Supply default icon to extension icon image.

chrome/browser/extensions/extension_icon_image.cc

Index: chrome/browser/extensions/extension_icon_image.cc
diff --git a/chrome/browser/extensions/extension_icon_image.cc b/chrome/browser/extensions/extension_icon_image.cc
index dcd096815c03ab6c26653705b041539a73703acc..b0087c0cbddb84cc61dd6c68c1efaa1314a3f263 100644
--- a/chrome/browser/extensions/extension_icon_image.cc
+++ b/chrome/browser/extensions/extension_icon_image.cc
@@ -29,6 +29,30 @@ ExtensionResource GetExtensionIconResource(
   return extension->GetResource(path);
 }
 
+class BlankImageSource : public gfx::ImageSkiaSource {
+ public:
+  explicit BlankImageSource(int size_in_dip) : size_in_dip_(size_in_dip) {}
+  virtual ~BlankImageSource() {}
+
+ private:
+  // gfx::ImageSkiaSource overrides:
+  virtual gfx::ImageSkiaRep GetImageForScale(
+      ui::ScaleFactor scale_factor) OVERRIDE {
+    SkBitmap bitmap;
+    const float scale = ui::GetScaleFactorScale(scale_factor);
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config,
+                     static_cast<int>(size_in_dip_ * scale),
+                     static_cast<int>(size_in_dip_ * scale));
+    bitmap.allocPixels();
+    bitmap.eraseColor(SkColorSetARGB(0, 0, 0, 0));
+    return gfx::ImageSkiaRep(bitmap, scale_factor);
+  }
+
+  int size_in_dip_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlankImageSource);
+};
+
 }  // namespace
 
 namespace extensions {
@@ -38,7 +62,7 @@ namespace extensions {
 
 class IconImage::Source : public gfx::ImageSkiaSource {
  public:
-  explicit Source(IconImage* host);
+  Source(IconImage* host, int size_in_dip);
   virtual ~Source();
 
   void ResetHost();
@@ -50,10 +74,17 @@ class IconImage::Source : public gfx::ImageSkiaSource {
 
   IconImage* host_;
 
+  // Image whose representations will be used until |host_| load the real
+  // representations for the image.
+  gfx::ImageSkia blank_image_;
+
   DISALLOW_COPY_AND_ASSIGN(Source);
 };
 
-IconImage::Source::Source(IconImage* host) : host_(host) {
+IconImage::Source::Source(IconImage* host, int size_in_dip)
+    : host_(host),
+      blank_image_(new BlankImageSource(size_in_dip),
+                   gfx::Size(size_in_dip, size_in_dip)) {
 }
 
 IconImage::Source::~Source() {
@@ -65,9 +96,14 @@ void IconImage::Source::ResetHost() {
 
 gfx::ImageSkiaRep IconImage::Source::GetImageForScale(
     ui::ScaleFactor scale_factor) {
+  gfx::ImageSkiaRep representation;
   if (host_)
-    host_->LoadImageForScaleFactor(scale_factor);
-  return gfx::ImageSkiaRep();
+    representation = host_->LoadImageForScaleFactor(scale_factor);
+
+  if (!representation.is_null())
+    return representation;
+
+  return blank_image_.GetRepresentation(scale_factor);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -77,6 +113,7 @@ IconImage::IconImage(
     const Extension* extension,
     const ExtensionIconSet& icon_set,
     int resource_size_in_dip,
+    const gfx::ImageSkia& default_icon,
     Observer* observer)
     : extension_(extension),
       icon_set_(icon_set),
@@ -84,8 +121,9 @@ IconImage::IconImage(
       desired_size_in_dip_(resource_size_in_dip, resource_size_in_dip),
       observer_(observer),
       source_(NULL),
+      default_icon_(default_icon),
       ALLOW_THIS_IN_INITIALIZER_LIST(tracker_(this)) {
-  source_ = new Source(this);
+  source_ = new Source(this, resource_size_in_dip);

[pkotwicz, 2012/08/28 18:56:57]

Nit 1: I find it confusing to have both desired_size_in_dip_ and
resource_size_in_dip_.
Can you remove desired_size_in_dip_. I think we only use it in two places in
this file?
Nit 2: Can you use a gfx::Size argument for Source() on line 126?

