Paint.cpp revision a027ec5c2dbfbbf10cac9ea538f5e230b093be2f 
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 "core_jni_helpers.h"
25#include <ScopedStringChars.h>
26#include <ScopedUtfChars.h>
27
28#include "SkBlurDrawLooper.h"
29#include "SkColorFilter.h"
30#include "SkMaskFilter.h"
31#include "SkRasterizer.h"
32#include "SkShader.h"
33#include "SkTypeface.h"
34#include "SkXfermode.h"
35#include "unicode/uloc.h"
36#include "unicode/ushape.h"
37#include "utils/Blur.h"
38
39#include <minikin/GraphemeBreak.h>
40#include <minikin/Measurement.h>
41#include "MinikinSkia.h"
42#include "MinikinUtils.h"
43#include "Paint.h"
44#include "TypefaceImpl.h"
45
46#include <vector>
47
48// temporary for debugging
49#include <Caches.h>
50#include <utils/Log.h>
51
52namespace android {
53
54struct JMetricsID {
55    jfieldID    top;
56    jfieldID    ascent;
57    jfieldID    descent;
58    jfieldID    bottom;
59    jfieldID    leading;
60};
61
62static jclass   gFontMetrics_class;
63static JMetricsID gFontMetrics_fieldID;
64
65static jclass   gFontMetricsInt_class;
66static JMetricsID gFontMetricsInt_fieldID;
67
68static jclass   gPaint_class;
69static jfieldID gPaint_nativeInstanceID;
70static jfieldID gPaint_nativeTypefaceID;
71
72static void defaultSettingsForAndroid(Paint* paint) {
73    // GlyphID encoding is required because we are using Harfbuzz shaping
74    paint->setTextEncoding(Paint::kGlyphID_TextEncoding);
75}
76
77class PaintGlue {
78public:
79    enum MoveOpt {
80        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
81    };
82
83    static Paint* getNativePaint(JNIEnv* env, jobject paint) {
84        SkASSERT(env);
85        SkASSERT(paint);
86        SkASSERT(env->IsInstanceOf(paint, gPaint_class));
87        jlong paintHandle = env->GetLongField(paint, gPaint_nativeInstanceID);
88        android::Paint* p = reinterpret_cast<android::Paint*>(paintHandle);
89        SkASSERT(p);
90        return p;
91    }
92
93    static TypefaceImpl* getNativeTypeface(JNIEnv* env, jobject paint) {
94        SkASSERT(env);
95        SkASSERT(paint);
96        SkASSERT(env->IsInstanceOf(paint, gPaint_class));
97        jlong typefaceHandle = env->GetLongField(paint, gPaint_nativeTypefaceID);
98        android::TypefaceImpl* p = reinterpret_cast<android::TypefaceImpl*>(typefaceHandle);
99        return p;
100    }
101
102    static void finalizer(JNIEnv* env, jobject clazz, jlong objHandle) {
103        Paint* obj = reinterpret_cast<Paint*>(objHandle);
104        delete obj;
105    }
106
107    static jlong init(JNIEnv* env, jobject clazz) {
108        SK_COMPILE_ASSERT(1 <<  0 == SkPaint::kAntiAlias_Flag,          paint_flags_mismatch);
109        SK_COMPILE_ASSERT(1 <<  2 == SkPaint::kDither_Flag,             paint_flags_mismatch);
110        SK_COMPILE_ASSERT(1 <<  3 == SkPaint::kUnderlineText_Flag,      paint_flags_mismatch);
111        SK_COMPILE_ASSERT(1 <<  4 == SkPaint::kStrikeThruText_Flag,     paint_flags_mismatch);
112        SK_COMPILE_ASSERT(1 <<  5 == SkPaint::kFakeBoldText_Flag,       paint_flags_mismatch);
113        SK_COMPILE_ASSERT(1 <<  6 == SkPaint::kLinearText_Flag,         paint_flags_mismatch);
114        SK_COMPILE_ASSERT(1 <<  7 == SkPaint::kSubpixelText_Flag,       paint_flags_mismatch);
115        SK_COMPILE_ASSERT(1 <<  8 == SkPaint::kDevKernText_Flag,        paint_flags_mismatch);
116        SK_COMPILE_ASSERT(1 << 10 == SkPaint::kEmbeddedBitmapText_Flag, paint_flags_mismatch);
117
118        Paint* obj = new Paint();
119        defaultSettingsForAndroid(obj);
120        return reinterpret_cast<jlong>(obj);
121    }
122
123    static jlong initWithPaint(JNIEnv* env, jobject clazz, jlong paintHandle) {
124        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
125        Paint* obj = new Paint(*paint);
126        return reinterpret_cast<jlong>(obj);
127    }
128
129    static void reset(JNIEnv* env, jobject clazz, jlong objHandle) {
130        Paint* obj = reinterpret_cast<Paint*>(objHandle);
131        obj->reset();
132        defaultSettingsForAndroid(obj);
133    }
134
135    static void assign(JNIEnv* env, jobject clazz, jlong dstPaintHandle, jlong srcPaintHandle) {
136        Paint* dst = reinterpret_cast<Paint*>(dstPaintHandle);
137        const Paint* src = reinterpret_cast<Paint*>(srcPaintHandle);
138        *dst = *src;
139    }
140
141    // Equivalent to the Java Paint's FILTER_BITMAP_FLAG.
142    static const uint32_t sFilterBitmapFlag = 0x02;
143
144    static jint getFlags(JNIEnv* env, jobject paint) {
145        NPE_CHECK_RETURN_ZERO(env, paint);
146        Paint* nativePaint = getNativePaint(env, paint);
147        uint32_t result = nativePaint->getFlags();
148        result &= ~sFilterBitmapFlag; // Filtering no longer stored in this bit. Mask away.
149        if (nativePaint->getFilterQuality() != kNone_SkFilterQuality) {
150            result |= sFilterBitmapFlag;
151        }
152        return static_cast<jint>(result);
153    }
154
155    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
156        NPE_CHECK_RETURN_VOID(env, paint);
157        Paint* nativePaint = getNativePaint(env, paint);
158        // Instead of modifying 0x02, change the filter level.
159        nativePaint->setFilterQuality(flags & sFilterBitmapFlag
160                ? kLow_SkFilterQuality
161                : kNone_SkFilterQuality);
162        // Don't pass through filter flag, which is no longer stored in paint's flags.
163        flags &= ~sFilterBitmapFlag;
164        // Use the existing value for 0x02.
