Handle an extension printer supporting only PWG raster data

chrome/browser/ui/webui/print_preview/extension_printer_handler.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/print_preview/printer_handler.h"
+#include "extensions/browser/api/printer_provider/printer_provider_api.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 class RefCountedMemory;
 }
 
 namespace content {
 class BrowserContext;
 }
 
+namespace cloud_devices {
+class CloudDeviceDescription;
+}
+
+namespace gfx {
+class Size;
+}
+
+#if defined(ENABLE_SERVICE_DISCOVERY)
+namespace local_discovery {
+class PWGRasterConverter;
+}
+#endif
+
 // Implementation of PrinterHandler interface backed by printerProvider
 // extension API.
 class ExtensionPrinterHandler : public PrinterHandler {
  public:
+  using RefCountedMemoryCallback =
+      base::Callback<void(const scoped_refptr<base::RefCountedMemory>&)>;
+
   explicit ExtensionPrinterHandler(content::BrowserContext* browser_context);
 
   ~ExtensionPrinterHandler() override;
 
   // PrinterHandler implementation:
   void Reset() override;
   void StartGetPrinters(
       const PrinterHandler::GetPrintersCallback& callback) override;
   void StartGetCapability(
       const std::string& destination_id,
       const PrinterHandler::GetCapabilityCallback& calback) override;
   // TODO(tbarzic): It might make sense to have the strings in a single struct.
   void StartPrint(const std::string& destination_id,
                   const std::string& capability,
                   const std::string& ticket_json,
+                  const gfx::Size& size,
                   const scoped_refptr<base::RefCountedMemory>& print_data,
                   const PrinterHandler::PrintCallback& callback) override;
 
  private:
+  // Converts |data| to PWG raster format (from PDF) for a printer described
+  // by |printer_description|.
+  // |callback| is called with the converted data.
+  void ConvertToPWGRaster(
+      const scoped_refptr<base::RefCountedMemory>& data,
+      const cloud_devices::CloudDeviceDescription& printer_description,
+      const gfx::Size& size,
+      const RefCountedMemoryCallback& callback);
+
+  // Sets print job document data and dispatches it using printerProvider API.
+  // TODO(tbarzic): Move PrinterProvider::PrintJob to it's own file so it can
+  // be forward-declared.
+  void DispatchPrintJob(
+      const PrinterHandler::PrintCallback& callback,
+      scoped_ptr<extensions::PrinterProviderAPI::PrintJob> print_job,
+      const scoped_refptr<base::RefCountedMemory>& data);
+
   // Methods used as wrappers to callbacks for extensions::PrinterProviderAPI
   // methods, primarily so the callbacks can be bound to this class' weak ptr.
   // They just propagate results to callbacks passed to them.
   void WrapGetPrintersCallback(
       const PrinterHandler::GetPrintersCallback& callback,
       const base::ListValue& pritners,
       bool done);
   void WrapGetCapabilityCallback(
       const PrinterHandler::GetCapabilityCallback& callback,
       const std::string& destination_id,
       const base::DictionaryValue& capability);
   void WrapPrintCallback(const PrinterHandler::PrintCallback& callback,
                          bool success,
                          const std::string& status);
 
   content::BrowserContext* browser_context_;
 
+#if defined(ENABLE_SERVICE_DISCOVERY)

[tbarzic, 2015/02/13 03:08:13]

actually, looking at chrome_browser_gypi, this is included when
enable_print_preview == 1, so I guess ifdef is not really needed?

[Vitaly Buka (NO REVIEWS), 2015/02/17 19:43:54]

ok

+  // TODO(tbarzic): See if local_discovery::PWGRasterConverter can be moved to a
+  // place that can be used without ifdefs.
+  scoped_ptr<local_discovery::PWGRasterConverter> pwg_raster_converter_;
+#endif
+
   base::WeakPtrFactory<ExtensionPrinterHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrinterHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_