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ImageMagick-mirror/MagickCore/composite.c
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Dirk Lemstra 43e4dbfc7a Restored old CopyAlpha behavior.
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% CCCC OOO M M PPPP OOO SSSSS IIIII TTTTT EEEEE %
% C O O MM MM P P O O SS I T E %
% C O O M M M PPPP O O SSS I T EEE %
% C O O M M P O O SS I T E %
% CCCC OOO M M P OOO SSSSS IIIII T EEEEE %
% %
% %
% MagickCore Image Composite Methods %
% %
% Software Design %
% Cristy %
% July 1992 %
% %
% %
% Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% https://imagemagick.org/license/ %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
%
*/
/*
Include declarations.
*/
#include "MagickCore/studio.h"
#include "MagickCore/artifact.h"
#include "MagickCore/cache.h"
#include "MagickCore/cache-private.h"
#include "MagickCore/cache-view.h"
#include "MagickCore/channel.h"
#include "MagickCore/client.h"
#include "MagickCore/color.h"
#include "MagickCore/color-private.h"
#include "MagickCore/colorspace.h"
#include "MagickCore/colorspace-private.h"
#include "MagickCore/composite.h"
#include "MagickCore/composite-private.h"
#include "MagickCore/constitute.h"
#include "MagickCore/draw.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/fx.h"
#include "MagickCore/gem.h"
#include "MagickCore/geometry.h"
#include "MagickCore/image.h"
#include "MagickCore/image-private.h"
#include "MagickCore/list.h"
#include "MagickCore/log.h"
#include "MagickCore/memory_.h"
#include "MagickCore/monitor.h"
#include "MagickCore/monitor-private.h"
#include "MagickCore/morphology.h"
#include "MagickCore/option.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/property.h"
#include "MagickCore/quantum.h"
#include "MagickCore/resample.h"
#include "MagickCore/resource_.h"
#include "MagickCore/string_.h"
#include "MagickCore/string-private.h"
#include "MagickCore/thread-private.h"
#include "MagickCore/threshold.h"
#include "MagickCore/token.h"
#include "MagickCore/transform.h"
#include "MagickCore/utility.h"
#include "MagickCore/utility-private.h"
#include "MagickCore/version.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% C o m p o s i t e I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% CompositeImage() returns the second image composited onto the first
% at the specified offset, using the specified composite method.
%
% The format of the CompositeImage method is:
%
% MagickBooleanType CompositeImage(Image *image,
% const Image *source_image,const CompositeOperator compose,
% const MagickBooleanType clip_to_self,const ssize_t x_offset,
% const ssize_t y_offset,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: the canvas image, modified by he composition
%
% o source_image: the source image.
%
% o compose: This operator affects how the composite is applied to
% the image. The operators and how they are utilized are listed here
% http://www.w3.org/TR/SVG12/#compositing.
%
% o clip_to_self: set to MagickTrue to limit composition to area composed.
%
% o x_offset: the column offset of the composited image.
%
% o y_offset: the row offset of the composited image.
%
% Extra Controls from Image meta-data in 'image' (artifacts)
%
% o "compose:args"
% A string containing extra numerical arguments for specific compose
% methods, generally expressed as a 'geometry' or a comma separated list
% of numbers.
%
% Compose methods needing such arguments include "BlendCompositeOp" and
% "DisplaceCompositeOp".
%
% o exception: return any errors or warnings in this structure.
%
*/
/*
Composition based on the SVG specification:
A Composition is defined by...
Color Function : f(Sc,Dc) where Sc and Dc are the normalized colors
Blending areas : X = 1 for area of overlap, ie: f(Sc,Dc)
Y = 1 for source preserved
Z = 1 for canvas preserved
Conversion to transparency (then optimized)
Dca' = f(Sc, Dc)*Sa*Da + Y*Sca*(1-Da) + Z*Dca*(1-Sa)
Da' = X*Sa*Da + Y*Sa*(1-Da) + Z*Da*(1-Sa)
Where...
Sca = Sc*Sa normalized Source color divided by Source alpha
Dca = Dc*Da normalized Dest color divided by Dest alpha
Dc' = Dca'/Da' the desired color value for this channel.
Da' in in the follow formula as 'gamma' The resulting alpha value.
Most functions use a blending mode of over (X=1,Y=1,Z=1) this results in
the following optimizations...
gamma = Sa+Da-Sa*Da;
gamma = 1 - QuantumScale*alpha * QuantumScale*beta;
opacity = QuantumScale*alpha*beta; // over blend, optimized 1-Gamma
The above SVG definitions also define that Mathematical Composition
methods should use a 'Over' blending mode for Alpha Channel.
It however was not applied for composition modes of 'Plus', 'Minus',
the modulus versions of 'Add' and 'Subtract'.
Mathematical operator changes to be applied from IM v6.7...
1) Modulus modes 'Add' and 'Subtract' are obsoleted and renamed
'ModulusAdd' and 'ModulusSubtract' for clarity.
2) All mathematical compositions work as per the SVG specification
with regard to blending. This now includes 'ModulusAdd' and
'ModulusSubtract'.
3) When the special channel flag 'sync' (synchronize channel updates)
is turned off (enabled by default) then mathematical compositions are
only performed on the channels specified, and are applied
independently of each other. In other words the mathematics is
performed as 'pure' mathematical operations, rather than as image
operations.
*/
static Image *BlendConvolveImage(const Image *image,const char *kernel,
ExceptionInfo *exception)
{
Image
*clone_image,
*convolve_image;
KernelInfo
*kernel_info;
/*
Convolve image with a kernel.
*/
kernel_info=AcquireKernelInfo(kernel,exception);
if (kernel_info == (KernelInfo *) NULL)
return((Image *) NULL);
clone_image=CloneImage(image,0,0,MagickTrue,exception);
if (clone_image == (Image *) NULL)
{
kernel_info=DestroyKernelInfo(kernel_info);
return((Image *) NULL);
}
(void) SetImageAlphaChannel(clone_image,OffAlphaChannel,exception);
convolve_image=ConvolveImage(clone_image,kernel_info,exception);
kernel_info=DestroyKernelInfo(kernel_info);
clone_image=DestroyImage(clone_image);
return(convolve_image);
}
static Image *BlendMagnitudeImage(const Image *dx_image,const Image *dy_image,
ExceptionInfo *exception)
{
CacheView
*dx_view,
*dy_view,
*magnitude_view;
Image
*magnitude_image;
MagickBooleanType
status = MagickTrue;
ssize_t
y;
/*
Generate the magnitude between two images.
*/
magnitude_image=CloneImage(dx_image,0,0,MagickTrue,exception);
if (magnitude_image == (Image *) NULL)
return(magnitude_image);
dx_view=AcquireVirtualCacheView(dx_image,exception);
dy_view=AcquireVirtualCacheView(dy_image,exception);
magnitude_view=AcquireAuthenticCacheView(magnitude_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(dx_image,magnitude_image,dx_image->rows,1)
#endif
for (y=0; y < (ssize_t) dx_image->rows; y++)
{
const Quantum
*magick_restrict p,
*magick_restrict q;
Quantum
*magick_restrict r;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(dx_view,0,y,dx_image->columns,1,exception);
q=GetCacheViewVirtualPixels(dy_view,0,y,dx_image->columns,1,exception);
r=GetCacheViewAuthenticPixels(magnitude_view,0,y,dx_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (const Quantum *) NULL) ||
(r == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) dx_image->columns; x++)
{
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(dx_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(dx_image,i);
PixelTrait traits = GetPixelChannelTraits(dx_image,channel);
PixelTrait dy_traits = GetPixelChannelTraits(dy_image,channel);
if ((traits == UndefinedPixelTrait) ||
(dy_traits == UndefinedPixelTrait) ||
((dy_traits & UpdatePixelTrait) == 0))
continue;
r[i]=ClampToQuantum(hypot((double) p[i],(double)
GetPixelChannel(dy_image,channel,q)));
}
p+=(ptrdiff_t) GetPixelChannels(dx_image);
q+=(ptrdiff_t) GetPixelChannels(dy_image);
r+=(ptrdiff_t) GetPixelChannels(magnitude_image);
}
if (SyncCacheViewAuthenticPixels(magnitude_view,exception) == MagickFalse)
status=MagickFalse;
}
magnitude_view=DestroyCacheView(magnitude_view);
dy_view=DestroyCacheView(dy_view);
dx_view=DestroyCacheView(dx_view);
if (status == MagickFalse)
magnitude_image=DestroyImage(magnitude_image);
return(magnitude_image);
}
static Image *BlendMaxMagnitudeImage(const Image *alpha_image,
const Image *beta_image,const Image *dx_image,const Image *dy_image,
ExceptionInfo *exception)
{
CacheView
*alpha_view,
*beta_view,
*dx_view,
*dy_view,
*magnitude_view;
Image
*magnitude_image;
MagickBooleanType
status = MagickTrue;
ssize_t
y;
/*
Select the larger of two magnitudes.
*/
magnitude_image=CloneImage(alpha_image,0,0,MagickTrue,exception);
if (magnitude_image == (Image *) NULL)
return(magnitude_image);
alpha_view=AcquireVirtualCacheView(alpha_image,exception);
beta_view=AcquireVirtualCacheView(beta_image,exception);
dx_view=AcquireVirtualCacheView(dx_image,exception);
dy_view=AcquireVirtualCacheView(dy_image,exception);
magnitude_view=AcquireAuthenticCacheView(magnitude_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(alpha_image,magnitude_image,alpha_image->rows,1)
#endif
for (y=0; y < (ssize_t) alpha_image->rows; y++)
{
const Quantum
*magick_restrict p,
*magick_restrict q,
*magick_restrict r,
*magick_restrict s;
Quantum
*magick_restrict t;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(alpha_view,0,y,alpha_image->columns,1,
exception);
q=GetCacheViewVirtualPixels(beta_view,0,y,alpha_image->columns,1,exception);
r=GetCacheViewVirtualPixels(dx_view,0,y,alpha_image->columns,1,exception);
s=GetCacheViewVirtualPixels(dy_view,0,y,alpha_image->columns,1,exception);
t=GetCacheViewAuthenticPixels(magnitude_view,0,y,alpha_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (const Quantum *) NULL) ||
(r == (const Quantum *) NULL) || (s == (const Quantum *) NULL) ||
(t == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) alpha_image->columns; x++)
{
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(alpha_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(alpha_image,i);
PixelTrait traits = GetPixelChannelTraits(alpha_image,channel);
PixelTrait beta_traits = GetPixelChannelTraits(beta_image,channel);
if ((traits == UndefinedPixelTrait) ||
(beta_traits == UndefinedPixelTrait) ||
((beta_traits & UpdatePixelTrait) == 0))
continue;
if (p[i] > GetPixelChannel(beta_image,channel,q))
t[i]=GetPixelChannel(dx_image,channel,r);
else
t[i]=GetPixelChannel(dy_image,channel,s);
}
p+=(ptrdiff_t) GetPixelChannels(alpha_image);
q+=(ptrdiff_t) GetPixelChannels(beta_image);
r+=(ptrdiff_t) GetPixelChannels(dx_image);
s+=(ptrdiff_t) GetPixelChannels(dy_image);
t+=(ptrdiff_t) GetPixelChannels(magnitude_image);
}
if (SyncCacheViewAuthenticPixels(magnitude_view,exception) == MagickFalse)
status=MagickFalse;
}
magnitude_view=DestroyCacheView(magnitude_view);
dy_view=DestroyCacheView(dy_view);
dx_view=DestroyCacheView(dx_view);
beta_view=DestroyCacheView(beta_view);
alpha_view=DestroyCacheView(alpha_view);
if (status == MagickFalse)
magnitude_image=DestroyImage(magnitude_image);
return(magnitude_image);
}
static Image *BlendSumImage(const Image *alpha_image,const Image *beta_image,
const double attenuate,const double sign,ExceptionInfo *exception)
{
CacheView
*alpha_view,
*beta_view,
*sum_view;
Image
*sum_image;
MagickBooleanType
status = MagickTrue;
ssize_t
y;
/*
Add or subtract and optionally attenuate two images.
