Daniel Henry Holmes Ingalls, Jr. is a former researcher of Xerox PARC, and a pioneer of object-oriented computer programming. He was the main architect, designer, and implementor of five generations of Smalltalk environments, including the first. He designed the byte-coded virtual machine that made Smalltalk practical in 1976, a variant of which is central to Java today. His major contributions to Squeak Smalltalk are the original concept of a Smalltalk written in itself and made portable and efficient by a Smalltalk-to-C translator. He also invented Bit blit (BitBlt), the general-purpose graphic operation that underlies most bitmap graphics systems today, and designed generalizations of it to arbitrary color depth, with built-in scaling, rotation, and anti-aliasing. He invented pop-up menus.
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- Daniel Henry Holmes Ingalls, Jr. Growing article, with links to related topics. Wikipedia.
- Dan Ingalls: Object-Oriented Programming Lecture video at Internet Archive. Open content.
- BitBLT Memo Untitled Xerox PARC interoffice memorandum. Bitsavers' PDF Document Archive.
- Weather Dimensions, Inc. Makes Weather On Display software: processes and displays realtime and historic local weather information from local sensors in accurate, intuitive manner. Runs on: Macintosh; Linux, Unix; Windows. For living room, lobby, or laboratory. Dan Ingalls' business.
- 2002 Dr. Dobb's Excellence in Programming Awards For those who, in a spirit of innovation and cooperation, make significant contributions to advancement of software development; to Adele Goldberg and Dan Ingalls as pioneers in object-oriented programming in general, and the Smalltalk language in particular.