| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % SSSSS H H EEEEE AAA RRRR % |
| % SS H H E A A R R % |
| % SSS HHHHH EEE AAAAA RRRR % |
| % SS H H E A A R R % |
| % SSSSS H H EEEEE A A R R % |
| % % |
| % % |
| % MagickCore Methods to Shear or Rotate an Image by an Arbitrary Angle % |
| % % |
| % Software Design % |
| % John Cristy % |
| % July 1992 % |
| % % |
| % % |
| % Copyright 1999-2012 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. % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % The XShearImage() and YShearImage() methods are based on the paper "A Fast |
| % Algorithm for General Raster Rotatation" by Alan W. Paeth, Graphics |
| % Interface '86 (Vancouver). ShearRotateImage() is adapted from a similar |
| % method based on the Paeth paper written by Michael Halle of the Spatial |
| % Imaging Group, MIT Media Lab. |
| % |
| */ |
| |
| /* |
| Include declarations. |
| */ |
| #include "MagickCore/studio.h" |
| #include "MagickCore/artifact.h" |
| #include "MagickCore/attribute.h" |
| #include "MagickCore/blob-private.h" |
| #include "MagickCore/cache-private.h" |
| #include "MagickCore/color-private.h" |
| #include "MagickCore/colorspace-private.h" |
| #include "MagickCore/composite.h" |
| #include "MagickCore/composite-private.h" |
| #include "MagickCore/decorate.h" |
| #include "MagickCore/distort.h" |
| #include "MagickCore/draw.h" |
| #include "MagickCore/exception.h" |
| #include "MagickCore/exception-private.h" |
| #include "MagickCore/gem.h" |
| #include "MagickCore/geometry.h" |
| #include "MagickCore/image.h" |
| #include "MagickCore/image-private.h" |
| #include "MagickCore/memory_.h" |
| #include "MagickCore/list.h" |
| #include "MagickCore/monitor.h" |
| #include "MagickCore/monitor-private.h" |
| #include "MagickCore/nt-base-private.h" |
| #include "MagickCore/pixel-accessor.h" |
| #include "MagickCore/quantum.h" |
| #include "MagickCore/resource_.h" |
| #include "MagickCore/shear.h" |
| #include "MagickCore/statistic.h" |
| #include "MagickCore/string_.h" |
| #include "MagickCore/string-private.h" |
| #include "MagickCore/thread-private.h" |
| #include "MagickCore/threshold.h" |
| #include "MagickCore/transform.h" |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| + C r o p T o F i t I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % CropToFitImage() crops the sheared image as determined by the bounding box |
| % as defined by width and height and shearing angles. |
| % |
| % The format of the CropToFitImage method is: |
| % |
| % MagickBooleanType CropToFitImage(Image **image, |
| % const MagickRealType x_shear,const MagickRealType x_shear, |
| % const MagickRealType width,const MagickRealType height, |
| % const MagickBooleanType rotate,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o x_shear, y_shear, width, height: Defines a region of the image to crop. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| static MagickBooleanType CropToFitImage(Image **image, |
| const MagickRealType x_shear,const MagickRealType y_shear, |
| const MagickRealType width,const MagickRealType height, |
| const MagickBooleanType rotate,ExceptionInfo *exception) |
| { |
| Image |
| *crop_image; |
| |
| PointInfo |
| extent[4], |
| min, |
| max; |
| |
| RectangleInfo |
| geometry, |
| page; |
| |
| register ssize_t |
| i; |
| |
| /* |
| Calculate the rotated image size. |
| */ |
| extent[0].x=(double) (-width/2.0); |
| extent[0].y=(double) (-height/2.0); |
| extent[1].x=(double) width/2.0; |
| extent[1].y=(double) (-height/2.0); |
| extent[2].x=(double) (-width/2.0); |
| extent[2].y=(double) height/2.0; |
| extent[3].x=(double) width/2.0; |
| extent[3].y=(double) height/2.0; |
| for (i=0; i < 4; i++) |
| { |
| extent[i].x+=x_shear*extent[i].y; |
| extent[i].y+=y_shear*extent[i].x; |
| if (rotate != MagickFalse) |
| extent[i].x+=x_shear*extent[i].y; |
| extent[i].x+=(double) (*image)->columns/2.0; |
| extent[i].y+=(double) (*image)->rows/2.0; |
| } |
| min=extent[0]; |
| max=extent[0]; |
| for (i=1; i < 4; i++) |
| { |
| if (min.x > extent[i].x) |
| min.x=extent[i].x; |
| if (min.y > extent[i].y) |
| min.y=extent[i].y; |
| if (max.x < extent[i].x) |
| max.x=extent[i].x; |
| if (max.y < extent[i].y) |
| max.y=extent[i].y; |
| } |
| geometry.x=(ssize_t) ceil(min.x-0.5); |
| geometry.y=(ssize_t) ceil(min.y-0.5); |
| geometry.width=(size_t) floor(max.x-min.x+0.5); |
| geometry.height=(size_t) floor(max.y-min.y+0.5); |
| page=(*image)->page; |
| (void) ParseAbsoluteGeometry("0x0+0+0",&(*image)->page); |
| crop_image=CropImage(*image,&geometry,exception); |
| if (crop_image == (Image *) NULL) |
| return(MagickFalse); |
| crop_image->page=page; |
| *image=DestroyImage(*image); |
| *image=crop_image; |
| return(MagickTrue); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % D e s k e w I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % DeskewImage() removes skew from the image. Skew is an artifact that |
| % occurs in scanned images because of the camera being misaligned, |
| % imperfections in the scanning or surface, or simply because the paper was |
| % not placed completely flat when scanned. |
| % |
| % The format of the DeskewImage method is: |
| % |
| % Image *DeskewImage(const Image *image,const double threshold, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o image: the image. |
| % |
| % o threshold: separate background from foreground. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| |
| typedef struct _RadonInfo |
| { |
| CacheType |
| type; |
| |
| size_t |
| width, |
| height; |
| |
| MagickSizeType |
| length; |
| |
| MagickBooleanType |
| mapped; |
| |
| char |
| path[MaxTextExtent]; |
| |
| int |
| file; |
| |
| unsigned short |
| *cells; |
| } RadonInfo; |
| |
| static RadonInfo *DestroyRadonInfo(RadonInfo *radon_info) |
| { |
| assert(radon_info != (RadonInfo *) NULL); |
| switch (radon_info->type) |
| { |
| case MemoryCache: |
| { |
| if (radon_info->mapped == MagickFalse) |
| radon_info->cells=(unsigned short *) RelinquishMagickMemory( |
| radon_info->cells); |
| else |
| radon_info->cells=(unsigned short *) UnmapBlob(radon_info->cells, |
| (size_t) radon_info->length); |
| RelinquishMagickResource(MemoryResource,radon_info->length); |
| break; |
| } |
| case MapCache: |
| { |
| radon_info->cells=(unsigned short *) UnmapBlob(radon_info->cells,(size_t) |
| radon_info->length); |
| RelinquishMagickResource(MapResource,radon_info->length); |
| } |
| case DiskCache: |
| { |
| if (radon_info->file != -1) |
| (void) close(radon_info->file); |
| (void) RelinquishUniqueFileResource(radon_info->path); |
| RelinquishMagickResource(DiskResource,radon_info->length); |
| break; |
| } |
| default: |
| break; |
