Paint.cpp revision f7cb1f75fdaedf996cab7c4690b080adc7bc5b97 
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// This file was generated from the C++ include file: SkPaint.h
19// Any changes made to this file will be discarded by the build.
20// To change this file, either edit the include, or device/tools/gluemaker/main.cpp,
21// or one of the auxilary file specifications in device/tools/gluemaker.
22
23#include "jni.h"
24#include "GraphicsJNI.h"
25#include <android_runtime/AndroidRuntime.h>
26
27#include "SkBlurDrawLooper.h"
28#include "SkColorFilter.h"
29#include "SkMaskFilter.h"
30#include "SkRasterizer.h"
31#include "SkShader.h"
32#include "SkTypeface.h"
33#include "SkXfermode.h"
34#include "unicode/ushape.h"
35#include "TextLayout.h"
36
37// temporary for debugging
38#include <utils/Log.h>
39
40namespace android {
41
42struct JMetricsID {
43    jfieldID    top;
44    jfieldID    ascent;
45    jfieldID    descent;
46    jfieldID    bottom;
47    jfieldID    leading;
48};
49
50static jclass   gFontMetrics_class;
51static JMetricsID gFontMetrics_fieldID;
52
53static jclass   gFontMetricsInt_class;
54static JMetricsID gFontMetricsInt_fieldID;
55
56static void defaultSettingsForAndroid(SkPaint* paint) {
57    // looks best we decided
58    paint->setHinting(SkPaint::kSlight_Hinting);
59    // utf16 is required for java
60    paint->setTextEncoding(SkPaint::kUTF16_TextEncoding);
61}
62
63class SkPaintGlue {
64public:
65    enum MoveOpt {
66        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
67    };
68
69    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
70        delete obj;
71    }
72
73    static SkPaint* init(JNIEnv* env, jobject clazz) {
74        SkPaint* obj = new SkPaint();
75        defaultSettingsForAndroid(obj);
76        return obj;
77    }
78
79    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
80        SkPaint* obj = new SkPaint(*paint);
81        return obj;
82    }
83
84    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
85        obj->reset();
86        defaultSettingsForAndroid(obj);
87    }
88
89    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
90        *dst = *src;
91    }
92
93    static jint getFlags(JNIEnv* env, jobject paint) {
94        NPE_CHECK_RETURN_ZERO(env, paint);
95        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
96    }
97
98    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
99        NPE_CHECK_RETURN_VOID(env, paint);
100        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
101    }
102
103    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
104        NPE_CHECK_RETURN_VOID(env, paint);
105        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
106    }
107
108    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
109        NPE_CHECK_RETURN_VOID(env, paint);
110        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
111    }
112
113    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
114        NPE_CHECK_RETURN_VOID(env, paint);
115        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
116    }
117
118    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
119        NPE_CHECK_RETURN_VOID(env, paint);
120        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
121    }
122
123    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
124        NPE_CHECK_RETURN_VOID(env, paint);
125        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
126    }
127
128    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
129        NPE_CHECK_RETURN_VOID(env, paint);
130        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
131    }
132
133    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
134        NPE_CHECK_RETURN_VOID(env, paint);
135        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
136    }
137
138    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
139        NPE_CHECK_RETURN_VOID(env, paint);
140        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
141    }
142
143    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
144        return obj->getStyle();
145    }
146
147    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
148        obj->setStyle(style);
149    }
150
151    static jint getColor(JNIEnv* env, jobject paint) {
152        NPE_CHECK_RETURN_ZERO(env, paint);
153        return GraphicsJNI::getNativePaint(env, paint)->getColor();
154    }
155
156    static jint getAlpha(JNIEnv* env, jobject paint) {
157        NPE_CHECK_RETURN_ZERO(env, paint);
158        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
159    }
160
161    static void setColor(JNIEnv* env, jobject paint, jint color) {
162        NPE_CHECK_RETURN_VOID(env, paint);
163        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
164    }
165
166    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
167        NPE_CHECK_RETURN_VOID(env, paint);
168        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
169    }
170
171    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
172        NPE_CHECK_RETURN_ZERO(env, paint);
173        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
174    }
175
176    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
177        NPE_CHECK_RETURN_VOID(env, paint);
178        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
179    }
180
181    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
182        NPE_CHECK_RETURN_ZERO(env, paint);
183        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
184    }
185
186    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
187        NPE_CHECK_RETURN_VOID(env, paint);
188        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
189    }
190
191    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
192        return obj->getStrokeCap();
193    }
194
195    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
196        obj->setStrokeCap(cap);
197    }
198
199    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
200        return obj->getStrokeJoin();
201    }
202
203    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
204        obj->setStrokeJoin(join);
205    }
206
207    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
208        return obj->getFillPath(*src, dst);
209    }
210
211    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
212        return obj->setShader(shader);
213    }
214
215    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
216        return obj->setColorFilter(filter);
217    }
218
219    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
220        return obj->setXfermode(xfermode);
221    }
222
223    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
224        return obj->setPathEffect(effect);
225    }
226
227    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
228        return obj->setMaskFilter(maskfilter);
229    }
230
231    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
232        return obj->setTypeface(typeface);
233    }
234
235    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
236        return obj->setRasterizer(rasterizer);
237    }
238
239    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
240        return obj->getTextAlign();
241    }
242
243    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
244        obj->setTextAlign(align);
245    }
246
247    static jfloat getTextSize(JNIEnv* env, jobject paint) {
248        NPE_CHECK_RETURN_ZERO(env, paint);
249        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
250    }
251
252    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