165        const uint32_t existing0x02Flag = nativePaint->getFlags() & sFilterBitmapFlag;
166        flags |= existing0x02Flag;
167        nativePaint->setFlags(flags);
168    }
169
170    static jint getHinting(JNIEnv* env, jobject paint) {
171        NPE_CHECK_RETURN_ZERO(env, paint);
172        return getNativePaint(env, paint)->getHinting()
173                == Paint::kNo_Hinting ? 0 : 1;
174    }
175
176    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
177        NPE_CHECK_RETURN_VOID(env, paint);
178        getNativePaint(env, paint)->setHinting(
179                mode == 0 ? Paint::kNo_Hinting : Paint::kNormal_Hinting);
180    }
181
182    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
183        NPE_CHECK_RETURN_VOID(env, paint);
184        getNativePaint(env, paint)->setAntiAlias(aa);
185    }
186
187    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
188        NPE_CHECK_RETURN_VOID(env, paint);
189        getNativePaint(env, paint)->setLinearText(linearText);
190    }
191
192    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
193        NPE_CHECK_RETURN_VOID(env, paint);
194        getNativePaint(env, paint)->setSubpixelText(subpixelText);
195    }
196
197    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
198        NPE_CHECK_RETURN_VOID(env, paint);
199        getNativePaint(env, paint)->setUnderlineText(underlineText);
200    }
201
202    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
203        NPE_CHECK_RETURN_VOID(env, paint);
204        getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
205    }
206
207    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
208        NPE_CHECK_RETURN_VOID(env, paint);
209        getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
210    }
211
212    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
213        NPE_CHECK_RETURN_VOID(env, paint);
214        getNativePaint(env, paint)->setFilterQuality(
215                filterBitmap ? kLow_SkFilterQuality : kNone_SkFilterQuality);
216    }
217
218    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
219        NPE_CHECK_RETURN_VOID(env, paint);
220        getNativePaint(env, paint)->setDither(dither);
221    }
222
223    static jint getStyle(JNIEnv* env, jobject clazz,jlong objHandle) {
224        Paint* obj = reinterpret_cast<Paint*>(objHandle);
225        return static_cast<jint>(obj->getStyle());
226    }
227
228    static void setStyle(JNIEnv* env, jobject clazz, jlong objHandle, jint styleHandle) {
229        Paint* obj = reinterpret_cast<Paint*>(objHandle);
230        Paint::Style style = static_cast<Paint::Style>(styleHandle);
231        obj->setStyle(style);
232    }
233
234    static jint getColor(JNIEnv* env, jobject paint) {
235        NPE_CHECK_RETURN_ZERO(env, paint);
236        int color;
237        color = getNativePaint(env, paint)->getColor();
238        return static_cast<jint>(color);
239    }
240
241    static jint getAlpha(JNIEnv* env, jobject paint) {
242        NPE_CHECK_RETURN_ZERO(env, paint);
243        int alpha;
244        alpha = getNativePaint(env, paint)->getAlpha();
245        return static_cast<jint>(alpha);
246    }
247
248    static void setColor(JNIEnv* env, jobject paint, jint color) {
249        NPE_CHECK_RETURN_VOID(env, paint);
250        getNativePaint(env, paint)->setColor(color);
251    }
252
253    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
254        NPE_CHECK_RETURN_VOID(env, paint);
255        getNativePaint(env, paint)->setAlpha(a);
256    }
257
258    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
259        NPE_CHECK_RETURN_ZERO(env, paint);
260        return SkScalarToFloat(getNativePaint(env, paint)->getStrokeWidth());
261    }
262
263    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
264        NPE_CHECK_RETURN_VOID(env, paint);
265        getNativePaint(env, paint)->setStrokeWidth(width);
266    }
267
268    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
269        NPE_CHECK_RETURN_ZERO(env, paint);
270        return SkScalarToFloat(getNativePaint(env, paint)->getStrokeMiter());
271    }
272
273    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
274        NPE_CHECK_RETURN_VOID(env, paint);
275        getNativePaint(env, paint)->setStrokeMiter(miter);
276    }
277
278    static jint getStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle) {
279        Paint* obj = reinterpret_cast<Paint*>(objHandle);
280        return static_cast<jint>(obj->getStrokeCap());
281    }
282
283    static void setStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle, jint capHandle) {
284        Paint* obj = reinterpret_cast<Paint*>(objHandle);
285        Paint::Cap cap = static_cast<Paint::Cap>(capHandle);
286        obj->setStrokeCap(cap);
287    }
288
289    static jint getStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle) {
290        Paint* obj = reinterpret_cast<Paint*>(objHandle);
291        return static_cast<jint>(obj->getStrokeJoin());
292    }
293
294    static void setStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle, jint joinHandle) {
295        Paint* obj = reinterpret_cast<Paint*>(objHandle);
296        Paint::Join join = (Paint::Join) joinHandle;
297        obj->setStrokeJoin(join);
298    }
299
300    static jboolean getFillPath(JNIEnv* env, jobject clazz, jlong objHandle, jlong srcHandle, jlong dstHandle) {
301        Paint* obj = reinterpret_cast<Paint*>(objHandle);
302        SkPath* src = reinterpret_cast<SkPath*>(srcHandle);
303        SkPath* dst = reinterpret_cast<SkPath*>(dstHandle);
304        return obj->getFillPath(*src, dst) ? JNI_TRUE : JNI_FALSE;
305    }
306
307    static jlong setShader(JNIEnv* env, jobject clazz, jlong objHandle, jlong shaderHandle) {
308        Paint* obj = reinterpret_cast<Paint*>(objHandle);
309        SkShader* shader = reinterpret_cast<SkShader*>(shaderHandle);
310        return reinterpret_cast<jlong>(obj->setShader(shader));
311    }
312
313    static jlong setColorFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong filterHandle) {
314        Paint* obj = reinterpret_cast<Paint *>(objHandle);
315        SkColorFilter* filter  = reinterpret_cast<SkColorFilter *>(filterHandle);
316        return reinterpret_cast<jlong>(obj->setColorFilter(filter));
317    }
318
319    static jlong setXfermode(JNIEnv* env, jobject clazz, jlong objHandle, jlong xfermodeHandle) {
320        Paint* obj = reinterpret_cast<Paint*>(objHandle);
321        SkXfermode* xfermode = reinterpret_cast<SkXfermode*>(xfermodeHandle);
322        return reinterpret_cast<jlong>(obj->setXfermode(xfermode));
323    }
324
325    static jlong setPathEffect(JNIEnv* env, jobject clazz, jlong objHandle, jlong effectHandle) {
326        Paint* obj = reinterpret_cast<Paint*>(objHandle);
327        SkPathEffect* effect  = reinterpret_cast<SkPathEffect*>(effectHandle);
328        return reinterpret_cast<jlong>(obj->setPathEffect(effect));
329    }
330
331    static jlong setMaskFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong maskfilterHandle) {
332        Paint* obj = reinterpret_cast<Paint*>(objHandle);
333        SkMaskFilter* maskfilter  = reinterpret_cast<SkMaskFilter*>(maskfilterHandle);
