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Note that this changes the behavior of tj3GetICCProfile() in the following ways: - It can now be called with a compression instance, thus allowing the caller to retrieve an ICC profile (or the size thereof) extracted from a PNG image by tj3LoadImage*(). - The ICC profile extracted from a JPEG image can now be retrieved multiple times. If I recall, I didn't allow this in TurboJPEG 3.1 because there were already two buffer copies, one in jpeg_read_icc_profile() and another in the JNI wrapper. That is no longer relevant, since the TurboJPEG Java API is now a separate project. These changes should be backward-compatible. Applications that treat tj3GetICCProfile() as a mailbox rather than a newsstand will still work. The changes were necessary in order to: - allow decompression programs to both extract the ICC profile from a JPEG image and embed it into a PNG output image, and - allow compression programs to retrieve the ICC profile size from a PNG input image (which is important when computing the worst-case JPEG destination buffer size.) Closes #645
