Added method to PixelBuffer to multiply alpha into color channels

[platform/core/uifw/dali-adaptor.git] / adaptors / common / pixel-buffer-impl.cpp

diff --git a/adaptors/common/pixel-buffer-impl.cpp b/adaptors/common/pixel-buffer-impl.cpp
index 24ea4bc..7f12bac 100644 (file)
--- a/adaptors/common/pixel-buffer-impl.cpp
+++ b/adaptors/common/pixel-buffer-impl.cpp
@@ -27,6 +27,7 @@
 #include "alpha-mask.h"
 #include "gaussian-blur.h"
 #include <platform-abstractions/portable/image-operations.h>
+#include <platform-abstractions/portable/pixel-manipulation.h>
 
 namespace Dali
 {
@@ -326,6 +327,36 @@ void PixelBuffer::ApplyGaussianBlur( const float blurRadius )
   }
 }
 
+void PixelBuffer::MultiplyColorByAlpha()
+{
+  auto bytesPerPixel = Pixel::GetBytesPerPixel( mPixelFormat );
+
+  if( Pixel::HasAlpha(mPixelFormat) )
+  {
+    unsigned char* pixel = mBuffer;
+    const unsigned int bufferSize = mWidth * mHeight;
+
+    for( unsigned int i=0; i<bufferSize; ++i )
+    {
+      unsigned int alpha = ReadChannel( pixel, mPixelFormat, Adaptor::ALPHA );
+      {
+        auto red       = ReadChannel( pixel, mPixelFormat, Adaptor::RED);
+        auto green     = ReadChannel( pixel, mPixelFormat, Adaptor::GREEN);
+        auto blue      = ReadChannel( pixel, mPixelFormat, Adaptor::BLUE);
+        auto luminance = ReadChannel( pixel, mPixelFormat, Adaptor::LUMINANCE);
+        WriteChannel( pixel, mPixelFormat, Adaptor::RED, red*alpha / 255 );
+        WriteChannel( pixel, mPixelFormat, Adaptor::GREEN, green*alpha/255 );
+        WriteChannel( pixel, mPixelFormat, Adaptor::BLUE, blue*alpha/255 );
+        WriteChannel( pixel, mPixelFormat, Adaptor::LUMINANCE, luminance*alpha/255 );
+      }
+      pixel += bytesPerPixel;
+    }
+  }
+}
+
+
+
+
 }// namespace Adaptor
 }// namespace Internal
 }// namespace Dali