*/
sum_image=CloneImage(alpha_image,0,0,MagickTrue,exception);
if (sum_image == (Image *) NULL)
return(sum_image);
alpha_view=AcquireVirtualCacheView(alpha_image,exception);
beta_view=AcquireVirtualCacheView(beta_image,exception);
sum_view=AcquireAuthenticCacheView(sum_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(alpha_image,sum_image,alpha_image->rows,1)
#endif
for (y=0; y < (ssize_t) alpha_image->rows; y++)
{
const Quantum
*magick_restrict p,
*magick_restrict q;
Quantum
*magick_restrict r;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(alpha_view,0,y,alpha_image->columns,1,
exception);
q=GetCacheViewVirtualPixels(beta_view,0,y,alpha_image->columns,1,exception);
r=GetCacheViewAuthenticPixels(sum_view,0,y,alpha_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (const Quantum *) NULL) ||
(r == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) alpha_image->columns; x++)
{
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(alpha_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(alpha_image,i);
PixelTrait traits = GetPixelChannelTraits(alpha_image,channel);
PixelTrait beta_traits = GetPixelChannelTraits(beta_image,channel);
if ((traits == UndefinedPixelTrait) ||
(beta_traits == UndefinedPixelTrait) ||
((beta_traits & UpdatePixelTrait) == 0))
continue;
r[i]=ClampToQuantum(attenuate*((double) p[i]+sign*
(double) GetPixelChannel(beta_image,channel,q)));
}
p+=(ptrdiff_t) GetPixelChannels(alpha_image);
q+=(ptrdiff_t) GetPixelChannels(beta_image);
r+=(ptrdiff_t) GetPixelChannels(sum_image);
}
if (SyncCacheViewAuthenticPixels(sum_view,exception) == MagickFalse)
status=MagickFalse;
}
sum_view=DestroyCacheView(sum_view);
beta_view=DestroyCacheView(beta_view);
alpha_view=DestroyCacheView(alpha_view);
if (status == MagickFalse)
sum_image=DestroyImage(sum_image);
return(sum_image);
}
static Image *BlendDivergentImage(const Image *alpha_image,
const Image *beta_image,ExceptionInfo *exception)
{
#define FreeDivergentResources() \
{ \
if (dy_image != (Image *) NULL) \
dy_image=DestroyImage(dy_image); \
if (dx_image != (Image *) NULL) \
dx_image=DestroyImage(dx_image); \
if (magnitude_beta != (Image *) NULL) \
magnitude_beta=DestroyImage(magnitude_beta); \
if (dy_beta != (Image *) NULL) \
dy_beta=DestroyImage(dy_beta); \
if (dx_beta != (Image *) NULL) \
dx_beta=DestroyImage(dx_beta); \
if (magnitude_alpha != (Image *) NULL) \
magnitude_alpha=DestroyImage(magnitude_alpha); \
if (dy_alpha != (Image *) NULL) \
dy_alpha=DestroyImage(dy_alpha); \
if (dx_alpha != (Image *) NULL) \
dx_alpha=DestroyImage(dx_alpha); \
}
Image
*divergent_image = (Image *) NULL,
*dx_alpha = (Image *) NULL,
*dx_beta = (Image *) NULL,
*dx_divergent = (Image *) NULL,
*dx_image = (Image *) NULL,
*dy_alpha = (Image *) NULL,
*dy_beta = (Image *) NULL,
*dy_divergent = (Image *) NULL,
*dy_image = (Image *) NULL,
*magnitude_alpha = (Image *) NULL,
*magnitude_beta = (Image *) NULL;
/*
Create X and Y gradient images for alpha image and the magnitude.
*/
dx_alpha=BlendConvolveImage(alpha_image,"3x1:-0.5,0.0,0.5",exception);
if (dx_alpha == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
dy_alpha=BlendConvolveImage(alpha_image,"1x3:-0.5,0.0,0.5",exception);
if (dy_alpha == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
magnitude_alpha=BlendMagnitudeImage(dx_alpha,dy_alpha,exception);
if (magnitude_alpha == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
/*
Create X and Y gradient images for beta and the magnitude.
*/
dx_beta=BlendConvolveImage(beta_image,"3x1:-0.5,0.0,0.5",exception);
if (dx_beta == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
dy_beta=BlendConvolveImage(beta_image,"1x3:-0.5,0.0,0.5",exception);
if (dy_beta == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
magnitude_beta=BlendMagnitudeImage(dx_beta,dy_beta,exception);
if (magnitude_beta == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
/*
Select alpha or beta gradient for larger of two magnitudes.
*/
dx_image=BlendMaxMagnitudeImage(magnitude_alpha,magnitude_beta,dx_alpha,
dx_beta,exception);
if (dx_image == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
dy_image=BlendMaxMagnitudeImage(magnitude_alpha,magnitude_beta,dy_alpha,
dy_beta,exception);
if (dy_image == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
dx_beta=DestroyImage(dx_beta);
dx_alpha=DestroyImage(dx_alpha);
magnitude_beta=DestroyImage(magnitude_beta);
magnitude_alpha=DestroyImage(magnitude_alpha);
/*
Create divergence of gradients dx and dy and divide by 4 as guide image.
*/
dx_divergent=BlendConvolveImage(dx_image,"3x1:-0.5,0.0,0.5",exception);
if (dx_divergent == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
dy_divergent=BlendConvolveImage(dy_image,"1x3:-0.5,0.0,0.5",exception);
if (dy_divergent == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
divergent_image=BlendSumImage(dx_divergent,dy_divergent,0.25,1.0,exception);
dy_divergent=DestroyImage(dy_divergent);
dx_divergent=DestroyImage(dx_divergent);
if (divergent_image == (Image *) NULL)
{
FreeDivergentResources();
return((Image *) NULL);
}
FreeDivergentResources();
return(divergent_image);
}
static MagickBooleanType BlendMaskAlphaChannel(Image *image,
const Image *mask_image,ExceptionInfo *exception)
{
CacheView
*image_view,
*mask_view;
MagickBooleanType
status = MagickTrue;
ssize_t
y;
/*
Threshold the alpha channel.
*/
if (SetImageAlpha(image,OpaqueAlpha,exception) == MagickFalse)
return(MagickFalse);
image_view=AcquireAuthenticCacheView(image,exception);
mask_view=AcquireVirtualCacheView(mask_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(image,image,image->rows,2)
#endif
for (y=0; y < (ssize_t) image->rows; y++)
{
const Quantum
*magick_restrict p;
Quantum
*magick_restrict q;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(mask_view,0,y,image->columns,1,exception);
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) image->columns; x++)
{
Quantum
alpha = GetPixelAlpha(mask_image,p);
ssize_t
i = GetPixelChannelOffset(image,AlphaPixelChannel);
if (fabs((double) alpha) >= MagickEpsilon)
q[i]=(Quantum) 0;
p+=(ptrdiff_t) GetPixelChannels(mask_image);
q+=(ptrdiff_t) GetPixelChannels(image);
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
}
mask_view=DestroyCacheView(mask_view);
image_view=DestroyCacheView(image_view);
return(status);
}
static Image *BlendMeanImage(Image *image,const Image *mask_image,
ExceptionInfo *exception)
{
CacheView
*alpha_view,
*mask_view,
*mean_view;
double
mean[MaxPixelChannels];
Image
*mean_image;
MagickBooleanType
status = MagickTrue;
ssize_t
j,
y;
/*
Compute the mean of the image.
*/
(void) memset(mean,0,MaxPixelChannels*sizeof(*mean));
alpha_view=AcquireVirtualCacheView(image,exception);
for (y=0; y < (ssize_t) image->rows; y++)
{
const Quantum
*magick_restrict p;
ssize_t
x;
p=GetCacheViewVirtualPixels(alpha_view,0,y,image->columns,1,
exception);
if (p == (const Quantum *) NULL)
break;
for (x=0; x < (ssize_t) image->columns; x++)
{
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
{
PixelChannel channel = GetPixelChannelChannel(image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
if (traits == UndefinedPixelTrait)
continue;
mean[i]+=QuantumScale*(double) p[i];
}
p+=(ptrdiff_t) GetPixelChannels(image);
}
}
alpha_view=DestroyCacheView(alpha_view);
if (y < (ssize_t) image->rows)
return((Image *) NULL);
for (j=0; j < (ssize_t) GetPixelChannels(image); j++)
mean[j]=(double) QuantumRange*mean[j]/image->columns/
image->rows;
/*
Replace any unmasked pixels with the mean pixel.
*/
mean_image=CloneImage(image,0,0,MagickTrue,exception);
if (mean_image == (Image *) NULL)
return(mean_image);
mask_view=AcquireVirtualCacheView(mask_image,exception);
mean_view=AcquireAuthenticCacheView(mean_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(mask_image,mean_image,mean_image->rows,4)
#endif
for (y=0; y < (ssize_t) mean_image->rows; y++)
{
const Quantum
*magick_restrict p;
Quantum
*magick_restrict q;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(mask_view,0,y,mean_image->columns,1,exception);
q=GetCacheViewAuthenticPixels(mean_view,0,y,mean_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) mean_image->columns; x++)
{
Quantum
alpha = GetPixelAlpha(mask_image,p),
mask = GetPixelReadMask(mask_image,p);
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(mean_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(mean_image,i);
PixelTrait traits = GetPixelChannelTraits(mean_image,channel);
if (traits == UndefinedPixelTrait)
continue;
if (mask <= (QuantumRange/2))
q[i]=(Quantum) 0;
else
if (fabs((double) alpha) >= MagickEpsilon)
q[i]=ClampToQuantum(mean[i]);
}
p+=(ptrdiff_t) GetPixelChannels(mask_image);
q+=(ptrdiff_t) GetPixelChannels(mean_image);
}
if (SyncCacheViewAuthenticPixels(mean_view,exception) == MagickFalse)
status=MagickFalse;
}
mask_view=DestroyCacheView(mask_view);
mean_view=DestroyCacheView(mean_view);
if (status == MagickFalse)
mean_image=DestroyImage(mean_image);
return(mean_image);
}
static MagickBooleanType BlendRMSEResidual(const Image *alpha_image,
const Image *beta_image,double *residual,ExceptionInfo *exception)
{
CacheView
*alpha_view,
*beta_view;
double
area = 0.0,
channel_residual = 0.0;
MagickBooleanType
status = MagickTrue;
size_t
columns = MagickMax(alpha_image->columns,beta_image->columns),
rows = MagickMax(alpha_image->rows,beta_image->rows);
ssize_t
y;
alpha_view=AcquireVirtualCacheView(alpha_image,exception);
beta_view=AcquireVirtualCacheView(beta_image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
reduction(+:area) reduction(+:channel_residual) \
magick_number_threads(alpha_image,alpha_image,rows,1)
#endif
for (y=0; y < (ssize_t) rows; y++)
{
const Quantum
*magick_restrict p,
*magick_restrict q;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(alpha_view,0,y,columns,1,exception);
q=GetCacheViewVirtualPixels(beta_view,0,y,columns,1,exception);
if ((p == (const Quantum *) NULL) || (q == (const Quantum *) NULL))
{
status=MagickFalse;
continue;
}
channel_residual=0.0;
for (x=0; x < (ssize_t) columns; x++)
{
double
Da,
Sa;
ssize_t
i;
if ((GetPixelReadMask(alpha_image,p) <= (QuantumRange/2)) ||
(GetPixelReadMask(beta_image,q) <= (QuantumRange/2)))
{
p+=(ptrdiff_t) GetPixelChannels(alpha_image);
q+=(ptrdiff_t) GetPixelChannels(beta_image);
continue;
}
Sa=QuantumScale*(double) GetPixelAlpha(alpha_image,p);
Da=QuantumScale*(double) GetPixelAlpha(beta_image,q);
for (i=0; i < (ssize_t) GetPixelChannels(alpha_image); i++)
{
double
distance;
PixelChannel channel = GetPixelChannelChannel(alpha_image,i);
PixelTrait traits = GetPixelChannelTraits(alpha_image,channel);
PixelTrait beta_traits = GetPixelChannelTraits(beta_image,channel);
if ((traits == UndefinedPixelTrait) ||
(beta_traits == UndefinedPixelTrait) ||
((beta_traits & UpdatePixelTrait) == 0))
continue;
if (channel == AlphaPixelChannel)
distance=QuantumScale*((double) p[i]-(double) GetPixelChannel(
beta_image,channel,q));
else
distance=QuantumScale*(Sa*(double) p[i]-Da*(double) GetPixelChannel(
beta_image,channel,q));
channel_residual+=distance*distance;
}
area++;
p+=(ptrdiff_t) GetPixelChannels(alpha_image);
q+=(ptrdiff_t) GetPixelChannels(beta_image);
}
}
beta_view=DestroyCacheView(beta_view);
alpha_view=DestroyCacheView(alpha_view);
area=MagickSafeReciprocal(area);
*residual=sqrt(area*channel_residual/(double) GetImageChannels(alpha_image));
return(status);
}
static MagickBooleanType CompositeOverImage(Image *image,
const Image *source_image,const MagickBooleanType clip_to_self,
const ssize_t x_offset,const ssize_t y_offset,ExceptionInfo *exception)
{
#define CompositeImageTag "Composite/Image"
CacheView
*image_view,
*source_view;
const char
*value;
MagickBooleanType
clamp,
status;
MagickOffsetType
progress;
ssize_t
y;
/*
Composite image.
