Paint.cpp revision b644a3b84521e2155a5af985a4d4ed305474e567 
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, jlong objHandle) {
74        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
75        delete obj;
76    }
77
78    static jlong init(JNIEnv* env, jobject clazz) {
79        SkPaint* obj = new SkPaint();
80        defaultSettingsForAndroid(obj);
81        return reinterpret_cast<jlong>(obj);
82    }
83
84    static jlong initWithPaint(JNIEnv* env, jobject clazz, jlong paintHandle) {
85        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
86        SkPaint* obj = new SkPaint(*paint);
87        return reinterpret_cast<jlong>(obj);
88    }
89
90    static void reset(JNIEnv* env, jobject clazz, jlong objHandle) {
91        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
92        obj->reset();
93        defaultSettingsForAndroid(obj);
94    }
95
96    static void assign(JNIEnv* env, jobject clazz, jlong dstPaintHandle, jlong srcPaintHandle) {
97        SkPaint* dst = reinterpret_cast<SkPaint*>(dstPaintHandle);
98        const SkPaint* src = reinterpret_cast<SkPaint*>(srcPaintHandle);
99        *dst = *src;
100    }
101
102    static jint getFlags(JNIEnv* env, jobject paint) {
103        NPE_CHECK_RETURN_ZERO(env, paint);
104        int result;
105        result = GraphicsJNI::getNativePaint(env, paint)->getFlags();
106        return static_cast<jint>(result);
107    }
108
109    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
112    }
113
114    static jint getHinting(JNIEnv* env, jobject paint) {
115        NPE_CHECK_RETURN_ZERO(env, paint);
116        return GraphicsJNI::getNativePaint(env, paint)->getHinting()
117                == SkPaint::kNo_Hinting ? 0 : 1;
118    }
119
120    static void setHinting(JNIEnv* env, jobject paint, jint mode) {
121        NPE_CHECK_RETURN_VOID(env, paint);
122        GraphicsJNI::getNativePaint(env, paint)->setHinting(
123                mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kNormal_Hinting);
124    }
125
126    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
127        NPE_CHECK_RETURN_VOID(env, paint);
128        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
129    }
130
131    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
132        NPE_CHECK_RETURN_VOID(env, paint);
133        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
134    }
135
136    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
137        NPE_CHECK_RETURN_VOID(env, paint);
138        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
139    }
140
141    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
142        NPE_CHECK_RETURN_VOID(env, paint);
143        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
144    }
145
146    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
147        NPE_CHECK_RETURN_VOID(env, paint);
148        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
149    }
150
151    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
152        NPE_CHECK_RETURN_VOID(env, paint);
153        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
154    }
155
156    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
157        NPE_CHECK_RETURN_VOID(env, paint);
158        GraphicsJNI::getNativePaint(env, paint)->setFilterLevel(
159                filterBitmap ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
160    }
161
162    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
163        NPE_CHECK_RETURN_VOID(env, paint);
164        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
165    }
166
167    static jint getStyle(JNIEnv* env, jobject clazz,jlong objHandle) {
168        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
169        return static_cast<jint>(obj->getStyle());
170    }
171
172    static void setStyle(JNIEnv* env, jobject clazz, jlong objHandle, jint styleHandle) {
173        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
174        SkPaint::Style style = static_cast<SkPaint::Style>(styleHandle);
175        obj->setStyle(style);
176    }
177
178    static jint getColor(JNIEnv* env, jobject paint) {
179        NPE_CHECK_RETURN_ZERO(env, paint);
180        int color;
181        color = GraphicsJNI::getNativePaint(env, paint)->getColor();
182        return static_cast<jint>(color);
183    }
184
185    static jint getAlpha(JNIEnv* env, jobject paint) {
186        NPE_CHECK_RETURN_ZERO(env, paint);
187        int alpha;
188        alpha = GraphicsJNI::getNativePaint(env, paint)->getAlpha();
189        return static_cast<jint>(alpha);
190    }
191
192    static void setColor(JNIEnv* env, jobject paint, jint color) {
193        NPE_CHECK_RETURN_VOID(env, paint);
194        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
195    }
196
197    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
198        NPE_CHECK_RETURN_VOID(env, paint);
199        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
200    }
201
202    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
203        NPE_CHECK_RETURN_ZERO(env, paint);
204        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
205    }
206
207    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
208        NPE_CHECK_RETURN_VOID(env, paint);
209        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
210    }
211
212    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
213        NPE_CHECK_RETURN_ZERO(env, paint);
214        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
215    }
