| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % TTTTT H H RRRR EEEEE SSSSS H H OOO L DDDD % |
| % T H H R R E SS H H O O L D D % |
| % T HHHHH RRRR EEE SSS HHHHH O O L D D % |
| % T H H R R E SS H H O O L D D % |
| % T H H R R EEEEE SSSSS H H OOO LLLLL DDDD % |
| % % |
| % % |
| % MagickCore Image Threshold Methods % |
| % % |
| % Software Design % |
| % John Cristy % |
| % October 1996 % |
| % % |
| % % |
| % Copyright 1999-2010 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 % |
| % % |
| % http://www.imagemagick.org/script/license.php % |
| % % |
| % 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 "magick/studio.h" |
| #include "magick/property.h" |
| #include "magick/blob.h" |
| #include "magick/cache-view.h" |
| #include "magick/color.h" |
| #include "magick/color-private.h" |
| #include "magick/colormap.h" |
| #include "magick/colorspace.h" |
| #include "magick/configure.h" |
| #include "magick/constitute.h" |
| #include "magick/decorate.h" |
| #include "magick/draw.h" |
| #include "magick/enhance.h" |
| #include "magick/exception.h" |
| #include "magick/exception-private.h" |
| #include "magick/effect.h" |
| #include "magick/fx.h" |
| #include "magick/gem.h" |
| #include "magick/geometry.h" |
| #include "magick/image-private.h" |
| #include "magick/list.h" |
| #include "magick/log.h" |
| #include "magick/memory_.h" |
| #include "magick/monitor.h" |
| #include "magick/monitor-private.h" |
| #include "magick/montage.h" |
| #include "magick/option.h" |
| #include "magick/pixel-private.h" |
| #include "magick/quantize.h" |
| #include "magick/quantum.h" |
| #include "magick/random_.h" |
| #include "magick/random-private.h" |
| #include "magick/resize.h" |
| #include "magick/resource_.h" |
| #include "magick/segment.h" |
| #include "magick/shear.h" |
| #include "magick/signature-private.h" |
| #include "magick/string_.h" |
| #include "magick/string-private.h" |
| #include "magick/transform.h" |
| #include "magick/threshold.h" |
| #include "magick/xml-tree.h" |
| |
| /* |
| Define declarations. |
| */ |
| #define ThresholdsFilename "thresholds.xml" |
| |
| /* |
| Typedef declarations. |
| */ |
| struct _ThresholdMap |
| { |
| char |
| *map_id, |
| *description; |
| |
| size_t |
| width, |
| height; |
| |
| ssize_t |
| divisor, |
| *levels; |
| }; |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % A d a p t i v e T h r e s h o l d I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % AdaptiveThresholdImage() selects an individual threshold for each pixel |
| % based on the range of intensity values in its local neighborhood. This |
| % allows for thresholding of an image whose global intensity histogram |
| % doesn't contain distinctive peaks. |
| % |
| % The format of the AdaptiveThresholdImage method is: |
| % |
| % Image *AdaptiveThresholdImage(const Image *image, |
| % const size_t width,const size_t height, |
| % const ssize_t offset,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o width: the width of the local neighborhood. |
| % |
| % o height: the height of the local neighborhood. |
| % |
| % o offset: the mean offset. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport Image *AdaptiveThresholdImage(const Image *image, |
| const size_t width,const size_t height,const ssize_t offset, |
| ExceptionInfo *exception) |
| { |
| #define ThresholdImageTag "Threshold/Image" |
| |
| CacheView |
| *image_view, |
| *threshold_view; |
| |
| Image |
| *threshold_image; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| MagickPixelPacket |
| zero; |
| |
| MagickRealType |
| number_pixels; |
| |
| ssize_t |
| y; |
| |
| assert(image != (const Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| assert(exception != (ExceptionInfo *) NULL); |
| assert(exception->signature == MagickSignature); |
| if ((image->columns < width) || (image->rows < height)) |
| ThrowImageException(OptionError,"ImageSmallerThanRadius"); |
| threshold_image=CloneImage(image,0,0,MagickTrue,exception); |
| if (threshold_image == (Image *) NULL) |
| return((Image *) NULL); |
| if (SetImageStorageClass(threshold_image,DirectClass) == MagickFalse) |
| { |
| InheritException(exception,&threshold_image->exception); |
| threshold_image=DestroyImage(threshold_image); |
| return((Image *) NULL); |
| } |
| /* |
| Local adaptive threshold. |
| */ |
| status=MagickTrue; |
| progress=0; |
| GetMagickPixelPacket(image,&zero); |
| number_pixels=(MagickRealType) width*height; |
| image_view=AcquireCacheView(image); |
| threshold_view=AcquireCacheView(threshold_image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| MagickBooleanType |
| sync; |
| |
| register const IndexPacket |
| *restrict indexes; |
| |
| register const PixelPacket |
| *restrict p; |
| |
| register IndexPacket |
| *restrict threshold_indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewVirtualPixels(image_view,-((ssize_t) width/2L),y-(ssize_t) |
| height/2L,image->columns+width,height,exception); |
| q=GetCacheViewAuthenticPixels(threshold_view,0,y,threshold_image->columns,1, |
| exception); |
| if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL)) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewVirtualIndexQueue(image_view); |
| threshold_indexes=GetCacheViewAuthenticIndexQueue(threshold_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| ssize_t |
| v; |
| |
| MagickPixelPacket |
| mean, |
| pixel; |
| |
| register const PixelPacket |
| *r; |
| |
| register ssize_t |
| u; |
| |
| pixel=zero; |
| mean=zero; |
| r=p; |
| for (v=0; v < (ssize_t) height; v++) |
| { |
| for (u=0; u < (ssize_t) width; u++) |
| { |
| pixel.red+=r[u].red; |
| pixel.green+=r[u].green; |
| pixel.blue+=r[u].blue; |
| pixel.opacity+=r[u].opacity; |
| if (image->colorspace == CMYKColorspace) |
| pixel.index=(MagickRealType) indexes[x+(r-p)+u]; |
| } |
| r+=image->columns+width; |
| } |
| mean.red=(MagickRealType) (pixel.red/number_pixels+offset); |
| mean.green=(MagickRealType) (pixel.green/number_pixels+offset); |
| mean.blue=(MagickRealType) (pixel.blue/number_pixels+offset); |
| mean.opacity=(MagickRealType) (pixel.opacity/number_pixels+offset); |
| if (image->colorspace == CMYKColorspace) |
| mean.index=(MagickRealType) (pixel.index/number_pixels+offset); |