*/
status=MagickTrue;
progress=0;
clamp=MagickTrue;
value=GetImageArtifact(image,"compose:clamp");
if (value != (const char *) NULL)
clamp=IsStringTrue(value);
status=MagickTrue;
progress=0;
source_view=AcquireVirtualCacheView(source_image,exception);
image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(progress,status) \
magick_number_threads(source_image,image,image->rows,1)
#endif
for (y=0; y < (ssize_t) image->rows; y++)
{
const Quantum
*pixels;
PixelInfo
canvas_pixel,
source_pixel;
const Quantum
*magick_restrict p;
Quantum
*magick_restrict q;
ssize_t
x;
if (status == MagickFalse)
continue;
if (clip_to_self != MagickFalse)
{
if (y < y_offset)
continue;
if ((y-y_offset) >= (ssize_t) source_image->rows)
continue;
}
/*
If pixels is NULL, y is outside overlay region.
*/
pixels=(Quantum *) NULL;
p=(Quantum *) NULL;
if ((y >= y_offset) &&
((y-y_offset) < (ssize_t) source_image->rows))
{
p=GetCacheViewVirtualPixels(source_view,0,CastDoubleToSsizeT((double) y-
y_offset),source_image->columns,1,exception);
if (p == (const Quantum *) NULL)
{
status=MagickFalse;
continue;
}
pixels=p;
if (x_offset < 0)
p-=(ptrdiff_t) CastDoubleToSsizeT((double) x_offset*
GetPixelChannels(source_image));
}
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
}
GetPixelInfo(image,&canvas_pixel);
GetPixelInfo(source_image,&source_pixel);
for (x=0; x < (ssize_t) image->columns; x++)
{
double
gamma;
MagickRealType
alpha,
Da,
Dc,
Dca,
Sa,
Sc,
Sca;
ssize_t
i;
size_t
channels;
if (clip_to_self != MagickFalse)
{
if (x < x_offset)
{
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
if ((x-x_offset) >= (ssize_t) source_image->columns)
break;
}
if ((pixels == (Quantum *) NULL) || (x < x_offset) ||
((x-x_offset) >= (ssize_t) source_image->columns))
{
Quantum
source[MaxPixelChannels];
/*
Virtual composite:
Sc: source color.
Dc: canvas color.
*/
(void) GetOneVirtualPixel(source_image,
CastDoubleToSsizeT((double) x-x_offset),
CastDoubleToSsizeT((double) y-y_offset),source,exception);
for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
{
MagickRealType
pixel;
PixelChannel channel = GetPixelChannelChannel(image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
PixelTrait source_traits=GetPixelChannelTraits(source_image,
channel);
if ((traits == UndefinedPixelTrait) ||
(source_traits == UndefinedPixelTrait))
continue;
if (channel == AlphaPixelChannel)
pixel=(MagickRealType) TransparentAlpha;
else
pixel=(MagickRealType) q[i];
q[i]=clamp != MagickFalse ? ClampPixel(pixel) :
ClampToQuantum(pixel);
}
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
/*
Authentic composite:
Sa: normalized source alpha.
Da: normalized canvas alpha.
*/
Sa=QuantumScale*(double) GetPixelAlpha(source_image,p);
Da=QuantumScale*(double) GetPixelAlpha(image,q);
alpha=Sa+Da-Sa*Da;
for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
{
MagickRealType
pixel;
PixelChannel channel = GetPixelChannelChannel(image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
PixelTrait source_traits=GetPixelChannelTraits(source_image,channel);
if (traits == UndefinedPixelTrait)
continue;
if ((source_traits == UndefinedPixelTrait) &&
(channel != AlphaPixelChannel))
continue;
if (channel == AlphaPixelChannel)
{
/*
Set alpha channel.
*/
pixel=(double) QuantumRange*alpha;
q[i]=clamp != MagickFalse ? ClampPixel(pixel) :
ClampToQuantum(pixel);
continue;
}
/*
Sc: source color.
Dc: canvas color.
*/
Sc=(MagickRealType) GetPixelChannel(source_image,channel,p);
Dc=(MagickRealType) q[i];
if ((traits & CopyPixelTrait) != 0)
{
/*
Copy channel.
*/
q[i]=ClampToQuantum(Sc);
continue;
}
/*
Porter-Duff compositions:
Sca: source normalized color multiplied by alpha.
Dca: normalized canvas color multiplied by alpha.
*/
Sca=QuantumScale*Sa*Sc;
Dca=QuantumScale*Da*Dc;
gamma=MagickSafeReciprocal(alpha);
pixel=(double) QuantumRange*gamma*(Sca+Dca*(1.0-Sa));
q[i]=clamp != MagickFalse ? ClampPixel(pixel) : ClampToQuantum(pixel);
}
p+=(ptrdiff_t) GetPixelChannels(source_image);
channels=GetPixelChannels(source_image);
if (p >= (pixels+channels*source_image->columns))
p=pixels;
q+=(ptrdiff_t) GetPixelChannels(image);
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp atomic
#endif
progress++;
proceed=SetImageProgress(image,CompositeImageTag,progress,image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
source_view=DestroyCacheView(source_view);
image_view=DestroyCacheView(image_view);
return(status);
}
static MagickBooleanType SaliencyBlendImage(Image *image,
const Image *source_image,const ssize_t x_offset,const ssize_t y_offset,
const double iterations,const double residual_threshold,const size_t tick,
ExceptionInfo *exception)
{
Image
*crop_image,
*divergent_image,
*relax_image,
*residual_image = (Image *) NULL;
KernelInfo
*kernel_info;
MagickBooleanType
status = MagickTrue,
verbose = MagickFalse;
RectangleInfo
crop_info = {
source_image->columns,
source_image->rows,
x_offset,
y_offset
};
ssize_t
i;
/*
Saliency blend composite operator.
*/
crop_image=CropImage(image,&crop_info,exception);
if (crop_image == (Image *) NULL)
return(MagickFalse);
DisableCompositeClampUnlessSpecified(crop_image);
divergent_image=BlendDivergentImage(crop_image,source_image,exception);
if (divergent_image == (Image *) NULL)
{
crop_image=DestroyImage(crop_image);
return(MagickFalse);
}
(void) ResetImagePage(crop_image,"0x0+0+0");
relax_image=BlendMeanImage(crop_image,source_image,exception);
if (relax_image == (Image *) NULL)
{
crop_image=DestroyImage(crop_image);
divergent_image=DestroyImage(divergent_image);
return(MagickFalse);
}
status=BlendMaskAlphaChannel(crop_image,source_image,exception);
if (status == MagickFalse)
{
crop_image=DestroyImage(crop_image);
divergent_image=DestroyImage(divergent_image);
return(MagickFalse);
}
residual_image=CloneImage(relax_image,0,0,MagickTrue,exception);
if (residual_image == (Image *) NULL)
{
crop_image=DestroyImage(crop_image);
relax_image=DestroyImage(relax_image);
return(MagickFalse);
}
/*
Convolve relaxed image and blur area of interest.
*/
kernel_info=AcquireKernelInfo("3x3:0,0.25,0,0.25,0,0.25,0,0.25,0",exception);
if (kernel_info == (KernelInfo *) NULL)
{
crop_image=DestroyImage(crop_image);
residual_image=DestroyImage(residual_image);
relax_image=DestroyImage(relax_image);
return(MagickFalse);
}
verbose=IsStringTrue(GetImageArtifact(image,"verbose"));
if (verbose != MagickFalse)
(void) FormatLocaleFile(stderr,"saliency blending:\n");
for (i=0; i < (ssize_t) iterations; i++)
{
double
residual = 1.0;
Image
*convolve_image,
*sum_image;
convolve_image=ConvolveImage(relax_image,kernel_info,exception);
if (convolve_image == (Image *) NULL)
break;
relax_image=DestroyImage(relax_image);
relax_image=convolve_image;
sum_image=BlendSumImage(relax_image,divergent_image,1.0,-1.0,exception);
if (sum_image == (Image *) NULL)
break;
relax_image=DestroyImage(relax_image);
relax_image=sum_image;
status=CompositeOverImage(relax_image,crop_image,MagickTrue,0,0,exception);
if (status == MagickFalse)
break;
status=BlendRMSEResidual(relax_image,residual_image,&residual,exception);
if (status == MagickFalse)
break;
if ((verbose != MagickFalse) && ((i % MagickMax(tick,1)) == 0))
(void) FormatLocaleFile(stderr," %g: %g\n",(double) i,(double) residual);
if (residual < residual_threshold)
{
if (verbose != MagickFalse)
(void) FormatLocaleFile(stderr," %g: %g\n",(double) i,(double)
residual);
break;
}
residual_image=DestroyImage(residual_image);
residual_image=CloneImage(relax_image,0,0,MagickTrue,exception);
if (residual_image == (Image *) NULL)
break;
}
kernel_info=DestroyKernelInfo(kernel_info);
crop_image=DestroyImage(crop_image);
divergent_image=DestroyImage(divergent_image);
residual_image=DestroyImage(residual_image);
/*
Composite relaxed over the background image.
*/
status=CompositeOverImage(image,relax_image,MagickTrue,x_offset,y_offset,
exception);
relax_image=DestroyImage(relax_image);
return(status);
}
static MagickBooleanType SeamlessBlendImage(Image *image,
const Image *source_image,const ssize_t x_offset,const ssize_t y_offset,
const double iterations,const double residual_threshold,const size_t tick,
ExceptionInfo *exception)
{
Image
*crop_image,
*foreground_image,
*mean_image,
*relax_image,
*residual_image,
*sum_image;
KernelInfo
*kernel_info;
MagickBooleanType
status = MagickTrue,
verbose = MagickFalse;
RectangleInfo
crop_info = {
source_image->columns,
source_image->rows,
x_offset,
y_offset
};
ssize_t
i;
/*
Seamless blend composite operator.
*/
crop_image=CropImage(image,&crop_info,exception);
if (crop_image == (Image *) NULL)
return(MagickFalse);
DisableCompositeClampUnlessSpecified(crop_image);
(void) ResetImagePage(crop_image,"0x0+0+0");
sum_image=BlendSumImage(crop_image,source_image,1.0,-1.0,exception);
crop_image=DestroyImage(crop_image);
if (sum_image == (Image *) NULL)
return(MagickFalse);
mean_image=BlendMeanImage(sum_image,source_image,exception);
sum_image=DestroyImage(sum_image);
if (mean_image == (Image *) NULL)
return(MagickFalse);
relax_image=CloneImage(mean_image,0,0,MagickTrue,exception);
if (relax_image == (Image *) NULL)
{
mean_image=DestroyImage(mean_image);
return(MagickFalse);
}
status=BlendMaskAlphaChannel(mean_image,source_image,exception);
if (status == MagickFalse)
{
relax_image=DestroyImage(relax_image);
mean_image=DestroyImage(mean_image);
return(MagickFalse);
}
residual_image=CloneImage(relax_image,0,0,MagickTrue,exception);
if (residual_image == (Image *) NULL)
{
relax_image=DestroyImage(relax_image);
mean_image=DestroyImage(mean_image);
return(MagickFalse);
}
/*
Convolve relaxed image and blur area of interest.
*/
kernel_info=AcquireKernelInfo("3x3:0,0.25,0,0.25,0,0.25,0,0.25,0",exception);
if (kernel_info == (KernelInfo *) NULL)
{
residual_image=DestroyImage(residual_image);
relax_image=DestroyImage(relax_image);
mean_image=DestroyImage(mean_image);
return(MagickFalse);
}
verbose=IsStringTrue(GetImageArtifact(image,"verbose"));
if (verbose != MagickFalse)
(void) FormatLocaleFile(stderr,"seamless blending:\n");
for (i=0; i < (ssize_t) iterations; i++)
{
double
residual = 1.0;
Image
*convolve_image;
convolve_image=ConvolveImage(relax_image,kernel_info,exception);
if (convolve_image == (Image *) NULL)
break;
relax_image=DestroyImage(relax_image);
relax_image=convolve_image;
status=CompositeOverImage(relax_image,mean_image,MagickTrue,0,0,exception);
if (status == MagickFalse)
break;
status=BlendRMSEResidual(relax_image,residual_image,&residual,exception);
if (status == MagickFalse)
break;
if ((verbose != MagickFalse) && ((i % MagickMax(tick,1)) == 0))
(void) FormatLocaleFile(stderr," %g: %g\n",(double) i,(double) residual);
if (residual < residual_threshold)
{
if (verbose != MagickFalse)
(void) FormatLocaleFile(stderr," %g: %g\n",(double) i,(double)
residual);
break;
}
if (residual_image != (Image *) NULL)
residual_image=DestroyImage(residual_image);
residual_image=CloneImage(relax_image,0,0,MagickTrue,exception);
if (residual_image == (Image *) NULL)
break;
}
kernel_info=DestroyKernelInfo(kernel_info);
mean_image=DestroyImage(mean_image);
residual_image=DestroyImage(residual_image);
/*
Composite the foreground image over the background image.
