Re: gdk_pixbuf_composite leaves artifacts in the dest pixbuf, if, dest_x is > 0. Help please?

[Todor Todorov <ttodorov gmx net>]

OK, something happened to the attached images, so let's see about 
inlining them ...

offset is zero, no artifacts offset is zero, no artifacts

offset is 16, artifacts at the right side of the imageoffset is 16, 
artifacts at the right side of the image

On 11/10/2009 06:39 PM, Todor Todorov wrote:
> Hello list,
>
> I am trying to create a thumbnail from a digital image, which should 
> not exceed 128 px width or height. After loading the image, I apply 
> the EXIF orientation information, if available. In order to prettify 
> the resulting display, I would like to place the pixbuf horizontally 
> centered onto another transparent pixbuf with dimensions 128x128 px. 
> Here is (part of) the code I use (removed the error checking for 
> simplification):
>
> gchar *imgSrcName;
> GdkPixbuf *src, *interm, *result;
> guint width, height, xOffset;
> int i = 0;
> ...
> src = gdk_pixbuf_load_from_file_at_scale( imgSrcName, 128, 128, TRUE, 
> NULL );
> result = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 
> gdk_pixbuf_get_bits_per_sample( src ), 128, 128 );
>
> interm = gdk_pixbuf_apply_embedded_orientation( src );
> gdk_pixbuf_unref( src );
> width = gdk_pixbuf_get_width( interm );
> height = gdk_pixbuf_get_height( interm );
> while ( i < 2 )
> {
>         gchar *save;
>
>         gdk_pixbuf_fill( result, 0xffffff00 );
>         xOffset = i++ * ( 128 - width ) / 2;
>         gdk_pixbuf_composite( interm, result, xOffset, 0, width, 
> height, 0, 0, 1.0, 1.0, GDK_INTERP_NEAREST, 255 );
>
>         save = g_strdup_printf( "test%d.jpg", i );
>         gdk_pixbuf_save( result, save, "jpeg", NULL, "quality", "100", 
> NULL );
>         g_free( save );
> }
> gdk_pixbuf_unref( interm );
> gdk_pixbuf_unref( result );
>
> As you can see in the attached images, the result is OK only if the 
> xOffset on translation is 0. The centered version shows artifacts on 
> the right border of the image. And it does not make a speck of 
> difference, if the interpolation type is _BILINEAR or _HYPER ...
>
> Could anyone please help in solving this ?
>
> Regards
>
> Todor
>
>
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