| } |
| return((RadonInfo *) RelinquishMagickMemory(radon_info)); |
| } |
| |
| static MagickBooleanType ResetRadonCells(RadonInfo *radon_info) |
| { |
| register ssize_t |
| x; |
| |
| ssize_t |
| count, |
| y; |
| |
| unsigned short |
| value; |
| |
| if (radon_info->type != DiskCache) |
| { |
| (void) ResetMagickMemory(radon_info->cells,0,(size_t) radon_info->length); |
| return(MagickTrue); |
| } |
| value=0; |
| (void) lseek(radon_info->file,0,SEEK_SET); |
| for (y=0; y < (ssize_t) radon_info->height; y++) |
| { |
| for (x=0; x < (ssize_t) radon_info->width; x++) |
| { |
| count=write(radon_info->file,&value,sizeof(*radon_info->cells)); |
| if (count != (ssize_t) sizeof(*radon_info->cells)) |
| break; |
| } |
| if (x < (ssize_t) radon_info->width) |
| break; |
| } |
| return(y < (ssize_t) radon_info->height ? MagickFalse : MagickTrue); |
| } |
| |
| static RadonInfo *AcquireRadonInfo(const Image *image,const size_t width, |
| const size_t height,ExceptionInfo *exception) |
| { |
| MagickBooleanType |
| status; |
| |
| RadonInfo |
| *radon_info; |
| |
| radon_info=(RadonInfo *) AcquireMagickMemory(sizeof(*radon_info)); |
| if (radon_info == (RadonInfo *) NULL) |
| return((RadonInfo *) NULL); |
| (void) ResetMagickMemory(radon_info,0,sizeof(*radon_info)); |
| radon_info->width=width; |
| radon_info->height=height; |
| radon_info->length=(MagickSizeType) width*height*sizeof(*radon_info->cells); |
| radon_info->type=MemoryCache; |
| status=AcquireMagickResource(AreaResource,radon_info->length); |
| if ((status != MagickFalse) && |
| (radon_info->length == (MagickSizeType) ((size_t) radon_info->length))) |
| { |
| status=AcquireMagickResource(MemoryResource,radon_info->length); |
| if (status != MagickFalse) |
| { |
| radon_info->mapped=MagickFalse; |
| radon_info->cells=(unsigned short *) AcquireMagickMemory((size_t) |
| radon_info->length); |
| if (radon_info->cells == (unsigned short *) NULL) |
| { |
| radon_info->mapped=MagickTrue; |
| radon_info->cells=(unsigned short *) MapBlob(-1,IOMode,0,(size_t) |
| radon_info->length); |
| } |
| if (radon_info->cells == (unsigned short *) NULL) |
| RelinquishMagickResource(MemoryResource,radon_info->length); |
| } |
| } |
| radon_info->file=(-1); |
| if (radon_info->cells == (unsigned short *) NULL) |
| { |
| status=AcquireMagickResource(DiskResource,radon_info->length); |
| if (status == MagickFalse) |
| { |
| (void) ThrowMagickException(exception,GetMagickModule(),CacheError, |
| "CacheResourcesExhausted","'%s'",image->filename); |
| return(DestroyRadonInfo(radon_info)); |
| } |
| radon_info->type=DiskCache; |
| (void) AcquireMagickResource(MemoryResource,radon_info->length); |
| radon_info->file=AcquireUniqueFileResource(radon_info->path); |
| if (radon_info->file == -1) |
| return(DestroyRadonInfo(radon_info)); |
| status=AcquireMagickResource(MapResource,radon_info->length); |
| if (status != MagickFalse) |
| { |
| status=ResetRadonCells(radon_info); |
| if (status != MagickFalse) |
| { |
| radon_info->cells=(unsigned short *) MapBlob(radon_info->file, |
| IOMode,0,(size_t) radon_info->length); |
| if (radon_info->cells != (unsigned short *) NULL) |
| radon_info->type=MapCache; |
| else |
| RelinquishMagickResource(MapResource,radon_info->length); |
| } |
| } |
| } |
| return(radon_info); |
| } |
| |
| static inline size_t MagickMin(const size_t x,const size_t y) |
| { |
| if (x < y) |
| return(x); |
| return(y); |
| } |
| |
| static inline ssize_t ReadRadonCell(const RadonInfo *radon_info, |
| const MagickOffsetType offset,const size_t length,unsigned char *buffer) |
| { |
| register ssize_t |
| i; |
| |
| ssize_t |
| count; |
| |
| #if !defined(MAGICKCORE_HAVE_PPREAD) |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_ReadRadonCell) |
| #endif |
| { |
| i=(-1); |
| if (lseek(radon_info->file,offset,SEEK_SET) >= 0) |
| { |
| #endif |
| count=0; |
| for (i=0; i < (ssize_t) length; i+=count) |
| { |
| #if !defined(MAGICKCORE_HAVE_PPREAD) |
| count=read(radon_info->file,buffer+i,MagickMin(length-i,(size_t) |
| SSIZE_MAX)); |
| #else |
| count=pread(radon_info->file,buffer+i,MagickMin(length-i,(size_t) |
| SSIZE_MAX),offset+i); |
| #endif |
| if (count > 0) |
| continue; |
| count=0; |
| if (errno != EINTR) |
| { |
| i=(-1); |
| break; |
| } |
| } |
| #if !defined(MAGICKCORE_HAVE_PPREAD) |
| } |
| } |
| #endif |
| return(i); |
| } |
| |
| static inline ssize_t WriteRadonCell(const RadonInfo *radon_info, |
| const MagickOffsetType offset,const size_t length,const unsigned char *buffer) |
| { |
| register ssize_t |
| i; |
| |
| ssize_t |
| count; |
| |
| #if !defined(MAGICKCORE_HAVE_PWRITE) |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_WriteRadonCell) |
| #endif |
| { |
| if (lseek(radon_info->file,offset,SEEK_SET) >= 0) |
| { |
| #endif |
| count=0; |
| for (i=0; i < (ssize_t) length; i+=count) |
| { |
| #if !defined(MAGICKCORE_HAVE_PWRITE) |
| count=write(radon_info->file,buffer+i,MagickMin(length-i,(size_t) |
| SSIZE_MAX)); |
| #else |
| count=pwrite(radon_info->file,buffer+i,MagickMin(length-i,(size_t) |
| SSIZE_MAX),offset+i); |
| #endif |
| if (count > 0) |
| continue; |
| count=0; |
| if (errno != EINTR) |
| { |
| i=(-1); |
| break; |
| } |
| } |
| #if !defined(MAGICKCORE_HAVE_PWRITE) |
| } |
| } |
| #endif |
| return(i); |
| } |
| |
| static inline unsigned short GetRadonCell(const RadonInfo *radon_info, |
| const ssize_t x,const ssize_t y) |
| { |
| MagickOffsetType |
| i; |
| |
| unsigned short |
| value; |
| |
| i=(MagickOffsetType) radon_info->height*x+y; |
| if ((i < 0) || |
| ((MagickSizeType) (i*sizeof(*radon_info->cells)) >= radon_info->length)) |
| return(0); |
| if (radon_info->type != DiskCache) |
| return(radon_info->cells[i]); |
| value=0; |
| (void) ReadRadonCell(radon_info,i*sizeof(*radon_info->cells), |
| sizeof(*radon_info->cells),(unsigned char *) &value); |
| return(value); |
| } |
| |
| static inline MagickBooleanType SetRadonCell(const RadonInfo *radon_info, |
| const ssize_t x,const ssize_t y,const unsigned short value) |
| { |
| MagickOffsetType |
| i; |
| |
| ssize_t |
| count; |
| |
| i=(MagickOffsetType) radon_info->height*x+y; |
| if ((i < 0) || |
| ((MagickSizeType) (i*sizeof(*radon_info->cells)) >= radon_info->length)) |
| return(MagickFalse); |
| if (radon_info->type != DiskCache) |
| { |
| radon_info->cells[i]=value; |
| return(MagickTrue); |
| } |
| count=WriteRadonCell(radon_info,i*sizeof(*radon_info->cells), |
| sizeof(*radon_info->cells),(const unsigned char *) &value); |
| if (count != (ssize_t) sizeof(*radon_info->cells)) |
| return(MagickFalse); |
| return(MagickTrue); |
| } |
| |
| static void RadonProjection(const Image *image,RadonInfo *source_cells, |
