Paint.cpp revision 1de9e7a9dffb4391a446000f748e4c017d948f6b 
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            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
331            return 0;
332        }
333
334        const SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
335        const jchar* textArray = env->GetCharArrayElements(text, NULL);
336        // we double count, since measureText wants a byteLength
337        SkScalar width = paint->measureText(textArray + index, count << 1);
338        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
339                                      JNI_ABORT);
340
341        return SkScalarToFloat(width);
342    }
343
344    static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
345        NPE_CHECK_RETURN_ZERO(env, jpaint);
346        NPE_CHECK_RETURN_ZERO(env, text);
347
348        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
349        const jchar* textArray = env->GetStringChars(text, NULL);
350        size_t textLength = env->GetStringLength(text);
351
352        int count = end - start;
353        if ((start | count) < 0 || (size_t)count > textLength) {
354            doThrow(env, "java/lang/IndexOutOfBoundsException");
355            return 0;
356        }
357
358        jfloat width = SkScalarToFloat(paint->measureText(textArray + start, count << 1));
359        env->ReleaseStringChars(text, textArray);
360        return width;
361    }
362
363    static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
364        NPE_CHECK_RETURN_ZERO(env, jpaint);
365        NPE_CHECK_RETURN_ZERO(env, text);
366
367        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
368        const jchar* textArray = env->GetStringChars(text, NULL);
369        size_t textLength = env->GetStringLength(text);
370
371        jfloat width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
372        env->ReleaseStringChars(text, textArray);
373        return width;
374    }
375
376    static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
377        AutoJavaFloatArray autoWidths(env, widths, count);
378        jfloat* widthsArray = autoWidths.ptr();
379        SkScalar* scalarArray = (SkScalar*)widthsArray;
380
381        count = paint->getTextWidths(text, count << 1, scalarArray);
382        for (int i = 0; i < count; i++) {
383            widthsArray[i] = SkScalarToFloat(scalarArray[i]);
384        }
385        return count;
386    }
387
388    static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
389        const jchar* textArray = env->GetCharArrayElements(text, NULL);
390        count = dotextwidths(env, paint, textArray + index, count, widths);
391        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
392                                      JNI_ABORT);
393        return count;
394    }
395
396    static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
397            int start, int end, jfloatArray widths) {
398        const jchar* textArray = env->GetStringChars(text, NULL);
399        int count = dotextwidths(env, paint, textArray + start, end - start, widths);
400        env->ReleaseStringChars(text, textArray);
401        return count;
402    }
403
404    static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
405            jint contextCount, jint flags, jcharArray glyphs) {
406        jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
407        HB_ShaperItem shaperItem;
408        HB_FontRec font;
409        FontData fontData;
410        TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text,
411                start, count, contextCount, flags);
412
413        int glyphCount = shaperItem.num_glyphs;
414        for (int i = 0; i < glyphCount; i++) {
415            glyphsArray[i] = (jchar) shaperItem.glyphs[i];
416        }
417        env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
418        return glyphCount;
419    }
420
421    static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
422            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
423            jcharArray glyphs) {
424        const jchar* textArray = env->GetStringChars(text, NULL);
425        int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
426                end - start, contextEnd - contextStart, flags, glyphs);
427        env->ReleaseStringChars(text, textArray);
428        return count;
429    }
430
431    static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
432                                    jint start, jint count, jint contextCount, jint flags,
433                                    jfloatArray advances, jint advancesIndex) {
434        jfloat advancesArray[count];
435        jfloat totalAdvance;
436
437        TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
438                                       advancesArray, totalAdvance);
439
440        if (advances != NULL) {
441            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
442        }
443        return totalAdvance;
444    }
445
446    static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
447                                    jint start, jint count, jint contextCount, jint flags,
448                                    jfloatArray advances, jint advancesIndex) {
449        jfloat advancesArray[count];
450        jfloat totalAdvance;
451
452        TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
453                                       advancesArray, totalAdvance);
454
455        if (advances != NULL) {
456            env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
457        }
458        return totalAdvance;
459    }
460
461    static float getTextRunAdvances___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
462            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
463            jint flags, jfloatArray advances, jint advancesIndex) {
464        jchar* textArray = env->GetCharArrayElements(text, NULL);
465        jfloat result = doTextRunAdvances(env, paint, textArray + contextIndex,
466            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
467        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
468        return result;
469    }
470
471    static float getTextRunAdvances__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
472            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
473            jfloatArray advances, jint advancesIndex) {
474        const jchar* textArray = env->GetStringChars(text, NULL);
475        jfloat result = doTextRunAdvances(env, paint, textArray + contextStart,
476            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
477            advancesIndex);
478        env->ReleaseStringChars(text, textArray);
479        return result;
480    }
481
482    static float getTextRunAdvancesICU___CIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
483            jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
484            jint flags, jfloatArray advances, jint advancesIndex) {
485        jchar* textArray = env->GetCharArrayElements(text, NULL);
486        jfloat result = doTextRunAdvancesICU(env, paint, textArray + contextIndex,
487            index - contextIndex, count, contextCount, flags, advances, advancesIndex);
488        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
489        return result;
490    }
491
492    static float getTextRunAdvancesICU__StringIIIII_FI(JNIEnv* env, jobject clazz, SkPaint* paint,
493            jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
494            jfloatArray advances, jint advancesIndex) {
495        const jchar* textArray = env->GetStringChars(text, NULL);
496        jfloat result = doTextRunAdvancesICU(env, paint, textArray + contextStart,
497            start - contextStart, end - start, contextEnd - contextStart, flags, advances,
498            advancesIndex);
499        env->ReleaseStringChars(text, textArray);
500        return result;
501    }
502
503    static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
504            jint count, jint flags, jint offset, jint opt) {
505        SkScalar scalarArray[count];
506        jchar buffer[count];
507
508        // this is where we'd call harfbuzz
509        // for now we just use ushape.c and widths returned from skia
510
511        int widths;
512        if (flags & 0x1) { // rtl, call arabic shaping in case
513            UErrorCode status = U_ZERO_ERROR;
514            // Use fixed length since we need to keep start and count valid
515            u_shapeArabic(text + start, count, buffer, count,
516                    U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL |
517                    U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status);
518            // we shouldn't fail unless there's an out of memory condition,
519            // in which case we're hosed anyway
520            for (int i = 0; i < count; ++i) {
521              if (buffer[i] == 0xffff) {
522                buffer[i] = 0x200b; // zero-width-space for skia
523              }
524            }
525            widths = paint->getTextWidths(buffer, count << 1, scalarArray);
526        } else {
527            widths = paint->getTextWidths(text + start, count << 1, scalarArray);
528        }
529
530        if (widths < count) {
531            // Skia operates on code points, not code units, so surrogate pairs return only one
532            // value. Expand the result so we have one value per UTF-16 code unit.
533
534            // Note, skia's getTextWidth gets confused if it encounters a surrogate pair,
535            // leaving the remaining widths zero.  Not nice.
536            const jchar *chars = text + start;
537            for (int i = count, p = widths - 1; --i > p;) {
538                if (chars[i] >= 0xdc00 && chars[i] < 0xe000 &&
539                        chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) {
540                    scalarArray[i] = 0;
541                } else {
542                  scalarArray[i] = scalarArray[--p];
543                }
544            }
545        }
546
547        jint pos = offset - start;
548        switch (opt) {
549        case AFTER:
550          if (pos < count) {
551            pos += 1;
552          }
553          // fall through
554        case AT_OR_AFTER:
555          while (pos < count && scalarArray[pos] == 0) {
556            ++pos;
557          }
558          break;
559        case BEFORE:
560          if (pos > 0) {
561            --pos;
562          }
563          // fall through
564        case AT_OR_BEFORE:
565          while (pos > 0 && scalarArray[pos] == 0) {
566            --pos;
567          }
568          break;
569        case AT:
570        default:
571          if (scalarArray[pos] == 0) {
572            pos = -1;
573          }
574          break;
575        }
576
577        if (pos != -1) {
578          pos += start;
579        }
580
581        return pos;
582    }
583
584    static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
585            jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
586        jchar* textArray = env->GetCharArrayElements(text, NULL);
587        jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
588                offset, cursorOpt);
589        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
590        return result;
591    }
592
593    static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
594            jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
595        const jchar* textArray = env->GetStringChars(text, NULL);
596        jint result = doTextRunCursor(env, paint, textArray, contextStart,
597                contextEnd - contextStart, flags, offset, cursorOpt);
598        env->ReleaseStringChars(text, textArray);
599        return result;
600    }
601
602    static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
603                            jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
604        TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
605    }
606
607    static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
608            jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
609        const jchar* textArray = env->GetCharArrayElements(text, NULL);
610        getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
611        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
612    }
613
614    static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
615            jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
616        const jchar* textArray = env->GetStringChars(text, NULL);
617        getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
618        env->ReleaseStringChars(text, textArray);
619    }
620
621    static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
622                               jfloat dx, jfloat dy, int color) {
623        NPE_CHECK_RETURN_VOID(env, jpaint);
624
625        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
626        if (radius <= 0) {
627            paint->setLooper(NULL);
628        }
629        else {
630            paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
631                                                  SkFloatToScalar(dx),
632                                                  SkFloatToScalar(dy),
633                                                  (SkColor)color))->unref();
634        }
635    }
636
637    static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[],
638                         int count, float maxWidth, jfloatArray jmeasured,
639                         SkPaint::TextBufferDirection tbd) {
640        SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
641
642        SkScalar     measured;
643        size_t       bytes = paint.breakText(text, count << 1,
644                                   SkFloatToScalar(maxWidth), &measured, tbd);
645        SkASSERT((bytes & 1) == 0);
646
647        if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
648            AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
649            jfloat* array = autoMeasured.ptr();
650            array[0] = SkScalarToFloat(measured);
651        }
652        return bytes >> 1;
653    }
654
655    static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
656            int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
657        NPE_CHECK_RETURN_ZERO(env, jpaint);
658        NPE_CHECK_RETURN_ZERO(env, jtext);
659
660        SkPaint::TextBufferDirection tbd;
661        if (count < 0) {
662            tbd = SkPaint::kBackward_TextBufferDirection;
663            count = -count;
664        }
665        else {
666            tbd = SkPaint::kForward_TextBufferDirection;
667        }
668
669        if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
670            doThrow(env, "java/lang/ArrayIndexOutOfBoundsException");
671            return 0;
672        }
673
674        SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
675        const jchar* text = env->GetCharArrayElements(jtext, NULL);
676        count = breakText(env, *paint, text + index, count, maxWidth,
677                          jmeasuredWidth, tbd);
678        env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
679                                      JNI_ABORT);
680        return count;
