Masking in SFML 2

[posva]

Hi, i'm wondering how to mask in SFML 2. I know that someone added a topic to the wiki for SFML 1.6 but i suppose that now that we have RenderImages we can do it with BlendModes, i cannot achieve it though...
I have being trying for a few hours now and stills doesn't work properly. I tried with many techniques but nothing...
The last one i tried was to have the sprite (lready masked) drawn to a black rectangle and then draw that rectangle with blend Add into a transparent surface but it doesn't work it about the same img.
Here is my code so far:

Code: [Select]


mask_img.Create(640,480);
    effects_img.Create(640, 480);
    light_img.Create(640, 480);
    inter_img.Create(640, 480);
mask_img.Clear(sf::Color(0,0,0,255));
    effects_img.Clear(sf::Color(0,0,0,0));
    light_img.Clear(sf::Color(0,0,0,255));

{...}

light_img.Draw(BloodHit::sprBlood[0]);
    spr_mask.SetBlendMode(sf::Blend::Multiply);
    light_img.Draw(spr_mask);
    light_img.Display();
    spr_inter.SetImage(light_img.GetImage());
    spr_inter.SetBlendMode(sf::Blend::Add);
   
    inter_img.Clear(sf::Color(0,0,0,0));

    //inter_img.Draw(sf::Shape::Rectangle(420, 340, 8, 8, sf::Color::White));
    inter_img.Draw(spr_inter);
    inter_img.Display();

This is why I think the substract blendmode should be added xD, to make masking easier. ( I already read some topics about adding BlendModes)

Thanks

[section_two]

sf::Image Class

void    CreateMaskFromColor (const Color &color, Uint8 alpha=0)
    Create a transparency mask from a specified colorkey.

[posva]

sf::Image Class

void    CreateMaskFromColor (const Color &color, Uint8 alpha=0)
    Create a transparency mask from a specified colorkey.

This is for Images ^^ I use RenderImage and i cannot apply that to a const sf:Image. try it ^^

[section_two]

sf::Image myImage(myRenderImage.GetImage());

or

myRenderImage.Create(100,50);
const sf::Uint8* ptr = myRenderImage.GetImage().GetPixelsPtr();
sf::Image myImage;
myImage.LoadFromPixels(100,50,ptr);

I did't test this.

[posva]

sf::Image myImage(myRenderImage.GetImage());

or

myRenderImage.Create(100,50);
const sf::Uint8* ptr = myRenderImage.GetImage().GetPixelsPtr();
sf::Image myImage;
myImage.LoadFromPixels(100,50,ptr);

I did't test this.

I know these ways, but they are really slow since you're creating a new Image and copying the content of an other image into it. What i do is done even more that 3 times in a step and must be fast enough, this is why i want to use blendmodes