334        return reinterpret_cast<jlong>(obj->setMaskFilter(maskfilter));
335    }
336
337    static jlong setTypeface(JNIEnv* env, jobject clazz, jlong objHandle, jlong typefaceHandle) {
338        // TODO: in Paint refactoring, set typeface on android Paint, not Paint
339        return NULL;
340    }
341
342    static jlong setRasterizer(JNIEnv* env, jobject clazz, jlong objHandle, jlong rasterizerHandle) {
343        Paint* obj = reinterpret_cast<Paint*>(objHandle);
344        SkAutoTUnref<SkRasterizer> rasterizer(GraphicsJNI::refNativeRasterizer(rasterizerHandle));
345        return reinterpret_cast<jlong>(obj->setRasterizer(rasterizer));
346    }
347
348    static jint getTextAlign(JNIEnv* env, jobject clazz, jlong objHandle) {
349        Paint* obj = reinterpret_cast<Paint*>(objHandle);
350        return static_cast<jint>(obj->getTextAlign());
351    }
352
353    static void setTextAlign(JNIEnv* env, jobject clazz, jlong objHandle, jint alignHandle) {
354        Paint* obj = reinterpret_cast<Paint*>(objHandle);
355        Paint::Align align = static_cast<Paint::Align>(alignHandle);
356        obj->setTextAlign(align);
357    }
358
359    // generate bcp47 identifier for the supplied locale
360    static void toLanguageTag(char* output, size_t outSize,
361            const char* locale) {
362        if (output == NULL || outSize <= 0) {
363            return;
364        }
365        if (locale == NULL) {
366            output[0] = '\0';
367            return;
368        }
369        char canonicalChars[ULOC_FULLNAME_CAPACITY];
370        UErrorCode uErr = U_ZERO_ERROR;
371        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
372                &uErr);
373        if (U_SUCCESS(uErr)) {
374            char likelyChars[ULOC_FULLNAME_CAPACITY];
375            uErr = U_ZERO_ERROR;
376            uloc_addLikelySubtags(canonicalChars, likelyChars,
377                    ULOC_FULLNAME_CAPACITY, &uErr);
378            if (U_SUCCESS(uErr)) {
379                uErr = U_ZERO_ERROR;
380                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
381                if (U_SUCCESS(uErr)) {
382                    return;
383                } else {
384                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
385                            u_errorName(uErr));
386                }
387            } else {
388                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
389                        canonicalChars, u_errorName(uErr));
390            }
391        } else {
392            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
393                    u_errorName(uErr));
394        }
395        // unable to build a proper language identifier
396        output[0] = '\0';
397    }
398
399    static void setTextLocale(JNIEnv* env, jobject clazz, jlong objHandle, jstring locale) {
400        Paint* obj = reinterpret_cast<Paint*>(objHandle);
401        ScopedUtfChars localeChars(env, locale);
402        char langTag[ULOC_FULLNAME_CAPACITY];
403        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
404
405        obj->setTextLocale(langTag);
406    }
407
408    static jboolean isElegantTextHeight(JNIEnv* env, jobject paint) {
409        NPE_CHECK_RETURN_ZERO(env, paint);
410        Paint* obj = getNativePaint(env, paint);
411        return obj->getFontVariant() == VARIANT_ELEGANT;
412    }
413
414    static void setElegantTextHeight(JNIEnv* env, jobject paint, jboolean aa) {
415        NPE_CHECK_RETURN_VOID(env, paint);
416        Paint* obj = getNativePaint(env, paint);
417        obj->setFontVariant(aa ? VARIANT_ELEGANT : VARIANT_DEFAULT);
418    }
419
420    static jfloat getTextSize(JNIEnv* env, jobject paint) {
421        NPE_CHECK_RETURN_ZERO(env, paint);
422        return SkScalarToFloat(getNativePaint(env, paint)->getTextSize());
423    }
424
425    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
426        NPE_CHECK_RETURN_VOID(env, paint);
427        getNativePaint(env, paint)->setTextSize(textSize);
428    }
429
430    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
431        NPE_CHECK_RETURN_ZERO(env, paint);
432        return SkScalarToFloat(getNativePaint(env, paint)->getTextScaleX());
433    }
434
435    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
436        NPE_CHECK_RETURN_VOID(env, paint);
437        getNativePaint(env, paint)->setTextScaleX(scaleX);
438    }
439
440    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
441        NPE_CHECK_RETURN_ZERO(env, paint);
442        return SkScalarToFloat(getNativePaint(env, paint)->getTextSkewX());
443    }
444
445    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
446        NPE_CHECK_RETURN_VOID(env, paint);
447        getNativePaint(env, paint)->setTextSkewX(skewX);
448    }
449
450    static jfloat getLetterSpacing(JNIEnv* env, jobject clazz, jlong paintHandle) {
451        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
452        return paint->getLetterSpacing();
453    }
454
455    static void setLetterSpacing(JNIEnv* env, jobject clazz, jlong paintHandle, jfloat letterSpacing) {
456        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
457        paint->setLetterSpacing(letterSpacing);
458    }
459
460    static void setFontFeatureSettings(JNIEnv* env, jobject clazz, jlong paintHandle, jstring settings) {
461        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
462        if (!settings) {
463            paint->setFontFeatureSettings(std::string());
464        } else {
465            ScopedUtfChars settingsChars(env, settings);
466            paint->setFontFeatureSettings(std::string(settingsChars.c_str(), settingsChars.size()));
467        }
468    }
469
470    static jint getHyphenEdit(JNIEnv* env, jobject clazz, jlong paintHandle, jint hyphen) {
471        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
472        return paint->getHyphenEdit();
473    }
474
475    static void setHyphenEdit(JNIEnv* env, jobject clazz, jlong paintHandle, jint hyphen) {
476        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
477        paint->setHyphenEdit((uint32_t)hyphen);
478    }
479
480    static SkScalar getMetricsInternal(JNIEnv* env, jobject jpaint, Paint::FontMetrics *metrics) {
481        const int kElegantTop = 2500;
482        const int kElegantBottom = -1000;
483        const int kElegantAscent = 1900;
484        const int kElegantDescent = -500;
485        const int kElegantLeading = 0;
486        Paint* paint = getNativePaint(env, jpaint);
487        TypefaceImpl* typeface = getNativeTypeface(env, jpaint);
488        typeface = TypefaceImpl_resolveDefault(typeface);
489        FakedFont baseFont = typeface->fFontCollection->baseFontFaked(typeface->fStyle);
490        float saveSkewX = paint->getTextSkewX();
491        bool savefakeBold = paint->isFakeBoldText();
492        MinikinFontSkia::populateSkPaint(paint, baseFont.font, baseFont.fakery);
493        SkScalar spacing = paint->getFontMetrics(metrics);
494        // The populateSkPaint call may have changed fake bold / text skew
495        // because we want to measure with those effects applied, so now
496        // restore the original settings.