| q->red=(Quantum) (((MagickRealType) q->red <= mean.red) ? |
| 0 : QuantumRange); |
| q->green=(Quantum) (((MagickRealType) q->green <= mean.green) ? |
| 0 : QuantumRange); |
| q->blue=(Quantum) (((MagickRealType) q->blue <= mean.blue) ? |
| 0 : QuantumRange); |
| q->opacity=(Quantum) (((MagickRealType) q->opacity <= mean.opacity) ? |
| 0 : QuantumRange); |
| if (image->colorspace == CMYKColorspace) |
| threshold_indexes[x]=(IndexPacket) (((MagickRealType) |
| threshold_indexes[x] <= mean.index) ? 0 : QuantumRange); |
| p++; |
| q++; |
| } |
| sync=SyncCacheViewAuthenticPixels(threshold_view,exception); |
| if (sync == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_AdaptiveThresholdImage) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| threshold_view=DestroyCacheView(threshold_view); |
| image_view=DestroyCacheView(image_view); |
| if (status == MagickFalse) |
| threshold_image=DestroyImage(threshold_image); |
| return(threshold_image); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % B i l e v e l I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % BilevelImage() changes the value of individual pixels based on the |
| % intensity of each pixel channel. The result is a high-contrast image. |
| % |
| % More precisely each channel value of the image is 'thresholded' so that if |
| % it is equal to or less than the given value it is set to zero, while any |
| % value greater than that give is set to it maximum or QuantumRange. |
| % |
| % This function is what is used to implement the "-threshold" operator for |
| % the command line API. |
| % |
| % If the default channel setting is given the image is thresholded using just |
| % the gray 'intensity' of the image, rather than the individual channels. |
| % |
| % The format of the BilevelImageChannel method is: |
| % |
| % MagickBooleanType BilevelImage(Image *image,const double threshold) |
| % MagickBooleanType BilevelImageChannel(Image *image, |
| % const ChannelType channel,const double threshold) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel type. |
| % |
| % o threshold: define the threshold values. |
| % |
| % Aside: You can get the same results as operator using LevelImageChannels() |
| % with the 'threshold' value for both the black_point and the white_point. |
| % |
| */ |
| |
| MagickExport MagickBooleanType BilevelImage(Image *image,const double threshold) |
| { |
| MagickBooleanType |
| status; |
| |
| status=BilevelImageChannel(image,DefaultChannels,threshold); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType BilevelImageChannel(Image *image, |
| const ChannelType channel,const double threshold) |
| { |
| #define ThresholdImageTag "Threshold/Image" |
| |
| CacheView |
| *image_view; |
| |
| ExceptionInfo |
| *exception; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| ssize_t |
| y; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| if (SetImageStorageClass(image,DirectClass) == MagickFalse) |
| return(MagickFalse); |
| /* |
| Bilevel threshold image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| exception=(&image->exception); |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| if (channel == DefaultChannels) |
| { |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| q->red=(Quantum) ((MagickRealType) PixelIntensityToQuantum(q) <= |
| threshold ? 0 : QuantumRange); |
| q->green=q->red; |
| q->blue=q->red; |
| q++; |
| } |
| } |
| else |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if ((channel & RedChannel) != 0) |
| q->red=(Quantum) ((MagickRealType) q->red <= threshold ? 0 : |
| QuantumRange); |
| if ((channel & GreenChannel) != 0) |
| q->green=(Quantum) ((MagickRealType) q->green <= threshold ? 0 : |
| QuantumRange); |
| if ((channel & BlueChannel) != 0) |
| q->blue=(Quantum) ((MagickRealType) q->blue <= threshold ? 0 : |
| QuantumRange); |
| if ((channel & OpacityChannel) != 0) |
| { |
| if (image->matte == MagickFalse) |
| q->opacity=(Quantum) ((MagickRealType) q->opacity <= threshold ? |
| 0 : QuantumRange); |
| else |
| q->opacity=(Quantum) ((MagickRealType) q->opacity <= threshold ? |
| OpaqueOpacity : TransparentOpacity); |
| } |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace)) |
| indexes[x]=(IndexPacket) ((MagickRealType) indexes[x] <= threshold ? |
| 0 : QuantumRange); |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_BilevelImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % B l a c k T h r e s h o l d I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % BlackThresholdImage() is like ThresholdImage() but forces all pixels below |
| % the threshold into black while leaving all pixels at or above the threshold |
| % unchanged. |
| % |
| % The format of the BlackThresholdImage method is: |
| % |
| % MagickBooleanType BlackThresholdImage(Image *image,const char *threshold) |
| % MagickBooleanType BlackThresholdImageChannel(Image *image, |
| % const ChannelType channel,const char *threshold, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel or channels to be thresholded. |
| % |
| % o threshold: Define the threshold value. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport MagickBooleanType BlackThresholdImage(Image *image, |
| const char *threshold) |
| { |
| MagickBooleanType |
| status; |
| |
| status=BlackThresholdImageChannel(image,DefaultChannels,threshold, |
| &image->exception); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType BlackThresholdImageChannel(Image *image, |
| const ChannelType channel,const char *thresholds,ExceptionInfo *exception) |
| { |
| #define ThresholdImageTag "Threshold/Image" |
| |
| CacheView |
| *image_view; |
| |
| GeometryInfo |
| geometry_info; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| MagickPixelPacket |
| threshold; |
| |
| MagickStatusType |
| flags; |
| |
| ssize_t |
| y; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| if (thresholds == (const char *) NULL) |
| return(MagickTrue); |
| if (SetImageStorageClass(image,DirectClass) == MagickFalse) |
| return(MagickFalse); |
| GetMagickPixelPacket(image,&threshold); |
| flags=ParseGeometry(thresholds,&geometry_info); |
| threshold.red=geometry_info.rho; |
| threshold.green=geometry_info.sigma; |
| if ((flags & SigmaValue) == 0) |
