https://pdfium-review.googlesource.com/c/pdfium/+/132130
From: Matt Jolly <kangie@gentoo.org>
Date: Fri, 16 May 2025 14:38:04 +1000
Subject: [PATCH] Fix build with system libpng

`cbc692a42241970e1da492d5b14326e81ecb1061` refactored
`fxcodec::CFX_DIBAttribute` and changed the name of its members.

Unfortunately this change appears to have been typo'd in the
'system libpng' build path, which is not checked by CI, resulting
in downstream build failures in Chromium.

Signed-off-by: Matt Jolly <kangie@gentoo.org>
--- a/third_party/pdfium/core/fxcodec/png/png_decoder.cpp
+++ b/third_party/pdfium/core/fxcodec/png/png_decoder.cpp
@@ -52,8 +52,8 @@ void _png_load_bmp_attribute(png_structp png_ptr,
                              CFX_DIBAttribute* pAttribute) {
   if (pAttribute) {
 #if defined(PNG_pHYs_SUPPORTED)
-    pAttribute->xdpi_ = png_get_x_pixels_per_meter(png_ptr, info_ptr);
-    pAttribute->ydpi_ = png_get_y_pixels_per_meter(png_ptr, info_ptr);
+    pAttribute->x_dpi_ = png_get_x_pixels_per_meter(png_ptr, info_ptr);
+    pAttribute->y_dpi_ = png_get_y_pixels_per_meter(png_ptr, info_ptr);
     png_uint_32 res_x, res_y;
     int unit_type;
     png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y, &unit_type);
-- 
2.49.0