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/* |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% % |
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% % |
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% % |
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% SSSSS H H EEEEE AAA RRRR % |
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% SS H H E A A R R % |
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% SSS HHHHH EEE AAAAA RRRR % |
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% SS H H E A A R R % |
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% SSSSS H H EEEEE A A R R % |
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% % |
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% % |
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% MagickCore Methods to Shear or Rotate an Image by an Arbitrary Angle % |
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% % |
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% Software Design % |
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% Cristy % |
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% July 1992 % |
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% % |
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% % |
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% Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization % |
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% dedicated to making software imaging solutions freely available. % |
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% % |
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% You may not use this file except in compliance with the License. You may % |
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% obtain a copy of the License at % |
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% % |
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% http://www.imagemagick.org/script/license.php % |
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% % |
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% Unless required by applicable law or agreed to in writing, software % |
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% distributed under the License is distributed on an "AS IS" BASIS, % |
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % |
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% See the License for the specific language governing permissions and % |
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% limitations under the License. % |
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% % |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% |
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% The XShearImage() and YShearImage() methods are based on the paper "A Fast |
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% Algorithm for General Raster Rotatation" by Alan W. Paeth, Graphics |
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% Interface '86 (Vancouver). ShearRotateImage() is adapted from a similar |
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% method based on the Paeth paper written by Michael Halle of the Spatial |
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% Imaging Group, MIT Media Lab. |
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% |
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*/ |
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/* |
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Include declarations. |
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*/ |
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#include "MagickCore/studio.h" |
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#include "MagickCore/artifact.h" |
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#include "MagickCore/attribute.h" |
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#include "MagickCore/blob-private.h" |
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#include "MagickCore/cache-private.h" |
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#include "MagickCore/channel.h" |
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#include "MagickCore/color-private.h" |
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#include "MagickCore/colorspace-private.h" |
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#include "MagickCore/composite.h" |
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#include "MagickCore/composite-private.h" |
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#include "MagickCore/decorate.h" |
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#include "MagickCore/distort.h" |
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#include "MagickCore/draw.h" |
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#include "MagickCore/exception.h" |
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#include "MagickCore/exception-private.h" |
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#include "MagickCore/gem.h" |
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#include "MagickCore/geometry.h" |
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#include "MagickCore/image.h" |
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#include "MagickCore/image-private.h" |
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#include "MagickCore/matrix.h" |
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#include "MagickCore/memory_.h" |
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#include "MagickCore/list.h" |
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#include "MagickCore/monitor.h" |
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#include "MagickCore/monitor-private.h" |
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#include "MagickCore/nt-base-private.h" |
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#include "MagickCore/pixel-accessor.h" |
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#include "MagickCore/quantum.h" |
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#include "MagickCore/resource_.h" |
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#include "MagickCore/shear.h" |
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#include "MagickCore/statistic.h" |
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#include "MagickCore/string_.h" |
