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/* rotate.c
*
* rotate an image
*
* Contributed by Tom Tatlow (tatlow@dash.enet.dec.com)
*/
#include "copyright.h"
#include "image.h"
/* rotate_bitmap()
* converts an old bitmap bit position into a new one
*/
void rotate_bitmap(num, pos, width, height, new_num, new_pos)
int num; /* Source byte number */
int pos; /* Source bit position */
int width; /* Width of source bitmap */
int height; /* Height of source bitmap */
int *new_num; /* Destination byte number */
int *new_pos; /* Destination bit position */
{
int slen; /* Length of source line */
int dlen; /* Length of destination line */
int sx, sy;
int dx, dy;
slen = (width / 8) + (width % 8 ? 1 : 0);
dlen = (height / 8) + (height % 8 ? 1 : 0);
sy = num / slen;
sx = ((num - (sy * slen)) * 8) + pos;
dx = (height - sy) - 1;
dy = sx;
*new_num = (dx / 8) + (dy * dlen);
*new_pos = dx % 8;
}
/* rotate()
* rotates an image
*/
Image *rotate(simage, degrees, verbose)
Image *simage; /* Image to rotate */
unsigned int degrees; /* Number of degrees to rotate */
unsigned int verbose;
{
char buf[BUFSIZ]; /* New title */
Image *image1; /* Source image */
Image *image2; /* Destination image */
byte *sp; /* Pointer to source data */
byte *dp; /* Pointer to destination data */
int slinelen; /* Length of source line */
int dlinelen; /* Length of destination line */
int bit[8]; /* Array of hex values */
int x, y;
int i, b;
int newx, newy;
int newi, newb;
byte **yptr;
bit[0] = 128;
bit[1] = 64;
bit[2] = 32;
bit[3] = 16;
bit[4] = 8;
bit[5] = 4;
bit[6] = 2;
bit[7] = 1;
goodImage(simage, "rotate");
if (verbose)
{ printf(" Rotating image by %d degrees...", degrees);
fflush(stdout);
}
sprintf(buf, "%s (rotated by %d degrees)", simage->title, degrees);
image1 = simage;
do {
degrees -= 90;
switch (image1->type) {
case IBITMAP:
image2= newBitImage(image1->height, image1->width);
for (x= 0; x < image1->rgb.used; x++) {
*(image2->rgb.red + x)= *(image1->rgb.red + x);
*(image2->rgb.green + x)= *(image1->rgb.green + x);
*(image2->rgb.blue + x)= *(image1->rgb.blue + x);
}
slinelen= (image1->width / 8) + (image1->width % 8 ? 1 : 0);
sp = image1->data;
dp = image2->data;
for (i = 0; i < (slinelen * image1->height); i++)
for (b = 0; b < 8; b++)
if (sp[i] & bit[b])
{ rotate_bitmap(i, b, image1->width, image1->height, &newi, &newb);
dp[newi] |= bit[newb];
}
break;
case IRGB:
image2= newRGBImage(image1->height, image1->width, image1->depth);
for (x= 0; x < image1->rgb.used; x++) {
*(image2->rgb.red + x)= *(image1->rgb.red + x);
*(image2->rgb.green + x)= *(image1->rgb.green + x);
*(image2->rgb.blue + x)= *(image1->rgb.blue + x);
}
image2->rgb.used= image1->rgb.used;
/* FALLTHRU */
case ITRUE:
if (TRUEP(image1))
image2= newTrueImage(image1->height, image1->width);
/* build array of y axis ptrs into destination image
*/
yptr= (byte **)lmalloc(image1->width * sizeof(char *));
dlinelen= image1->height * image1->pixlen;
for (y= 0; y < image1->width; y++)
yptr[y]= image2->data + (y * dlinelen);
/* rotate
*/
sp= image1->data;
for (y = 0; y < image1->height; y++)
for (x = 0; x < image1->width; x++) {
valToMem(memToVal(sp, image1->pixlen),
yptr[x] + ((image1->height - y - 1) * image1->pixlen),
image1->pixlen);
sp += image1->pixlen;
}
lfree((byte *)yptr);
break;
default:
printf("rotate: Unsupported image type\n");
exit(1);
}
if (image1 != simage)
freeImage(image1);
image1 = image2;
} while (degrees);
image1->title= dupString(buf);
if (verbose)
printf("done\n");
return(image1);
}
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