Paint.cpp revision a0398430fcf365fba6e42ad0bdca2fbf45ed6fe0 
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)->setFilterBitmap(filterBitmap);
159    }
160
161    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
162        NPE_CHECK_RETURN_VOID(env, paint);
163        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
164    }
165
166    static jint getStyle(JNIEnv* env, jobject clazz,jlong objHandle) {
167        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
168        return static_cast<jint>(obj->getStyle());
169    }
170
171    static void setStyle(JNIEnv* env, jobject clazz, jlong objHandle, jint styleHandle) {
172        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
173        SkPaint::Style style = static_cast<SkPaint::Style>(styleHandle);
174        obj->setStyle(style);
175    }
176
177    static jint getColor(JNIEnv* env, jobject paint) {
178        NPE_CHECK_RETURN_ZERO(env, paint);
179        int color;
180        color = GraphicsJNI::getNativePaint(env, paint)->getColor();
181        return static_cast<jint>(color);
182    }
183
184    static jint getAlpha(JNIEnv* env, jobject paint) {
185        NPE_CHECK_RETURN_ZERO(env, paint);
186        int alpha;
187        alpha = GraphicsJNI::getNativePaint(env, paint)->getAlpha();
188        return static_cast<jint>(alpha);
189    }
190
191    static void setColor(JNIEnv* env, jobject paint, jint color) {
192        NPE_CHECK_RETURN_VOID(env, paint);
193        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
194    }
195
196    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
197        NPE_CHECK_RETURN_VOID(env, paint);
198        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
199    }
200
201    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
202        NPE_CHECK_RETURN_ZERO(env, paint);
203        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
204    }
205
206    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
207        NPE_CHECK_RETURN_VOID(env, paint);
208        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
209    }
210
211    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
212        NPE_CHECK_RETURN_ZERO(env, paint);
213        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
214    }
215
216    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
217        NPE_CHECK_RETURN_VOID(env, paint);
218        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
219    }
220
221    static jint getStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle) {
222        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
223        return static_cast<jint>(obj->getStrokeCap());
224    }
225
226    static void setStrokeCap(JNIEnv* env, jobject clazz, jlong objHandle, jint capHandle) {
227        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
228        SkPaint::Cap cap = static_cast<SkPaint::Cap>(capHandle);
229        obj->setStrokeCap(cap);
230    }
231
232    static jint getStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle) {
233        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
234        return static_cast<jint>(obj->getStrokeJoin());
235    }
236
237    static void setStrokeJoin(JNIEnv* env, jobject clazz, jlong objHandle, jint joinHandle) {
238        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
239        SkPaint::Join join = (SkPaint::Join) joinHandle;
240        obj->setStrokeJoin(join);
241    }
242
243    static jboolean getFillPath(JNIEnv* env, jobject clazz, jlong objHandle, jlong srcHandle, jlong dstHandle) {
244        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
245        SkPath* src = reinterpret_cast<SkPath*>(srcHandle);
246        SkPath* dst = reinterpret_cast<SkPath*>(dstHandle);
247        return obj->getFillPath(*src, dst) ? JNI_TRUE : JNI_FALSE;
248    }
249
250    static jlong setShader(JNIEnv* env, jobject clazz, jlong objHandle, jlong shaderHandle) {
251        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
252        SkShader* shader = reinterpret_cast<SkShader*>(shaderHandle);
253        return reinterpret_cast<jlong>(obj->setShader(shader));
254    }
255
256    static jlong setColorFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong filterHandle) {
257        SkPaint* obj = reinterpret_cast<SkPaint *>(objHandle);
258        SkColorFilter* filter  = reinterpret_cast<SkColorFilter *>(filterHandle);
259        return reinterpret_cast<jlong>(obj->setColorFilter(filter));
260    }
261
262    static jlong setXfermode(JNIEnv* env, jobject clazz, jlong objHandle, jlong xfermodeHandle) {
263        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
264        SkXfermode* xfermode = reinterpret_cast<SkXfermode*>(xfermodeHandle);
265        return reinterpret_cast<jlong>(obj->setXfermode(xfermode));
266    }
267
268    static jlong setPathEffect(JNIEnv* env, jobject clazz, jlong objHandle, jlong effectHandle) {
269        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
270        SkPathEffect* effect  = reinterpret_cast<SkPathEffect*>(effectHandle);
271        return reinterpret_cast<jlong>(obj->setPathEffect(effect));
272    }
273
274    static jlong setMaskFilter(JNIEnv* env, jobject clazz, jlong objHandle, jlong maskfilterHandle) {
275        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
276        SkMaskFilter* maskfilter  = reinterpret_cast<SkMaskFilter*>(maskfilterHandle);
