content/child/browser_font_resource_trusted.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_CHILD_BROWSER_FONT_RESOURCE_TRUSTED_H_
   6 #define CONTENT_CHILD_BROWSER_FONT_RESOURCE_TRUSTED_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "ppapi/c/pp_bool.h"
  13 #include "ppapi/c/pp_instance.h"
  14 #include "ppapi/c/pp_resource.h"
  15 #include "ppapi/c/pp_stdint.h"
  16 #include "ppapi/proxy/plugin_resource.h"
  17 #include "ppapi/shared_impl/ppapi_preferences.h"
  18 #include "ppapi/thunk/ppb_browser_font_trusted_api.h"
  19
  20 class SkCanvas;
  21
  22 namespace blink {
  23 class WebFont;
  24 }
  25
  26 namespace content {
  27
  28 class BrowserFontResource_Trusted
  29     : public ppapi::proxy::PluginResource,
  30       public ppapi::thunk::PPB_BrowserFont_Trusted_API {
  31  public:
  32   BrowserFontResource_Trusted(ppapi::proxy::Connection connection,
  33                               PP_Instance instance,
  34                               const PP_BrowserFont_Trusted_Description& desc,
  35                               const ppapi::Preferences& prefs);
  36
  37   // Validates the parameters in thee description. Can be called on any thread.
  38   static bool IsPPFontDescriptionValid(
  39       const PP_BrowserFont_Trusted_Description& desc);
  40
  41   // Resource override.
  42   virtual ::ppapi::thunk::PPB_BrowserFont_Trusted_API*
  43       AsPPB_BrowserFont_Trusted_API() OVERRIDE;
  44
  45   // PPB_BrowserFont_Trusted_API implementation.
  46   virtual PP_Bool Describe(PP_BrowserFont_Trusted_Description* description,
  47                            PP_BrowserFont_Trusted_Metrics* metrics) OVERRIDE;
  48   virtual PP_Bool DrawTextAt(PP_Resource image_data,
  49                              const PP_BrowserFont_Trusted_TextRun* text,
  50                              const PP_Point* position,
  51                              uint32_t color,
  52                              const PP_Rect* clip,
  53                              PP_Bool image_data_is_opaque) OVERRIDE;
  54   virtual int32_t MeasureText(
  55       const PP_BrowserFont_Trusted_TextRun* text) OVERRIDE;
  56   virtual uint32_t CharacterOffsetForPixel(
  57       const PP_BrowserFont_Trusted_TextRun* text,
  58       int32_t pixel_position) OVERRIDE;
  59   virtual int32_t PixelOffsetForCharacter(
  60       const PP_BrowserFont_Trusted_TextRun* text,
  61       uint32_t char_offset) OVERRIDE;
  62
  63  private:
  64   virtual ~BrowserFontResource_Trusted();
  65
  66   // Internal version of DrawTextAt that takes a mapped PlatformCanvas.
  67   void DrawTextToCanvas(SkCanvas* destination,
  68                         const PP_BrowserFont_Trusted_TextRun& text,
  69                         const PP_Point* position,
  70                         uint32_t color,
  71                         const PP_Rect* clip,
  72                         PP_Bool image_data_is_opaque);
  73
  74  private:
  75   scoped_ptr<blink::WebFont> font_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(BrowserFontResource_Trusted);
  78 };
  79
  80 }  // namespace content
  81
  82 #endif  // CONTENT_CHILD_BROWSER_FONT_RESOURCE_TRUSTED_H_