Backport upstream compability patch for libpng16 wrt #465658 by Richard Grenville

Package-Manager: portage-2.2.0_alpha173/cvs/Linux x86_64
Manifest-Sign-Key: 0x4868F14D

1 files changed, 40 insertions, 0 deletions

diff --git a/x11-libs/cairo/files/cairo-1.12.14-libpng16.patch b/x11-libs/cairo/files/cairo-1.12.14-libpng16.patch
new file mode 100644
index 000000000000..c16317811982
--- /dev/null
+++ b/x11-libs/cairo/files/cairo-1.12.14-libpng16.patch
@@ -0,0 +1,40 @@
+From 2dd2c826a5b367d32cf2d48ed69754795990c5db Mon Sep 17 00:00:00 2001
+From: Chris Wilson <chris@chris-wilson.co.uk>
+Date: Tue, 16 Apr 2013 09:58:56 +0000
+Subject: png: Avoid marking the surface as in error after a png warning
+
+It turns out that libpng will continue to load an image after throwing a
+warning, and that libpng16 now throws warnings for images that libpng15
+and earlier loaded without error. As we were happily loading those
+images into cairo surfaces before, we are therefore being overzealous
+in throwing an error now - so just squelch the warning.
+
+Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
+---
+diff --git a/src/cairo-png.c b/src/cairo-png.c
+index e74a4a8..068617d 100644
+--- a/src/cairo-png.c
++++ b/src/cairo-png.c
+@@ -149,13 +149,13 @@ static void
+ png_simple_warning_callback (png_structp png,
+ 	                     png_const_charp error_msg)
+ {
+-    cairo_status_t *error = png_get_error_ptr (png);
+-
+-    /* default to the most likely error */
+-    if (*error == CAIRO_STATUS_SUCCESS)
+-	*error = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+-
+-    /* png does not expect to abort and will try to tidy up after a warning */
++    /* png does not expect to abort and will try to tidy up and continue
++     * loading the image after a warning. So we also want to return the
++     * (incorrect?) surface.
++     *
++     * We use our own warning callback to squelch any attempts by libpng
++     * to write to stderr as we may not be in control of that output.
++     */
+ }
+ 
+ 
+--
+cgit v0.9.0.2-2-gbebe