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      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 #define LOG_TAG "Paint"
     19 
     20 #include <utils/Log.h>
     21 
     22 #include "jni.h"
     23 #include "GraphicsJNI.h"
     24 #include <android_runtime/AndroidRuntime.h>
     25 
     26 #include "SkBlurDrawLooper.h"
     27 #include "SkColorFilter.h"
     28 #include "SkMaskFilter.h"
     29 #include "SkRasterizer.h"
     30 #include "SkShader.h"
     31 #include "SkTypeface.h"
     32 #include "SkXfermode.h"
     33 #include "unicode/ushape.h"
     34 #include "TextLayout.h"
     35 
     36 // temporary for debugging
     37 #include <Caches.h>
     38 #include <utils/Log.h>
     39 
     40 namespace android {
     41 
     42 struct JMetricsID {
     43     jfieldID    top;
     44     jfieldID    ascent;
     45     jfieldID    descent;
     46     jfieldID    bottom;
     47     jfieldID    leading;
     48 };
     49 
     50 static jclass   gFontMetrics_class;
     51 static JMetricsID gFontMetrics_fieldID;
     52 
     53 static jclass   gFontMetricsInt_class;
     54 static JMetricsID gFontMetricsInt_fieldID;
     55 
     56 static void defaultSettingsForAndroid(SkPaint* paint) {
     57     // GlyphID encoding is required because we are using Harfbuzz shaping
     58     paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
     59 }
     60 
     61 class SkPaintGlue {
     62 public:
     63     enum MoveOpt {
     64         AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT
     65     };
     66 
     67     static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) {
     68         delete obj;
     69     }
     70 
     71     static SkPaint* init(JNIEnv* env, jobject clazz) {
     72         SkPaint* obj = new SkPaint();
     73         defaultSettingsForAndroid(obj);
     74         return obj;
     75     }
     76 
     77     static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) {
     78         SkPaint* obj = new SkPaint(*paint);
     79         return obj;
     80     }
     81 
     82     static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) {
     83         obj->reset();
     84         defaultSettingsForAndroid(obj);
     85     }
     86 
     87     static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) {
     88         *dst = *src;
     89     }
     90 
     91     static jint getFlags(JNIEnv* env, jobject paint) {
     92         NPE_CHECK_RETURN_ZERO(env, paint);
     93         return GraphicsJNI::getNativePaint(env, paint)->getFlags();
     94     }
     95 
     96     static void setFlags(JNIEnv* env, jobject paint, jint flags) {
     97         NPE_CHECK_RETURN_VOID(env, paint);
     98         GraphicsJNI::getNativePaint(env, paint)->setFlags(flags);
     99     }
    100 
    101     static jint getHinting(JNIEnv* env, jobject paint) {
    102         NPE_CHECK_RETURN_ZERO(env, paint);
    103         return GraphicsJNI::getNativePaint(env, paint)->getHinting()
    104                 == SkPaint::kNo_Hinting ? 0 : 1;
    105     }
    106 
    107     static void setHinting(JNIEnv* env, jobject paint, jint mode) {
    108         NPE_CHECK_RETURN_VOID(env, paint);
    109         GraphicsJNI::getNativePaint(env, paint)->setHinting(
    110                 mode == 0 ? SkPaint::kNo_Hinting : SkPaint::kSlight_Hinting);
    111     }
    112 
    113     static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) {
    114         NPE_CHECK_RETURN_VOID(env, paint);
    115         GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa);
    116     }
    117 
    118     static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) {
    119         NPE_CHECK_RETURN_VOID(env, paint);
    120         GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText);
    121     }
    122 
    123     static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) {
    124         NPE_CHECK_RETURN_VOID(env, paint);
    125         GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText);
    126     }
    127 
    128     static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) {
    129         NPE_CHECK_RETURN_VOID(env, paint);
    130         GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText);
    131     }
    132 
    133     static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) {
    134         NPE_CHECK_RETURN_VOID(env, paint);
    135         GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText);
    136     }
    137 
    138     static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) {
    139         NPE_CHECK_RETURN_VOID(env, paint);
    140         GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText);
    141     }
    142 
    143     static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) {
    144         NPE_CHECK_RETURN_VOID(env, paint);
    145         GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap);
    146     }
    147 
    148     static void setDither(JNIEnv* env, jobject paint, jboolean dither) {
    149         NPE_CHECK_RETURN_VOID(env, paint);
    150         GraphicsJNI::getNativePaint(env, paint)->setDither(dither);