277        return reinterpret_cast<jlong>(obj->setMaskFilter(maskfilter));
278    }
279
280    static jlong setTypeface(JNIEnv* env, jobject clazz, jlong objHandle, jlong typefaceHandle) {
281        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
282        SkTypeface* typeface = reinterpret_cast<SkTypeface*>(typefaceHandle);
283        return reinterpret_cast<jlong>(obj->setTypeface(typeface));
284    }
285
286    static jlong setRasterizer(JNIEnv* env, jobject clazz, jlong objHandle, jlong rasterizerHandle) {
287        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
288        SkRasterizer* rasterizer = reinterpret_cast<SkRasterizer*>(rasterizerHandle);
289        return reinterpret_cast<jlong>(obj->setRasterizer(rasterizer));
290    }
291
292    static jint getTextAlign(JNIEnv* env, jobject clazz, jlong objHandle) {
293        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
294        return static_cast<jint>(obj->getTextAlign());
295    }
296
297    static void setTextAlign(JNIEnv* env, jobject clazz, jlong objHandle, jint alignHandle) {
298        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
299        SkPaint::Align align = static_cast<SkPaint::Align>(alignHandle);
300        obj->setTextAlign(align);
301    }
302
303    // generate bcp47 identifier for the supplied locale
304    static void toLanguageTag(char* output, size_t outSize,
305            const char* locale) {
306        if (output == NULL || outSize <= 0) {
307            return;
308        }
309        if (locale == NULL) {
310            output[0] = '\0';
311            return;
312        }
313        char canonicalChars[ULOC_FULLNAME_CAPACITY];
314        UErrorCode uErr = U_ZERO_ERROR;
315        uloc_canonicalize(locale, canonicalChars, ULOC_FULLNAME_CAPACITY,
316                &uErr);
317        if (U_SUCCESS(uErr)) {
318            char likelyChars[ULOC_FULLNAME_CAPACITY];
319            uErr = U_ZERO_ERROR;
320            uloc_addLikelySubtags(canonicalChars, likelyChars,
321                    ULOC_FULLNAME_CAPACITY, &uErr);
322            if (U_SUCCESS(uErr)) {
323                uErr = U_ZERO_ERROR;
324                uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
325                if (U_SUCCESS(uErr)) {
326                    return;
327                } else {
328                    ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,
329                            u_errorName(uErr));
330                }
331            } else {
332                ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s",
333                        canonicalChars, u_errorName(uErr));
334            }
335        } else {
336            ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale,
337                    u_errorName(uErr));
338        }
339        // unable to build a proper language identifier
340        output[0] = '\0';
341    }
342
343    static void setTextLocale(JNIEnv* env, jobject clazz, jlong objHandle, jstring locale) {
344        SkPaint* obj = reinterpret_cast<SkPaint*>(objHandle);
345        ScopedUtfChars localeChars(env, locale);
346        char langTag[ULOC_FULLNAME_CAPACITY];
347        toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeChars.c_str());
348
349        SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
350        paintOpts.setLanguage(langTag);
351        obj->setPaintOptionsAndroid(paintOpts);
352    }
353
354    static jfloat getTextSize(JNIEnv* env, jobject paint) {
355        NPE_CHECK_RETURN_ZERO(env, paint);
356        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
357    }
358
359    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
360        NPE_CHECK_RETURN_VOID(env, paint);
361        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
362    }
363
364    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
365        NPE_CHECK_RETURN_ZERO(env, paint);
366        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
367    }
368
369    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
370        NPE_CHECK_RETURN_VOID(env, paint);
371        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
372    }
373
374    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
375        NPE_CHECK_RETURN_ZERO(env, paint);
376        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
377    }
378
379    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
380        NPE_CHECK_RETURN_VOID(env, paint);
381        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
382    }
383
384    static jfloat ascent(JNIEnv* env, jobject paint) {
385        NPE_CHECK_RETURN_ZERO(env, paint);
386        SkPaint::FontMetrics    metrics;
387        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
388        return SkScalarToFloat(metrics.fAscent);
389    }
390
391    static jfloat descent(JNIEnv* env, jobject paint) {
392        NPE_CHECK_RETURN_ZERO(env, paint);
393        SkPaint::FontMetrics    metrics;
394        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
395        return SkScalarToFloat(metrics.fDescent);
396    }
397
398    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
399        NPE_CHECK_RETURN_ZERO(env, paint);
400        SkPaint::FontMetrics metrics;
401        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
402
403        if (metricsObj) {
404            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
405            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
