if (U_SUCCESS(uErr)) {
278            char likelyChars[ULOC_FULLNAME_CAPACITY];
279            uErr = U_ZERO_ERROR;
280            uloc_addLikelySubtags(canonicalChars, likelyChars,
281                    ULOC_FULLNAME_CAPACITY, &uErr);
282            if (U_SUCCESS(uErr)) {
283                uErr = U_ZERO_ERROR;
284                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
285                if (U_SUCCESS(uErr)) {
286                    return;
287                } else {
288                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
289                            u_errorName(uErr));
290                }
291            } else {
292                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
293                        canonicalChars, u_errorName(uErr));
294            }
295        } else {
296            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
297                    u_errorName(uErr));
298        }
299        // unable to build a proper language identifier
300        output[0] = '\0';
301    }
302
303    static void setTextLocale(JNIEnv* env, jobject clazz, SkPaint* obj, jstring locale) {
304        ScopedUtfChars localeChars(env, locale);
305        char langTag[ULOC_FULLNAME_CAPACITY];
306        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
307
308        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
309        paintOpts.setLanguage(langTag);
310        obj->setPaintOptionsAndroid(paintOpts);
311    }
312
313    static jfloat getTextSize(JNIEnv* env, jobject paint) {
314        NPE_CHECK_RETURN_ZERO(env, paint);
315        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
316    }
317
318    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
319        NPE_CHECK_RETURN_VOID(env, paint);
320        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
321    }
322
323    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
324        NPE_CHECK_RETURN_ZERO(env, paint);
325        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
326    }
327
328    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
329        NPE_CHECK_RETURN_VOID(env, paint);
330        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
331    }
332
333    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
334        NPE_CHECK_RETURN_ZERO(env, paint);
335        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
336    }
337
338    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
339        NPE_CHECK_RETURN_VOID(env, paint);
340        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
341    }
342
343    static jfloat ascent(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.fAscent);
348    }
349
350    static jfloat descent(JNIEnv* env, jobject paint) {
351        NPE_CHECK_RETURN_ZERO(env, paint);
352        SkPaint::FontMetrics    metrics;
353        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
354        return SkScalarToFloat(metrics.fDescent);
355    }
356
357    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
358        NPE_CHECK_RETURN_ZERO(env, paint);
359        SkPaint::FontMetrics metrics;
360        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
361
362        if (metricsObj) {
363            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
364            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
365            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
366            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
367            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
368            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
369        }
370        return SkScalarToFloat(spacing);
371    }
372
373    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
374        NPE_CHECK_RETURN_ZERO(env, paint);
375        SkPaint::FontMetrics metrics;
376
377        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
378        int ascent = SkScalarRound(metrics.fAscent);
379        int descent = SkScalarRound(metrics.fDescent);
380        int leading = SkScalarRound(metrics.fLeading);
381
382        if (metricsObj) {
383            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
384            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
385            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
386            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
387            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
388            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
389        }
390        return descent - ascent + leading;
391    }
392
393    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count,
394            jint bidiFlags) {
395        NPE_CHECK_RETURN_ZERO(env, jpaint);
396        NPE_CHECK_RETURN_ZERO(env, text);
397
398        size_t textLength = env->GetArrayLength(text);
399        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
400            doThrowAIOOBE(env);
401            return 0;
402        }
403        if (count == 0) {
404            return 0;
405        }
406
407        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
408        const jchar* textArray = env->GetCharArrayElements(text, NULL);
409        jfloat result = 0;
410
411        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
412                bidiFlags, NULL /* dont need all advances */, &result);
413
414        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
415        return result;
416    }
417
418    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, int start, int end,
419            jint bidiFlags) {
420        NPE_CHECK_RETURN_ZERO(env, jpaint);
421        NPE_CHECK_RETURN_ZERO(env, text);
422
423        size_t textLength = env->GetStringLength(text);
424        int count = end - start;
425        if ((start | count) < 0 || (size_t)end > textLength) {
426            doThrowAIOOBE(env);
427            return 0;
428        }
429        if (count == 0) {
430            return 0;
431        }
432