| RadonInfo *destination_cells,const ssize_t sign,size_t *projection) |
| { |
| RadonInfo |
| *swap; |
| |
| register ssize_t |
| x; |
| |
| register RadonInfo |
| *p, |
| *q; |
| |
| size_t |
| step; |
| |
| p=source_cells; |
| q=destination_cells; |
| for (step=1; step < p->width; step*=2) |
| { |
| for (x=0; x < (ssize_t) p->width; x+=2*(ssize_t) step) |
| { |
| register ssize_t |
| i; |
| |
| ssize_t |
| y; |
| |
| unsigned short |
| cell; |
| |
| for (i=0; i < (ssize_t) step; i++) |
| { |
| for (y=0; y < (ssize_t) (p->height-i-1); y++) |
| { |
| cell=GetRadonCell(p,x+i,y); |
| (void) SetRadonCell(q,x+2*i,y,cell+GetRadonCell(p,x+i+(ssize_t) |
| step,y+i)); |
| (void) SetRadonCell(q,x+2*i+1,y,cell+GetRadonCell(p,x+i+(ssize_t) |
| step,y+i+1)); |
| } |
| for ( ; y < (ssize_t) (p->height-i); y++) |
| { |
| cell=GetRadonCell(p,x+i,y); |
| (void) SetRadonCell(q,x+2*i,y,cell+GetRadonCell(p,x+i+(ssize_t) step, |
| y+i)); |
| (void) SetRadonCell(q,x+2*i+1,y,cell); |
| } |
| for ( ; y < (ssize_t) p->height; y++) |
| { |
| cell=GetRadonCell(p,x+i,y); |
| (void) SetRadonCell(q,x+2*i,y,cell); |
| (void) SetRadonCell(q,x+2*i+1,y,cell); |
| } |
| } |
| } |
| swap=p; |
| p=q; |
| q=swap; |
| } |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) \ |
| dynamic_number_threads(image,p->width,p->height,1) |
| #endif |
| for (x=0; x < (ssize_t) p->width; x++) |
| { |
| register ssize_t |
| y; |
| |
| size_t |
| sum; |
| |
| sum=0; |
| for (y=0; y < (ssize_t) (p->height-1); y++) |
| { |
| ssize_t |
| delta; |
| |
| delta=GetRadonCell(p,x,y)-(ssize_t) GetRadonCell(p,x,y+1); |
| sum+=delta*delta; |
| } |
| projection[p->width+sign*x-1]=sum; |
| } |
| } |
| |
| static MagickBooleanType RadonTransform(const Image *image, |
| const double threshold,size_t *projection,ExceptionInfo *exception) |
| { |
| CacheView |
| *image_view; |
| |
| MagickBooleanType |
| status; |
| |
| RadonInfo |
| *destination_cells, |
| *source_cells; |
| |
| register ssize_t |
| i; |
| |
| size_t |
| count, |
| width; |
| |
| ssize_t |
| y; |
| |
| unsigned char |
| byte; |
| |
| unsigned short |
| bits[256]; |
| |
| for (width=1; width < ((image->columns+7)/8); width<<=1) ; |
| source_cells=AcquireRadonInfo(image,width,image->rows,exception); |
| destination_cells=AcquireRadonInfo(image,width,image->rows,exception); |
| if ((source_cells == (RadonInfo *) NULL) || |
| (destination_cells == (RadonInfo *) NULL)) |
| { |
| if (destination_cells != (RadonInfo *) NULL) |
| destination_cells=DestroyRadonInfo(destination_cells); |
| if (source_cells != (RadonInfo *) NULL) |
| source_cells=DestroyRadonInfo(source_cells); |
| return(MagickFalse); |
| } |
| if (ResetRadonCells(source_cells) == MagickFalse) |
| { |
| destination_cells=DestroyRadonInfo(destination_cells); |
| source_cells=DestroyRadonInfo(source_cells); |
| return(MagickFalse); |
| } |
| for (i=0; i < 256; i++) |
| { |
| byte=(unsigned char) i; |
| for (count=0; byte != 0; byte>>=1) |
| count+=byte & 0x01; |
| bits[i]=(unsigned short) count; |
| } |
| status=MagickTrue; |
| image_view=AcquireVirtualCacheView(image,exception); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(status) \ |
| dynamic_number_threads(image,image->columns,image->rows,1) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register const Quantum |
| *restrict p; |
| |
| register ssize_t |
| i, |
| x; |
| |
| size_t |
| bit, |
| byte; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); |
| if (p == (const Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| bit=0; |
| byte=0; |
| i=(ssize_t) (image->columns+7)/8; |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| byte<<=1; |
| if ((double) GetPixelIntensity(image,p) < threshold) |
| byte|=0x01; |
| bit++; |
| if (bit == 8) |
| { |
| (void) SetRadonCell(source_cells,--i,y,bits[byte]); |
| bit=0; |
| byte=0; |
| } |
| p+=GetPixelChannels(image); |
| } |
| if (bit != 0) |
| { |
| byte<<=(8-bit); |
| (void) SetRadonCell(source_cells,--i,y,bits[byte]); |
| } |
| } |
| RadonProjection(image,source_cells,destination_cells,-1,projection); |
| (void) ResetRadonCells(source_cells); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(status) \ |
| dynamic_number_threads(image,image->columns,image->rows,1) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register const Quantum |
| *restrict p; |
| |
| register ssize_t |
| i, |
| x; |
| |
| size_t |
| bit, |
| byte; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); |
| if (p == (const Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| bit=0; |
| byte=0; |
| i=0; |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| byte<<=1; |
| if ((double) GetPixelIntensity(image,p) < threshold) |
| byte|=0x01; |
| bit++; |
| if (bit == 8) |
| { |
| (void) SetRadonCell(source_cells,i++,y,bits[byte]); |
| bit=0; |
| byte=0; |
| } |
| p+=GetPixelChannels(image); |
| } |
| if (bit != 0) |
| { |
| byte<<=(8-bit); |
| (void) SetRadonCell(source_cells,i++,y,bits[byte]); |
| } |
| } |
| RadonProjection(image,source_cells,destination_cells,1,projection); |
| image_view=DestroyCacheView(image_view); |
| destination_cells=DestroyRadonInfo(destination_cells); |
| source_cells=DestroyRadonInfo(source_cells); |
| return(MagickTrue); |
| } |
| |
| static void GetImageBackgroundColor(Image *image,const ssize_t offset, |
| ExceptionInfo *exception) |
| { |
| CacheView |
| *image_view; |
| |
| PixelInfo |
| background; |
| |
| MagickRealType |
| count; |
| |
| ssize_t |
| y; |
| |
| /* |
| Compute average background color. |
| */ |
| if (offset <= 0) |
| return; |
| GetPixelInfo(image,&background); |
| count=0.0; |
| image_view=AcquireVirtualCacheView(image,exception); |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| register const Quantum |
| *restrict p; |
| |
| register ssize_t |
| x; |
| |
| if ((y >= offset) && (y < ((ssize_t) image->rows-offset))) |
| continue; |
| p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); |
| if (p == (const Quantum *) NULL) |
| continue; |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| if ((x >= offset) && (x < ((ssize_t) image->columns-offset))) |
| continue; |
| background.red+=QuantumScale*GetPixelRed(image,p); |
| background.green+=QuantumScale*GetPixelGreen(image,p); |
| background.blue+=QuantumScale*GetPixelBlue(image,p); |
| if ((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) |
| background.alpha+=QuantumScale*GetPixelAlpha(image,p); |
| count++; |
| p+=GetPixelChannels(image); |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| image->background_color.red=(double) ClampToQuantum(QuantumRange* |
| background.red/count); |
| image->background_color.green=(double) ClampToQuantum(QuantumRange* |
| background.green/count); |