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#include "MagickCore/string-private.h" |
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#include "MagickCore/thread-private.h" |
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#include "MagickCore/threshold.h" |
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#include "MagickCore/transform.h" |
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/* |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% % |
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% % |
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% % |
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+ C r o p T o F i t I m a g e % |
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% % |
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% % |
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% % |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% |
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% CropToFitImage() crops the sheared image as determined by the bounding box |
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% as defined by width and height and shearing angles. |
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% |
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% The format of the CropToFitImage method is: |
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% |
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% MagickBooleanType CropToFitImage(Image **image, |
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% const double x_shear,const double x_shear, |
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% const double width,const double height, |
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% const MagickBooleanType rotate,ExceptionInfo *exception) |
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% |
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% A description of each parameter follows. |
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% |
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% o image: the image. |
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% |
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% o x_shear, y_shear, width, height: Defines a region of the image to crop. |
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% |
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% o exception: return any errors or warnings in this structure. |
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% |
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*/ |
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static MagickBooleanType CropToFitImage(Image **image, |
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const double x_shear,const double y_shear, |
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const double width,const double height, |
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const MagickBooleanType rotate,ExceptionInfo *exception) |
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{ |
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Image |
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*crop_image; |
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PointInfo |
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extent[4], |
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min, |
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max; |
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RectangleInfo |
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geometry, |
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page; |
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register ssize_t |
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i; |
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/* |
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Calculate the rotated image size. |
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*/ |
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extent[0].x=(double) (-width/2.0); |
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extent[0].y=(double) (-height/2.0); |
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extent[1].x=(double) width/2.0; |
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extent[1].y=(double) (-height/2.0); |
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extent[2].x=(double) (-width/2.0); |
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extent[2].y=(double) height/2.0; |
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extent[3].x=(double) width/2.0; |
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extent[3].y=(double) height/2.0; |
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for (i=0; i < 4; i++) |
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{ |
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extent[i].x+=x_shear*extent[i].y; |
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extent[i].y+=y_shear*extent[i].x; |
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if (rotate != MagickFalse) |
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extent[i].x+=x_shear*extent[i].y; |
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extent[i].x+=(double) (*image)->columns/2.0; |
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extent[i].y+=(double) (*image)->rows/2.0; |
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} |
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min=extent[0]; |
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max=extent[0]; |
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for (i=1; i < 4; i++) |
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{ |
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if (min.x > extent[i].x) |
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min.x=extent[i].x; |
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if (min.y > extent[i].y) |
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min.y=extent[i].y; |
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if (max.x < extent[i].x) |
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max.x=extent[i].x; |
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if (max.y < extent[i].y) |
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max.y=extent[i].y; |
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} |
