Transparency

webkit/tools/test_shell/test_shell.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8_proxy.h"
 #undef LOG
 
 #include "webkit/tools/test_shell/test_shell.h"
 
 
@@ skipping 230 matching lines @@
   scoped_ptr<skia::BitmapPlatformDevice> device;
   if (!web_frame->CaptureImage(&device, true))
     return std::string();
 
   const SkBitmap& src_bmp = device->accessBitmap(false);
 
   // Encode image.
   std::vector<unsigned char> png;
   SkAutoLockPixels src_bmp_lock(src_bmp);
   PNGEncoder::ColorFormat color_format = PNGEncoder::FORMAT_BGRA;
-#if defined(OS_WIN) || defined(OS_LINUX)
+
+  // Fix the alpha. The expected PNGs on Mac have an alpha channel, so we want
+  // to keep it. On Windows, the alpha channel is wrong since text/form control
+  // drawing may have erased it in a few places. So on Windows we force it to
+  // opaque and also don't write the alpha channel for the reference. Linux
+  // doesn't have the wrong alpha like Windows, but we ignore it anyway.
+#if defined(OS_WIN)
+  bool discard_transparency = true;
+  device->makeOpaque(0, 0, src_bmp.width(), src_bmp.height());
+#elif defined(OS_LINUX)
   bool discard_transparency = true;
 #elif defined(OS_MACOSX)
-  // the expected PNGs in webkit have an alpha channel. We shouldn't discard
-  // the transparency for reference purposes, though the hashes will still
-  // match.
   bool discard_transparency = false;
 #endif
   PNGEncoder::Encode(
       reinterpret_cast<const unsigned char*>(src_bmp.getPixels()),
       color_format, src_bmp.width(), src_bmp.height(),
       static_cast<int>(src_bmp.rowBytes()), discard_transparency, &png);
 
   // Write to disk.
   file_util::WriteFile(file_name, reinterpret_cast<const char *>(&png[0]),
                        png.size());
@@ skipping 362 matching lines @@
 
 uint64 VisitedLinkHash(const char* canonical_url, size_t length) {
   return 0;
 }
 
 bool IsLinkVisited(uint64 link_hash) {
   return false;
 }
 
 }  // namespace webkit_glue