497        paint->setTextSkewX(saveSkewX);
498        paint->setFakeBoldText(savefakeBold);
499        if (paint->getFontVariant() == VARIANT_ELEGANT) {
500            SkScalar size = paint->getTextSize();
501            metrics->fTop = -size * kElegantTop / 2048;
502            metrics->fBottom = -size * kElegantBottom / 2048;
503            metrics->fAscent = -size * kElegantAscent / 2048;
504            metrics->fDescent = -size * kElegantDescent / 2048;
505            metrics->fLeading = size * kElegantLeading / 2048;
506            spacing = metrics->fDescent - metrics->fAscent + metrics->fLeading;
507        }
508        return spacing;
509    }
510
511    static jfloat ascent(JNIEnv* env, jobject paint) {
512        NPE_CHECK_RETURN_ZERO(env, paint);
513        Paint::FontMetrics metrics;
514        getMetricsInternal(env, paint, &metrics);
515        return SkScalarToFloat(metrics.fAscent);
516    }
517
518    static jfloat descent(JNIEnv* env, jobject paint) {
519        NPE_CHECK_RETURN_ZERO(env, paint);
520        Paint::FontMetrics metrics;
521        getMetricsInternal(env, paint, &metrics);
522        return SkScalarToFloat(metrics.fDescent);
523    }
524
525    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
526        NPE_CHECK_RETURN_ZERO(env, paint);
527        Paint::FontMetrics metrics;
528        SkScalar spacing = getMetricsInternal(env, paint, &metrics);
529
530        if (metricsObj) {
531            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
532            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
533            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
534            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
535            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
536            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
537        }
538        return SkScalarToFloat(spacing);
539    }
540
541    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
542        NPE_CHECK_RETURN_ZERO(env, paint);
543        Paint::FontMetrics metrics;
544
545        getMetricsInternal(env, paint, &metrics);
546        int ascent = SkScalarRoundToInt(metrics.fAscent);
547        int descent = SkScalarRoundToInt(metrics.fDescent);
548        int leading = SkScalarRoundToInt(metrics.fLeading);
549
550        if (metricsObj) {
551            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
552            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloorToInt(metrics.fTop));
553            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
554            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
555            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeilToInt(metrics.fBottom));
556            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
557        }
558        return descent - ascent + leading;
559    }
560
561    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, jint index, jint count,
562            jint bidiFlags) {
563        NPE_CHECK_RETURN_ZERO(env, jpaint);
564        NPE_CHECK_RETURN_ZERO(env, text);
565
566        size_t textLength = env->GetArrayLength(text);
567        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
568            doThrowAIOOBE(env);
569            return 0;
570        }
571        if (count == 0) {
572            return 0;
573        }
574
575        Paint* paint = getNativePaint(env, jpaint);
576        const jchar* textArray = env->GetCharArrayElements(text, NULL);
577        jfloat result = 0;
578
579        Layout layout;
580        TypefaceImpl* typeface = getNativeTypeface(env, jpaint);
581        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, textArray, index, count, textLength);
582        result = layout.getAdvance();
583        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
584        return result;
585    }
586
587    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, jint start, jint end,
588            jint bidiFlags) {
589        NPE_CHECK_RETURN_ZERO(env, jpaint);
590        NPE_CHECK_RETURN_ZERO(env, text);
591
592        size_t textLength = env->GetStringLength(text);
593        int count = end - start;
594        if ((start | count) < 0 || (size_t)end > textLength) {
595            doThrowAIOOBE(env);
596            return 0;
597        }
598        if (count == 0) {
599            return 0;
600        }
601
602        const jchar* textArray = env->GetStringChars(text, NULL);
603        Paint* paint = getNativePaint(env, jpaint);
604        jfloat width = 0;
605
606        Layout layout;
607        TypefaceImpl* typeface = getNativeTypeface(env, jpaint);
608        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, textArray, start, count, textLength);
609        width = layout.getAdvance();
610
611        env->ReleaseStringChars(text, textArray);
612        return width;
613    }
614
615    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
616        NPE_CHECK_RETURN_ZERO(env, jpaint);
617        NPE_CHECK_RETURN_ZERO(env, text);
618
619        size_t textLength = env->GetStringLength(text);
620        if (textLength == 0) {
621            return 0;
622        }
623
624        const jchar* textArray = env->GetStringChars(text, NULL);
625        Paint* paint = getNativePaint(env, jpaint);
626        jfloat width = 0;
627
628        Layout layout;
629        TypefaceImpl* typeface = getNativeTypeface(env, jpaint);
630        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, textArray, 0, textLength, textLength);
631        width = layout.getAdvance();
632
633        env->ReleaseStringChars(text, textArray);
634        return width;
635    }
636
637    static int dotextwidths(JNIEnv* env, Paint* paint, TypefaceImpl* typeface, const jchar text[], int count,
638            jfloatArray widths, jint bidiFlags) {
639        NPE_CHECK_RETURN_ZERO(env, paint);
640        NPE_CHECK_RETURN_ZERO(env, text);
641
642        if (count < 0 || !widths) {
643            doThrowAIOOBE(env);
644            return 0;
645        }
646        if (count == 0) {
647            return 0;
648        }
649        size_t widthsLength = env->GetArrayLength(widths);
650        if ((size_t)count > widthsLength) {
651            doThrowAIOOBE(env);
652            return 0;
653        }
654
655        AutoJavaFloatArray autoWidths(env, widths, count);
656        jfloat* widthsArray = autoWidths.ptr();
657
658        Layout layout;
659        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, text, 0, count, count);
660        layout.getAdvances(widthsArray);
661
662        return count;
663    }
664
665    static jint getTextWidths___CIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jlong typefaceHandle, jcharArray text,
666            jint index, jint count, jint bidiFlags, jfloatArray widths) {
667        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
668        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
669        const jchar* textArray = env->GetCharArrayElements(text, NULL);
670        count = dotextwidths(env, paint, typeface, textArray + index, count, widths, bidiFlags);
671        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
672                                      JNI_ABORT);
673        return count;
674    }
675
676    static jint getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jlong typefaceHandle, jstring text,
677            jint start, jint end, jint bidiFlags, jfloatArray widths) {
678        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
679        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
680        const jchar* textArray = env->GetStringChars(text, NULL);
681        int count = dotextwidths(env, paint, typeface, textArray + start, end - start, widths, bidiFlags);
682        env->ReleaseStringChars(text, textArray);
683        return count;
684    }
685
686    static jfloat doTextRunAdvances(JNIEnv *env, Paint *paint, TypefaceImpl* typeface, const jchar *text,
687                                    jint start, jint count, jint contextCount, jboolean isRtl,
