native/graphics/jni/imagedecoder.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "aassetstreamadaptor.h"

 #include <android/asset_manager.h>
 #include <android/bitmap.h>
 #include <android/imagedecoder.h>
 #include <android/graphics/MimeType.h>
 #include <android/rect.h>
 #include <hwui/ImageDecoder.h>
 #include <log/log.h>
 #include <SkAndroidCodec.h>

 #include <fcntl.h>
 #include <optional>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

 using namespace android;

 int ResultToErrorCode(SkCodec::Result result) {
     switch (result) {
         case SkCodec::kIncompleteInput:
             return ANDROID_IMAGE_DECODER_INCOMPLETE;
         case SkCodec::kErrorInInput:
             return ANDROID_IMAGE_DECODER_ERROR;
         case SkCodec::kInvalidInput:
             return ANDROID_IMAGE_DECODER_INVALID_INPUT;
         case SkCodec::kCouldNotRewind:
             return ANDROID_IMAGE_DECODER_SEEK_ERROR;
         case SkCodec::kUnimplemented:
             return ANDROID_IMAGE_DECODER_UNSUPPORTED_FORMAT;
         case SkCodec::kInvalidConversion:
             return ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
         case SkCodec::kInvalidParameters:
             return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
         case SkCodec::kSuccess:
             return ANDROID_IMAGE_DECODER_SUCCESS;
         case SkCodec::kInvalidScale:
             return ANDROID_IMAGE_DECODER_INVALID_SCALE;
         case SkCodec::kInternalError:
             return ANDROID_IMAGE_DECODER_INTERNAL_ERROR;
     }
 }

 static int createFromStream(std::unique_ptr<SkStreamRewindable> stream, AImageDecoder** outDecoder) {
     SkCodec::Result result;
     auto codec = SkCodec::MakeFromStream(std::move(stream), &result, nullptr,
                                          SkCodec::SelectionPolicy::kPreferAnimation);
     auto androidCodec = SkAndroidCodec::MakeFromCodec(std::move(codec),
             SkAndroidCodec::ExifOrientationBehavior::kRespect);
     if (!androidCodec) {
         return ResultToErrorCode(result);
     }

     *outDecoder = reinterpret_cast<AImageDecoder*>(new ImageDecoder(std::move(androidCodec)));
     return ANDROID_IMAGE_DECODER_SUCCESS;
 }

 int AImageDecoder_createFromAAsset(AAsset* asset, AImageDecoder** outDecoder) {
     if (!asset || !outDecoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }
     *outDecoder = nullptr;

     auto stream = std::make_unique<AAssetStreamAdaptor>(asset);
     return createFromStream(std::move(stream), outDecoder);
 }

 static bool isSeekable(int descriptor) {
     return ::lseek64(descriptor, 0, SEEK_CUR) != -1;
 }

 int AImageDecoder_createFromFd(int fd, AImageDecoder** outDecoder) {
     if (fd <= 0 || !outDecoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     struct stat fdStat;
     if (fstat(fd, &fdStat) == -1) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     if (!isSeekable(fd)) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     // SkFILEStream will close its descriptor. Duplicate it so the client will
     // still be responsible for closing the original.
     int dupDescriptor = fcntl(fd, F_DUPFD_CLOEXEC, 0);
     FILE* file = fdopen(dupDescriptor, "r");
     if (!file) {
         close(dupDescriptor);
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     auto stream = std::unique_ptr<SkStreamRewindable>(new SkFILEStream(file));
     return createFromStream(std::move(stream), outDecoder);
 }

 int AImageDecoder_createFromBuffer(const void* buffer, size_t length,
                                    AImageDecoder** outDecoder) {
     if (!buffer || !length  || !outDecoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }
     *outDecoder = nullptr;

     // The client is expected to keep the buffer alive as long as the
     // AImageDecoder, so we do not need to copy the buffer.
     auto stream = std::unique_ptr<SkStreamRewindable>(
             new SkMemoryStream(buffer, length, false /* copyData */));
     return createFromStream(std::move(stream), outDecoder);
 }

 static ImageDecoder* toDecoder(AImageDecoder* d) {
     return reinterpret_cast<ImageDecoder*>(d);
 }

