...

diff --git a/MagickCore/image.c b/MagickCore/image.c
index 2d887944aa53014f5152fe49c86543bb6a9e78a2..16ee1828031ea908625317d50a5b1a957fb8b1ec 100644 (file)
--- a/MagickCore/image.c
+++ b/MagickCore/image.c
@@ -2205,6 +2205,81 @@ MagickExport MagickBooleanType ResetImagePage(Image *image,const char *page)
 %                                                                             %
 %                                                                             %
 %                                                                             %
+%   R e s e t I m a g e P i x e l s                                           %
+%                                                                             %
+%                                                                             %
+%                                                                             %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+%  ResetImagePixels() reset the image pixels, that is, all the pixel components
+%  are zereod.
+%
+%  The format of the SetImage method is:
+%
+%      MagickBooleanType ResetImagePixels(Image *image,
+%        ExceptionInfo *exception)
+%
+%  A description of each parameter follows:
+%
+%    o image: the image.
+%
+%    o exception: return any errors or warnings in this structure.
+%
+*/
+MagickExport MagickBooleanType ResetImagePixels(Image *image,
+  ExceptionInfo *exception)
+{
+  CacheView
+    *image_view;
+
+  MagickBooleanType
+    status;
+
+  ssize_t
+    y;
+
+  assert(image != (Image *) NULL);
+  if (image->debug != MagickFalse)
+    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
+  assert(image->signature == MagickCoreSignature);
+  /*
+    Reset image pixels.
+  */
+  status=MagickTrue;
+  image_view=AcquireAuthenticCacheView(image,exception);
+  for (y=0; y < (ssize_t) image->rows; y++)
+  {
+    register Quantum
+      *magick_restrict q;
+
+    register ssize_t
+      x;
+
+    if (status == MagickFalse)
+      continue;
+    q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
+    if (q == (Quantum *) NULL)
+      {
+        status=MagickFalse;
+        continue;
+      }
+    for (x=0; x < (ssize_t) image->columns; x++)
+    {
+      memset(q,0,GetPixelChannels(image)*sizeof(Quantum));
+      q+=GetPixelChannels(image);
+    }
+    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
+      status=MagickFalse;
+  }
+  image_view=DestroyCacheView(image_view);
+  return(status);
+}
+\f
+/*
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                                                                             %
+%                                                                             %
+%                                                                             %
 %     S e t I m a g e A l p h a                                               %
 %                                                                             %
 %                                                                             %

diff --git a/MagickCore/image.h b/MagickCore/image.h
index d464e1fa9c3cb53f254791b370c2fd65c52dd121..f5415ebf79c02983d877e18ef22b7a03238ea7d9 100644 (file)
--- a/MagickCore/image.h
+++ b/MagickCore/image.h
@@ -536,6 +536,7 @@ extern MagickExport MagickBooleanType
   ListMagickInfo(FILE *,ExceptionInfo *),
   ModifyImage(Image **,ExceptionInfo *),
   ResetImagePage(Image *,const char *),
+  ResetImagePixels(Image *,ExceptionInfo *),
   SetImageAlpha(Image *,const Quantum,ExceptionInfo *),
   SetImageBackgroundColor(Image *,ExceptionInfo *),
   SetImageColor(Image *,const PixelInfo *,ExceptionInfo *),

diff --git a/coders/viff.c b/coders/viff.c
index 0ce2059bd520bb08f505e7e79a1d54c8dbe77595..b7f54e415219e29ece93e786bef20cf12e03c4e4 100644 (file)
--- a/coders/viff.c
+++ b/coders/viff.c
@@ -331,6 +331,10 @@ static Image *ReadVIFFImage(const ImageInfo *image_info,
     image->rows=viff_info.columns;
     image->depth=viff_info.x_bits_per_pixel <= 8 ? 8UL :
       MAGICKCORE_QUANTUM_DEPTH;
+    status=SetImageExtent(image,image->columns,image->rows,exception);
+    if (status == MagickFalse)
+      return(DestroyImageList(image));
+    (void) SetImageBackgroundColor(image,exception);
     /*
       Verify that we can read this VIFF image.
     */
@@ -512,10 +516,6 @@ static Image *ReadVIFFImage(const ImageInfo *image_info,
       }
     if ((bytes_per_pixel*max_packets) > GetBlobSize(image))
       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
-    status=SetImageExtent(image,image->columns,image->rows,exception);
-    if (status == MagickFalse)
-      return(DestroyImageList(image));
-    (void) SetImageBackgroundColor(image,exception);
     pixels=(unsigned char *) AcquireQuantumMemory(MagickMax(number_pixels,
       max_packets),bytes_per_pixel*sizeof(*pixels));
     if (pixels == (unsigned char *) NULL)