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# encoding: UTF-8
module FreeImage
#DLL_API unsigned DLL_CALLCONV FreeImage_GetColorsUsed(FIBITMAP *dib);
attach_function('FreeImage_GetColorsUsed', [:pointer], :ulong)
#DLL_API RGBQUAD *DLL_CALLCONV FreeImage_GetPalette(FIBITMAP *dib);
attach_function('FreeImage_GetPalette', [:pointer], :pointer)
# Represents a bitmaps palette. If the bitmap doesn’t have a palette (i.e. when
# its pixel bit depth is greater than 8), this function returns nil.
class Palette
include Enumerable
def initialize(bitmap)
# Keep reference to bitmap so its not gc'ed
@bitmap = bitmap
end
# Returns the palette-size for palletised bitmaps, and 0 for high-colour bitmaps.
def size
result = FreeImage.FreeImage_GetColorsUsed(@bitmap)
FreeImage.check_last_error
result
end
alias :colors_used :size
# Returns the index color as an instance of FreeImage::RGBQuad
def [](index)
unless (0..self.size).include?(index)
raise(RangeError, "Value is out of range 0..#{self.size}. Value: #{index}")
end
ptr = FreeImage.FreeImage_GetPalette(@bitmap)
FreeImage.check_last_error
RGBQuad.new(ptr[index])
end
def each
size.times do |i|
yield (self[i])
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems