pike.git/ src/ modules/ Image/ dct.c

1997-04-03

1997-04-03 07:00:46 by Mirar (Pontus Hagland) <pike@sort.mirar.org>

• e3cb4b5ec7037b5a3715a5a55b004172d725651e (35 lines) (+33/-2) ^{[ Show | Annotate ]}
  Branch: 7.9

documentation

Rev: src/modules/Image/blit.c:1.6
Rev: src/modules/Image/dct.c:1.5
Rev: src/modules/Image/font.c:1.5
Rev: src/modules/Image/image.c:1.20
Rev: src/modules/Image/matrix.c:1.4
Rev: src/modules/Image/operator.c:1.5
Rev: src/modules/Image/pnm.c:1.3
Rev: src/modules/Image/togif.c:1.6
Rev: src/modules/Image/x.c:1.6

1: - /* $Id: dct.c,v 1.4 1997/03/17 03:07:59 hubbe Exp $ */ + /* $Id: dct.c,v 1.5 1997/04/03 07:00:13 mirar Exp $ */    -  + /* + **! module Image + **! class image + */ +    #include "global.h"      #include <math.h>
29:   static const double c0=0.70710678118654752440;   static const double pi=3.14159265358979323846;    + /* + **! method object dct(int newx,int newy) + **! Scales the image to a new size. + **! + **! Method for scaling is rather complex; + **! the image is transformed via a cosine transform, + **! and then resampled back. + **! + **! This gives a quality-conserving upscale, + **! but the algorithm used is n*n+n*m, where n + **! and m is pixels in the original and new image. + **! + **! Recommended wrapping algorithm is to scale + **! overlapping parts of the image-to-be-scaled. + **! + **! This functionality is actually added as an + **! true experiment, but works... + **! returns the new image object + **! arg int newx + **! arg int newy + **! new image size in pixels + **! + */ +    void image_dct(INT32 args)   {    rgbd_group *area,*val;
67:    }    else error("Illegal arguments to image->dct()\n");    -  if (!(img->img=malloc(sizeof(rgb_group)*img->xsize*img->ysize+1))) +  if (!(img->img=(rgb_group*)malloc(sizeof(rgb_group)* +  img->xsize*img->ysize+1)))    {    free(area);    free(costbl);