216
217    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
218        NPE_CHECK_RETURN_VOID(env, paint);
219        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
220    }
221
222    static jint getStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle) {
223        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
224        return static_cast<jint>(obj->getStrokeCap());
225    }
226
227    static void setStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle, jint capHandle) {
228        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
229        SkPaint::Cap cap = static_cast<SkPaint::Cap>(capHandle);
230        obj->setStrokeCap(cap);
231    }
232
233    static jint getStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle) {
234        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
235        return static_cast<jint>(obj->getStrokeJoin());
236    }
237
238    static void setStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle, jint joinHandle) {
239        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
240        SkPaint::Join join = (SkPaint::Join) joinHandle;
241        obj->setStrokeJoin(join);
242    }
243
244    static jboolean getFillPath(JNIEnv* env, jobject clazz, jlong objHandle, jlong srcHandle, jlong dstHandle) {
245        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
246        SkPath* src = reinterpret_cast<SkPath*>(srcHandle);
247        SkPath* dst = reinterpret_cast<SkPath*>(dstHandle);
248        return obj->getFillPath(*src, dst) ? JNI_TRUE : JNI_FALSE;
249    }
250
251    static jlong setShader(JNIEnv* env, jobject clazz, jlong objHandle, jlong shaderHandle) {
252        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
253        SkShader* shader = reinterpret_cast<SkShader*>(shaderHandle);
254        return reinterpret_cast<jlong>(obj->setShader(shader));
255    }
256
257    static jlong setColorFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong filterHandle) {
258        SkPaint* obj = reinterpret_cast<SkPaint *>(objHandle);
259        SkColorFilter* filter  = reinterpret_cast<SkColorFilter *>(filterHandle);
260        return reinterpret_cast<jlong>(obj->setColorFilter(filter));
261    }
262
263    static jlong setXfermode(JNIEnv* env, jobject clazz, jlong objHandle, jlong xfermodeHandle) {
264        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
265        SkXfermode* xfermode = reinterpret_cast<SkXfermode*>(xfermodeHandle);
266        return reinterpret_cast<jlong>(obj->setXfermode(xfermode));
267    }
268
269    static jlong setPathEffect(JNIEnv* env, jobject clazz, jlong objHandle, jlong effectHandle) {
270        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
271        SkPathEffect* effect  = reinterpret_cast<SkPathEffect*>(effectHandle);
272        return reinterpret_cast<jlong>(obj->setPathEffect(effect));
273    }
274
275    static jlong setMaskFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong maskfilterHandle) {
276        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
277        SkMaskFilter* maskfilter  = reinterpret_cast<SkMaskFilter*>(maskfilterHandle);
278        return reinterpret_cast<jlong>(obj->setMaskFilter(maskfilter));
279    }
280
281    static jlong setTypeface(JNIEnv* env, jobject clazz, jlong objHandle, jlong typefaceHandle) {
282#ifndef USE_MINIKIN
283        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
284        SkTypeface* typeface = reinterpret_cast<SkTypeface*>(typefaceHandle);
285        return reinterpret_cast<jlong>(obj->setTypeface(typeface));
286#else
287        // TODO(raph): not yet implemented
288        return NULL;
289#endif
290    }
291
292    static jlong setRasterizer(JNIEnv* env, jobject clazz, jlong objHandle, jlong rasterizerHandle) {
293        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
294        SkRasterizer* rasterizer = reinterpret_cast<SkRasterizer*>(rasterizerHandle);
295        return reinterpret_cast<jlong>(obj->setRasterizer(rasterizer));
296    }
297
298    static jint getTextAlign(JNIEnv* env, jobject clazz, jlong objHandle) {
299        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
300        return static_cast<jint>(obj->getTextAlign());
301    }
302
303    static void setTextAlign(JNIEnv* env, jobject clazz, jlong objHandle, jint alignHandle) {
304        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
305        SkPaint::Align align = static_cast<SkPaint::Align>(alignHandle);
306        obj->setTextAlign(align);
307    }
308
309    // generate bcp47 identifier for the supplied locale
310    static void toLanguageTag(char* output, size_t outSize,
311            const char* locale) {
312        if (output == NULL || outSize <= 0) {
313            return;
314        }
315        if (locale == NULL) {
316            output[0] = '\0';
317            return;
318        }
319        char canonicalChars[ULOC_FULLNAME_CAPACITY];
320        UErrorCode uErr = U_ZERO_ERROR;
321        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
322                &uErr);
323        if (U_SUCCESS(uErr)) {
324            char likelyChars[ULOC_FULLNAME_CAPACITY];
325            uErr = U_ZERO_ERROR;
326            uloc_addLikelySubtags(canonicalChars, likelyChars,
327                    ULOC_FULLNAME_CAPACITY, &uErr);
328            if (U_SUCCESS(uErr)) {
329                uErr = U_ZERO_ERROR;
330                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
331                if (U_SUCCESS(uErr)) {
