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General => SFML projects => Topic started by: LB on August 12, 2011, 01:16:02 am

Title: HQx Magnification Filter
Post by: LB on August 12, 2011, 01:16:02 am
This is a extension to apply the HQ2x/HQ3x/HQ4x algorithm with SFML images. The interface is pretty simple, with this methods:

Code: [Select]
namespace sfe {
  using namespace sf;
 
  // Initializes the HQx algorithm. Takes about one second and 64MB of RAM.
  // This is called automatically by the methods below, if necessary.
  inline void InitHQx();
 
  // Receives a sf::Image and returns a 2-times bigger sf::Image, using the
  // HQ2x magnification algorithm.
  Image HQ2x(const Image& input);
 
  // Receives a sf::Image and returns a 3-times bigger sf::Image, using the
  // HQ3x magnification algorithm.
  Image HQ3x(const Image& input);
 
  // Receives a sf::Image and returns a 4-times bigger sf::Image, using the
  // HQ4x magnification algorithm.
  Image HQ4x(const Image& input);
 
}

Here's a code sample:

Code: [Select]
#include <SFML/Graphics.hpp>
#include <SFE/HQx.cpp>

int main() {
  sf::Image img, hq2x, hq3x, hq4x;
  img.LoadFromFile("test.png");
 
  sfe::InitHQx(); // Unnecessary
 
  hq2x = sfe::HQ2x(img);
  hq2x.SaveToFile("hq2x.png");
 
  hq3x = sfe::HQ3x(img);
  hq3x.SaveToFile("hq3x.png");
 
  hq4x = sfe::HQ4x(img);
  hq4x.SaveToFile("hq4x.png");
 
  return 0;
}


Samples: (HQ3x)

(http://www.hiend3d.com/img/test_nn.gif)    (http://www.hiend3d.com/img/test_hq3x.gif)

(http://www.hiend3d.com/img/mailbox_nn.gif)    (http://www.hiend3d.com/img/mailbox_hq3x.gif)    (http://www.hiend3d.com/img/randam_nn3x.png)    (http://www.hiend3d.com/img/randam_hq3x.png)

This is my first open-source code. I got the HQx code from here (http://code.google.com/p/hqx/), and I did some modifications in it to make it working with 32-bit colors. Also, don't try to use it with images that has some pixel with alpha channel other than 255.

Download link: Click Here (http://dl.dropbox.com/u/18473445/SFML_HQx.zip)
Title: HQx Magnification Filter
Post by: Nexus on August 12, 2011, 01:47:21 am
Very nice! :)

I read the Wikipedia article about HQx some time ago, and I also had the idea to implement this algorithm in SFML. Up to now, I haven't had the time to do so. Don't you want to announce the project on the Wiki?

Unfortunately, your project doesn't compile on Visual Studio 2010.