C++ SkImageDecoder::setDitherImage方法代码示例

bool SkImageRef::prepareBitmap(SkImageDecoder::Mode mode) {
    SkASSERT(&gImageRefMutex == this->mutex());

    if (fErrorInDecoding) {
        return false;
    }

    /*  As soon as we really know our config, we record it, so that on
        subsequent calls to the codec, we are sure we will always get the same
        result.
    */
    if (SkBitmap::kNo_Config != fBitmap.config()) {
        fConfig = fBitmap.config();
    }

    if (NULL != fBitmap.getPixels() ||
            (SkBitmap::kNo_Config != fBitmap.config() &&
             SkImageDecoder::kDecodeBounds_Mode == mode)) {
        return true;
    }

    SkASSERT(fBitmap.getPixels() == NULL);

    fStream->rewind();

    SkImageDecoder* codec;
    if (fFactory) {
        codec = fFactory->newDecoder(fStream);
    } else {
        codec = SkImageDecoder::Factory(fStream);
    }

    if (codec) {
        SkAutoTDelete<SkImageDecoder> ad(codec);

        codec->setSampleSize(fSampleSize);
        codec->setDitherImage(fDoDither);
        if (this->onDecode(codec, fStream, &fBitmap, fConfig, mode)) {
            return true;
        }
    }

#ifdef DUMP_IMAGEREF_LIFECYCLE
    if (NULL == codec) {
        SkDebugf("--- ImageRef: <%s> failed to find codec\n", this->getURI());
    } else {
        SkDebugf("--- ImageRef: <%s> failed in codec for %d mode\n",
                 this->getURI(), mode);
    }
#endif
    fErrorInDecoding = true;
    fBitmap.reset();
    return false;
}

bool SkImageRef::prepareBitmap(SkImageDecoder::Mode mode) {

    if (fErrorInDecoding) {
        return false;
    }

    if (NULL != fBitmap.getPixels() ||
            (SkBitmap::kNo_Config != fBitmap.config() &&
             SkImageDecoder::kDecodeBounds_Mode == mode)) {
        return true;
    }

    SkASSERT(fBitmap.getPixels() == NULL);

    if (!fStream->rewind()) {
        SkDEBUGF(("Failed to rewind SkImageRef stream!"));
        return false;
    }

    SkImageDecoder* codec;
    if (fFactory) {
        codec = fFactory->newDecoder(fStream);
    } else {
        codec = SkImageDecoder::Factory(fStream);
    }

    if (codec) {
        SkAutoTDelete<SkImageDecoder> ad(codec);

        codec->setSampleSize(fSampleSize);
        codec->setDitherImage(fDoDither);
        codec->setRequireUnpremultipliedColors(this->info().fAlphaType == kUnpremul_SkAlphaType);
        if (this->onDecode(codec, fStream, &fBitmap, fBitmap.config(), mode)) {
            if (kOpaque_SkAlphaType == fBitmap.alphaType()) {
                this->changeAlphaType(kOpaque_SkAlphaType);
            }
            SkASSERT(this->info() == fBitmap.info());
            return true;
        }
    }

#ifdef DUMP_IMAGEREF_LIFECYCLE
    if (NULL == codec) {
        SkDebugf("--- ImageRef: <%s> failed to find codec\n", this->getURI());
    } else {
        SkDebugf("--- ImageRef: <%s> failed in codec for %d mode\n",
                 this->getURI(), mode);
    }
#endif
    fErrorInDecoding = true;
    fBitmap.reset();
    return false;
}

bool MpoDecoder::decodeBounds()
{
    long bufferSize = mMP_Images[0]->getImageSize() + 2 + 2; //SOI + JPEG + EOI
    mMpoFileStream->rewind();
    if (false == mMpoFileStream->skip(mMP_Images[0]->getOffsetInFile()) ) {
        XLOGE("failed to jump to image data");
        return false;
    }

    char* jpegBuffer = (char*)malloc((unsigned int)bufferSize);
    if (NULL == jpegBuffer) {
        XLOGE("can not allocate memory to hold JPEG data");
        return false;
    }

    if (bufferSize != mMpoFileStream->read(jpegBuffer, bufferSize)) {
        free(jpegBuffer);
        XLOGE("read jpeg data failed");
        return false;
    }
    SkMemoryStream memStream(jpegBuffer, bufferSize);

    int sampleSize = 1;
    int preferSize = 0;
    bool doDither = true;