    151     }
    152 
    153     static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) {
    154         return obj->getStyle();
    155     }
    156 
    157     static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) {
    158         obj->setStyle(style);
    159     }
    160 
    161     static jint getColor(JNIEnv* env, jobject paint) {
    162         NPE_CHECK_RETURN_ZERO(env, paint);
    163         return GraphicsJNI::getNativePaint(env, paint)->getColor();
    164     }
    165 
    166     static jint getAlpha(JNIEnv* env, jobject paint) {
    167         NPE_CHECK_RETURN_ZERO(env, paint);
    168         return GraphicsJNI::getNativePaint(env, paint)->getAlpha();
    169     }
    170 
    171     static void setColor(JNIEnv* env, jobject paint, jint color) {
    172         NPE_CHECK_RETURN_VOID(env, paint);
    173         GraphicsJNI::getNativePaint(env, paint)->setColor(color);
    174     }
    175 
    176     static void setAlpha(JNIEnv* env, jobject paint, jint a) {
    177         NPE_CHECK_RETURN_VOID(env, paint);
    178         GraphicsJNI::getNativePaint(env, paint)->setAlpha(a);
    179     }
    180 
    181     static jfloat getStrokeWidth(JNIEnv* env, jobject paint) {
    182         NPE_CHECK_RETURN_ZERO(env, paint);
    183         return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth());
    184     }
    185 
    186     static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) {
    187         NPE_CHECK_RETURN_VOID(env, paint);
    188         GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width));
    189     }
    190 
    191     static jfloat getStrokeMiter(JNIEnv* env, jobject paint) {
    192         NPE_CHECK_RETURN_ZERO(env, paint);
    193         return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter());
    194     }
    195 
    196     static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) {
    197         NPE_CHECK_RETURN_VOID(env, paint);
    198         GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter));
    199     }
    200 
    201     static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) {
    202         return obj->getStrokeCap();
    203     }
    204 
    205     static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) {
    206         obj->setStrokeCap(cap);
    207     }
    208 
    209     static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) {
    210         return obj->getStrokeJoin();
    211     }
    212 
    213     static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) {
    214         obj->setStrokeJoin(join);
    215     }
    216 
    217     static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) {
    218         return obj->getFillPath(*src, dst);
    219     }
    220 
    221     static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) {
    222         return obj->setShader(shader);
    223     }
    224 
    225     static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) {
    226         return obj->setColorFilter(filter);
    227     }
    228 
    229     static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) {
    230         return obj->setXfermode(xfermode);
    231     }
    232 
    233     static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) {
    234         return obj->setPathEffect(effect);
    235     }
    236 
    237     static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) {
    238         return obj->setMaskFilter(maskfilter);
    239     }
    240 
    241     static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) {
    242         return obj->setTypeface(typeface);
    243     }
    244 
    245     static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) {
    246         return obj->setRasterizer(rasterizer);
    247     }
    248 
    249     static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) {
    250         return obj->getTextAlign();
    251     }
    252 
    253     static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) {
    254         obj->setTextAlign(align);
    255     }
    256 
    257     static void setTextLocale(JNIEnv* env, jobject clazz, SkPaint* obj, jstring locale) {
    258         const char* localeArray = env->GetStringUTFChars(locale, NULL);
    259         SkString skLocale(localeArray);
    260         obj->setTextLocale(skLocale);
    261         env->ReleaseStringUTFChars(locale, localeArray);
    262     }
    263 
    264     static jfloat getTextSize(JNIEnv* env, jobject paint) {
    265         NPE_CHECK_RETURN_ZERO(env, paint);
    266         return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
    267     }
    268 
    269     static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) {
    270         NPE_CHECK_RETURN_VOID(env, paint);
    271         GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize));
    272     }
    273 
    274     static jfloat getTextScaleX(JNIEnv* env, jobject paint) {
    275         NPE_CHECK_RETURN_ZERO(env, paint);
    276         return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX());
    277     }
    278 