253        NPE_CHECK_RETURN_VOID(env, paint);
254        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
255    }
256
257    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
258        NPE_CHECK_RETURN_ZERO(env, paint);
259        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
260    }
261
262    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
263        NPE_CHECK_RETURN_VOID(env, paint);
264        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
265    }
266
267    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
268        NPE_CHECK_RETURN_ZERO(env, paint);
269        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
270    }
271
272    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
273        NPE_CHECK_RETURN_VOID(env, paint);
274        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
275    }
276
277    static jfloat ascent(JNIEnv* env, jobject paint) {
278        NPE_CHECK_RETURN_ZERO(env, paint);
279        SkPaint::FontMetrics    metrics;
280        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
281        return SkScalarToFloat(metrics.fAscent);
282    }
283
284    static jfloat descent(JNIEnv* env, jobject paint) {
285        NPE_CHECK_RETURN_ZERO(env, paint);
286        SkPaint::FontMetrics    metrics;
287        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
288        return SkScalarToFloat(metrics.fDescent);
289    }
290
291    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
292        NPE_CHECK_RETURN_ZERO(env, paint);
293        SkPaint::FontMetrics metrics;
294        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
295
296        if (metricsObj) {
297            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
298            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
299            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
300            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
301            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
302            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
303        }
304        return SkScalarToFloat(spacing);
305    }
306
307    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
308        NPE_CHECK_RETURN_ZERO(env, paint);
309        SkPaint::FontMetrics metrics;
310
311        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
312        int ascent = SkScalarRound(metrics.fAscent);
313        int descent = SkScalarRound(metrics.fDescent);
314        int leading = SkScalarRound(metrics.fLeading);
315
316        if (metricsObj) {
317            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
318            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
319            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
320            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
321            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
322            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
323        }
324        return descent - ascent + leading;
325    }
326
327    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
328        NPE_CHECK_RETURN_ZERO(env, jpaint);
329        NPE_CHECK_RETURN_ZERO(env, text);
330
331        size_t textLength = env->GetArrayLength(text);
332
333        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
334            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
335            return 0;
336        }
337
338        const SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
339        const jchar* textArray = env->GetCharArrayElements(text, NULL);
340        // we double count, since measureText wants a byteLength
341        SkScalar width = paint->measureText(textArray + index, count << 1);
342        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
343                                      JNI_ABORT);
344
345        return SkScalarToFloat(width);
346    }
347
348    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
349        NPE_CHECK_RETURN_ZERO(env, jpaint);
350        NPE_CHECK_RETURN_ZERO(env, text);
351
352        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
353        const jchar* textArray = env->GetStringChars(text, NULL);
354        size_t textLength = env->GetStringLength(text);
355
356        int count = end - start;
357        if ((start | count) < 0 || (size_t)count > textLength) {
358            doThrow(env, "java/lang/IndexOutOfBoundsException");
359            return 0;
360        }
361
362        jfloat width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
363        env->ReleaseStringChars(text, textArray);
364        return width;
365    }
366
367    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
368        NPE_CHECK_RETURN_ZERO(env, jpaint);
369        NPE_CHECK_RETURN_ZERO(env, text);
370
371        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
372        const jchar* textArray = env->GetStringChars(text, NULL);
373        size_t textLength = env->GetStringLength(text);
374
375        jfloat width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
376        env->ReleaseStringChars(text, textArray);
377        return width;
378    }
379
380    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
381        AutoJavaFloatArray autoWidths(env, widths, count);
382        jfloat* widthsArray = autoWidths.ptr();
383        SkScalar* scalarArray = (SkScalar*)widthsArray;
384
385        count = paint->getTextWidths(text, count << 1, scalarArray);
386        for (int i = 0; i < count; i++) {
387            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
388        }
389        return count;
390    }
391
392    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
393        const jchar* textArray = env->GetCharArrayElements(text, NULL);
394        count = dotextwidths(env, paint, textArray + index, count, widths);
395        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
396                                      JNI_ABORT);
397        return count;
398    }
399
400    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, int start, int end, jfloatArray widths) {
401        const jchar* textArray = env->GetStringChars(text, NULL);
402        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
403        env->ReleaseStringChars(text, textArray);
404        return count;
405    }
406
407    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
408                                    jint start, jint count, jint contextCount, jint flags,
409                                    jfloatArray advances, jint advancesIndex) {
410        jfloat advancesArray[count];
411        jfloat totalAdvance;
412
413        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
414                                       advancesArray, totalAdvance);
415
416        if (advances != NULL) {
417            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
418        }
419        return totalAdvance;
420    }
421
422    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
423            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
424            jint flags, jfloatArray advances, jint advancesIndex) {
425        jchar* textArray = env->GetCharArrayElements(text, NULL);
426        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
427            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
428        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
429        return result;
430    }
431
432    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
433            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