*/
foreground_image=BlendSumImage(source_image,relax_image,1.0,1.0,exception);
relax_image=DestroyImage(relax_image);
if (foreground_image == (Image *) NULL)
return(MagickFalse);
(void) SetImageMask(foreground_image,ReadPixelMask,(const Image *) NULL,
exception);
status=CompositeOverImage(image,foreground_image,MagickTrue,x_offset,y_offset,
exception);
foreground_image=DestroyImage(foreground_image);
return(status);
}
MagickExport MagickBooleanType CompositeImage(Image *image,
const Image *composite,const CompositeOperator compose,
const MagickBooleanType clip_to_self,const ssize_t x_offset,
const ssize_t y_offset,ExceptionInfo *exception)
{
#define CompositeImageTag "Composite/Image"
CacheView
*source_view,
*image_view;
ColorspaceType
colorspace = HCLColorspace;
const char
*artifact;
double
white_luminance = 10000.0;
GeometryInfo
geometry_info;
IlluminantType
illuminant = D65Illuminant;
Image
*canvas_image,
*source_image;
MagickBooleanType
clamp,
compose_sync,
status;
MagickOffsetType
progress;
MagickRealType
amount,
canvas_dissolve,
midpoint,
percent_luma,
percent_chroma,
source_dissolve,
threshold;
MagickStatusType
flags;
ssize_t
y;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
assert(composite != (Image *) NULL);
assert(composite->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse)
return(MagickFalse);
source_image=CloneImage(composite,0,0,MagickTrue,exception);
if (source_image == (const Image *) NULL)
return(MagickFalse);
(void) SetImageColorspace(source_image,image->colorspace,exception);
if ((compose == OverCompositeOp) || (compose == SrcOverCompositeOp))
{
status=CompositeOverImage(image,source_image,clip_to_self,x_offset,
y_offset,exception);
source_image=DestroyImage(source_image);
return(status);
}
amount=0.5;
canvas_image=(Image *) NULL;
canvas_dissolve=1.0;
white_luminance=10000.0;
artifact=GetImageArtifact(image,"compose:white-luminance");
if (artifact != (const char *) NULL)
white_luminance=StringToDouble(artifact,(char **) NULL);
artifact=GetImageArtifact(image,"compose:illuminant");
if (artifact != (const char *) NULL)
{
ssize_t
illuminant_type;
illuminant_type=ParseCommandOption(MagickIlluminantOptions,MagickFalse,
artifact);
if (illuminant_type < 0)
illuminant=UndefinedIlluminant;
else
illuminant=(IlluminantType) illuminant_type;
}
artifact=GetImageArtifact(image,"compose:colorspace");
if (artifact != (const char *) NULL)
{
ssize_t
colorspace_type;
colorspace_type=ParseCommandOption(MagickColorspaceOptions,MagickFalse,
artifact);
if (colorspace_type < 0)
colorspace=UndefinedColorspace;
else
colorspace=(ColorspaceType) colorspace_type;
}
clamp=MagickTrue;
artifact=GetImageArtifact(image,"compose:clamp");
if (artifact != (const char *) NULL)
clamp=IsStringTrue(artifact);
compose_sync=MagickTrue;
artifact=GetImageArtifact(image,"compose:sync");
if (artifact != (const char *) NULL)
compose_sync=IsStringTrue(artifact);
SetGeometryInfo(&geometry_info);
percent_luma=100.0;
percent_chroma=100.0;
source_dissolve=1.0;
threshold=0.05f;
switch (compose)
{
case CopyCompositeOp:
{
if ((x_offset < 0) || (y_offset < 0))
break;
if ((x_offset+(ssize_t) source_image->columns) > (ssize_t) image->columns)
break;
if ((y_offset+(ssize_t) source_image->rows) > (ssize_t) image->rows)
break;
if ((source_image->alpha_trait == UndefinedPixelTrait) &&
(image->alpha_trait != UndefinedPixelTrait))
(void) SetImageAlphaChannel(source_image,OpaqueAlphaChannel,exception);
status=MagickTrue;
source_view=AcquireVirtualCacheView(source_image,exception);
image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(source_image,image,source_image->rows,4)
#endif
for (y=0; y < (ssize_t) source_image->rows; y++)
{
MagickBooleanType
sync;
const Quantum
*p;
Quantum
*q;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
exception);
q=GetCacheViewAuthenticPixels(image_view,x_offset,y+y_offset,
source_image->columns,1,exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) source_image->columns; x++)
{
ssize_t
i;
if (GetPixelReadMask(source_image,p) <= (QuantumRange/2))
{
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
for (i=0; i < (ssize_t) GetPixelChannels(source_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(source_image,i);
PixelTrait source_traits = GetPixelChannelTraits(source_image,
channel);
PixelTrait traits = GetPixelChannelTraits(image,channel);
if ((source_traits == UndefinedPixelTrait) ||
(traits == UndefinedPixelTrait))
continue;
SetPixelChannel(image,channel,p[i],q);
}
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(image);
}
sync=SyncCacheViewAuthenticPixels(image_view,exception);
if (sync == MagickFalse)
status=MagickFalse;
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
proceed=SetImageProgress(image,CompositeImageTag,(MagickOffsetType)
y,image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
source_view=DestroyCacheView(source_view);
image_view=DestroyCacheView(image_view);
source_image=DestroyImage(source_image);
return(status);
}
case IntensityCompositeOp:
{
if ((x_offset < 0) || (y_offset < 0))
break;
if ((x_offset+(ssize_t) source_image->columns) > (ssize_t) image->columns)
break;
if ((y_offset+(ssize_t) source_image->rows) > (ssize_t) image->rows)
break;
status=MagickTrue;
source_view=AcquireVirtualCacheView(source_image,exception);
image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(source_image,image,source_image->rows,4)
#endif
for (y=0; y < (ssize_t) source_image->rows; y++)
{
MagickBooleanType
sync;
const Quantum
*p;
Quantum
*q;
ssize_t
x;
if (status == MagickFalse)
continue;
p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
exception);
q=GetCacheViewAuthenticPixels(image_view,x_offset,y+y_offset,
source_image->columns,1,exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) source_image->columns; x++)
{
if (GetPixelReadMask(source_image,p) <= (QuantumRange/2))
{
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
SetPixelAlpha(image,clamp != MagickFalse ?
ClampPixel(GetPixelIntensity(source_image,p)) :
ClampToQuantum(GetPixelIntensity(source_image,p)),q);
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(image);
}
sync=SyncCacheViewAuthenticPixels(image_view,exception);
if (sync == MagickFalse)
status=MagickFalse;
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
proceed=SetImageProgress(image,CompositeImageTag,(MagickOffsetType)
y,image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
source_view=DestroyCacheView(source_view);
image_view=DestroyCacheView(image_view);
source_image=DestroyImage(source_image);
return(status);
}
case CopyAlphaCompositeOp:
case ChangeMaskCompositeOp:
{
/*
Modify canvas outside the overlaid region and require an alpha
channel to exist, to add transparency.
*/
if ((image->alpha_trait & BlendPixelTrait) == 0)
(void) SetImageAlphaChannel(image,OpaqueAlphaChannel,exception);
break;
}
case BlurCompositeOp:
{
CacheView
*canvas_view;
double
angle_range,
angle_start,
height,
width;
PixelInfo
pixel;
ResampleFilter
*resample_filter;
SegmentInfo
blur;
/*
Blur Image by resampling dictated by an overlay gradient map:
X = red_channel; Y = green_channel; compose:args =
x_scale[,y_scale[,angle]].
*/
canvas_image=CloneImage(image,0,0,MagickTrue,exception);
if (canvas_image == (Image *) NULL)
{
source_image=DestroyImage(source_image);
return(MagickFalse);
}
/*
Gather the maximum blur sigma values from user.
*/
flags=NoValue;
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (const char *) NULL)
flags=ParseGeometry(artifact,&geometry_info);
if ((flags & WidthValue) == 0)
{
(void) ThrowMagickException(exception,GetMagickModule(),OptionWarning,
"InvalidSetting","'%s' '%s'","compose:args",artifact);
source_image=DestroyImage(source_image);
canvas_image=DestroyImage(canvas_image);
return(MagickFalse);
}
/*
Users input sigma now needs to be converted to the EWA ellipse size.
The filter defaults to a sigma of 0.5 so to make this match the users
input the ellipse size needs to be doubled.
*/
width=2.0*geometry_info.rho;
height=width;
if ((flags & HeightValue) != 0)
height=2.0*geometry_info.sigma;
/*
Default the unrotated ellipse width and height axis vectors.
*/
blur.x1=width;
blur.x2=0.0;
blur.y1=0.0;
blur.y2=height;
if ((flags & XValue) != 0 )
{
MagickRealType
angle;
/*
Rotate vectors if a rotation angle is given.
*/
angle=DegreesToRadians(geometry_info.xi);
blur.x1=width*cos(angle);
blur.x2=width*sin(angle);
blur.y1=(-height*sin(angle));
blur.y2=height*cos(angle);
}
angle_start=0.0;
angle_range=0.0;
if ((flags & YValue) != 0 )
{
/*
Lets set a angle range and calculate in the loop.
*/
angle_start=DegreesToRadians(geometry_info.xi);
angle_range=DegreesToRadians(geometry_info.psi)-angle_start;
}
/*
Set up a gaussian cylindrical filter for EWA Blurring.
As the minimum ellipse radius of support*1.0 the EWA algorithm
can only produce a minimum blur of 0.5 for Gaussian (support=2.0)
This means that even 'No Blur' will be still a little blurry! The
solution (as well as the problem of preventing any user expert filter
settings, is to set our own user settings, restore them afterwards.
*/
resample_filter=AcquireResampleFilter(image,exception);
SetResampleFilter(resample_filter,GaussianFilter);
/*
Perform the variable blurring of each pixel in image.
*/
GetPixelInfo(image,&pixel);
source_view=AcquireVirtualCacheView(source_image,exception);
canvas_view=AcquireAuthenticCacheView(canvas_image,exception);
for (y=0; y < (ssize_t) source_image->rows; y++)
{
MagickBooleanType
sync;
const Quantum
*magick_restrict p;
Quantum
*magick_restrict q;
ssize_t
x;
if (((y+y_offset) < 0) || ((y+y_offset) >= (ssize_t) image->rows))
continue;
p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
exception);
q=QueueCacheViewAuthenticPixels(canvas_view,0,y,canvas_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
break;
for (x=0; x < (ssize_t) source_image->columns; x++)
{
if (((x_offset+x) < 0) || ((x_offset+x) >= (ssize_t) image->columns))
{
p+=(ptrdiff_t) GetPixelChannels(source_image);
continue;
}
if (fabs(angle_range) > MagickEpsilon)
{
MagickRealType
angle;
angle=angle_start+angle_range*QuantumScale*(double)
GetPixelBlue(source_image,p);
blur.x1=width*cos(angle);
blur.x2=width*sin(angle);
blur.y1=(-height*sin(angle));
blur.y2=height*cos(angle);
}
ScaleResampleFilter(resample_filter,
blur.x1*QuantumScale*(double) GetPixelRed(source_image,p),
blur.y1*QuantumScale*(double) GetPixelGreen(source_image,p),
blur.x2*QuantumScale*(double) GetPixelRed(source_image,p),
blur.y2*QuantumScale*(double) GetPixelGreen(source_image,p) );
(void) ResamplePixelColor(resample_filter,(double) x_offset+x,
(double) y_offset+y,&pixel,exception);
SetPixelViaPixelInfo(canvas_image,&pixel,q);
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(canvas_image);
}
sync=SyncCacheViewAuthenticPixels(canvas_view,exception);
if (sync == MagickFalse)
break;
}
resample_filter=DestroyResampleFilter(resample_filter);
source_view=DestroyCacheView(source_view);
canvas_view=DestroyCacheView(canvas_view);
source_image=DestroyImage(source_image);
source_image=canvas_image;
break;
}
case DisplaceCompositeOp:
case DistortCompositeOp:
{
CacheView
*canvas_view;
MagickRealType
horizontal_scale,
vertical_scale;
PixelInfo
pixel;
PointInfo
center,
offset;
/*
Displace/Distort based on overlay gradient map:
X = red_channel; Y = green_channel;
compose:args = x_scale[,y_scale[,center.x,center.y]]
*/
canvas_image=CloneImage(image,0,0,MagickTrue,exception);
if (canvas_image == (Image *) NULL)
{
source_image=DestroyImage(source_image);
return(MagickFalse);
}
SetGeometryInfo(&geometry_info);
flags=NoValue;
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
flags=ParseGeometry(artifact,&geometry_info);
if ((flags & (WidthValue | HeightValue)) == 0 )
{
if ((flags & AspectValue) == 0)
{
horizontal_scale=(MagickRealType) (source_image->columns-1)/2.0;
vertical_scale=(MagickRealType) (source_image->rows-1)/2.0;
}
else
{
horizontal_scale=(MagickRealType) (image->columns-1)/2.0;
vertical_scale=(MagickRealType) (image->rows-1)/2.0;
}
}
else
{
horizontal_scale=geometry_info.rho;
vertical_scale=geometry_info.sigma;
if ((flags & PercentValue) != 0)
{
if ((flags & AspectValue) == 0)
{
horizontal_scale*=(source_image->columns-1)/200.0;
vertical_scale*=(source_image->rows-1)/200.0;
}
else
{
horizontal_scale*=(image->columns-1)/200.0;
vertical_scale*=(image->rows-1)/200.0;
}
}
if ((flags & HeightValue) == 0)
vertical_scale=horizontal_scale;
}
/*
Determine fixed center point for absolute distortion map
Absolute distort ==
Displace offset relative to a fixed absolute point
Select that point according to +X+Y user inputs.