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geometry.x=(ssize_t) ceil(min.x-0.5); |
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geometry.y=(ssize_t) ceil(min.y-0.5); |
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geometry.width=(size_t) floor(max.x-min.x+0.5); |
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geometry.height=(size_t) floor(max.y-min.y+0.5); |
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page=(*image)->page; |
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(void) ParseAbsoluteGeometry("0x0+0+0",&(*image)->page); |
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crop_image=CropImage(*image,&geometry,exception); |
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if (crop_image == (Image *) NULL) |
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return(MagickFalse); |
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crop_image->page=page; |
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*image=DestroyImage(*image); |
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*image=crop_image; |
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return(MagickTrue); |
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} |
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/* |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% % |
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% % |
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% % |
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% D e s k e w I m a g e % |
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% % |
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% % |
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% % |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% |
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% DeskewImage() removes skew from the image. Skew is an artifact that |
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% occurs in scanned images because of the camera being misaligned, |
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% imperfections in the scanning or surface, or simply because the paper was |
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% not placed completely flat when scanned. |
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% |
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% The result will be auto-croped if the artifact "deskew:auto-crop" is |
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% defined, while the amount the image is to be deskewed, in degrees is also |
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% saved as the artifact "deskew:angle". |
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% |
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% If the artifact "deskew:auto-crop" is given the image will be automatically |
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% cropped of the excess background. The value is the border width of all |
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% pixels around the edge that will be used to determine an average border |
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% color for the automatic trim. |
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% |
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% The format of the DeskewImage method is: |
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% |
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% Image *DeskewImage(const Image *image,const double threshold, |
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% ExceptionInfo *exception) |
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% |
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% A description of each parameter follows: |
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% |
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% o image: the image. |
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% |
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% o threshold: separate background from foreground. |
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% |
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% o exception: return any errors or warnings in this structure. |
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% |
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*/ |
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static void RadonProjection(const Image *image,MatrixInfo *source_matrixs, |
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MatrixInfo *destination_matrixs,const ssize_t sign,size_t *projection) |
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{ |
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MatrixInfo |
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*swap; |
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register MatrixInfo |
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*p, |
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*q; |
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register ssize_t |
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x; |
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size_t |
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step; |
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p=source_matrixs; |
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q=destination_matrixs; |
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for (step=1; step < GetMatrixColumns(p); step*=2) |
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{ |
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for (x=0; x < (ssize_t) GetMatrixColumns(p); x+=2*(ssize_t) step) |
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{ |
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register ssize_t |
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i; |
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ssize_t |
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y; |
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unsigned short |
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element, |
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neighbor; |
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for (i=0; i < (ssize_t) step; i++) |
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{ |
