[magick-developers] Interpolate always BilinearInterpolatePixel/UndefinedInterpolatePixel

[Thomas.Stegemann at materna.de]

Hello,

for inline images always the UndefinedInterpolatePixel interpolation is used:

In draw.c
> MagickExport MagickBooleanType DrawPrimitive(Image *image, const DrawInfo *draw_info,const PrimitiveInfo *primitive_info)
> [...]
>     case ImagePrimitive:
> [...]
the clone_info is set to default values (the default for interpolate is UndefinedInterpolatePixel)
and with this settings the inline image is created.
>       clone_info=AcquireImageInfo();
>       if (LocaleNCompare(primitive_info->text,"data:",5) == 0)
>         composite_image=ReadInlineImage(clone_info,primitive_info->text,
>           &image->exception);
>       else
>         {
>           (void) CopyMagickString(clone_info->filename,primitive_info->text,
>             MaxTextExtent);
>           composite_image=ReadImage(clone_info,&image->exception);
>         }
> [...]
Then the image with the default settings is drawn with DrawAffineImage
>         (void) DrawAffineImage(image,composite_image,&affine);



and in DrawAffineImage the interpolate method of the image to be drawn (UndefinedInterpolatePixel) is used.
> MagickExport MagickBooleanType DrawAffineImage(Image *image, const Image *source,const AffineMatrix *affine)
> [...]
>   resample_filter=AcquireResampleFilter(source,&image->exception);


I think it is more reasonable to use the the interpolate method of the image passed to DrawPrimitive, isn't it?

Best regards
Thomas Stegemann