    SkBitmap* bitmap = new SkBitmap;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    SkImageDecoder::Mode decodeMode = SkImageDecoder::kDecodeBounds_Mode;
    SkImageDecoder* decoder = SkImageDecoder::Factory(&memStream);
    if (NULL == decoder) {
        XLOGE("SkImageDecoder-Factory() returned false");
        free(jpegBuffer);
        return false;
    }

    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    //decoder->setPreferSize(preferSize);

    if (!decoder->decode(&memStream, bitmap, prefConfig, decodeMode)) {
        XLOGE("SkImageDecoder-decode() returned false");
        free(jpegBuffer);
        return false;
    }
    //free memory buffer
    free(jpegBuffer);
    mWidth = bitmap->width();
    mHeight = bitmap->height();
    //delete created SkBitmap
    delete bitmap;
    return true;
}

	DecodeView() {
        SkFILEStream stream("/skimages/index.png");
        SkImageDecoder* codec = SkImageDecoder::Factory(&stream);
        if (codec) {
            for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); i++) {
                stream.rewind();
                codec->setDitherImage(gRec[i].fDither);
                codec->decode(&stream, &fBitmap[i], gRec[i].fPrefConfig,
                              SkImageDecoder::kDecodePixels_Mode);
            }
        }
    }

bool RenderSkinNinePatch::decodeAsset(AssetManager* am, const char* filename, NinePatch* ninepatch) {
    Asset* asset = am->open(filename, android::Asset::ACCESS_BUFFER);
    if (!asset) {
        asset = am->openNonAsset(filename, android::Asset::ACCESS_BUFFER);
        if (!asset) {
            return false;
        }
    }

    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    SkMemoryStream stream(asset->getBuffer(false), asset->getLength());
    SkImageDecoder* decoder = SkImageDecoder::Factory(&stream);
    if (!decoder) {
        asset->close();
        ALOGE("RenderSkinNinePatch::Failed to create an image decoder");
        return false;
    }

    decoder->setSampleSize(1);
    decoder->setDitherImage(true);
    decoder->setPreferQualityOverSpeed(false);

    NinePatchPeeker peeker(decoder);

    SkAutoTDelete<SkImageDecoder> add(decoder);

    decoder->setPeeker(&peeker);
    if (!decoder->decode(&stream, &ninepatch->m_bitmap, prefConfig, mode, true)) {
        asset->close();
        ALOGE("RenderSkinNinePatch::Failed to decode nine patch asset");
        return false;
    }

    asset->close();
    if (!peeker.fPatch) {
        ALOGE("RenderSkinNinePatch::Patch data not valid");
        return false;
    }
    void** data = &ninepatch->m_serializedPatchData;
    *data = malloc(peeker.fPatch->serializedSize());
    peeker.fPatch->serialize(*data);
    return true;
}

BitmapGlue*
BitmapFactoryGlue::doDecode(SkStream* stream, Options& options,
			    bool allowPurgeable, bool forcePurgeable)
{
	int sampleSize = 1;
	SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
	SkBitmap::Config prefConfig = SkBitmap::kARGB_8888_Config;
	bool doDither = true;
	bool isMutable = false;
	bool isPurgeable = forcePurgeable || (allowPurgeable && options.isPurgeable);
	BitmapGlue* javaBitmap = NULL;

	sampleSize = options.sampleSize;
	if (options.justDecodeBounds)
		mode = SkImageDecoder::kDecodeBounds_Mode;
	// initialize these, in case we fail later on
	options.width = -1;
	options.height = -1;

	prefConfig = options.config;
	isMutable = options.isMutable;
	doDither = options.doDither;
	javaBitmap = options.bitmap;

	SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
	if (NULL == decoder)
		return NULL;

	decoder->setSampleSize(sampleSize);
	decoder->setDitherImage(doDither);

	BitmapGlue* bitmap;
	if (javaBitmap == NULL) {
		bitmap = new BitmapGlue;
	} else {
		if (sampleSize != 1) {
			return NULL;
		}
		bitmap = javaBitmap;
		// config of supplied bitmap overrules config set in options
		prefConfig = bitmap->getConfig();
	}

	SkAutoTDelete<SkImageDecoder>   add(decoder);
	SkAutoTDelete<SkBitmap>         adb(bitmap, (javaBitmap == NULL));

	SkImageDecoder::Mode decodeMode = mode;
	if (isPurgeable) {
		decodeMode = SkImageDecoder::kDecodeBounds_Mode;
	}
	if (!decoder->decode(stream, bitmap, prefConfig, decodeMode))
		return NULL;

	// update options (if any)
	options.width = bitmap->width();
	options.height = bitmap->height();