    279     static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) {
    280         NPE_CHECK_RETURN_VOID(env, paint);
    281         GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX));
    282     }
    283 
    284     static jfloat getTextSkewX(JNIEnv* env, jobject paint) {
    285         NPE_CHECK_RETURN_ZERO(env, paint);
    286         return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX());
    287     }
    288 
    289     static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) {
    290         NPE_CHECK_RETURN_VOID(env, paint);
    291         GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX));
    292     }
    293 
    294     static jfloat ascent(JNIEnv* env, jobject paint) {
    295         NPE_CHECK_RETURN_ZERO(env, paint);
    296         SkPaint::FontMetrics    metrics;
    297         (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
    298         return SkScalarToFloat(metrics.fAscent);
    299     }
    300 
    301     static jfloat descent(JNIEnv* env, jobject paint) {
    302         NPE_CHECK_RETURN_ZERO(env, paint);
    303         SkPaint::FontMetrics    metrics;
    304         (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
    305         return SkScalarToFloat(metrics.fDescent);
    306     }
    307 
    308     static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
    309         NPE_CHECK_RETURN_ZERO(env, paint);
    310         SkPaint::FontMetrics metrics;
    311         SkScalar             spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
    312 
    313         if (metricsObj) {
    314             SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
    315             env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop));
    316             env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent));
    317             env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent));
    318             env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom));
    319             env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading));
    320         }
    321         return SkScalarToFloat(spacing);
    322     }
    323 
    324     static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
    325         NPE_CHECK_RETURN_ZERO(env, paint);
    326         SkPaint::FontMetrics metrics;
    327 
    328         GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
    329         int ascent = SkScalarRound(metrics.fAscent);
    330         int descent = SkScalarRound(metrics.fDescent);
    331         int leading = SkScalarRound(metrics.fLeading);
    332 
    333         if (metricsObj) {
    334             SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
    335             env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
    336             env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
    337             env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
    338             env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
    339             env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
    340         }
    341         return descent - ascent + leading;
    342     }
    343 
    344     static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) {
    345         NPE_CHECK_RETURN_ZERO(env, jpaint);
    346         NPE_CHECK_RETURN_ZERO(env, text);
    347 
    348         size_t textLength = env->GetArrayLength(text);
    349         if ((index | count) < 0 || (size_t)(index + count) > textLength) {
    350             doThrowAIOOBE(env);
    351             return 0;
    352         }
    353         if (count == 0) {
    354             return 0;
    355         }
    356 
    357         SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    358         const jchar* textArray = env->GetCharArrayElements(text, NULL);
    359         jfloat result = 0;
    360 
    361         TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength,
    362                 paint->getFlags(), NULL /* dont need all advances */, &result);
    363 
    364         env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
    365         return result;
    366     }
    367 
    368     static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) {
    369         NPE_CHECK_RETURN_ZERO(env, jpaint);
    370         NPE_CHECK_RETURN_ZERO(env, text);
    371 
    372         size_t textLength = env->GetStringLength(text);
    373         int count = end - start;
    374         if ((start | count) < 0 || (size_t)end > textLength) {
    375             doThrowAIOOBE(env);
    376             return 0;
    377         }
    378         if (count == 0) {
    379             return 0;
    380         }
    381 
    382         const jchar* textArray = env->GetStringChars(text, NULL);
    383         SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    384         jfloat width = 0;
    385 
    386         TextLayout::getTextRunAdvances(paint, textArray, start, count, textLength,
    387                 paint->getFlags(), NULL /* dont need all advances */, &width);
    388 
    389         env->ReleaseStringChars(text, textArray);
    390         return width;
    391     }
    392 
    393     static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
    394         NPE_CHECK_RETURN_ZERO(env, jpaint);
    395         NPE_CHECK_RETURN_ZERO(env, text);
    396 
    397         size_t textLength = env->GetStringLength(text);
    398         if (textLength == 0) {
    399             return 0;
    400         }
    401 
    402         const jchar* textArray = env->GetStringChars(text, NULL);
    403         SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    404         jfloat width = 0;
    405 
    406         TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength,
    407                 paint->getFlags(), NULL /* dont need all advances */, &width);
    408 
    409         env->ReleaseStringChars(text, textArray);
    410         return width;
    411     }
    412 
    413     static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) {
    414         NPE_CHECK_RETURN_ZERO(env, paint);
    415         NPE_CHECK_RETURN_ZERO(env, text);
    416 
    417         if (count < 0 || !widths) {
    418             doThrowAIOOBE(env);
    419             return 0;
    420         }
    421         if (count == 0) {
    422             return 0;
    423         }
    424         size_t widthsLength = env->GetArrayLength(widths);
    425         if ((size_t)count > widthsLength) {
    426             doThrowAIOOBE(env);
    427             return 0;
    428         }
    429 
    430         AutoJavaFloatArray autoWidths(env, widths, count);
    431         jfloat* widthsArray = autoWidths.ptr();
    432 
    433         TextLayout::getTextRunAdvances(paint, text, 0, count, count,
    434                 paint->getFlags(), widthsArray, NULL /* dont need totalAdvance */);
    435 
    436         return count;
    437     }
    438 
    439     static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) {
    440         const jchar* textArray = env->GetCharArrayElements(text, NULL);
    441         count = dotextwidths(env, paint, textArray + index, count, widths);
    442         env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
    443                                       JNI_ABORT);
    444         return count;
    445     }
    446 
    447     static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
    448             int start, int end, jfloatArray widths) {
    449         const jchar* textArray = env->GetStringChars(text, NULL);
    450         int count = dotextwidths(env, paint, textArray + start, end - start, widths);
    451         env->ReleaseStringChars(text, textArray);
    452         return count;
    453     }
    454 
    455     static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count,
    456             jint contextCount, jint flags, jcharArray glyphs) {
    457         NPE_CHECK_RETURN_ZERO(env, paint);
    458         NPE_CHECK_RETURN_ZERO(env, text);
    459 
    460         if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) {
    461             doThrowAIOOBE(env);
    462             return 0;
    463         }
    464         if (count == 0) {
    465             return 0;
    466         }
    467         size_t glypthsLength = env->GetArrayLength(glyphs);
    468         if ((size_t)count > glypthsLength) {
    469             doThrowAIOOBE(env);
    470             return 0;
    471         }
    472 
    473         jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL);
    474 
    475         sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
    476                 text, start, count, contextCount, flags);
    477         const jchar* shapedGlyphs = value->getGlyphs();
    478         size_t glyphsCount = value->getGlyphsCount();
    479         memcpy(glyphsArray, shapedGlyphs, sizeof(jchar) * glyphsCount);
    480 
    481         env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT);
    482         return glyphsCount;
    483     }
    484 
    485     static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint,
    486             jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
    487             jcharArray glyphs) {
    488         const jchar* textArray = env->GetStringChars(text, NULL);
    489         int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart,
    490                 end - start, contextEnd - contextStart, flags, glyphs);
    491         env->ReleaseStringChars(text, textArray);
    492         return count;
    493     }
    494 
    495     static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text,
    496                                     jint start, jint count, jint contextCount, jint flags,
    497                                     jfloatArray advances, jint advancesIndex) {
    498         NPE_CHECK_RETURN_ZERO(env, paint);
    499         NPE_CHECK_RETURN_ZERO(env, text);
    500 
    501         if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
    502             doThrowAIOOBE(env);
    503             return 0;
    504         }
    505         if (count == 0) {
    506             return 0;
    507         }
    508         if (advances) {
    509             size_t advancesLength = env->GetArrayLength(advances);
    510             if ((size_t)count > advancesLength) {
    511                 doThrowAIOOBE(env);
    512                 return 0;
    513             }
    514         }
    515         jfloat advancesArray[count];
    516         jfloat totalAdvance = 0;
    517 
    518         TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags,
    519                                        advancesArray, &totalAdvance);
    520 
    521         if (advances != NULL) {
    522             env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
    523         }
    524         return totalAdvance;
    525     }
    526 
    527     static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text,
    528                                     jint start, jint count, jint contextCount, jint flags,
    529                                     jfloatArray advances, jint advancesIndex) {
    530         NPE_CHECK_RETURN_ZERO(env, paint);
    531         NPE_CHECK_RETURN_ZERO(env, text);
    532 
    533         if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) {
    534             doThrowAIOOBE(env);
    535             return 0;
    536         }
    537         if (count == 0) {
    538             return 0;
    539         }
    540         if (advances) {
    541             size_t advancesLength = env->GetArrayLength(advances);
    542             if ((size_t)count > advancesLength) {
    543                 doThrowAIOOBE(env);
    544                 return 0;
    545             }
    546         }
    547 
    548         jfloat advancesArray[count];
    549         jfloat totalAdvance = 0;
    550 
    551         TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags,
    552                                        advancesArray, totalAdvance);
    553 
    554         if (advances != NULL) {
    555             env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray);
    556         }
    557         return totalAdvance;
    558     }
    559 
    560     static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
    561             jcharArray text, jint index, jint count, jint contextIndex, jint contextCount,
    562             jint flags, jfloatArray advances, jint advancesIndex, jint reserved) {
    563         jchar* textArray = env->GetCharArrayElements(text, NULL);
    564         jfloat result = (reserved == 0) ?
    565                 doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex,
    566                         count, contextCount, flags, advances, advancesIndex) :
    567                 doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex,
    568                         count, contextCount, flags, advances, advancesIndex);
    569         env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
    570         return result;
    571     }
    572 
    573     static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint,
    574             jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags,
    575             jfloatArray advances, jint advancesIndex, jint reserved) {
    576         const jchar* textArray = env->GetStringChars(text, NULL);
    577         jfloat result = (reserved == 0) ?
    578                 doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart,
    579                         end - start, contextEnd - contextStart, flags, advances, advancesIndex) :
    580                 doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart,
    581                         end - start, contextEnd - contextStart, flags, advances, advancesIndex);
    582         env->ReleaseStringChars(text, textArray);
    583         return result;
    584     }
    585 
    586     static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start,
    587             jint count, jint flags, jint offset, jint opt) {
    588         jfloat scalarArray[count];
    589 
    590         TextLayout::getTextRunAdvances(paint, text, start, count, count, flags,
    591                 scalarArray, NULL /* dont need totalAdvance */);
    592 
    593         jint pos = offset - start;
    594         switch (opt) {
    595         case AFTER:
    596           if (pos < count) {
    597             pos += 1;
    598           }
    599           // fall through
    600         case AT_OR_AFTER:
    601           while (pos < count && scalarArray[pos] == 0) {
    602             ++pos;
    603           }
    604           break;
    605         case BEFORE:
    606           if (pos > 0) {
    607             --pos;
    608           }
    609           // fall through
    610         case AT_OR_BEFORE:
    611           while (pos > 0 && scalarArray[pos] == 0) {
    612             --pos;
    613           }
    614           break;
    615         case AT:
    616         default:
    617           if (scalarArray[pos] == 0) {
    618             pos = -1;
    619           }
    620           break;
    621         }
    622 
    623         if (pos != -1) {
    624           pos += start;
    625         }
    626 
