CODEWITHSUNDEEP
javaandroidcanvasopengl-es
X6Entrepreneur
X6Entrepreneur

Reputation: 1001

Draw many pixel points android canvas or opengl?

I'm trying to implement my own mirroring protocol. I'm using websockets to retrieve a compressed pixels buffer. After I decompress this buffer I got a big array of position with color that I should display.

I'm using canvas with a for loop on a huge arraylist (2 millions elements) in onDraw like following :

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    for (int i = 0; i < this.pixelsList.size(); i++) { //SIZE = 2.073.600 pixels
        canvas.drawPoint(this.pixelsList.get(i).getPosition().x, this.pixelsList.get(i).getPosition().y, this.pixelsList.get(i).getPaint());
    }
}

I'm looking for an efficient way to display this huge packet. I was on OpenGL ES but I did not find any way to display one pixel in one position.. Maybe should I take a look with OpenCV ?

Upvotes: 1

Views: 238

Answers (1)

Sung
Sung

Reputation: 1066

Don't dereference each pixel address and use a texture in OpenGL. This might be the fastest way.

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture[texture_id].texture_width, texture[texture_id].texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixelsList);

or if it's frequently updated

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE,  **pixelsList**);

Upvotes: 1

Related Questions