433        const jchar* textArray = env->GetStringChars(text, NULL);
434        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
435        jfloat width = 0;
436
437        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
438                bidiFlags, NULL /* dont need all advances */, &width);
439
440        env->ReleaseStringChars(text, textArray);
441        return width;
442    }
443
444    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
445        NPE_CHECK_RETURN_ZERO(env, jpaint);
446        NPE_CHECK_RETURN_ZERO(env, text);
447
448        size_t textLength = env->GetStringLength(text);
449        if (textLength == 0) {
450            return 0;
451        }
452
453        const jchar* textArray = env->GetStringChars(text, NULL);
454        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
455        jfloat width = 0;
456
457        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
458                bidiFlags, NULL /* dont need all advances */, &width);
459
460        env->ReleaseStringChars(text, textArray);
461        return width;
462    }
463
464    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
465            jint bidiFlags) {
466        NPE_CHECK_RETURN_ZERO(env, paint);
467        NPE_CHECK_RETURN_ZERO(env, text);
468
469        if (count < 0 || !widths) {
470            doThrowAIOOBE(env);
471            return 0;
472        }
473        if (count == 0) {
474            return 0;
475        }
476        size_t widthsLength = env->GetArrayLength(widths);
477        if ((size_t)count > widthsLength) {
478            doThrowAIOOBE(env);
479            return 0;
480        }
481
482        AutoJavaFloatArray autoWidths(env, widths, count);
483        jfloat* widthsArray = autoWidths.ptr();
484
485        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
486                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
487
488        return count;
489    }
490
491    static int getTextWidths___CIII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
492            int index, int count, jint bidiFlags, jfloatArray widths) {
493        const jchar* textArray = env->GetCharArrayElements(text, NULL);
494        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
495        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
496                                      JNI_ABORT);
497        return count;
498    }
499
500    static int getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
501            int start, int end, jint bidiFlags, jfloatArray widths) {
502        const jchar* textArray = env->GetStringChars(text, NULL);
503        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
504        env->ReleaseStringChars(text, textArray);
505        return count;
506    }
507
508    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
509            jint contextCount, jint flags, jcharArray glyphs) {
510        NPE_CHECK_RETURN_ZERO(env, paint);
511        NPE_CHECK_RETURN_ZERO(env, text);
512
513        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
514            doThrowAIOOBE(env);
515            return 0;
516        }
517        if (count == 0) {
518            return 0;
519        }
520        size_t glypthsLength = env->GetArrayLength(glyphs);
521        if ((size_t)count > glypthsLength) {
522            doThrowAIOOBE(env);
523            return 0;
524        }
525
526        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
527
528        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
529                text, start, count, contextCount, flags);
530        const jchar* shapedGlyphs = value->getGlyphs();
531        size_t glyphsCount = value->getGlyphsCount();
532        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
533
534        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
535        return glyphsCount;
536    }
537
538    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
539            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
540            jcharArray glyphs) {
541        const jchar* textArray = env->GetStringChars(text, NULL);
542        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
543                end - start, contextEnd - contextStart, flags, glyphs);
544        env->ReleaseStringChars(text, textArray);
545        return count;
546    }
547
548    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
549                                    jint start, jint count, jint contextCount, jint flags,
550                                    jfloatArray advances, jint advancesIndex) {
551        NPE_CHECK_RETURN_ZERO(env, paint);
552        NPE_CHECK_RETURN_ZERO(env, text);
553
554        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
555            doThrowAIOOBE(env);
556            return 0;
557        }
558        if (count == 0) {
559            return 0;
560        }
561        if (advances) {
562            size_t advancesLength = env->GetArrayLength(advances);
563            if ((size_t)count > advancesLength) {
564                doThrowAIOOBE(env);
565                return 0;
566            }
567        }
568        jfloat advancesArray[count];
569        jfloat totalAdvance = 0;
570
571        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
572                                       advancesArray, &totalAdvance);
573
574        if (advances != NULL) {
575            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
576        }
577        return totalAdvance;
578    }
579
580    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
581            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
582            jint flags, jfloatArray advances, jint advancesIndex) {
583        jchar* textArray = env->GetCharArrayElements(text, NULL);
584        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
585                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
586        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
587        return result;
588    }
589
590    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
