// SpriteMap returns a sprite from the passed glob and sprite
// parameters.
func SpriteMap(ctx *libsass.Context, usv libsass.UnionSassValue) libsass.UnionSassValue {
var glob string
var spacing libsass.SassNumber
err := libsass.Unmarshal(usv, &glob, &spacing)
if err != nil {
return libsass.Error(err)
}
imgs := sw.ImageList{
ImageDir: ctx.ImageDir,
BuildDir: ctx.BuildDir,
GenImgDir: ctx.GenImgDir,
}
imgs.Padding = int(spacing.Value)
if cglob, err := strconv.Unquote(glob); err == nil {
glob = cglob
}
key := glob + strconv.FormatInt(int64(spacing.Value), 10)
// TODO: benchmark a single write lock against this
// read lock then write lock
ctx.Sprites.RLock()
if _, ok := ctx.Sprites.M[key]; ok {
ctx.Sprites.RUnlock()
res, err := libsass.Marshal(key)
if err != nil {
return libsass.Error(err)
}
return res
}
ctx.Sprites.RUnlock()
err = imgs.Decode(glob)
if err != nil {
return libsass.Error(err)
}
_, err = imgs.Combine()
if err != nil {
return libsass.Error(err)
}
_, err = imgs.Export()
if err != nil {
return libsass.Error(err)
}
res, err := libsass.Marshal(key)
ctx.Sprites.Lock()
ctx.Sprites.M[key] = imgs
ctx.Sprites.Unlock()
if err != nil {
return libsass.Error(err)
}
return res
}
// ImageHeight takes a file path (or sprite glob) and returns the
// height in pixels of the image being referenced.
func ImageHeight(ctx *libsass.Context, usv libsass.UnionSassValue) libsass.UnionSassValue {
var (
glob string
name string
)
err := libsass.Unmarshal(usv, &name)
// Check for sprite-file override first
if err != nil {
var inf interface{}
var infs []interface{}
// Can't unmarshal to []interface{}, so unmarshal to
// interface{} then reflect it into a []interface{}
err = libsass.Unmarshal(usv, &inf)
k := reflect.ValueOf(&infs).Elem()
k.Set(reflect.ValueOf(inf))
if err != nil {
return libsass.Error(err)
}
glob = infs[0].(string)
name = infs[1].(string)
}
imgs := sw.ImageList{
ImageDir: ctx.ImageDir,
BuildDir: ctx.BuildDir,
GenImgDir: ctx.GenImgDir,
}
if glob == "" {
if hit, ok := ctx.Imgs.M[name]; ok {
imgs = hit
} else {
imgs.Decode(name)
imgs.Combine()
ctx.Imgs.Lock()
ctx.Imgs.M[name] = imgs
ctx.Imgs.Unlock()
}
} else {
ctx.Sprites.RLock()
imgs = ctx.Sprites.M[glob]
ctx.Sprites.RUnlock()
}
height := imgs.SImageHeight(name)
Hheight := libsass.SassNumber{
Value: float64(height),
Unit: "px",
}
res, err := libsass.Marshal(Hheight)
if err != nil {
fmt.Println(err)
}
return res
}
func testSprite(ctx *libsass.Context) {
// Generate test sprite
imgs := spritewell.ImageList{
ImageDir: ctx.ImageDir,
BuildDir: ctx.BuildDir,
GenImgDir: ctx.GenImgDir,
}
glob := "*.png"
err := imgs.Decode(glob)
if err != nil {
panic(err)
}
_, err = imgs.Combine()
if err != nil {
panic(err)
}
}