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ply-pixel-buffer: Fix right and bottom edge rendering of scaled buffers

Hans de Goede requested to merge jwrdegoede/plymouth:ply-pixel-buf-interpolate-fix into master

When scaling a buffer 2x and calling ply_pixels_interpolate to interpolate the last row / column, the extra pixels used for pixels would go out of bounds and be replaced with a black pixel. This causes a 50% dimming of the last row / column.

This 50% dimming leads to an ugly darkline when a theme draws 2 images which are supposed to be joined together.

This commit fixes this by clipping the coordinates to the source image limits instead of using black pixels when interpolating right and bottom edge pixels.

Signed-off-by: Hans de Goede hdegoede@redhat.com

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