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for (y=0; y < (ssize_t) (GetMatrixRows(p)-i-1); y++) |
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{ |
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if (GetMatrixElement(p,x+i,y,&element) == MagickFalse) |
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continue; |
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if (GetMatrixElement(p,x+i+step,y+i,&neighbor) == MagickFalse) |
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continue; |
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neighbor+=element; |
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if (SetMatrixElement(q,x+2*i,y,&neighbor) == MagickFalse) |
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continue; |
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if (GetMatrixElement(p,x+i+step,y+i+1,&neighbor) == MagickFalse) |
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continue; |
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neighbor+=element; |
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if (SetMatrixElement(q,x+2*i+1,y,&neighbor) == MagickFalse) |
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continue; |
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} |
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for ( ; y < (ssize_t) (GetMatrixRows(p)-i); y++) |
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{ |
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if (GetMatrixElement(p,x+i,y,&element) == MagickFalse) |
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continue; |
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if (GetMatrixElement(p,x+i+step,y+i,&neighbor) == MagickFalse) |
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continue; |
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neighbor+=element; |
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if (SetMatrixElement(q,x+2*i,y,&neighbor) == MagickFalse) |
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continue; |
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if (SetMatrixElement(q,x+2*i+1,y,&element) == MagickFalse) |
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continue; |
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} |
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for ( ; y < (ssize_t) GetMatrixRows(p); y++) |
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{ |
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if (GetMatrixElement(p,x+i,y,&element) == MagickFalse) |
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continue; |
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if (SetMatrixElement(q,x+2*i,y,&element) == MagickFalse) |
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continue; |
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if (SetMatrixElement(q,x+2*i+1,y,&element) == MagickFalse) |
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continue; |
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} |
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} |
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} |
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swap=p; |
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p=q; |
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q=swap; |
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} |
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#if defined(MAGICKCORE_OPENMP_SUPPORT) |
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#pragma omp parallel for schedule(static,4) \ |
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magick_threads(image,image,1,1) |
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#endif |
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for (x=0; x < (ssize_t) GetMatrixColumns(p); x++) |
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{ |
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register ssize_t |
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y; |
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size_t |
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sum; |
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sum=0; |
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for (y=0; y < (ssize_t) (GetMatrixRows(p)-1); y++) |
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{ |
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ssize_t |
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delta; |
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unsigned short |
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element, |
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neighbor; |
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if (GetMatrixElement(p,x,y,&element) == MagickFalse) |
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continue; |
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if (GetMatrixElement(p,x,y+1,&neighbor) == MagickFalse) |
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continue; |
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delta=(ssize_t) element-(ssize_t) neighbor; |
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sum+=delta*delta; |
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} |
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projection[GetMatrixColumns(p)+sign*x-1]=sum; |
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} |
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} |
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static MagickBooleanType RadonTransform(const Image *image, |
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const double threshold,size_t *projection,ExceptionInfo *exception) |
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{ |
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CacheView |
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*image_view; |
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MatrixInfo |
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*destination_matrixs, |
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*source_matrixs; |
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MagickBooleanType |
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status; |
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size_t |
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count, |
