Exemple #1
0
/*
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%   S h e a r I m a g e                                                       %
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%
%  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;

  long
    x_offset,
    y_offset;

  PointInfo
    shear;

  RectangleInfo
    border_info;

  unsigned long
    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(x_shear)));
  shear.y=tan(DegreesToRadians(y_shear));
  if ((shear.x == 0.0) && (shear.y == 0.0))
    return(integral_image);
  if (SetImageStorageClass(integral_image,DirectClass) == MagickFalse)
    {
      InheritException(exception,&integral_image->exception);
      integral_image=DestroyImage(integral_image);
      return(integral_image);
    }
  if (integral_image->matte == MagickFalse)
    (void) SetImageOpacity(integral_image,OpaqueOpacity);
  /*
    Compute image size.
  */
  y_width=image->columns+(long) (fabs(shear.x)*image->rows+0.5);
  x_offset=(long) (image->columns+((fabs(shear.x)*image->rows)-
    image->columns)/2.0+0.5);
  y_offset=(long) (image->rows+((fabs(shear.y)*y_width+0.5)-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=(unsigned long) x_offset;
  border_info.height=(unsigned long) y_offset;
  shear_image=BorderImage(integral_image,&border_info,exception);
  if (shear_image == (Image *) NULL)
    ThrowImageException(ResourceLimitError,"MemoryAllocationFailed");
  integral_image=DestroyImage(integral_image);
  /*
    Shear the image.
  */
  if (shear_image->matte == MagickFalse)
    (void) SetImageOpacity(shear_image,OpaqueOpacity);
  XShearImage(shear_image,shear.x,image->columns,image->rows,x_offset,
    ((long) shear_image->rows-image->rows)/2);
  YShearImage(shear_image,shear.y,y_width,image->rows,
    ((long) shear_image->columns-y_width)/2,y_offset);
  CropToFitImage(&shear_image,shear.x,shear.y,(MagickRealType) image->columns,
    (MagickRealType) image->rows,MagickFalse,exception);
  shear_image->compose=image->compose;
  shear_image->page.width=0;
  shear_image->page.height=0;
  return(shear_image);
}
Exemple #2
0
/*
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%   S h e a r I m a g e                                                       %
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%
%  Method 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 color defined by the pixel at location (0,0).  ShearImage
%  allocates the memory necessary for the new Image structure and returns
%  a pointer to the new image.
%
%  Method 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 status: Method ShearImage returns a pointer to the image after
%      rotating.  A null image is returned if there is a memory shortage.
%
%    o image: The image;  returned from
%      ReadImage.
%
%    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;

  long
    x_offset,
    y_offset;

  PointInfo
    shear;

  RectangleInfo
    border_info;

  unsigned long
    y_width;

  assert(image != (Image *) NULL);
  assert(image->signature == MagickSignature);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  if ((x_shear == 180.0) || (y_shear == 180.0))
    ThrowImageException3(ImageError,UnableToShearImage,AngleIsDiscontinuous);

  /*
    Initialize shear angle.
  */
  integral_image=IntegralRotateImage(image,0,exception);
  if (integral_image == (Image *) NULL)
    ThrowImageException3(ResourceLimitError,MemoryAllocationFailed,
      UnableToShearImage);
  shear.x=(-tan(DegreesToRadians(x_shear)/2.0));
  shear.y=sin(DegreesToRadians(y_shear));
  if ((shear.x == 0.0) || (shear.y == 0.0))
    return(integral_image);

  /*
    Compute image size.
  */
  x_offset=(long) ceil(fabs(2.0*image->rows*shear.x)-0.5);
  y_width=(unsigned long) floor(fabs(image->rows*shear.x)+image->columns+0.5);
  y_offset=(long) ceil(fabs(y_width*shear.y)-0.5);
  /*
    Surround image with border.
  */
  integral_image->border_color=integral_image->background_color;
  border_info.width=x_offset;
  border_info.height=y_offset;
  shear_image=BorderImage(integral_image,&border_info,exception);
  if (shear_image == (Image *) NULL)
    ThrowImageException3(ResourceLimitError,MemoryAllocationFailed,
      UnableToShearImage);
  DestroyImage(integral_image);
  /*
    Shear the image.
  */
  shear_image->storage_class=DirectClass;
  shear_image->matte|=shear_image->background_color.opacity != OpaqueOpacity;
  XShearImage(shear_image,shear.x,image->columns,image->rows,x_offset,
    (long) (shear_image->rows-image->rows)/2);
  YShearImage(shear_image,shear.y,y_width,image->rows,
    (long) (shear_image->columns-y_width)/2,y_offset);
  CropToFitImage(&shear_image,shear.x,shear.y,image->columns,image->rows,
    False,exception);
  shear_image->page.width=0;
  shear_image->page.height=0;
  return(shear_image);
}
Exemple #3
0
/*
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%   R o t a t e I m a g e                                                     %
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%
%  RotateImage() 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.  RotateImage
%  allocates the memory necessary for the new Image structure and returns a
%  pointer to the new image.
%
%  RotateImage() is based on the paper "A Fast Algorithm for General
%  Raster Rotatation" by Alan W. Paeth.  RotateImage 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 RotateImage method is:
%
%      Image *RotateImage(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 *RotateImage(const Image *image,const double degrees,
  ExceptionInfo *exception)
{
  Image
    *integral_image,
    *rotate_image;

  long
    x_offset,
    y_offset;

