Bug 1105834 - Part 3: Add lz4 support. r=jrmuizel

gfx/layers/composite/CompositableHost.cpp

@@ -218,12 +218,7 @@ CompositableHost::DumpTextureHost(std::stringstream& aStream, TextureHost* aText
   if (!dSurf) {
     return;
   }
-  gfxPlatform *platform = gfxPlatform::GetPlatform();
-  RefPtr<gfx::DrawTarget> dt = platform->CreateDrawTargetForData(dSurf->GetData(),
-                                                                 dSurf->GetSize(),
-                                                                 dSurf->Stride(),
-                                                                 dSurf->GetFormat());
-  aStream << gfxUtils::GetAsDataURI(dt).get();
+  aStream << gfxUtils::GetAsLZ4Base64Str(dSurf).get();
 }
 #endif
 

gfx/layers/composite/TextureHost.cpp

@@ -335,7 +335,7 @@ TextureHost::PrintInfo(std::stringstream& aStream, const char* aPrefix)
     aStream << "\n" << pfx.get() << "Surface: ";
     RefPtr<gfx::DataSourceSurface> dSurf = GetAsSurface();
     if (dSurf) {
-      aStream << gfxUtils::GetAsDataURI(dSurf).get();
+      aStream << gfxUtils::GetAsLZ4Base64Str(dSurf).get();
     }
   }
 #endif

gfx/thebes/gfxUtils.cpp

@@ -43,6 +43,10 @@ using namespace mozilla::gfx;
 
 #include "DeprecatedPremultiplyTables.h"
 
+#undef compress
+#include "mozilla/Compression.h"
+
+using namespace mozilla::Compression;
 extern "C" {
 
 /**
@@ -1378,6 +1382,32 @@ gfxUtils::DumpAsDataURI(DrawTarget* aDT, FILE* aFile)
   }
 }
 
+/* static */ nsCString
+gfxUtils::GetAsLZ4Base64Str(DataSourceSurface* aSourceSurface)
+{
+  int32_t dataSize = aSourceSurface->GetSize().height * aSourceSurface->Stride();
+  auto compressedData = MakeUnique<char[]>(LZ4::maxCompressedSize(dataSize));
+  if (compressedData) {
+    int nDataSize = LZ4::compress((char*)aSourceSurface->GetData(),
+                                  dataSize,
+                                  compressedData.get());
+    if (nDataSize > 0) {
+      nsCString encodedImg;
+      nsresult rv = Base64Encode(Substring(compressedData.get(), nDataSize), encodedImg);
+      if (rv == NS_OK) {
+        nsCString string("");
+        string.AppendPrintf("data:image/lz4bgra;base64,%i,%i,%i,",
+                             aSourceSurface->GetSize().width,
+                             aSourceSurface->Stride(),
+                             aSourceSurface->GetSize().height);
+        string.Append(encodedImg);
+        return string;
+      }
+    }
+  }
+  return nsCString("");
+}
+
 /* static */ nsCString
 gfxUtils::GetAsDataURI(DrawTarget* aDT)
 {

gfx/thebes/gfxUtils.h

@@ -283,6 +283,7 @@ public:
     }
     static nsCString GetAsDataURI(SourceSurface* aSourceSurface);
     static nsCString GetAsDataURI(DrawTarget* aDT);
+    static nsCString GetAsLZ4Base64Str(DataSourceSurface* aSourceSurface);
 
     /**
      * Copy to the clipboard as a PNG encoded Data URL.