406            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
407            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
408            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
409            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
410        }
411        return SkScalarToFloat(spacing);
412    }
413
414    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
415        NPE_CHECK_RETURN_ZERO(env, paint);
416        SkPaint::FontMetrics metrics;
417
418        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
419        int ascent = SkScalarRound(metrics.fAscent);
420        int descent = SkScalarRound(metrics.fDescent);
421        int leading = SkScalarRound(metrics.fLeading);
422
423        if (metricsObj) {
424            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
425            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
426            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
427            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
428            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
429            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
430        }
431        return descent - ascent + leading;
432    }
433
434    static jfloat measureText_CIII(JNIEnv* env, jobject jpaint, jcharArray text, jint index, jint count,
435            jint bidiFlags) {
436        NPE_CHECK_RETURN_ZERO(env, jpaint);
437        NPE_CHECK_RETURN_ZERO(env, text);
438
439        size_t textLength = env->GetArrayLength(text);
440        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
441            doThrowAIOOBE(env);
442            return 0;
443        }
444        if (count == 0) {
445            return 0;
446        }
447
448        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
449        const jchar* textArray = env->GetCharArrayElements(text, NULL);
450        jfloat result = 0;
451
452        TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
453                bidiFlags, NULL /* dont need all advances */, &result);
454
455        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
456        return result;
457    }
458
459    static jfloat measureText_StringIII(JNIEnv* env, jobject jpaint, jstring text, jint start, jint end,
460            jint bidiFlags) {
461        NPE_CHECK_RETURN_ZERO(env, jpaint);
462        NPE_CHECK_RETURN_ZERO(env, text);
463
464        size_t textLength = env->GetStringLength(text);
465        int count = end - start;
466        if ((start | count) < 0 || (size_t)end > textLength) {
467            doThrowAIOOBE(env);
468            return 0;
469        }
470        if (count == 0) {
471            return 0;
472        }
473
474        const jchar* textArray = env->GetStringChars(text, NULL);
475        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
476        jfloat width = 0;
477
478        TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
479                bidiFlags, NULL /* dont need all advances */, &width);
480
481        env->ReleaseStringChars(text, textArray);
482        return width;
483    }
484
485    static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
486        NPE_CHECK_RETURN_ZERO(env, jpaint);
487        NPE_CHECK_RETURN_ZERO(env, text);
488
489        size_t textLength = env->GetStringLength(text);
490        if (textLength == 0) {
491            return 0;
492        }
493
494        const jchar* textArray = env->GetStringChars(text, NULL);
495        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
496        jfloat width = 0;
497
498        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
499                bidiFlags, NULL /* dont need all advances */, &width);
500
501        env->ReleaseStringChars(text, textArray);
502        return width;
503    }
504
505    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths,
506            jint bidiFlags) {
507        NPE_CHECK_RETURN_ZERO(env, paint);
508        NPE_CHECK_RETURN_ZERO(env, text);
509
510        if (count < 0 || !widths) {
511            doThrowAIOOBE(env);
512            return 0;
513        }
514        if (count == 0) {
515            return 0;
516        }
517        size_t widthsLength = env->GetArrayLength(widths);
518        if ((size_t)count > widthsLength) {
519            doThrowAIOOBE(env);
520            return 0;
521        }
522
523        AutoJavaFloatArray autoWidths(env, widths, count);
524        jfloat* widthsArray = autoWidths.ptr();
525
526        TextLayout::getTextRunAdvances(paint, text, 0, count, count,
527                bidiFlags, widthsArray, NULL /* dont need totalAdvance */);
528
529        return count;
530    }
531
532    static jint getTextWidths___CIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
533            jint index, jint count, jint bidiFlags, jfloatArray widths) {
534        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
535        const jchar* textArray = env->GetCharArrayElements(text, NULL);
536        count = dotextwidths(env, paint, textArray + index, count, widths, bidiFlags);
537        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
538                                      JNI_ABORT);
539        return count;
540    }
541
542    static jint getTextWidths__StringIII_F(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
543            jint start, jint end, jint bidiFlags, jfloatArray widths) {