| threshold.green=threshold.red; |
| threshold.blue=geometry_info.xi; |
| if ((flags & XiValue) == 0) |
| threshold.blue=threshold.red; |
| threshold.opacity=geometry_info.psi; |
| if ((flags & PsiValue) == 0) |
| threshold.opacity=threshold.red; |
| threshold.index=geometry_info.chi; |
| if ((flags & ChiValue) == 0) |
| threshold.index=threshold.red; |
| if ((flags & PercentValue) != 0) |
| { |
| threshold.red*=(QuantumRange/100.0); |
| threshold.green*=(QuantumRange/100.0); |
| threshold.blue*=(QuantumRange/100.0); |
| threshold.opacity*=(QuantumRange/100.0); |
| threshold.index*=(QuantumRange/100.0); |
| } |
| /* |
| Black threshold image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if (channel != DefaultChannels) |
| { |
| if (PixelIntensity(q) < MagickPixelIntensity(&threshold)) |
| { |
| q->red=(Quantum) 0; |
| q->green=(Quantum) 0; |
| q->blue=(Quantum) 0; |
| if (image->colorspace == CMYKColorspace) |
| indexes[x]=(Quantum) 0; |
| } |
| } |
| else |
| { |
| if (((channel & RedChannel) != 0) && |
| ((MagickRealType) q->red < threshold.red)) |
| q->red=(Quantum) 0; |
| if (((channel & GreenChannel) != 0) && |
| ((MagickRealType) q->green < threshold.green)) |
| q->green=(Quantum) 0; |
| if (((channel & BlueChannel) != 0) && |
| ((MagickRealType) q->blue < threshold.blue)) |
| q->blue=(Quantum) 0; |
| if (((channel & OpacityChannel) != 0) && |
| ((MagickRealType) q->opacity < threshold.opacity)) |
| q->opacity=(Quantum) 0; |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace) && |
| ((MagickRealType) indexes[x] < threshold.index)) |
| indexes[x]=(Quantum) 0; |
| } |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_BlackThresholdImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % C l a m p I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ClampImage() restricts the color range from 0 to the quantum depth. |
| % |
| % The format of the ClampImageChannel method is: |
| % |
| % MagickBooleanType ClampImage(Image *image) |
| % MagickBooleanType ClampImageChannel(Image *image, |
| % const ChannelType channel) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel type. |
| % |
| */ |
| |
| static inline Quantum ClampToUnsignedQuantum(const Quantum quantum) |
| { |
| #if defined(MAGICKCORE_HDRI_SUPPORT) |
| if (quantum <= 0) |
| return(0); |
| if (quantum >= QuantumRange) |
| return(QuantumRange); |
| return(quantum); |
| #else |
| return(quantum); |
| #endif |
| } |
| |
| MagickExport MagickBooleanType ClampImage(Image *image) |
| { |
| MagickBooleanType |
| status; |
| |
| status=ClampImageChannel(image,DefaultChannels); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType ClampImageChannel(Image *image, |
| const ChannelType channel) |
| { |
| #define ClampImageTag "Clamp/Image" |
| |
| CacheView |
| *image_view; |
| |
| ExceptionInfo |
| *exception; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| ssize_t |
| y; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| if (image->storage_class == PseudoClass) |
| { |
| register ssize_t |
| i; |
| |
| register PixelPacket |
| *restrict q; |
| |
| q=image->colormap; |
| for (i=0; i < (ssize_t) image->colors; i++) |
| { |
| q->red=ClampToUnsignedQuantum(q->red); |
| q->green=ClampToUnsignedQuantum(q->green); |
| q->blue=ClampToUnsignedQuantum(q->blue); |
| q->opacity=ClampToUnsignedQuantum(q->opacity); |
| q++; |
| } |
| return(SyncImage(image)); |
| } |
| /* |
| Clamp image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| exception=(&image->exception); |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if ((channel & RedChannel) != 0) |
| q->red=ClampToUnsignedQuantum(q->red); |
| if ((channel & GreenChannel) != 0) |
| q->green=ClampToUnsignedQuantum(q->green); |
| if ((channel & BlueChannel) != 0) |
| q->blue=ClampToUnsignedQuantum(q->blue); |
| if ((channel & OpacityChannel) != 0) |
| q->opacity=ClampToUnsignedQuantum(q->opacity); |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace)) |
| indexes[x]=(IndexPacket) ClampToUnsignedQuantum(indexes[x]); |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_ClampImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ClampImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % D e s t r o y T h r e s h o l d M a p % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % DestroyThresholdMap() de-allocate the given ThresholdMap |
| % |
| % The format of the ListThresholdMaps method is: |
| % |
| % ThresholdMap *DestroyThresholdMap(Threshold *map) |
| % |
| % A description of each parameter follows. |
| % |
| % o map: Pointer to the Threshold map to destroy |
| % |
| */ |
| MagickExport ThresholdMap *DestroyThresholdMap(ThresholdMap *map) |
| { |
| assert(map != (ThresholdMap *) NULL); |
| if (map->map_id != (char *) NULL) |
| map->map_id=DestroyString(map->map_id); |
| if (map->description != (char *) NULL) |
| map->description=DestroyString(map->description); |
| if (map->levels != (ssize_t *) NULL) |
| map->levels=(ssize_t *) RelinquishMagickMemory(map->levels); |
| map=(ThresholdMap *) RelinquishMagickMemory(map); |
| return(map); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| + G e t T h r e s h o l d M a p F i l e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % GetThresholdMapFile() look for a given threshold map name or alias in the |
| % given XML file data, and return the allocated the map when found. |
| % |
| % The format of the ListThresholdMaps method is: |
| % |
| % ThresholdMap *GetThresholdMap(const char *xml,const char *filename, |
| % const char *map_id,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o xml: The threshold map list in XML format. |
| % |
| % o filename: The threshold map XML filename. |
| % |
| % o map_id: ID of the map to look for in XML list. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport ThresholdMap *GetThresholdMapFile(const char *xml, |
| const char *filename,const char *map_id,ExceptionInfo *exception) |
| { |
| const char |
| *attr, |
| *content; |
| |
| double |
| value; |
| |
| ThresholdMap |
| *map; |
| |
| XMLTreeInfo |
| *description, |
| *levels, |
| *threshold, |
| *thresholds; |
| |
| map = (ThresholdMap *)NULL; |
| (void) LogMagickEvent(ConfigureEvent,GetMagickModule(), |
| "Loading threshold map file \"%s\" ...",filename); |
| thresholds=NewXMLTree(xml,exception); |
| if ( thresholds == (XMLTreeInfo *)NULL ) |
| return(map); |
| |
| for( threshold = GetXMLTreeChild(thresholds,"threshold"); |
| threshold != (XMLTreeInfo *)NULL; |
| threshold = GetNextXMLTreeTag(threshold) ) { |
| attr = GetXMLTreeAttribute(threshold, "map"); |
| if ( (attr != (char *)NULL) && (LocaleCompare(map_id,attr) == 0) ) |
| break; |
| attr = GetXMLTreeAttribute(threshold, "alias"); |
| if ( (attr != (char *)NULL) && (LocaleCompare(map_id,attr) == 0) ) |
| break; |
| } |
| if ( threshold == (XMLTreeInfo *)NULL ) { |
| return(map); |
| } |
| description = GetXMLTreeChild(threshold,"description"); |
| if ( description == (XMLTreeInfo *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingElement", "<description>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| return(map); |
| } |
| levels = GetXMLTreeChild(threshold,"levels"); |
| if ( levels == (XMLTreeInfo *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingElement", "<levels>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| return(map); |
| } |
| |
| /* The map has been found -- Allocate a Threshold Map to return */ |
| map = (ThresholdMap *)AcquireMagickMemory(sizeof(ThresholdMap)); |
| if ( map == (ThresholdMap *)NULL ) |
| ThrowFatalException(ResourceLimitFatalError,"UnableToAcquireThresholdMap"); |
| map->map_id = (char *)NULL; |
| map->description = (char *)NULL; |
| map->levels = (ssize_t *) NULL; |
| |
| /* Assign Basic Attributes */ |
| attr = GetXMLTreeAttribute(threshold, "map"); |
| if ( attr != (char *)NULL ) |
| map->map_id = ConstantString(attr); |
| |
| content = GetXMLTreeContent(description); |
| if ( content != (char *)NULL ) |
| map->description = ConstantString(content); |
| |
| attr = GetXMLTreeAttribute(levels, "width"); |
| if ( attr == (char *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingAttribute", "<levels width>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| map->width = StringToUnsignedLong(attr); |
| if ( map->width == 0 ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidAttribute", "<levels width>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| |
| attr = GetXMLTreeAttribute(levels, "height"); |
| if ( attr == (char *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingAttribute", "<levels height>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| map->height = StringToUnsignedLong(attr); |
| if ( map->height == 0 ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidAttribute", "<levels height>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| |
| attr = GetXMLTreeAttribute(levels, "divisor"); |
| if ( attr == (char *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingAttribute", "<levels divisor>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| map->divisor = StringToLong(attr); |
| if ( map->divisor < 2 ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidAttribute", "<levels divisor>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| |
| /* Allocate theshold levels array */ |
| content = GetXMLTreeContent(levels); |
| if ( content == (char *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingContent", "<levels>, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| map->levels=(ssize_t *) AcquireQuantumMemory((size_t) map->width,map->height* |
| sizeof(*map->levels)); |
| if ( map->levels == (ssize_t *)NULL ) |
| ThrowFatalException(ResourceLimitFatalError,"UnableToAcquireThresholdMap"); |
| { /* parse levels into integer array */ |
| ssize_t i; |
| char *p; |
| for( i=0; i< (ssize_t) (map->width*map->height); i++) { |
| map->levels[i] = (ssize_t)strtol(content, &p, 10); |
| if ( p == content ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidContent", "<level> too few values, map \"%s\"", map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| if ( map->levels[i] < 0 || map->levels[i] > map->divisor ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidContent", "<level> %.20g out of range, map \"%s\"", |
| (double) map->levels[i],map_id); |
| thresholds = DestroyXMLTree(thresholds); |
| map = DestroyThresholdMap(map); |
| return(map); |
| } |
| content = p; |
| } |
| value=(double) strtol(content,&p,10); |
| if (p != content) |
| { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlInvalidContent", "<level> too many values, map \"%s\"", map_id); |
| thresholds=DestroyXMLTree(thresholds); |
| map=DestroyThresholdMap(map); |
| return(map); |
| } |
| } |
| |
| thresholds = DestroyXMLTree(thresholds); |
| return(map); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % G e t T h r e s h o l d M a p % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % GetThresholdMap() load and search one or more threshold map files for the |
| % a map matching the given name or aliase. |
| % |
| % The format of the GetThresholdMap method is: |
| % |
| % ThresholdMap *GetThresholdMap(const char *map_id, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o map_id: ID of the map to look for. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport ThresholdMap *GetThresholdMap(const char *map_id, |
| ExceptionInfo *exception) |
| { |
| const StringInfo |
| *option; |
| |
| LinkedListInfo |
| *options; |
| |
| ThresholdMap |
| *map; |
| |
| map=(ThresholdMap *)NULL; |
| options=GetConfigureOptions(ThresholdsFilename,exception); |
| while (( option=(const StringInfo *) GetNextValueInLinkedList(options) ) |
| != (const StringInfo *) NULL && map == (ThresholdMap *)NULL ) |
| map=GetThresholdMapFile((const char *) GetStringInfoDatum(option), |
| GetStringInfoPath(option),map_id,exception); |
| options=DestroyConfigureOptions(options); |
| return(map); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| + L i s t T h r e s h o l d M a p F i l e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ListThresholdMapFile() lists the threshold maps and their descriptions |
| % in the given XML file data. |
| % |
| % The format of the ListThresholdMaps method is: |
| % |
| % MagickBooleanType ListThresholdMaps(FILE *file,const char*xml, |
| % const char *filename,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o file: An pointer to the output FILE. |
| % |
| % o xml: The threshold map list in XML format. |
| % |
| % o filename: The threshold map XML filename. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickBooleanType ListThresholdMapFile(FILE *file,const char *xml, |
| const char *filename,ExceptionInfo *exception) |
| { |
| XMLTreeInfo *thresholds,*threshold,*description; |
| const char *map,*alias,*content; |
| |
| assert( xml != (char *)NULL ); |
| assert( file != (FILE *)NULL ); |
| |
| (void) LogMagickEvent(ConfigureEvent,GetMagickModule(), |
| "Loading threshold map file \"%s\" ...",filename); |
| thresholds=NewXMLTree(xml,exception); |
| if ( thresholds == (XMLTreeInfo *)NULL ) |
| return(MagickFalse); |
| |
| (void) fprintf(file,"%-16s %-12s %s\n", "Map", "Alias", "Description"); |
| (void) fprintf(file,"----------------------------------------------------\n"); |
| |
| for( threshold = GetXMLTreeChild(thresholds,"threshold"); |
| threshold != (XMLTreeInfo *)NULL; |
| threshold = GetNextXMLTreeTag(threshold) ) |
| { |
| map = GetXMLTreeAttribute(threshold, "map"); |
| if (map == (char *) NULL) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingAttribute", "<map>"); |
| thresholds=DestroyXMLTree(thresholds); |
| return(MagickFalse); |
| } |
| alias = GetXMLTreeAttribute(threshold, "alias"); |
| /* alias is optional, no if test needed */ |
| description=GetXMLTreeChild(threshold,"description"); |
| if ( description == (XMLTreeInfo *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingElement", "<description>, map \"%s\"", map); |
| thresholds=DestroyXMLTree(thresholds); |
| return(MagickFalse); |
| } |
| content=GetXMLTreeContent(description); |
| if ( content == (char *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "XmlMissingContent", "<description>, map \"%s\"", map); |
| thresholds=DestroyXMLTree(thresholds); |
| return(MagickFalse); |
| } |
| (void) fprintf(file,"%-16s %-12s %s\n",map,alias ? alias : "", content); |
| } |
| thresholds=DestroyXMLTree(thresholds); |
| return(MagickTrue); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % L i s t T h r e s h o l d M a p s % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ListThresholdMaps() lists the threshold maps and their descriptions |
| % as defined by "threshold.xml" to a file. |
| % |
| % The format of the ListThresholdMaps method is: |
| % |
| % MagickBooleanType ListThresholdMaps(FILE *file,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o file: An pointer to the output FILE. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport MagickBooleanType ListThresholdMaps(FILE *file, |
| ExceptionInfo *exception) |
| { |
| const StringInfo |
| *option; |
| |
| LinkedListInfo |
| *options; |
| |
| MagickStatusType |
| status; |
| |
| status=MagickFalse; |
| if ( file == (FILE *)NULL ) |
| file = stdout; |
| options=GetConfigureOptions(ThresholdsFilename,exception); |
| |
| (void) fprintf(file, "\n Threshold Maps for Ordered Dither Operations\n"); |
| |
| while ( ( option=(const StringInfo *) GetNextValueInLinkedList(options) ) |
| != (const StringInfo *) NULL) |
| { |
| (void) fprintf(file,"\nPATH: %s\n\n",GetStringInfoPath(option)); |
| status|=ListThresholdMapFile(file,(const char *) GetStringInfoDatum(option), |
| GetStringInfoPath(option),exception); |
| } |
| options=DestroyConfigureOptions(options); |
| return(status != 0 ? MagickTrue : MagickFalse); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % O r d e r e d D i t h e r I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % OrderedDitherImage() uses the ordered dithering technique of reducing color |
| % images to monochrome using positional information to retain as much |
| % information as possible. |
| % |
| % WARNING: This function is deprecated, and is now just a call to |
| % the more more powerful OrderedPosterizeImage(); function. |
| % |
| % The format of the OrderedDitherImage method is: |
| % |
| % MagickBooleanType OrderedDitherImage(Image *image) |
| % MagickBooleanType OrderedDitherImageChannel(Image *image, |
| % const ChannelType channel,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel or channels to be thresholded. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| |
| MagickExport MagickBooleanType OrderedDitherImage(Image *image) |
| { |
| MagickBooleanType |
| status; |
| |
| status=OrderedDitherImageChannel(image,DefaultChannels,&image->exception); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType OrderedDitherImageChannel(Image *image, |
| const ChannelType channel,ExceptionInfo *exception) |
| { |
| MagickBooleanType |
| status; |
| |
| /* |
| Call the augumented function OrderedPosterizeImage() |
| */ |
| status=OrderedPosterizeImageChannel(image,channel,"o8x8",exception); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % O r d e r e d P o s t e r i z e I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % OrderedPosterizeImage() will perform a ordered dither based on a number |
| % of pre-defined dithering threshold maps, but over multiple intensity |
| % levels, which can be different for different channels, according to the |
| % input argument. |
| % |
| % The format of the OrderedPosterizeImage method is: |
| % |
| % MagickBooleanType OrderedPosterizeImage(Image *image, |
| % const char *threshold_map,ExceptionInfo *exception) |
| % MagickBooleanType OrderedPosterizeImageChannel(Image *image, |
| % const ChannelType channel,const char *threshold_map, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel or channels to be thresholded. |
| % |
| % o threshold_map: A string containing the name of the threshold dither |
| % map to use, followed by zero or more numbers representing the number |
| % of color levels tho dither between. |
| % |
| % Any level number less than 2 will be equivelent to 2, and means only |
| % binary dithering will be applied to each color channel. |
| % |
| % No numbers also means a 2 level (bitmap) dither will be applied to all |
| % channels, while a single number is the number of levels applied to each |
| % channel in sequence. More numbers will be applied in turn to each of |
| % the color channels. |
| % |
| % For example: "o3x3,6" will generate a 6 level posterization of the |
