giffer

Create .gif images from sites like youtube.com
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image.go (726B)

      1 package main
      2 
      3 import (
      4 	"image"
      5 	"image/color"
      6 )
      7 
      8 var _ image.Image = ImageStack{}
      9 
     10 // ImageStack implements image.Image as a stack of images that returns the first non-zero color
     11 // encountered.
     12 type ImageStack struct {
     13 	Stack  []image.Image
     14 	Config image.Config
     15 }
     16 
     17 func (stack ImageStack) At(x, y int) color.Color {
     18 	for _, img := range stack.Stack {
     19 		c := img.At(x, y)
     20 		if r, g, b, a := c.RGBA(); r > 0 || g > 0 || b > 0 || a > 0 {
     21 			return c
     22 		}
     23 	}
     24 	return color.NRGBA{}
     25 }
     26 
     27 func (stack ImageStack) Bounds() image.Rectangle {
     28 	return image.Rectangle{
     29 		Max: image.Point{
     30 			X: stack.Config.Width,
     31 			Y: stack.Config.Height,
     32 		},
     33 	}
     34 }
     35 
     36 func (stack ImageStack) ColorModel() color.Model {
     37 	return stack.Config.ColorModel
     38 }