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width; |
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ssize_t |
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j, |
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y; |
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unsigned char |
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c; |
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unsigned short |
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bits[256]; |
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for (width=1; width < ((image->columns+7)/8); width<<=1) ; |
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source_matrixs=AcquireMatrixInfo(width,image->rows,sizeof(unsigned short), |
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exception); |
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destination_matrixs=AcquireMatrixInfo(width,image->rows,sizeof(unsigned short), |
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exception); |
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if ((source_matrixs == (MatrixInfo *) NULL) || |
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(destination_matrixs == (MatrixInfo *) NULL)) |
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{ |
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if (destination_matrixs != (MatrixInfo *) NULL) |
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destination_matrixs=DestroyMatrixInfo(destination_matrixs); |
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if (source_matrixs != (MatrixInfo *) NULL) |
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source_matrixs=DestroyMatrixInfo(source_matrixs); |
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return(MagickFalse); |
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} |
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if (NullMatrix(source_matrixs) == MagickFalse) |
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{ |
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destination_matrixs=DestroyMatrixInfo(destination_matrixs); |
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source_matrixs=DestroyMatrixInfo(source_matrixs); |
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return(MagickFalse); |
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} |
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for (j=0; j < 256; j++) |
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{ |
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c=(unsigned char) j; |
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for (count=0; c != 0; c>>=1) |
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count+=c & 0x01; |
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bits[j]=(unsigned short) count; |
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} |
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status=MagickTrue; |
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image_view=AcquireVirtualCacheView(image,exception); |
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#if defined(MAGICKCORE_OPENMP_SUPPORT) |
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#pragma omp parallel for schedule(static,4) shared(status) \ |
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magick_threads(image,image,1,1) |
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#endif |
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for (y=0; y < (ssize_t) image->rows; y++) |
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{ |
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register const Quantum |
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*magick_restrict p; |
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|
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register ssize_t |
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|
i, |
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x; |
|
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|
|
|
size_t |
|
|
bit, |
|
|
byte; |
|
|
|
|
|
unsigned short |
|
|
value; |
|
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|
|
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if (status == MagickFalse) |
|
|
continue; |
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|
p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); |
|
|
if (p == (const Quantum *) NULL) |
|
|
{ |
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|
status=MagickFalse; |
|
|
continue; |
|
|
} |
|
|
bit=0; |
|
|
byte=0; |
|
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i=(ssize_t) (image->columns+7)/8; |
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for (x=0; x < (ssize_t) image->columns; x++) |
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|
{ |
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|
byte<<=1; |
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if (((MagickRealType) GetPixelRed(image,p) < threshold) || |
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|
((MagickRealType) GetPixelGreen(image,p) < threshold) || |
|
|
((MagickRealType) GetPixelBlue(image,p) < threshold)) |
|
|
byte|=0x01; |
|
|
bit++; |
|
|
if (bit == 8) |
|
|
{ |
|
|
value=bits[byte]; |
|
|
(void) SetMatrixElement(source_matrixs,--i,y,&value); |
|
|
bit=0; |
|
|
byte=0; |
|
|
} |
|
|
p+=GetPixelChannels(image); |
|
|
} |
|
|
if (bit != 0) |
|
|
{ |
|
|
byte<<=(8-bit); |
|
|
value=bits[byte]; |
|
|
(void) SetMatrixElement(source_matrixs,--i,y,&value); |
|
|
} |
|
|
} |
|
|
RadonProjection(image,source_matrixs,destination_matrixs,-1,projection); |
|
|
(void) NullMatrix(source_matrixs); |
|
|
#if defined(MAGICKCORE_OPENMP_SUPPORT) |
|
|
#pragma omp parallel for schedule(static,4) shared(status) \ |
|
|
magick_threads(image,image,image->rows,1) |
|
|
#endif |
|
|
for (y=0; y < (ssize_t) image->rows; y++) |
|
|
{ |
|
|
register const Quantum |
|
|
*magick_restrict p; |
|
|
|
|
|
register ssize_t |
|
|
i, |
|
|
x; |
|
|
|
|
|
size_t |
|
|
bit, |
|
|
byte; |
|
|
|
|
|
unsigned short |
|
|
value; |
|
|
|
|
|
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 (((MagickRealType) GetPixelRed(image,p) < threshold) || |
|
|
((MagickRealType) GetPixelGreen(image,p) < threshold) || |
|
|
((MagickRealType) GetPixelBlue(image,p) < threshold)) |
|
|
byte|=0x01; |
|
|
bit++; |
|
