Paint.cpp revision 0c702b88c5d0d4380930b920f5be6e66dd95a0d8 
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
36// temporary for debugging
37#include <utils/Log.h>
38
39namespace android {
40
41struct JMetricsID {
42    jfieldID    top;
43    jfieldID    ascent;
44    jfieldID    descent;
45    jfieldID    bottom;
46    jfieldID    leading;
47};
48
49static jclass   gFontMetrics_class;
50static JMetricsID gFontMetrics_fieldID;
51
52static jclass   gFontMetricsInt_class;
53static JMetricsID gFontMetricsInt_fieldID;
54
55static void defaultSettingsForAndroid(SkPaint* paint) {
56    // looks best we decided
57    paint->setHinting(SkPaint::kSlight_Hinting);
58    // utf16 is required for java
59    paint->setTextEncoding(SkPaint::kUTF16_TextEncoding);
60}
61
62class SkPaintGlue {
63public:
64    enum MoveOpt {
65        AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
66    };
67
68    static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
69        delete obj;
70    }
71
72    static SkPaint* init(JNIEnv* env, jobject clazz) {
73        SkPaint* obj = new SkPaint();
74        defaultSettingsForAndroid(obj);
75        return obj;
76    }
77
78    static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
79        SkPaint* obj = new SkPaint(*paint);
80        return obj;
81    }
82
83    static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
84        obj->reset();
85        defaultSettingsForAndroid(obj);
86    }
87
88    static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
89        *dst = *src;
90    }
91
92    static jint getFlags(JNIEnv* env, jobject paint) {
93        NPE_CHECK_RETURN_ZERO(env, paint);
94        return GraphicsJNI::getNativePaint(env, paint)->getFlags();
95    }
96
97    static void setFlags(JNIEnv* env, jobject paint, jint flags) {
98        NPE_CHECK_RETURN_VOID(env, paint);
99        GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
100    }
101
102    static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
103        NPE_CHECK_RETURN_VOID(env, paint);
104        GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
105    }
106
107    static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
108        NPE_CHECK_RETURN_VOID(env, paint);
109        GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
110    }
111
112    static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
113        NPE_CHECK_RETURN_VOID(env, paint);
114        GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
115    }
116
117    static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
118        NPE_CHECK_RETURN_VOID(env, paint);
119        GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
120    }
121
122    static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
123        NPE_CHECK_RETURN_VOID(env, paint);
124        GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
125    }
126
127    static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
128        NPE_CHECK_RETURN_VOID(env, paint);
129        GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
130    }
131
132    static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
133        NPE_CHECK_RETURN_VOID(env, paint);
134        GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
135    }
136
137    static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
138        NPE_CHECK_RETURN_VOID(env, paint);
139        GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
140    }
141
142    static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
143        return obj->getStyle();
144    }
145
146    static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
147        obj->setStyle(style);
148    }
149
150    static jint getColor(JNIEnv* env, jobject paint) {
151        NPE_CHECK_RETURN_ZERO(env, paint);
152        return GraphicsJNI::getNativePaint(env, paint)->getColor();
153    }
154
155    static jint getAlpha(JNIEnv* env, jobject paint) {
156        NPE_CHECK_RETURN_ZERO(env, paint);
157        return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
158    }
159
160    static void setColor(JNIEnv* env, jobject paint, jint color) {
161        NPE_CHECK_RETURN_VOID(env, paint);
162        GraphicsJNI::getNativePaint(env, paint)->setColor(color);
163    }
164
165    static void setAlpha(JNIEnv* env, jobject paint, jint a) {
166        NPE_CHECK_RETURN_VOID(env, paint);
167        GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
168    }
169
170    static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
171        NPE_CHECK_RETURN_ZERO(env, paint);
172        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
173    }
174
175    static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
176        NPE_CHECK_RETURN_VOID(env, paint);
177        GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
178    }
179
180    static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
181        NPE_CHECK_RETURN_ZERO(env, paint);
182        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
183    }
184
185    static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
186        NPE_CHECK_RETURN_VOID(env, paint);
187        GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
188    }
189
190    static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
191        return obj->getStrokeCap();
192    }
193
194    static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
195        obj->setStrokeCap(cap);
196    }
197
198    static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
199        return obj->getStrokeJoin();
200    }
201
202    static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
203        obj->setStrokeJoin(join);
204    }
205
206    static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
207        return obj->getFillPath(*src, dst);
208    }
209
210    static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
211        return obj->setShader(shader);
212    }
213
214    static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
215        return obj->setColorFilter(filter);
216    }
217
218    static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
219        return obj->setXfermode(xfermode);
220    }
221
222    static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