544        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
545        const jchar* textArray = env->GetStringChars(text, NULL);
546        int count = dotextwidths(env, paint, textArray + start, end - start, widths, bidiFlags);
547        env->ReleaseStringChars(text, textArray);
548        return count;
549    }
550
551    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
552            jint contextCount, jint flags, jcharArray glyphs) {
553        NPE_CHECK_RETURN_ZERO(env, paint);
554        NPE_CHECK_RETURN_ZERO(env, text);
555
556        if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
557            doThrowAIOOBE(env);
558            return 0;
559        }
560        if (count == 0) {
561            return 0;
562        }
563        size_t glypthsLength = env->GetArrayLength(glyphs);
564        if ((size_t)count > glypthsLength) {
565            doThrowAIOOBE(env);
566            return 0;
567        }
568
569        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
570
571        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
572                text, start, count, contextCount, flags);
573        const jchar* shapedGlyphs = value->getGlyphs();
574        size_t glyphsCount = value->getGlyphsCount();
575        memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
576
577        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
578        return glyphsCount;
579    }
580
581    static jint getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, jlong paintHandle,
582            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
583            jcharArray glyphs) {
584        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
585        const jchar* textArray = env->GetStringChars(text, NULL);
586        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
587                end - start, contextEnd - contextStart, flags, glyphs);
588        env->ReleaseStringChars(text, textArray);
589        return count;
590    }
591
592    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
593                                    jint start, jint count, jint contextCount, jint flags,
594                                    jfloatArray advances, jint advancesIndex) {
595        NPE_CHECK_RETURN_ZERO(env, paint);
596        NPE_CHECK_RETURN_ZERO(env, text);
597
598        if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
599            doThrowAIOOBE(env);
600            return 0;
601        }
602        if (count == 0) {
603            return 0;
604        }
605        if (advances) {
606            size_t advancesLength = env->GetArrayLength(advances);
607            if ((size_t)count > advancesLength) {
608                doThrowAIOOBE(env);
609                return 0;
610            }
611        }
612        jfloat advancesArray[count];
613        jfloat totalAdvance = 0;
614
615        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
616                                       advancesArray, &totalAdvance);
617
618        if (advances != NULL) {
619            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
620        }
621        return totalAdvance;
622    }
623
624    static jfloat getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
625            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
626            jint flags, jfloatArray advances, jint advancesIndex) {
627        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
628        jchar* textArray = env->GetCharArrayElements(text, NULL);
629        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
630                index - contextIndex, count, contextCount, flags, advances, advancesIndex);
631        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
632        return result;
633    }
634
635    static jfloat getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, jlong paintHandle,
636            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
637            jfloatArray advances, jint advancesIndex) {
638        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
639        const jchar* textArray = env->GetStringChars(text, NULL);
640        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
641                start - contextStart, end - start, contextEnd - contextStart, flags,
642                advances, advancesIndex);
643        env->ReleaseStringChars(text, textArray);
644        return result;
645    }
646
647    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
648            jint count, jint flags, jint offset, jint opt) {
649        jfloat scalarArray[count];
650
651        TextLayout::getTextRunAdvances(paint, text, start, count, start + count, flags,
652                scalarArray, NULL /* dont need totalAdvance */);
653
654        jint pos = offset - start;
655        switch (opt) {
656        case AFTER:
657          if (pos < count) {
658            pos += 1;
659          }
660          // fall through
661        case AT_OR_AFTER:
662          while (pos < count && scalarArray[pos] == 0) {
663            ++pos;
664          }
665          break;
666        case BEFORE:
667          if (pos > 0) {
668            --pos;
669          }
670          // fall through
671        case AT_OR_BEFORE:
672          while (pos > 0 && scalarArray[pos] == 0) {
673            --pos;
674          }
675          break;
676        case AT:
677        default:
678          if (scalarArray[pos] == 0) {
679            pos = -1;
680          }
681          break;
682        }
683
684        if (pos != -1) {
685          pos += start;
686        }
687
688        return pos;
689    }
690
691    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, jlong paintHandle, jcharArray text,
692            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
693        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
694        jchar* textArray = env->GetCharArrayElements(text, NULL);
695        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
696                offset, cursorOpt);
697        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
698        return result;
699    }
700
701    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, jlong paintHandle, jstring text,
702            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
703        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
704        const jchar* textArray = env->GetStringChars(text, NULL);
705        jint result = doTextRunCursor(env, paint, textArray, contextStart,
706                contextEnd - contextStart, flags, offset, cursorOpt);
707        env->ReleaseStringChars(text, textArray);
708        return result;
709    }
710
711    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
712                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
713        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
714    }
715
716    static void getTextPath___C(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
717            jcharArray text, jint index, jint count, jfloat x, jfloat y, jlong pathHandle) {
718        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
719        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
720        const jchar* textArray = env->GetCharArrayElements(text, NULL);
721        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
722        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
723    }
724
725    static void getTextPath__String(JNIEnv* env, jobject clazz, jlong paintHandle, jint bidiFlags,
726            jstring text, jint start, jint end, jfloat x, jfloat y, jlong pathHandle) {
727        SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
728        SkPath* path = reinterpret_cast<SkPath*>(pathHandle);
729        const jchar* textArray = env->GetStringChars(text, NULL);
730        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
731        env->ReleaseStringChars(text, textArray);
732    }
733
734    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
735                               jfloat dx, jfloat dy, jint color) {
736        NPE_CHECK_RETURN_VOID(env, jpaint);
737
738        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
739        if (radius <= 0) {
740            paint->setLooper(NULL);
741        }
742        else {
743            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
744                                                  SkFloatToScalar(dx),
745                                                  SkFloatToScalar(dy),
746                                                  (SkColor)color))->unref();
747        }
748    }
749
750    static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
751                         int count, float maxWidth, jint bidiFlags, jfloatArray jmeasured,
752                         SkPaint::TextBufferDirection tbd) {
753        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
754                text, 0, count, count, bidiFlags);
755        if (value == NULL) {
756            return 0;
757        }
758        SkScalar     measured;
759        size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
760                                   SkFloatToScalar(maxWidth), &measured, tbd);
761        SkASSERT((bytes & 1) == 0);
762
763        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
764            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
765            jfloat* array = autoMeasured.ptr();
766            array[0] = SkScalarToFloat(measured);
767        }
768        return bytes >> 1;
769    }
770
771    static jint breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
772            jint index, jint count, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
773        NPE_CHECK_RETURN_ZERO(env, jpaint);
774        NPE_CHECK_RETURN_ZERO(env, jtext);
775
776        SkPaint::TextBufferDirection tbd;
777        if (count < 0) {
778            tbd = SkPaint::kBackward_TextBufferDirection;
779            count = -count;
780        }
781        else {
782            tbd = SkPaint::kForward_TextBufferDirection;
783        }
784
785        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
786            doThrowAIOOBE(env);
787            return 0;
788        }
789
790        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
791        const jchar* text = env->GetCharArrayElements(jtext, NULL);
792        count = breakText(env, *paint, text + index, count, maxWidth,
793                          bidiFlags, jmeasuredWidth, tbd);
794        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
795                                      JNI_ABORT);
796        return count;
797    }
798
799    static jint breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
800                jboolean forwards, jfloat maxWidth, jint bidiFlags, jfloatArray jmeasuredWidth) {
