Paint.cpp revision 27f0b17d853d8bef918c3d869044e50cf3904ee3 
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#include "jni.h"
19#include "GraphicsJNI.h"
20#include <android_runtime/AndroidRuntime.h>
21
22#include "SkBlurDrawLooper.h"
23#include "SkColorFilter.h"
24#include "SkMaskFilter.h"
25#include "SkRasterizer.h"
26#include "SkShader.h"
27#include "SkTypeface.h"
28#include "SkXfermode.h"
29#include "unicode/ushape.h"
30#include "TextLayout.h"
31
32// temporary for debugging
33#include <Caches.h>
34#include <utils/Log.h>
35
36namespace android {
37
38struct JMetricsID {
39    jfieldID    top;
40    jfieldID    ascent;
41    jfieldID    descent;
42    jfieldID    bottom;
43    jfieldID    leading;
44};
45
46static jclass   gFontMetrics_class;
47static JMetricsID gFontMetrics_fieldID;
48
49static jclass   gFontMetricsInt_class;
50static JMetricsID gFontMetricsInt_fieldID;
51
52static void defaultSettingsForAndroid(SkPaint* paint) {
53    // looks best we decided
54    paint->setHinting(SkPaint::kSlight_Hinting);
55    // utf16 is required for java
56    paint->setTextEncoding(SkPaint::kUTF16_TextEncoding);
57}
58
59class SkPaintGlue {
60public:
61    enum MoveOpt {
62        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
63    };
64
65    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
66#ifdef USE_OPENGL_RENDERER
67        if (android::uirenderer::Caches::hasInstance()) {
68            android::uirenderer::Caches::getInstance().resourceCache.destructor(obj);
69            return;
70        }
71#endif // USE_OPENGL_RENDERER
72        delete obj;
73    }
74
75    static SkPaint* init(JNIEnv* env, jobject clazz) {
76        SkPaint* obj = new SkPaint();
77        defaultSettingsForAndroid(obj);
78        return obj;
79    }
80
81    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
82        SkPaint* obj = new SkPaint(*paint);
83        return obj;
84    }
85
86    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
87        obj->reset();
88        defaultSettingsForAndroid(obj);
89    }
90
91    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
92        *dst = *src;
93    }
94
95    static jint getFlags(JNIEnv* env, jobject paint) {
96        NPE_CHECK_RETURN_ZERO(env, paint);
97        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
98    }
99
100    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
101        NPE_CHECK_RETURN_VOID(env, paint);
102        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
103    }
104
105    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
106        NPE_CHECK_RETURN_VOID(env, paint);
107        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
108    }
109
110    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
111        NPE_CHECK_RETURN_VOID(env, paint);
112        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
113    }
114
115    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
116        NPE_CHECK_RETURN_VOID(env, paint);
117        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
118    }
119
120    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
121        NPE_CHECK_RETURN_VOID(env, paint);
122        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
123    }
124
125    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
126        NPE_CHECK_RETURN_VOID(env, paint);
127        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
128    }
129
130    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
131        NPE_CHECK_RETURN_VOID(env, paint);
132        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
133    }
134
135    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
136        NPE_CHECK_RETURN_VOID(env, paint);
137        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
138    }
139
140    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
141        NPE_CHECK_RETURN_VOID(env, paint);
142        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
143    }
144
145    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
146        return obj->getStyle();
147    }
148
149    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
150        obj->setStyle(style);
151    }
152
153    static jint getColor(JNIEnv* env, jobject paint) {
154        NPE_CHECK_RETURN_ZERO(env, paint);
155        return GraphicsJNI::getNativePaint(env, paint)->getColor();
156    }
157
158    static jint getAlpha(JNIEnv* env, jobject paint) {
159        NPE_CHECK_RETURN_ZERO(env, paint);
160        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
161    }
162
163    static void setColor(JNIEnv* env, jobject paint, jint color) {
164        NPE_CHECK_RETURN_VOID(env, paint);
165        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
166    }
167
168    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
169        NPE_CHECK_RETURN_VOID(env, paint);
170        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
171    }
172
173    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
174        NPE_CHECK_RETURN_ZERO(env, paint);
175        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
176    }
177
178    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
179        NPE_CHECK_RETURN_VOID(env, paint);
180        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
181    }
182
183    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
184        NPE_CHECK_RETURN_ZERO(env, paint);
185        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
186    }
187
188    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
189        NPE_CHECK_RETURN_VOID(env, paint);
190        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
191    }
192
193    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
194        return obj->getStrokeCap();
195    }
196
197    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
198        obj->setStrokeCap(cap);
199    }
200
201    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
202        return obj->getStrokeJoin();
203    }
204
205    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
206        obj->setStrokeJoin(join);
207    }
208
209    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
210        return obj->getFillPath(*src, dst);
211    }
212
213    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
214        return obj->setShader(shader);
215    }
216
217    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
218        return obj->setColorFilter(filter);
219    }
220
221    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
222        return obj->setXfermode(xfermode);
223    }
224
225    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
226        return obj->setPathEffect(effect);
227    }
228
229    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
230        return obj->setMaskFilter(maskfilter);
231    }
232
233    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
234        return obj->setTypeface(typeface);
235    }
236
237    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
238        return obj->setRasterizer(rasterizer);
239    }
240
241    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
242        return obj->getTextAlign();
243    }
244
245    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
246        obj->setTextAlign(align);
247    }
248
249    static jfloat getTextSize(JNIEnv* env, jobject paint) {
250        NPE_CHECK_RETURN_ZERO(env, paint);
251        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
252    }
253
254    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