688                                    jfloatArray advances, jint advancesIndex) {
689        NPE_CHECK_RETURN_ZERO(env, paint);
690        NPE_CHECK_RETURN_ZERO(env, text);
691
692        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
693            doThrowAIOOBE(env);
694            return 0;
695        }
696        if (count == 0) {
697            return 0;
698        }
699        if (advances) {
700            size_t advancesLength = env->GetArrayLength(advances);
701            if ((size_t)count > advancesLength) {
702                doThrowAIOOBE(env);
703                return 0;
704            }
705        }
706        jfloat* advancesArray = new jfloat[count];
707        jfloat totalAdvance = 0;
708
709        int bidiFlags = isRtl ? kBidi_Force_RTL : kBidi_Force_LTR;
710
711        Layout layout;
712        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, text, start, count, contextCount);
713        layout.getAdvances(advancesArray);
714        totalAdvance = layout.getAdvance();
715
716        if (advances != NULL) {
717            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
718        }
719        delete [] advancesArray;
720        return totalAdvance;
721    }
722
723    static jfloat getTextRunAdvances___CIIIIZ_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
724            jlong typefaceHandle,
725            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
726            jboolean isRtl, jfloatArray advances, jint advancesIndex) {
727        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
728        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
729        jchar* textArray = env->GetCharArrayElements(text, NULL);
730        jfloat result = doTextRunAdvances(env, paint, typeface, textArray + contextIndex,
731                index - contextIndex, count, contextCount, isRtl, advances, advancesIndex);
732        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
733        return result;
734    }
735
736    static jfloat getTextRunAdvances__StringIIIIZ_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
737            jlong typefaceHandle,
738            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jboolean isRtl,
739            jfloatArray advances, jint advancesIndex) {
740        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
741        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
742        const jchar* textArray = env->GetStringChars(text, NULL);
743        jfloat result = doTextRunAdvances(env, paint, typeface, textArray + contextStart,
744                start - contextStart, end - start, contextEnd - contextStart, isRtl,
745                advances, advancesIndex);
746        env->ReleaseStringChars(text, textArray);
747        return result;
748    }
749
750    static jint doTextRunCursor(JNIEnv *env, Paint* paint, const jchar *text, jint start,
751            jint count, jint flags, jint offset, jint opt) {
752        GraphemeBreak::MoveOpt moveOpt = GraphemeBreak::MoveOpt(opt);
753        size_t result = GraphemeBreak::getTextRunCursor(text, start, count, offset, moveOpt);
754        return static_cast<jint>(result);
755    }
756
757    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
758            jint contextStart, jint contextCount, jint dir, jint offset, jint cursorOpt) {
759        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
760        jchar* textArray = env->GetCharArrayElements(text, NULL);
761        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, dir,
762                offset, cursorOpt);
763        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
764        return result;
765    }
766
767    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
768            jint contextStart, jint contextEnd, jint dir, jint offset, jint cursorOpt) {
769        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
770        const jchar* textArray = env->GetStringChars(text, NULL);
771        jint result = doTextRunCursor(env, paint, textArray, contextStart,
772                contextEnd - contextStart, dir, offset, cursorOpt);
773        env->ReleaseStringChars(text, textArray);
774        return result;
775    }
776
777    class GetTextFunctor {
778    public:
779        GetTextFunctor(const Layout& layout, SkPath* path, jfloat x, jfloat y, Paint* paint,
780                    uint16_t* glyphs, SkPoint* pos)
781                : layout(layout), path(path), x(x), y(y), paint(paint), glyphs(glyphs), pos(pos) {
782        }
783
784        void operator()(size_t start, size_t end) {
785            for (size_t i = start; i < end; i++) {
786                glyphs[i] = layout.getGlyphId(i);
787                pos[i].fX = x + layout.getX(i);
788                pos[i].fY = y + layout.getY(i);
789            }
790            if (start == 0) {
791                paint->getPosTextPath(glyphs + start, (end - start) << 1, pos + start, path);
792            } else {
793                paint->getPosTextPath(glyphs + start, (end - start) << 1, pos + start, &tmpPath);
794                path->addPath(tmpPath);
795            }
796        }
797    private:
798        const Layout& layout;
799        SkPath* path;
800        jfloat x;
801        jfloat y;
802        Paint* paint;
803        uint16_t* glyphs;
804        SkPoint* pos;
805        SkPath tmpPath;
806    };
807
808    static void getTextPath(JNIEnv* env, Paint* paint, TypefaceImpl* typeface, const jchar* text,
809            jint count, jint bidiFlags, jfloat x, jfloat y, SkPath* path) {
810        Layout layout;
811        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, text, 0, count, count);
812        size_t nGlyphs = layout.nGlyphs();
813        uint16_t* glyphs = new uint16_t[nGlyphs];
814        SkPoint* pos = new SkPoint[nGlyphs];
815
816        x += MinikinUtils::xOffsetForTextAlign(paint, layout);
817        Paint::Align align = paint->getTextAlign();
818        paint->setTextAlign(Paint::kLeft_Align);
819        paint->setTextEncoding(Paint::kGlyphID_TextEncoding);
820        GetTextFunctor f(layout, path, x, y, paint, glyphs, pos);
821        MinikinUtils::forFontRun(layout, paint, f);
822        paint->setTextAlign(align);
823        delete[] glyphs;
824        delete[] pos;
825    }
826
827    static void getTextPath___C(JNIEnv* env, jobject clazz, jlong paintHandle,
828            jlong typefaceHandle, jint bidiFlags,
829            jcharArray text, jint index, jint count, jfloat x, jfloat y, jlong pathHandle) {
830        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
831        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
832        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
833        const jchar* textArray = env->GetCharArrayElements(text, NULL);
834        getTextPath(env, paint, typeface, textArray + index, count, bidiFlags, x, y, path);
835        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
836    }
837
838    static void getTextPath__String(JNIEnv* env, jobject clazz, jlong paintHandle,
839            jlong typefaceHandle, jint bidiFlags,
840            jstring text, jint start, jint end, jfloat x, jfloat y, jlong pathHandle) {
841        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
842        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
843        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
844        const jchar* textArray = env->GetStringChars(text, NULL);
845        getTextPath(env, paint, typeface, textArray + start, end - start, bidiFlags, x, y, path);
846        env->ReleaseStringChars(text, textArray);
847    }
848
849    static void setShadowLayer(JNIEnv* env, jobject clazz, jlong paintHandle, jfloat radius,
850                               jfloat dx, jfloat dy, jint color) {
851        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
852        if (radius <= 0) {
853            paint->setLooper(NULL);
854        }
855        else {
856            SkScalar sigma = android::uirenderer::Blur::convertRadiusToSigma(radius);
857            paint->setLooper(SkBlurDrawLooper::Create((SkColor)color, sigma, dx, dy))->unref();
