image

type Dict struct {
	// Width is the width of the image in pixels.
	Width int

	// Height is the height of the image in pixels.
	Height int

	// ColorSpace is the color space in which image samples are specified.
	// It can be any type of color space except Pattern.
	ColorSpace color.Space

	// BitsPerComponent is the number of bits used to represent each color component.
	// The value must be 1, 2, 4, 8, or (from PDF 1.5) 16.
	BitsPerComponent int

	// Intent (optional) is the name of a color rendering intent to be used in rendering the image.
	Intent graphics.RenderingIntent

	// MaskImage (optional) determines which parts of the image are to be
	// painted.
	//
	// Only one of MaskImage or MaskColors may be specified.
	MaskImage *ImageMask

	// MaskColors (optional) is an array of colors used for color key masking.
	// When specified, image samples with colors falling within the defined ranges
	// will not be painted, allowing the background to show through (similar to
	// chroma-key/green screen effects).
	//
	// The array contains pairs of min/max values for each color component:
	// [min1, max1, min2, max2, ..., minN, maxN] where N is the number of color
	// components in the image's color space. Each value must be in the range
	// 0 to (2^BitsPerComponent - 1) and represents raw color values before
	// any Decode array processing.
	//
	// A pixel is masked if ALL of its color components fall within their
	// respective min/max ranges.
	//
	// Only one of MaskImage or MaskColors may be specified.
	MaskColors []uint16

	// Decode (optional) is an array of numbers describing how to map image
	// samples into the range of values appropriate for the image's color
	// space. The slice must have twice the number of color components
	// required by ColorSpace.
	Decode []float64

	// Interpolate indicates whether image interpolation should be performed by
	// a PDF processor.
	Interpolate bool

	// Alternates (optional) is an array of alternate image dictionaries for this image.
	Alternates []*Dict

	// Name is deprecated and should be left empty.
	// Only used in PDF 1.0 where it was the name used to reference the image
	// mask from within content streams.
	Name pdf.Name

	// Metadata (optional) is a metadata stream containing metadata for the image.
	Metadata *metadata.Stream

	// WriteData is a function that writes the image data to the provided writer.
	// The data should be written row by row, with each row containing
	// Width * ColorSpace.Channels() samples, each sample using BitsPerComponent bits.
	WriteData func(io.Writer) error
}

type Image interface {
	Bounds() Rectangle
	Subtype() pdf.Name
	pdf.Embedder[pdf.Unused]
}

type ImageMask struct {
	// Width is the width of the image mask in pixels.
	Width int

	// Height is the height of the image mask in pixels.
	Height int

	// WriteData is a function that writes the mask data to the provided writer.
	// The data should be written as a continuous bit stream, with each row
	// starting at a new byte boundary. 0 = opaque, 1 = transparent.
	WriteData func(io.Writer) error

	// Interpolate enables edge smoothing for the mask to reduce jagged
	// appearance in low-resolution stencil masks.
	Interpolate bool

	// Alternates (optional) is an array of alternate image dictionaries for this image.
	Alternates []*ImageMask

	// Name is deprecated and should be left empty.
	// Only used in PDF 1.0 where it was the name used to reference the image
	// from within content streams.
	Name pdf.Name

	// Metadata (optional) is a metadata stream containing metadata for the image.
	Metadata *metadata.Stream
}

type Indexed struct {
	Pix        []uint8
	Width      int
	Height     int
	ColorSpace color.Space
}

type PNG struct {
	Data image.Image

	// ColorSpace is the color space of the image.
	// If this is not set, the image will be embedded as a DeviceRGB image.
	ColorSpace color.Space
}

type PixelRow struct {
	// contains filtered or unexported fields
}

type Rectangle struct {
	XMin, YMin, XMax, YMax int
}