	// if we're in justBounds mode, return now (skip the java bitmap)
	if (SkImageDecoder::kDecodeBounds_Mode == mode) {
		return NULL;
	}

	// detach bitmap from its autodeleter, since we want to own it now
	adb.detach();

	SkPixelRef* pr;
	if (isPurgeable) {
		pr = installPixelRef(bitmap, stream, sampleSize, doDither);
	} else {
		// if we get here, we're in kDecodePixels_Mode and will therefore
		// already have a pixelref installed.
		pr = bitmap->pixelRef();
	}

	if (!isMutable) {
		// promise we will never change our pixels (great for sharing and pictures)
		pr->setImmutable();
	}

	if (javaBitmap != NULL) {
		// If a java bitmap was passed in for reuse, pass it back
		return javaBitmap;
	}
	// now create the java bitmap
	return bitmap;
}

status_t BootAnimation::initTexture(const Animation::Frame& frame)
{
    //StopWatch watch("blah");

    SkBitmap bitmap;
    SkMemoryStream  stream(frame.map->getDataPtr(), frame.map->getDataLength());
    SkImageDecoder* codec = SkImageDecoder::Factory(&stream);
    if (codec) {
        codec->setDitherImage(false);
        codec->decode(&stream, &bitmap,
                SkBitmap::kARGB_8888_Config,
                SkImageDecoder::kDecodePixels_Mode);
        delete codec;
    }

    // FileMap memory is never released until application exit.
    // Release it now as the texture is already loaded and the memory used for
    // the packed resource can be released.
    frame.map->release();

    // ensure we can call getPixels(). No need to call unlock, since the
    // bitmap will go out of scope when we return from this method.
    bitmap.lockPixels();

    const int w = bitmap.width();
    const int h = bitmap.height();
    const void* p = bitmap.getPixels();

    GLint crop[4] = { 0, h, w, -h };
    int tw = 1 << (31 - __builtin_clz(w));
    int th = 1 << (31 - __builtin_clz(h));
    if (tw < w) tw <<= 1;
    if (th < h) th <<= 1;

    switch (bitmap.getConfig()) {
        case SkBitmap::kARGB_8888_Config:
            if (tw != w || th != h) {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tw, th, 0, GL_RGBA,
                        GL_UNSIGNED_BYTE, 0);
                glTexSubImage2D(GL_TEXTURE_2D, 0,
                        0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, p);
            } else {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tw, th, 0, GL_RGBA,
                        GL_UNSIGNED_BYTE, p);
            }
            break;

        case SkBitmap::kRGB_565_Config:
            if (tw != w || th != h) {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tw, th, 0, GL_RGB,
                        GL_UNSIGNED_SHORT_5_6_5, 0);
                glTexSubImage2D(GL_TEXTURE_2D, 0,
                        0, 0, w, h, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, p);
            } else {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tw, th, 0, GL_RGB,
                        GL_UNSIGNED_SHORT_5_6_5, p);
            }
            break;
        default:
            break;
    }

    glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, crop);

    return NO_ERROR;
}

/*
 * nine patch not supported
 *
 * purgeable not supported
 * reportSizeToVM not supported
 */
static jobject nativeDecodeRegion(JNIEnv* env, jobject, SkBitmapRegionDecoder *brd,
                                int start_x, int start_y, int width, int height, jobject options) {
    jobject tileBitmap = NULL;
    SkImageDecoder *decoder = brd->getDecoder();
    int sampleSize = 1;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    bool doDither = true;
    bool preferQualityOverSpeed = false;

    if (NULL != options) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
        // Get the bitmap for re-use if it exists.
        tileBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
    }

    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    AutoDecoderCancel   adc(options, decoder);

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (NULL != options && env->GetBooleanField(options, gOptions_mCancelID)) {
        return nullObjectReturn("gOptions_mCancelID");;
    }

    SkIRect region;
    region.fLeft = start_x;
    region.fTop = start_y;
    region.fRight = start_x + width;
    region.fBottom = start_y + height;
    SkBitmap* bitmap = NULL;
    SkTScopedPtr<SkBitmap> adb;

    if (tileBitmap != NULL) {
        // Re-use bitmap.
        bitmap = GraphicsJNI::getNativeBitmap(env, tileBitmap);
    }
    if (bitmap == NULL) {
        bitmap = new SkBitmap;
        adb.reset(bitmap);
    }

    if (!brd->decodeRegion(bitmap, region, prefConfig, sampleSize)) {
        return nullObjectReturn("decoder->decodeRegion returned false");
    }