 // Note: This differs from the version in android_bitmap.cpp in that this
 // version returns kGray_8_SkColorType for ANDROID_BITMAP_FORMAT_A_8. SkCodec
 // allows decoding single channel images to gray, which Android then treats
 // as A_8/ALPHA_8.
 static SkColorType getColorType(AndroidBitmapFormat format) {
     switch (format) {
         case ANDROID_BITMAP_FORMAT_RGBA_8888:
             return kN32_SkColorType;
         case ANDROID_BITMAP_FORMAT_RGB_565:
             return kRGB_565_SkColorType;
         case ANDROID_BITMAP_FORMAT_RGBA_4444:
             return kARGB_4444_SkColorType;
         case ANDROID_BITMAP_FORMAT_A_8:
             return kGray_8_SkColorType;
         case ANDROID_BITMAP_FORMAT_RGBA_F16:
             return kRGBA_F16_SkColorType;
         default:
             return kUnknown_SkColorType;
     }
 }

 int AImageDecoder_setAndroidBitmapFormat(AImageDecoder* decoder, int32_t format) {
     if (!decoder || format < ANDROID_BITMAP_FORMAT_NONE
             || format > ANDROID_BITMAP_FORMAT_RGBA_F16) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }
     return toDecoder(decoder)->setOutColorType(getColorType((AndroidBitmapFormat) format))
             ? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
 }

 const AImageDecoderHeaderInfo* AImageDecoder_getHeaderInfo(const AImageDecoder* decoder) {
     return reinterpret_cast<const AImageDecoderHeaderInfo*>(decoder);
 }

 static const ImageDecoder* toDecoder(const AImageDecoderHeaderInfo* info) {
     return reinterpret_cast<const ImageDecoder*>(info);
 }

 int32_t AImageDecoderHeaderInfo_getWidth(const AImageDecoderHeaderInfo* info) {
     if (!info) {
         return 0;
     }
     return toDecoder(info)->mCodec->getInfo().width();
 }

 int32_t AImageDecoderHeaderInfo_getHeight(const AImageDecoderHeaderInfo* info) {
     if (!info) {
         return 0;
     }
     return toDecoder(info)->mCodec->getInfo().height();
 }

 const char* AImageDecoderHeaderInfo_getMimeType(const AImageDecoderHeaderInfo* info) {
     if (!info) {
         return nullptr;
     }
     return getMimeType(toDecoder(info)->mCodec->getEncodedFormat());
 }

 bool AImageDecoderHeaderInfo_isAnimated(const AImageDecoderHeaderInfo* info) {
     if (!info) {
         return false;
     }
     return toDecoder(info)->mCodec->codec()->getFrameCount() > 1;
 }

 // FIXME: Share with getFormat in android_bitmap.cpp?
 static AndroidBitmapFormat getFormat(SkColorType colorType) {
     switch (colorType) {
         case kN32_SkColorType:
             return ANDROID_BITMAP_FORMAT_RGBA_8888;
         case kRGB_565_SkColorType:
             return ANDROID_BITMAP_FORMAT_RGB_565;
         case kARGB_4444_SkColorType:
             return ANDROID_BITMAP_FORMAT_RGBA_4444;
         case kAlpha_8_SkColorType:
             return ANDROID_BITMAP_FORMAT_A_8;
         case kRGBA_F16_SkColorType:
             return ANDROID_BITMAP_FORMAT_RGBA_F16;
         default:
             return ANDROID_BITMAP_FORMAT_NONE;
     }
 }

 AndroidBitmapFormat AImageDecoderHeaderInfo_getAndroidBitmapFormat(
         const AImageDecoderHeaderInfo* info) {
     if (!info) {
         return ANDROID_BITMAP_FORMAT_NONE;
     }
     return getFormat(toDecoder(info)->mCodec->computeOutputColorType(kN32_SkColorType));
 }

 int AImageDecoderHeaderInfo_getAlphaFlags(const AImageDecoderHeaderInfo* info) {
     if (!info) {
         // FIXME: Better invalid?
         return -1;
     }
     switch (toDecoder(info)->mCodec->getInfo().alphaType()) {
         case kUnknown_SkAlphaType:
             LOG_ALWAYS_FATAL("Invalid alpha type");
             return -1;
         case kUnpremul_SkAlphaType:
             // fall through. premul is the default.
         case kPremul_SkAlphaType:
             return ANDROID_BITMAP_FLAGS_ALPHA_PREMUL;
         case kOpaque_SkAlphaType:
             return ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE;
     }
 }

