Add support for fill and stroke RGBA in CPDF_PageContentGenerator

CPDF_PageObject is a CPDF_GraphicStates, which allows us to add graphics
information to the object itself. The RGB can be added easily in the stream.
The alpha parameter needs to be in a dictionary contained in the ExtGState,
which should be part of the page's resources.

BUG=pdfium:661

Change-Id: Id99b2ece7aa201e3550c765ac2b5eeff4b43fc48
Reviewed-on: https://pdfium-review.googlesource.com/2530
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/core/fpdfapi/edit/cpdf_pagecontentgenerator.h b/core/fpdfapi/edit/cpdf_pagecontentgenerator.h
index c74652e206..e48ea4a7c9 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentgenerator.h
+++ b/core/fpdfapi/edit/cpdf_pagecontentgenerator.h
@@ -7,6 +7,7 @@
 #ifndef CORE_FPDFAPI_EDIT_CPDF_PAGECONTENTGENERATOR_H_
 #define CORE_FPDFAPI_EDIT_CPDF_PAGECONTENTGENERATOR_H_
 
+#include <map>
 #include <vector>
 
 #include "core/fxcrt/fx_basic.h"
@@ -26,14 +27,21 @@ class CPDF_PageContentGenerator {
   void GenerateContent();
 
  private:
-  friend class cpdf_pagecontentgenerator_ProcessRect_Test;
-  friend class cpdf_pagecontentgenerator_ProcessPath_Test;
+  friend class CPDF_PageContentGeneratorTest;
 
   void ProcessPath(CFX_ByteTextBuf* buf, CPDF_PathObject* pPathObj);
   void ProcessImage(CFX_ByteTextBuf* buf, CPDF_ImageObject* pImageObj);
+  void ProcessGraphics(CFX_ByteTextBuf* buf, CPDF_PageObject* pPageObj);
   CFX_ByteString RealizeResource(uint32_t dwResourceObjNum,
                                  const CFX_ByteString& bsType);
 
+  struct GraphicsData {
+    FX_FLOAT fillAlpha;
+    FX_FLOAT strokeAlpha;
+    bool operator<(const GraphicsData& other) const;
+  };
+
+  std::map<GraphicsData, CFX_ByteString> m_GraphicsMap;
   CPDF_Page* const m_pPage;
   CPDF_Document* const m_pDocument;
   std::vector<CPDF_PageObject*> m_pageObjects;