  MagickRealType
    angle;

  PointInfo
    shear;

  RectangleInfo
    border_info;

  unsigned long
    height,
    rotations,
    width,
    y_width;

  /*
    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) == MagickFalse)
    {
      InheritException(exception,&integral_image->exception);
      integral_image=DestroyImage(integral_image);
      return(integral_image);
    }
  if (integral_image->matte == MagickFalse)
    (void) SetImageOpacity(integral_image,OpaqueOpacity);
  /*
    Compute image size.
  */
  width=image->columns;
  height=image->rows;
  if ((rotations == 1) || (rotations == 3))
    {
      width=image->rows;
      height=image->columns;
    }
  y_width=width+(long) (fabs(shear.x)*height+0.5);
  x_offset=(long) (width+((fabs(shear.y)*height+0.5)-width)/2.0+0.5);
  y_offset=(long) (height+((fabs(shear.y)*y_width+0.5)-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=(unsigned long) x_offset;
  border_info.height=(unsigned long) y_offset;
  rotate_image=BorderImage(integral_image,&border_info,exception);
  integral_image=DestroyImage(integral_image);
  if (rotate_image == (Image *) NULL)
    ThrowImageException(ResourceLimitError,"MemoryAllocationFailed");
  /*
    Rotate the image.
  */
  XShearImage(rotate_image,shear.x,width,height,x_offset,
    ((long) rotate_image->rows-height)/2);
  YShearImage(rotate_image,shear.y,y_width,height,
    ((long) rotate_image->columns-y_width)/2,y_offset);
  XShearImage(rotate_image,shear.x,y_width,rotate_image->rows,
    ((long) rotate_image->columns-y_width)/2,0);
  CropToFitImage(&rotate_image,shear.x,shear.y,(MagickRealType) width,
    (MagickRealType) height,MagickTrue,exception);
  rotate_image->compose=image->compose;
  rotate_image->page.width=0;
  rotate_image->page.height=0;
  return(rotate_image);
}
Exemple #4
0
/*
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%   R o t a t e I m a g e                                                     %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method RotateImage 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 color
%  specified by the image background_color.  RotateImage allocates the memory
%  necessary for the new Image structure and returns a pointer to the new
%  image.
%
%  Method RotateImage is based on the paper "A Fast Algorithm for General
%  Raster Rotatation" by Alan W. Paeth.  RotateImage 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 RotateImage method is:
%
%      Image *RotateImage(const Image *image,const double degrees,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows.
%
%    o status: Method RotateImage returns a pointer to the image after
%      rotating.  A null image is returned if there is a memory shortage.
%
%    o image: The image;  returned from
%      ReadImage.
%
%    o degrees: Specifies the number of degrees to rotate the image.
%
%    o exception: Return any errors or warnings in this structure.
%
%
*/
MagickExport Image *RotateImage(const Image *image,const double degrees,
  ExceptionInfo *exception)
{
  double
    angle;

  Image
    *integral_image,
    *rotate_image;

  long
    x_offset,
    y_offset;

  PointInfo
    shear;

  RectangleInfo
    border_info;

  unsigned long
    height,
    rotations,
    width,
    y_width;

  /*
    Adjust rotation angle.
  */
  assert(image != (Image *) NULL);
  assert(image->signature == MagickSignature);
  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)
    ThrowImageException3(ResourceLimitError,MemoryAllocationFailed,
      UnableToRotateImage);
  shear.x=(-tan(DegreesToRadians(angle)/2.0));
  shear.y=sin(DegreesToRadians(angle));
  if ((shear.x == 0.0) || (shear.y == 0.0))
    return(integral_image);
  /*
    Compute image size.
  */
  width=image->columns;
  height=image->rows;
  if ((rotations == 1) || (rotations == 3))
    {
      width=image->rows;
      height=image->columns;
    }
  x_offset=(long) ceil(fabs(2.0*height*shear.y)-0.5);
  y_width=(unsigned long) floor(fabs(height*shear.x)+width+0.5);
  y_offset=(long) ceil(fabs(y_width*shear.y)-0.5);
  /*
    Surround image with a border.
  */
  integral_image->border_color=integral_image->background_color;
  border_info.width=x_offset;
  border_info.height=y_offset;
  rotate_image=BorderImage(integral_image,&border_info,exception);
  DestroyImage(integral_image);
  if (rotate_image == (Image *) NULL)
    ThrowImageException3(ResourceLimitError,MemoryAllocationFailed,
      UnableToRotateImage);
  /*
    Rotate the image.
  */
  rotate_image->storage_class=DirectClass;
  rotate_image->matte|=rotate_image->background_color.opacity != OpaqueOpacity;
  XShearImage(rotate_image,shear.x,width,height,x_offset,
    (long) (rotate_image->rows-height)/2);
  YShearImage(rotate_image,shear.y,y_width,height,
    (long) (rotate_image->columns-y_width)/2,y_offset);
  XShearImage(rotate_image,shear.x,y_width,rotate_image->rows,
    (long) (rotate_image->columns-y_width)/2,0);
  CropToFitImage(&rotate_image,shear.x,shear.y,width,height,True,exception);
  rotate_image->page.width=0;
  rotate_image->page.height=0;
  return(rotate_image);
}