223        return obj->setPathEffect(effect);
224    }
225
226    static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
227        return obj->setMaskFilter(maskfilter);
228    }
229
230    static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
231        return obj->setTypeface(typeface);
232    }
233
234    static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
235        return obj->setRasterizer(rasterizer);
236    }
237
238    static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
239        return obj->getTextAlign();
240    }
241
242    static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
243        obj->setTextAlign(align);
244    }
245
246    static jfloat getTextSize(JNIEnv* env, jobject paint) {
247        NPE_CHECK_RETURN_ZERO(env, paint);
248        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
249    }
250
251    static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
252        NPE_CHECK_RETURN_VOID(env, paint);
253        GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
254    }
255
256    static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
257        NPE_CHECK_RETURN_ZERO(env, paint);
258        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
259    }
260
261    static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
262        NPE_CHECK_RETURN_VOID(env, paint);
263        GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
264    }
265
266    static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
267        NPE_CHECK_RETURN_ZERO(env, paint);
268        return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
269    }
270
271    static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
272        NPE_CHECK_RETURN_VOID(env, paint);
273        GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
274    }
275
276    static jfloat ascent(JNIEnv* env, jobject paint) {
277        NPE_CHECK_RETURN_ZERO(env, paint);
278        SkPaint::FontMetrics    metrics;
279        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
280        return SkScalarToFloat(metrics.fAscent);
281    }
282
283    static jfloat descent(JNIEnv* env, jobject paint) {
284        NPE_CHECK_RETURN_ZERO(env, paint);
285        SkPaint::FontMetrics    metrics;
286        (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
287        return SkScalarToFloat(metrics.fDescent);
288    }
289
290    static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
291        NPE_CHECK_RETURN_ZERO(env, paint);
292        SkPaint::FontMetrics metrics;
293        SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
294
295        if (metricsObj) {
296            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
297            env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
298            env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
299            env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
300            env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
301            env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
302        }
303        return SkScalarToFloat(spacing);
304    }
305
306    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
307        NPE_CHECK_RETURN_ZERO(env, paint);
308        SkPaint::FontMetrics metrics;
309
310        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
311        int ascent = SkScalarRound(metrics.fAscent);
312        int descent = SkScalarRound(metrics.fDescent);
313        int leading = SkScalarRound(metrics.fLeading);
314
315        if (metricsObj) {
316            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
317            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
318            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
319            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
320            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
321            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
322        }
323        return descent - ascent + leading;
324    }
325
326    static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
327        NPE_CHECK_RETURN_ZERO(env, jpaint);
328        NPE_CHECK_RETURN_ZERO(env, text);
329
330        size_t textLength = env->GetArrayLength(text);
331
332        if ((index | count) < 0 || (size_t)(index + count) > textLength) {
333            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
334            return 0;
335        }
336
337        const SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
338        const jchar* textArray = env->GetCharArrayElements(text, NULL);
339        // we double count, since measureText wants a byteLength
340        SkScalar width = paint->measureText(textArray + index, count << 1);
341        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
342                                      JNI_ABORT);
343
344        return SkScalarToFloat(width);
345    }
346
347    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
348        NPE_CHECK_RETURN_ZERO(env, jpaint);
349        NPE_CHECK_RETURN_ZERO(env, text);
350
351        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
352        const jchar* textArray = env->GetStringChars(text, NULL);
353        size_t textLength = env->GetStringLength(text);
354
355        int count = end - start;
356        if ((start | count) < 0 || (size_t)count > textLength) {
357            doThrow(env, "java/lang/IndexOutOfBoundsException");
358            return 0;
359        }
360
361        jfloat width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
362        env->ReleaseStringChars(text, textArray);
363        return width;
364    }
365
366    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
367        NPE_CHECK_RETURN_ZERO(env, jpaint);
368        NPE_CHECK_RETURN_ZERO(env, text);
369
370        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
371        const jchar* textArray = env->GetStringChars(text, NULL);
372        size_t textLength = env->GetStringLength(text);
373
374        jfloat width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
375        env->ReleaseStringChars(text, textArray);
376        return width;
377    }
378
379    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