    // update options (if any)
    if (NULL != options) {
        env->SetIntField(options, gOptions_widthFieldID, bitmap->width());
        env->SetIntField(options, gOptions_heightFieldID, bitmap->height());
        // TODO: set the mimeType field with the data from the codec.
        // but how to reuse a set of strings, rather than allocating new one
        // each time?
        env->SetObjectField(options, gOptions_mimeFieldID,
                            getMimeTypeString(env, decoder->getFormat()));
    }

    SkPixelRef* pr = bitmap->pixelRef();
    // promise we will never change our pixels (great for sharing and pictures)
    // pr->setImmutable();

    if(tileBitmap != NULL) {
      return tileBitmap;
    }

    // detach bitmap from its autodeleter, since we want to own it now
    adb.release();
    JavaPixelAllocator* allocator = (JavaPixelAllocator*) decoder->getAllocator();
    jbyteArray buff = allocator->getStorageObjAndReset();
    return GraphicsJNI::createBitmap(env, bitmap, buff, false, NULL, -1);
}

SkBitmap* MpoDecoder::decodeBuffer(JNIEnv* env, jobject options,
                                   SkStream* stream) {
    int sampleSize = 1;
    int preferSize = 0;
    int postproc = 0;
    int postprocflag = 0;
    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    bool doDither = true;
    bool isPurgeable = options != NULL &&
                       env->GetBooleanField(options, options_purgeableFieldID);

    if (NULL != options) {
        sampleSize = env->GetIntField(options, options_sampleSizeFieldID);
        //preferSize = env->GetIntField(options, options_preferSizeFieldID);
        //postproc = env->GetBooleanField(options, options_postprocFieldID);
        //postprocflag = env->GetIntField(options, options_postprocflagFieldID);
        if (env->GetBooleanField(options, options_justBoundsFieldID)) {
            mode = SkImageDecoder::kDecodeBounds_Mode;
        }
        // initialize these, in case we fail later on
        env->SetIntField(options, options_widthFieldID, -1);
        env->SetIntField(options, options_heightFieldID, -1);
        env->SetObjectField(options, options_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, options_configFieldID);
        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
        doDither = env->GetBooleanField(options, options_ditherFieldID);
    }

    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
    if (NULL == decoder) {
        XLOGE("SkImageDecoder-Factory() returned false");
        return NULL;
    }

    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    //decoder->setPreferSize(preferSize);
    //decoder->setPostProcFlag((postproc | (postprocflag << 4)));

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (NULL != options && env->GetBooleanField(options, options_mCancelID)) {
        XLOGE("Decoding is cancelled by requestCancelDecode");
        return NULL;
    }

    SkImageDecoder::Mode decodeMode = mode;
    if (isPurgeable) {
        decodeMode = SkImageDecoder::kDecodeBounds_Mode;
    }

    SkBitmap* bitmap = new SkBitmap;

    if (!decoder->decode(stream, bitmap, prefConfig, decodeMode)) {
        XLOGE("SkImageDecoder-decode() returned false");
        return NULL;
    }

    // update options (if any)
    if (NULL != options) {
        env->SetIntField(options, options_widthFieldID, bitmap->width());
        env->SetIntField(options, options_heightFieldID, bitmap->height());
        // TODO: set the mimeType field with the data from the codec.
        // but how to reuse a set of strings, rather than allocating new one
        // each time?
        env->SetObjectField(options, options_mimeFieldID,env->NewStringUTF("image/mpo"));
    }

    // if we're in justBounds mode, return now (skip the java bitmap)
    if (SkImageDecoder::kDecodeBounds_Mode == mode) {
        delete bitmap;
        return NULL;
    } else {
        return bitmap;
    }
}

status_t BootAnimation::initTexture(void* buffer, size_t len)
{
    //StopWatch watch("blah");

    SkBitmap bitmap;
    SkMemoryStream  stream(buffer, len);
    SkImageDecoder* codec = SkImageDecoder::Factory(&stream);
    codec->setDitherImage(false);
    if (codec) {
        codec->decode(&stream, &bitmap,
                SkBitmap::kRGB_565_Config,
                SkImageDecoder::kDecodePixels_Mode);
        delete codec;
    }

    // ensure we can call getPixels(). No need to call unlock, since the
    // bitmap will go out of scope when we return from this method.
    bitmap.lockPixels();

    const int w = bitmap.width();
    const int h = bitmap.height();
    const void* p = bitmap.getPixels();