801        NPE_CHECK_RETURN_ZERO(env, jpaint);
802        NPE_CHECK_RETURN_ZERO(env, jtext);
803
804        SkPaint::TextBufferDirection tbd = forwards ?
805                                        SkPaint::kForward_TextBufferDirection :
806                                        SkPaint::kBackward_TextBufferDirection;
807
808        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
809        int count = env->GetStringLength(jtext);
810        const jchar* text = env->GetStringChars(jtext, NULL);
811        count = breakText(env, *paint, text, count, maxWidth, bidiFlags, jmeasuredWidth, tbd);
812        env->ReleaseStringChars(jtext, text);
813        return count;
814    }
815
816    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
817                             jobject bounds, const SkPaint& paint, jint bidiFlags) {
818        SkRect  r;
819        SkIRect ir;
820
821        sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
822                text, 0, count, count, bidiFlags);
823        if (value == NULL) {
824            return;
825        }
826        paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
827        r.roundOut(&ir);
828        GraphicsJNI::irect_to_jrect(ir, env, bounds);
829    }
830
831    static void getStringBounds(JNIEnv* env, jobject, jlong paintHandle,
832                                jstring text, jint start, jint end, jint bidiFlags, jobject bounds) {
833        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);;
834        const jchar* textArray = env->GetStringChars(text, NULL);
835        doTextBounds(env, textArray + start, end - start, bounds, *paint, bidiFlags);
836        env->ReleaseStringChars(text, textArray);
837    }
838
839    static void getCharArrayBounds(JNIEnv* env, jobject, jlong paintHandle,
840                        jcharArray text, jint index, jint count, jint bidiFlags, jobject bounds) {
841        const SkPaint* paint = reinterpret_cast<SkPaint*>(paintHandle);
842        const jchar* textArray = env->GetCharArrayElements(text, NULL);
843        doTextBounds(env, textArray + index, count, bounds, *paint, bidiFlags);
844        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
845                                      JNI_ABORT);
846    }
847
848};
849
850static JNINativeMethod methods[] = {
851    {"finalizer", "(J)V", (void*) SkPaintGlue::finalizer},
852    {"native_init","()J", (void*) SkPaintGlue::init},
853    {"native_initWithPaint","(J)J", (void*) SkPaintGlue::initWithPaint},
854    {"native_reset","(J)V", (void*) SkPaintGlue::reset},
855    {"native_set","(JJ)V", (void*) SkPaintGlue::assign},
856    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
857    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
858    {"getHinting","()I", (void*) SkPaintGlue::getHinting},
859    {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
860    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
861    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
862    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
863    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
864    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
865    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
866    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
867    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
868    {"native_getStyle","(J)I", (void*) SkPaintGlue::getStyle},
869    {"native_setStyle","(JI)V", (void*) SkPaintGlue::setStyle},
870    {"getColor","()I", (void*) SkPaintGlue::getColor},
871    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
872    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
873    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
874    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
875    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
876    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
877    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
878    {"native_getStrokeCap","(J)I", (void*) SkPaintGlue::getStrokeCap},
879    {"native_setStrokeCap","(JI)V", (void*) SkPaintGlue::setStrokeCap},
880    {"native_getStrokeJoin","(J)I", (void*) SkPaintGlue::getStrokeJoin},
881    {"native_setStrokeJoin","(JI)V", (void*) SkPaintGlue::setStrokeJoin},
882    {"native_getFillPath","(JJJ)Z", (void*) SkPaintGlue::getFillPath},
883    {"native_setShader","(JJ)J", (void*) SkPaintGlue::setShader},
