Paint.cpp revision 0a1413e4bf9dcda2a8abb2287e43f612a7fb2453 
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        delete obj;
67    }
68
69    static SkPaint* init(JNIEnv* env, jobject clazz) {
70        SkPaint* obj = new SkPaint();
71        defaultSettingsForAndroid(obj);
72        return obj;
73    }
74
75    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
76        SkPaint* obj = new SkPaint(*paint);
77        return obj;
78    }
79
80    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
81        obj->reset();
82        defaultSettingsForAndroid(obj);
83    }
84
85    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
86        *dst = *src;
87    }
88
89    static jint getFlags(JNIEnv* env, jobject paint) {
90        NPE_CHECK_RETURN_ZERO(env, paint);
91        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
92    }
93
94    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
95        NPE_CHECK_RETURN_VOID(env, paint);
96        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
97    }
98
99    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
100        NPE_CHECK_RETURN_VOID(env, paint);
101        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
102    }
103
104    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
105        NPE_CHECK_RETURN_VOID(env, paint);
106        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
107    }
108
109    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
110        NPE_CHECK_RETURN_VOID(env, paint);
111        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
112    }
113
114    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
115        NPE_CHECK_RETURN_VOID(env, paint);
116        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
117    }
118
119    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
120        NPE_CHECK_RETURN_VOID(env, paint);
121        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
122    }
123
124    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
125        NPE_CHECK_RETURN_VOID(env, paint);
126        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
127    }
128
129    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
130        NPE_CHECK_RETURN_VOID(env, paint);
131        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
132    }
133
134    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
135        NPE_CHECK_RETURN_VOID(env, paint);
136        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
137    }
138
139    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
140        return obj->getStyle();
141    }
142
143    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
144        obj->setStyle(style);
145    }
146
147    static jint getColor(JNIEnv* env, jobject paint) {
148        NPE_CHECK_RETURN_ZERO(env, paint);
149        return GraphicsJNI::getNativePaint(env, paint)->getColor();
150    }
151
152    static jint getAlpha(JNIEnv* env, jobject paint) {
153        NPE_CHECK_RETURN_ZERO(env, paint);
154        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
155    }
156
157    static void setColor(JNIEnv* env, jobject paint, jint color) {
158        NPE_CHECK_RETURN_VOID(env, paint);
159        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
160    }
161
162    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
163        NPE_CHECK_RETURN_VOID(env, paint);
164        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
165    }
166
167    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
168        NPE_CHECK_RETURN_ZERO(env, paint);
169        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
170    }
171
172    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
173        NPE_CHECK_RETURN_VOID(env, paint);
174        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
175    }
176
177    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
178        NPE_CHECK_RETURN_ZERO(env, paint);
179        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
180    }
181
182    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
183        NPE_CHECK_RETURN_VOID(env, paint);
184        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
185    }
186
187    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
188        return obj->getStrokeCap();
189    }
190
191    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
192        obj->setStrokeCap(cap);
193    }
194
195    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
196        return obj->getStrokeJoin();
197    }
198
199    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
200        obj->setStrokeJoin(join);
201    }
202
203    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
204        return obj->getFillPath(*src, dst);
205    }
206
207    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
208        return obj->setShader(shader);
209    }
210
211    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
212        return obj->setColorFilter(filter);
213    }
214
215    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
216        return obj->setXfermode(xfermode);
217    }
218
219    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
220        return obj->setPathEffect(effect);
221    }
222
223    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
224        return obj->setMaskFilter(maskfilter);
225    }
226
227    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
228        return obj->setTypeface(typeface);
229    }
230
231    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
