Use the ActionScript BitmapData class to pass bitmaps between
the ActionScript side and Java side of your extension. The
FREBitmapData
class extends FREObject
with the following methods appropriate for handling bitmap data objects:
To change the bitmap data, call
acquire()
and
then get the pixel color data with the
getBits()
method.
The
getLineStride32()
method indicates how many
32-bit data are in each horizontal line. Although this value is
usually equal to the width of the bitmap, in some cases bitmap data
can be padded with extra, non-visible bytes. Each pixel in the bitmap
is a 32-bit value in ARGB format. After you have manipulated the
bitmap, release the bitmap data by calling
release()
.
Do not call any FREObject methods (of any object, not just the
acquired object) between the calls to
acquire()
and
release()
.
This prohibition is because other calls could, as a side effect,
execute code that invalidates the byte array object or its contents.
To indicate that the Java implementation has modified all or
part of the bitmap, invalidate a rectangle of the bitmap with the
invalidateRect()
function. The
x
and
y
parameters
are the coordinates of the rectangle to invalidate, relative to
the 0,0 coordinates which are the top, left corner of the bitmap.
The
width
and
height
fields are
the dimensions in pixels of the rectangle to invalidate.
You can create new FREBitmapData object with the static factory
method,
FREBitmapData.newBitmapData()
.