| image->background_color.blue=(double) ClampToQuantum(QuantumRange* |
| background.blue/count); |
| if ((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) |
| image->background_color.alpha=(double) ClampToQuantum(QuantumRange* |
| background.alpha/count); |
| } |
| |
| MagickExport Image *DeskewImage(const Image *image,const double threshold, |
| ExceptionInfo *exception) |
| { |
| AffineMatrix |
| affine_matrix; |
| |
| const char |
| *artifact; |
| |
| double |
| degrees; |
| |
| Image |
| *clone_image, |
| *crop_image, |
| *deskew_image, |
| *median_image; |
| |
| MagickBooleanType |
| status; |
| |
| RectangleInfo |
| geometry; |
| |
| register ssize_t |
| i; |
| |
| size_t |
| max_projection, |
| *projection, |
| width; |
| |
| ssize_t |
| skew; |
| |
| /* |
| Compute deskew angle. |
| */ |
| for (width=1; width < ((image->columns+7)/8); width<<=1) ; |
| projection=(size_t *) AcquireQuantumMemory((size_t) (2*width-1), |
| sizeof(*projection)); |
| if (projection == (size_t *) NULL) |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| status=RadonTransform(image,threshold,projection,exception); |
| if (status == MagickFalse) |
| { |
| projection=(size_t *) RelinquishMagickMemory(projection); |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| } |
| max_projection=0; |
| skew=0; |
| for (i=0; i < (ssize_t) (2*width-1); i++) |
| { |
| if (projection[i] > max_projection) |
| { |
| skew=i-(ssize_t) width+1; |
| max_projection=projection[i]; |
| } |
| } |
| projection=(size_t *) RelinquishMagickMemory(projection); |
| /* |
| Deskew image. |
| */ |
| clone_image=CloneImage(image,0,0,MagickTrue,exception); |
| if (clone_image == (Image *) NULL) |
| return((Image *) NULL); |
| (void) SetImageVirtualPixelMethod(clone_image,BackgroundVirtualPixelMethod, |
| exception); |
| degrees=RadiansToDegrees(-atan((double) skew/width/8)); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TransformEvent,GetMagickModule(), |
| " Deskew angle: %g",degrees); |
| affine_matrix.sx=cos(DegreesToRadians(fmod((double) degrees,360.0))); |
| affine_matrix.rx=sin(DegreesToRadians(fmod((double) degrees,360.0))); |
| affine_matrix.ry=(-sin(DegreesToRadians(fmod((double) degrees,360.0)))); |
| affine_matrix.sy=cos(DegreesToRadians(fmod((double) degrees,360.0))); |
| affine_matrix.tx=0.0; |
| affine_matrix.ty=0.0; |
| artifact=GetImageArtifact(image,"deskew:auto-crop"); |
| if (artifact == (const char *) NULL) |
| { |
| deskew_image=AffineTransformImage(clone_image,&affine_matrix,exception); |
| clone_image=DestroyImage(clone_image); |
| return(deskew_image); |
| } |
| /* |
| Auto-crop image. |
| */ |
| GetImageBackgroundColor(clone_image,(ssize_t) StringToLong(artifact), |
| exception); |
| deskew_image=AffineTransformImage(clone_image,&affine_matrix,exception); |
| clone_image=DestroyImage(clone_image); |
| if (deskew_image == (Image *) NULL) |
| return((Image *) NULL); |
| median_image=StatisticImage(deskew_image,MedianStatistic,3,3,exception); |
| if (median_image == (Image *) NULL) |
| { |
| deskew_image=DestroyImage(deskew_image); |
| return((Image *) NULL); |
| } |
| geometry=GetImageBoundingBox(median_image,exception); |
| median_image=DestroyImage(median_image); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TransformEvent,GetMagickModule()," Deskew geometry: " |
| "%.20gx%.20g%+.20g%+.20g",(double) geometry.width,(double) |
| geometry.height,(double) geometry.x,(double) geometry.y); |
| crop_image=CropImage(deskew_image,&geometry,exception); |
| deskew_image=DestroyImage(deskew_image); |
| return(crop_image); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % I n t e g r a l R o t a t e I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % IntegralRotateImage() rotates the image an integral of 90 degrees. It |
| % allocates the memory necessary for the new Image structure and returns a |
| % pointer to the rotated image. |
| % |
| % The format of the IntegralRotateImage method is: |
| % |
| % Image *IntegralRotateImage(const Image *image,size_t rotations, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o rotations: Specifies the number of 90 degree rotations. |
| % |
| */ |
| MagickExport Image *IntegralRotateImage(const Image *image,size_t rotations, |
| ExceptionInfo *exception) |
| { |
| #define RotateImageTag "Rotate/Image" |
| |
| CacheView |
| *image_view, |
| *rotate_view; |
| |
| Image |
| *rotate_image; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| RectangleInfo |
| page; |
| |
| ssize_t |
| y; |
| |
| /* |
| Initialize rotated image attributes. |
| */ |
| assert(image != (Image *) NULL); |
| page=image->page; |
| rotations%=4; |
| if (rotations == 0) |
| return(CloneImage(image,0,0,MagickTrue,exception)); |
| if ((rotations == 1) || (rotations == 3)) |
| rotate_image=CloneImage(image,image->rows,image->columns,MagickTrue, |
| exception); |
| else |
| rotate_image=CloneImage(image,image->columns,image->rows,MagickTrue, |
| exception); |
| if (rotate_image == (Image *) NULL) |
| return((Image *) NULL); |
| /* |
| Integral rotate the image. |
| */ |
| status=MagickTrue; |
| progress=0; |
| image_view=AcquireVirtualCacheView(image,exception); |
| rotate_view=AcquireAuthenticCacheView(rotate_image,exception); |
| switch (rotations) |
| { |
| case 0: |
| { |
| /* |
| Rotate 0 degrees. |
| */ |
| break; |
| } |
| case 1: |
| { |
| size_t |
| tile_height, |
| tile_width; |
| |
| ssize_t |
| tile_y; |
| |
| /* |
| Rotate 90 degrees. |
| */ |
| GetPixelCacheTileSize(image,&tile_width,&tile_height); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(progress,status) \ |
| dynamic_number_threads(image,image->columns,image->rows,1) |
| #endif |
| for (tile_y=0; tile_y < (ssize_t) image->rows; tile_y+=(ssize_t) tile_height) |
| { |
| register ssize_t |
| tile_x; |
| |
| if (status == MagickFalse) |
| continue; |
| tile_x=0; |
| for ( ; tile_x < (ssize_t) image->columns; tile_x+=(ssize_t) tile_width) |
| { |
| MagickBooleanType |
| sync; |
| |
| register const Quantum |
| *restrict p; |
| |
| register Quantum |
| *restrict q; |
| |
| register ssize_t |
| y; |
| |
| size_t |
| height, |
| width; |
| |
| width=tile_width; |
| if ((tile_x+(ssize_t) tile_width) > (ssize_t) image->columns) |
| width=(size_t) (tile_width-(tile_x+tile_width-image->columns)); |
| height=tile_height; |
| if ((tile_y+(ssize_t) tile_height) > (ssize_t) image->rows) |
| height=(size_t) (tile_height-(tile_y+tile_height-image->rows)); |
| p=GetCacheViewVirtualPixels(image_view,tile_x,tile_y,width,height, |
| exception); |
| if (p == (const Quantum *) NULL) |
| { |
| status=MagickFalse; |
| break; |
| } |
| for (y=0; y < (ssize_t) width; y++) |
| { |
| register const Quantum |
| *restrict tile_pixels; |