380        AutoJavaFloatArray autoWidths(env, widths, count);
381        jfloat* widthsArray = autoWidths.ptr();
382        SkScalar* scalarArray = (SkScalar*)widthsArray;
383
384        count = paint->getTextWidths(text, count << 1, scalarArray);
385        for (int i = 0; i < count; i++) {
386            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
387        }
388        return count;
389    }
390
391    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
392        const jchar* textArray = env->GetCharArrayElements(text, NULL);
393        count = dotextwidths(env, paint, textArray + index, count, widths);
394        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
395                                      JNI_ABORT);
396        return count;
397    }
398
399    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, int start, int end, jfloatArray widths) {
400        const jchar* textArray = env->GetStringChars(text, NULL);
401        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
402        env->ReleaseStringChars(text, textArray);
403        return count;
404    }
405
406    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text, jint start, jint count, jint contextCount, jint flags,
407                                    jfloatArray advances, jint advancesIndex) {
408        jfloat advancesArray[count];
409        jchar buffer[contextCount];
410
411        SkScalar* scalarArray = (SkScalar *)advancesArray;
412        jfloat totalAdvance = 0;
413
414        // this is where we'd call harfbuzz
415        // for now we just use ushape.c
416
417        int widths;
418        if (flags & 0x1) { // rtl, call arabic shaping in case
419            UErrorCode status = U_ZERO_ERROR;
420            // Use fixed length since we need to keep start and count valid
421            u_shapeArabic(text, contextCount, buffer, contextCount,
422                          U_SHAPE_LENGTH_FIXED_SPACES_NEAR |
423                          U_SHAPE_TEXT_DIRECTION_LOGICAL | U_SHAPE_LETTERS_SHAPE |
424                          U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
425            // we shouldn't fail unless there's an out of memory condition,
426            // in which case we're hosed anyway
427            for (int i = start, e = i + count; i < e; ++i) {
428              if (buffer[i] == 0xffff) {
429                buffer[i] = 0x200b; // zero-width-space for skia
430              }
431            }
432            widths = paint->getTextWidths(buffer + start, count << 1, scalarArray);
433        } else {
434            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
435        }
436
437        if (widths < count) {
438            // Skia operates on code points, not code units, so surrogate pairs return only
439            // one value. Expand the result so we have one value per UTF-16 code unit.
440
441            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
442            // leaving the remaining widths zero.  Not nice.
443            const jchar *chars = text + start;
444            for (int i = 0, p = 0; i < widths; ++i) {
445                totalAdvance += advancesArray[p++] = SkScalarToFloat(scalarArray[i]);
446                if (p < count && chars[p] >= 0xdc00 && chars[p] < 0xe000 &&
447                        chars[p-1] >= 0xd800 && chars[p-1] < 0xdc00) {
448                    advancesArray[p++] = 0;
449                }
450            }
451        } else {
452            for (int i = 0; i < count; i++) {
453                totalAdvance += advancesArray[i] = SkScalarToFloat(scalarArray[i]);
454            }
455        }
456
457        if (advances != NULL) {
458            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
459        }
460        return totalAdvance;
461    }
462
463    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
464            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
465            jint flags, jfloatArray advances, jint advancesIndex) {
466        jchar* textArray = env->GetCharArrayElements(text, NULL);
467        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
468            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
469        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
470        return result;
471    }
472
473    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
474            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
475            jfloatArray advances, jint advancesIndex) {
476        const jchar* textArray = env->GetStringChars(text, NULL);
477        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
478            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
479            advancesIndex);
480        env->ReleaseStringChars(text, textArray);
481        return result;
482    }
483
484    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
485            jint count, jint flags, jint offset, jint opt) {
486        SkScalar scalarArray[count];
487        jchar buffer[count];
488
489        // this is where we'd call harfbuzz
490        // for now we just use ushape.c and widths returned from skia
491
492        int widths;
493        if (flags & 0x1) { // rtl, call arabic shaping in case
494            UErrorCode status = U_ZERO_ERROR;
495            // Use fixed length since we need to keep start and count valid
496            u_shapeArabic(text + start, count, buffer, count,
497                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
498                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
499            // we shouldn't fail unless there's an out of memory condition,
500            // in which case we're hosed anyway
501            for (int i = 0; i < count; ++i) {
502              if (buffer[i] == 0xffff) {
503                buffer[i] = 0x200b; // zero-width-space for skia
504              }
505            }
506            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
507        } else {
508            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
509        }
510
511        if (widths < count) {
512            // Skia operates on code points, not code units, so surrogate pairs return only one
513            // value. Expand the result so we have one value per UTF-16 code unit.
