Re: [Flashcoders] Strange behaviour ByteArray to BitmapData object
Thank you. The position=0 seems to do the trick. I actually read over it
in the documentation. RTFM should be RTFMW(ell) !! :)
> Little tips if you want to test, instead of using setPixels to "fill"
> your Bitmap, using graphics.beginBitmapFill seems quicker and less CPU
> intensive (test it, I'm not 100% sure).
I dont actually want to render the bitmap. I make a black and white
images of a hand drawn sprite, that acts as a walkarea. Every room has a
different area and so i cache the ByteArray for every room. This
'bumpmap' is used to check, with getPixel() if a clicked position is on
the walkmap.
If I would render it to a graphics I will loose the getPixel() method
for checking. Also when i use the Loader.loadBytes.
Or am i wrong?
Jiri
Romuald Quantin wrote:
Did you try
myByteArray.position = 0
before reading it ?
You can try to use a Loader.loadBytes to instantiate a Bitmap (it uses a
loader but it takes no time).
Do you load the picture before storing the bytes?
If it is helping, I built a loader that is storing bytes for a cache
system and use Loader.loadBytes to instantiate the Bitmap:
http://www.soundstep.com/blog/downloads/somaloader/
To be sure your ByteArray is compressed, you can:
bytes.position = 0;
var compressed:uint = bytes.readUnsignedByte();
if (compressed == 0x43) trace("ByteArray is compressed!")
Little tips if you want to test, instead of using setPixels to "fill"
your Bitmap, using graphics.beginBitmapFill seems quicker and less CPU
intensive (test it, I'm not 100% sure).
Romu
Jiri wrote:
I came across some very weird behaviour and I can't seem to find an
explanation for it.
I am trying to write a class that will store compressed ByteArrays
that are retreive throught the bitmapData.getPixels.
Here is some testing code, that I wrote for the testing if a
decompressed ByteArray can be parsed back into an Bitmapdata object.
It all works well if the uncompress/compress block is in the code.
When i comment that code out, I get this error:
Could someone tell me what is happening here?
Error: Error #2030: End of file was encountered.
at flash.display::BitmapData/setPixels()
at GreyFilter_fla::MainTimeline/frame1()
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.geom.Point;
import flash.geom.Rectangle;
var destPoint:Point = new Point();
var source:Sprite = getChildByName('mcWalkArea') as Sprite;
var sourceRect:Rectangle = new Rectangle(0, 0, source.width,
source.height);
var a:BitmapData = new BitmapData(sourceRect.width, sourceRect.height);
var storedMapData:ByteArray;
a.draw( source );
//create a black and white area.
a.threshold(a, sourceRect, destPoint , "!=", 0x , 0xFF00 );
storedMapData = a.getPixels(sourceRect);
/* Try uncommenting this
trace(storedMapData.length);
storedMapData.compress()
trace(storedMapData.length);
storedMapData.uncompress()
trace(storedMapData.length);
*/
var tData:BitmapData = new BitmapData(sourceRect.width ,
sourceRect.height)
tData.setPixels( sourceRect , storedMapData );
var i:int = 0
while(i < source.width){
trace( tData.getPixel(i , 0 ) )
i++
}
Jiri
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Re: [Flashcoders] Strange behaviour ByteArray to BitmapData object
Did you try
myByteArray.position = 0
before reading it ?
You can try to use a Loader.loadBytes to instantiate a Bitmap (it uses a
loader but it takes no time).
Do you load the picture before storing the bytes?
If it is helping, I built a loader that is storing bytes for a cache
system and use Loader.loadBytes to instantiate the Bitmap:
http://www.soundstep.com/blog/downloads/somaloader/
To be sure your ByteArray is compressed, you can:
bytes.position = 0;
var compressed:uint = bytes.readUnsignedByte();
if (compressed == 0x43) trace("ByteArray is compressed!")
Little tips if you want to test, instead of using setPixels to "fill"
your Bitmap, using graphics.beginBitmapFill seems quicker and less CPU
intensive (test it, I'm not 100% sure).
Romu
Jiri wrote:
I came across some very weird behaviour and I can't seem to find an
explanation for it.
I am trying to write a class that will store compressed ByteArrays
that are retreive throught the bitmapData.getPixels.
Here is some testing code, that I wrote for the testing if a
decompressed ByteArray can be parsed back into an Bitmapdata object.
It all works well if the uncompress/compress block is in the code.
When i comment that code out, I get this error:
Could someone tell me what is happening here?
Error: Error #2030: End of file was encountered.
at flash.display::BitmapData/setPixels()
at GreyFilter_fla::MainTimeline/frame1()
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.geom.Point;
import flash.geom.Rectangle;
var destPoint:Point = new Point();
var source:Sprite = getChildByName('mcWalkArea') as Sprite;
var sourceRect:Rectangle = new Rectangle(0, 0, source.width,
source.height);
var a:BitmapData = new BitmapData(sourceRect.width, sourceRect.height);
var storedMapData:ByteArray;
a.draw( source );
//create a black and white area.
a.threshold(a, sourceRect, destPoint , "!=", 0x , 0xFF00 );
storedMapData = a.getPixels(sourceRect);
/* Try uncommenting this
trace(storedMapData.length);
storedMapData.compress()
trace(storedMapData.length);
storedMapData.uncompress()
trace(storedMapData.length);
*/
var tData:BitmapData = new BitmapData(sourceRect.width ,
sourceRect.height)
tData.setPixels( sourceRect , storedMapData );
var i:int = 0
while(i < source.width){
trace( tData.getPixel(i , 0 ) )
i++
}
Jiri
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[Flashcoders] Strange behaviour ByteArray to BitmapData object
I came across some very weird behaviour and I can't seem to find an
explanation for it.
I am trying to write a class that will store compressed ByteArrays that
are retreive throught the bitmapData.getPixels.
Here is some testing code, that I wrote for the testing if a
decompressed ByteArray can be parsed back into an Bitmapdata object.
It all works well if the uncompress/compress block is in the code. When
i comment that code out, I get this error:
Could someone tell me what is happening here?
Error: Error #2030: End of file was encountered.
at flash.display::BitmapData/setPixels()
at GreyFilter_fla::MainTimeline/frame1()
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.geom.Point;
import flash.geom.Rectangle;
var destPoint:Point = new Point();
var source:Sprite = getChildByName('mcWalkArea') as Sprite;
var sourceRect:Rectangle = new Rectangle(0, 0, source.width, source.height);
var a:BitmapData = new BitmapData(sourceRect.width, sourceRect.height);
var storedMapData:ByteArray;
a.draw( source );
//create a black and white area.
a.threshold(a, sourceRect, destPoint , "!=", 0x , 0xFF00 );
storedMapData = a.getPixels(sourceRect);
/* Try uncommenting this
trace(storedMapData.length);
storedMapData.compress()
trace(storedMapData.length);
storedMapData.uncompress()
trace(storedMapData.length);
*/
var tData:BitmapData = new BitmapData(sourceRect.width , sourceRect.height)
tData.setPixels( sourceRect , storedMapData );
var i:int = 0
while(i < source.width){
trace( tData.getPixel(i , 0 ) )
i++
}
Jiri
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