[ruby-gnome2-devel-ja] =?iso-2022-jp?B?R2RrOjpQaXhidWYjcA==?= =?iso-2022-jp?B?aXhlbHMbJEIkTiU1JSQlOiRON1c7O0p9SyEbKEI=?=

[Kouhei S. <ko...@co...>]

須藤です．

Gdk::Pixbuf#pixelsのサイズの計算方法がちょっとまずいかもしれ
ません．

  http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-gdk-pixbuf.html#GdkPixbufError

のちょっと上の方にあるNoteには以下のように書いてあります．

  If you are doing memcpy() of raw pixbuf data, note that
  the last row in the pixbuf may not be as wide as the full
  rowstride, but rather just as wide as the pixel data needs
  to be. That is, it is unsafe to do memcpy (dest, pixels,
  rowstride * height) to copy a whole pixbuf. Use
  gdk_pixbuf_copy() instead, or compute the width in bytes
  of the last row as width * ((n_channels * bits_per_sample
  + 7) / 8).

現在のGdk::Pixbuf#pixelsはrowstride * heightでサイズを計算し
ています．サイズの計算方法をgdk_pixbuf_copy()と同じようにし
た方がよいのではないでしょうか？