default = center of overlay image
arg flag '!' = locations/percentage relative to background image
*/
center.x=(MagickRealType) x_offset;
center.y=(MagickRealType) y_offset;
if (compose == DistortCompositeOp)
{
if ((flags & XValue) == 0)
if ((flags & AspectValue) != 0)
center.x=(MagickRealType) ((image->columns-1)/2.0);
else
center.x=(MagickRealType) (x_offset+(source_image->columns-1)/
2.0);
else
if ((flags & AspectValue) != 0)
center.x=geometry_info.xi;
else
center.x=(MagickRealType) (x_offset+geometry_info.xi);
if ((flags & YValue) == 0)
if ((flags & AspectValue) != 0)
center.y=(MagickRealType) ((image->rows-1)/2.0);
else
center.y=(MagickRealType) (y_offset+(source_image->rows-1)/2.0);
else
if ((flags & AspectValue) != 0)
center.y=geometry_info.psi;
else
center.y=(MagickRealType) (y_offset+geometry_info.psi);
}
/*
Shift the pixel offset point as defined by the provided,
displacement/distortion map. -- Like a lens...
*/
GetPixelInfo(image,&pixel);
image_view=AcquireVirtualCacheView(image,exception);
source_view=AcquireVirtualCacheView(source_image,exception);
canvas_view=AcquireAuthenticCacheView(canvas_image,exception);
for (y=0; y < (ssize_t) source_image->rows; y++)
{
MagickBooleanType
sync;
const Quantum
*magick_restrict p;
Quantum
*magick_restrict q;
ssize_t
x;
if (((y+y_offset) < 0) || ((y+y_offset) >= (ssize_t) image->rows))
continue;
p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
exception);
q=QueueCacheViewAuthenticPixels(canvas_view,0,y,canvas_image->columns,1,
exception);
if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
break;
for (x=0; x < (ssize_t) source_image->columns; x++)
{
if (((x_offset+x) < 0) || ((x_offset+x) >= (ssize_t) image->columns))
{
p+=(ptrdiff_t) GetPixelChannels(source_image);
continue;
}
/*
Displace the offset.
*/
offset.x=(double) (horizontal_scale*((double) GetPixelRed(
source_image,p)-(((MagickRealType) QuantumRange+1.0)/2.0)))/
(((MagickRealType) QuantumRange+1.0)/2.0)+center.x+
((compose == DisplaceCompositeOp) ? x : 0);
offset.y=(double) (vertical_scale*((double) GetPixelGreen(
source_image,p)-(((MagickRealType) QuantumRange+1.0)/2.0)))/
(((MagickRealType) QuantumRange+1.0)/2.0)+center.y+
((compose == DisplaceCompositeOp) ? y : 0);
status=InterpolatePixelInfo(image,image_view,
UndefinedInterpolatePixel,(double) offset.x,(double) offset.y,
&pixel,exception);
if (status == MagickFalse)
break;
/*
Mask with the 'invalid pixel mask' in alpha channel.
*/
pixel.alpha=(MagickRealType) QuantumRange*(QuantumScale*pixel.alpha)*
(QuantumScale*(double) GetPixelAlpha(source_image,p));
SetPixelViaPixelInfo(canvas_image,&pixel,q);
p+=(ptrdiff_t) GetPixelChannels(source_image);
q+=(ptrdiff_t) GetPixelChannels(canvas_image);
}
if (x < (ssize_t) source_image->columns)
break;
sync=SyncCacheViewAuthenticPixels(canvas_view,exception);
if (sync == MagickFalse)
break;
}
canvas_view=DestroyCacheView(canvas_view);
source_view=DestroyCacheView(source_view);
image_view=DestroyCacheView(image_view);
source_image=DestroyImage(source_image);
source_image=canvas_image;
break;
}
case DissolveCompositeOp:
{
/*
Geometry arguments to dissolve factors.
*/
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
source_dissolve=geometry_info.rho/100.0;
canvas_dissolve=1.0;
if ((source_dissolve-MagickEpsilon) < 0.0)
source_dissolve=0.0;
if ((source_dissolve+MagickEpsilon) > 1.0)
{
canvas_dissolve=2.0-source_dissolve;
source_dissolve=1.0;
}
if ((flags & SigmaValue) != 0)
canvas_dissolve=geometry_info.sigma/100.0;
if ((canvas_dissolve-MagickEpsilon) < 0.0)
canvas_dissolve=0.0;
if ((canvas_dissolve+MagickEpsilon) > 1.0)
canvas_dissolve=1.0;
}
break;
}
case BlendCompositeOp:
{
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
source_dissolve=geometry_info.rho/100.0;
canvas_dissolve=1.0-source_dissolve;
if ((flags & SigmaValue) != 0)
canvas_dissolve=geometry_info.sigma/100.0;
}
break;
}
case SaliencyBlendCompositeOp:
{
double
residual_threshold = 0.0002,
iterations = 400.0;
size_t
tick = 100;
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
iterations=geometry_info.rho;
if ((flags & SigmaValue) != 0)
residual_threshold=geometry_info.sigma;
if ((flags & XiValue) != 0)
tick=(size_t) geometry_info.xi;
}
status=SaliencyBlendImage(image,composite,x_offset,y_offset,iterations,
residual_threshold,tick,exception);
source_image=DestroyImage(source_image);
return(status);
}
case SeamlessBlendCompositeOp:
{
double
residual_threshold = 0.0002,
iterations = 400.0;
size_t
tick = 100;
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
iterations=geometry_info.rho;
if ((flags & SigmaValue) != 0)
residual_threshold=geometry_info.sigma;
if ((flags & XiValue) != 0)
tick=(size_t) geometry_info.xi;
}
status=SeamlessBlendImage(image,composite,x_offset,y_offset,iterations,
residual_threshold,tick,exception);
source_image=DestroyImage(source_image);
return(status);
}
case MathematicsCompositeOp:
{
/*
Just collect the values from "compose:args", setting.
Unused values are set to zero automagically.
Arguments are normally a comma separated list, so this probably should
be changed to some 'general comma list' parser, (with a minimum
number of values)
*/
SetGeometryInfo(&geometry_info);
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
if (flags == NoValue)
(void) ThrowMagickException(exception,GetMagickModule(),OptionError,
"InvalidGeometry","`%s'",artifact);
}
break;
}
case ModulateCompositeOp:
{
/*
Determine the luma and chroma scale.
*/
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
percent_luma=geometry_info.rho;
if ((flags & SigmaValue) != 0)
percent_chroma=geometry_info.sigma;
}
break;
}
case ThresholdCompositeOp:
{
/*
Determine the amount and threshold.
*/
artifact=GetImageArtifact(image,"compose:args");
if (artifact != (char *) NULL)
{
flags=ParseGeometry(artifact,&geometry_info);
amount=geometry_info.rho;
threshold=geometry_info.sigma;
if ((flags & SigmaValue) == 0)
threshold=0.05f;
}
threshold*=(double) QuantumRange;
break;
}
default:
break;
}
/*
Composite image.
*/
status=MagickTrue;
progress=0;
midpoint=((MagickRealType) QuantumRange+1.0)/2;
source_view=AcquireVirtualCacheView(source_image,exception);
image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(progress,status) \
magick_number_threads(source_image,image,image->rows,1)
#endif
for (y=0; y < (ssize_t) image->rows; y++)
{
const Quantum
*magick_restrict p,
*pixels;
MagickRealType
blue = 0.0,
chroma = 0.0,
green = 0.0,
hue = 0.0,
luma = 0.0,
red = 0.0;
PixelInfo
canvas_pixel,
source_pixel;
Quantum
*magick_restrict q;
ssize_t
x;
if (status == MagickFalse)
continue;
if (clip_to_self != MagickFalse)
{
if (y < y_offset)
continue;
if ((y-y_offset) >= (ssize_t) source_image->rows)
continue;
}
/*
If pixels is NULL, y is outside overlay region.
*/
pixels=(Quantum *) NULL;
p=(Quantum *) NULL;
if ((y >= y_offset) &&
((y-y_offset) < (ssize_t) source_image->rows))
{
p=GetCacheViewVirtualPixels(source_view,0,
CastDoubleToSsizeT((double) y-y_offset),source_image->columns,1,
exception);
if (p == (const Quantum *) NULL)
{
status=MagickFalse;
continue;
}
pixels=p;
if (x_offset < 0)
p-=(ptrdiff_t) CastDoubleToSsizeT((double) x_offset*
GetPixelChannels(source_image));
}
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
}
GetPixelInfo(image,&canvas_pixel);
GetPixelInfo(source_image,&source_pixel);
for (x=0; x < (ssize_t) image->columns; x++)
{
double
gamma = 0.0;
MagickRealType
alpha = 0.0,
blend = 0.0,
D = 0.0,
Da = 0.0,
Dc = 0.0,
Dca = 0.0,
Di = 0.0,
S = 0.0,
Sa = 0.0,
Sc = 0.0,
Sca = 0.0,
Si = 0.0;
size_t
channels;
ssize_t
i;
if (clip_to_self != MagickFalse)
{
if (x < x_offset)
{
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
if ((x-x_offset) >= (ssize_t) source_image->columns)
break;
}
if ((pixels == (Quantum *) NULL) || (x < x_offset) ||
((x-x_offset) >= (ssize_t) source_image->columns))
{
Quantum
source[MaxPixelChannels];
/*
Virtual composite:
Sc: source color.
Dc: canvas color.
*/
(void) GetOneVirtualPixel(source_image,
CastDoubleToSsizeT((double) x-x_offset),
CastDoubleToSsizeT((double) y-y_offset),source,exception);
for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
{
MagickRealType
pixel = 0.0;
PixelChannel channel = GetPixelChannelChannel(image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
PixelTrait source_traits = GetPixelChannelTraits(source_image,
channel);
if ((traits == UndefinedPixelTrait) ||
(source_traits == UndefinedPixelTrait))
continue;
switch (compose)
{
case AlphaCompositeOp:
case ChangeMaskCompositeOp:
case CopyAlphaCompositeOp:
case DstAtopCompositeOp:
case DstInCompositeOp:
case InCompositeOp:
case OutCompositeOp:
case SrcInCompositeOp:
case SrcOutCompositeOp:
{
if (channel == AlphaPixelChannel)
pixel=(MagickRealType) TransparentAlpha;
else
pixel=(MagickRealType) q[i];
break;
}
case ClearCompositeOp:
case CopyCompositeOp:
case ReplaceCompositeOp:
{
if (channel == AlphaPixelChannel)
pixel=(MagickRealType) TransparentAlpha;
else
pixel=0.0;
break;
}
case BlendCompositeOp:
case DissolveCompositeOp:
{
if (channel == AlphaPixelChannel)
pixel=canvas_dissolve*(double) GetPixelAlpha(source_image,
source);
else
pixel=(MagickRealType) source[channel];
break;
}
default:
{
pixel=(MagickRealType) source[channel];
break;
}
}
q[i]=clamp != MagickFalse ? ClampPixel(pixel) :
ClampToQuantum(pixel);
}
q+=(ptrdiff_t) GetPixelChannels(image);
continue;
}
/*
Authentic composite:
Sa: normalized source alpha.