514
515            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
516            // leaving the remaining widths zero.  Not nice.
517            const jchar *chars = text + start;
518            for (int i = count, p = widths - 1; --i > p;) {
519                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
520                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
521                    scalarArray[i] = 0;
522                } else {
523                  scalarArray[i] = scalarArray[--p];
524                }
525            }
526        }
527
528        jint pos = offset - start;
529        switch (opt) {
530        case AFTER:
531          if (pos < count) {
532            pos += 1;
533          }
534          // fall through
535        case AT_OR_AFTER:
536          while (pos < count && scalarArray[pos] == 0) {
537            ++pos;
538          }
539          break;
540        case BEFORE:
541          if (pos > 0) {
542            --pos;
543          }
544          // fall through
545        case AT_OR_BEFORE:
546          while (pos > 0 && scalarArray[pos] == 0) {
547            --pos;
548          }
549          break;
550        case AT:
551        default:
552          if (scalarArray[pos] == 0) {
553            pos = -1;
554          }
555          break;
556        }
557
558        if (pos != -1) {
559          pos += start;
560        }
561
562        return pos;
563    }
564
565    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
566            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
567        jchar* textArray = env->GetCharArrayElements(text, NULL);
568        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
569                offset, cursorOpt);
570        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
571        return result;
572    }
573
574    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
575            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
576        const jchar* textArray = env->GetStringChars(text, NULL);
577        jint result = doTextRunCursor(env, paint, textArray, contextStart,
578                contextEnd - contextStart, flags, offset, cursorOpt);
579        env->ReleaseStringChars(text, textArray);
580        return result;
581    }
582
583    static void getTextPath___CIIFFPath(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
584        const jchar* textArray = env->GetCharArrayElements(text, NULL);
585        paint->getTextPath(textArray + index, count << 1, SkFloatToScalar(x), SkFloatToScalar(y), path);
586        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
587                                      JNI_ABORT);
588    }
589
590    static void getTextPath__StringIIFFPath(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
591        const jchar* textArray = env->GetStringChars(text, NULL);
592        paint->getTextPath(textArray + start, (end - start) << 1, SkFloatToScalar(x), SkFloatToScalar(y), path);
593        env->ReleaseStringChars(text, textArray);
594    }
595
596    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
597                               jfloat dx, jfloat dy, int color) {
598        NPE_CHECK_RETURN_VOID(env, jpaint);
599
600        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
601        if (radius <= 0) {
602            paint->setLooper(NULL);
603        }
604        else {
605            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
606                                                  SkFloatToScalar(dx),
607                                                  SkFloatToScalar(dy),
608                                                  (SkColor)color))->unref();
609        }
610    }
611
612    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
613                         int count, float maxWidth, jfloatArray jmeasured,
614                         SkPaint::TextBufferDirection tbd) {
615        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
616
617        SkScalar     measured;
618        size_t       bytes = paint.breakText(text, count << 1,
619                                   SkFloatToScalar(maxWidth), &measured, tbd);
620        SkASSERT((bytes & 1) == 0);
621
622        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
623            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
624            jfloat* array = autoMeasured.ptr();
625            array[0] = SkScalarToFloat(measured);
626        }
627        return bytes >> 1;
628    }
629
630    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
631            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
632        NPE_CHECK_RETURN_ZERO(env, jpaint);
633        NPE_CHECK_RETURN_ZERO(env, jtext);
634
635        SkPaint::TextBufferDirection tbd;
636        if (count < 0) {
637            tbd = SkPaint::kBackward_TextBufferDirection;
638            count = -count;
639        }
640        else {
641            tbd = SkPaint::kForward_TextBufferDirection;
642        }
643
644        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
645            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
646            return 0;
647        }
648
649        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
650        const jchar* text = env->GetCharArrayElements(jtext, NULL);
651        count = breakText(env, *paint, text + index, count, maxWidth,
652                          jmeasuredWidth, tbd);
653        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
654                                      JNI_ABORT);
655        return count;