332                    return;
333                } else {
334                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
335                            u_errorName(uErr));
336                }
337            } else {
338                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
339                        canonicalChars, u_errorName(uErr));
340            }
341        } else {
342            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
343                    u_errorName(uErr));
344        }
345        // unable to build a proper language identifier
346        output[0] = '\0';
347    }
348
349    static void setTextLocale(JNIEnv* env, jobject clazz, jlong objHandle, jstring locale) {
350        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
351        ScopedUtfChars localeChars(env, locale);
352        char langTag[ULOC_FULLNAME_CAPACITY];
353        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
354
355        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
356        paintOpts.setLanguage(langTag);
357        obj->setPaintOptionsAndroid(paintOpts);
358    }
359
360    static jfloat getTextSize(JNIEnv* env, jobject paint) {
361        NPE_CHECK_RETURN_ZERO(env, paint);
362        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
363    }
364
365    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
366        NPE_CHECK_RETURN_VOID(env, paint);
367        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
368    }
369
370    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
371        NPE_CHECK_RETURN_ZERO(env, paint);
372        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
373    }
374
375    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
376        NPE_CHECK_RETURN_VOID(env, paint);
377        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
378    }
379
380    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
381        NPE_CHECK_RETURN_ZERO(env, paint);
382        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
383    }
384
385    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
386        NPE_CHECK_RETURN_VOID(env, paint);
387        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
388    }
389
390    static jfloat ascent(JNIEnv* env, jobject paint) {
391        NPE_CHECK_RETURN_ZERO(env, paint);
392        SkPaint::FontMetrics    metrics;
393        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
394        return SkScalarToFloat(metrics.fAscent);
395    }
396
397    static jfloat descent(JNIEnv* env, jobject paint) {
398        NPE_CHECK_RETURN_ZERO(env, paint);
399        SkPaint::FontMetrics    metrics;
400        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
401        return SkScalarToFloat(metrics.fDescent);
402    }
403
404    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
405        NPE_CHECK_RETURN_ZERO(env, paint);
406        SkPaint::FontMetrics metrics;
407        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
408
409        if (metricsObj) {
410            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
411            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
412            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
413            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
414            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
415            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
416        }
417        return SkScalarToFloat(spacing);
418    }
419
420    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
421        NPE_CHECK_RETURN_ZERO(env, paint);
422        SkPaint::FontMetrics metrics;
423
424        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
425        int ascent = SkScalarRound(metrics.fAscent);
426        int descent = SkScalarRound(metrics.fDescent);
427        int leading = SkScalarRound(metrics.fLeading);
428
429        if (metricsObj) {
430            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
431            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
432            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
433            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
434            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
435            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
436        }
437        return descent - ascent + leading;
438    }
439
440    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, jint index, jint count,
441            jint bidiFlags) {
442        NPE_CHECK_RETURN_ZERO(env, jpaint);
443        NPE_CHECK_RETURN_ZERO(env, text);
444
445        size_t textLength = env->GetArrayLength(text);
446        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
447            doThrowAIOOBE(env);
448            return 0;
449        }
450        if (count == 0) {
451            return 0;
452        }
453
454        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
455        const jchar* textArray = env->GetCharArrayElements(text, NULL);
456        jfloat result = 0;
457
458        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
459                bidiFlags, NULL /* dont need all advances */, &result);
460
461        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
462        return result;
463    }
464
465    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, jint start, jint end,
466            jint bidiFlags) {
467        NPE_CHECK_RETURN_ZERO(env, jpaint);
468        NPE_CHECK_RETURN_ZERO(env, text);