| % image with a ordered 3x3 diffused pixel dither being applied between |
| % each level. While checker,8,8,4 will produce a 332 colormaped image |
| % with only a single checkerboard hash pattern (50% grey) between each |
| % color level, to basically double the number of color levels with |
| % a bare minimim of dithering. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport MagickBooleanType OrderedPosterizeImage(Image *image, |
| const char *threshold_map,ExceptionInfo *exception) |
| { |
| MagickBooleanType |
| status; |
| |
| status=OrderedPosterizeImageChannel(image,DefaultChannels,threshold_map, |
| exception); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType OrderedPosterizeImageChannel(Image *image, |
| const ChannelType channel,const char *threshold_map,ExceptionInfo *exception) |
| { |
| #define DitherImageTag "Dither/Image" |
| |
| CacheView |
| *image_view; |
| |
| LongPixelPacket |
| levels; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| ssize_t |
| y; |
| |
| ThresholdMap |
| *map; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| assert(exception != (ExceptionInfo *) NULL); |
| assert(exception->signature == MagickSignature); |
| if (threshold_map == (const char *) NULL) |
| return(MagickTrue); |
| { |
| char |
| token[MaxTextExtent]; |
| |
| register const char |
| *p; |
| |
| p=(char *)threshold_map; |
| while (((isspace((int) ((unsigned char) *p)) != 0) || (*p == ',')) && |
| (*p != '\0')) |
| p++; |
| threshold_map=p; |
| while (((isspace((int) ((unsigned char) *p)) == 0) && (*p != ',')) && |
| (*p != '\0')) { |
| if ((p-threshold_map) >= MaxTextExtent) |
| break; |
| token[p-threshold_map] = *p; |
| p++; |
| } |
| token[p-threshold_map] = '\0'; |
| map = GetThresholdMap(token, exception); |
| if ( map == (ThresholdMap *)NULL ) { |
| (void) ThrowMagickException(exception,GetMagickModule(),OptionError, |
| "InvalidArgument","%s : '%s'","ordered-dither",threshold_map); |
| return(MagickFalse); |
| } |
| } |
| /* Set channel levels from extra comma seperated arguments |
| Default to 2, the single value given, or individual channel values |
| */ |
| #if 1 |
| { /* parse directly as a comma seperated list of integers */ |
| char *p; |
| |
| p = strchr((char *) threshold_map,','); |
| if ( p != (char *)NULL && isdigit((int) ((unsigned char) *(++p))) ) |
| levels.index = (unsigned int) strtoul(p, &p, 10); |
| else |
| levels.index = 2; |
| |
| levels.red = ((channel & RedChannel ) != 0) ? levels.index : 0; |
| levels.green = ((channel & GreenChannel) != 0) ? levels.index : 0; |
| levels.blue = ((channel & BlueChannel) != 0) ? levels.index : 0; |
| levels.opacity = ((channel & OpacityChannel) != 0) ? levels.index : 0; |
| levels.index = ((channel & IndexChannel) != 0 |
| && (image->colorspace == CMYKColorspace)) ? levels.index : 0; |
| |
| /* if more than a single number, each channel has a separate value */ |
| if ( p != (char *) NULL && *p == ',' ) { |
| p=strchr((char *) threshold_map,','); |
| p++; |
| if ((channel & RedChannel) != 0) |
| levels.red = (unsigned int) strtoul(p, &p, 10), (void)(*p == ',' && p++); |
| if ((channel & GreenChannel) != 0) |
| levels.green = (unsigned int) strtoul(p, &p, 10), (void)(*p == ',' && p++); |
| if ((channel & BlueChannel) != 0) |
| levels.blue = (unsigned int) strtoul(p, &p, 10), (void)(*p == ',' && p++); |
| if ((channel & IndexChannel) != 0 && image->colorspace == CMYKColorspace) |
| levels.index=(unsigned int) strtoul(p, &p, 10), (void)(*p == ',' && p++); |
| if ((channel & OpacityChannel) != 0) |
| levels.opacity = (unsigned int) strtoul(p, &p, 10), (void)(*p == ',' && p++); |
| } |
| } |
| #else |
| /* Parse level values as a geometry */ |
| /* This difficult! |
| * How to map GeometryInfo structure elements into |
| * LongPixelPacket structure elements, but according to channel? |
| * Note the channels list may skip elements!!!! |
| * EG -channel BA -ordered-dither map,2,3 |
| * will need to map g.rho -> l.blue, and g.sigma -> l.opacity |
| * A simpler way is needed, probably converting geometry to a temporary |
| * array, then using channel to advance the index into ssize_t pixel packet. |
| */ |
| #endif |
| |
| #if 0 |
| printf("DEBUG levels r=%u g=%u b=%u a=%u i=%u\n", |
| levels.red, levels.green, levels.blue, levels.opacity, levels.index); |
| #endif |
| |
| { /* Do the posterized ordered dithering of the image */ |
| ssize_t |
| d; |
| |
| /* d = number of psuedo-level divisions added between color levels */ |
| d = map->divisor-1; |
| |
| /* reduce levels to levels - 1 */ |
| levels.red = levels.red ? levels.red-1 : 0; |
| levels.green = levels.green ? levels.green-1 : 0; |
| levels.blue = levels.blue ? levels.blue-1 : 0; |
| levels.opacity = levels.opacity ? levels.opacity-1 : 0; |
| levels.index = levels.index ? levels.index-1 : 0; |
| |
| if (SetImageStorageClass(image,DirectClass) == MagickFalse) |
| { |
| InheritException(exception,&image->exception); |
| return(MagickFalse); |
| } |
| status=MagickTrue; |
| progress=0; |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| register ssize_t |
| threshold, |
| t, |
| l; |
| |
| /* |
| Figure out the dither threshold for this pixel |
| This must be a integer from 1 to map->divisor-1 |
| */ |
| threshold = map->levels[(x%map->width) +map->width*(y%map->height)]; |
| |
| /* Dither each channel in the image as appropriate |
| Notes on the integer Math... |
| total number of divisions = (levels-1)*(divisor-1)+1) |
| t1 = this colors psuedo_level = |
| q->red * total_divisions / (QuantumRange+1) |
| l = posterization level 0..levels |
| t = dither threshold level 0..divisor-1 NB: 0 only on last |
| Each color_level is of size QuantumRange / (levels-1) |
| NB: All input levels and divisor are already had 1 subtracted |
| Opacity is inverted so 'off' represents transparent. |
| */ |
| if (levels.red) { |
| t = (ssize_t) (QuantumScale*q->red*(levels.red*d+1)); |
| l = t/d; t = t-l*d; |
| q->red=(Quantum) ((l+(t >= threshold))*QuantumRange/levels.red); |
| } |
| if (levels.green) { |
| t = (ssize_t) (QuantumScale*q->green*(levels.green*d+1)); |
| l = t/d; t = t-l*d; |
| q->green=(Quantum) ((l+(t >= threshold))*QuantumRange/levels.green); |
| } |
| if (levels.blue) { |
| t = (ssize_t) (QuantumScale*q->blue*(levels.blue*d+1)); |
