95 lines
4.0 KiB
C++
95 lines
4.0 KiB
C++
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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ultrahdr/multipictureformat.h>
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#include <ultrahdr/jpegrutils.h>
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namespace android::ultrahdr {
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size_t calculateMpfSize() {
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return sizeof(kMpfSig) + // Signature
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kMpEndianSize + // Endianness
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sizeof(uint32_t) + // Index IFD Offset
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sizeof(uint16_t) + // Tag count
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kTagSerializedCount * kTagSize + // 3 tags at 12 bytes each
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sizeof(uint32_t) + // Attribute IFD offset
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kNumPictures * kMPEntrySize; // MP Entries for each image
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}
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sp<DataStruct> generateMpf(int primary_image_size, int primary_image_offset,
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int secondary_image_size, int secondary_image_offset) {
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size_t mpf_size = calculateMpfSize();
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sp<DataStruct> dataStruct = sp<DataStruct>::make(mpf_size);
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dataStruct->write(static_cast<const void*>(kMpfSig), sizeof(kMpfSig));
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#if USE_BIG_ENDIAN
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dataStruct->write(static_cast<const void*>(kMpBigEndian), kMpEndianSize);
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#else
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dataStruct->write(static_cast<const void*>(kMpLittleEndian), kMpEndianSize);
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#endif
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// Set the Index IFD offset be the position after the endianness value and this offset.
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constexpr uint32_t indexIfdOffset =
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static_cast<uint16_t>(kMpEndianSize + sizeof(kMpfSig));
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dataStruct->write32(Endian_SwapBE32(indexIfdOffset));
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// We will write 3 tags (version, number of images, MP entries).
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dataStruct->write16(Endian_SwapBE16(kTagSerializedCount));
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// Write the version tag.
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dataStruct->write16(Endian_SwapBE16(kVersionTag));
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dataStruct->write16(Endian_SwapBE16(kVersionType));
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dataStruct->write32(Endian_SwapBE32(kVersionCount));
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dataStruct->write(kVersionExpected, kVersionSize);
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// Write the number of images.
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dataStruct->write16(Endian_SwapBE16(kNumberOfImagesTag));
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dataStruct->write16(Endian_SwapBE16(kNumberOfImagesType));
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dataStruct->write32(Endian_SwapBE32(kNumberOfImagesCount));
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dataStruct->write32(Endian_SwapBE32(kNumPictures));
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// Write the MP entries.
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dataStruct->write16(Endian_SwapBE16(kMPEntryTag));
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dataStruct->write16(Endian_SwapBE16(kMPEntryType));
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dataStruct->write32(Endian_SwapBE32(kMPEntrySize * kNumPictures));
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const uint32_t mpEntryOffset =
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static_cast<uint32_t>(dataStruct->getBytesWritten() - // The bytes written so far
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sizeof(kMpfSig) + // Excluding the MPF signature
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sizeof(uint32_t) + // The 4 bytes for this offset
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sizeof(uint32_t)); // The 4 bytes for the attribute IFD offset.
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dataStruct->write32(Endian_SwapBE32(mpEntryOffset));
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// Write the attribute IFD offset (zero because we don't write it).
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dataStruct->write32(0);
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// Write the MP entries for primary image
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dataStruct->write32(
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Endian_SwapBE32(kMPEntryAttributeFormatJpeg | kMPEntryAttributeTypePrimary));
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dataStruct->write32(Endian_SwapBE32(primary_image_size));
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dataStruct->write32(Endian_SwapBE32(primary_image_offset));
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dataStruct->write16(0);
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dataStruct->write16(0);
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// Write the MP entries for secondary image
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dataStruct->write32(Endian_SwapBE32(kMPEntryAttributeFormatJpeg));
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dataStruct->write32(Endian_SwapBE32(secondary_image_size));
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dataStruct->write32(Endian_SwapBE32(secondary_image_offset));
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dataStruct->write16(0);
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dataStruct->write16(0);
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return dataStruct;
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}
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} // namespace android::ultrahdr
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