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An approachable image processing library primarily based upon Vix and libvips that is NIF-based, fast, multi-threaded, pipelined and has a low memory footprint.
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lib/image/options/compose.ex
defmodule Image.Options.Compose do
@moduledoc false
# Thie module propvides functions to calculate
# x, y positions for compositions.
# Since x,y can be relateive or absolution, can be symbolid
# or numeric and can even by a function this becomse more
# complex that it might initially seem
@doc false
def get_x(image, prev_x, prev_width, x, dx, baseline) when is_function(x, 6) do
x = x.(image, prev_x, prev_width, x, dx, baseline)
get_x(image, prev_x, prev_width, x, dx, baseline)
end
def get_x(image, prev_x, prev_width, x, dx, baseline) when is_function(dx, 6) do
dx = x.(image, prev_x, prev_width, x, dx, baseline)
get_y(image, prev_x, prev_width, x, dx, baseline)
end
def get_x(_image, _prev_x, _prev_width, x, dx, _) when is_integer(x) and is_integer(dx) do
{:ok, x + dx}
end
# Centre align to image
def get_x(image, prev_x, prev_width, :center, dx, _) do
{:ok, prev_x + div(prev_width, 2) - div(Image.width(image), 2) + dx}
end
# Left align to iamge
def get_x(_image, prev_x, _prev_width, :left, dx, _) do
{:ok, prev_x + dx}
end
# Right align to image
def get_x(image, prev_x, prev_width, :right, dx, _) do
{:ok, prev_x + prev_width - Image.width(image) + dx}
end
# Offset from right edge of image
def get_x(_image, prev_x, prev_width, nil, dx, :right) do
{:ok, prev_x + prev_width + dx}
end
# Offset from left edge of image
def get_x(_image, prev_x, _prev_width, nil, dx, :left) do
{:ok, prev_x + dx}
end
# Default to right edge of image if no baseline
def get_x(image, prev_x, prev_width, nil, dx, nil) do
get_x(image, prev_x, prev_width, nil, dx, :left)
end
def get_x(_image, _prev_x, _prev_width, x, _dx, _baseline) do
{:error, "Invalid value for :x, found #{inspect x}"}
end
@doc false
def get_y(image, prev_y, prev_height, y, dy, baseline) when is_function(y, 6) do
y = y.(image, prev_y, prev_height, y, dy, baseline)
get_y(image, prev_y, prev_height, y, dy, baseline)
end
def get_y(image, prev_y, prev_height, y, dy, baseline) when is_function(dy, 6) do
dy = y.(image, prev_y, prev_height, y, dy, baseline)
get_y(image, prev_y, prev_height, y, dy, baseline)
end
def get_y(_image, _prev_y, _prev_width, y, dy, _) when is_integer(y) and is_integer(dy) do
{:ok, y + dy}
end
# Middle align to image
def get_y(image, prev_y, prev_height, :middle, dy, _) do
{:ok, prev_y + div(prev_height, 2) - div(Image.height(image), 2) + dy}
end
# Top align to iamge
def get_y(_image, prev_y, _prev_height, :top, dy, _) do
{:ok, prev_y + dy}
end
# Bottom align to image
def get_y(image, prev_y, prev_height, :bottom, dy, _) do
{:ok, prev_y + prev_height - Image.height(image) + dy}
end
# Offset from bottom edge of image
def get_y(_image, prev_y, prev_height, nil, dy, :bottom) do
{:ok, prev_y + prev_height + dy}
end
# Offset from top edge of image
def get_y(_image, prev_y, _prev_height, nil, dy, :top) do
{:ok, prev_y + dy}
end
# Default to bottom aligned
def get_y(image, prev_y, prev_height, nil, dy, nil) do
get_y(image, prev_y, prev_height, nil, dy, :bottom)
end
def get_y(_image, _prev_y, _prev_height, y, _dy, _baseline) do
{:error, "Invalid value for :y, found #{inspect y}"}
end
def default_composit_options do
%{
x: nil,
y: nil,
dx: 0,
dy: 0,
x_baseline: nil,
y_baseline: nil,
blend_mode: Image.BlendMode.default_blend_mode()
}
end
end