858        }
859    }
860
861    static jboolean hasShadowLayer(JNIEnv* env, jobject clazz, jlong paintHandle) {
862        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
863        return paint->getLooper() && paint->getLooper()->asABlurShadow(NULL);
864    }
865
866    static int breakText(JNIEnv* env, const Paint& paint, TypefaceImpl* typeface, const jchar text[],
867                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
868                         const bool forwardScan) {
869        size_t measuredCount = 0;
870        float measured = 0;
871
872        Layout layout;
873        MinikinUtils::doLayout(&layout, &paint, bidiFlags, typeface, text, 0, count, count);
874        float* advances = new float[count];
875        layout.getAdvances(advances);
876
877        for (int i = 0; i < count; i++) {
878            // traverse in the given direction
879            int index = forwardScan ? i : (count - i - 1);
880            float width = advances[index];
881            if (measured + width > maxWidth) {
882                break;
883            }
884            // properly handle clusters when scanning backwards
885            if (forwardScan || width != 0.0f) {
886                measuredCount = i + 1;
887            }
888            measured += width;
889        }
890        delete[] advances;
891
892        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
893            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
894            jfloat* array = autoMeasured.ptr();
895            array[0] = measured;
896        }
897        return measuredCount;
898    }
899
900    static jint breakTextC(JNIEnv* env, jobject clazz, jlong paintHandle, jlong typefaceHandle, jcharArray jtext,
901            jint index, jint count, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
902        NPE_CHECK_RETURN_ZERO(env, jtext);
903
904        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
905        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
906
907        bool forwardTextDirection;
908        if (count < 0) {
909            forwardTextDirection = false;
910            count = -count;
911        }
912        else {
913            forwardTextDirection = true;
914        }
915
916        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
917            doThrowAIOOBE(env);
918            return 0;
919        }
920
921        const jchar* text = env->GetCharArrayElements(jtext, NULL);
922        count = breakText(env, *paint, typeface, text + index, count, maxWidth,
923                          bidiFlags, jmeasuredWidth, forwardTextDirection);
924        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
925                                      JNI_ABORT);
926        return count;
927    }
928
929    static jint breakTextS(JNIEnv* env, jobject clazz, jlong paintHandle, jlong typefaceHandle, jstring jtext,
930                jboolean forwards, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
931        NPE_CHECK_RETURN_ZERO(env, jtext);
932
933        Paint* paint = reinterpret_cast<Paint*>(paintHandle);
934        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
935
936        int count = env->GetStringLength(jtext);
937        const jchar* text = env->GetStringChars(jtext, NULL);
938        count = breakText(env, *paint, typeface, text, count, maxWidth, bidiFlags, jmeasuredWidth, forwards);
939        env->ReleaseStringChars(jtext, text);
940        return count;
941    }
942
943    static void doTextBounds(JNIEnv* env, const jchar* text, int count, jobject bounds,
944            const Paint& paint, TypefaceImpl* typeface, jint bidiFlags) {
945        SkRect  r;
946        SkIRect ir;
947
948        Layout layout;
949        MinikinUtils::doLayout(&layout, &paint, bidiFlags, typeface, text, 0, count, count);
950        MinikinRect rect;
951        layout.getBounds(&rect);
952        r.fLeft = rect.mLeft;
953        r.fTop = rect.mTop;
954        r.fRight = rect.mRight;
955        r.fBottom = rect.mBottom;
956        r.roundOut(&ir);
957        GraphicsJNI::irect_to_jrect(ir, env, bounds);
958    }
959
960    static void getStringBounds(JNIEnv* env, jobject, jlong paintHandle, jlong typefaceHandle,
961                                jstring text, jint start, jint end, jint bidiFlags, jobject bounds) {
962        const Paint* paint = reinterpret_cast<Paint*>(paintHandle);;
963        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
964        const jchar* textArray = env->GetStringChars(text, NULL);
965        doTextBounds(env, textArray + start, end - start, bounds, *paint, typeface, bidiFlags);
966        env->ReleaseStringChars(text, textArray);
967    }
968
969    static void getCharArrayBounds(JNIEnv* env, jobject, jlong paintHandle, jlong typefaceHandle,
970                        jcharArray text, jint index, jint count, jint bidiFlags, jobject bounds) {
971        const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
972        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
973        const jchar* textArray = env->GetCharArrayElements(text, NULL);
974        doTextBounds(env, textArray + index, count, bounds, *paint, typeface, bidiFlags);
975        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
976                                      JNI_ABORT);
977    }
978
979    static jboolean layoutContainsNotdef(const Layout& layout) {
980        for (size_t i = 0; i < layout.nGlyphs(); i++) {
981            if (layout.getGlyphId(i) == 0) {
982                return true;
983            }
984        }
985        return false;
986    }
987
988    static jboolean hasGlyphVariation(const Paint* paint, TypefaceImpl* typeface, jint bidiFlags,
989            const jchar* chars, size_t size) {
990        // TODO: query font for whether character has variation selector; requires a corresponding
991        // function in Minikin.
992        return false;
993    }
994
995    static jboolean hasGlyph(JNIEnv *env, jclass, jlong paintHandle, jlong typefaceHandle,
996            jint bidiFlags, jstring string) {
997        const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
998        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
999        ScopedStringChars str(env, string);
1000
1001        /* start by rejecting variation selectors (not supported yet) */
1002        size_t nChars = 0;
1003        for (size_t i = 0; i < str.size(); i++) {
1004            jchar c = str[i];
1005            if (0xDC00 <= c && c <= 0xDFFF) {
1006                // invalid UTF-16, unpaired trailing surrogate
1007                return false;
1008            } else if (0xD800 <= c && c <= 0xDBFF) {
1009                if (i + 1 == str.size()) {
1010                    // invalid UTF-16, unpaired leading surrogate at end of string
1011                    return false;
1012                }
1013                i++;
1014                jchar c2 = str[i];
1015                if (!(0xDC00 <= c2 && c2 <= 0xDFFF)) {
1016                    // invalid UTF-16, unpaired leading surrogate
1017                    return false;
1018                }
1019                // UTF-16 encoding of range U+E0100..U+E01EF is DB40 DD00 .. DB40 DDEF
1020                if (c == 0xDB40 && 0xDD00 <= c2 && c2 <= 0xDDEF) {
1021                    return hasGlyphVariation(paint, typeface, bidiFlags, str.get(), str.size());
1022                }
1023            } else if (0xFE00 <= c && c <= 0xFE0F) {
1024                return hasGlyphVariation(paint, typeface, bidiFlags, str.get(), str.size());
1025            }
1026            nChars++;
1027        }
1028        Layout layout;
1029        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, str.get(), 0, str.size(),
1030                str.size());
1031        size_t nGlyphs = layout.nGlyphs();
1032        if (nGlyphs != 1 && nChars > 1) {
1033            // multiple-character input, and was not a ligature
1034            // TODO: handle ZWJ/ZWNJ characters specially so we can detect certain ligatures
1035            // in joining scripts, such as Arabic and Mongolian.