| |
| register ssize_t |
| x; |
| |
| if (status == MagickFalse) |
| continue; |
| q=QueueCacheViewAuthenticPixels(rotate_view,(ssize_t) |
| (rotate_image->columns-(tile_y+height)),y+tile_x,height,1, |
| exception); |
| if (q == (Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| tile_pixels=p+((height-1)*width+y)*GetPixelChannels(image); |
| for (x=0; x < (ssize_t) height; x++) |
| { |
| register ssize_t |
| i; |
| |
| if (GetPixelMask(image,tile_pixels) != 0) |
| { |
| tile_pixels-=width*GetPixelChannels(image); |
| q+=GetPixelChannels(rotate_image); |
| continue; |
| } |
| for (i=0; i < (ssize_t) GetPixelChannels(image); i++) |
| { |
| PixelChannel |
| channel; |
| |
| PixelTrait |
| rotate_traits, |
| traits; |
| |
| channel=GetPixelChannelMapChannel(image,i); |
| traits=GetPixelChannelMapTraits(image,channel); |
| rotate_traits=GetPixelChannelMapTraits(rotate_image,channel); |
| if ((traits == UndefinedPixelTrait) || |
| (rotate_traits == UndefinedPixelTrait)) |
| continue; |
| SetPixelChannel(rotate_image,channel,tile_pixels[i],q); |
| } |
| tile_pixels-=width*GetPixelChannels(image); |
| q+=GetPixelChannels(rotate_image); |
| } |
| sync=SyncCacheViewAuthenticPixels(rotate_view,exception); |
| if (sync == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_IntegralRotateImage) |
| #endif |
| proceed=SetImageProgress(image,RotateImageTag,progress+=tile_height, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| (void) SetImageProgress(image,RotateImageTag,(MagickOffsetType) |
| image->rows-1,image->rows); |
| Swap(page.width,page.height); |
| Swap(page.x,page.y); |
| if (page.width != 0) |
| page.x=(ssize_t) (page.width-rotate_image->columns-page.x); |
| break; |
| } |
| case 2: |
| { |
| /* |
| Rotate 180 degrees. |
| */ |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static) shared(progress,status) \ |
| dynamic_number_threads(image,image->columns,image->rows,1) |
| #endif |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| MagickBooleanType |
| sync; |
| |
| register const Quantum |
| *restrict p; |
| |
| register Quantum |
| *restrict q; |
| |
| register ssize_t |
| x; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); |
| q=QueueCacheViewAuthenticPixels(rotate_view,0,(ssize_t) (image->rows-y- |
| 1),image->columns,1,exception); |
| if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL)) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| q+=GetPixelChannels(rotate_image)*image->columns; |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| register ssize_t |
| i; |
| |
| q-=GetPixelChannels(rotate_image); |
| if (GetPixelMask(image,p) != 0) |
| { |
| p+=GetPixelChannels(image); |
| continue; |
| } |
| for (i=0; i < (ssize_t) GetPixelChannels(image); i++) |
| { |
| PixelChannel |
| channel; |
| |
| PixelTrait |
| rotate_traits, |
| traits; |
| |
| channel=GetPixelChannelMapChannel(image,i); |
| traits=GetPixelChannelMapTraits(image,channel); |
| rotate_traits=GetPixelChannelMapTraits(rotate_image,channel); |
| if ((traits == UndefinedPixelTrait) || |
| (rotate_traits == UndefinedPixelTrait)) |
| continue; |
| SetPixelChannel(rotate_image,channel,p[i],q); |
| } |
| p+=GetPixelChannels(image); |
| } |
| sync=SyncCacheViewAuthenticPixels(rotate_view,exception); |
| if (sync == MagickFalse) |
| status=MagickFalse; |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_IntegralRotateImage) |
| #endif |
| proceed=SetImageProgress(image,RotateImageTag,progress++, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| (void) SetImageProgress(image,RotateImageTag,(MagickOffsetType) |
| image->rows-1,image->rows); |
| Swap(page.width,page.height); |
| Swap(page.x,page.y); |
| if (page.width != 0) |
| page.x=(ssize_t) (page.width-rotate_image->columns-page.x); |
| break; |
| } |
| case 3: |
| { |
| size_t |
| tile_height, |
| tile_width; |
| |
| ssize_t |
| tile_y; |
| |
| /* |
| Rotate 270 degrees. |
| */ |
| GetPixelCacheTileSize(image,&tile_width,&tile_height); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(progress,status) \ |
| dynamic_number_threads(image,image->columns,image->rows,1) |
| #endif |
| for (tile_y=0; tile_y < (ssize_t) image->rows; tile_y+=(ssize_t) tile_height) |
| { |
| register ssize_t |
| tile_x; |
| |
| if (status == MagickFalse) |
| continue; |
| tile_x=0; |
| for ( ; tile_x < (ssize_t) image->columns; tile_x+=(ssize_t) tile_width) |
| { |
| MagickBooleanType |
| sync; |
| |
| register const Quantum |
| *restrict p; |
| |
| register Quantum |
| *restrict q; |
| |
| register ssize_t |
| y; |
| |
| size_t |
| height, |
| width; |
| |
| width=tile_width; |
| if ((tile_x+(ssize_t) tile_width) > (ssize_t) image->columns) |
| width=(size_t) (tile_width-(tile_x+tile_width-image->columns)); |
| height=tile_height; |
| if ((tile_y+(ssize_t) tile_height) > (ssize_t) image->rows) |
| height=(size_t) (tile_height-(tile_y+tile_height-image->rows)); |
| p=GetCacheViewVirtualPixels(image_view,tile_x,tile_y,width,height, |
| exception); |
| if (p == (const Quantum *) NULL) |
| { |
| status=MagickFalse; |
| break; |
| } |
| for (y=0; y < (ssize_t) width; y++) |
| { |
| register const Quantum |
| *restrict tile_pixels; |
| |
| register ssize_t |
| x; |
| |
| if (status == MagickFalse) |
| continue; |
| q=QueueCacheViewAuthenticPixels(rotate_view,tile_y,(ssize_t) (y+ |
| rotate_image->rows-(tile_x+width)),height,1,exception); |
| if (q == (Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| tile_pixels=p+((width-1)-y)*GetPixelChannels(image); |
| for (x=0; x < (ssize_t) height; x++) |
| { |
| register ssize_t |
| i; |
| |
| if (GetPixelMask(image,tile_pixels) != 0) |
| { |
| tile_pixels+=width*GetPixelChannels(image); |
| q+=GetPixelChannels(rotate_image); |
| continue; |
| } |
| for (i=0; i < (ssize_t) GetPixelChannels(image); i++) |
| { |
| PixelChannel |
| channel; |
| |
| PixelTrait |
| rotate_traits, |
| traits; |
| |
| channel=GetPixelChannelMapChannel(image,i); |
| traits=GetPixelChannelMapTraits(image,channel); |
| rotate_traits=GetPixelChannelMapTraits(rotate_image,channel); |
| if ((traits == UndefinedPixelTrait) || |
| (rotate_traits == UndefinedPixelTrait)) |
| continue; |
| SetPixelChannel(rotate_image,channel,tile_pixels[i],q); |
| } |
| tile_pixels+=width*GetPixelChannels(image); |
| q+=GetPixelChannels(rotate_image); |
| } |
| sync=SyncCacheViewAuthenticPixels(rotate_view,exception); |
| if (sync == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| if (image->progress_monitor != (MagickProgressMonitor) NULL) |
| { |
| MagickBooleanType |
| proceed; |
| |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp critical (MagickCore_IntegralRotateImage) |
| #endif |
