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Contents
module Ashton
# Used internally to create images from raw binary (blob) data.
#
# This object duck-types an RMagick image (#rows, #columns, #to_blob), so that Gosu will import it.
class ImageStub
# @return [Integer]
attr_reader :rows
# @return [Integer]
attr_reader :columns
# The first pixel in the blob will be at the top left hand corner of the created image, since that is the orientation
# of Gosu images.
#
# @param [String] blob_data Raw data string to import. Must be RGBA ordered, (4 * width * height) bytes in length.
# @param [Integer] width Number of pixels wide.
# @param [Integer] height Number of pixels high.
def initialize(blob_data, width, height)
raise ArgumentError, "Width must be >= 1 pixel" unless width > 0
raise ArgumentError, "Height must be >= 1 pixel" unless height > 0
expected_size = width * height * 4
raise ArgumentError, "Expected blob to be #{expected_size} bytes" unless blob_data.size == expected_size
@data, @columns, @rows = blob_data, width, height
end
# @return [String]
def to_blob
@data
end
end
end
Version data entries
11 entries across 11 versions & 2 rubygems