1036            return false;
1037        }
1038        return nGlyphs > 0 && !layoutContainsNotdef(layout);
1039    }
1040
1041    static jfloat doRunAdvance(const Paint* paint, TypefaceImpl* typeface, const jchar buf[],
1042            jint start, jint count, jint bufSize, jboolean isRtl, jint offset) {
1043        Layout layout;
1044        int bidiFlags = isRtl ? kBidi_Force_RTL : kBidi_Force_LTR;
1045        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, buf, start, count, bufSize);
1046        return getRunAdvance(layout, buf, start, count, offset);
1047    }
1048
1049    static jfloat getRunAdvance___CIIIIZI_F(JNIEnv *env, jclass, jlong paintHandle,
1050            jlong typefaceHandle, jcharArray text, jint start, jint end, jint contextStart,
1051            jint contextEnd, jboolean isRtl, jint offset) {
1052        const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
1053        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
1054        // TODO performance: optimize JNI array access
1055        jchar* textArray = env->GetCharArrayElements(text, NULL);
1056        jfloat result = doRunAdvance(paint, typeface, textArray + contextStart,
1057                start - contextStart, end - start, contextEnd - contextStart, isRtl, offset);
1058        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
1059        return result;
1060    }
1061
1062    static jint doOffsetForAdvance(const Paint* paint, TypefaceImpl* typeface, const jchar buf[],
1063            jint start, jint count, jint bufSize, jboolean isRtl, jfloat advance) {
1064        Layout layout;
1065        int bidiFlags = isRtl ? kBidi_Force_RTL : kBidi_Force_LTR;
1066        MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, buf, start, count, bufSize);
1067        return getOffsetForAdvance(layout, buf, start, count, advance);
1068    }
1069    static jint getOffsetForAdvance___CIIIIZF_I(JNIEnv *env, jclass, jlong paintHandle,
1070            jlong typefaceHandle, jcharArray text, jint start, jint end, jint contextStart,
1071            jint contextEnd, jboolean isRtl, jfloat advance) {
1072        const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
1073        TypefaceImpl* typeface = reinterpret_cast<TypefaceImpl*>(typefaceHandle);
1074        // TODO performance: optimize JNI array access
1075        jchar* textArray = env->GetCharArrayElements(text, NULL);
1076        jint result = doOffsetForAdvance(paint, typeface, textArray + contextStart,
1077                start - contextStart, end - start, contextEnd - contextStart, isRtl, advance);
1078        result += contextStart;
1079        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
1080        return result;
1081    }
1082
1083};
1084
1085static JNINativeMethod methods[] = {
1086    {"finalizer", "(J)V", (void*) PaintGlue::finalizer},
1087    {"native_init","()J", (void*) PaintGlue::init},
1088    {"native_initWithPaint","(J)J", (void*) PaintGlue::initWithPaint},
1089
1090    {"native_reset","!(J)V", (void*) PaintGlue::reset},
1091    {"native_set","!(JJ)V", (void*) PaintGlue::assign},
1092    {"getFlags","!()I", (void*) PaintGlue::getFlags},
1093    {"setFlags","!(I)V", (void*) PaintGlue::setFlags},
1094    {"getHinting","!()I", (void*) PaintGlue::getHinting},
1095    {"setHinting","!(I)V", (void*) PaintGlue::setHinting},
1096    {"setAntiAlias","!(Z)V", (void*) PaintGlue::setAntiAlias},
1097    {"setSubpixelText","!(Z)V", (void*) PaintGlue::setSubpixelText},
1098    {"setLinearText","!(Z)V", (void*) PaintGlue::setLinearText},
1099    {"setUnderlineText","!(Z)V", (void*) PaintGlue::setUnderlineText},
1100    {"setStrikeThruText","!(Z)V", (void*) PaintGlue::setStrikeThruText},
1101    {"setFakeBoldText","!(Z)V", (void*) PaintGlue::setFakeBoldText},
1102    {"setFilterBitmap","!(Z)V", (void*) PaintGlue::setFilterBitmap},
1103    {"setDither","!(Z)V", (void*) PaintGlue::setDither},
1104    {"native_getStyle","!(J)I", (void*) PaintGlue::getStyle},
1105    {"native_setStyle","!(JI)V", (void*) PaintGlue::setStyle},
1106    {"getColor","!()I", (void*) PaintGlue::getColor},
1107    {"setColor","!(I)V", (void*) PaintGlue::setColor},
1108    {"getAlpha","!()I", (void*) PaintGlue::getAlpha},
1109    {"setAlpha","!(I)V", (void*) PaintGlue::setAlpha},
1110    {"getStrokeWidth","!()F", (void*) PaintGlue::getStrokeWidth},
1111    {"setStrokeWidth","!(F)V", (void*) PaintGlue::setStrokeWidth},
1112    {"getStrokeMiter","!()F", (void*) PaintGlue::getStrokeMiter},
1113    {"setStrokeMiter","!(F)V", (void*) PaintGlue::setStrokeMiter},
1114    {"native_getStrokeCap","!(J)I", (void*) PaintGlue::getStrokeCap},
1115    {"native_setStrokeCap","!(JI)V", (void*) PaintGlue::setStrokeCap},
1116    {"native_getStrokeJoin","!(J)I", (void*) PaintGlue::getStrokeJoin},
1117    {"native_setStrokeJoin","!(JI)V", (void*) PaintGlue::setStrokeJoin},
1118    {"native_getFillPath","!(JJJ)Z", (void*) PaintGlue::getFillPath},
1119    {"native_setShader","!(JJ)J", (void*) PaintGlue::setShader},
1120    {"native_setColorFilter","!(JJ)J", (void*) PaintGlue::setColorFilter},
1121    {"native_setXfermode","!(JJ)J", (void*) PaintGlue::setXfermode},
1122    {"native_setPathEffect","!(JJ)J", (void*) PaintGlue::setPathEffect},
1123    {"native_setMaskFilter","!(JJ)J", (void*) PaintGlue::setMaskFilter},
1124    {"native_setTypeface","!(JJ)J", (void*) PaintGlue::setTypeface},
1125    {"native_setRasterizer","!(JJ)J", (void*) PaintGlue::setRasterizer},