Da: normalized canvas alpha.
*/
Sa=QuantumScale*(double) GetPixelAlpha(source_image,p);
Da=QuantumScale*(double) GetPixelAlpha(image,q);
switch (compose)
{
case BumpmapCompositeOp:
case ColorBurnCompositeOp:
case ColorDodgeCompositeOp:
case DarkenCompositeOp:
case DifferenceCompositeOp:
case DivideDstCompositeOp:
case DivideSrcCompositeOp:
case ExclusionCompositeOp:
case FreezeCompositeOp:
case HardLightCompositeOp:
case HardMixCompositeOp:
case InterpolateCompositeOp:
case LightenCompositeOp:
case LinearBurnCompositeOp:
case LinearDodgeCompositeOp:
case LinearLightCompositeOp:
case MathematicsCompositeOp:
case MinusDstCompositeOp:
case MinusSrcCompositeOp:
case MultiplyCompositeOp:
case NegateCompositeOp:
case OverlayCompositeOp:
case PegtopLightCompositeOp:
case PinLightCompositeOp:
case ReflectCompositeOp:
case ScreenCompositeOp:
case SoftBurnCompositeOp:
case SoftDodgeCompositeOp:
case SoftLightCompositeOp:
case StampCompositeOp:
case VividLightCompositeOp:
{
alpha=RoundToUnity(Sa+Da-Sa*Da);
break;
}
case DstAtopCompositeOp:
case DstInCompositeOp:
case InCompositeOp:
case SrcInCompositeOp:
{
alpha=Sa*Da;
break;
}
case DissolveCompositeOp:
{
alpha=source_dissolve*Sa*(-canvas_dissolve*Da)+source_dissolve*Sa+
canvas_dissolve*Da;
break;
}
case DstOverCompositeOp:
case OverCompositeOp:
case SrcOverCompositeOp:
{
alpha=Sa+Da-Sa*Da;
break;
}
case DstOutCompositeOp:
{
alpha=Da*(1.0-Sa);
break;
}
case OutCompositeOp:
case SrcOutCompositeOp:
{
alpha=Sa*(1.0-Da);
break;
}
case BlendCompositeOp:
case PlusCompositeOp:
{
alpha=RoundToUnity(source_dissolve*Sa+canvas_dissolve*Da);
break;
}
case XorCompositeOp:
{
alpha=Sa+Da-2.0*Sa*Da;
break;
}
case ModulusAddCompositeOp:
{
if ((Sa+Da) <= 1.0)
{
alpha=(Sa+Da);
break;
}
alpha=((Sa+Da)-1.0);
break;
}
case ModulusSubtractCompositeOp:
{
if ((Sa-Da) >= 0.0)
{
alpha=(Sa-Da);
break;
}
alpha=((Sa-Da)+1.0);
break;
}
default:
{
alpha=1.0;
break;
}
}
switch (compose)
{
case ColorizeCompositeOp:
case HueCompositeOp:
case LuminizeCompositeOp:
case ModulateCompositeOp:
case RMSECompositeOp:
case SaturateCompositeOp:
{
Si=GetPixelIntensity(source_image,p);
GetPixelInfoPixel(source_image,p,&source_pixel);
GetPixelInfoPixel(image,q,&canvas_pixel);
break;
}
case BumpmapCompositeOp:
case CopyAlphaCompositeOp:
case DarkenIntensityCompositeOp:
case LightenIntensityCompositeOp:
{
Si=GetPixelIntensity(source_image,p);
Di=GetPixelIntensity(image,q);
break;
}
default:
break;
}
for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
{
MagickRealType
pixel = 0.0,
sans = 0.0;
PixelChannel channel = GetPixelChannelChannel(image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
PixelTrait source_traits = GetPixelChannelTraits(source_image,channel);
if (traits == UndefinedPixelTrait)
continue;
if ((channel == AlphaPixelChannel) &&
((traits & UpdatePixelTrait) != 0))
{
/*
Set alpha channel.
*/
switch (compose)
{
case AlphaCompositeOp:
{
pixel=(double) QuantumRange*Sa;
break;
}
case AtopCompositeOp:
case CopyBlackCompositeOp:
case CopyBlueCompositeOp:
case CopyCyanCompositeOp:
case CopyGreenCompositeOp:
case CopyMagentaCompositeOp:
case CopyRedCompositeOp:
case CopyYellowCompositeOp:
case SrcAtopCompositeOp:
case DstCompositeOp:
case NoCompositeOp:
{
pixel=(double) QuantumRange*Da;
break;
}
case BumpmapCompositeOp:
{
pixel=Si*Da;
break;
}
case ChangeMaskCompositeOp:
{
if (IsFuzzyEquivalencePixel(source_image,p,image,q) != MagickFalse)
pixel=(MagickRealType) TransparentAlpha;
else
pixel=(double) QuantumRange*Da;
break;
}
case ClearCompositeOp:
{
pixel=(MagickRealType) TransparentAlpha;
break;
}
case ColorizeCompositeOp:
case HueCompositeOp:
case LuminizeCompositeOp:
case RMSECompositeOp:
case SaturateCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=(double) QuantumRange*Da;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=(double) QuantumRange*Sa;
break;
}
if (Sa < Da)
{
pixel=(double) QuantumRange*Da;
break;
}
pixel=(double) QuantumRange*Sa;
break;
}
case CopyAlphaCompositeOp:
{
if (source_image->alpha_trait == UndefinedPixelTrait)
pixel=Si;
else
pixel=(double) QuantumRange*Sa;
break;
}
case BlurCompositeOp:
case CopyCompositeOp:
case DisplaceCompositeOp:
case DistortCompositeOp:
case DstAtopCompositeOp:
case ReplaceCompositeOp:
case SrcCompositeOp:
{
pixel=(double) QuantumRange*Sa;
break;
}
case DarkenIntensityCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=Si < Di ? Sa : Da;
break;
}
pixel=Sa*Si < Da*Di ? Sa : Da;
break;
}
case DifferenceCompositeOp:
{
pixel=(double) QuantumRange*fabs((double) (Sa-Da));
break;
}
case FreezeCompositeOp:
{
pixel=(double) QuantumRange*(1.0-(1.0-Sa)*(1.0-Sa)*
MagickSafeReciprocal(Da));
if (pixel < 0.0)
pixel=0.0;
break;
}
case InterpolateCompositeOp:
{
pixel=(double) QuantumRange*(0.5-0.25*cos(MagickPI*Sa)-0.25*
cos(MagickPI*Da));
break;
}
case LightenIntensityCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=Si > Di ? Sa : Da;
break;
}
pixel=Sa*Si > Da*Di ? Sa : Da;
break;
}
case ModulateCompositeOp:
{
pixel=(double) QuantumRange*Da;
break;
}
case MultiplyCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(double) QuantumRange*Sa*Da;
break;
}
pixel=(double) QuantumRange*alpha;
break;
}
case NegateCompositeOp:
{
pixel=(double) QuantumRange*((1.0-Sa-Da));
break;
}
case ReflectCompositeOp:
{
pixel=(double) QuantumRange*(Sa*Sa*
MagickSafeReciprocal(1.0-Da));
if (pixel > (double) QuantumRange)
pixel=(double) QuantumRange;
break;
}
case StampCompositeOp:
{
pixel=(double) QuantumRange*(Sa+Da*Da-1.0);
break;
}
case StereoCompositeOp:
{
pixel=(double) QuantumRange*(Sa+Da)/2;
break;
}
default:
{
pixel=(double) QuantumRange*alpha;
break;
}
}
q[i]=clamp != MagickFalse ? ClampPixel(pixel) :
ClampToQuantum(pixel);
continue;
}
if (source_traits == UndefinedPixelTrait)
continue;
/*
Sc: source color.
Dc: canvas color.
*/
Sc=(MagickRealType) GetPixelChannel(source_image,channel,p);
Dc=(MagickRealType) q[i];
if ((traits & CopyPixelTrait) != 0)
{
/*
Copy channel.
*/
q[i]=ClampToQuantum(Dc);
continue;
}
/*
Porter-Duff compositions:
Sca: source normalized color multiplied by alpha.
Dca: normalized canvas color multiplied by alpha.
*/
Sca=QuantumScale*Sa*Sc;
Dca=QuantumScale*Da*Dc;
switch (compose)
{
case DarkenCompositeOp:
case LightenCompositeOp:
case ModulusSubtractCompositeOp:
{
gamma=MagickSafeReciprocal(1.0-alpha);
break;
}
default:
{
gamma=MagickSafeReciprocal(alpha);
break;
}
}
pixel=Dc;
switch (compose)
{
case AlphaCompositeOp:
{
pixel=(double) QuantumRange*Sa;
break;
}
case AtopCompositeOp:
case SrcAtopCompositeOp:
{
pixel=(double) QuantumRange*(Sca*Da+Dca*(1.0-Sa));
break;
}
case BlendCompositeOp:
{
pixel=gamma*(source_dissolve*Sa*Sc+canvas_dissolve*Da*Dc);
break;
}
case CopyCompositeOp:
case ReplaceCompositeOp:
{
pixel=(double) QuantumRange*Sca;
break;
}
case BlurCompositeOp:
case DisplaceCompositeOp:
case DistortCompositeOp:
case SrcCompositeOp:
{
pixel=Sc;
break;
}
case BumpmapCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
pixel=(QuantumScale*Si)*Dc;
break;
}
case ChangeMaskCompositeOp:
{
pixel=Dc;
break;
}
case ClearCompositeOp:
{
pixel=0.0;
break;
}
case ColorBurnCompositeOp:
{
D=(Da > 0.0) ? RoundToUnity(Dca/Da) : 0.0;
S=(Sa > 0.0) ? RoundToUnity(Sca/Sa) : 0.0;
if (S <= 0.0)
blend=0.0;
else
blend=1.0-(1.0-D)/S;
pixel=(double) QuantumRange*gamma*RoundToUnity(Sa*Da*
RoundToUnity(blend)+Sa*(1.0-Da)*S+Da*(1.0-Sa)*D);
break;
}
case ColorDodgeCompositeOp:
{
if (Sa > 0.0)
S=RoundToUnity(Sca/Sa);
else
S=0.0;
if (Da > 0.0)
D=RoundToUnity(Dca/Da);
else
D=0.0;
if (S >= 1.0)
blend=1.0;
else
if (D <= 0.0)
blend=0.0;
else
{
if ((1.0-S) <= 0.0)
blend=1.0;
else
blend=MagickMin(1.0,D/(1.0-S));
}
pixel=(double) QuantumRange*gamma*(Sa*Da*blend+Sca*(1.0-Da)+Dca*
(1.0-Sa));
break;
}
case ColorizeCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Sc;
break;
}
ConvertRGBToGeneric(colorspace,(double) canvas_pixel.red,
(double) canvas_pixel.green,(double) canvas_pixel.blue,
white_luminance,illuminant,&sans,&sans,&luma);
ConvertRGBToGeneric(colorspace,(double) source_pixel.red,
(double) source_pixel.green,(double) source_pixel.blue,
white_luminance,illuminant,&hue,&chroma,&sans);
ConvertGenericToRGB(colorspace,hue,chroma,luma,
white_luminance,illuminant,&red,&green,&blue);
switch (channel)
{
case RedPixelChannel: pixel=red; break;
case GreenPixelChannel: pixel=green; break;
case BluePixelChannel: pixel=blue; break;
default: pixel=Dc; break;
}
break;
}
case CopyAlphaCompositeOp:
case DstCompositeOp:
{
pixel=Dc;
break;
}
case CopyBlackCompositeOp:
{
if (channel == BlackPixelChannel)
pixel=(MagickRealType) GetPixelBlack(source_image,p);
break;
}
case CopyBlueCompositeOp:
case CopyYellowCompositeOp:
{
if (channel == BluePixelChannel)
pixel=(MagickRealType) GetPixelBlue(source_image,p);
break;
}
case CopyGreenCompositeOp:
case CopyMagentaCompositeOp:
{
if (channel == GreenPixelChannel)
pixel=(MagickRealType) GetPixelGreen(source_image,p);
break;
}
case CopyRedCompositeOp:
case CopyCyanCompositeOp:
{
if (channel == RedPixelChannel)
pixel=(MagickRealType) GetPixelRed(source_image,p);
break;
}
case DarkenCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=RoundToUnity(MagickMin(Sca,Dca)+Sca*(1.0-Da)+Dca*
(1.0-Sa));
break;
}
pixel=(double) QuantumRange*RoundToUnity(MagickMin(Sca,Dca)+Sca*
