How To Display Blurred Bitmap Of Screenshot Using Opengl Es 2.0 On Android?

I am trying to create an app, in android using opengl es 2.0, that has a button on pressing which it would take the screenshot and would blurr it using any blur algo (here Fast blu

Solution 1:

The common method to display a full sized image is to use an orthogonal projection matrix:

(example using fixed functionality)

GLES20.glViewport(0, 0, windowWidth, windowHeight);
GLES20.glMatrixMode(GL_PROJECTION);
GLES20.glLoadIdentity();
GLES20.glOrtho(-1, 1, -1, 1, 1, -1);

than draw a fullscreen quad with your image bound as texture2D.

basic texture tutorial here.

basic quad tutorial here.

set quad coordinate as follow:

staticfloat squareCoords[] = {
        -1f, -1f, 0.0f,   // top left-1f, 1f, 0.0f,   // bottom left1f, 1f, 0.0f,   // bottom right1f, -1f, 0.0f }; // top right