1126    {"native_getTextAlign","!(J)I", (void*) PaintGlue::getTextAlign},
1127    {"native_setTextAlign","!(JI)V", (void*) PaintGlue::setTextAlign},
1128    {"native_setTextLocale","!(JLjava/lang/String;)V", (void*) PaintGlue::setTextLocale},
1129    {"isElegantTextHeight","!()Z", (void*) PaintGlue::isElegantTextHeight},
1130    {"setElegantTextHeight","!(Z)V", (void*) PaintGlue::setElegantTextHeight},
1131    {"getTextSize","!()F", (void*) PaintGlue::getTextSize},
1132    {"setTextSize","!(F)V", (void*) PaintGlue::setTextSize},
1133    {"getTextScaleX","!()F", (void*) PaintGlue::getTextScaleX},
1134    {"setTextScaleX","!(F)V", (void*) PaintGlue::setTextScaleX},
1135    {"getTextSkewX","!()F", (void*) PaintGlue::getTextSkewX},
1136    {"setTextSkewX","!(F)V", (void*) PaintGlue::setTextSkewX},
1137    {"native_getLetterSpacing","!(J)F", (void*) PaintGlue::getLetterSpacing},
1138    {"native_setLetterSpacing","!(JF)V", (void*) PaintGlue::setLetterSpacing},
1139    {"native_setFontFeatureSettings","(JLjava/lang/String;)V",
1140            (void*) PaintGlue::setFontFeatureSettings},
1141    {"native_getHyphenEdit", "!(J)I", (void*) PaintGlue::getHyphenEdit},
1142    {"native_setHyphenEdit", "!(JI)V", (void*) PaintGlue::setHyphenEdit},
1143    {"ascent","!()F", (void*) PaintGlue::ascent},
1144    {"descent","!()F", (void*) PaintGlue::descent},
1145
1146    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F",
1147            (void*)PaintGlue::getFontMetrics},
1148    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I",
1149            (void*)PaintGlue::getFontMetricsInt},
1150    {"native_measureText","([CIII)F", (void*) PaintGlue::measureText_CIII},
1151    {"native_measureText","(Ljava/lang/String;I)F", (void*) PaintGlue::measureText_StringI},
1152    {"native_measureText","(Ljava/lang/String;III)F", (void*) PaintGlue::measureText_StringIII},
1153    {"native_breakText","(JJ[CIIFI[F)I", (void*) PaintGlue::breakTextC},
1154    {"native_breakText","(JJLjava/lang/String;ZFI[F)I", (void*) PaintGlue::breakTextS},
1155    {"native_getTextWidths","(JJ[CIII[F)I", (void*) PaintGlue::getTextWidths___CIII_F},
1156    {"native_getTextWidths","(JJLjava/lang/String;III[F)I",
1157            (void*) PaintGlue::getTextWidths__StringIII_F},
1158    {"native_getTextRunAdvances","(JJ[CIIIIZ[FI)F",
1159            (void*) PaintGlue::getTextRunAdvances___CIIIIZ_FI},
1160    {"native_getTextRunAdvances","(JJLjava/lang/String;IIIIZ[FI)F",
1161            (void*) PaintGlue::getTextRunAdvances__StringIIIIZ_FI},
1162
1163    {"native_getTextRunCursor", "(J[CIIIII)I", (void*) PaintGlue::getTextRunCursor___C},
1164    {"native_getTextRunCursor", "(JLjava/lang/String;IIIII)I",
1165            (void*) PaintGlue::getTextRunCursor__String},
1166    {"native_getTextPath", "(JJI[CIIFFJ)V", (void*) PaintGlue::getTextPath___C},
1167    {"native_getTextPath", "(JJILjava/lang/String;IIFFJ)V", (void*) PaintGlue::getTextPath__String},
1168    {"nativeGetStringBounds", "(JJLjava/lang/String;IIILandroid/graphics/Rect;)V",
1169            (void*) PaintGlue::getStringBounds },
1170    {"nativeGetCharArrayBounds", "(JJ[CIIILandroid/graphics/Rect;)V",
1171            (void*) PaintGlue::getCharArrayBounds },
1172    {"native_hasGlyph", "(JJILjava/lang/String;)Z", (void*) PaintGlue::hasGlyph },
1173    {"native_getRunAdvance", "(JJ[CIIIIZI)F", (void*) PaintGlue::getRunAdvance___CIIIIZI_F},
1174    {"native_getOffsetForAdvance", "(JJ[CIIIIZF)I",
1175            (void*) PaintGlue::getOffsetForAdvance___CIIIIZF_I},
1176
1177    {"native_setShadowLayer", "!(JFFFI)V", (void*)PaintGlue::setShadowLayer},
1178    {"native_hasShadowLayer", "!(J)Z", (void*)PaintGlue::hasShadowLayer}
1179};
1180
1181int register_android_graphics_Paint(JNIEnv* env) {
1182    gFontMetrics_class = FindClassOrDie(env, "android/graphics/Paint$FontMetrics");
1183    gFontMetrics_class = MakeGlobalRefOrDie(env, gFontMetrics_class);
1184
1185    gFontMetrics_fieldID.top = GetFieldIDOrDie(env, gFontMetrics_class, "top", "F");
1186    gFontMetrics_fieldID.ascent = GetFieldIDOrDie(env, gFontMetrics_class, "ascent", "F");
1187    gFontMetrics_fieldID.descent = GetFieldIDOrDie(env, gFontMetrics_class, "descent", "F");
1188    gFontMetrics_fieldID.bottom = GetFieldIDOrDie(env, gFontMetrics_class, "bottom", "F");
1189    gFontMetrics_fieldID.leading = GetFieldIDOrDie(env, gFontMetrics_class, "leading", "F");
1190
1191    gFontMetricsInt_class = FindClassOrDie(env, "android/graphics/Paint$FontMetricsInt");
1192    gFontMetricsInt_class = MakeGlobalRefOrDie(env, gFontMetricsInt_class);
1193
1194    gFontMetricsInt_fieldID.top = GetFieldIDOrDie(env, gFontMetricsInt_class, "top", "I");
1195    gFontMetricsInt_fieldID.ascent = GetFieldIDOrDie(env, gFontMetricsInt_class, "ascent", "I");
1196    gFontMetricsInt_fieldID.descent = GetFieldIDOrDie(env, gFontMetricsInt_class, "descent", "I");
1197    gFontMetricsInt_fieldID.bottom = GetFieldIDOrDie(env, gFontMetricsInt_class, "bottom", "I");
1198    gFontMetricsInt_fieldID.leading = GetFieldIDOrDie(env, gFontMetricsInt_class, "leading", "I");
1199
1200    gPaint_class = MakeGlobalRefOrDie(env, FindClassOrDie(env, "android/graphics/Paint"));
1201    gPaint_nativeInstanceID = GetFieldIDOrDie(env, gPaint_class, "mNativePaint", "J");
1202    gPaint_nativeTypefaceID = GetFieldIDOrDie(env, gPaint_class, "mNativeTypeface", "J");
1203
1204    return RegisterMethodsOrDie(env, "android/graphics/Paint", methods, NELEM(methods));
1205}
1206
1207}
1208