Paint.cpp revision 4f810c8535055bd9a8d89a7d1ba0a7c712a8843d 
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_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
486            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
487            jint flags, jfloatArray advances, jint advancesIndex) {
488        jchar* textArray = env->GetCharArrayElements(text, NULL);
489        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
490            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
491        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
492        return result;
493    }
494
495    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
496            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
497            jfloatArray advances, jint advancesIndex) {
498        const jchar* textArray = env->GetStringChars(text, NULL);
499        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
500            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
501            advancesIndex);
502        env->ReleaseStringChars(text, textArray);
503        return result;
504    }
505
506    static float getTextRunAdvancesICU___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
507            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
508            jint flags, jfloatArray advances, jint advancesIndex) {
509        jchar* textArray = env->GetCharArrayElements(text, NULL);
510        jfloat result = doTextRunAdvancesICU(env, paint, textArray + contextIndex,
511            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
512        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
513        return result;
514    }
515
516    static float getTextRunAdvancesICU__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
517            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
518            jfloatArray advances, jint advancesIndex) {
519        const jchar* textArray = env->GetStringChars(text, NULL);
520        jfloat result = doTextRunAdvancesICU(env, paint, textArray + contextStart,
521            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
522            advancesIndex);
523        env->ReleaseStringChars(text, textArray);
524        return result;
525    }
526
527    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
528            jint count, jint flags, jint offset, jint opt) {
529#if RTL_USE_HARFBUZZ
530        jfloat scalarArray[count];
531        jfloat totalAdvance;
532
533        TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
534                scalarArray, totalAdvance);
535#else
536        SkScalar scalarArray[count];
537        jchar buffer[count];
538
539        // this is where we'd call harfbuzz
540        // for now we just use ushape.c and widths returned from skia
541
542        int widths;
543        if (flags & 0x1) { // rtl, call arabic shaping in case
544            UErrorCode status = U_ZERO_ERROR;
545            // Use fixed length since we need to keep start and count valid
546            u_shapeArabic(text + start, count, buffer, count,
547                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
548                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
549            // we shouldn't fail unless there's an out of memory condition,
550            // in which case we're hosed anyway
551            for (int i = 0; i < count; ++i) {
552              if (buffer[i] == 0xffff) {
553                buffer[i] = 0x200b; // zero-width-space for skia
554              }
555            }
556            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
557        } else {
558            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
559        }
560
561        if (widths < count) {
562            // Skia operates on code points, not code units, so surrogate pairs return only one
563            // value. Expand the result so we have one value per UTF-16 code unit.
564
565            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
566            // leaving the remaining widths zero.  Not nice.
567            const jchar *chars = text + start;
568            for (int i = count, p = widths - 1; --i > p;) {
569                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
570                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
571                    scalarArray[i] = 0;
572                } else {
573                  scalarArray[i] = scalarArray[--p];
574                }
575            }
576        }
577#endif
578        jint pos = offset - start;
579        switch (opt) {
580        case AFTER:
581          if (pos < count) {
582            pos += 1;
583          }
584          // fall through
585        case AT_OR_AFTER:
586          while (pos < count && scalarArray[pos] == 0) {
587            ++pos;
588          }
589          break;
590        case BEFORE:
591          if (pos > 0) {
592            --pos;
593          }
594          // fall through
595        case AT_OR_BEFORE:
596          while (pos > 0 && scalarArray[pos] == 0) {
597            --pos;
598          }
599          break;
600        case AT:
601        default:
602          if (scalarArray[pos] == 0) {
603            pos = -1;
604          }
605          break;
606        }
607
608        if (pos != -1) {
609          pos += start;
610        }
611
612        return pos;
613    }
614
615    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
616            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
617        jchar* textArray = env->GetCharArrayElements(text, NULL);
618        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
619                offset, cursorOpt);
620        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
621        return result;
622    }
623
624    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
625            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
626        const jchar* textArray = env->GetStringChars(text, NULL);
627        jint result = doTextRunCursor(env, paint, textArray, contextStart,
628                contextEnd - contextStart, flags, offset, cursorOpt);
629        env->ReleaseStringChars(text, textArray);
630        return result;
631    }
632
633    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
634                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
635        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
636    }
637
638    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
639            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
640        const jchar* textArray = env->GetCharArrayElements(text, NULL);
641        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
642        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
643    }
644
645    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
646            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
647        const jchar* textArray = env->GetStringChars(text, NULL);
648        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
649        env->ReleaseStringChars(text, textArray);
650    }
651
652    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
653                               jfloat dx, jfloat dy, int color) {
654        NPE_CHECK_RETURN_VOID(env, jpaint);
655
656        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
657        if (radius <= 0) {
658            paint->setLooper(NULL);
659        }
660        else {
661            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
662                                                  SkFloatToScalar(dx),
663                                                  SkFloatToScalar(dy),
664                                                  (SkColor)color))->unref();
665        }
666    }
667
668    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
669                         int count, float maxWidth, jfloatArray jmeasured,
670                         SkPaint::TextBufferDirection tbd) {
671        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
672
673        SkScalar     measured;
674        size_t       bytes = paint.breakText(text, count << 1,
675                                   SkFloatToScalar(maxWidth), &measured, tbd);
676        SkASSERT((bytes & 1) == 0);
677
678        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
679            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
680            jfloat* array = autoMeasured.ptr();
681            array[0] = SkScalarToFloat(measured);
682        }
683        return bytes >> 1;
684    }
685
686    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
687            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
688        NPE_CHECK_RETURN_ZERO(env, jpaint);
689        NPE_CHECK_RETURN_ZERO(env, jtext);
690
691        SkPaint::TextBufferDirection tbd;
692        if (count < 0) {
693            tbd = SkPaint::kBackward_TextBufferDirection;
694            count = -count;
695        }
696        else {
697            tbd = SkPaint::kForward_TextBufferDirection;
698        }
699
700        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
701            doThrowAIOOBE(env);
702            return 0;
703        }
704
705        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
706        const jchar* text = env->GetCharArrayElements(jtext, NULL);
707        count = breakText(env, *paint, text + index, count, maxWidth,
708                          jmeasuredWidth, tbd);
709        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
710                                      JNI_ABORT);
711        return count;