591            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
592            jfloatArray advances, jint advancesIndex) {
593        const jchar* textArray = env->GetStringChars(text, NULL);
594        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
595                start - contextStart, end - start, contextEnd - contextStart, flags,
596                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        jfloat scalarArray[count];
604
605        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
606                scalarArray, NULL /* dont need totalAdvance */);
607
608        jint pos = offset - start;
609        switch (opt) {
610        case AFTER:
611          if (pos < count) {
612            pos += 1;
613          }
614          // fall through
615        case AT_OR_AFTER:
616          while (pos < count && scalarArray[pos] == 0) {
617            ++pos;
618          }
619          break;
620        case BEFORE:
621          if (pos > 0) {
622            --pos;
623          }
624          // fall through
625        case AT_OR_BEFORE:
626          while (pos > 0 && scalarArray[pos] == 0) {
627            --pos;
628          }
629          break;
630        case AT:
631        default:
632          if (scalarArray[pos] == 0) {
633            pos = -1;
634          }
635          break;
636        }
637
638        if (pos != -1) {
639          pos += start;
640        }
641
642        return pos;
643    }
644
645    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
646            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
647        jchar* textArray = env->GetCharArrayElements(text, NULL);
648        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
649                offset, cursorOpt);
650        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
651        return result;
652    }
653
654    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
655            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
656        const jchar* textArray = env->GetStringChars(text, NULL);
657        jint result = doTextRunCursor(env, paint, textArray, contextStart,
658                contextEnd - contextStart, flags, offset, cursorOpt);
659        env->ReleaseStringChars(text, textArray);
660        return result;
661    }
662
663    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
664                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
665        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
666    }
667
668    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
669            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
670        const jchar* textArray = env->GetCharArrayElements(text, NULL);
671        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
672        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
673    }
674
675    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
676            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
677        const jchar* textArray = env->GetStringChars(text, NULL);
678        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
679        env->ReleaseStringChars(text, textArray);
680    }
681
682    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
683                               jfloat dx, jfloat dy, int color) {
684        NPE_CHECK_RETURN_VOID(env, jpaint);
685
686        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
687        if (radius <= 0) {
688            paint->setLooper(NULL);
689        }
690        else {
691            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
692                                                  SkFloatToScalar(dx),
693                                                  SkFloatToScalar(dy),
694                                                  (SkColor)color))->unref();
695        }
696    }
697
698    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
699                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
700                         SkPaint::TextBufferDirection tbd) {
701        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
702                text, 0, count, count, bidiFlags);
703        if (value == NULL) {
704            return 0;
705        }
706        SkScalar     measured;
707        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
708                                   SkFloatToScalar(maxWidth), &measured, tbd);
709        SkASSERT((bytes & 1) == 0);
710
711        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
712            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
713            jfloat* array = autoMeasured.ptr();
714            array[0] = SkScalarToFloat(measured);
715        }
716        return bytes >> 1;
717    }
718
719    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
720            int index, int count, float maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
721        NPE_CHECK_RETURN_ZERO(env, jpaint);
722        NPE_CHECK_RETURN_ZERO(env, jtext);
723
724        SkPaint::TextBufferDirection tbd;
725        if (count < 0) {
726            tbd = SkPaint::kBackward_TextBufferDirection;
727            count = -count;
728        }
729        else {
730            tbd = SkPaint::kForward_TextBufferDirection;
731        }
732
733        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
734            doThrowAIOOBE(env);
735            return 0;
736        }
737
738        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
739        const jchar* text = env->GetCharArrayElements(jtext, NULL);
740        count = breakText(env, *paint, text + index, count, maxWidth,
741                          bidiFlags, jmeasuredWidth, tbd);
742        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
743                                      JNI_ABORT);
744        return count;
745    }
746
747    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
748                bool forwards, float maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