    GLint crop[4] = { 0, h, w, -h };
    int tw = 1 << (31 - __builtin_clz(w));
    int th = 1 << (31 - __builtin_clz(h));
    if (tw < w) tw <<= 1;
    if (th < h) th <<= 1;

    switch (bitmap.getConfig()) {
        case SkBitmap::kARGB_8888_Config:
            if (tw != w || th != h) {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tw, th, 0, GL_RGBA,
                        GL_UNSIGNED_BYTE, 0);
                glTexSubImage2D(GL_TEXTURE_2D, 0,
                        0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, p);
            } else {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tw, th, 0, GL_RGBA,
                        GL_UNSIGNED_BYTE, p);
            }
            break;

        case SkBitmap::kRGB_565_Config:
            if (tw != w || th != h) {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tw, th, 0, GL_RGB,
                        GL_UNSIGNED_SHORT_5_6_5, 0);
                glTexSubImage2D(GL_TEXTURE_2D, 0,
                        0, 0, w, h, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, p);
            } else {
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tw, th, 0, GL_RGB,
                        GL_UNSIGNED_SHORT_5_6_5, p);
            }
            break;
        default:
            break;
    }

    glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, crop);

    return NO_ERROR;
}

// since we "may" create a purgeable imageref, we require the stream be ref'able
// i.e. dynamically allocated, since its lifetime may exceed the current stack
// frame.
static jobject doDecode(JNIEnv* env, SkStreamRewindable* stream, jobject padding,
        jobject options, bool allowPurgeable, bool forcePurgeable = false) {

    int sampleSize = 1;

    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
    SkBitmap::Config prefConfig = SkBitmap::kARGB_8888_Config;

    bool doDither = true;
    bool isMutable = false;
    float scale = 1.0f;
    bool isPurgeable = forcePurgeable || (allowPurgeable && optionsPurgeable(env, options));
    bool preferQualityOverSpeed = false;
    bool requireUnpremultiplied = false;

    jobject javaBitmap = NULL;

    if (options != NULL) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        if (optionsJustBounds(env, options)) {
            mode = SkImageDecoder::kDecodeBounds_Mode;
        }

        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
        isMutable = env->GetBooleanField(options, gOptions_mutableFieldID);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
        requireUnpremultiplied = !env->GetBooleanField(options, gOptions_premultipliedFieldID);
        javaBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);

        if (env->GetBooleanField(options, gOptions_scaledFieldID)) {
            const int density = env->GetIntField(options, gOptions_densityFieldID);
            const int targetDensity = env->GetIntField(options, gOptions_targetDensityFieldID);
            const int screenDensity = env->GetIntField(options, gOptions_screenDensityFieldID);
            if (density != 0 && targetDensity != 0 && density != screenDensity) {
                scale = (float) targetDensity / density;
            }
        }
    }

    const bool willScale = scale != 1.0f;
    isPurgeable &= !willScale;

    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
    if (decoder == NULL) {
        return nullObjectReturn("SkImageDecoder::Factory returned null");
    }

    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    decoder->setRequireUnpremultipliedColors(requireUnpremultiplied);

    SkBitmap* outputBitmap = NULL;
    unsigned int existingBufferSize = 0;
    if (javaBitmap != NULL) {
        outputBitmap = (SkBitmap*) env->GetIntField(javaBitmap, gBitmap_nativeBitmapFieldID);
        if (outputBitmap->isImmutable()) {
            ALOGW("Unable to reuse an immutable bitmap as an image decoder target.");
            javaBitmap = NULL;
            outputBitmap = NULL;
        } else {
            existingBufferSize = GraphicsJNI::getBitmapAllocationByteCount(env, javaBitmap);
        }
    }

    SkAutoTDelete<SkBitmap> adb(outputBitmap == NULL ? new SkBitmap : NULL);
    if (outputBitmap == NULL) outputBitmap = adb.get();

    NinePatchPeeker peeker(decoder);
    decoder->setPeeker(&peeker);

    SkImageDecoder::Mode decodeMode = isPurgeable ? SkImageDecoder::kDecodeBounds_Mode : mode;

    JavaPixelAllocator javaAllocator(env);
    RecyclingPixelAllocator recyclingAllocator(outputBitmap->pixelRef(), existingBufferSize);
    ScaleCheckingAllocator scaleCheckingAllocator(scale, existingBufferSize);
    SkBitmap::Allocator* outputAllocator = (javaBitmap != NULL) ?
            (SkBitmap::Allocator*)&recyclingAllocator : (SkBitmap::Allocator*)&javaAllocator;
    if (decodeMode != SkImageDecoder::kDecodeBounds_Mode) {
        if (!willScale) {
            // If the java allocator is being used to allocate the pixel memory, the decoder
            // need not write zeroes, since the memory is initialized to 0.
            decoder->setSkipWritingZeroes(outputAllocator == &javaAllocator);
            decoder->setAllocator(outputAllocator);
        } else if (javaBitmap != NULL) {
            // check for eventual scaled bounds at allocation time, so we don't decode the bitmap
            // only to find the scaled result too large to fit in the allocation
            decoder->setAllocator(&scaleCheckingAllocator);
        }
//.........这里部分代码省略.........

