v0.0.488 fix wpdf with 16bpp images

wpdf/wpdfImage.go

@@ -7,6 +7,7 @@ import (
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"image"
 	"image/color"
+	"image/draw"
 	"net/http"
 )
 
@@ -284,6 +285,13 @@ func (b *WPDFBuilder) Image(img *PDFImageRef, opts ...*PDFImageOpt) {
 			}
 		}
 
+		if dataimg.ColorModel() != color.RGBAModel && dataimg.ColorModel() != color.NRGBAModel {
+			// the image cannto be 16bpp or similar - otherwise fpdf errors out
+			dataImgRGBA := image.NewNRGBA(image.Rect(0, 0, dataimg.Bounds().Dx(), dataimg.Bounds().Dy()))
+			draw.Draw(dataImgRGBA, dataImgRGBA.Bounds(), dataimg, dataimg.Bounds().Min, draw.Src)
+			dataimg = dataImgRGBA
+		}
+
 		bfr, imgMime, err := imageext.EncodeImage(dataimg, compression)
 		if err != nil {
 			b.b.SetError(err)