C++ library for streaming images (png/jpg/bmp)
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Joshua Moerman 56aa19593f (committing very old stuff) Adds cmake support 5 years ago
ImageStreams.xcodeproj added a lib target 9 years ago
examples added a lib target 9 years ago
include (committing very old stuff) Adds png input stream (IIRC the height is wrongly read) 6 years ago
CMakeLists.txt (committing very old stuff) Adds cmake support 5 years ago
README.md added a lib target 9 years ago
dummy.cpp (committing very old stuff) Adds cmake support 5 years ago

README.md

ImageStreams

Motivation

Some time ago I had a project where I rendered something to a high quality buffer, which I wanted to export as a png. I used libpng++ for that, the downside was that this library allocated the image again (in a different format). But the only thing I wanted to do is convert my format to another format (pixel by pixel), so this allocation seemed redundant. That's why I wanted a image stream library.

Features

  • Output streams for bmp, png and jpg image files
  • Grayscale and color
  • Low memory usage (because it streams)
  • Easy to use

Usage

png::gray_ostream image(1024, 768, "test.png");
for(int y = 0; y < 768; ++y){
	for(int x = 0; x < 1024; ++x){
		image << png::gray_ostream::pixel(some_generator(x,y));
	}
}
// done, image is automatically saved (with RAII)

There are more examples in the main.cpp file.

Dependencies

For the png format libpng is required. For the jpg format libjpeg or libjpeg-turbo is required. The bmp format does not depend on anything, so you can output images without other libraries :D.

TODO

  • Make output iterators
  • Input streams (plus iterators)
  • Add alpha support (where possible)
  • Some interface for parameters (eg. jpg quality)
  • Add appropriate license
  • Really make it a library (ie. restructure directories)