func generateMosaic(tag string, in image.Image, m *mosaicRecord) {
// First build a color palette.
log.Printf("Mosaic[%s] Create Palette...", m.ID)
p := mosaic.NewImagePalette(paletteSize)
if err := thumbs.PopulatePalette(tag, p); err != nil {
log.Printf("Failed to populate palette: %s", err)
if err := mosaics.SetStatus(m.ID, MosaicStatusFailed); err != nil {
log.Printf("Failed to set mosaic failed: %s", err)
}
return
}
log.Printf("Mosaic[%s] Create Palette Done with %d colors, %d images.", m.ID, p.NumColors(), p.NumImages())
// Update that the mosaic is being worked on.
if err := mosaics.SetStatus(m.ID, MosaicStatusWorking); err != nil {
log.Printf("Failed to set working status: %s", err)
return
}
// Generate the mosaic.
log.Printf("Mosaic[%s] Compose...", m.ID)
out := mosaic.ComposeSquare(in, Units, UnitSize, p)
log.Printf("Mosaic[%s] Compose Done.", m.ID)
// Store the image and update the the mosaic is done.
if err := mosaics.StoreImage(m.ID, out); err != nil {
log.Printf("Failed to store mosaic image: %s", err)
return
}
if err := mosaics.SetStatus(m.ID, MosaicStatusCreated); err != nil {
log.Printf("Failed to set mosaic created: %s", err)
return
}
}
func generateMosaic(src image.Image, tag string, units int, solid bool, inv *mosaic.ImageInventory) (image.Image, error) {
var p *mosaic.ImagePalette
if solid {
p = mosaic.NewSolidPalette(palette.WebSafe)
log.Printf("Generating %dx%d solid mosaic with %d colors", units, units, p.NumColors())
} else {
p = mosaic.NewImagePalette(paletteSize)
if err := inv.PopulatePalette(p); err != nil {
return nil, err
}
if p.NumColors() == 0 {
return nil, fmt.Errorf("No images are available")
}
log.Printf("Generating %dx%d %s mosaic with %d colors and %d images\n", units, units, tag, p.NumColors(), p.NumImages())
}
sq := mosaic.ComposeSquare(src, units, unitSize, p)
return mosaic.Shrink(sq, outDownsample), nil
}