Creating images from pixel data in arrays
MIDP 1.0 allows to create blank images,
to copy existing images, or to decode images from a resource
representing a supported image file format such as PNG
(providing either the resource name as a string or the
resource data in an array). It does not
directly allow to create an image from pixel data in
an RGB or RGBA array.
A rather obvious approach to create an image from
pixel data in an array would be to create a mutable
image and call
once for each pixel. However, that would be rather inefficient
and it wouldn't work with transparency.
We can do much better if we use the one method
MIDP 1.0 offers for creating an image from data in memory. Since
this happens to expect the data in PNG format, we just have to
provide it in PNG format. This task is less formidable than it
may sound, because we only need to implement a
minimal PNG encoder.
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