 SkAlphaType toAlphaType(int androidBitmapFlags) {
     switch (androidBitmapFlags) {
         case ANDROID_BITMAP_FLAGS_ALPHA_PREMUL:
             return kPremul_SkAlphaType;
         case ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL:
             return kUnpremul_SkAlphaType;
         case ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE:
             return kOpaque_SkAlphaType;
         default:
             return kUnknown_SkAlphaType;
     }
 }

 int AImageDecoder_setAlphaFlags(AImageDecoder* decoder, int alphaFlag) {
     if (!decoder || alphaFlag < ANDROID_BITMAP_FLAGS_ALPHA_PREMUL
             || alphaFlag > ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     return toDecoder(decoder)->setOutAlphaType(toAlphaType(alphaFlag))
             ? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
 }

 int AImageDecoder_setTargetSize(AImageDecoder* decoder, int width, int height) {
     if (!decoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     return toDecoder(decoder)->setTargetSize(width, height)
             ? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_SCALE;
 }

 int AImageDecoder_setCrop(AImageDecoder* decoder, ARect crop) {
     if (!decoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     SkIRect cropIRect;
     cropIRect.setLTRB(crop.left, crop.top, crop.right, crop.bottom);
     SkIRect* cropPtr = cropIRect == SkIRect::MakeEmpty() ? nullptr : &cropIRect;
     return toDecoder(decoder)->setCropRect(cropPtr)
             ? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_BAD_PARAMETER;
 }


 size_t AImageDecoder_getMinimumStride(AImageDecoder* decoder) {
     if (!decoder) {
         return 0;
     }

     SkImageInfo info = toDecoder(decoder)->getOutputInfo();
     return info.minRowBytes();
 }

 int AImageDecoder_decodeImage(AImageDecoder* decoder,
                               void* pixels, size_t stride,
                               size_t size) {
     if (!decoder || !pixels || !stride) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     ImageDecoder* imageDecoder = toDecoder(decoder);

     const int height = imageDecoder->getOutputInfo().height();
     const size_t minStride = AImageDecoder_getMinimumStride(decoder);
     // If this calculation were to overflow, it would have been caught in
     // setTargetSize.
     if (stride < minStride || size < stride * (height - 1) + minStride) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
     }

     return ResultToErrorCode(imageDecoder->decode(pixels, stride));
 }

 void AImageDecoder_delete(AImageDecoder* decoder) {
     delete toDecoder(decoder);
 }
	/*
	* Copyright 2019 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "aassetstreamadaptor.h"

	#include <android/asset_manager.h>
	#include <android/bitmap.h>
	#include <android/imagedecoder.h>
	#include <android/graphics/MimeType.h>
	#include <android/rect.h>
	#include <hwui/ImageDecoder.h>
	#include <log/log.h>
	#include <SkAndroidCodec.h>

	#include <fcntl.h>
	#include <optional>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>

	using namespace android;

	int ResultToErrorCode(SkCodec::Result result) {
	switch (result) {
	case SkCodec::kIncompleteInput:
	return ANDROID_IMAGE_DECODER_INCOMPLETE;
	case SkCodec::kErrorInInput:
	return ANDROID_IMAGE_DECODER_ERROR;
	case SkCodec::kInvalidInput:
	return ANDROID_IMAGE_DECODER_INVALID_INPUT;
	case SkCodec::kCouldNotRewind:
	return ANDROID_IMAGE_DECODER_SEEK_ERROR;
	case SkCodec::kUnimplemented:
	return ANDROID_IMAGE_DECODER_UNSUPPORTED_FORMAT;
	case SkCodec::kInvalidConversion:
	return ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
	case SkCodec::kInvalidParameters:
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	case SkCodec::kSuccess:
	return ANDROID_IMAGE_DECODER_SUCCESS;
	case SkCodec::kInvalidScale:
	return ANDROID_IMAGE_DECODER_INVALID_SCALE;
	case SkCodec::kInternalError:
	return ANDROID_IMAGE_DECODER_INTERNAL_ERROR;
	}
	}

	static int createFromStream(std::unique_ptr<SkStreamRewindable> stream, AImageDecoder** outDecoder) {
	SkCodec::Result result;
	auto codec = SkCodec::MakeFromStream(std::move(stream), &result, nullptr,
	SkCodec::SelectionPolicy::kPreferAnimation);
	auto androidCodec = SkAndroidCodec::MakeFromCodec(std::move(codec),
	SkAndroidCodec::ExifOrientationBehavior::kRespect);
	if (!androidCodec) {
	return ResultToErrorCode(result);
	}

	outDecoder = reinterpret_cast<AImageDecoder>(new ImageDecoder(std::move(androidCodec)));
	return ANDROID_IMAGE_DECODER_SUCCESS;
	}