469
470        size_t textLength = env->GetStringLength(text);
471        int count = end - start;
472        if ((start | count) < 0 || (size_t)end > textLength) {
473            doThrowAIOOBE(env);
474            return 0;
475        }
476        if (count == 0) {
477            return 0;
478        }
479
480        const jchar* textArray = env->GetStringChars(text, NULL);
481        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
482        jfloat width = 0;
483
484        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
485                bidiFlags, NULL /* dont need all advances */, &width);
486
487        env->ReleaseStringChars(text, textArray);
488        return width;
489    }
490
491    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
492        NPE_CHECK_RETURN_ZERO(env, jpaint);
493        NPE_CHECK_RETURN_ZERO(env, text);
494
495        size_t textLength = env->GetStringLength(text);
496        if (textLength == 0) {
497            return 0;
498        }
499
500        const jchar* textArray = env->GetStringChars(text, NULL);
501        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
502        jfloat width = 0;
503
504        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
505                bidiFlags, NULL /* dont need all advances */, &width);
506
507        env->ReleaseStringChars(text, textArray);
508        return width;
509    }
510
511    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
512            jint bidiFlags) {
513        NPE_CHECK_RETURN_ZERO(env, paint);
514        NPE_CHECK_RETURN_ZERO(env, text);
515
516        if (count < 0 || !widths) {
517            doThrowAIOOBE(env);
518            return 0;
519        }
520        if (count == 0) {
521            return 0;
522        }
523        size_t widthsLength = env->GetArrayLength(widths);
524        if ((size_t)count > widthsLength) {
525            doThrowAIOOBE(env);
526            return 0;
527        }
528
529        AutoJavaFloatArray autoWidths(env, widths, count);
530        jfloat* widthsArray = autoWidths.ptr();
531
532        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
533                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
534
535        return count;
536    }
537
538    static jint getTextWidths___CIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
539            jint index, jint count, jint bidiFlags, jfloatArray widths) {
540        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
541        const jchar* textArray = env->GetCharArrayElements(text, NULL);
542        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
543        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
544                                      JNI_ABORT);
545        return count;
546    }
547
548    static jint getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
549            jint start, jint end, jint bidiFlags, jfloatArray widths) {
550        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
551        const jchar* textArray = env->GetStringChars(text, NULL);
552        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
553        env->ReleaseStringChars(text, textArray);
554        return count;
555    }
556
557    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
558            jint contextCount, jint flags, jcharArray glyphs) {
559        NPE_CHECK_RETURN_ZERO(env, paint);
560        NPE_CHECK_RETURN_ZERO(env, text);
561
562        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
563            doThrowAIOOBE(env);
564            return 0;
565        }
566        if (count == 0) {
567            return 0;
568        }
569        size_t glypthsLength = env->GetArrayLength(glyphs);
570        if ((size_t)count > glypthsLength) {
571            doThrowAIOOBE(env);
572            return 0;
573        }
574
575        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
576
577        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
578                text, start, count, contextCount, flags);
579        const jchar* shapedGlyphs = value->getGlyphs();
580        size_t glyphsCount = value->getGlyphsCount();
581        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
582
583        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
584        return glyphsCount;
585    }
586
587    static jint getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, jlong paintHandle,
588            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
589            jcharArray glyphs) {
590        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
591        const jchar* textArray = env->GetStringChars(text, NULL);
592        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
593                end - start, contextEnd - contextStart, flags, glyphs);
594        env->ReleaseStringChars(text, textArray);
595        return count;
596    }
597
598    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
599                                    jint start, jint count, jint contextCount, jint flags,
600                                    jfloatArray advances, jint advancesIndex) {
601        NPE_CHECK_RETURN_ZERO(env, paint);
602        NPE_CHECK_RETURN_ZERO(env, text);
603
604        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
605            doThrowAIOOBE(env);
606            return 0;
607        }
608        if (count == 0) {
609            return 0;
610        }
611        if (advances) {
612            size_t advancesLength = env->GetArrayLength(advances);