| proceed=SetImageProgress(image,RotateImageTag,progress+=tile_height, |
| image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| (void) SetImageProgress(image,RotateImageTag,(MagickOffsetType) |
| image->rows-1,image->rows); |
| Swap(page.width,page.height); |
| Swap(page.x,page.y); |
| if (page.width != 0) |
| page.x=(ssize_t) (page.width-rotate_image->columns-page.x); |
| break; |
| } |
| } |
| rotate_view=DestroyCacheView(rotate_view); |
| image_view=DestroyCacheView(image_view); |
| rotate_image->type=image->type; |
| rotate_image->page=page; |
| if (status == MagickFalse) |
| rotate_image=DestroyImage(rotate_image); |
| return(rotate_image); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| + X S h e a r I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % XShearImage() shears the image in the X direction with a shear angle of |
| % 'degrees'. Positive angles shear counter-clockwise (right-hand rule), and |
| % negative angles shear clockwise. Angles are measured relative to a vertical |
| % Y-axis. X shears will widen an image creating 'empty' triangles on the left |
| % and right sides of the source image. |
| % |
| % The format of the XShearImage method is: |
| % |
| % MagickBooleanType XShearImage(Image *image,const MagickRealType degrees, |
| % const size_t width,const size_t height, |
| % const ssize_t x_offset,const ssize_t y_offset,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o degrees: A MagickRealType representing the shearing angle along the X |
| % axis. |
| % |
| % o width, height, x_offset, y_offset: Defines a region of the image |
| % to shear. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| static MagickBooleanType XShearImage(Image *image,const MagickRealType degrees, |
| const size_t width,const size_t height,const ssize_t x_offset, |
| const ssize_t y_offset,ExceptionInfo *exception) |
| { |
| #define XShearImageTag "XShear/Image" |
| |
| typedef enum |
| { |
| LEFT, |
| RIGHT |
| } ShearDirection; |
| |
| CacheView |
| *image_view; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| PixelInfo |
| background; |
| |
| ssize_t |
| y; |
| |
| /* |
| X shear image. |
| */ |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| status=MagickTrue; |
| background=image->background_color; |
| progress=0; |
| image_view=AcquireAuthenticCacheView(image,exception); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(progress,status) \ |
| dynamic_number_threads(image,width,height,1) |
| #endif |
| for (y=0; y < (ssize_t) height; y++) |
| { |
| PixelInfo |
| pixel, |
| source, |
| destination; |
| |
| MagickRealType |
| area, |
| displacement; |
| |
| register Quantum |
| *restrict p, |
| *restrict q; |
| |
| register ssize_t |
| i; |
| |
| ShearDirection |
| direction; |
| |
| ssize_t |
| step; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewAuthenticPixels(image_view,0,y_offset+y,image->columns,1, |
| exception); |
| if (p == (Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| p+=x_offset*GetPixelChannels(image); |
| displacement=degrees*(MagickRealType) (y-height/2.0); |
| if (displacement == 0.0) |
| continue; |
| if (displacement > 0.0) |
| direction=RIGHT; |
| else |
| { |
| displacement*=(-1.0); |
| direction=LEFT; |
| } |
| step=(ssize_t) floor((double) displacement); |
| area=(MagickRealType) (displacement-step); |
| step++; |
| pixel=background; |
| GetPixelInfo(image,&source); |
| GetPixelInfo(image,&destination); |
| switch (direction) |
| { |
| case LEFT: |
| { |
| /* |
| Transfer pixels left-to-right. |
| */ |
| if (step > x_offset) |
| break; |
| q=p-step*GetPixelChannels(image); |
| for (i=0; i < (ssize_t) width; i++) |
| { |
| if ((x_offset+i) < step) |
| { |
| p+=GetPixelChannels(image); |
| GetPixelInfoPixel(image,p,&pixel); |
| q+=GetPixelChannels(image); |
| continue; |
| } |
| GetPixelInfoPixel(image,p,&source); |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &source,(MagickRealType) GetPixelAlpha(image,p),area,&destination); |
| SetPixelInfoPixel(image,&destination,q); |
| GetPixelInfoPixel(image,p,&pixel); |
| p+=GetPixelChannels(image); |
| q+=GetPixelChannels(image); |
| } |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &background,(MagickRealType) background.alpha,area,&destination); |
| SetPixelInfoPixel(image,&destination,q); |
| q+=GetPixelChannels(image); |
| for (i=0; i < (step-1); i++) |
| { |
| SetPixelInfoPixel(image,&background,q); |
| q+=GetPixelChannels(image); |
| } |
| break; |
| } |
| case RIGHT: |
| { |
| /* |
| Transfer pixels right-to-left. |
| */ |
| p+=width*GetPixelChannels(image); |
| q=p+step*GetPixelChannels(image); |
| for (i=0; i < (ssize_t) width; i++) |
| { |
| p-=GetPixelChannels(image); |
| q-=GetPixelChannels(image); |
| if ((size_t) (x_offset+width+step-i) >= image->columns) |
| continue; |
| GetPixelInfoPixel(image,p,&source); |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &source,(MagickRealType) GetPixelAlpha(image,p),area,&destination); |
| SetPixelInfoPixel(image,&destination,q); |
| GetPixelInfoPixel(image,p,&pixel); |
| } |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &background,(MagickRealType) background.alpha,area,&destination); |
| q-=GetPixelChannels(image); |
| SetPixelInfoPixel(image,&destination,q); |
| for (i=0; i < (step-1); i++) |
| { |
| q-=GetPixelChannels(image); |
| SetPixelInfoPixel(image,&background,q); |
| } |
| break; |
| } |
| } |
| 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_XShearImage) |
| #endif |
| proceed=SetImageProgress(image,XShearImageTag,progress++,height); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| + Y S h e a r I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % YShearImage shears the image in the Y direction with a shear angle of |
| % 'degrees'. Positive angles shear counter-clockwise (right-hand rule), and |
| % negative angles shear clockwise. Angles are measured relative to a |
| % horizontal X-axis. Y shears will increase the height of an image creating |
| % 'empty' triangles on the top and bottom of the source image. |
| % |
| % The format of the YShearImage method is: |
| % |
| % MagickBooleanType YShearImage(Image *image,const MagickRealType degrees, |
| % const size_t width,const size_t height, |
| % const ssize_t x_offset,const ssize_t y_offset,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o degrees: A MagickRealType representing the shearing angle along the Y |
| % axis. |
| % |
| % o width, height, x_offset, y_offset: Defines a region of the image |
| % to shear. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| static MagickBooleanType YShearImage(Image *image,const MagickRealType degrees, |
| const size_t width,const size_t height,const ssize_t x_offset, |