(1.0-Da)+Dca*(1.0-Sa));
break;
}
case DarkenIntensityCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=RoundToUnity(MagickMin(Sca,Dca)+Sca*(1.0-Di)+Dca*
(1.0-Si));
break;
}
pixel=(double) QuantumRange*RoundToUnity(MagickMin(Sca,Dca)+Sca*
(1.0-Di)+Dca*(1.0-Si));
break;
}
case DifferenceCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(double) QuantumRange*RoundToUnity(fabs((double) Sc-
(double) Dc));
break;
}
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
D=(Da > 0.0) ? (Dca/Da) : 0.0;
pixel=(double) QuantumRange*RoundToUnity(fabs(S-D));
break;
}
case DissolveCompositeOp:
{
pixel=gamma*(source_dissolve*Sa*Sc-source_dissolve*Sa*
canvas_dissolve*Da*Dc+canvas_dissolve*Da*Dc);
break;
}
case DivideDstCompositeOp:
{
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
D=(Da > 0.0) ? (Dca/Da) : 0.0;
if (S <= 0.0)
blend=1.0;
else
blend=MagickMin(1.0,D/S);
pixel=(double) QuantumRange*RoundToUnity(Sca*(1.0-Da)+Dca*(1.0-Sa)+
Sa*Da*blend);
break;
}
case DivideSrcCompositeOp:
{
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
D=(Da > 0.0) ? (Dca/Da) : 0.0;
if (D <= 0.0)
blend=1.0;
else
blend=MagickMin(1.0,S/D);
pixel=(double) QuantumRange*RoundToUnity(Sca*(1.0-Da)+Dca*(1.0-Sa)+
Sa*Da*blend);
break;
}
case DstAtopCompositeOp:
{
pixel=(double) QuantumRange*(Dca*Sa+Sca*(1.0-Da));
break;
}
case DstInCompositeOp:
{
pixel=(double) QuantumRange*gamma*(Dca*Sa);
break;
}
case DstOutCompositeOp:
{
pixel=(double) QuantumRange*gamma*(Dca*(1.0-Sa));
break;
}
case DstOverCompositeOp:
{
pixel=(double) QuantumRange*gamma*(Dca+Sca*(1.0-Da));
break;
}
case ExclusionCompositeOp:
{
S=(Sa > 0.0) ? Sca/Sa : 0.0;
D=(Da > 0.0) ? Dca/Da : 0.0;
blend=RoundToUnity(S+D-2.0*S*D);
pixel=(double) QuantumRange*RoundToUnity((blend*Sa+D*(1.0-Sa))*
(Sa+Da-Sa*Da));
break;
}
case FreezeCompositeOp:
{
if (Dca != 0.0)
blend=1.0-(1.0-Sca)*(1.0-Sca)/Dca;
else
blend=0.0;
pixel=(double) QuantumRange*gamma*RoundToUnity(blend);
break;
}
case HardLightCompositeOp:
{
D=(Da > 0.0) ? (Dca/Da) : 0.0;
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
if (S <= 0.5)
blend=2.0*S*D;
else
blend=1.0-2.0*(1.0-S)*(1.0-D);
pixel=(double) QuantumRange*gamma*RoundToUnity((1.0-Da)*Sca+
(1.0-Sa)*Dca+blend*Sa*Da);
break;
}
case HardMixCompositeOp:
{
if (Sca < 0.5)
{
if ((2.0*Sca) == 0.0)
blend=0.0;
else
blend=1.0-(1.0-Dca)/(2.0*Sca);
}
else
{
if ((1.0-((2.0*Sca)-1.0)) == 0.0)
blend=1.0;
else
blend=Dca/(1.0-(2.0*Sca-1.0));
}
pixel=gamma*((blend < 0.5) ? 0.0 : (double) QuantumRange);
break;
}
case HueCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Sc;
break;
}
ConvertRGBToGeneric(colorspace,(double) canvas_pixel.red,
(double) canvas_pixel.green,(double) canvas_pixel.blue,
white_luminance,illuminant,&hue,&chroma,&luma);
ConvertRGBToGeneric(colorspace,(double) source_pixel.red,
(double) source_pixel.green,(double) source_pixel.blue,
white_luminance,illuminant,&hue,&sans,&sans);
ConvertGenericToRGB(colorspace,hue,chroma,luma,
white_luminance,illuminant,&red,&green,&blue);
switch (channel)
{
case RedPixelChannel: pixel=red; break;
case GreenPixelChannel: pixel=green; break;
case BluePixelChannel: pixel=blue; break;
default: pixel=Dc; break;
}
break;
}
case InCompositeOp:
case SrcInCompositeOp:
{
pixel=(double) QuantumRange*(Sca*Da);
break;
}
case InterpolateCompositeOp:
{
pixel=(double) QuantumRange*(0.5-0.25*cos(MagickPI*Sca)-0.25*
cos(MagickPI*Dca));
break;
}
case LinearBurnCompositeOp:
{
/*
LinearBurn: as defined by Abode Photoshop, according to
http://www.simplefilter.de/en/basics/mixmods.html is:
f(Sc,Dc) = Sc + Dc - 1
*/
pixel=(double) QuantumRange*(Sca+Dca-Sa*Da);
break;
}
case LinearDodgeCompositeOp:
{
pixel=gamma*(Sa*Sc+Da*Dc);
break;
}
case LinearLightCompositeOp:
{
/*
Linear Light (Adobe standard):
f(Sc, Dc) = Dc + 2*Sc - 1
Applied in linear (HDRI) space with clamping.
*/
D=(Da > 0.0) ? Dca/Da : 0.0,
S=(Sa > 0.0) ? Sca/Sa : 0.0;
pixel=(double) QuantumRange*gamma*(RoundToUnity(D+2.0*S-1.0)*Da);
break;
}
case LightenCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=MagickMax(Sc,Dc);
break;
}
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
D=(Da > 0.0) ? (Dca/Da) : 0.0;
pixel=(double) QuantumRange*RoundToUnity(Sca*(1.0-Da)+Dca*(1.0-Sa)+
MagickMax(S,D)*Sa*Da);
break;
}
case LightenIntensityCompositeOp:
{
pixel=Si > Di ? Sc : Dc;
break;
}
case LuminizeCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Sc;
break;
}
ConvertRGBToGeneric(colorspace,(double) canvas_pixel.red,
(double) canvas_pixel.green,(double) canvas_pixel.blue,
white_luminance,illuminant,&hue,&chroma,&luma);
ConvertRGBToGeneric(colorspace,(double) source_pixel.red,
(double) source_pixel.green,(double) source_pixel.blue,
white_luminance,illuminant,&sans,&sans,&luma);
ConvertGenericToRGB(colorspace,hue,chroma,luma,
white_luminance,illuminant,&red,&green,&blue);
switch (channel)
{
case RedPixelChannel: pixel=red; break;
case GreenPixelChannel: pixel=green; break;
case BluePixelChannel: pixel=blue; break;
default: pixel=Dc; break;
}
break;
}
case MathematicsCompositeOp:
{
/*
'Mathematics' a free form user control mathematical composition
is defined as...
f(Sc,Dc) = A*Sc*Dc + B*Sc + C*Dc + D
Where the arguments A,B,C,D are (currently) passed to composite
as a command separated 'geometry' string in "compose:args" image
artifact.
A = a->rho, B = a->sigma, C = a->xi, D = a->psi
Applying the SVG transparency formula (see above), we get...
Dca' = Sa*Da*f(Sc,Dc) + Sca*(1.0-Da) + Dca*(1.0-Sa)
Dca' = A*Sca*Dca + B*Sca*Da + C*Dca*Sa + D*Sa*Da + Sca*(1.0-Da) +
Dca*(1.0-Sa)
*/
if (compose_sync == MagickFalse)
{
pixel=geometry_info.rho*Sc*Dc+geometry_info.sigma*Sc+
geometry_info.xi*Dc+geometry_info.psi;
break;
}
pixel=(double) QuantumRange*gamma*(geometry_info.rho*Sca*Dca+
geometry_info.sigma*Sca*Da+geometry_info.xi*Dca*Sa+
geometry_info.psi*Sa*Da+Sca*(1.0-Da)+Dca*(1.0-Sa));
break;
}
case MinusDstCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=Dc-Sc;
break;
}
pixel=gamma*(Sa*Sc+Da*Dc-2.0*Da*Dc*Sa);
break;
}
case MinusSrcCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=Sc-Dc;
break;
}
pixel=gamma*(Da*Dc+Sa*Sc-2.0*Sa*Sc*Da);
break;
}
case ModulateCompositeOp:
{
ssize_t
offset;
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
offset=(ssize_t) (Si-midpoint);
if (offset == 0)
{
pixel=Dc;
break;
}
ConvertRGBToGeneric(colorspace,(double) canvas_pixel.red,
(double) canvas_pixel.green,(double) canvas_pixel.blue,
white_luminance,illuminant,&hue,&chroma,&luma);
luma+=(0.01*percent_luma*offset)/midpoint;
chroma*=0.01*percent_chroma;
ConvertGenericToRGB(colorspace,hue,chroma,luma,
white_luminance,illuminant,&red,&green,&blue);
switch (channel)
{
case RedPixelChannel: pixel=red; break;
case GreenPixelChannel: pixel=green; break;
case BluePixelChannel: pixel=blue; break;
default: pixel=Dc; break;
}
break;
}
case ModulusAddCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(Quantum) QuantumRange*((Sc+Dc)-floor(Sc+Dc));
break;
}
pixel=(Quantum) QuantumRange*((Sca+Dca)-floor(Sca+Dca));
break;
}
case ModulusSubtractCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(Quantum) QuantumRange*((Sc-Dc)-floor(Sc-Dc));
break;
}
pixel=(Quantum) QuantumRange*((Sca-Dca)-floor(Sca-Dca));
break;
}
case MultiplyCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(double) QuantumRange*Sc*Dc;
break;
}
pixel=(double) QuantumRange*(Sca*Dca+Sca*(1.0-Da)+Dca*(1.0-Sa));
break;
}
case NegateCompositeOp:
{
D=(Da > 0.0) ? Dca/Da : 0.0;
S=(Sa > 0.0) ? Sca/Sa : 0.0;
pixel=(double) QuantumRange*((1.0-fabs(1.0-S-D))*Da);
break;
}
case NoCompositeOp:
{
pixel=(double) QuantumRange*Dca;
break;
}
case OutCompositeOp:
case SrcOutCompositeOp:
{
pixel=(double) QuantumRange*(Sca*(1.0-Da));
break;
}
case OverCompositeOp:
case SrcOverCompositeOp:
{
if ((Sa+Da*(1.0-Sa)) <= MagickEpsilon)
pixel=0.0;
else
pixel=(double) QuantumRange*gamma*((Sca+Dca*(1.0-Sa))/
(Sa+Da*(1.0-Sa)));
break;
}
case OverlayCompositeOp:
{
if ((2.0*Dca) < Da)
{
pixel=(double) QuantumRange*gamma*(2.0*Dca*Sca+Dca*(1.0-Sa)+
Sca*(1.0-Da));
break;
}
pixel=(double) QuantumRange*gamma*(Da*Sa-2.0*(Sa-Sca)*(Da-Dca)+Dca*
(1.0-Sa)+Sca*(1.0-Da));
break;
}
case PegtopLightCompositeOp:
{
if (fabs((double) Da) < MagickEpsilon)
{
pixel=(double) QuantumRange*gamma*Sca;
break;
}
if (RoundToUnity(Sca) <= 0.5)
blend=RoundToUnity(Dca/Da)-(1.0-2.0*RoundToUnity(Sca))*
RoundToUnity(Dca/Da)*(1.0-RoundToUnity(Dca/Da));
else
{
if (RoundToUnity(Dca/Da) <= 0.25)
blend=((16.0*RoundToUnity(Dca/Da)-12.0)*RoundToUnity(Dca/Da)+
4.0)*RoundToUnity(Dca/Da);
else
blend=sqrt(RoundToUnity(Dca/Da));
blend=RoundToUnity(Dca/Da)+(2.0*RoundToUnity(Sca)-1.0)*
(blend-RoundToUnity(Dca/Da));
}
pixel=(double) QuantumRange*gamma*(RoundToUnity(blend)*Da*Sa+Dca*
(1.0-Sa));
break;
}
case PinLightCompositeOp:
{
/*
Adobe Pin Light (colors in [0,1]):
if (Cs <= 0.5)
f = min(Cd, 2*Cs);
else
f = max(Cd, 2*Cs - 1);
*/
D=(Da > 0.0) ? RoundToUnity(Dca/Da) : 0.0;
S=(Sa > 0.0) ? RoundToUnity(Sca/Sa) : 0.0;
if (S <= 0.5)
blend=MagickMin(D,2.0*S);
else
blend=MagickMax(D,2.0*S-1.0);
pixel=(double) QuantumRange*gamma*(blend*RoundToUnity(Sa+Da-Sa*Da));
break;
}
case PlusCompositeOp:
{
D=(Da > 0.0) ? Dca/Da : 0.0;
S=(Sa > 0.0) ? Sca/Sa : 0.0;
pixel=(double) QuantumRange*(RoundToUnity(Sa+Da-Sa*Da)*
RoundToUnity(S+D));
break;
}
case ReflectCompositeOp:
{