613            if ((size_t)count > advancesLength) {
614                doThrowAIOOBE(env);
615                return 0;
616            }
617        }
618        jfloat advancesArray[count];
619        jfloat totalAdvance = 0;
620
621        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
622                                       advancesArray, &totalAdvance);
623
624        if (advances != NULL) {
625            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
626        }
627        return totalAdvance;
628    }
629
630    static jfloat getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
631            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
632            jint flags, jfloatArray advances, jint advancesIndex) {
633        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
634        jchar* textArray = env->GetCharArrayElements(text, NULL);
635        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
636                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
637        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
638        return result;
639    }
640
641    static jfloat getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
642            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
643            jfloatArray advances, jint advancesIndex) {
644        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
645        const jchar* textArray = env->GetStringChars(text, NULL);
646        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
647                start - contextStart, end - start, contextEnd - contextStart, flags,
648                advances, advancesIndex);
649        env->ReleaseStringChars(text, textArray);
650        return result;
651    }
652
653    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
654            jint count, jint flags, jint offset, jint opt) {
655        jfloat scalarArray[count];
656
657        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
658                scalarArray, NULL /* dont need totalAdvance */);
659
660        jint pos = offset - start;
661        switch (opt) {
662        case AFTER:
663          if (pos < count) {
664            pos += 1;
665          }
666          // fall through
667        case AT_OR_AFTER:
668          while (pos < count && scalarArray[pos] == 0) {
669            ++pos;
670          }
671          break;
672        case BEFORE:
673          if (pos > 0) {
674            --pos;
675          }
676          // fall through
677        case AT_OR_BEFORE:
678          while (pos > 0 && scalarArray[pos] == 0) {
679            --pos;
680          }
681          break;
682        case AT:
683        default:
684          if (scalarArray[pos] == 0) {
685            pos = -1;
686          }
687          break;
688        }
689
690        if (pos != -1) {
691          pos += start;
692        }
693
694        return pos;
695    }
696
697    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
698            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
699        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
700        jchar* textArray = env->GetCharArrayElements(text, NULL);
701        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
702                offset, cursorOpt);
703        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
704        return result;
705    }
706
707    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
708            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
709        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
710        const jchar* textArray = env->GetStringChars(text, NULL);
711        jint result = doTextRunCursor(env, paint, textArray, contextStart,
712                contextEnd - contextStart, flags, offset, cursorOpt);
713        env->ReleaseStringChars(text, textArray);
714        return result;
715    }
716
717    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
718                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
719        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
720    }
721
722    static void getTextPath___C(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
723            jcharArray text, jint index, jint count, jfloat x, jfloat y, jlong pathHandle) {
724        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
725        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
726        const jchar* textArray = env->GetCharArrayElements(text, NULL);
727        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
728        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
729    }
730
731    static void getTextPath__String(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
732            jstring text, jint start, jint end, jfloat x, jfloat y, jlong pathHandle) {
733        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
734        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
735        const jchar* textArray = env->GetStringChars(text, NULL);
736        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
737        env->ReleaseStringChars(text, textArray);
738    }
739
740    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
741                               jfloat dx, jfloat dy, jint color) {
742        NPE_CHECK_RETURN_VOID(env, jpaint);
743
744        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
745        if (radius <= 0) {
746            paint->setLooper(NULL);
747        }
