[mojosetup] Support for BMPV5 headers

[Sam Izzo]

Hi,

I added support for BMPV5 headers. Attached is a patch. I pulled the 
change from the latest stb_image, which already supports it. BMPV5 adds 
ICC colour profiles; stb_image just ignores it.

My ImageMagick was generating BMPV5 format, and I had no idea why the 
image wasn't showing up in the installer (I also have changes to add 
some more debug logging if you want to merge that in too).

I considered merging in the latest stb_image but it's quite a bit newer, 
and there were a lot of changes. It was going to be more work than I 
wanted to do right now :)

Cheers,
Sam
-------------- next part --------------
# HG changeset patch
# User Sam Izzo <sam at humbug.net>
# Date 1463631005 -36000
#      Thu May 19 14:10:05 2016 +1000
# Node ID 7473ad8918d5eb5fdde727027f15ea5b3e3300a9
# Parent  0e351d80da0467cc7b11a5a8c5ce5aa3f0aca153
Pulled in support for V5 BMP headers from the latest stb_image.

diff -r 0e351d80da04 -r 7473ad8918d5 stb_image.c
--- a/stb_image.c	Fri Jan 01 19:53:21 2016 +0100
+++ b/stb_image.c	Thu May 19 14:10:05 2016 +1000
@@ -2661,7 +2661,7 @@
    get16le(); // discard reserved
    get32le(); // discard data offset
    sz = get32le();
-   if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
+   if (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124) return 1;
    return 0;
 }
 
@@ -2744,7 +2744,7 @@
    get16le(); // discard reserved
    offset = get32le();
    hsz = get32le();
-   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
+   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return epuc("unknown BMP", "BMP type not supported: unknown");
    failure_reason = "bad BMP";
    if (hsz == 12) {
       img_x = get16le();
@@ -2801,7 +2801,8 @@
                return NULL;
          }
       } else {
-         assert(hsz == 108);
+         if (hsz != 108 && hsz != 124)
+            return epuc("bad BMP", "bad BMP");
          mr = get32le();
          mg = get32le();
          mb = get32le();
@@ -2809,6 +2810,12 @@
          get32le(); // discard color space
          for (i=0; i < 12; ++i)
             get32le(); // discard color space parameters
+         if (hsz == 124) {
+            get32le(); // discard rendering intent
+            get32le(); // discard offset of profile data
+            get32le(); // discard size of profile data
+            get32le(); // discard reserved
+         }
       }
       if (bpp < 16)
          psize = (offset - 14 - hsz) >> 2;