| const ssize_t y_offset,ExceptionInfo *exception) |
| { |
| #define YShearImageTag "YShear/Image" |
| |
| typedef enum |
| { |
| UP, |
| DOWN |
| } ShearDirection; |
| |
| CacheView |
| *image_view; |
| |
| MagickBooleanType |
| status; |
| |
| MagickOffsetType |
| progress; |
| |
| PixelInfo |
| background; |
| |
| ssize_t |
| x; |
| |
| /* |
| Y Shear image. |
| */ |
| assert(image != (Image *) NULL); |
| assert(image->signature == MagickSignature); |
| if (image->debug != MagickFalse) |
| (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
| status=MagickTrue; |
| progress=0; |
| background=image->background_color; |
| image_view=AcquireAuthenticCacheView(image,exception); |
| #if defined(MAGICKCORE_OPENMP_SUPPORT) |
| #pragma omp parallel for schedule(static,4) shared(progress,status) \ |
| dynamic_number_threads(image,width,height,1) |
| #endif |
| for (x=0; x < (ssize_t) width; x++) |
| { |
| ssize_t |
| step; |
| |
| MagickRealType |
| area, |
| displacement; |
| |
| PixelInfo |
| pixel, |
| source, |
| destination; |
| |
| register Quantum |
| *restrict p, |
| *restrict q; |
| |
| register ssize_t |
| i; |
| |
| ShearDirection |
| direction; |
| |
| if (status == MagickFalse) |
| continue; |
| p=GetCacheViewAuthenticPixels(image_view,x_offset+x,0,1,image->rows, |
| exception); |
| if (p == (Quantum *) NULL) |
| { |
| status=MagickFalse; |
| continue; |
| } |
| p+=y_offset*GetPixelChannels(image); |
| displacement=degrees*(MagickRealType) (x-width/2.0); |
| if (displacement == 0.0) |
| continue; |
| if (displacement > 0.0) |
| direction=DOWN; |
| else |
| { |
| displacement*=(-1.0); |
| direction=UP; |
| } |
| step=(ssize_t) floor((double) displacement); |
| area=(MagickRealType) (displacement-step); |
| step++; |
| pixel=background; |
| GetPixelInfo(image,&source); |
| GetPixelInfo(image,&destination); |
| switch (direction) |
| { |
| case UP: |
| { |
| /* |
| Transfer pixels top-to-bottom. |
| */ |
| if (step > y_offset) |
| break; |
| q=p-step*GetPixelChannels(image); |
| for (i=0; i < (ssize_t) height; i++) |
| { |
| if ((y_offset+i) < step) |
| { |
| p+=GetPixelChannels(image); |
| GetPixelInfoPixel(image,p,&pixel); |
| q+=GetPixelChannels(image); |
| continue; |
| } |
| GetPixelInfoPixel(image,p,&source); |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &source,(MagickRealType) GetPixelAlpha(image,p),area, |
| &destination); |
| SetPixelInfoPixel(image,&destination,q); |
| GetPixelInfoPixel(image,p,&pixel); |
| p+=GetPixelChannels(image); |
| q+=GetPixelChannels(image); |
| } |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &background,(MagickRealType) background.alpha,area,&destination); |
| SetPixelInfoPixel(image,&destination,q); |
| q+=GetPixelChannels(image); |
| for (i=0; i < (step-1); i++) |
| { |
| SetPixelInfoPixel(image,&background,q); |
| q+=GetPixelChannels(image); |
| } |
| break; |
| } |
| case DOWN: |
| { |
| /* |
| Transfer pixels bottom-to-top. |
| */ |
| p+=height*GetPixelChannels(image); |
| q=p+step*GetPixelChannels(image); |
| for (i=0; i < (ssize_t) height; i++) |
| { |
| p-=GetPixelChannels(image); |
| q-=GetPixelChannels(image); |
| if ((size_t) (y_offset+height+step-i) >= image->rows) |
| continue; |
| GetPixelInfoPixel(image,p,&source); |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &source,(MagickRealType) GetPixelAlpha(image,p),area, |
| &destination); |
| SetPixelInfoPixel(image,&destination,q); |
| GetPixelInfoPixel(image,p,&pixel); |
| } |
| CompositePixelInfoAreaBlend(&pixel,(MagickRealType) pixel.alpha, |
| &background,(MagickRealType) background.alpha,area,&destination); |
| q-=GetPixelChannels(image); |
| SetPixelInfoPixel(image,&destination,q); |
| for (i=0; i < (step-1); i++) |
| { |
| q-=GetPixelChannels(image); |
| SetPixelInfoPixel(image,&background,q); |
| } |
| break; |
| } |
| } |
| 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_YShearImage) |
| #endif |
| proceed=SetImageProgress(image,YShearImageTag,progress++,image->rows); |
| if (proceed == MagickFalse) |
| status=MagickFalse; |
| } |
| } |
| image_view=DestroyCacheView(image_view); |
| return(status); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % S h e a r I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ShearImage() creates a new image that is a shear_image copy of an existing |
| % one. Shearing slides one edge of an image along the X or Y axis, creating |
| % a parallelogram. An X direction shear slides an edge along the X axis, |
| % while a Y direction shear slides an edge along the Y axis. The amount of |
| % the shear is controlled by a shear angle. For X direction shears, x_shear |
| % is measured relative to the Y axis, and similarly, for Y direction shears |
| % y_shear is measured relative to the X axis. Empty triangles left over from |
| % shearing the image are filled with the background color defined by member |
| % 'background_color' of the image.. ShearImage() allocates the memory |
| % necessary for the new Image structure and returns a pointer to the new image. |
| % |
| % ShearImage() is based on the paper "A Fast Algorithm for General Raster |
| % Rotatation" by Alan W. Paeth. |
| % |
| % The format of the ShearImage method is: |
| % |
| % Image *ShearImage(const Image *image,const double x_shear, |
| % const double y_shear,ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o x_shear, y_shear: Specifies the number of degrees to shear the image. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport Image *ShearImage(const Image *image,const double x_shear, |
| const double y_shear,ExceptionInfo *exception) |
| { |
| Image |
| *integral_image, |
| *shear_image; |
| |
| ssize_t |
| x_offset, |
| y_offset; |
| |
| MagickBooleanType |
| status; |
| |
| PointInfo |
| shear; |
| |
| RectangleInfo |
| border_info; |
| |
| size_t |
| y_width; |
| |
| 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 ((x_shear != 0.0) && (fmod(x_shear,90.0) == 0.0)) |
| ThrowImageException(ImageError,"AngleIsDiscontinuous"); |
| if ((y_shear != 0.0) && (fmod(y_shear,90.0) == 0.0)) |
| ThrowImageException(ImageError,"AngleIsDiscontinuous"); |
| /* |
| Initialize shear angle. |
| */ |
| integral_image=CloneImage(image,0,0,MagickTrue,exception); |
| if (integral_image == (Image *) NULL) |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| shear.x=(-tan(DegreesToRadians(fmod(x_shear,360.0)))); |
| shear.y=tan(DegreesToRadians(fmod(y_shear,360.0))); |
| if ((shear.x == 0.0) && (shear.y == 0.0)) |
| return(integral_image); |
| if (SetImageStorageClass(integral_image,DirectClass,exception) == MagickFalse) |
| { |
| integral_image=DestroyImage(integral_image); |
| return(integral_image); |
| } |
| if (integral_image->matte == MagickFalse) |