681    }
682
683    static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
684                bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
685        NPE_CHECK_RETURN_ZERO(env, jpaint);
686        NPE_CHECK_RETURN_ZERO(env, jtext);
687
688        SkPaint::TextBufferDirection tbd = forwards ?
689                                        SkPaint::kForward_TextBufferDirection :
690                                        SkPaint::kBackward_TextBufferDirection;
691
692        SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
693        int count = env->GetStringLength(jtext);
694        const jchar* text = env->GetStringChars(jtext, NULL);
695        count = breakText(env, *paint, text, count, maxWidth,
696                          jmeasuredWidth, tbd);
697        env->ReleaseStringChars(jtext, text);
698        return count;
699    }
700
701    static void doTextBounds(JNIEnv* env, const jchar* text, int count,
702                             jobject bounds, const SkPaint& paint)
703    {
704        SkRect  r;
705        SkIRect ir;
706
707        paint.measureText(text, count << 1, &r);
708        r.roundOut(&ir);
709        GraphicsJNI::irect_to_jrect(ir, env, bounds);
710    }
711
712    static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
713                                jstring text, int start, int end, jobject bounds)
714    {
715        const jchar* textArray = env->GetStringChars(text, NULL);
716        doTextBounds(env, textArray + start, end - start, bounds, *paint);
717        env->ReleaseStringChars(text, textArray);
718    }
719
720    static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
721                        jcharArray text, int index, int count, jobject bounds)
722    {
723        const jchar* textArray = env->GetCharArrayElements(text, NULL);
724        doTextBounds(env, textArray + index, count, bounds, *paint);
725        env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
726                                      JNI_ABORT);
727    }
728
729};
730
731static JNINativeMethod methods[] = {
732    {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
733    {"native_init","()I", (void*) SkPaintGlue::init},
734    {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
735    {"native_reset","(I)V", (void*) SkPaintGlue::reset},
736    {"native_set","(II)V", (void*) SkPaintGlue::assign},
737    {"getFlags","()I", (void*) SkPaintGlue::getFlags},
738    {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
739    {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
740    {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
741    {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
742    {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
743    {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
744    {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
745    {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
746    {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
747    {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
748    {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
749    {"getColor","()I", (void*) SkPaintGlue::getColor},
750    {"setColor","(I)V", (void*) SkPaintGlue::setColor},
751    {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
752    {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
753    {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
754    {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
755    {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
756    {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
757    {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
758    {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
759    {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
760    {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
761    {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
762    {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
763    {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
764    {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
765    {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
766    {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
767    {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
768    {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
769    {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
770    {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
771    {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
772    {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
773    {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
774    {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
775    {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
776    {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
777    {"ascent","()F", (void*) SkPaintGlue::ascent},
778    {"descent","()F", (void*) SkPaintGlue::descent},
779    {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
780    {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
781    {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
782    {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
783    {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
784    {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
785    {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
786    {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
787    {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
788    {"native_getTextRunAdvances","(I[CIIIII[FI)F",
789        (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FI},
790    {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FI)F",
791        (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FI},
792    {"native_getTextRunAdvancesICU","(I[CIIIII[FI)F",
793        (void*) SkPaintGlue::getTextRunAdvancesICU___CIIIII_FI},
794    {"native_getTextRunAdvancesICU","(ILjava/lang/String;IIIII[FI)F",
795        (void*) SkPaintGlue::getTextRunAdvancesICU__StringIIIII_FI},
796    {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
797        (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
798    {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
799    {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
800        (void*) SkPaintGlue::getTextRunCursor__String},
801    {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
802    {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
803    {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
804                                        (void*) SkPaintGlue::getStringBounds },
805    {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
806                                    (void*) SkPaintGlue::getCharArrayBounds },
807    {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
808};
809
810static jfieldID req_fieldID(jfieldID id) {
811    SkASSERT(id);
812    return id;
813}
814
815int register_android_graphics_Paint(JNIEnv* env) {
816    gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
817    SkASSERT(gFontMetrics_class);
818    gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
819
820    gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
821    gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
822    gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
823    gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
824    gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
825
826    gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
827    SkASSERT(gFontMetricsInt_class);
828    gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
829
830    gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
831    gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
832    gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
833    gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
834    gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
835
836    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
837        sizeof(methods) / sizeof(methods[0]));
838    return result;
839}
840
841}
842