232        return obj->setRasterizer(rasterizer);
233    }
234
235    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
236        return obj->getTextAlign();
237    }
238
239    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
240        obj->setTextAlign(align);
241    }
242
243    static jfloat getTextSize(JNIEnv* env, jobject paint) {
244        NPE_CHECK_RETURN_ZERO(env, paint);
245        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
246    }
247
248    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
249        NPE_CHECK_RETURN_VOID(env, paint);
250        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
251    }
252
253    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
254        NPE_CHECK_RETURN_ZERO(env, paint);
255        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
256    }
257
258    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
259        NPE_CHECK_RETURN_VOID(env, paint);
260        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
261    }
262
263    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
264        NPE_CHECK_RETURN_ZERO(env, paint);
265        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
266    }
267
268    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
269        NPE_CHECK_RETURN_VOID(env, paint);
270        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
271    }
272
273    static jfloat ascent(JNIEnv* env, jobject paint) {
274        NPE_CHECK_RETURN_ZERO(env, paint);
275        SkPaint::FontMetrics    metrics;
276        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
277        return SkScalarToFloat(metrics.fAscent);
278    }
279
280    static jfloat descent(JNIEnv* env, jobject paint) {
281        NPE_CHECK_RETURN_ZERO(env, paint);
282        SkPaint::FontMetrics    metrics;
283        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
284        return SkScalarToFloat(metrics.fDescent);
285    }
286
287    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
288        NPE_CHECK_RETURN_ZERO(env, paint);
289        SkPaint::FontMetrics metrics;
290        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
291
292        if (metricsObj) {
293            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
294            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
295            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
296            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
297            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
298            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
299        }
300        return SkScalarToFloat(spacing);
301    }
302
303    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
304        NPE_CHECK_RETURN_ZERO(env, paint);
305        SkPaint::FontMetrics metrics;
306
307        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
308        int ascent = SkScalarRound(metrics.fAscent);
309        int descent = SkScalarRound(metrics.fDescent);
310        int leading = SkScalarRound(metrics.fLeading);
311
312        if (metricsObj) {
313            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
314            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
315            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
316            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
317            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
318            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
319        }
320        return descent - ascent + leading;
321    }
322
323    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
324        NPE_CHECK_RETURN_ZERO(env, jpaint);
325        NPE_CHECK_RETURN_ZERO(env, text);
326
327        size_t textLength = env->GetArrayLength(text);
328
329        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
330            doThrowAIOOBE(env);
331            return 0;
332        }
333
334        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
335        const jchar* textArray = env->GetCharArrayElements(text, NULL);
336        jfloat result = 0;
337#if RTL_USE_HARFBUZZ
338        TextLayout::getTextRunAdvances(paint, textArray, index, count, count, paint->getFlags(),
339                NULL /* dont need all advances */, result);
340#else
341        // we double count, since measureText wants a byteLength
342        SkScalar width = paint->measureText(textArray + index, count << 1);
343        result = SkScalarToFloat(width);
344#endif
345        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
346        return result;
347    }
348
349    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
350        NPE_CHECK_RETURN_ZERO(env, jpaint);
351        NPE_CHECK_RETURN_ZERO(env, text);
352
353        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
354        const jchar* textArray = env->GetStringChars(text, NULL);
355
356        int count = end - start;
357        size_t textLength = env->GetStringLength(text);
358        if ((start | count) < 0 || (size_t)count > textLength) {
359            doThrowAIOOBE(env);
360            return 0;
361        }
362        jfloat width = 0;
363
364#if RTL_USE_HARFBUZZ
365        TextLayout::getTextRunAdvances(paint, textArray, 0, count, count, paint->getFlags(),
366                NULL /* dont need all advances */, width);
367#else
368
369        width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
370#endif
371        env->ReleaseStringChars(text, textArray);
372        return width;
373    }
374
