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add big-endian BGRA (Cairo) pixel buffer to RGBA (GdkPixbuf) pixel buffer conversion - restores text to the editor canvas on big-endian machines

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git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@7841 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2010-09-24 21:42:15 +00:00
parent f050cf93c2
commit 62cd380b8b
1 changed files with 37 additions and 14 deletions
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51
gtk2_ardour/utils.cc
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@ -861,6 +861,7 @@ convert_color_channel (guint8 src,
return alpha ? ((guint (src) << 8) - src) / alpha : 0;
}
void
convert_bgra_to_rgba (guint8 const* src,
guint8* dst,
@ -870,20 +871,42 @@ convert_bgra_to_rgba (guint8 const* src,
guint8 const* src_pixel = src;
guint8* dst_pixel = dst;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++)
{
dst_pixel[0] = convert_color_channel (src_pixel[2],
src_pixel[3]);
dst_pixel[1] = convert_color_channel (src_pixel[1],
src_pixel[3]);
dst_pixel[2] = convert_color_channel (src_pixel[0],
src_pixel[3]);
dst_pixel[3] = src_pixel[3];
dst_pixel += 4;
src_pixel += 4;
}
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* Cairo [ B G R A ] is actually [ B G R A ] in memory SOURCE
0 1 2 3
Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
*/
dst_pixel[0] = convert_color_channel (src_pixel[2],
src_pixel[3]); // R [0] <= [ 2 ]
dst_pixel[1] = convert_color_channel (src_pixel[1],
src_pixel[3]); // G [1] <= [ 1 ]
dst_pixel[2] = convert_color_channel (src_pixel[0],
src_pixel[3]); // B [2] <= [ 0 ]
dst_pixel[3] = src_pixel[3]; // alpha
#elif G_BYTE_ORDER == G_BIG_ENDIAN
/* Cairo [ B G R A ] is actually [ A R G B ] in memory SOURCE
0 1 2 3
Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
*/
dst_pixel[0] = convert_color_channel (src_pixel[1],
src_pixel[0]); // R [0] <= [ 1 ]
dst_pixel[1] = convert_color_channel (src_pixel[2],
src_pixel[0]); // G [1] <= [ 2 ]
dst_pixel[2] = convert_color_channel (src_pixel[3],
src_pixel[0]); // B [2] <= [ 3 ]
dst_pixel[3] = src_pixel[0]; // alpha
#else
#error ardour does not currently support PDP-endianess
#endif
dst_pixel += 4;
src_pixel += 4;
}
}
}
Glib::RefPtr<Gdk::Pixbuf>