if (compose_sync == MagickFalse)
{
if (Dc < 1.0)
blend=(Sc*Sc)/(1.0-Dc);
else
blend=1.0;
pixel=(double) QuantumRange*RoundToUnity(blend);
break;
}
if (Sa > 0.0)
S=Sca/Sa;
else
S=0.0;
if (Da > 0.0)
D=Dca/Da;
else
D=0.0;
if (D < 1.0)
blend=(S*S)/(1.0-D);
else
blend=1.0;
pixel=(double) QuantumRange*RoundToUnity((Sa+Da-Sa*Da)*blend);
break;
}
case RMSECompositeOp:
{
double
gray;
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Sc;
break;
}
gray=sqrt(
(canvas_pixel.red-source_pixel.red)*
(canvas_pixel.red-source_pixel.red)+
(canvas_pixel.green-source_pixel.green)*
(canvas_pixel.green-source_pixel.green)+
(canvas_pixel.blue-source_pixel.blue)*
(canvas_pixel.blue-source_pixel.blue)/3.0);
switch (channel)
{
case RedPixelChannel: pixel=gray; break;
case GreenPixelChannel: pixel=gray; break;
case BluePixelChannel: pixel=gray; break;
default: pixel=Dc; break;
}
break;
}
case SaturateCompositeOp:
{
if (fabs((double) QuantumRange*Sa-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Dc;
break;
}
if (fabs((double) QuantumRange*Da-(double) TransparentAlpha) < MagickEpsilon)
{
pixel=Sc;
break;
}
ConvertRGBToGeneric(colorspace,(double) canvas_pixel.red,
(double) canvas_pixel.green,(double) canvas_pixel.blue,
white_luminance,illuminant,&hue,&chroma,&luma);
ConvertRGBToGeneric(colorspace,(double) source_pixel.red,
(double) source_pixel.green,(double) source_pixel.blue,
white_luminance,illuminant,&sans,&chroma,&sans);
ConvertGenericToRGB(colorspace,hue,chroma,luma,
white_luminance,illuminant,&red,&green,&blue);
switch (channel)
{
case RedPixelChannel: pixel=red; break;
case GreenPixelChannel: pixel=green; break;
case BluePixelChannel: pixel=blue; break;
default: pixel=Dc; break;
}
break;
}
case ScreenCompositeOp:
{
if (compose_sync == MagickFalse)
{
pixel=(double) QuantumRange*RoundToUnity(Sc+Dc-Sc*Dc);
break;
}
if (Sa > 0.0)
S=Sca/Sa;
else
S=0.0;
if (Da > 0.0)
D=Dca/Da;
else
D=0.0;
if ((Sa+Da-Sa*Da) > 0.0)
pixel=(double) QuantumRange*RoundToUnity((Sa+Da-Sa*Da)*(S+D-S*D));
else
pixel=0.0;
break;
}
case SoftBurnCompositeOp:
{
if (RoundToUnity(Dca) <= 0.0)
blend = 0.0;
else
if (RoundToUnity(Sca) >= 1.0)
blend = 1.0;
else
blend=1.0-MagickMin(1.0,(1.0-RoundToUnity(Dca))/
RoundToUnity(Sca));
pixel=(double) QuantumRange*gamma*RoundToUnity(blend);
break;
}
case SoftDodgeCompositeOp:
{
if (RoundToUnity(Sca) <= 0.0)
blend=RoundToUnity(Dca);
else
if (RoundToUnity(Dca) >= 1.0)
blend=1.0;
else
blend=MagickMin(1.0,RoundToUnity(Dca)/(1.0-RoundToUnity(Sca)));
pixel=(double) QuantumRange*gamma*RoundToUnity(blend);
break;
}
case SoftLightCompositeOp:
{
if (RoundToUnity(Sca) <= 0.5)
{
pixel=(double) QuantumRange*gamma*(RoundToUnity(Dca)*Sa+Da*
(RoundToUnity(Dca)-(1.0-2.0*RoundToUnity(Sca))*
RoundToUnity(Dca)*(1.0-RoundToUnity(Dca)))+RoundToUnity(Sca)*
(1.0-Da)+RoundToUnity(Dca)*(1.0-Sa));
break;
}
if (RoundToUnity(Dca) > 0.25)
blend=sqrt(RoundToUnity(Dca));
else
blend=((16.0*RoundToUnity(Dca)-12.0)*RoundToUnity(Dca)+4.0)*
RoundToUnity(Dca);
pixel=(double) QuantumRange*gamma*(RoundToUnity(Dca)*Sa+Da*
(RoundToUnity(Dca)+(2.0*RoundToUnity(Sca)-1.0)*
(RoundToUnity(blend)-RoundToUnity(Dca)))+RoundToUnity(Sca)*
(1.0-Da)+RoundToUnity(Dca)*(1.0-Sa));
break;
}
case StampCompositeOp:
{
pixel=(double) QuantumRange*RoundToUnity(Sca+Dca-1.0);
break;
}
case StereoCompositeOp:
{
if (channel == RedPixelChannel)
pixel=(MagickRealType) GetPixelRed(source_image,p);
break;
}
case ThresholdCompositeOp:
{
S=(Sa > 0.0) ? (Sca/Sa) : 0.0;
D=(Da > 0.0) ? (Dca/Da) : 0.0;
if (fabs(2.0*(S-D)) < threshold)
blend=D;
else
blend=D+(S-D)*amount;
pixel=(double) QuantumRange*(Sa*Da*RoundToUnity(blend)+Sca*
(1.0-Da)+Dca*(1.0-Sa));
break;
}
case VividLightCompositeOp:
{
if ((fabs((double) Sa) < MagickEpsilon) ||
(fabs((double) Da) < MagickEpsilon))
{
pixel=(double) QuantumRange*gamma*(Sa*Da+Sca*(1.0-Da)+Dca*
(1.0-Sa));
break;
}
if (RoundToUnity(Sca/Sa) <= 0.0)
blend=0.0;
else
if (RoundToUnity(Sca/Sa) < 0.5)
blend=1.0-(1.0-RoundToUnity(Dca/Da))/(2.0*RoundToUnity(Sca/Sa));
else
if (RoundToUnity(Sca/Sa) < 1.0)
blend=RoundToUnity(Dca/Da)/(2.0*(1.0-RoundToUnity(Sca/Sa)));
else
blend=1.0;
pixel=(double) QuantumRange*gamma*(Sa*Da*RoundToUnity(blend)+Sca*
(1.0-Da)+Dca*(1.0-Sa));
break;
}
case XorCompositeOp:
{
pixel=(double) QuantumRange*(Sca*(1.0-Da)+Dca*(1.0-Sa));
break;
}
default:
{
pixel=Sc;
break;
}
}
q[i]=clamp != MagickFalse ? ClampPixel(pixel) : ClampToQuantum(pixel);
}
p+=(ptrdiff_t) GetPixelChannels(source_image);
channels=GetPixelChannels(source_image);
if (p >= (pixels+channels*source_image->columns))
p=pixels;
q+=(ptrdiff_t) GetPixelChannels(image);
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp atomic
#endif
progress++;
proceed=SetImageProgress(image,CompositeImageTag,progress,image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
source_view=DestroyCacheView(source_view);
image_view=DestroyCacheView(image_view);
if (canvas_image != (Image * ) NULL)
canvas_image=DestroyImage(canvas_image);
else
source_image=DestroyImage(source_image);
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% T e x t u r e I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% TextureImage() repeatedly tiles the texture image across and down the image
% canvas.
%
% The format of the TextureImage method is:
%
% MagickBooleanType TextureImage(Image *image,const Image *texture,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: the image.
%
% o texture_image: This image is the texture to layer on the background.
%
*/
MagickExport MagickBooleanType TextureImage(Image *image,const Image *texture,
ExceptionInfo *exception)
{
#define TextureImageTag "Texture/Image"
CacheView
*image_view,
*texture_view;
Image
*texture_image;
MagickBooleanType
status;
ssize_t
y;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
if (texture == (const Image *) NULL)
return(MagickFalse);
if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse)
return(MagickFalse);
texture_image=CloneImage(texture,0,0,MagickTrue,exception);
if (texture_image == (const Image *) NULL)
return(MagickFalse);
(void) TransformImageColorspace(texture_image,image->colorspace,exception);
(void) SetImageVirtualPixelMethod(texture_image,TileVirtualPixelMethod,
exception);
status=MagickTrue;
if ((image->compose != CopyCompositeOp) &&
((image->compose != OverCompositeOp) ||
(image->alpha_trait != UndefinedPixelTrait) ||
(texture_image->alpha_trait != UndefinedPixelTrait)))
{
/*
Tile texture onto the image background.
*/
for (y=0; y < (ssize_t) image->rows; y+=(ssize_t) texture_image->rows)
{
ssize_t
x;
if (status == MagickFalse)
continue;
for (x=0; x < (ssize_t) image->columns; x+=(ssize_t) texture_image->columns)
{
MagickBooleanType
thread_status;
thread_status=CompositeImage(image,texture_image,image->compose,
MagickTrue,x+texture_image->tile_offset.x,y+
texture_image->tile_offset.y,exception);
if (thread_status == MagickFalse)
{
status=thread_status;
break;
}
}
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
proceed=SetImageProgress(image,TextureImageTag,(MagickOffsetType) y,
image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
(void) SetImageProgress(image,TextureImageTag,(MagickOffsetType)
image->rows,image->rows);
texture_image=DestroyImage(texture_image);
return(status);
}
/*
Tile texture onto the image background (optimized).
*/
status=MagickTrue;
texture_view=AcquireVirtualCacheView(texture_image,exception);
image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(texture_image,image,image->rows,2)
#endif
for (y=0; y < (ssize_t) image->rows; y++)
{
MagickBooleanType
sync;
const Quantum
*p,
*pixels;
ssize_t
x;
Quantum
*q;
size_t
width;
if (status == MagickFalse)
continue;
pixels=GetCacheViewVirtualPixels(texture_view,texture_image->tile_offset.x,
(y+texture_image->tile_offset.y) % (ssize_t) texture_image->rows,
texture_image->columns,1,exception);
q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if ((pixels == (const Quantum *) NULL) || (q == (Quantum *) NULL))
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) image->columns; x+=(ssize_t) texture_image->columns)
{
ssize_t
j;
p=pixels;
width=texture_image->columns;
if ((x+(ssize_t) width) > (ssize_t) image->columns)
width=image->columns-(size_t) x;
for (j=0; j < (ssize_t) width; j++)
{
ssize_t
i;
for (i=0; i < (ssize_t) GetPixelChannels(texture_image); i++)
{
PixelChannel channel = GetPixelChannelChannel(texture_image,i);
PixelTrait traits = GetPixelChannelTraits(image,channel);
PixelTrait texture_traits=GetPixelChannelTraits(texture_image,
channel);
if ((traits == UndefinedPixelTrait) ||
(texture_traits == UndefinedPixelTrait))
continue;
SetPixelChannel(image,channel,p[i],q);
}
p+=(ptrdiff_t) GetPixelChannels(texture_image);
q+=(ptrdiff_t) GetPixelChannels(image);
}
}
sync=SyncCacheViewAuthenticPixels(image_view,exception);
if (sync == MagickFalse)
status=MagickFalse;
if (image->progress_monitor != (MagickProgressMonitor) NULL)
{
MagickBooleanType
proceed;
proceed=SetImageProgress(image,TextureImageTag,(MagickOffsetType) y,
image->rows);
if (proceed == MagickFalse)
status=MagickFalse;
}
}
texture_view=DestroyCacheView(texture_view);
image_view=DestroyCacheView(image_view);
texture_image=DestroyImage(texture_image);
return(status);
}
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