Re: [PATCH 0/1] MR3865: gdiplus: implement PixelOffsetMode Half and HighQuality for GdipDrawImagePointsRect

[Bartosz Kosiorek (＠gang65)]

Bartosz Kosiorek (@gang65) commented about dlls/gdiplus/graphics.c:
> -
>            // PixelOffsetMode None and HighSpeed is not drawing outside dst_area,
> -
>            // that's why we are using ceilf and floorf.
> -
>            dst_area.left = ceilf(dst_area_left);
> -
>            dst_area.top = ceilf(dst_area_top);
> -
>            dst_area.right = floorf(dst_area_right);
> -
>            dst_area.bottom = floorf(dst_area_bottom);
> -
>        }
> -
>        else
> -
>        {
> -
>            // Based on experiments dst_area with value 0.5 should be rounded to 0.0
> -
>            // That't why we are adding 0.4999 instead of 0.5
> -
>            dst_area.left = (INT)(dst_area_left + 0.4999);
> -
>            dst_area.top = (INT)(dst_area_top + 0.4999);
> -
>            dst_area.right = (INT)(dst_area_right + 0.4999);
> -
>            dst_area.bottom = (INT)(dst_area_bottom + 0.4999);
> -
>        }

Based on experiments I have managed to check how destination size is calculated.