434            jfloatArray advances, jint advancesIndex) {
435        const jchar* textArray = env->GetStringChars(text, NULL);
436        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
437            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
438            advancesIndex);
439        env->ReleaseStringChars(text, textArray);
440        return result;
441    }
442
443    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
444            jint count, jint flags, jint offset, jint opt) {
445        SkScalar scalarArray[count];
446        jchar buffer[count];
447
448        // this is where we'd call harfbuzz
449        // for now we just use ushape.c and widths returned from skia
450
451        int widths;
452        if (flags & 0x1) { // rtl, call arabic shaping in case
453            UErrorCode status = U_ZERO_ERROR;
454            // Use fixed length since we need to keep start and count valid
455            u_shapeArabic(text + start, count, buffer, count,
456                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
457                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
458            // we shouldn't fail unless there's an out of memory condition,
459            // in which case we're hosed anyway
460            for (int i = 0; i < count; ++i) {
461              if (buffer[i] == 0xffff) {
462                buffer[i] = 0x200b; // zero-width-space for skia
463              }
464            }
465            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
466        } else {
467            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
468        }
469
470        if (widths < count) {
471            // Skia operates on code points, not code units, so surrogate pairs return only one
472            // value. Expand the result so we have one value per UTF-16 code unit.
473
474            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
475            // leaving the remaining widths zero.  Not nice.
476            const jchar *chars = text + start;
477            for (int i = count, p = widths - 1; --i > p;) {
478                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
479                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
480                    scalarArray[i] = 0;
481                } else {
482                  scalarArray[i] = scalarArray[--p];
483                }
484            }
485        }
486
487        jint pos = offset - start;
488        switch (opt) {
489        case AFTER:
490          if (pos < count) {
491            pos += 1;
492          }
493          // fall through
494        case AT_OR_AFTER:
495          while (pos < count && scalarArray[pos] == 0) {
496            ++pos;
497          }
498          break;
499        case BEFORE:
500          if (pos > 0) {
501            --pos;
502          }
503          // fall through
504        case AT_OR_BEFORE:
505          while (pos > 0 && scalarArray[pos] == 0) {
506            --pos;
507          }
508          break;
509        case AT:
510        default:
511          if (scalarArray[pos] == 0) {
512            pos = -1;
513          }
514          break;
515        }
516
517        if (pos != -1) {
518          pos += start;
519        }
520
521        return pos;
522    }
523
524    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
525            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
526        jchar* textArray = env->GetCharArrayElements(text, NULL);
527        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
528                offset, cursorOpt);
529        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
530        return result;
531    }
532
533    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
534            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
535        const jchar* textArray = env->GetStringChars(text, NULL);
536        jint result = doTextRunCursor(env, paint, textArray, contextStart,
537                contextEnd - contextStart, flags, offset, cursorOpt);
538        env->ReleaseStringChars(text, textArray);
539        return result;
540    }
541
542    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
543                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
544        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
545    }
546
547    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
548            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
549        const jchar* textArray = env->GetCharArrayElements(text, NULL);
550        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
551        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
552    }
553
554    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
555            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
556        const jchar* textArray = env->GetStringChars(text, NULL);
557        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
558        env->ReleaseStringChars(text, textArray);
559    }
560
561    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
562                               jfloat dx, jfloat dy, int color) {
563        NPE_CHECK_RETURN_VOID(env, jpaint);
564
565        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
566        if (radius <= 0) {
567            paint->setLooper(NULL);
568        }
569        else {
570            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
571                                                  SkFloatToScalar(dx),
572                                                  SkFloatToScalar(dy),
573                                                  (SkColor)color))->unref();
574        }
575    }
576
577    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
578                         int count, float maxWidth, jfloatArray jmeasured,
579                         SkPaint::TextBufferDirection tbd) {
580        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
581
582        SkScalar     measured;
583        size_t       bytes = paint.breakText(text, count << 1,
584                                   SkFloatToScalar(maxWidth), &measured, tbd);
585        SkASSERT((bytes & 1) == 0);
586
587        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
588            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
589            jfloat* array = autoMeasured.ptr();
590            array[0] = SkScalarToFloat(measured);
591        }
592        return bytes >> 1;
593    }
594
595    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
596            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
597        NPE_CHECK_RETURN_ZERO(env, jpaint);
598        NPE_CHECK_RETURN_ZERO(env, jtext);
599
600        SkPaint::TextBufferDirection tbd;
601        if (count < 0) {
602            tbd = SkPaint::kBackward_TextBufferDirection;
603            count = -count;
604        }
605        else {
606            tbd = SkPaint::kForward_TextBufferDirection;
607        }
608
609        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
610            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
611            return 0;
612        }
613
614        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
615        const jchar* text = env->GetCharArrayElements(jtext, NULL);
616        count = breakText(env, *paint, text + index, count, maxWidth,
617                          jmeasuredWidth, tbd);
618        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
619                                      JNI_ABORT);
620        return count;