749        NPE_CHECK_RETURN_ZERO(env, jpaint);
750        NPE_CHECK_RETURN_ZERO(env, jtext);
751
752        SkPaint::TextBufferDirection tbd = forwards ?
753                                        SkPaint::kForward_TextBufferDirection :
754                                        SkPaint::kBackward_TextBufferDirection;
755
756        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
757        int count = env->GetStringLength(jtext);
758        const jchar* text = env->GetStringChars(jtext, NULL);
759        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
760        env->ReleaseStringChars(jtext, text);
761        return count;
762    }
763
764    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
765                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
766        SkRect  r;
767        r.set(0,0,0,0);
768
769        SkIRect ir;
770
771        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
772                text, 0, count, count, bidiFlags);
773        if (value == NULL) {
774            return;
775        }
776        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
777        r.roundOut(&ir);
778        GraphicsJNI::irect_to_jrect(ir, env, bounds);
779    }
780
781    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
782                                jstring text, int start, int end, jint bidiFlags, jobject bounds) {
783        const jchar* textArray = env->GetStringChars(text, NULL);
784        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
785        env->ReleaseStringChars(text, textArray);
786    }
787
788    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
789                        jcharArray text, int index, int count, jint bidiFlags, jobject bounds) {
790        const jchar* textArray = env->GetCharArrayElements(text, NULL);
791        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
792        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
793                                      JNI_ABORT);
794    }
795
796};
797
798static JNINativeMethod methods[] = {
799    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
800    {"native_init","()I", (void*) SkPaintGlue::init},
801    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
802    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
803    {"native_set","(II)V", (void*) SkPaintGlue::assign},
804    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
805    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
806    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
807    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
808    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
809    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
810    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
811    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
812    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
813    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
814    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
815    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
816    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
817    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
818    {"getColor","()I", (void*) SkPaintGlue::getColor},
819    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
820    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
821    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
822    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
823    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
824    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
825    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
826    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
827    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
828    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
829    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
830    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
831    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
832    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
833    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
834    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
835    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
836    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
837    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
838    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
839    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
840    {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
841    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
842    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
843    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
844    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
845    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
846    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
847    {"ascent","()F", (void*) SkPaintGlue::ascent},
848    {"descent","()F", (void*) SkPaintGlue::descent},
849    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
850    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
851    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
852    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
853    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
854    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
855    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
856    {"native_getTextWidths","(I[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
857    {"native_getTextWidths","(ILjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
858    {"native_getTextRunAdvances","(I[CIIIII[FI)F",
859        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
860    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
861        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
862
863
864    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
865        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
866    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
867    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
868        (void*) SkPaintGlue::getTextRunCursor__String},
869    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
870    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
871    {"nativeGetStringBounds", "(ILjava/lang/String;IIILandroid/graphics/Rect;)V",
872                                        (void*) SkPaintGlue::getStringBounds },
873    {"nativeGetCharArrayBounds", "(I[CIIILandroid/graphics/Rect;)V",
874                                    (void*) SkPaintGlue::getCharArrayBounds },
875    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
876};
877
878static jfieldID req_fieldID(jfieldID id) {
879    SkASSERT(id);
880    return id;
881}
882
883int register_android_graphics_Paint(JNIEnv* env) {
884    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
885    SkASSERT(gFontMetrics_class);
886    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
887
888    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
889    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
890    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
891    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
892    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
893
894    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
895    SkASSERT(gFontMetricsInt_class);
896    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
897
898    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
899    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
900    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
901    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
902    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
903
904    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
905        sizeof(methods) / sizeof(methods[0]));
906    return result;
907}
908
909}
910