+++ /dev/null
-/*
- * "$Id: image-zoom.c 6649 2007-07-11 21:46:42Z mike $"
- *
- * cupsImage zoom routines for CUPS.
- *
- * Copyright 2007-2011 by Apple Inc.
- * Copyright 1993-2006 by Easy Software Products.
- *
- * These coded instructions, statements, and computer programs are the
- * property of Apple Inc. and are protected by Federal copyright
- * law. Distribution and use rights are outlined in the file "LICENSE.txt"
- * which should have been included with this file. If this file is
- * file is missing or damaged, see the license at "http://www.cups.org/".
- *
- * This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- * _cupsImageZoomDelete() - Free a zoom record...
- * _cupsImageZoomFill() - Fill a zoom record...
- * _cupsImageZoomNew() - Allocate a pixel zoom record...
- * zoom_bilinear() - Fill a zoom record with image data utilizing
- * bilinear interpolation.
- * zoom_nearest() - Fill a zoom record quickly using nearest-neighbor
- * sampling.
- */
-
-/*
- * Include necessary headers...
- */
-
-#include "image-private.h"
-
-
-/*
- * Local functions...
- */
-
-static void zoom_bilinear(cups_izoom_t *z, int iy);
-static void zoom_nearest(cups_izoom_t *z, int iy);
-
-
-/*
- * '_cupsImageZoomDelete()' - Free a zoom record...
- */
-
-void
-_cupsImageZoomDelete(cups_izoom_t *z) /* I - Zoom record to free */
-{
- free(z->rows[0]);
- free(z->rows[1]);
- free(z->in);
- free(z);
-}
-
-
-/*
- * '_cupsImageZoomFill()' - Fill a zoom record with image data utilizing bilinear
- * interpolation.
- */
-
-void
-_cupsImageZoomFill(cups_izoom_t *z, /* I - Zoom record to fill */
- int iy) /* I - Zoom image row */
-{
- switch (z->type)
- {
- case CUPS_IZOOM_FAST :
- zoom_nearest(z, iy);
- break;
-
- default :
- zoom_bilinear(z, iy);
- break;
- }
-}
-
-
-/*
- * '_cupsImageZoomNew()' - Allocate a pixel zoom record...
- */
-
-cups_izoom_t *
-_cupsImageZoomNew(
- cups_image_t *img, /* I - cupsImage to zoom */
- int xc0, /* I - Upper-lefthand corner */
- int yc0, /* I - ... */
- int xc1, /* I - Lower-righthand corner */
- int yc1, /* I - ... */
- int xsize, /* I - Final width of image */
- int ysize, /* I - Final height of image */
- int rotated, /* I - Non-zero if image is rotated 90 degs */
- cups_iztype_t type) /* I - Zoom type */
-{
- cups_izoom_t *z; /* New zoom record */
- int flip; /* Flip on X axis? */
-
-
- if (xsize > CUPS_IMAGE_MAX_WIDTH ||
- ysize > CUPS_IMAGE_MAX_HEIGHT ||
- (xc1 - xc0) > CUPS_IMAGE_MAX_WIDTH ||
- (yc1 - yc0) > CUPS_IMAGE_MAX_HEIGHT)
- return (NULL); /* Protect against integer overflow */
-
- if ((z = (cups_izoom_t *)calloc(1, sizeof(cups_izoom_t))) == NULL)
- return (NULL);
-
- z->img = img;
- z->row = 0;
- z->depth = cupsImageGetDepth(img);
- z->rotated = rotated;
- z->type = type;
-
- if (xsize < 0)
- {
- flip = 1;
- xsize = -xsize;
- }
- else
- {
- flip = 0;
- }
-
- if (rotated)
- {
- z->xorig = xc1;
- z->yorig = yc0;
- z->width = yc1 - yc0 + 1;
- z->height = xc1 - xc0 + 1;
- z->xsize = xsize;
- z->ysize = ysize;
- z->xmod = z->width % z->xsize;
- z->xstep = z->width / z->xsize;
- z->xincr = 1;
- z->ymod = z->height % z->ysize;
- z->ystep = z->height / z->ysize;
- z->yincr = 1;
- z->instep = z->xstep * z->depth;
- z->inincr = /* z->xincr * */ z->depth; /* z->xincr is always 1 */
-
- if (z->width < img->ysize)
- z->xmax = z->width;
- else
- z->xmax = z->width - 1;
-
- if (z->height < img->xsize)
- z->ymax = z->height;
- else
- z->ymax = z->height - 1;
- }
- else
- {
- z->xorig = xc0;
- z->yorig = yc0;
- z->width = xc1 - xc0 + 1;
- z->height = yc1 - yc0 + 1;
- z->xsize = xsize;
- z->ysize = ysize;
- z->xmod = z->width % z->xsize;
- z->xstep = z->width / z->xsize;
- z->xincr = 1;
- z->ymod = z->height % z->ysize;
- z->ystep = z->height / z->ysize;
- z->yincr = 1;
- z->instep = z->xstep * z->depth;
- z->inincr = /* z->xincr * */ z->depth; /* z->xincr is always 1 */
-
- if (z->width < img->xsize)
- z->xmax = z->width;
- else
- z->xmax = z->width - 1;
-
- if (z->height < img->ysize)
- z->ymax = z->height;
- else
- z->ymax = z->height - 1;
- }
-
- if (flip)
- {
- z->instep = -z->instep;
- z->inincr = -z->inincr;
- }
-
- if ((z->rows[0] = (cups_ib_t *)malloc(z->xsize * z->depth)) == NULL)
- {
- free(z);
- return (NULL);
- }
-
- if ((z->rows[1] = (cups_ib_t *)malloc(z->xsize * z->depth)) == NULL)
- {
- free(z->rows[0]);
- free(z);
- return (NULL);
- }
-
- if ((z->in = (cups_ib_t *)malloc(z->width * z->depth)) == NULL)
- {
- free(z->rows[0]);
- free(z->rows[1]);
- free(z);
- return (NULL);
- }
-
- return (z);
-}
-
-
-/*
- * 'zoom_bilinear()' - Fill a zoom record with image data utilizing bilinear
- * interpolation.
