C++ SkImageDecoder::getFormat方法代码示例

bool SkImageDecoder::DecodeStream(SkStream* stream, SkBitmap* bm,
                          SkBitmap::Config pref, Mode mode, Format* format) {
    SkASSERT(stream);
    SkASSERT(bm);

    bool success = false;
    SkImageDecoder* codec = SkImageDecoder::Factory(stream);

    if (NULL != codec) {
        success = codec->decode(stream, bm, pref, mode);
        if (success && format) {
            *format = codec->getFormat();
        }
        delete codec;
    }
    return success;
}

bool SkImageDecoder::DecodeStream(SkStreamRewindable* stream, SkBitmap* bm, SkColorType pref,
                                  Mode mode, Format* format) {
    SkASSERT(stream);
    SkASSERT(bm);

    bool success = false;
    SkImageDecoder* codec = SkImageDecoder::Factory(stream);

    if (codec) {
        success = codec->decode(stream, bm, pref, mode) != kFailure;
        if (success && format) {
            *format = codec->getFormat();
            if (kUnknown_Format == *format) {
                if (stream->rewind()) {
                    *format = GetStreamFormat(stream);
                }
            }
        }
        delete codec;
    }
    return success;
}

/*
 * 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);
}

//.........这里部分代码省略.........

    // Only setup the decoder to be deleted after its stack-based, refcounted
    // components (allocators, peekers, etc) are declared. This prevents RefCnt
    // asserts from firing due to the order objects are deleted from the stack.
    SkAutoTDelete<SkImageDecoder> add(decoder);

    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");
    }

    SkBitmap decodingBitmap;
    if (!decoder->decode(stream, &decodingBitmap, prefConfig, decodeMode)) {
        return nullObjectReturn("decoder->decode returned false");
    }

    int scaledWidth = decodingBitmap.width();
    int scaledHeight = decodingBitmap.height();

    if (willScale && mode != SkImageDecoder::kDecodeBounds_Mode) {
        scaledWidth = int(scaledWidth * scale + 0.5f);
        scaledHeight = int(scaledHeight * scale + 0.5f);
    }

    // update options (if any)
    if (options != NULL) {
        env->SetIntField(options, gOptions_widthFieldID, scaledWidth);
        env->SetIntField(options, gOptions_heightFieldID, scaledHeight);
        env->SetObjectField(options, gOptions_mimeFieldID,
                getMimeTypeString(env, decoder->getFormat()));
    }

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

    jbyteArray ninePatchChunk = NULL;
    if (peeker.fPatch != NULL) {
        if (willScale) {
            scaleNinePatchChunk(peeker.fPatch, scale);
        }

        size_t ninePatchArraySize = peeker.fPatch->serializedSize();
        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
        if (ninePatchChunk == NULL) {
            return nullObjectReturn("ninePatchChunk == null");
        }

        jbyte* array = (jbyte*) env->GetPrimitiveArrayCritical(ninePatchChunk, NULL);
        if (array == NULL) {
            return nullObjectReturn("primitive array == null");
        }

        peeker.fPatch->serialize(array);
        env->ReleasePrimitiveArrayCritical(ninePatchChunk, array, 0);
    }

    jintArray layoutBounds = NULL;
    if (peeker.fLayoutBounds != NULL) {
        layoutBounds = env->NewIntArray(4);
        if (layoutBounds == NULL) {

/*
 * 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);
}

//.........这里部分代码省略.........
        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)) {
        return nullObjectReturn("decoder->decode returned false");
    }

    int scaledWidth = decoded->width();
    int scaledHeight = decoded->height();

    if (willScale && mode != SkImageDecoder::kDecodeBounds_Mode) {
        scaledWidth = int(scaledWidth * scale + 0.5f);
        scaledHeight = int(scaledHeight * scale + 0.5f);
    }

    // update options (if any)
    if (options != NULL) {
        env->SetIntField(options, gOptions_widthFieldID, scaledWidth);
        env->SetIntField(options, gOptions_heightFieldID, scaledHeight);
        env->SetObjectField(options, gOptions_mimeFieldID,
                            getMimeTypeString(env, decoder->getFormat()));
    }

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

    jbyteArray ninePatchChunk = NULL;
    if (peeker.fPatch != NULL) {
        if (willScale) {
            scaleNinePatchChunk(peeker.fPatch, scale);
        }

        size_t ninePatchArraySize = peeker.fPatch->serializedSize();
        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
        if (ninePatchChunk == NULL) {
            return nullObjectReturn("ninePatchChunk == null");
        }

        jbyte* array = (jbyte*) env->GetPrimitiveArrayCritical(ninePatchChunk, NULL);
        if (array == NULL) {
            return nullObjectReturn("primitive array == null");
        }

        peeker.fPatch->serialize(array);
        env->ReleasePrimitiveArrayCritical(ninePatchChunk, array, 0);
    }

    jintArray layoutBounds = NULL;
    if (peeker.fLayoutBounds != NULL) {
        layoutBounds = env->NewIntArray(4);
        if (layoutBounds == NULL) {

// 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.........

//.........这里部分代码省略.........

    // Only setup the decoder to be deleted after its stack-based, refcounted
    // components (allocators, peekers, etc) are declared. This prevents RefCnt
    // asserts from firing due to the order objects are deleted from the stack.
    SkAutoTDelete<SkImageDecoder> add(decoder);

    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");
    }

    SkBitmap decodingBitmap;
    if (!decoder->decode(stream, &decodingBitmap, prefColorType, decodeMode)) {
        return nullObjectReturn("decoder->decode returned false");
    }

    int scaledWidth = decodingBitmap.width();
    int scaledHeight = decodingBitmap.height();

    if (willScale && decodeMode != SkImageDecoder::kDecodeBounds_Mode) {
        scaledWidth = int(scaledWidth * scale + 0.5f);
        scaledHeight = int(scaledHeight * scale + 0.5f);
    }

    // update options (if any)
    if (options != NULL) {
        env->SetIntField(options, gOptions_widthFieldID, scaledWidth);
        env->SetIntField(options, gOptions_heightFieldID, scaledHeight);
        env->SetObjectField(options, gOptions_mimeFieldID,
                getMimeTypeString(env, decoder->getFormat()));
    }

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

    jbyteArray ninePatchChunk = NULL;
    if (peeker.mPatch != NULL) {
        if (willScale) {
            scaleNinePatchChunk(peeker.mPatch, scale, scaledWidth, scaledHeight);
        }

        size_t ninePatchArraySize = peeker.mPatch->serializedSize();
        ninePatchChunk = env->NewByteArray(ninePatchArraySize);
        if (ninePatchChunk == NULL) {
            return nullObjectReturn("ninePatchChunk == null");
        }

        jbyte* array = (jbyte*) env->GetPrimitiveArrayCritical(ninePatchChunk, NULL);
        if (array == NULL) {
            return nullObjectReturn("primitive array == null");
        }

        memcpy(array, peeker.mPatch, peeker.mPatchSize);
        env->ReleasePrimitiveArrayCritical(ninePatchChunk, array, 0);
    }

    jobject ninePatchInsets = NULL;
    if (peeker.mHasInsets) {
        ninePatchInsets = env->NewObject(gInsetStruct_class, gInsetStruct_constructorMethodID,
                peeker.mOpticalInsets[0], peeker.mOpticalInsets[1], peeker.mOpticalInsets[2], peeker.mOpticalInsets[3],

ECode CLargeBitmap::NativeDecodeRegion(
    /* [in] */ SkBitmapRegionDecoder* lbm,
    /* [in] */ Int32 startX,
    /* [in] */ Int32 startY,
    /* [in] */ Int32 width,
    /* [in] */ Int32 height,
    /* [in] */ IBitmapFactoryOptions* options,
    /* [out] */ IBitmap** bitmap)
{
    SkImageDecoder* decoder = lbm->getDecoder();
    Int32 sampleSize = 1;
    SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
    bool doDither = true;
    bool preferQualityOverSpeed = false;
    CBitmapFactoryOptions* optObj = (CBitmapFactoryOptions*)options;

    if (NULL != optObj) {
        sampleSize = optObj->mInSampleSize;
        // initialize these, in case we fail later on
        optObj->mOutWidth = -1;
        optObj->mOutHeight = -1;
        optObj->mOutMimeType = NULL;

        prefConfig = Graphics::GetNativeBitmapConfig(optObj->mInPreferredConfig);
        doDither = (bool)optObj->mInDither;
        preferQualityOverSpeed = (bool)optObj->mInPreferQualityOverSpeed;
    }

    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    SkBitmap* nativeBitmap = new SkBitmap;
    SkAutoTDelete<SkBitmap> adb(nativeBitmap);
    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 != optObj && optObj->mCancel) {
        *bitmap = NULL;
        return NOERROR;
    }

    SkIRect region;
    region.fLeft = startX;
    region.fTop = startY;
    region.fRight = startX + width;
    region.fBottom = startY + height;

    if (!lbm->decodeRegion(nativeBitmap, region, prefConfig, sampleSize)) {
        *bitmap = NULL;
        return NOERROR;
    }

    // update options (if any)
    if (NULL != optObj) {
        optObj->mOutWidth = nativeBitmap->width();
        optObj->mOutHeight = nativeBitmap->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?
        optObj->mOutMimeType = CBitmapFactory::GetMimeTypeString(decoder->getFormat());
    }

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

    SkPixelRef* pr;
    pr = nativeBitmap->pixelRef();
    // promise we will never change our pixels (great for sharing and pictures)
    pr->setImmutable();
    // now create the java bitmap
    return Graphics::CreateBitmap(nativeBitmap, FALSE, NULL, -1, bitmap);
}