|
if (bit == 8) |
|
|
{ |
|
|
value=bits[byte]; |
|
|
(void) SetMatrixElement(source_matrixs,i++,y,&value); |
|
|
bit=0; |
|
|
byte=0; |
|
|
} |
|
|
p+=GetPixelChannels(image); |
|
|
} |
|
|
if (bit != 0) |
|
|
{ |
|
|
byte<<=(8-bit); |
|
|
value=bits[byte]; |
|
|
(void) SetMatrixElement(source_matrixs,i++,y,&value); |
|
|
} |
|
|
} |
|
|
RadonProjection(image,source_matrixs,destination_matrixs,1,projection); |
|
|
image_view=DestroyCacheView(image_view); |
|
|
destination_matrixs=DestroyMatrixInfo(destination_matrixs); |
|
|
source_matrixs=DestroyMatrixInfo(source_matrixs); |
|
|
return(MagickTrue); |
|
|
} |
|
|
|
|
|
static void GetImageBackgroundColor(Image *image,const ssize_t offset, |
|
|
ExceptionInfo *exception) |
|
|
{ |
|
|
CacheView |
|
|
*image_view; |
|
|
|
|
|
PixelInfo |
|
|
background; |
|
|
|
|
|
double |
|
|
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 |
|
|
*magick_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); |
|
|
degrees=RadiansToDegrees(-atan((double) skew/width/8)); |
|
|
if (image->debug != MagickFalse) |
|
|
(void) LogMagickEvent(TransformEvent,GetMagickModule(), |
|
|
" Deskew angle: %g",degrees); |
|
|
/* |
|
|
Deskew image. |
|
|
*/ |
|
|
clone_image=CloneImage(image,0,0,MagickTrue,exception); |
|
|
if (clone_image == (Image *) NULL) |
|
|
return((Image *) NULL); |
|
|
{ |
|
|
char |
|
|
angle[MagickPathExtent]; |
|
|
|
|
|
(void) FormatLocaleString(angle,MagickPathExtent,"%.20g",degrees); |
|
|
(void) SetImageArtifact(clone_image,"deskew:angle",angle); |
|
|
} |
|
|
(void) SetImageVirtualPixelMethod(clone_image,BackgroundVirtualPixelMethod, |
|
|
exception); |
|
|
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 (IsStringTrue(artifact) == MagickFalse) |
|
|
{ |
|
|
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; |
|
|
|
|
|
/* |
|
|
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 1: |
|
|
{ |
|
|
size_t |
|
|
tile_height, |
|
|
tile_width; |
|
|
|
|
|
ssize_t |
|
|
tile_y; |
|
|
|
|
|
/* |
|
|
Rotate 90 degrees. |
|
|
*/ |
|
|
GetPixelCacheTileSize(image,&tile_width,&tile_height); |
|
|
tile_width=image->columns; |
|
|
#if defined(MAGICKCORE_OPENMP_SUPPORT) |
|
|
#pragma omp parallel for schedule(static,4) shared(status) \ |
|
|
magick_threads(image,image,1,1) |
|
|
#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 |
|
|
*magick_restrict p; |
|
|
|
|
|
register Quantum |
|
|
*magick_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 |
|
|
*magick_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 (GetPixelReadMask(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=GetPixelChannelChannel(image,i); |
|
|
PixelTrait traits=GetPixelChannelTraits(image,channel); |
|
|
PixelTrait rotate_traits=GetPixelChannelTraits(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: |
|
|
{ |
|
|
register ssize_t |
|
|
y; |
|
|
|
|
|
/* |
|
|
Rotate 180 degrees. |
|
|
*/ |
|
|
#if defined(MAGICKCORE_OPENMP_SUPPORT) |
|
|
#pragma omp parallel for schedule(static,4) shared(status) \ |
|
|
magick_threads(image,image,1,1) |
|
|
#endif |
|
|
for (y=0; y < (ssize_t) image->rows; y++) |
|
|
{ |
|
|
MagickBooleanType |
|
|
sync; |
|
|
|
|
|
register const Quantum |
|
|
*magick_restrict p; |
|
|
|
|
|
register Quantum |
|
|
*magick_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 (GetPixelReadMask(image,p) == 0) |
|
|
{ |
|
|
p+=GetPixelChannels(image); |
|
|
continue; |
|
|
} |
|
|
for (i=0; i < (ssize_t) GetPixelChannels(image); i++) |
|
|
{ |
|
|
PixelChannel channel=GetPixelChannelChannel(image,i); |
|
|
PixelTrait traits=GetPixelChannelTraits(image,channel); |
|
|
PixelTrait rotate_traits=GetPixelChannelTraits(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); |
|
|
tile_width=image->columns; |
|
|
#if defined(MAGICKCORE_OPENMP_SUPPORT) |
|
|
#pragma omp parallel for schedule(static,4) shared(status) \ |
|
|
magick_threads(image,image,1,1) |
|
|
#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 |
|
|
*magick_restrict p; |
|
|
|
|
|
register Quantum |
|
|
*magick_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 |
|
|
*magick_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 (GetPixelReadMask(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=GetPixelChannelChannel(image,i); |
|
|
PixelTrait traits=GetPixelChannelTraits(image,channel); |
|
|
PixelTrait rotate_traits=GetPixelChannelTraits(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); |
|
|
} |
|
|
#if defined(MAGICKCORE_OPENMP_SUPPORT) |
|
|
#pragma omp critical (MagickCore_IntegralRotateImage) |
|
|
#endif |
|
|
sync=SyncCacheViewAuthenticPixels(rotate_view,exception); |
|
|
if (sync == MagickFalse) |
|
|
status=MagickFalse; |
|
|
} |
|
|
} |
|
|
if (image->progress_monitor != (MagickProgressMonitor) NULL) |
|
|
{ |
|
|
MagickBooleanType |
|
|
proceed; |
|
|
|
|
|
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; |
|
|
} |
|
|
default: |
|
|
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 double 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 double 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 double 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 == MagickCoreSignature); |
|
|
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) \ |
|
|
magick_threads(image,image,height,1) |
|
|
#endif |
|
|
for (y=0; y < (ssize_t) height; y++) |
|
|
{ |
|
|
PixelInfo |
|
|
pixel, |
|
|
source, |
|
|
destination; |
|
|
|
|
|
double |
|
|
area, |
|
|
displacement; |
|
|
|
|
|
register Quantum |
|
|
*magick_restrict p, |
|
|
*magick_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*(double) (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=(double) (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,(double) pixel.alpha, |
|
|
&source,(double) GetPixelAlpha(image,p),area,&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
GetPixelInfoPixel(image,p,&pixel); |
|
|
p+=GetPixelChannels(image); |
|
|
q+=GetPixelChannels(image); |
|
|
} |
|
|
CompositePixelInfoAreaBlend(&pixel,(double) pixel.alpha, |
|
|
&background,(double) background.alpha,area,&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
q+=GetPixelChannels(image); |
|
|
for (i=0; i < (step-1); i++) |
|
|
{ |
|
|
SetPixelViaPixelInfo(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,(double) pixel.alpha, |
|
|
&source,(double) GetPixelAlpha(image,p),area,&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