| l = t/d; t = t-l*d; |
| q->blue=(Quantum) ((l+(t >= threshold))*QuantumRange/levels.blue); |
| } |
| if (levels.opacity) { |
| t = (ssize_t) ((1.0-QuantumScale*q->opacity)*(levels.opacity*d+1)); |
| l = t/d; t = t-l*d; |
| q->opacity=(Quantum) ((1.0-l-(t >= threshold))*QuantumRange/ |
| levels.opacity); |
| } |
| if (levels.index) { |
| t = (ssize_t) (QuantumScale*indexes[x]*(levels.index*d+1)); |
| l = t/d; t = t-l*d; |
| indexes[x]=(IndexPacket) ((l+(t>=threshold))*QuantumRange/ |
| levels.index); |
| } |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_OrderedPosterizeImageChannel) |
| #endif |
| proceed=SetImageProgress(image,DitherImageTag,progress++,image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| } |
| map=DestroyThresholdMap(map); |
| return(MagickTrue); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % R a n d o m T h r e s h o l d I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % RandomThresholdImage() changes the value of individual pixels based on the |
| % intensity of each pixel compared to a random threshold. The result is a |
| % low-contrast, two color image. |
| % |
| % The format of the RandomThresholdImage method is: |
| % |
| % MagickBooleanType RandomThresholdImageChannel(Image *image, |
| % const char *thresholds,ExceptionInfo *exception) |
| % MagickBooleanType RandomThresholdImageChannel(Image *image, |
| % const ChannelType channel,const char *thresholds, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel or channels to be thresholded. |
| % |
| % o thresholds: a geometry string containing low,high thresholds. If the |
| % string contains 2x2, 3x3, or 4x4, an ordered dither of order 2, 3, or 4 |
| % is performed instead. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| |
| MagickExport MagickBooleanType RandomThresholdImage(Image *image, |
| const char *thresholds,ExceptionInfo *exception) |
| { |
| MagickBooleanType |
| status; |
| |
| status=RandomThresholdImageChannel(image,DefaultChannels,thresholds, |
| exception); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType RandomThresholdImageChannel(Image *image, |
| const ChannelType channel,const char *thresholds,ExceptionInfo *exception) |
| { |
| #define ThresholdImageTag "Threshold/Image" |
| |
| CacheView |
| *image_view; |
| |
| GeometryInfo |
| geometry_info; |
| |
| MagickStatusType |
| flags; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| MagickPixelPacket |
| threshold; |
| |
| MagickRealType |
| min_threshold, |
| max_threshold; |
| |
| RandomInfo |
| **restrict random_info; |
| |
| ssize_t |
| y; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| assert(exception != (ExceptionInfo *) NULL); |
| assert(exception->signature == MagickSignature); |
| if (thresholds == (const char *) NULL) |
| return(MagickTrue); |
| GetMagickPixelPacket(image,&threshold); |
| min_threshold=0.0; |
| max_threshold=(MagickRealType) QuantumRange; |
| flags=ParseGeometry(thresholds,&geometry_info); |
| min_threshold=geometry_info.rho; |
| max_threshold=geometry_info.sigma; |
| if ((flags & SigmaValue) == 0) |
| max_threshold=min_threshold; |
| if (strchr(thresholds,'%') != (char *) NULL) |
| { |
| max_threshold*=(MagickRealType) (0.01*QuantumRange); |
| min_threshold*=(MagickRealType) (0.01*QuantumRange); |
| } |
| else |
| if (((max_threshold == min_threshold) || (max_threshold == 1)) && |
| (min_threshold <= 8)) |
| { |
| /* |
| Backward Compatibility -- ordered-dither -- IM v 6.2.9-6. |
| */ |
| status=OrderedPosterizeImageChannel(image,channel,thresholds,exception); |
| return(status); |
| } |
| /* |
| Random threshold image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| if (channel == AllChannels) |
| { |
| if (AcquireImageColormap(image,2) == MagickFalse) |
| ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed", |
| image->filename); |
| random_info=AcquireRandomInfoThreadSet(); |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| const int |
| id = GetOpenMPThreadId(); |
| |
| MagickBooleanType |
| sync; |
| |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1, |
| exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| IndexPacket |
| index; |
| |
| MagickRealType |
| intensity; |
| |
| intensity=(MagickRealType) PixelIntensityToQuantum(q); |
| if (intensity < min_threshold) |
| threshold.index=min_threshold; |
| else if (intensity > max_threshold) |
| threshold.index=max_threshold; |
| else |
| threshold.index=(MagickRealType)(QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| index=(IndexPacket) (intensity <= threshold.index ? 0 : 1); |
| indexes[x]=index; |
| *q++=image->colormap[(ssize_t) index]; |
| } |
| sync=SyncCacheViewAuthenticPixels(image_view,exception); |
| if (sync == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_RandomThresholdImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| random_info=DestroyRandomInfoThreadSet(random_info); |
| return(status); |
| } |
| if (SetImageStorageClass(image,DirectClass) == MagickFalse) |
| { |
| InheritException(exception,&image->exception); |
| return(MagickFalse); |
| } |
| random_info=AcquireRandomInfoThreadSet(); |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| const int |
| id = GetOpenMPThreadId(); |
| |
| register IndexPacket |
| *restrict indexes; |
| |
| register PixelPacket |
| *restrict q; |
| |
| register ssize_t |
| x; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if ((channel & RedChannel) != 0) |
| { |
| if ((MagickRealType) q->red < min_threshold) |
| threshold.red=min_threshold; |
| else |
| if ((MagickRealType) q->red > max_threshold) |
| threshold.red=max_threshold; |
| else |
| threshold.red=(MagickRealType) (QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| } |
| if ((channel & GreenChannel) != 0) |
| { |
| if ((MagickRealType) q->green < min_threshold) |
| threshold.green=min_threshold; |
| else |
| if ((MagickRealType) q->green > max_threshold) |
| threshold.green=max_threshold; |
| else |
| threshold.green=(MagickRealType) (QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| } |
| if ((channel & BlueChannel) != 0) |
| { |
| if ((MagickRealType) q->blue < min_threshold) |
| threshold.blue=min_threshold; |
| else |