255        NPE_CHECK_RETURN_VOID(env, paint);
256        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
257    }
258
259    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
260        NPE_CHECK_RETURN_ZERO(env, paint);
261        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
262    }
263
264    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
265        NPE_CHECK_RETURN_VOID(env, paint);
266        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
267    }
268
269    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
270        NPE_CHECK_RETURN_ZERO(env, paint);
271        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
272    }
273
274    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
275        NPE_CHECK_RETURN_VOID(env, paint);
276        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
277    }
278
279    static jfloat ascent(JNIEnv* env, jobject paint) {
280        NPE_CHECK_RETURN_ZERO(env, paint);
281        SkPaint::FontMetrics    metrics;
282        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
283        return SkScalarToFloat(metrics.fAscent);
284    }
285
286    static jfloat descent(JNIEnv* env, jobject paint) {
287        NPE_CHECK_RETURN_ZERO(env, paint);
288        SkPaint::FontMetrics    metrics;
289        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
290        return SkScalarToFloat(metrics.fDescent);
291    }
292
293    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
294        NPE_CHECK_RETURN_ZERO(env, paint);
295        SkPaint::FontMetrics metrics;
296        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
297
298        if (metricsObj) {
299            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
300            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
301            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
302            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
303            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
304            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
305        }
306        return SkScalarToFloat(spacing);
307    }
308
309    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
310        NPE_CHECK_RETURN_ZERO(env, paint);
311        SkPaint::FontMetrics metrics;
312
313        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
314        int ascent = SkScalarRound(metrics.fAscent);
315        int descent = SkScalarRound(metrics.fDescent);
316        int leading = SkScalarRound(metrics.fLeading);
317
318        if (metricsObj) {
319            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
320            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
321            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
322            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
323            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
324            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
325        }
326        return descent - ascent + leading;
327    }
328
329    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
330        NPE_CHECK_RETURN_ZERO(env, jpaint);
331        NPE_CHECK_RETURN_ZERO(env, text);
332
333        size_t textLength = env->GetArrayLength(text);
334
335        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
336            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
337            return 0;
338        }
339
340        const SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
341        const jchar* textArray = env->GetCharArrayElements(text, NULL);
342        // we double count, since measureText wants a byteLength
343        SkScalar width = paint->measureText(textArray + index, count << 1);
344        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
345                                      JNI_ABORT);
346
347        return SkScalarToFloat(width);
348    }
349
350    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
351        NPE_CHECK_RETURN_ZERO(env, jpaint);
352        NPE_CHECK_RETURN_ZERO(env, text);
353
354        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
355        const jchar* textArray = env->GetStringChars(text, NULL);
356        size_t textLength = env->GetStringLength(text);
357
358        int count = end - start;
359        if ((start | count) < 0 || (size_t)count > textLength) {
360            doThrow(env, "java/lang/IndexOutOfBoundsException");
361            return 0;
362        }
363
364        jfloat width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
365        env->ReleaseStringChars(text, textArray);
366        return width;
367    }
368
369    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
370        NPE_CHECK_RETURN_ZERO(env, jpaint);
371        NPE_CHECK_RETURN_ZERO(env, text);
372
373        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
374        const jchar* textArray = env->GetStringChars(text, NULL);
375        size_t textLength = env->GetStringLength(text);
376
377        jfloat width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
378        env->ReleaseStringChars(text, textArray);
379        return width;
380    }
381
382    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
383        AutoJavaFloatArray autoWidths(env, widths, count);
384        jfloat* widthsArray = autoWidths.ptr();
385        SkScalar* scalarArray = (SkScalar*)widthsArray;
386
387        count = paint->getTextWidths(text, count << 1, scalarArray);
388        for (int i = 0; i < count; i++) {
389            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
390        }
391        return count;
392    }
393
394    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
395        const jchar* textArray = env->GetCharArrayElements(text, NULL);
396        count = dotextwidths(env, paint, textArray + index, count, widths);
397        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
398                                      JNI_ABORT);
399        return count;
400    }
401
402    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, int start, int end, jfloatArray widths) {
403        const jchar* textArray = env->GetStringChars(text, NULL);
404        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
405        env->ReleaseStringChars(text, textArray);
406        return count;
407    }
408
409    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
410                                    jint start, jint count, jint contextCount, jint flags,
411                                    jfloatArray advances, jint advancesIndex) {
412        jfloat advancesArray[count];
413        jfloat totalAdvance;
414
415        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
416                                       advancesArray, totalAdvance);
417
418        if (advances != NULL) {
419            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
420        }
421        return totalAdvance;
422    }
423
424    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
425            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
426            jint flags, jfloatArray advances, jint advancesIndex) {
427        jchar* textArray = env->GetCharArrayElements(text, NULL);
428        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
429            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
430        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
431        return result;
432    }
433
434    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
435            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
