Move image_diff code into testing/image_diff/

It is not actually a sample program to demonstrate how to use PDFium
APIs. It is more of a test utility program.

Remove header include dependency from samples/ to core/, to set a good
example.

Change-Id: Idd5d567c82314bcf0e4a7bec8a3210e7d57226ee
Reviewed-on: https://pdfium-review.googlesource.com/6871
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 2c038b29c8..f577986f8e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -260,6 +260,18 @@ static_library("test_support") {
   configs += [ ":pdfium_core_config" ]
 }
 
+static_library("image_diff") {
+  testonly = true
+  sources = [
+    "testing/image_diff/image_diff_png.cpp",
+    "testing/image_diff/image_diff_png.h",
+  ]
+  deps = []
+  if (!pdf_enable_xfa) {
+    deps += [ "third_party:fx_lpng" ]
+  }
+}
+
 # Targets below this are only visible within this file (and to the
 # top-level gn_visibility target used to help gn_all build everything).
 visibility = [
@@ -2045,6 +2057,22 @@ if (pdf_is_standalone) {
       "//samples",
     ]
   }
+
+  executable("pdfium_diff") {
+    testonly = true
+    sources = [
+      "testing/image_diff/image_diff.cpp",
+    ]
+    deps = [
+      ":image_diff",
+      ":pdfium",
+      "//build/config:exe_and_shlib_deps",
+      "//build/win:default_exe_manifest",
+    ]
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+  }
+
   group("fuzzers") {
     testonly = true
     deps = [
@@ -2062,6 +2090,7 @@ group("pdfium_all") {
   if (pdf_is_standalone) {
     deps += [
       ":fuzzers",
+      ":pdfium_diff",
       ":samples",
     ]
   }