- */
-
-static void
-zoom_bilinear(cups_izoom_t *z, /* I - Zoom record to fill */
- int iy) /* I - Zoom image row */
-{
- cups_ib_t *r, /* Row pointer */
- *inptr; /* Pixel pointer */
- int xerr0, /* X error counter */
- xerr1; /* ... */
- int ix,
- x,
- count,
- z_depth,
- z_xstep,
- z_xincr,
- z_instep,
- z_inincr,
- z_xmax,
- z_xmod,
- z_xsize;
-
-
- if (iy > z->ymax)
- iy = z->ymax;
-
- z->row ^= 1;
-
- z_depth = z->depth;
- z_xsize = z->xsize;
- z_xmax = z->xmax;
- z_xmod = z->xmod;
- z_xstep = z->xstep;
- z_xincr = z->xincr;
- z_instep = z->instep;
- z_inincr = z->inincr;
-
- if (z->rotated)
- cupsImageGetCol(z->img, z->xorig - iy, z->yorig, z->width, z->in);
- else
- cupsImageGetRow(z->img, z->xorig, z->yorig + iy, z->width, z->in);
-
- if (z_inincr < 0)
- inptr = z->in + (z->width - 1) * z_depth;
- else
- inptr = z->in;
-
- for (x = z_xsize, xerr0 = z_xsize, xerr1 = 0, ix = 0, r = z->rows[z->row];
- x > 0;
- x --)
- {
- if (ix < z_xmax)
- {
- for (count = 0; count < z_depth; count ++)
- *r++ = (inptr[count] * xerr0 + inptr[z_depth + count] * xerr1) / z_xsize;
- }
- else
- {
- for (count = 0; count < z_depth; count ++)
- *r++ = inptr[count];
- }
-
- ix += z_xstep;
- inptr += z_instep;
- xerr0 -= z_xmod;
- xerr1 += z_xmod;
-
- if (xerr0 <= 0)
- {
- xerr0 += z_xsize;
- xerr1 -= z_xsize;
- ix += z_xincr;
- inptr += z_inincr;
- }
- }
-}
-
-
-/*
- * 'zoom_nearest()' - Fill a zoom record quickly using nearest-neighbor
- * sampling.
- */
-
-static void
-zoom_nearest(cups_izoom_t *z, /* I - Zoom record to fill */
- int iy) /* I - Zoom image row */
-{
- cups_ib_t *r, /* Row pointer */
- *inptr; /* Pixel pointer */
- int xerr0; /* X error counter */
- int ix,
- x,
- count,
- z_depth,
- z_xstep,
- z_xincr,
- z_instep,
- z_inincr,
- z_xmod,
- z_xsize;
-
-
- if (iy > z->ymax)
- iy = z->ymax;
-
- z->row ^= 1;
-
- z_depth = z->depth;
- z_xsize = z->xsize;
- z_xmod = z->xmod;
- z_xstep = z->xstep;
- z_xincr = z->xincr;
- z_instep = z->instep;
- z_inincr = z->inincr;
-
- if (z->rotated)
- cupsImageGetCol(z->img, z->xorig - iy, z->yorig, z->width, z->in);
- else
- cupsImageGetRow(z->img, z->xorig, z->yorig + iy, z->width, z->in);
-
- if (z_inincr < 0)
- inptr = z->in + (z->width - 1) * z_depth;
- else
- inptr = z->in;
-
- for (x = z_xsize, xerr0 = z_xsize, ix = 0, r = z->rows[z->row];
- x > 0;
- x --)
- {
- for (count = 0; count < z_depth; count ++)
- *r++ = inptr[count];
-
- ix += z_xstep;
- inptr += z_instep;
- xerr0 -= z_xmod;
-
- if (xerr0 <= 0)
- {
- xerr0 += z_xsize;
- ix += z_xincr;
- inptr += z_inincr;
- }
- }
-}
-
-
-/*
- * End of "$Id: image-zoom.c 6649 2007-07-11 21:46:42Z mike $".
- */
projects / thirdparty / cups.git / blobdiff