748        else {
749            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
750                                                  SkFloatToScalar(dx),
751                                                  SkFloatToScalar(dy),
752                                                  (SkColor)color))->unref();
753        }
754    }
755
756    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
757                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
758                         SkPaint::TextBufferDirection tbd) {
759        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
760                text, 0, count, count, bidiFlags);
761        if (value == NULL) {
762            return 0;
763        }
764        SkScalar     measured;
765        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
766                                   SkFloatToScalar(maxWidth), &measured, tbd);
767        SkASSERT((bytes & 1) == 0);
768
769        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
770            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
771            jfloat* array = autoMeasured.ptr();
772            array[0] = SkScalarToFloat(measured);
773        }
774        return bytes >> 1;
775    }
776
777    static jint breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
778            jint index, jint count, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
779        NPE_CHECK_RETURN_ZERO(env, jpaint);
780        NPE_CHECK_RETURN_ZERO(env, jtext);
781
782        SkPaint::TextBufferDirection tbd;
783        if (count < 0) {
784            tbd = SkPaint::kBackward_TextBufferDirection;
785            count = -count;
786        }
787        else {
788            tbd = SkPaint::kForward_TextBufferDirection;
789        }
790
791        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
792            doThrowAIOOBE(env);
793            return 0;
794        }
795
796        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
797        const jchar* text = env->GetCharArrayElements(jtext, NULL);
798        count = breakText(env, *paint, text + index, count, maxWidth,
799                          bidiFlags, jmeasuredWidth, tbd);
800        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
801                                      JNI_ABORT);
802        return count;
803    }
804
805    static jint breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
806                jboolean forwards, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
807        NPE_CHECK_RETURN_ZERO(env, jpaint);
808        NPE_CHECK_RETURN_ZERO(env, jtext);
809
810        SkPaint::TextBufferDirection tbd = forwards ?
811                                        SkPaint::kForward_TextBufferDirection :
812                                        SkPaint::kBackward_TextBufferDirection;
813
814        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
815        int count = env->GetStringLength(jtext);
816        const jchar* text = env->GetStringChars(jtext, NULL);
817        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
818        env->ReleaseStringChars(jtext, text);
819        return count;
820    }
821
822    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
823                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
824        SkRect  r;
825        SkIRect ir;
826
827        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
828                text, 0, count, count, bidiFlags);
829        if (value == NULL) {
830            return;
831        }
832        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
833        r.roundOut(&ir);
834        GraphicsJNI::irect_to_jrect(ir, env, bounds);
835    }
836
837    static void getStringBounds(JNIEnv* env, jobject, jlong paintHandle,
838                                jstring text, jint start, jint end, jint bidiFlags, jobject bounds) {
839        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);;
840        const jchar* textArray = env->GetStringChars(text, NULL);
841        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
842        env->ReleaseStringChars(text, textArray);
843    }
844
845    static void getCharArrayBounds(JNIEnv* env, jobject, jlong paintHandle,
846                        jcharArray text, jint index, jint count, jint bidiFlags, jobject bounds) {
847        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
848        const jchar* textArray = env->GetCharArrayElements(text, NULL);
849        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
850        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
851                                      JNI_ABORT);
852    }
853
854};
855
856static JNINativeMethod methods[] = {
857    {"finalizer", "(J)V", (void*) SkPaintGlue::finalizer},
858    {"native_init","()J", (void*) SkPaintGlue::init},
859    {"native_initWithPaint","(J)J", (void*) SkPaintGlue::initWithPaint},
860    {"native_reset","(J)V", (void*) SkPaintGlue::reset},
861    {"native_set","(JJ)V", (void*) SkPaintGlue::assign},
862    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
863    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
864    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
865    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
866    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
867    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
868    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
869    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
