doodle/pkg/wallpaper/texture.go

64 lines
1.6 KiB
Go

package wallpaper
// The methods that deal in cached Textures for Doodle.
import (
"errors"
"image"
"git.kirsle.net/go/render"
"git.kirsle.net/apps/doodle/pkg/shmem"
"git.kirsle.net/apps/doodle/pkg/userdir"
)
// CornerTexture returns the Texture.
func (wp *Wallpaper) CornerTexture(e render.Engine) (render.Texturer, error) {
if !wp.ready {
return nil, errors.New("wallpaper not ready")
}
if wp.tex.corner == nil {
tex, err := texture(e, wp.corner, wp.Name+"c")
wp.tex.corner = tex
return tex, err
}
return wp.tex.corner, nil
}
// TopTexture returns the Texture.
func (wp *Wallpaper) TopTexture(e render.Engine) (render.Texturer, error) {
if wp.tex.top == nil {
tex, err := texture(e, wp.top, wp.Name+"t")
wp.tex.top = tex
return tex, err
}
return wp.tex.top, nil
}
// LeftTexture returns the Texture.
func (wp *Wallpaper) LeftTexture(e render.Engine) (render.Texturer, error) {
if wp.tex.left == nil {
tex, err := texture(e, wp.left, wp.Name+"l")
wp.tex.left = tex
return tex, err
}
return wp.tex.left, nil
}
// RepeatTexture returns the Texture.
func (wp *Wallpaper) RepeatTexture(e render.Engine) (render.Texturer, error) {
if wp.tex.repeat == nil {
tex, err := texture(e, wp.repeat, wp.Name+"x")
wp.tex.repeat = tex
return tex, err
}
return wp.tex.repeat, nil
}
// texture creates or returns a cached texture for a wallpaper.
func texture(e render.Engine, img *image.RGBA, name string) (render.Texturer, error) {
filename := userdir.CacheFilename("wallpaper", name+".bmp")
texture, err := shmem.CurrentRenderEngine.StoreTexture(filename, img)
return texture, err
}