375    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
376        NPE_CHECK_RETURN_ZERO(env, jpaint);
377        NPE_CHECK_RETURN_ZERO(env, text);
378
379        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
380        const jchar* textArray = env->GetStringChars(text, NULL);
381        size_t textLength = env->GetStringLength(text);
382        jfloat width = 0;
383#if RTL_USE_HARFBUZZ
384        TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength, paint->getFlags(),
385                NULL /* dont need all advances */, width);
386#else
387        width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
388#endif
389        env->ReleaseStringChars(text, textArray);
390        return width;
391    }
392
393    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
394        AutoJavaFloatArray autoWidths(env, widths, count);
395        jfloat* widthsArray = autoWidths.ptr();
396#if RTL_USE_HARFBUZZ
397        jfloat totalAdvance;
398
399        TextLayout::getTextRunAdvances(paint, text, 0, count, count, paint->getFlags(),
400                widthsArray, totalAdvance);
401#else
402        SkScalar* scalarArray = (SkScalar*)widthsArray;
403
404        count = paint->getTextWidths(text, count << 1, scalarArray);
405        for (int i = 0; i < count; i++) {
406            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
407        }
408#endif
409        return count;
410    }
411
412    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
413        const jchar* textArray = env->GetCharArrayElements(text, NULL);
414        count = dotextwidths(env, paint, textArray + index, count, widths);
415        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
416                                      JNI_ABORT);
417        return count;
418    }
419
420    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
421            int start, int end, jfloatArray widths) {
422        const jchar* textArray = env->GetStringChars(text, NULL);
423        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
424        env->ReleaseStringChars(text, textArray);
425        return count;
426    }
427
428    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
429            jint contextCount, jint flags, jcharArray glyphs) {
430        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
431        HB_ShaperItem shaperItem;
432        HB_FontRec font;
433        FontData fontData;
434        TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text,
435                start, count, contextCount, flags);
436
437        int glyphCount = shaperItem.num_glyphs;
438        for (int i = 0; i < glyphCount; i++) {
439            glyphsArray[i] = (jchar) shaperItem.glyphs[i];
440        }
441        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
442        return glyphCount;
443    }
444
445    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
446            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
447            jcharArray glyphs) {
448        const jchar* textArray = env->GetStringChars(text, NULL);
449        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
450                end - start, contextEnd - contextStart, flags, glyphs);
451        env->ReleaseStringChars(text, textArray);
452        return count;
453    }
454
455    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
456                                    jint start, jint count, jint contextCount, jint flags,
457                                    jfloatArray advances, jint advancesIndex) {
458        jfloat advancesArray[count];
459        jfloat totalAdvance;
460
461        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
462                                       advancesArray, totalAdvance);
463
464        if (advances != NULL) {
465            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
466        }
467        return totalAdvance;
468    }
469
470    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
471                                    jint start, jint count, jint contextCount, jint flags,
472                                    jfloatArray advances, jint advancesIndex) {
473        jfloat advancesArray[count];
474        jfloat totalAdvance;
475
476        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
477                                       advancesArray, totalAdvance);
478
479        if (advances != NULL) {
480            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
481        }
482        return totalAdvance;
483    }
484
485    static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
486            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
487            jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
488        jchar* textArray = env->GetCharArrayElements(text, NULL);
489        jfloat result = (reserved == 0) ?
490                doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
491                        count, contextCount, flags, advances, advancesIndex) :
492                doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
493                        count, contextCount, flags, advances, advancesIndex);
494        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
495        return result;
496    }
497
498    static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
499            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
500            jfloatArray advances, jint advancesIndex, jint reserved) {
501        const jchar* textArray = env->GetStringChars(text, NULL);
502        jfloat result = (reserved == 0) ?