/*
 * nine patch not supported
 *
 * purgeable not supported
 * reportSizeToVM not supported
 */
static jobject nativeDecodeRegion(JNIEnv* env, jobject, jlong brdHandle,
                                jint start_x, jint start_y, jint width, jint height, jobject options) {
    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
    jobject tileBitmap = NULL;
    SkImageDecoder *decoder = brd->getDecoder();
    int sampleSize = 1;
    SkColorType prefColorType = kUnknown_SkColorType;
    bool doDither = true;
    bool preferQualityOverSpeed = false;
    bool requireUnpremultiplied = false;

    if (NULL != options) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefColorType = GraphicsJNI::getNativeBitmapColorType(env, jconfig);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
        // Get the bitmap for re-use if it exists.
        tileBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
        requireUnpremultiplied = !env->GetBooleanField(options, gOptions_premultipliedFieldID);
    }

    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    decoder->setRequireUnpremultipliedColors(requireUnpremultiplied);
    AutoDecoderCancel adc(options, decoder);

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (NULL != options && env->GetBooleanField(options, gOptions_mCancelID)) {
        return nullObjectReturn("gOptions_mCancelID");;
    }

    SkIRect region;
    region.fLeft = start_x;
    region.fTop = start_y;
    region.fRight = start_x + width;
    region.fBottom = start_y + height;
    SkBitmap* bitmap = NULL;
    SkAutoTDelete<SkBitmap> adb;

    if (tileBitmap != NULL) {
        // Re-use bitmap.
        bitmap = GraphicsJNI::getNativeBitmap(env, tileBitmap);
    }
    if (bitmap == NULL) {
        bitmap = new SkBitmap;
        adb.reset(bitmap);
    }

    if (!brd->decodeRegion(bitmap, region, prefColorType, sampleSize)) {
        return nullObjectReturn("decoder->decodeRegion returned false");
    }

    // update options (if any)
    if (NULL != options) {
        env->SetIntField(options, gOptions_widthFieldID, bitmap->width());
        env->SetIntField(options, gOptions_heightFieldID, bitmap->height());
        // TODO: set the mimeType field with the data from the codec.
        // but how to reuse a set of strings, rather than allocating new one
        // each time?
        env->SetObjectField(options, gOptions_mimeFieldID,
                            getMimeTypeString(env, decoder->getFormat()));
    }

    if (tileBitmap != NULL) {
        return tileBitmap;
    }

    // detach bitmap from its autodeleter, since we want to own it now
    adb.detach();

    JavaPixelAllocator* allocator = (JavaPixelAllocator*) decoder->getAllocator();
    jbyteArray buff = allocator->getStorageObjAndReset();

    int bitmapCreateFlags = 0;
    if (!requireUnpremultiplied) bitmapCreateFlags |= GraphicsJNI::kBitmapCreateFlag_Premultiplied;
    return GraphicsJNI::createBitmap(env, bitmap, buff, bitmapCreateFlags, NULL, NULL, -1);
}

// since we "may" create a purgeable imageref, we require the stream be ref'able
// i.e. dynamically allocated, since its lifetime may exceed the current stack
// frame.
static jobject doDecode(JNIEnv* env, SkStream* stream, jobject padding,
                        jobject options, bool allowPurgeable, bool forcePurgeable = false,
                        bool applyScale = false, float scale = 1.0f) {

    int sampleSize = 1;

    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
    SkBitmap::Config prefConfig = SkBitmap::kARGB_8888_Config;

    bool doDither = true;
    bool isMutable = false;
    bool willScale = applyScale && scale != 1.0f;
    bool isPurgeable = !willScale &&
                       (forcePurgeable || (allowPurgeable && optionsPurgeable(env, options)));
    bool preferQualityOverSpeed = false;

    jobject javaBitmap = NULL;

    if (options != NULL) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        if (optionsJustBounds(env, options)) {
            mode = SkImageDecoder::kDecodeBounds_Mode;
        }