| (void) SetImageAlphaChannel(integral_image,OpaqueAlphaChannel,exception); |
| /* |
| Compute image size. |
| */ |
| y_width=image->columns+(ssize_t) floor(fabs(shear.x)*image->rows+0.5); |
| x_offset=(ssize_t) ceil((double) image->columns+((fabs(shear.x)*image->rows)- |
| image->columns)/2.0-0.5); |
| y_offset=(ssize_t) ceil((double) image->rows+((fabs(shear.y)*y_width)- |
| image->rows)/2.0-0.5); |
| /* |
| Surround image with border. |
| */ |
| integral_image->border_color=integral_image->background_color; |
| integral_image->compose=CopyCompositeOp; |
| border_info.width=(size_t) x_offset; |
| border_info.height=(size_t) y_offset; |
| shear_image=BorderImage(integral_image,&border_info,image->compose,exception); |
| integral_image=DestroyImage(integral_image); |
| if (shear_image == (Image *) NULL) |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| /* |
| Shear the image. |
| */ |
| if (shear_image->matte == MagickFalse) |
| (void) SetImageAlphaChannel(shear_image,OpaqueAlphaChannel,exception); |
| status=XShearImage(shear_image,shear.x,image->columns,image->rows,x_offset, |
| (ssize_t) (shear_image->rows-image->rows)/2,exception); |
| if (status == MagickFalse) |
| { |
| shear_image=DestroyImage(shear_image); |
| return((Image *) NULL); |
| } |
| status=YShearImage(shear_image,shear.y,y_width,image->rows,(ssize_t) |
| (shear_image->columns-y_width)/2,y_offset,exception); |
| if (status == MagickFalse) |
| { |
| shear_image=DestroyImage(shear_image); |
| return((Image *) NULL); |
| } |
| status=CropToFitImage(&shear_image,shear.x,shear.y,(MagickRealType) |
| image->columns,(MagickRealType) image->rows,MagickFalse,exception); |
| if (status == MagickFalse) |
| { |
| shear_image=DestroyImage(shear_image); |
| return((Image *) NULL); |
| } |
| shear_image->compose=image->compose; |
| shear_image->page.width=0; |
| shear_image->page.height=0; |
| return(shear_image); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % S h e a r R o t a t e I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ShearRotateImage() creates a new image that is a rotated copy of an existing |
| % one. Positive angles rotate counter-clockwise (right-hand rule), while |
| % negative angles rotate clockwise. Rotated images are usually larger than |
| % the originals and have 'empty' triangular corners. X axis. Empty |
| % triangles left over from shearing the image are filled with the background |
| % color defined by member 'background_color' of the image. ShearRotateImage |
| % allocates the memory necessary for the new Image structure and returns a |
| % pointer to the new image. |
| % |
| % ShearRotateImage() is based on the paper "A Fast Algorithm for General |
| % Raster Rotatation" by Alan W. Paeth. ShearRotateImage is adapted from a |
| % similar method based on the Paeth paper written by Michael Halle of the |
| % Spatial Imaging Group, MIT Media Lab. |
| % |
| % The format of the ShearRotateImage method is: |
| % |
| % Image *ShearRotateImage(const Image *image,const double degrees, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows. |
| % |
| % o image: the image. |
| % |
| % o degrees: Specifies the number of degrees to rotate the image. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| MagickExport Image *ShearRotateImage(const Image *image,const double degrees, |
| ExceptionInfo *exception) |
| { |
| Image |
| *integral_image, |
| *rotate_image; |
| |
| MagickBooleanType |
| status; |
| |
| MagickRealType |
| angle; |
| |
| PointInfo |
| shear; |
| |
| RectangleInfo |
| border_info; |
| |
| size_t |
| height, |
| rotations, |
| width, |
| y_width; |
| |
| ssize_t |
| x_offset, |
| y_offset; |
| |
| /* |
| Adjust rotation angle. |
| */ |
| 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); |
| angle=degrees; |
| while (angle < -45.0) |
| angle+=360.0; |
| for (rotations=0; angle > 45.0; rotations++) |
| angle-=90.0; |
| rotations%=4; |
| /* |
| Calculate shear equations. |
| */ |
| integral_image=IntegralRotateImage(image,rotations,exception); |
| if (integral_image == (Image *) NULL) |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| shear.x=(-tan((double) DegreesToRadians(angle)/2.0)); |
| shear.y=sin((double) DegreesToRadians(angle)); |
| if ((shear.x == 0.0) && (shear.y == 0.0)) |
| return(integral_image); |
| if (SetImageStorageClass(integral_image,DirectClass,exception) == MagickFalse) |
| { |
| integral_image=DestroyImage(integral_image); |
| return(integral_image); |
| } |
| if (integral_image->matte == MagickFalse) |
| (void) SetImageAlphaChannel(integral_image,OpaqueAlphaChannel,exception); |
| /* |
| Compute image size. |
| */ |
| width=image->columns; |
| height=image->rows; |
| if ((rotations == 1) || (rotations == 3)) |
| { |
| width=image->rows; |
| height=image->columns; |
| } |
| y_width=width+(ssize_t) floor(fabs(shear.x)*height+0.5); |
| x_offset=(ssize_t) ceil((double) width+((fabs(shear.y)*height)-width)/2.0- |
| 0.5); |
| y_offset=(ssize_t) ceil((double) height+((fabs(shear.y)*y_width)-height)/2.0- |
| 0.5); |
| /* |
| Surround image with a border. |
| */ |
| integral_image->border_color=integral_image->background_color; |
| integral_image->compose=CopyCompositeOp; |
| border_info.width=(size_t) x_offset; |
| border_info.height=(size_t) y_offset; |
| rotate_image=BorderImage(integral_image,&border_info,image->compose, |
| exception); |
| integral_image=DestroyImage(integral_image); |
| if (rotate_image == (Image *) NULL) |
| ThrowImageException(ResourceLimitError,"MemoryAllocationFailed"); |
| /* |
| Rotate the image. |
| */ |
| status=XShearImage(rotate_image,shear.x,width,height,x_offset,(ssize_t) |
| (rotate_image->rows-height)/2,exception); |
| if (status == MagickFalse) |
| { |
| rotate_image=DestroyImage(rotate_image); |
| return((Image *) NULL); |
| } |
| status=YShearImage(rotate_image,shear.y,y_width,height,(ssize_t) |
| (rotate_image->columns-y_width)/2,y_offset,exception); |
| if (status == MagickFalse) |
| { |
| rotate_image=DestroyImage(rotate_image); |
| return((Image *) NULL); |
| } |
| status=XShearImage(rotate_image,shear.x,y_width,rotate_image->rows,(ssize_t) |
| (rotate_image->columns-y_width)/2,0,exception); |
| if (status == MagickFalse) |
| { |
| rotate_image=DestroyImage(rotate_image); |
| return((Image *) NULL); |
| } |
| status=CropToFitImage(&rotate_image,shear.x,shear.y,(MagickRealType) width, |
| (MagickRealType) height,MagickTrue,exception); |
| if (status == MagickFalse) |
| { |
| rotate_image=DestroyImage(rotate_image); |
| return((Image *) NULL); |
| } |
| rotate_image->compose=image->compose; |
| rotate_image->page.width=0; |
| rotate_image->page.height=0; |
| return(rotate_image); |
| } |