You want to create a mosaic-like effect?
Forget getPixel/setPixel/drawrect.. it'll be too slow. Instead, you
should let Flash handle it by creating new Bitmaps, shrinking the image
inside it, drawing that to a new bitmapdata, and then using that new
bitmapdata on the original size.
Zeh
Andrei Thomaz wrote:
hello list,
I am making some tests to discover if it is possibile to pixelize a bitmap
with AS3, with a reasonable speed. I wrote the code below, but it works only
with images until 50x50 (in a quadcore). You can see the effect
http://www.andreithomaz.com/labs/files/pixel/teste1.html.
I would like to ask you for advices about how I could optimize it. Or if I
just should try Java/C++.
thank you,
andrei
public dynamic class Teste1 extends MovieClip {
public var m_mcPicture:MovieClip;
public var m_sprScreen:Sprite;
private var m_tmTimer:Timer;
private var m_nPixel:int;
private var m_bDirection:Boolean;
private var m_bmpOriginalImage:BitmapData;
private var m_aPixels:ByteArray;
private var m_rcImageArea:Rectangle;
public function Teste1() {
m_rcImageArea = new Rectangle(0, 0, m_mcPicture.width,
m_mcPicture.height);
m_nPixel = 1;
m_bmpOriginalImage = new BitmapData( m_mcPicture.width,
m_mcPicture.height );
m_bmpOriginalImage.draw(m_mcPicture);
m_aPixels = m_bmpOriginalImage.getPixels(m_rcImageArea);
m_mcPicture.visible = false;
m_sprScreen = new Sprite();
addChild(m_sprScreen);
m_tmTimer = new Timer(2000);
m_tmTimer.addEventListener( TimerEvent.TIMER, _pixelizaImagem );
m_tmTimer.start();
m_bDirection = true;
}
private function _pixelizaImagem( evt:TimerEvent ):void
{
if (m_bDirection) {
++m_nPixel;
if (m_nPixel >= 50) {
m_bDirection = false;
}
}
else {
--m_nPixel;
if (m_nPixel <= 1) {
m_bDirection = true;
}
}
var nRows:int = Math.ceil( (m_mcPicture.height as Number) /
(m_nPixel as Number) );
var nCols:int = Math.ceil( (m_mcPicture.width as Number) /
(m_nPixel as Number) );
var i:int;
var j:int;
var k:int = 0;
var l:int = 0;
var m:int = 0;
var r:int, g:int, b:int;
var offset:int;
var offset2:int;
var aPixels:ByteArray = new ByteArray();
var nPixelsPerPixel;
var nLimitK:int = m_nPixel;
var nLimitL:int = m_nPixel;
for (i = 0; i < nRows; i++) {
if (i == (nRows - 1)) {
nLimitK = m_bmpOriginalImage.height - (i * m_nPixel);
}
else {
nLimitK = m_nPixel;
}
for (j = 0; j < nCols; j++) {
if (j == (nCols - 1)) {
nLimitL = m_bmpOriginalImage.width - (j * m_nPixel);
}
else {
nLimitL = m_nPixel;
}
offset = i * m_bmpOriginalImage.width * m_nPixel;
offset += (j * m_nPixel);
r = g = b = 0;
for (k = 0; k < nLimitK; k++) {
offset2 = (offset + (k * m_bmpOriginalImage.width) )
* 4;
for (l = 0; l < nLimitL; l++) {
r += m_aPixels[ offset2 + 1];
g += m_aPixels[ offset2 + 2 ];
b += m_aPixels[ offset2 + 3 ];
offset2 += 4;
}
}
nPixelsPerPixel = nLimitK * nLimitL;
r /= nPixelsPerPixel;
g /= nPixelsPerPixel;
b /= nPixelsPerPixel;
for (k = 0; k < nLimitK; k++) {
offset2 = (offset + (k * m_bmpOriginalImage.width) )
* 4;
for (l = 0; l < nLimitL; l++) {
aPixels[ offset2 ] = 255;
aPixels[ offset2 + 1 ] = r;
aPixels[ offset2 + 2 ] = g;
aPixels[ offset2 + 3 ] = b;
offset2 += 4;
}
}
}
}
var bmpPixelizedImage:BitmapData = new BitmapData(
m_bmpOriginalImage.width, m_bmpOriginalImage.height);
bmpPixelizedImage.setPixels(m_rcImageArea, aPixels);
m_sprScreen.graphics.beginBitmapFill(bmpPixelizedImage);
m_sprScreen.graphics.moveTo(0, 0);
m_sprScreen.graphics.lineTo(bmpPixelizedImage.width, 0);
m_sprScreen.graphics.lineTo(bmpPixelizedImage.width,
bmpPixelizedImage.height);
m_sprScreen.graphics.lineTo(0, bmpPixelizedImage.height);
m_sprScreen.graphics.lineTo(0, 0);
m_sprScreen.graphics.endFill();
}
}
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