884    {"native_setColorFilter","(JJ)J", (void*) SkPaintGlue::setColorFilter},
885    {"native_setXfermode","(JJ)J", (void*) SkPaintGlue::setXfermode},
886    {"native_setPathEffect","(JJ)J", (void*) SkPaintGlue::setPathEffect},
887    {"native_setMaskFilter","(JJ)J", (void*) SkPaintGlue::setMaskFilter},
888    {"native_setTypeface","(JJ)J", (void*) SkPaintGlue::setTypeface},
889    {"native_setRasterizer","(JJ)J", (void*) SkPaintGlue::setRasterizer},
890    {"native_getTextAlign","(J)I", (void*) SkPaintGlue::getTextAlign},
891    {"native_setTextAlign","(JI)V", (void*) SkPaintGlue::setTextAlign},
892    {"native_setTextLocale","(JLjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
893    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
894    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
895    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
896    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
897    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
898    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
899    {"ascent","()F", (void*) SkPaintGlue::ascent},
900    {"descent","()F", (void*) SkPaintGlue::descent},
901    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
902    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
903    {"native_measureText","([CIII)F", (void*) SkPaintGlue::measureText_CIII},
904    {"native_measureText","(Ljava/lang/String;I)F", (void*) SkPaintGlue::measureText_StringI},
905    {"native_measureText","(Ljava/lang/String;III)F", (void*) SkPaintGlue::measureText_StringIII},
906    {"native_breakText","([CIIFI[F)I", (void*) SkPaintGlue::breakTextC},
907    {"native_breakText","(Ljava/lang/String;ZFI[F)I", (void*) SkPaintGlue::breakTextS},
908    {"native_getTextWidths","(J[CIII[F)I", (void*) SkPaintGlue::getTextWidths___CIII_F},
909    {"native_getTextWidths","(JLjava/lang/String;III[F)I", (void*) SkPaintGlue::getTextWidths__StringIII_F},
910    {"native_getTextRunAdvances","(J[CIIIII[FI)F",
911        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
912    {"native_getTextRunAdvances","(JLjava/lang/String;IIIII[FI)F",
913        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
914
915
916    {"native_getTextGlyphs","(JLjava/lang/String;IIIII[C)I",
917        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
918    {"native_getTextRunCursor", "(J[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
919    {"native_getTextRunCursor", "(JLjava/lang/String;IIIII)I",
920        (void*) SkPaintGlue::getTextRunCursor__String},
921    {"native_getTextPath","(JI[CIIFFJ)V", (void*) SkPaintGlue::getTextPath___C},
922    {"native_getTextPath","(JILjava/lang/String;IIFFJ)V", (void*) SkPaintGlue::getTextPath__String},
923    {"nativeGetStringBounds", "(JLjava/lang/String;IIILandroid/graphics/Rect;)V",
924                                        (void*) SkPaintGlue::getStringBounds },
925    {"nativeGetCharArrayBounds", "(J[CIIILandroid/graphics/Rect;)V",
926                                    (void*) SkPaintGlue::getCharArrayBounds },
927    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
928};
929
930static jfieldID req_fieldID(jfieldID id) {
931    SkASSERT(id);
932    return id;
933}
934
935int register_android_graphics_Paint(JNIEnv* env) {
936    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
937    SkASSERT(gFontMetrics_class);
938    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
939
940    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
941    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
942    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
943    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
944    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
945
946    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
947    SkASSERT(gFontMetricsInt_class);
948    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
949
950    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
951    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
952    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
953    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
954    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
955
956    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
957        sizeof(methods) / sizeof(methods[0]));
958    return result;
959}
960
961}
962