712    }
713
714    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
715                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
716        NPE_CHECK_RETURN_ZERO(env, jpaint);
717        NPE_CHECK_RETURN_ZERO(env, jtext);
718
719        SkPaint::TextBufferDirection tbd = forwards ?
720                                        SkPaint::kForward_TextBufferDirection :
721                                        SkPaint::kBackward_TextBufferDirection;
722
723        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
724        int count = env->GetStringLength(jtext);
725        const jchar* text = env->GetStringChars(jtext, NULL);
726        count = breakText(env, *paint, text, count, maxWidth,
727                          jmeasuredWidth, tbd);
728        env->ReleaseStringChars(jtext, text);
729        return count;
730    }
731
732    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
733                             jobject bounds, const SkPaint& paint)
734    {
735        SkRect  r;
736        SkIRect ir;
737
738        paint.measureText(text, count << 1, &r);
739        r.roundOut(&ir);
740        GraphicsJNI::irect_to_jrect(ir, env, bounds);
741    }
742
743    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
744                                jstring text, int start, int end, jobject bounds)
745    {
746        const jchar* textArray = env->GetStringChars(text, NULL);
747        doTextBounds(env, textArray + start, end - start, bounds, *paint);
748        env->ReleaseStringChars(text, textArray);
749    }
750
751    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
752                        jcharArray text, int index, int count, jobject bounds)
753    {
754        const jchar* textArray = env->GetCharArrayElements(text, NULL);
755        doTextBounds(env, textArray + index, count, bounds, *paint);
756        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
757                                      JNI_ABORT);
758    }
759
760};
761
762static JNINativeMethod methods[] = {
763    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
764    {"native_init","()I", (void*) SkPaintGlue::init},
765    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
766    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
767    {"native_set","(II)V", (void*) SkPaintGlue::assign},
768    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
769    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
770    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
771    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
772    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
773    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
774    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
775    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
776    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
777    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
778    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
779    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
780    {"getColor","()I", (void*) SkPaintGlue::getColor},
781    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
782    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
783    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
784    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
785    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
786    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
787    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
788    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
789    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
790    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
791    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
792    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
793    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
794    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
795    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
796    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
797    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
798    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
799    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
800    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
801    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
802    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
803    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
804    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
805    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
806    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
807    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
808    {"ascent","()F", (void*) SkPaintGlue::ascent},
809    {"descent","()F", (void*) SkPaintGlue::descent},
810    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
811    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
812    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
813    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
814    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
815    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
816    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
817    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
818    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
819    {"native_getTextRunAdvances","(I[CIIIII[FI)F",
820        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
821    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
822        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
823    {"native_getTextRunAdvancesICU","(I[CIIIII[FI)F",
824        (void*) SkPaintGlue::getTextRunAdvancesICU___CIIIII_FI},
825    {"native_getTextRunAdvancesICU","(ILjava/lang/String;IIIII[FI)F",
826        (void*) SkPaintGlue::getTextRunAdvancesICU__StringIIIII_FI},
827    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
828        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
829    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
830    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
831        (void*) SkPaintGlue::getTextRunCursor__String},
832    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
833    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
834    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
835                                        (void*) SkPaintGlue::getStringBounds },
836    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
837                                    (void*) SkPaintGlue::getCharArrayBounds },
838    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
839};
840
841static jfieldID req_fieldID(jfieldID id) {
842    SkASSERT(id);
843    return id;
844}
845
846int register_android_graphics_Paint(JNIEnv* env) {
847    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
848    SkASSERT(gFontMetrics_class);
849    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
850
851    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
852    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
853    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
854    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
855    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
856
857    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
858    SkASSERT(gFontMetricsInt_class);
859    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
860
861    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
862    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
863    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
864    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
865    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
866
867    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
868        sizeof(methods) / sizeof(methods[0]));
869    return result;
870}
871
872}
873