Src bounds checking fails and Transform results in index out of range panics

[grokify]

What steps will reproduce the problem?

1. Compile the following program

package main

import "image"
import "graphics-go.googlecode.com/hg/graphics"

func main() {
    src := image.NewGray(image.Rect(50,50,60,60))
    dst := image.NewGray(image.Rect(0,0,100,100))
    graphics.I.Transform(dst, src)
}

2. Run it.

What is the expected output? What do you see instead?

Absolutely nothing. Instead I get:

panic: runtime error: index out of range

goroutine 1 [running]:
graphics-go%2egooglecode%2ecom/hg/graphics.binterpRGBA(0xf84001c870, 
0x3200000032, 0xf84001c570, 0x4049400000000000, 0x4049400000000000, ...)
    /Users/gunca/Code/go/src/pkg/graphics-go.googlecode.com/hg/graphics/bilinear.go:104 +0x5e4
graphics-go%2egooglecode%2ecom/hg/graphics.Affine.Transform(0x3ff0000000000000, 
0x0, 0x0, 0x0, 0x3ff0000000000000, ...)
    /Users/gunca/Code/go/src/pkg/graphics-go.googlecode.com/hg/graphics/affine.go:66 +0x348
main.main()
    /Users/gunca/Code/go-rotate/rotate.go:10 +0x144

What version of the product are you using? On what operating system?

hg identify -> d7322ae4d055+ weekly/weekly.2011-09-21
latest graphics-go on Snow Leopard

Copied from: https://code.google.com/archive/p/graphics-go/issues/1

[grokify]

No longer an issue with updated Transform() method:

func (a Affine) Transform(dst draw.Image, src image.Image, i interp.Interp) error

Example:

package main

import (
	"image"

	"github.com/grokify/graphics-go/graphics"
	"github.com/grokify/graphics-go/graphics/interp"
)

func main() {
	src := image.NewGray(image.Rect(50, 50, 60, 60))
	dst := image.NewGray(image.Rect(0, 0, 100, 100))
	graphics.I.Transform(dst, src, interp.Bilinear)
}