composite

type Options struct {
	// Page reference to a page object, that contains dimensions and margins
	Page Page

	// Rows the number of rows of frames to composite on one page
	Rows int

	// Cols the number of columns of frames to composite on one page
	Cols int

	// BGColor the background color to use for parts of the page not covered by a frame, black|white
	BGColor string

	// InputDir the directory containing all of the individual frames, it is assumed nothing
	// but frame images are in this directory
	InputDir string

	// OutputDir the directory where the final composite images will be written to
	OutputDir string

	// Line1Text the text to show in the cover page, the first line of the title
	Line1Text string

	// Line2Text the text to show in the cover page, the second line of the title
	Line2Text string

	// Identifier a string printed in the margin of each page to help identify the frames
	Identifier string

	// FontBytes bytes read in from a ttf file for the font to use on the front cover
	FontBytes []byte

	// ReversePages if true we print the last page first, useful if you are printing in order,
	// so you don't have to manually reverse the pages before cutting them
	ReversePages bool

	// ReverseFrames if true we print the last frame first, useful if you want the flip book to flip
	// from back to front, which can be easier to watch sometimes
	ReverseFrames bool

	// Cover if true a cover image is rendered
	Cover bool

	// GIF if true an animated GIF is generated from the individual frames
	GIF bool

	// SmallFrames if true half size versions of each frame are created in the output dir
	SmallFrames bool

	// Effect is the name of an image processing effect to apply to each frame, values are 'oil'
	Effect string

	// VerLog a logger that will receive verbose information
	VerLog *log.Logger
}

type Page struct {
	// Width of the page in inches
	Width float32

	// Height of the page in inches
	Height float32

	// MarginTop size of top margin in inches
	MarginTop float32

	// MarginRight size of right margin in inches
	MarginRight float32

	// MarginBottom size of bottom margin in inches
	MarginBottom float32

	// MarginLeft size of left margin in inches
	MarginLeft float32

	// DPI number of dots per inch e.g. 300
	DPI int
}

type RenderInfo struct {
	// NFrames the number of frames in the flip
	NFrames int

	// FrameAR the aspect ratio of the final frames
	FrameAR float64
}