	int AImageDecoder_createFromAAsset(AAsset* asset, AImageDecoder** outDecoder) {
	if (!asset \|\| !outDecoder) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}
	*outDecoder = nullptr;

	auto stream = std::make_unique<AAssetStreamAdaptor>(asset);
	return createFromStream(std::move(stream), outDecoder);
	}

	static bool isSeekable(int descriptor) {
	return ::lseek64(descriptor, 0, SEEK_CUR) != -1;
	}

	int AImageDecoder_createFromFd(int fd, AImageDecoder** outDecoder) {
	if (fd <= 0 \|\| !outDecoder) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	struct stat fdStat;
	if (fstat(fd, &fdStat) == -1) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	if (!isSeekable(fd)) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	// SkFILEStream will close its descriptor. Duplicate it so the client will
	// still be responsible for closing the original.
	int dupDescriptor = fcntl(fd, F_DUPFD_CLOEXEC, 0);
	FILE* file = fdopen(dupDescriptor, "r");
	if (!file) {
	close(dupDescriptor);
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	auto stream = std::unique_ptr<SkStreamRewindable>(new SkFILEStream(file));
	return createFromStream(std::move(stream), outDecoder);
	}

	int AImageDecoder_createFromBuffer(const void* buffer, size_t length,
	AImageDecoder** outDecoder) {
	if (!buffer \|\| !length \|\| !outDecoder) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}
	*outDecoder = nullptr;

	// The client is expected to keep the buffer alive as long as the
	// AImageDecoder, so we do not need to copy the buffer.
	auto stream = std::unique_ptr<SkStreamRewindable>(
	new SkMemoryStream(buffer, length, false /* copyData */));
	return createFromStream(std::move(stream), outDecoder);
	}

	static ImageDecoder* toDecoder(AImageDecoder* d) {
	return reinterpret_cast<ImageDecoder*>(d);
	}

	// Note: This differs from the version in android_bitmap.cpp in that this
	// version returns kGray_8_SkColorType for ANDROID_BITMAP_FORMAT_A_8. SkCodec
	// allows decoding single channel images to gray, which Android then treats
	// as A_8/ALPHA_8.
	static SkColorType getColorType(AndroidBitmapFormat format) {
	switch (format) {
	case ANDROID_BITMAP_FORMAT_RGBA_8888:
	return kN32_SkColorType;
	case ANDROID_BITMAP_FORMAT_RGB_565:
	return kRGB_565_SkColorType;
	case ANDROID_BITMAP_FORMAT_RGBA_4444:
	return kARGB_4444_SkColorType;
	case ANDROID_BITMAP_FORMAT_A_8:
	return kGray_8_SkColorType;
	case ANDROID_BITMAP_FORMAT_RGBA_F16:
	return kRGBA_F16_SkColorType;
	default:
	return kUnknown_SkColorType;
	}
	}

	int AImageDecoder_setAndroidBitmapFormat(AImageDecoder* decoder, int32_t format) {
	if (!decoder \|\| format < ANDROID_BITMAP_FORMAT_NONE
	\|\| format > ANDROID_BITMAP_FORMAT_RGBA_F16) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}
	return toDecoder(decoder)->setOutColorType(getColorType((AndroidBitmapFormat) format))
	? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
	}

	const AImageDecoderHeaderInfo* AImageDecoder_getHeaderInfo(const AImageDecoder* decoder) {
	return reinterpret_cast<const AImageDecoderHeaderInfo*>(decoder);
	}

	static const ImageDecoder* toDecoder(const AImageDecoderHeaderInfo* info) {
	return reinterpret_cast<const ImageDecoder*>(info);
	}

	int32_t AImageDecoderHeaderInfo_getWidth(const AImageDecoderHeaderInfo* info) {
	if (!info) {
	return 0;
	}
	return toDecoder(info)->mCodec->getInfo().width();
	}

	int32_t AImageDecoderHeaderInfo_getHeight(const AImageDecoderHeaderInfo* info) {
	if (!info) {
	return 0;
	}
	return toDecoder(info)->mCodec->getInfo().height();
	}

	const char* AImageDecoderHeaderInfo_getMimeType(const AImageDecoderHeaderInfo* info) {
	if (!info) {
	return nullptr;
	}
	return getMimeType(toDecoder(info)->mCodec->getEncodedFormat());
	}

	bool AImageDecoderHeaderInfo_isAnimated(const AImageDecoderHeaderInfo* info) {
	if (!info) {
	return false;
	}
	return toDecoder(info)->mCodec->codec()->getFrameCount() > 1;
	}