GetPixelInfoPixel(image,p,&pixel); |
|
|
} |
|
|
CompositePixelInfoAreaBlend(&pixel,(double) pixel.alpha, |
|
|
&background,(double) background.alpha,area,&destination); |
|
|
q-=GetPixelChannels(image); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
for (i=0; i < (step-1); i++) |
|
|
{ |
|
|
q-=GetPixelChannels(image); |
|
|
SetPixelViaPixelInfo(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 double 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 double 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 double 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 == MagickCoreSignature); |
|
|
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) \ |
|
|
magick_threads(image,image,width,1) |
|
|
#endif |
|
|
for (x=0; x < (ssize_t) width; x++) |
|
|
{ |
|
|
ssize_t |
|
|
step; |
|
|
|
|
|
double |
|
|
area, |
|
|
displacement; |
|
|
|
|
|
PixelInfo |
|
|
pixel, |
|
|
source, |
|
|
destination; |
|
|
|
|
|
register Quantum |
|
|
*magick_restrict p, |
|
|
*magick_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*(double) (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=(double) (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,(double) pixel.alpha, |
|
|
&source,(double) GetPixelAlpha(image,p),area, |
|
|
&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
GetPixelInfoPixel(image,p,&pixel); |
|
|
p+=GetPixelChannels(image); |
|
|
q+=GetPixelChannels(image); |
|
|
} |
|
|
CompositePixelInfoAreaBlend(&pixel,(double) pixel.alpha, |
|
|
&background,(double) background.alpha,area,&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
q+=GetPixelChannels(image); |
|
|
for (i=0; i < (step-1); i++) |
|
|
{ |
|
|
SetPixelViaPixelInfo(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,(double) pixel.alpha, |
|
|
&source,(double) GetPixelAlpha(image,p),area, |
|
|
&destination); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
GetPixelInfoPixel(image,p,&pixel); |
|
|
} |
|
|
CompositePixelInfoAreaBlend(&pixel,(double) pixel.alpha, |
|
|
&background,(double) background.alpha,area,&destination); |
|
|
q-=GetPixelChannels(image); |
|
|
SetPixelViaPixelInfo(image,&destination,q); |
|
|
for (i=0; i < (step-1); i++) |
|
|
{ |
|
|
q-=GetPixelChannels(image); |
|
|
SetPixelViaPixelInfo(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; |
|
|
|
|
|
MagickBooleanType |
|
|
status; |
|
|
|
|
|
PointInfo |
|
|
shear; |
|
|
|
|
|
RectangleInfo |
|
|
border_info, |
|
|
bounds; |
|
|
|
|
|
assert(image != (Image *) NULL); |
|
|
assert(image->signature == MagickCoreSignature); |
|
|
if (image->debug != MagickFalse) |
|
|
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
|
|
assert(exception != (ExceptionInfo *) NULL); |
|
|
assert(exception->signature == MagickCoreSignature); |
|
|
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->alpha_trait == UndefinedPixelTrait) |
|
|
(void) SetImageAlphaChannel(integral_image,OpaqueAlphaChannel,exception); |
|
|
/* |
|
|
Compute image size. |
|
|
*/ |
|
|
bounds.width=image->columns+(ssize_t) floor(fabs(shear.x)*image->rows+0.5); |
|
|
bounds.x=(ssize_t) ceil((double) image->columns+((fabs(shear.x)*image->rows)- |
|
|
image->columns)/2.0-0.5); |
|
|
bounds.y=(ssize_t) ceil((double) image->rows+((fabs(shear.y)*bounds.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) bounds.x; |
|
|
border_info.height=(size_t) bounds.y; |
|
|
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->alpha_trait == UndefinedPixelTrait) |
|
|
(void) SetImageAlphaChannel(shear_image,OpaqueAlphaChannel,exception); |
|
|
status=XShearImage(shear_image,shear.x,image->columns,image->rows,bounds.x, |
|
|
(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,bounds.width,image->rows,(ssize_t) |
|
|
(shear_image->columns-bounds.width)/2,bounds.y,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); |
|
|
shear_image->alpha_trait=image->alpha_trait; |
|
|
shear_image->compose=image->compose; |
|
|
shear_image->page.width=0; |
|
|
shear_image->page.height=0; |
|
|
if (status == MagickFalse) |
|
|
shear_image=DestroyImage(shear_image); |
|
|
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, |
|
|
bounds; |
|
|
|
|
|
size_t |
|
|
height, |
|
|
rotations, |
|
|
shear_width, |
|
|
width; |
|
|
|
|
|
/* |
|
|
Adjust rotation angle. |
|
|
*/ |
|
|
assert(image != (Image *) NULL); |
|
|
assert(image->signature == MagickCoreSignature); |
|
|
if (image->debug != MagickFalse) |
|
|
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); |
|
|
assert(exception != (ExceptionInfo *) NULL); |
|
|
assert(exception->signature == MagickCoreSignature); |
|
|
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->alpha_trait == UndefinedPixelTrait) |
|
|
(void) SetImageAlphaChannel(integral_image,OpaqueAlphaChannel,exception); |
|
|
/* |
|
|
Compute maximum bounds for 3 shear operations. |
|
|
*/ |
|
|
width=integral_image->columns; |
|
|
height=integral_image->rows; |
|
|
bounds.width=(size_t) floor(fabs((double) height*shear.x)+width+0.5); |
|
|
bounds.height=(size_t) floor(fabs((double) bounds.width*shear.y)+height+0.5); |
|
|
shear_width=(size_t) floor(fabs((double) bounds.height*shear.x)+ |
|
|
bounds.width+0.5); |
|
|
bounds.x=(ssize_t) floor((double) ((shear_width > bounds.width) ? width : |
|
|
bounds.width-shear_width+2)/2.0+0.5); |
|
|
bounds.y=(ssize_t) floor(((double) bounds.height-height+2)/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) bounds.x; |
|
|
border_info.height=(size_t) bounds.y; |
|
|
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,bounds.x,(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,bounds.width,height,(ssize_t) |
|
|
(rotate_image->columns-bounds.width)/2,bounds.y,exception); |
|
|
if (status == MagickFalse) |
|
|
{ |
|
|
rotate_image=DestroyImage(rotate_image); |
|
|
return((Image *) NULL); |
|
|
} |
|
|
status=XShearImage(rotate_image,shear.x,bounds.width,bounds.height,(ssize_t) |
|
|
(rotate_image->columns-bounds.width)/2,(ssize_t) (rotate_image->rows- |
|
|
bounds.height)/2,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); |
|
|
rotate_image->alpha_trait=image->alpha_trait; |
|
|
rotate_image->compose=image->compose; |
|
|
rotate_image->page.width=0; |
|
|
rotate_image->page.height=0; |
|
|
if (status == MagickFalse) |
|
|
rotate_image=DestroyImage(rotate_image); |
|
|
return(rotate_image); |
|
|
}
|
|
|
|
