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pmimage.go
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pmimage.go
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package main
import (
"errors"
"fmt"
"image"
"image/gif"
"os"
"github.com/nfnt/resize"
)
type PMImageCache struct {
Images map[string]image.Image
Gifs map[string]*PMGif
}
type PMGif struct {
Frames []image.Image
PreviousFrame int
}
func (imgCache *PMImageCache) LoadImage(fn string, width int, height int) error {
filename := fmt.Sprintf("images/%s", fn)
if _, err := os.Stat(filename); os.IsNotExist(err) {
fmt.Println(err)
errString := fmt.Sprintf("File %s does not exist in the images folder", fn)
err := errors.New(errString)
return err
}
imgfile, err := os.Open(filename)
if err != nil {
return err
}
defer imgfile.Close()
tmpImage, _, err := image.Decode(imgfile)
if err != nil {
return err
}
tmpImage = resize.Resize(uint(width), uint(height), tmpImage, resize.Lanczos3)
if imgCache.Images == nil {
imgCache.Images = make(map[string]image.Image)
}
imgCache.Images[fn] = tmpImage
return nil
}
func (imgCache *PMImageCache) LoadGif(fn string, s ScreenDetails) error {
filename := fmt.Sprintf("images/%s", fn)
if _, err := os.Stat(filename); os.IsNotExist(err) {
fmt.Println(err)
errString := fmt.Sprintf("File %s does not exist in the images folder", fn)
err := errors.New(errString)
return err
}
imgfile, err := os.Open(filename)
if err != nil {
return err
}
defer imgfile.Close()
gif_out, err := gif.DecodeAll(imgfile)
if err != nil {
return err
}
// Create the PMGif object in the map
if imgCache.Gifs == nil {
imgCache.Gifs = make(map[string]*PMGif)
}
var nextPMGif PMGif
nextPMGif.PreviousFrame = 0
for _, srcImage := range gif_out.Image {
nextPMGif.Frames = append(nextPMGif.Frames, srcImage)
}
fmt.Println(len(nextPMGif.Frames))
imgCache.Gifs[fn] = &nextPMGif
// TODO: Scale the image
return nil
}
func (imgCache *PMImageCache) GetImage(imageName string, width int, height int) (image.Image, error) {
if _, ok := imgCache.Images[imageName]; ok {
return imgCache.Images[imageName], nil
}
err := imgCache.LoadImage(imageName, width, height)
if err != nil {
return nil, err
}
return imgCache.Images[imageName], nil
}
func (imgCache *PMImageCache) GetGifFrame(imageName string, s ScreenDetails) (image.Image, error) {
if _, ok := imgCache.Gifs[imageName]; ok {
return imgCache.Gifs[imageName].GetNextFrame()
}
// Not yet cached - load in
err := imgCache.LoadGif(imageName, s)
if err != nil {
fmt.Println(err)
var blank image.Image
return blank, err
} else {
ret := imgCache.Gifs[imageName]
return ret.GetNextFrame()
}
}
func (gif *PMGif) GetNextFrame() (image.Image, error) {
gif.PreviousFrame += 1
if gif.PreviousFrame > len(gif.Frames)-1 {
gif.PreviousFrame = 0
return gif.Frames[0], nil
}
return gif.Frames[gif.PreviousFrame], nil
}