	// FIXME: Share with getFormat in android_bitmap.cpp?
	static AndroidBitmapFormat getFormat(SkColorType colorType) {
	switch (colorType) {
	case kN32_SkColorType:
	return ANDROID_BITMAP_FORMAT_RGBA_8888;
	case kRGB_565_SkColorType:
	return ANDROID_BITMAP_FORMAT_RGB_565;
	case kARGB_4444_SkColorType:
	return ANDROID_BITMAP_FORMAT_RGBA_4444;
	case kAlpha_8_SkColorType:
	return ANDROID_BITMAP_FORMAT_A_8;
	case kRGBA_F16_SkColorType:
	return ANDROID_BITMAP_FORMAT_RGBA_F16;
	default:
	return ANDROID_BITMAP_FORMAT_NONE;
	}
	}

	AndroidBitmapFormat AImageDecoderHeaderInfo_getAndroidBitmapFormat(
	const AImageDecoderHeaderInfo* info) {
	if (!info) {
	return ANDROID_BITMAP_FORMAT_NONE;
	}
	return getFormat(toDecoder(info)->mCodec->computeOutputColorType(kN32_SkColorType));
	}

	int AImageDecoderHeaderInfo_getAlphaFlags(const AImageDecoderHeaderInfo* info) {
	if (!info) {
	// FIXME: Better invalid?
	return -1;
	}
	switch (toDecoder(info)->mCodec->getInfo().alphaType()) {
	case kUnknown_SkAlphaType:
	LOG_ALWAYS_FATAL("Invalid alpha type");
	return -1;
	case kUnpremul_SkAlphaType:
	// fall through. premul is the default.
	case kPremul_SkAlphaType:
	return ANDROID_BITMAP_FLAGS_ALPHA_PREMUL;
	case kOpaque_SkAlphaType:
	return ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE;
	}
	}

	SkAlphaType toAlphaType(int androidBitmapFlags) {
	switch (androidBitmapFlags) {
	case ANDROID_BITMAP_FLAGS_ALPHA_PREMUL:
	return kPremul_SkAlphaType;
	case ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL:
	return kUnpremul_SkAlphaType;
	case ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE:
	return kOpaque_SkAlphaType;
	default:
	return kUnknown_SkAlphaType;
	}
	}

	int AImageDecoder_setAlphaFlags(AImageDecoder* decoder, int alphaFlag) {
	if (!decoder \|\| alphaFlag < ANDROID_BITMAP_FLAGS_ALPHA_PREMUL
	\|\| alphaFlag > ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	return toDecoder(decoder)->setOutAlphaType(toAlphaType(alphaFlag))
	? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_CONVERSION;
	}

	int AImageDecoder_setTargetSize(AImageDecoder* decoder, int width, int height) {
	if (!decoder) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	return toDecoder(decoder)->setTargetSize(width, height)
	? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_SCALE;
	}

	int AImageDecoder_setCrop(AImageDecoder* decoder, ARect crop) {
	if (!decoder) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	SkIRect cropIRect;
	cropIRect.setLTRB(crop.left, crop.top, crop.right, crop.bottom);
	SkIRect* cropPtr = cropIRect == SkIRect::MakeEmpty() ? nullptr : &cropIRect;
	return toDecoder(decoder)->setCropRect(cropPtr)
	? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}


	size_t AImageDecoder_getMinimumStride(AImageDecoder* decoder) {
	if (!decoder) {
	return 0;
	}

	SkImageInfo info = toDecoder(decoder)->getOutputInfo();
	return info.minRowBytes();
	}

	int AImageDecoder_decodeImage(AImageDecoder* decoder,
	void* pixels, size_t stride,
	size_t size) {
	if (!decoder \|\| !pixels \|\| !stride) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	ImageDecoder* imageDecoder = toDecoder(decoder);

	const int height = imageDecoder->getOutputInfo().height();
	const size_t minStride = AImageDecoder_getMinimumStride(decoder);
	// If this calculation were to overflow, it would have been caught in
	// setTargetSize.
	if (stride < minStride \|\| size < stride * (height - 1) + minStride) {
	return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
	}

	return ResultToErrorCode(imageDecoder->decode(pixels, stride));
	}

	void AImageDecoder_delete(AImageDecoder* decoder) {
	delete toDecoder(decoder);
	}