[tbarzic, 2012/08/29 18:41:28]

Done.

   image_skia_ = gfx::ImageSkia(source_, desired_size_in_dip_);
 
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
@@ -98,10 +136,11 @@ IconImage::~IconImage() {
     source_->ResetHost();
 }
 
-void IconImage::LoadImageForScaleFactor(ui::ScaleFactor scale_factor) {
+gfx::ImageSkiaRep IconImage::LoadImageForScaleFactor(
+    ui::ScaleFactor scale_factor) {
   // Do nothing if extension is unloaded.
   if (!extension_)
-    return;
+    return gfx::ImageSkiaRep();
 
   const float scale = ui::GetScaleFactorScale(scale_factor);
   const int resource_size_in_pixel =
@@ -120,15 +159,13 @@ void IconImage::LoadImageForScaleFactor(ui::ScaleFactor scale_factor) {
         resource_size_in_pixel, ExtensionIconSet::MATCH_SMALLER);
   }
 
-  // If there is no resource found, bail out and notify observer of failure.
-  if (resource.empty()) {
-    if (observer_)
-      observer_->OnIconImageLoadFailed(this, scale_factor);
-    return;
-  }
+  // If there is no resource found, return default icon.
+  if (resource.empty())
+    return default_icon_.GetRepresentation(scale_factor);
 
   int id = tracker_.next_id();
-  load_map_[id] = scale_factor;
+  load_map_[id].scale_factor = scale_factor;
+  load_map_[id].is_async = false;
 
   std::vector<ImageLoadingTracker::ImageRepresentation> info_list;
   info_list.push_back(ImageLoadingTracker::ImageRepresentation(
@@ -137,31 +174,52 @@ void IconImage::LoadImageForScaleFactor(ui::ScaleFactor scale_factor) {
       desired_size_in_dip_.Scale(scale),
       scale_factor));
   tracker_.LoadImages(extension_, info_list, ImageLoadingTracker::DONT_CACHE);
+
+  // If we have not received |OnImageLoaded|, image load request is
+  // asynchronous.
+  if (load_map_.find(id) != load_map_.end())
+    load_map_[id].is_async = true;
+
+  // If LaodImages returned synchronously and the requested image rep is cached

[pkotwicz, 2012/08/28 18:56:57]

Nit: LoadImages()

[tbarzic, 2012/08/29 18:41:28]

Done.

+  // in the extension, return the cached image rep.
+  if (image_skia_.HasRepresentation(scale_factor))
+    return image_skia_.GetRepresentation(scale_factor);
+
+  return gfx::ImageSkiaRep();
 }
 
-void IconImage::OnImageLoaded(const gfx::Image& image,
+void IconImage::OnImageLoaded(const gfx::Image& image_in,
                               const std::string& extension_id,
                               int index) {
   LoadMap::iterator load_map_it = load_map_.find(index);
   DCHECK(load_map_it != load_map_.end());
 
-  ui::ScaleFactor scale_factor = load_map_it->second;
+  ui::ScaleFactor scale_factor = load_map_it->second.scale_factor;
+  bool is_async = load_map_it->second.is_async;
 
   load_map_.erase(load_map_it);
 
-  if (image.IsEmpty()) {
-    // There waas an error loading the image.
-    if (observer_)
-      observer_->OnIconImageLoadFailed(this, scale_factor);
+  const gfx::ImageSkia* image =
+      image_in.IsEmpty() ? &default_icon_ : image_in.ToImageSkia();
+
+  // Maybe default icon was not set.
+  if (image->isNull())
     return;
-  }
 
-  DCHECK(image.ToImageSkia()->HasRepresentation(scale_factor));
-  gfx::ImageSkiaRep rep = image.ToImageSkia()->GetRepresentation(scale_factor);
+  // TODO(tbarzic): add DCHECK(image->HasRepresentation(scale_factor)) once
+  // we'll be certain that icons from resource bundle have all needed scale

[pkotwicz, 2012/08/28 18:56:57]

Nit: we'll be -> we are

[tbarzic, 2012/08/29 18:41:28]

Done.

+  // factors.
+  gfx::ImageSkiaRep rep = image->GetRepresentation(scale_factor);
   DCHECK(!rep.is_null());
+
+  // Remove old representation if there is one.
+  image_skia_.RemoveRepresentation(rep.scale_factor());
   image_skia_.AddRepresentation(rep);
 
-  if (observer_)
+  // If |tracker_| called us synchronously the image did not really change from
+  // the observers perspective, since the initial image representation is
+  // returned synchronously.
+  if (is_async && observer_)
     observer_->OnExtensionIconImageChanged(this);
 }