503                doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
504                        end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
505                doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
506                        end - start, contextEnd - contextStart, flags, advances, advancesIndex);
507        env->ReleaseStringChars(text, textArray);
508        return result;
509    }
510
511    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
512            jint count, jint flags, jint offset, jint opt) {
513#if RTL_USE_HARFBUZZ
514        jfloat scalarArray[count];
515        jfloat totalAdvance;
516
517        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
518                scalarArray, totalAdvance);
519#else
520        SkScalar scalarArray[count];
521        jchar buffer[count];
522
523        // this is where we'd call harfbuzz
524        // for now we just use ushape.c and widths returned from skia
525
526        int widths;
527        if (flags & 0x1) { // rtl, call arabic shaping in case
528            UErrorCode status = U_ZERO_ERROR;
529            // Use fixed length since we need to keep start and count valid
530            u_shapeArabic(text + start, count, buffer, count,
531                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
532                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
533            // we shouldn't fail unless there's an out of memory condition,
534            // in which case we're hosed anyway
535            for (int i = 0; i < count; ++i) {
536              if (buffer[i] == 0xffff) {
537                buffer[i] = 0x200b; // zero-width-space for skia
538              }
539            }
540            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
541        } else {
542            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
543        }
544
545        if (widths < count) {
546            // Skia operates on code points, not code units, so surrogate pairs return only one
547            // value. Expand the result so we have one value per UTF-16 code unit.
548
549            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
550            // leaving the remaining widths zero.  Not nice.
551            const jchar *chars = text + start;
552            for (int i = count, p = widths - 1; --i > p;) {
553                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
554                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
555                    scalarArray[i] = 0;
556                } else {
557                  scalarArray[i] = scalarArray[--p];
558                }
559            }
560        }
561#endif
562        jint pos = offset - start;
563        switch (opt) {
564        case AFTER:
565          if (pos < count) {
566            pos += 1;
567          }
568          // fall through
569        case AT_OR_AFTER:
570          while (pos < count && scalarArray[pos] == 0) {
571            ++pos;
572          }
573          break;
574        case BEFORE:
575          if (pos > 0) {
576            --pos;
577          }
578          // fall through
579        case AT_OR_BEFORE:
580          while (pos > 0 && scalarArray[pos] == 0) {
581            --pos;
582          }
583          break;
584        case AT:
585        default:
586          if (scalarArray[pos] == 0) {
587            pos = -1;
588          }
589          break;
590        }
591
592        if (pos != -1) {
593          pos += start;
594        }
595
596        return pos;
597    }
598
599    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
600            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
601        jchar* textArray = env->GetCharArrayElements(text, NULL);
602        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
603                offset, cursorOpt);
604        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
605        return result;
606    }
607
608    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
609            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
610        const jchar* textArray = env->GetStringChars(text, NULL);
611        jint result = doTextRunCursor(env, paint, textArray, contextStart,
612                contextEnd - contextStart, flags, offset, cursorOpt);
613        env->ReleaseStringChars(text, textArray);
614        return result;
615    }
616
617    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
618                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
619        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
620    }
621
622    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
623            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
624        const jchar* textArray = env->GetCharArrayElements(text, NULL);
625        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
626        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
627    }
628
629    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
630            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
631        const jchar* textArray = env->GetStringChars(text, NULL);
632        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
633        env->ReleaseStringChars(text, textArray);
634    }
635
636    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
637                               jfloat dx, jfloat dy, int color) {
638        NPE_CHECK_RETURN_VOID(env, jpaint);
639
640        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
641        if (radius <= 0) {
642            paint->setLooper(NULL);
643        }
644        else {
645            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
646                                                  SkFloatToScalar(dx),
647                                                  SkFloatToScalar(dy),
648                                                  (SkColor)color))->unref();
649        }
650    }
651
652    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
653                         int count, float maxWidth, jfloatArray jmeasured,
654                         SkPaint::TextBufferDirection tbd) {
655        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
656
657        SkScalar     measured;
658        size_t       bytes = paint.breakText(text, count << 1,
659                                   SkFloatToScalar(maxWidth), &measured, tbd);
660        SkASSERT((bytes & 1) == 0);
661
662        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
663            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
664            jfloat* array = autoMeasured.ptr();
665            array[0] = SkScalarToFloat(measured);
666        }
667        return bytes >> 1;
668    }
669
670    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
671            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
672        NPE_CHECK_RETURN_ZERO(env, jpaint);
673        NPE_CHECK_RETURN_ZERO(env, jtext);
674
675        SkPaint::TextBufferDirection tbd;
676        if (count < 0) {
677            tbd = SkPaint::kBackward_TextBufferDirection;
678            count = -count;
679        }
680        else {
681            tbd = SkPaint::kForward_TextBufferDirection;
682        }
683
684        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
685            doThrowAIOOBE(env);
686            return 0;
687        }
688
689        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
690        const jchar* text = env->GetCharArrayElements(jtext, NULL);
691        count = breakText(env, *paint, text + index, count, maxWidth,
692                          jmeasuredWidth, tbd);
693        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
694                                      JNI_ABORT);
695        return count;