    627         return pos;
    628     }
    629 
    630     static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text,
    631             jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) {
    632         jchar* textArray = env->GetCharArrayElements(text, NULL);
    633         jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags,
    634                 offset, cursorOpt);
    635         env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);
    636         return result;
    637     }
    638 
    639     static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text,
    640             jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) {
    641         const jchar* textArray = env->GetStringChars(text, NULL);
    642         jint result = doTextRunCursor(env, paint, textArray, contextStart,
    643                 contextEnd - contextStart, flags, offset, cursorOpt);
    644         env->ReleaseStringChars(text, textArray);
    645         return result;
    646     }
    647 
    648     static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count,
    649                             jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
    650         TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path);
    651     }
    652 
    653     static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
    654             jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) {
    655         const jchar* textArray = env->GetCharArrayElements(text, NULL);
    656         getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path);
    657         env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT);
    658     }
    659 
    660     static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags,
    661             jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) {
    662         const jchar* textArray = env->GetStringChars(text, NULL);
    663         getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path);
    664         env->ReleaseStringChars(text, textArray);
    665     }
    666 
    667     static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius,
    668                                jfloat dx, jfloat dy, int color) {
    669         NPE_CHECK_RETURN_VOID(env, jpaint);
    670 
    671         SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    672         if (radius <= 0) {
    673             paint->setLooper(NULL);
    674         }
    675         else {
    676             paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius),
    677                                                   SkFloatToScalar(dx),
    678                                                   SkFloatToScalar(dy),
    679                                                   (SkColor)color))->unref();
    680         }
    681     }
    682 
    683     static int breakText(JNIEnv* env, SkPaint& paint, const jchar text[],
    684                          int count, float maxWidth, jfloatArray jmeasured,
    685                          SkPaint::TextBufferDirection tbd) {
    686         sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
    687                 text, 0, count, count, paint.getFlags());
    688         if (value == NULL) {
    689             return 0;
    690         }
    691         SkScalar     measured;
    692         size_t       bytes = paint.breakText(value->getGlyphs(), value->getGlyphsCount() << 1,
    693                                    SkFloatToScalar(maxWidth), &measured, tbd);
    694         SkASSERT((bytes & 1) == 0);
    695 
    696         if (jmeasured && env->GetArrayLength(jmeasured) > 0) {
    697             AutoJavaFloatArray autoMeasured(env, jmeasured, 1);
    698             jfloat* array = autoMeasured.ptr();
    699             array[0] = SkScalarToFloat(measured);
    700         }
    701         return bytes >> 1;
    702     }
    703 
    704     static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext,
    705             int index, int count, float maxWidth, jfloatArray jmeasuredWidth) {
    706         NPE_CHECK_RETURN_ZERO(env, jpaint);
    707         NPE_CHECK_RETURN_ZERO(env, jtext);
    708 
    709         SkPaint::TextBufferDirection tbd;
    710         if (count < 0) {
    711             tbd = SkPaint::kBackward_TextBufferDirection;
    712             count = -count;
    713         }
    714         else {
    715             tbd = SkPaint::kForward_TextBufferDirection;
    716         }
    717 
    718         if ((index < 0) || (index + count > env->GetArrayLength(jtext))) {
    719             doThrowAIOOBE(env);
    720             return 0;
    721         }
    722 
    723         SkPaint*     paint = GraphicsJNI::getNativePaint(env, jpaint);
    724         const jchar* text = env->GetCharArrayElements(jtext, NULL);
    725         count = breakText(env, *paint, text + index, count, maxWidth,
    726                           jmeasuredWidth, tbd);
    727         env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text),
    728                                       JNI_ABORT);
    729         return count;