870    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
871    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
872    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
873    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
874    {"native_getStyle","(J)I", (void*) SkPaintGlue::getStyle},
875    {"native_setStyle","(JI)V", (void*) SkPaintGlue::setStyle},
876    {"getColor","()I", (void*) SkPaintGlue::getColor},
877    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
878    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
879    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
880    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
881    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
882    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
883    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
884    {"native_getStrokeCap","(J)I", (void*) SkPaintGlue::getStrokeCap},
885    {"native_setStrokeCap","(JI)V", (void*) SkPaintGlue::setStrokeCap},
886    {"native_getStrokeJoin","(J)I", (void*) SkPaintGlue::getStrokeJoin},
887    {"native_setStrokeJoin","(JI)V", (void*) SkPaintGlue::setStrokeJoin},
888    {"native_getFillPath","(JJJ)Z", (void*) SkPaintGlue::getFillPath},
889    {"native_setShader","(JJ)J", (void*) SkPaintGlue::setShader},
890    {"native_setColorFilter","(JJ)J", (void*) SkPaintGlue::setColorFilter},
891    {"native_setXfermode","(JJ)J", (void*) SkPaintGlue::setXfermode},
892    {"native_setPathEffect","(JJ)J", (void*) SkPaintGlue::setPathEffect},
893    {"native_setMaskFilter","(JJ)J", (void*) SkPaintGlue::setMaskFilter},
894    {"native_setTypeface","(JJ)J", (void*) SkPaintGlue::setTypeface},
895    {"native_setRasterizer","(JJ)J", (void*) SkPaintGlue::setRasterizer},
896    {"native_getTextAlign","(J)I", (void*) SkPaintGlue::getTextAlign},
897    {"native_setTextAlign","(JI)V", (void*) SkPaintGlue::setTextAlign},
898    {"native_setTextLocale","(JLjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
899    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
900    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
901    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
902    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
903    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
904    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
905    {"ascent","()F", (void*) SkPaintGlue::ascent},
906    {"descent","()F", (void*) SkPaintGlue::descent},
907    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
908    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
909    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
910    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
911    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
912    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
913    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
914    {"native_getTextWidths","(J[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
915    {"native_getTextWidths","(JLjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
916    {"native_getTextRunAdvances","(J[CIIIII[FI)F",
917        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
918    {"native_getTextRunAdvances","(JLjava/lang/String;IIIII[FI)F",
919        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
920
921
922    {"native_getTextGlyphs","(JLjava/lang/String;IIIII[C)I",
923        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
924    {"native_getTextRunCursor", "(J[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
925    {"native_getTextRunCursor", "(JLjava/lang/String;IIIII)I",
926        (void*) SkPaintGlue::getTextRunCursor__String},
927    {"native_getTextPath","(JI[CIIFFJ)V", (void*) SkPaintGlue::getTextPath___C},
928    {"native_getTextPath","(JILjava/lang/String;IIFFJ)V", (void*) SkPaintGlue::getTextPath__String},
929    {"nativeGetStringBounds", "(JLjava/lang/String;IIILandroid/graphics/Rect;)V",
930                                        (void*) SkPaintGlue::getStringBounds },
931    {"nativeGetCharArrayBounds", "(J[CIIILandroid/graphics/Rect;)V",
932                                    (void*) SkPaintGlue::getCharArrayBounds },
933    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
934};
935
936static jfieldID req_fieldID(jfieldID id) {
937    SkASSERT(id);
938    return id;
939}
940
941int register_android_graphics_Paint(JNIEnv* env) {
942    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
943    SkASSERT(gFontMetrics_class);
944    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
945
946    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
947    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
948    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
949    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
950    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
951
952    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
953    SkASSERT(gFontMetricsInt_class);
954    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
955
956    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
957    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
958    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
959    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
960    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
961
962    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
963        sizeof(methods) / sizeof(methods[0]));
964    return result;
965}
966
967}
968