436            jfloatArray advances, jint advancesIndex) {
437        const jchar* textArray = env->GetStringChars(text, NULL);
438        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
439            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
440            advancesIndex);
441        env->ReleaseStringChars(text, textArray);
442        return result;
443    }
444
445    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
446            jint count, jint flags, jint offset, jint opt) {
447        SkScalar scalarArray[count];
448        jchar buffer[count];
449
450        // this is where we'd call harfbuzz
451        // for now we just use ushape.c and widths returned from skia
452
453        int widths;
454        if (flags & 0x1) { // rtl, call arabic shaping in case
455            UErrorCode status = U_ZERO_ERROR;
456            // Use fixed length since we need to keep start and count valid
457            u_shapeArabic(text + start, count, buffer, count,
458                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
459                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
460            // we shouldn't fail unless there's an out of memory condition,
461            // in which case we're hosed anyway
462            for (int i = 0; i < count; ++i) {
463              if (buffer[i] == 0xffff) {
464                buffer[i] = 0x200b; // zero-width-space for skia
465              }
466            }
467            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
468        } else {
469            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
470        }
471
472        if (widths < count) {
473            // Skia operates on code points, not code units, so surrogate pairs return only one
474            // value. Expand the result so we have one value per UTF-16 code unit.
475
476            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
477            // leaving the remaining widths zero.  Not nice.
478            const jchar *chars = text + start;
479            for (int i = count, p = widths - 1; --i > p;) {
480                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
481                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
482                    scalarArray[i] = 0;
483                } else {
484                  scalarArray[i] = scalarArray[--p];
485                }
486            }
487        }
488
489        jint pos = offset - start;
490        switch (opt) {
491        case AFTER:
492          if (pos < count) {
493            pos += 1;
494          }
495          // fall through
496        case AT_OR_AFTER:
497          while (pos < count && scalarArray[pos] == 0) {
498            ++pos;
499          }
500          break;
501        case BEFORE:
502          if (pos > 0) {
503            --pos;
504          }
505          // fall through
506        case AT_OR_BEFORE:
507          while (pos > 0 && scalarArray[pos] == 0) {
508            --pos;
509          }
510          break;
511        case AT:
512        default:
513          if (scalarArray[pos] == 0) {
514            pos = -1;
515          }
516          break;
517        }
518
519        if (pos != -1) {
520          pos += start;
521        }
522
523        return pos;
524    }
525
526    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
527            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
528        jchar* textArray = env->GetCharArrayElements(text, NULL);
529        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
530                offset, cursorOpt);
531        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
532        return result;
533    }
534
535    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
536            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
537        const jchar* textArray = env->GetStringChars(text, NULL);
538        jint result = doTextRunCursor(env, paint, textArray, contextStart,
539                contextEnd - contextStart, flags, offset, cursorOpt);
540        env->ReleaseStringChars(text, textArray);
541        return result;
542    }
543
544    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
545                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
546        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
547    }
548
549    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
550            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
551        const jchar* textArray = env->GetCharArrayElements(text, NULL);
552        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
553        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
554    }
555
556    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
557            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
558        const jchar* textArray = env->GetStringChars(text, NULL);
559        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
560        env->ReleaseStringChars(text, textArray);
561    }
562
563    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
564                               jfloat dx, jfloat dy, int color) {
565        NPE_CHECK_RETURN_VOID(env, jpaint);
566
567        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
568        if (radius <= 0) {
569            paint->setLooper(NULL);
570        }
571        else {
572            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
573                                                  SkFloatToScalar(dx),
574                                                  SkFloatToScalar(dy),
575                                                  (SkColor)color))->unref();
576        }
577    }
578
579    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
580                         int count, float maxWidth, jfloatArray jmeasured,
581                         SkPaint::TextBufferDirection tbd) {
582        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
583
584        SkScalar     measured;
585        size_t       bytes = paint.breakText(text, count << 1,
586                                   SkFloatToScalar(maxWidth), &measured, tbd);
587        SkASSERT((bytes & 1) == 0);
588
589        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
590            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
591            jfloat* array = autoMeasured.ptr();
592            array[0] = SkScalarToFloat(measured);
593        }
594        return bytes >> 1;
595    }
596
597    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
598            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
599        NPE_CHECK_RETURN_ZERO(env, jpaint);
600        NPE_CHECK_RETURN_ZERO(env, jtext);
601
602        SkPaint::TextBufferDirection tbd;
603        if (count < 0) {
604            tbd = SkPaint::kBackward_TextBufferDirection;
605            count = -count;
606        }
607        else {
608            tbd = SkPaint::kForward_TextBufferDirection;
609        }
610
611        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
612            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
613            return 0;
614        }
615
616        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
617        const jchar* text = env->GetCharArrayElements(jtext, NULL);
618        count = breakText(env, *paint, text + index, count, maxWidth,
619                          jmeasuredWidth, tbd);
620        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
621                                      JNI_ABORT);
622        return count;
