| 610 | } |
| 611 | |
| 612 | LoaderTiff::LoaderTiff(PreviewId id, const Image& image, int parIdx) : |
| 613 | Loader(id, image), group_(param_[parIdx].group_) { |
| 614 | const ExifData& exifData = image_.exifData(); |
| 615 | |
| 616 | size_t offsetCount = 0; |
| 617 | ExifData::const_iterator pos; |
| 618 | |
| 619 | // check if the group_ contains a preview image |
| 620 | if (param_[parIdx].checkTag_) { |
| 621 | pos = exifData.findKey(ExifKey(param_[parIdx].checkTag_)); |
| 622 | if (pos == exifData.end()) |
| 623 | return; |
| 624 | if (param_[parIdx].checkValue_ && pos->toString() != param_[parIdx].checkValue_) |
| 625 | return; |
| 626 | } |
| 627 | |
| 628 | pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".StripOffsets")); |
| 629 | if (pos != exifData.end()) { |
| 630 | offsetTag_ = "StripOffsets"; |
| 631 | sizeTag_ = "StripByteCounts"; |
| 632 | offsetCount = pos->value().count(); |
| 633 | } else { |
| 634 | pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".TileOffsets")); |
| 635 | if (pos == exifData.end()) |
| 636 | return; |
| 637 | offsetTag_ = "TileOffsets"; |
| 638 | sizeTag_ = "TileByteCounts"; |
| 639 | offsetCount = pos->value().count(); |
| 640 | } |
| 641 | |
| 642 | pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + '.' + sizeTag_)); |
| 643 | if (pos == exifData.end()) |
| 644 | return; |
| 645 | if (offsetCount != pos->value().count()) |
| 646 | return; |
| 647 | for (size_t i = 0; i < offsetCount; i++) { |
| 648 | size_ += pos->toUint32(i); |
| 649 | } |
| 650 | |
| 651 | if (size_ == 0) |
| 652 | return; |
| 653 | |
| 654 | pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".ImageWidth")); |
| 655 | if (pos != exifData.end() && pos->count() > 0) { |
| 656 | width_ = pos->toUint32(); |
| 657 | } |
| 658 | |
| 659 | pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".ImageLength")); |
| 660 | if (pos != exifData.end() && pos->count() > 0) { |
| 661 | height_ = pos->toUint32(); |
| 662 | } |
| 663 | |
| 664 | if (width_ == 0 || height_ == 0) |
| 665 | return; |
| 666 | |
| 667 | valid_ = true; |
| 668 | } |
| 669 | |