        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
        isMutable = env->GetBooleanField(options, gOptions_mutableFieldID);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                                 gOptions_preferQualityOverSpeedFieldID);
        javaBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
    }

    if (willScale && javaBitmap != NULL) {
        return nullObjectReturn("Cannot pre-scale a reused bitmap");
    }

    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
    if (decoder == NULL) {
        return nullObjectReturn("SkImageDecoder::Factory returned null");
    }

    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);

    NinePatchPeeker peeker(decoder);
    JavaPixelAllocator javaAllocator(env);

    SkBitmap* bitmap;
    if (javaBitmap == NULL) {
        bitmap = new SkBitmap;
    } else {
        if (sampleSize != 1) {
            return nullObjectReturn("SkImageDecoder: Cannot reuse bitmap with sampleSize != 1");
        }
        bitmap = (SkBitmap*) env->GetIntField(javaBitmap, gBitmap_nativeBitmapFieldID);
        // config of supplied bitmap overrules config set in options
        prefConfig = bitmap->getConfig();
    }

    SkAutoTDelete<SkImageDecoder> add(decoder);
    SkAutoTDelete<SkBitmap> adb(bitmap, javaBitmap == NULL);

    decoder->setPeeker(&peeker);
    if (!isPurgeable) {
        decoder->setAllocator(&javaAllocator);
    }

    AutoDecoderCancel adc(options, decoder);

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (options != NULL && env->GetBooleanField(options, gOptions_mCancelID)) {
        return nullObjectReturn("gOptions_mCancelID");
    }

    SkImageDecoder::Mode decodeMode = mode;
    if (isPurgeable) {
        decodeMode = SkImageDecoder::kDecodeBounds_Mode;
    }

    SkBitmap* decoded;
    if (willScale) {
        decoded = new SkBitmap;
    } else {
        decoded = bitmap;
    }
    SkAutoTDelete<SkBitmap> adb2(willScale ? decoded : NULL);

    if (!decoder->decode(stream, decoded, prefConfig, decodeMode, javaBitmap != NULL)) {
//.........这里部分代码省略.........

// since we "may" create a purgeable imageref, we require the stream be ref'able
// i.e. dynamically allocated, since its lifetime may exceed the current stack
// frame.
static jobject doDecode(JNIEnv* env, SkStream* stream, jobject padding,
                        jobject options, bool allowPurgeable,
                        bool forcePurgeable = false) {
    int sampleSize = 1;
    SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    bool doDither = true;
    bool isPurgeable = forcePurgeable ||
                        (allowPurgeable && optionsPurgeable(env, options));
    bool reportSizeToVM = optionsReportSizeToVM(env, options);
    bool preferQualityOverSpeed = false;
    
    if (NULL != options) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        if (env->GetBooleanField(options, gOptions_justBoundsFieldID)) {
            mode = SkImageDecoder::kDecodeBounds_Mode;
        }
        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);
        
        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefConfig = GraphicsJNI::getNativeBitmapConfig(env, jconfig);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
    }

    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
    if (NULL == decoder) {
        return nullObjectReturn("SkImageDecoder::Factory returned null");
    }
    
    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);

    NinePatchPeeker     peeker(decoder);
    JavaPixelAllocator  javaAllocator(env, reportSizeToVM);
    SkBitmap*           bitmap = new SkBitmap;
    Res_png_9patch      dummy9Patch;

    SkAutoTDelete<SkImageDecoder>   add(decoder);
    SkAutoTDelete<SkBitmap>         adb(bitmap);

    decoder->setPeeker(&peeker);
    if (!isPurgeable) {
        decoder->setAllocator(&javaAllocator);
    }

    AutoDecoderCancel   adc(options, decoder);

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (NULL != options && env->GetBooleanField(options, gOptions_mCancelID)) {
        return nullObjectReturn("gOptions_mCancelID");;
    }

    SkImageDecoder::Mode decodeMode = mode;
    if (isPurgeable) {
        decodeMode = SkImageDecoder::kDecodeBounds_Mode;
    }
    if (!decoder->decode(stream, bitmap, prefConfig, decodeMode)) {
        return nullObjectReturn("decoder->decode returned false");
    }

    // update options (if any)
    if (NULL != options) {
        env->SetIntField(options, gOptions_widthFieldID, bitmap->width());
        env->SetIntField(options, gOptions_heightFieldID, bitmap->height());
        // TODO: set the mimeType field with the data from the codec.
        // but how to reuse a set of strings, rather than allocating new one
        // each time?
        env->SetObjectField(options, gOptions_mimeFieldID,
                            getMimeTypeString(env, decoder->getFormat()));
    }

    // if we're in justBounds mode, return now (skip the java bitmap)
    if (SkImageDecoder::kDecodeBounds_Mode == mode) {
        return NULL;
    }

    jbyteArray ninePatchChunk = NULL;
    if (peeker.fPatchIsValid) {
        size_t ninePatchArraySize = peeker.fPatch->serializedSize();
        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
        if (NULL == ninePatchChunk) {
            return nullObjectReturn("ninePatchChunk == null");
        }
        jbyte* array = (jbyte*)env->GetPrimitiveArrayCritical(ninePatchChunk,
                                                              NULL);
        if (NULL == array) {
            return nullObjectReturn("primitive array == null");
        }
        peeker.fPatch->serialize(array);
//.........这里部分代码省略.........

static jobject doDecode(JNIEnv* env, SkStreamRewindable* stream, jobject padding, jobject options) {

    int sampleSize = 1;
    int preferSize = 0;
    int postproc = 0;
    int postprocflag = 0;
#ifdef MTK_IMAGE_DC_SUPPORT
	void* dc;
	bool dcflag = false;
	jint* pdynamicCon = NULL;
	jintArray dynamicCon;
	jsize size = 0;
#endif

    SkImageDecoder::Mode decodeMode = SkImageDecoder::kDecodePixels_Mode;
    SkColorType prefColorType = kN32_SkColorType;

    bool doDither = true;
    bool isMutable = false;
    float scale = 1.0f;
    bool preferQualityOverSpeed = false;
    bool requireUnpremultiplied = false;

    jobject javaBitmap = NULL;

    if (options != NULL) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        if (optionsJustBounds(env, options)) {
            decodeMode = SkImageDecoder::kDecodeBounds_Mode;
        }

        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefColorType = GraphicsJNI::getNativeBitmapColorType(env, jconfig);
        isMutable = env->GetBooleanField(options, gOptions_mutableFieldID);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
        requireUnpremultiplied = !env->GetBooleanField(options, gOptions_premultipliedFieldID);
        javaBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
        postproc = env->GetBooleanField(options, gOptions_postprocFieldID);
        postprocflag = env->GetIntField(options, gOptions_postprocflagFieldID);

#ifdef MTK_IMAGE_DC_SUPPORT
		dcflag = env->GetBooleanField(options, gOptions_dynamicConflagFieldID);
		dynamicCon = (jintArray)env->GetObjectField(options, gOptions_dynamicConFieldID);
		//pdynamicCon = (unsigned int*)env->GetIntArrayElements(dynamicCon, 0);
		pdynamicCon = env->GetIntArrayElements(dynamicCon, NULL);
		size = env->GetArrayLength(dynamicCon);
		//for (int i=0; i<size; i++)
		//{
		   //ALOGD("pdynamicCon[%d]=%d", i, pdynamicCon[i]);
		//}

		//ALOGD("BitmapFactory.cpp postproc=%d, postprocflag=%d", postproc, postprocflag);
		//ALOGD("BitmapFactory.cpp dcflag=%d", dcflag);
		//ALOGD("BitmapFactory.cpp dynamicCon=%p", dynamicCon);
		//ALOGD("BitmapFactory.cpp size=%d", size);
#endif

        if (env->GetBooleanField(options, gOptions_scaledFieldID)) {
            const int density = env->GetIntField(options, gOptions_densityFieldID);
            const int targetDensity = env->GetIntField(options, gOptions_targetDensityFieldID);
            const int screenDensity = env->GetIntField(options, gOptions_screenDensityFieldID);
            if (density != 0 && targetDensity != 0 && density != screenDensity) {
                scale = (float) targetDensity / density;
            }
        }
    }

    const bool willScale = scale != 1.0f;

    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
    if (decoder == NULL) {
        return nullObjectReturn("SkImageDecoder::Factory returned null");
    }

    decoder->setSampleSize(sampleSize);
    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    decoder->setRequireUnpremultipliedColors(requireUnpremultiplied);
    decoder->setPreferSize(preferSize);
    decoder->setPostProcFlag((postproc | (postprocflag << 4)));

#ifdef MTK_IMAGE_DC_SUPPORT
    if (dcflag == true) {
	    dc= (void*)pdynamicCon;
	    int len = (int)size;
	    decoder->setDynamicCon(dc, len);
    } else {
        dc = NULL;
        decoder->setDynamicCon(dc, 0);
    }
//	(env)->ReleaseIntArrayElements(dynamicCon, pdynamicCon, 0);
#endif

//.........这里部分代码省略.........