src/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   ::ppapi::thunk::PPB_BrowserFont_Trusted_API* AsPPB_BrowserFont_Trusted_API()
  43       override;
  44
  45   // PPB_BrowserFont_Trusted_API implementation.
  46   PP_Bool Describe(PP_BrowserFont_Trusted_Description* description,
  47                    PP_BrowserFont_Trusted_Metrics* metrics) override;
  48   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   int32_t MeasureText(const PP_BrowserFont_Trusted_TextRun* text) override;
  55   uint32_t CharacterOffsetForPixel(const PP_BrowserFont_Trusted_TextRun* text,
  56                                    int32_t pixel_position) override;
  57   int32_t PixelOffsetForCharacter(const PP_BrowserFont_Trusted_TextRun* text,
  58                                   uint32_t char_offset) override;
  59
  60  private:
  61   ~BrowserFontResource_Trusted() override;
  62
  63   // Internal version of DrawTextAt that takes a mapped PlatformCanvas.
  64   void DrawTextToCanvas(SkCanvas* destination,
  65                         const PP_BrowserFont_Trusted_TextRun& text,
  66                         const PP_Point* position,
  67                         uint32_t color,
  68                         const PP_Rect* clip,
  69                         PP_Bool image_data_is_opaque);
  70
  71  private:
  72   scoped_ptr<blink::WebFont> font_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(BrowserFontResource_Trusted);
  75 };
  76
  77 }  // namespace content
  78
  79 #endif  // CONTENT_CHILD_BROWSER_FONT_RESOURCE_TRUSTED_H_