656    }
657
658    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
659                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
660        NPE_CHECK_RETURN_ZERO(env, jpaint);
661        NPE_CHECK_RETURN_ZERO(env, jtext);
662
663        SkPaint::TextBufferDirection tbd = forwards ?
664                                        SkPaint::kForward_TextBufferDirection :
665                                        SkPaint::kBackward_TextBufferDirection;
666
667        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
668        int count = env->GetStringLength(jtext);
669        const jchar* text = env->GetStringChars(jtext, NULL);
670        count = breakText(env, *paint, text, count, maxWidth,
671                          jmeasuredWidth, tbd);
672        env->ReleaseStringChars(jtext, text);
673        return count;
674    }
675
676    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
677                             jobject bounds, const SkPaint& paint)
678    {
679        SkRect  r;
680        SkIRect ir;
681
682        paint.measureText(text, count << 1, &r);
683        r.roundOut(&ir);
684        GraphicsJNI::irect_to_jrect(ir, env, bounds);
685    }
686
687    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
688                                jstring text, int start, int end, jobject bounds)
689    {
690        const jchar* textArray = env->GetStringChars(text, NULL);
691        doTextBounds(env, textArray + start, end - start, bounds, *paint);
692        env->ReleaseStringChars(text, textArray);
693    }
694
695    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
696                        jcharArray text, int index, int count, jobject bounds)
697    {
698        const jchar* textArray = env->GetCharArrayElements(text, NULL);
699        doTextBounds(env, textArray + index, count, bounds, *paint);
700        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
701                                      JNI_ABORT);
702    }
703
704};
705
706static JNINativeMethod methods[] = {
707    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
708    {"native_init","()I", (void*) SkPaintGlue::init},
709    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
710    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
711    {"native_set","(II)V", (void*) SkPaintGlue::assign},
712    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
713    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
714    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
715    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
716    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
717    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
718    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
719    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
720    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
721    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
722    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
723    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
724    {"getColor","()I", (void*) SkPaintGlue::getColor},
725    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
726    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
727    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
728    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
729    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
730    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
731    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
732    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
733    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
734    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
735    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
736    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
737    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
738    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
739    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
740    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
741    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
742    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
743    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
744    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
745    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
746    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
747    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
748    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
749    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
750    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
751    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
752    {"ascent","()F", (void*) SkPaintGlue::ascent},
753    {"descent","()F", (void*) SkPaintGlue::descent},
754    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
755    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
756    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
757    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
758    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
759    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
760    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
761    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
762    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
763    {"native_getTextRunAdvances","(I[CIIIII[FI)F", (void*)
764        SkPaintGlue::getTextRunAdvances___CIIIII_FI},
765    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
766        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
767    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
768    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
769        (void*) SkPaintGlue::getTextRunCursor__String},
770    {"native_getTextPath","(I[CIIFFI)V", (void*) SkPaintGlue::getTextPath___CIIFFPath},
771    {"native_getTextPath","(ILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__StringIIFFPath},
772    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
773                                        (void*) SkPaintGlue::getStringBounds },
774    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
775                                    (void*) SkPaintGlue::getCharArrayBounds },
776    {"setShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
777};
778
779static jfieldID req_fieldID(jfieldID id) {
780    SkASSERT(id);
781    return id;
782}
783
784int register_android_graphics_Paint(JNIEnv* env) {
785    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
786    SkASSERT(gFontMetrics_class);
787    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
788
789    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
790    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
791    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
792    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
793    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
794
795    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
796    SkASSERT(gFontMetricsInt_class);
797    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
798
799    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
800    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
801    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
802    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
803    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
804
805    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
806        sizeof(methods) / sizeof(methods[0]));
807    return result;
808}
809
810}
811