| if ((MagickRealType) q->blue > max_threshold) |
| threshold.blue=max_threshold; |
| else |
| threshold.blue=(MagickRealType) (QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| } |
| if ((channel & OpacityChannel) != 0) |
| { |
| if ((MagickRealType) q->opacity < min_threshold) |
| threshold.opacity=min_threshold; |
| else |
| if ((MagickRealType) q->opacity > max_threshold) |
| threshold.opacity=max_threshold; |
| else |
| threshold.opacity=(MagickRealType) (QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| } |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace)) |
| { |
| if ((MagickRealType) indexes[x] < min_threshold) |
| threshold.index=min_threshold; |
| else |
| if ((MagickRealType) indexes[x] > max_threshold) |
| threshold.index=max_threshold; |
| else |
| threshold.index=(MagickRealType) (QuantumRange* |
| GetPseudoRandomValue(random_info[id])); |
| } |
| if ((channel & RedChannel) != 0) |
| q->red=(Quantum) ((MagickRealType) q->red <= threshold.red ? 0 : |
| QuantumRange); |
| if ((channel & GreenChannel) != 0) |
| q->green=(Quantum) ((MagickRealType) q->green <= threshold.green ? 0 : |
| QuantumRange); |
| if ((channel & BlueChannel) != 0) |
| q->blue=(Quantum) ((MagickRealType) q->blue <= threshold.blue ? 0 : |
| QuantumRange); |
| if ((channel & OpacityChannel) != 0) |
| q->opacity=(Quantum) ((MagickRealType) q->opacity <= threshold.opacity ? |
| 0 : QuantumRange); |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace)) |
| indexes[x]=(IndexPacket) ((MagickRealType) indexes[x] <= |
| threshold.index ? 0 : QuantumRange); |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_RandomThresholdImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| random_info=DestroyRandomInfoThreadSet(random_info); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % W h i t e T h r e s h o l d I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % WhiteThresholdImage() is like ThresholdImage() but forces all pixels above |
| % the threshold into white while leaving all pixels at or below the threshold |
| % unchanged. |
| % |
| % The format of the WhiteThresholdImage method is: |
| % |
| % MagickBooleanType WhiteThresholdImage(Image *image,const char *threshold) |
| % MagickBooleanType WhiteThresholdImageChannel(Image *image, |
| % const ChannelType channel,const char *threshold, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o channel: the channel or channels to be thresholded. |
| % |
| % o threshold: Define the threshold value. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport MagickBooleanType WhiteThresholdImage(Image *image, |
| const char *threshold) |
| { |
| MagickBooleanType |
| status; |
| |
| status=WhiteThresholdImageChannel(image,DefaultChannels,threshold, |
| &image->exception); |
| return(status); |
| } |
| |
| MagickExport MagickBooleanType WhiteThresholdImageChannel(Image *image, |
| const ChannelType channel,const char *thresholds,ExceptionInfo *exception) |
| { |
| #define ThresholdImageTag "Threshold/Image" |
| |
| CacheView |
| *image_view; |
| |
| GeometryInfo |
| geometry_info; |
| |
| MagickBooleanType |
| status; |
| |
| MagickPixelPacket |
| threshold; |
| |
| MagickOffsetType |
| progress; |
| |
| MagickStatusType |
| flags; |
| |
| ssize_t |
| y; |
| |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| if (thresholds == (const char *) NULL) |
| return(MagickTrue); |
| if (SetImageStorageClass(image,DirectClass) == MagickFalse) |
| return(MagickFalse); |
| flags=ParseGeometry(thresholds,&geometry_info); |
| GetMagickPixelPacket(image,&threshold); |
| threshold.red=geometry_info.rho; |
| threshold.green=geometry_info.sigma; |
| if ((flags & SigmaValue) == 0) |
| threshold.green=threshold.red; |
| threshold.blue=geometry_info.xi; |
| if ((flags & XiValue) == 0) |
| threshold.blue=threshold.red; |
| threshold.opacity=geometry_info.psi; |
| if ((flags & PsiValue) == 0) |
| threshold.opacity=threshold.red; |
| threshold.index=geometry_info.chi; |
| if ((flags & ChiValue) == 0) |
| threshold.index=threshold.red; |
| if ((flags & PercentValue) != 0) |
| { |
| threshold.red*=(QuantumRange/100.0); |
| threshold.green*=(QuantumRange/100.0); |
| threshold.blue*=(QuantumRange/100.0); |
| threshold.opacity*=(QuantumRange/100.0); |
| threshold.index*=(QuantumRange/100.0); |
| } |
| /* |
| White threshold image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| image_view=AcquireCacheView(image); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(dynamic,4) shared(progress,status) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register IndexPacket |
| *restrict indexes; |
| |
| register ssize_t |
| x; |
| |
| register PixelPacket |
| *restrict q; |
| |
| if (status == MagickFalse) |
| continue; |
| q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); |
| if (q == (PixelPacket *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| indexes=GetCacheViewAuthenticIndexQueue(image_view); |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if (channel != DefaultChannels) |
| { |
| if (PixelIntensity(q) > MagickPixelIntensity(&threshold)) |
| { |
| q->red=(Quantum) QuantumRange; |
| q->green=(Quantum) QuantumRange; |
| q->blue=(Quantum) QuantumRange; |
| if (image->colorspace == CMYKColorspace) |
| indexes[x]=(Quantum) QuantumRange; |
| } |
| } |
| else |
| { |
| if (((channel & RedChannel) != 0) && |
| ((MagickRealType) q->red > threshold.red)) |
| q->red=(Quantum) QuantumRange; |
| if (((channel & GreenChannel) != 0) && |
| ((MagickRealType) q->green > threshold.green)) |
| q->green=(Quantum) QuantumRange; |
| if (((channel & BlueChannel) != 0) && |
| ((MagickRealType) q->blue > threshold.blue)) |
| q->blue=(Quantum) QuantumRange; |
| if (((channel & OpacityChannel) != 0) && |
| ((MagickRealType) q->opacity > threshold.opacity)) |
| q->opacity=(Quantum) QuantumRange; |
| if (((channel & IndexChannel) != 0) && |
| (image->colorspace == CMYKColorspace) && |
| ((MagickRealType) indexes[x] > threshold.index)) |
| indexes[x]=(Quantum) QuantumRange; |
| } |
| q++; |
| } |
| if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_WhiteThresholdImageChannel) |
| #endif |
| proceed=SetImageProgress(image,ThresholdImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |