/*
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% %
% %
% %
% G e t O n e C a c h e V i e w V i r t u a l P i x e l %
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%
% GetOneCacheViewVirtualMethodPixel() returns a single virtual pixel at
% the specified (x,y) location. The image background color is returned if an
% error occurs. If you plan to modify the pixel, use
% GetOneCacheViewAuthenticPixel() instead.
%
% The format of the GetOneCacheViewVirtualPixel method is:
%
% MagickBooleanType GetOneCacheViewVirtualMethodPixel(
% const CacheView *cache_view,
% const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
% const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o virtual_pixel_method: the virtual pixel method.
%
% o x,y: These values define the offset of the pixel.
%
% o pixel: return a pixel at the specified (x,y) location.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType GetOneCacheViewVirtualMethodPixel(
const CacheView *cache_view,const VirtualPixelMethod virtual_pixel_method,
const ssize_t x,const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
{
const PixelPacket
*pixels;
ssize_t
id;
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickSignature);
if (cache_view->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
cache_view->image->filename);
*pixel=cache_view->image->background_color;
id=GetOpenMPThreadId();
assert(id < (ssize_t) cache_view->number_threads);
pixels=GetVirtualPixelsFromNexus(cache_view->image,virtual_pixel_method,x,y,1,
1,cache_view->nexus_info[id],exception);
if (pixels == (const PixelPacket *) NULL)
return(MagickFalse);
*pixel=(*pixels);
return(MagickTrue);
}
/*
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% %
% %
% %
% G e t C a c h e V i e w V i r t u a l P i x e l s %
% %
% %
% %
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%
% GetCacheViewVirtualPixels() gets virtual pixels from the in-memory or
% disk pixel cache as defined by the geometry parameters. A pointer to the
% pixels is returned if the pixels are transferred, otherwise a NULL is
% returned.
%
% The format of the GetCacheViewVirtualPixels method is:
%
% const PixelPacket *GetCacheViewVirtualPixels(
% const CacheView *cache_view,const ssize_t x,const ssize_t y,
% const size_t columns,const size_t rows,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o x,y,columns,rows: These values define the perimeter of a region of
% pixels.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport const PixelPacket *GetCacheViewVirtualPixels(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
const size_t columns,const size_t rows,ExceptionInfo *exception)
{
const int
id = GetOpenMPThreadId();
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickSignature);
assert(id < (int) cache_view->number_threads);
return(GetVirtualPixelsFromNexus(cache_view->image,
cache_view->virtual_pixel_method,x,y,columns,rows,
cache_view->nexus_info[id],exception));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t O n e C a c h e V i e w V i r t u a l P i x e l %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetOneCacheViewVirtualPixel() returns a single pixel at the specified (x,y)
% location. The image background color is returned if an error occurs. If
% you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.
%
% The format of the GetOneCacheViewVirtualPixel method is:
%
% MagickBooleanType GetOneCacheViewVirtualPixel(
% const CacheView *cache_view,const ssize_t x,const ssize_t y,
% Quantum *pixel,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o x,y: These values define the offset of the pixel.
%
% o pixel: return a pixel at the specified (x,y) location.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType GetOneCacheViewVirtualPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,Quantum *pixel,
ExceptionInfo *exception)
{
const int
id = GetOpenMPThreadId();
register const Quantum
*magick_restrict p;
register ssize_t
i;
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickCoreSignature);
assert(id < (int) cache_view->number_threads);
(void) memset(pixel,0,MaxPixelChannels*sizeof(*pixel));
p=GetVirtualPixelsFromNexus(cache_view->image,
cache_view->virtual_pixel_method,x,y,1,1,cache_view->nexus_info[id],
exception);
if (p == (const Quantum *) NULL)
{
PixelInfo
background_color;
background_color=cache_view->image->background_color;
pixel[RedPixelChannel]=ClampToQuantum(background_color.red);
pixel[GreenPixelChannel]=ClampToQuantum(background_color.green);
pixel[BluePixelChannel]=ClampToQuantum(background_color.blue);
pixel[BlackPixelChannel]=ClampToQuantum(background_color.black);
pixel[AlphaPixelChannel]=ClampToQuantum(background_color.alpha);
return(MagickFalse);
}
for (i=0; i < (ssize_t) GetPixelChannels(cache_view->image); i++)
{
PixelChannel channel=GetPixelChannelChannel(cache_view->image,i);
pixel[channel]=p[i];
}
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t O n e C a c h e V i e w V i r t u a l P i x e l %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetOneCacheViewVirtualPixel() returns a single pixel at the specified (x,y)
% location. The image background color is returned if an error occurs. If
% you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.
%
% The format of the GetOneCacheViewVirtualPixel method is:
%
% MagickBooleanType GetOneCacheViewVirtualPixel(
% const CacheView *cache_view,const ssize_t x,const ssize_t y,
% PixelPacket *pixel,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o x,y: These values define the offset of the pixel.
%
% o pixel: return a pixel at the specified (x,y) location.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType GetOneCacheViewVirtualPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
PixelPacket *pixel,ExceptionInfo *exception)
{
const int
id = GetOpenMPThreadId();
const PixelPacket
*pixels;
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickSignature);
*pixel=cache_view->image->background_color;
assert(id < (int) cache_view->number_threads);
pixels=GetVirtualPixelsFromNexus(cache_view->image,
cache_view->virtual_pixel_method,x,y,1,1,cache_view->nexus_info[id],
exception);
if (pixels == (const PixelPacket *) NULL)
return(MagickFalse);
*pixel=(*pixels);
return(MagickTrue);
}
/*
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% %
% %
% %
% G e t O n e C a c h e V i e w V i r t u a l P i x e l I n f o %
% %
% %
% %
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%
% GetOneCacheViewVirtualPixelInfo() returns a single pixel at the specified
% (x,y) location. The image background color is returned if an error occurs.
% If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.
%
% The format of the GetOneCacheViewVirtualPixelInfo method is:
%
% MagickBooleanType GetOneCacheViewVirtualPixelInfo(
% const CacheView *cache_view,const ssize_t x,const ssize_t y,
% PixelInfo *pixel,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o x,y: These values define the offset of the pixel.
%
% o pixel: return a pixel at the specified (x,y) location.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType GetOneCacheViewVirtualPixelInfo(
const CacheView *cache_view,const ssize_t x,const ssize_t y,PixelInfo *pixel,
ExceptionInfo *exception)
{
const int
id = GetOpenMPThreadId();
register const Quantum
*magick_restrict p;
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickCoreSignature);
assert(id < (int) cache_view->number_threads);
GetPixelInfo(cache_view->image,pixel);
p=GetVirtualPixelsFromNexus(cache_view->image,
cache_view->virtual_pixel_method,x,y,1,1,cache_view->nexus_info[id],
exception);
if (p == (const Quantum *) NULL)
return(MagickFalse);
GetPixelInfoPixel(cache_view->image,p,pixel);
return(MagickTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e t C a c h e V i e w V i r t u a l P i x e l s %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetCacheViewVirtualPixels() gets virtual pixels from the in-memory or
% disk pixel cache as defined by the geometry parameters. A pointer to the
% pixels is returned if the pixels are transferred, otherwise a NULL is
% returned.
%
% The format of the GetCacheViewVirtualPixels method is:
%
% const PixelPacket *GetCacheViewVirtualPixels(
% const CacheView *cache_view,const ssize_t x,const ssize_t y,
% const size_t columns,const size_t rows,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o cache_view: the cache view.
%
% o x,y,columns,rows: These values define the perimeter of a region of
% pixels.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport const PixelPacket *GetCacheViewVirtualPixels(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
const size_t columns,const size_t rows,ExceptionInfo *exception)
{
const PixelPacket
*pixels;
ssize_t
id;
assert(cache_view != (CacheView *) NULL);
assert(cache_view->signature == MagickSignature);
if (cache_view->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
cache_view->image->filename);
id=GetOpenMPThreadId();
assert(id < (ssize_t) cache_view->number_threads);
pixels=GetVirtualPixelsFromNexus(cache_view->image,
cache_view->virtual_pixel_method,x,y,columns,rows,
cache_view->nexus_info[id],exception);
return(pixels);
}