623    }
624
625    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
626                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
627        NPE_CHECK_RETURN_ZERO(env, jpaint);
628        NPE_CHECK_RETURN_ZERO(env, jtext);
629
630        SkPaint::TextBufferDirection tbd = forwards ?
631                                        SkPaint::kForward_TextBufferDirection :
632                                        SkPaint::kBackward_TextBufferDirection;
633
634        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
635        int count = env->GetStringLength(jtext);
636        const jchar* text = env->GetStringChars(jtext, NULL);
637        count = breakText(env, *paint, text, count, maxWidth,
638                          jmeasuredWidth, tbd);
639        env->ReleaseStringChars(jtext, text);
640        return count;
641    }
642
643    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
644                             jobject bounds, const SkPaint& paint)
645    {
646        SkRect  r;
647        SkIRect ir;
648
649        paint.measureText(text, count << 1, &r);
650        r.roundOut(&ir);
651        GraphicsJNI::irect_to_jrect(ir, env, bounds);
652    }
653
654    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
655                                jstring text, int start, int end, jobject bounds)
656    {
657        const jchar* textArray = env->GetStringChars(text, NULL);
658        doTextBounds(env, textArray + start, end - start, bounds, *paint);
659        env->ReleaseStringChars(text, textArray);
660    }
661
662    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
663                        jcharArray text, int index, int count, jobject bounds)
664    {
665        const jchar* textArray = env->GetCharArrayElements(text, NULL);
666        doTextBounds(env, textArray + index, count, bounds, *paint);
667        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
668                                      JNI_ABORT);
669    }
670
671};
672
673static JNINativeMethod methods[] = {
674    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
675    {"native_init","()I", (void*) SkPaintGlue::init},
676    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
677    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
678    {"native_set","(II)V", (void*) SkPaintGlue::assign},
679    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
680    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
681    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
682    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
683    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
684    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
685    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
686    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
687    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
688    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
689    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
690    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
691    {"getColor","()I", (void*) SkPaintGlue::getColor},
692    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
693    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
694    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
695    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
696    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
697    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
698    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
699    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
700    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
701    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
702    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
703    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
704    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
705    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
706    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
707    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
708    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
709    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
710    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
711    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
712    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
713    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
714    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
715    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
716    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
717    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
718    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
719    {"ascent","()F", (void*) SkPaintGlue::ascent},
720    {"descent","()F", (void*) SkPaintGlue::descent},
721    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
722    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
723    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
724    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
725    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
726    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
727    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
728    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
729    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
730    {"native_getTextRunAdvances","(I[CIIIII[FI)F", (void*)
731        SkPaintGlue::getTextRunAdvances___CIIIII_FI},
732    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
733        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
734    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
735    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
736        (void*) SkPaintGlue::getTextRunCursor__String},
737    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
738    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
739    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
740                                        (void*) SkPaintGlue::getStringBounds },
741    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
742                                    (void*) SkPaintGlue::getCharArrayBounds },
743    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
744};
745
746static jfieldID req_fieldID(jfieldID id) {
747    SkASSERT(id);
748    return id;
749}
750
751int register_android_graphics_Paint(JNIEnv* env) {
752    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
753    SkASSERT(gFontMetrics_class);
754    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
755
756    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
757    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
758    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
759    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
760    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
761
762    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
763    SkASSERT(gFontMetricsInt_class);
764    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
765
766    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
767    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
768    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
769    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
770    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
771
772    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
773        sizeof(methods) / sizeof(methods[0]));
774    return result;
775}
776
777}
778