696    }
697
698    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
699                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
700        NPE_CHECK_RETURN_ZERO(env, jpaint);
701        NPE_CHECK_RETURN_ZERO(env, jtext);
702
703        SkPaint::TextBufferDirection tbd = forwards ?
704                                        SkPaint::kForward_TextBufferDirection :
705                                        SkPaint::kBackward_TextBufferDirection;
706
707        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
708        int count = env->GetStringLength(jtext);
709        const jchar* text = env->GetStringChars(jtext, NULL);
710        count = breakText(env, *paint, text, count, maxWidth,
711                          jmeasuredWidth, tbd);
712        env->ReleaseStringChars(jtext, text);
713        return count;
714    }
715
716    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
717                             jobject bounds, const SkPaint& paint)
718    {
719        SkRect  r;
720        SkIRect ir;
721
722        paint.measureText(text, count << 1, &r);
723        r.roundOut(&ir);
724        GraphicsJNI::irect_to_jrect(ir, env, bounds);
725    }
726
727    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
728                                jstring text, int start, int end, jobject bounds)
729    {
730        const jchar* textArray = env->GetStringChars(text, NULL);
731        doTextBounds(env, textArray + start, end - start, bounds, *paint);
732        env->ReleaseStringChars(text, textArray);
733    }
734
735    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
736                        jcharArray text, int index, int count, jobject bounds)
737    {
738        const jchar* textArray = env->GetCharArrayElements(text, NULL);
739        doTextBounds(env, textArray + index, count, bounds, *paint);
740        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
741                                      JNI_ABORT);
742    }
743
744};
745
746static JNINativeMethod methods[] = {
747    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
748    {"native_init","()I", (void*) SkPaintGlue::init},
749    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
750    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
751    {"native_set","(II)V", (void*) SkPaintGlue::assign},
752    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
753    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
754    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
755    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
756    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
757    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
758    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
759    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
760    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
761    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
762    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
763    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
764    {"getColor","()I", (void*) SkPaintGlue::getColor},
765    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
766    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
767    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
768    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
769    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
770    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
771    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
772    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
773    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
774    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
775    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
776    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
777    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
778    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
779    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
780    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
781    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
782    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
783    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
784    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
785    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
786    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
787    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
788    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
789    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
790    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
791    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
792    {"ascent","()F", (void*) SkPaintGlue::ascent},
793    {"descent","()F", (void*) SkPaintGlue::descent},
794    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
795    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
796    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
797    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
798    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
799    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
800    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
801    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
802    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
803    {"native_getTextRunAdvances","(I[CIIIII[FII)F",
804        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
805    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
806        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
807
808
809    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
810        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
811    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
812    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
813        (void*) SkPaintGlue::getTextRunCursor__String},
814    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
815    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
816    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
817                                        (void*) SkPaintGlue::getStringBounds },
818    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
819                                    (void*) SkPaintGlue::getCharArrayBounds },
820    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
821};
822
823static jfieldID req_fieldID(jfieldID id) {
824    SkASSERT(id);
825    return id;
826}
827
828int register_android_graphics_Paint(JNIEnv* env) {
829    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
830    SkASSERT(gFontMetrics_class);
831    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
832
833    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
834    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
835    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
836    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
837    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
838
839    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
840    SkASSERT(gFontMetricsInt_class);
841    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
842
843    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
844    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
845    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
846    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
847    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
848
849    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
850        sizeof(methods) / sizeof(methods[0]));
851    return result;
852}
853
854}
855