Ensure that inactive tab images line up correctly with frame image when...

Ensure that inactive tab images line up correctly with frame image when themed.  Also fix HasCustomImage so that it only returns true when the image is in the extension's original set, not just a generated theme for the cache.

BUG= http://crbug.com/21134
TEST= install a theme with a detailed frame background.  Open many tabs.  Make sure the inactive tab image lines up with the frame image.

Review URL: http://codereview.chromium.org/193030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25829 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/browser_theme_provider.cc

@@ -5,6 +5,7 @@
 #include "chrome/browser/browser_theme_provider.h"
 
 #include "base/file_util.h"
+#include "base/string_util.h"
 #include "base/gfx/png_decoder.h"
 #include "base/gfx/png_encoder.h"
 #include "base/string_util.h"
@@ -145,6 +146,10 @@ static const int kDefaultDisplayPropertyNTPTiling =
     BrowserThemeProvider::NO_REPEAT;
 static const int kDefaultDisplayPropertyNTPInverseLogo = 0;
 
+// The sum of kFrameBorderThickness and kNonClientRestoredExtraThickness from
+// OpaqueBrowserFrameView.
+static const int kRestoredTabVerticalOffset = 15;
+
 // The image resources that will be tinted by the 'button' tint value.
 static const int kToolbarButtonIDs[] = {
   IDR_BACK, IDR_BACK_D, IDR_BACK_H, IDR_BACK_P,
@@ -481,7 +486,15 @@ bool BrowserThemeProvider::HasCustomImage(int id) {
   if (!themeable_images_[id])
     return false;
 
-  return (images_.find(id) != images_.end());
+  // A custom image = base name is NOT equal to resource name.  See note in
+  // SaveThemeBitmap describing the process by which an original image is
+  // tagged.
+  if (images_.find(id) != images_.end() &&
+      resource_names_.find(id) != resource_names_.end())
+    return !EndsWith(UTF8ToWide(images_[id]),
+                     UTF8ToWide(resource_names_[id]), false);
+  else
+    return false;
 }
 
 bool BrowserThemeProvider::GetRawData(int id,
@@ -612,17 +625,27 @@ SkBitmap* BrowserThemeProvider::LoadThemeBitmap(int id) {
 }
 
 void BrowserThemeProvider::SaveThemeBitmap(
-    const std::string resource_name, int id) {
+    std::string resource_name, int id) {
   DCHECK(CalledOnValidThread());
   if (!image_cache_[id]) {
     NOTREACHED();
     return;
   }
 
+  // The images_ directory, at this point, contains only the custom images
+  // provided by the extension. We tag these images "_original" in the prefs
+  // file so we can distinguish them from images which have been generated and
+  // saved to disk by the theme caching process (WriteImagesToDisk).  This way,
+  // when we call HasCustomImage, we can check for the "_original" tag to see
+  // whether an image was originally provided by the extension, or saved
+  // in the caching process.
+  if (images_.find(id) != images_.end())
+    resource_name.append("_original");
+
 #if defined(OS_WIN)
-  FilePath image_path = image_dir_.Append(FilePath(UTF8ToWide(resource_name)));
+  FilePath image_path = image_dir_.Append(UTF8ToWide(resource_name));
 #elif defined(OS_POSIX)
-  FilePath image_path = image_dir_.Append(FilePath(resource_name));
+  FilePath image_path = image_dir_.Append(resource_name);
 #endif
 
   images_disk_cache_[image_path] = id;
@@ -1024,8 +1047,12 @@ SkBitmap* BrowserThemeProvider::GenerateBitmap(int id) {
       }
       std::map<int, SkBitmap*>::iterator it = image_cache_.find(base_id);
       if (it != image_cache_.end()) {
-        SkBitmap* bg_tab = new SkBitmap(TintBitmap(*(it->second),
-                                                   TINT_BACKGROUND_TAB));
+        SkBitmap bg_tint = TintBitmap(*(it->second), TINT_BACKGROUND_TAB);
+        int vertical_offset = HasCustomImage(id) ?
+            kRestoredTabVerticalOffset : 0;
+        SkBitmap* bg_tab = new SkBitmap(
+            skia::ImageOperations::CreateTiledBitmap(bg_tint, 0,
+            vertical_offset, bg_tint.width(), bg_tint.height()));
 
         // If they've provided a custom image, overlay it.
         if (HasCustomImage(id)) {