    730     }
    731 
    732     static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext,
    733                 bool forwards, float maxWidth, jfloatArray jmeasuredWidth) {
    734         NPE_CHECK_RETURN_ZERO(env, jpaint);
    735         NPE_CHECK_RETURN_ZERO(env, jtext);
    736 
    737         SkPaint::TextBufferDirection tbd = forwards ?
    738                                         SkPaint::kForward_TextBufferDirection :
    739                                         SkPaint::kBackward_TextBufferDirection;
    740 
    741         SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    742         int count = env->GetStringLength(jtext);
    743         const jchar* text = env->GetStringChars(jtext, NULL);
    744         count = breakText(env, *paint, text, count, maxWidth,
    745                           jmeasuredWidth, tbd);
    746         env->ReleaseStringChars(jtext, text);
    747         return count;
    748     }
    749 
    750     static void doTextBounds(JNIEnv* env, const jchar* text, int count,
    751                              jobject bounds, const SkPaint& paint)
    752     {
    753         SkRect  r;
    754         SkIRect ir;
    755 
    756         sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(&paint,
    757                 text, 0, count, count, paint.getFlags());
    758         if (value == NULL) {
    759             return;
    760         }
    761         paint.measureText(value->getGlyphs(), value->getGlyphsCount() << 1, &r);
    762         r.roundOut(&ir);
    763         GraphicsJNI::irect_to_jrect(ir, env, bounds);
    764     }
    765 
    766     static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint,
    767                                 jstring text, int start, int end, jobject bounds)
    768     {
    769         const jchar* textArray = env->GetStringChars(text, NULL);
    770         doTextBounds(env, textArray + start, end - start, bounds, *paint);
    771         env->ReleaseStringChars(text, textArray);
    772     }
    773 
    774     static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint,
    775                         jcharArray text, int index, int count, jobject bounds)
    776     {
    777         const jchar* textArray = env->GetCharArrayElements(text, NULL);
    778         doTextBounds(env, textArray + index, count, bounds, *paint);
    779         env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray),
    780                                       JNI_ABORT);
    781     }
    782 
    783 };
    784 
    785 static JNINativeMethod methods[] = {
    786     {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer},
    787     {"native_init","()I", (void*) SkPaintGlue::init},
    788     {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint},
    789     {"native_reset","(I)V", (void*) SkPaintGlue::reset},
    790     {"native_set","(II)V", (void*) SkPaintGlue::assign},
    791     {"getFlags","()I", (void*) SkPaintGlue::getFlags},
    792     {"setFlags","(I)V", (void*) SkPaintGlue::setFlags},
    793     {"getHinting","()I", (void*) SkPaintGlue::getHinting},
    794     {"setHinting","(I)V", (void*) SkPaintGlue::setHinting},
    795     {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias},
    796     {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText},
    797     {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText},
    798     {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText},
    799     {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText},
    800     {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText},
    801     {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap},
    802     {"setDither","(Z)V", (void*) SkPaintGlue::setDither},
    803     {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle},
    804     {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle},
    805     {"getColor","()I", (void*) SkPaintGlue::getColor},
    806     {"setColor","(I)V", (void*) SkPaintGlue::setColor},
    807     {"getAlpha","()I", (void*) SkPaintGlue::getAlpha},
    808     {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha},
    809     {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth},
    810     {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth},
    811     {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter},
    812     {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter},
    813     {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap},
    814     {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap},
    815     {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin},
    816     {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin},
    817     {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath},
    818     {"native_setShader","(II)I", (void*) SkPaintGlue::setShader},
    819     {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter},
    820     {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode},
    821     {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect},
    822     {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter},
    823     {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface},
    824     {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer},
    825     {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign},
    826     {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign},
    827     {"native_setTextLocale","(ILjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
    828     {"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
    829     {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
    830     {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},
    831     {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX},
    832     {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX},
    833     {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX},
    834     {"ascent","()F", (void*) SkPaintGlue::ascent},
    835     {"descent","()F", (void*) SkPaintGlue::descent},
    836     {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics},
    837     {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt},
    838     {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII},
    839     {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String},
    840     {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII},
    841     {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC},
    842     {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS},
    843     {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F},
    844     {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F},
    845     {"native_getTextRunAdvances","(I[CIIIII[FII)F",
    846         (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII},
    847     {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F",
    848         (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII},
    849 
    850 
    851     {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I",
    852         (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C},
    853     {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C},
    854     {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I",
    855         (void*) SkPaintGlue::getTextRunCursor__String},
    856     {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C},
    857     {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String},
    858     {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V",
    859                                         (void*) SkPaintGlue::getStringBounds },
    860     {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V",
    861                                     (void*) SkPaintGlue::getCharArrayBounds },
    862     {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer}
    863 };
    864 
    865 static jfieldID req_fieldID(jfieldID id) {
    866     SkASSERT(id);
    867     return id;
    868 }
    869 
    870 int register_android_graphics_Paint(JNIEnv* env) {
    871     gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics");
    872     SkASSERT(gFontMetrics_class);
    873     gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class);
    874 
    875     gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F"));
    876     gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F"));
    877     gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F"));
    878     gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F"));
    879     gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F"));
    880 
    881     gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt");
    882     SkASSERT(gFontMetricsInt_class);
    883     gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class);
    884 
    885     gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I"));
    886     gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I"));
    887     gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I"));
    888     gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I"));
    889     gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I"));
    890 
    891     int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods,
    892         sizeof(methods) / sizeof(methods[0]));
    893     return result;
    894 }
    895 
    896 }
    897