Replace Texture with Solid Color

@testsubject wrote:

Is there any fast way (without using GetData/SetData) that I can any pixel where the alpha is non-zero with a solid color?
For example:

to:

I will need to be doing this to many small (32 x 32) textures, filling the entire screen.
I wrote a shader to do this, but it still seems too slow (drops to 15~20 fps).

Or, even better, if there is some way to determine if the mouse is over any opaque portion of a texture that has been drawn to the screen (while ignoring textures underneath it)?

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