621    }
622
623    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
624                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
625        NPE_CHECK_RETURN_ZERO(env, jpaint);
626        NPE_CHECK_RETURN_ZERO(env, jtext);
627
628        SkPaint::TextBufferDirection tbd = forwards ?
629                                        SkPaint::kForward_TextBufferDirection :
630                                        SkPaint::kBackward_TextBufferDirection;
631
632        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
633        int count = env->GetStringLength(jtext);
634        const jchar* text = env->GetStringChars(jtext, NULL);
635        count = breakText(env, *paint, text, count, maxWidth,
636                          jmeasuredWidth, tbd);
637        env->ReleaseStringChars(jtext, text);
638        return count;
639    }
640
641    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
642                             jobject bounds, const SkPaint& paint)
643    {
644        SkRect  r;
645        SkIRect ir;
646
647        paint.measureText(text, count << 1, &r);
648        r.roundOut(&ir);
649        GraphicsJNI::irect_to_jrect(ir, env, bounds);
650    }
651
652    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
653                                jstring text, int start, int end, jobject bounds)
654    {
655        const jchar* textArray = env->GetStringChars(text, NULL);
656        doTextBounds(env, textArray + start, end - start, bounds, *paint);
657        env->ReleaseStringChars(text, textArray);
658    }
659
660    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
661                        jcharArray text, int index, int count, jobject bounds)
662    {
663        const jchar* textArray = env->GetCharArrayElements(text, NULL);
664        doTextBounds(env, textArray + index, count, bounds, *paint);
665        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
666                                      JNI_ABORT);
667    }
668
669};
670
671static JNINativeMethod methods[] = {
672    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
673    {"native_init","()I", (void*) SkPaintGlue::init},
674    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
675    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
676    {"native_set","(II)V", (void*) SkPaintGlue::assign},
677    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
678    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
679    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
680    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
681    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
682    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
683    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
684    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
685    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
686    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
687    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
688    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
689    {"getColor","()I", (void*) SkPaintGlue::getColor},
690    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
691    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
692    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
693    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
694    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
695    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
696    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
697    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
698    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
699    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
700    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
701    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
702    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
703    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
704    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
705    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
706    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
707    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
708    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
709    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
710    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
711    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
712    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
713    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
714    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
715    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
716    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
717    {"ascent","()F", (void*) SkPaintGlue::ascent},
718    {"descent","()F", (void*) SkPaintGlue::descent},
719    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
720    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
721    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
722    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
723    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
724    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
725    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
726    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
727    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
728    {"native_getTextRunAdvances","(I[CIIIII[FI)F", (void*)
729        SkPaintGlue::getTextRunAdvances___CIIIII_FI},
730    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
731        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
732    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
733    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
734        (void*) SkPaintGlue::getTextRunCursor__String},
735    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
736    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
737    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
738                                        (void*) SkPaintGlue::getStringBounds },
739    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
740                                    (void*) SkPaintGlue::getCharArrayBounds },
741    {"setShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
742};
743
744static jfieldID req_fieldID(jfieldID id) {
745    SkASSERT(id);
746    return id;
747}
748
749int register_android_graphics_Paint(JNIEnv* env) {
750    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
751    SkASSERT(gFontMetrics_class);
752    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
753
754    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
755    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
756    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
757    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
758    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
759
760    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
761    SkASSERT(gFontMetricsInt_class);
762    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
763
764    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
765    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
766    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
767    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
768    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
769
770    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
771        sizeof(methods) / sizeof(methods[0]));
772    return result;
773}
774
775}
776