toPixelMap

ImageBitmapToPixelMapSample

/**
 * Sample showing how to obtain a [PixelMap] to query pixel information from an underlying
 * [ImageBitmap]
 */
fun ImageBitmapToPixelMapSample() {
    val imageBitmap = createImageBitmap()
    // Sample a 3 by 2 subsection of the given ImageBitmap
    // starting at the coordinate (48, 49)
    val pixelmap = imageBitmap.toPixelMap(startX = 48, startY = 49, width = 3, height = 2)
    // create a histogram to count the number of occurrences of a color within the specified
    // subsection of the provided ImageBitmap
    val histogram = HashMap<Color, Int>()
    for (x in 0 until pixelmap.width) {
        for (y in 0 until pixelmap.height) {
            val color = pixelmap[x, y]
            val colorCount = histogram[color] ?: 0
            histogram[color] = (colorCount + 1)
        }
    }
}