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Functions
scaleimg.h File Reference

Go to the source code of this file.

## Functions

void | scale_image (IMAGE &image, IMAGE &target_image)
void | scale_image_cop_out (IMAGE &image, IMAGE &target_image, float factor, int *hires, int *lores, int *oldhires, int *oldlores)

## Function Documentation

void scale_image | ( | IMAGE & | image,
|  | IMAGE & | target_image
| ) |  |

Definition at line 42 of file scaleimg.cpp.

{
inT32 xsize, ysize, new_xsize, new_ysize;
IMAGELINE line, new_line;
int *hires, *lores, *oldhires, *oldlores;
int i, j, n, oldn, row, col;
int offset = 0; //not used here
float factor;
uinT8 curr_colour, new_colour;
int dummy = -1;
IMAGE image2; //horiz scaled image
xsize = image.get_xsize ();
ysize = image.get_ysize ();
new_xsize = target_image.get_xsize ();
new_ysize = target_image.get_ysize ();
if (new_ysize > new_xsize)
new_line.init (new_ysize);
else
new_line.init (new_xsize);
factor = (float) xsize / (float) new_xsize;
hires = (int *) calloc (xsize, sizeof (int));
lores = (int *) calloc (new_xsize, sizeof (int));
oldhires = (int *) calloc (xsize, sizeof (int));
oldlores = (int *) calloc (new_xsize, sizeof (int));
if ((hires == NULL) || (lores == NULL) || (oldhires == NULL)
|| (oldlores == NULL)) {
fprintf (stderr, "Calloc error in scale_image\n");
err_exit();
}
image2.create (new_xsize, ysize, image.get_bpp ());
oldn = 0;
/* do first row separately because hires[col-1] doesn't make sense here */
image.fast_get_line (0, 0, xsize, &line);
/* each line nominally begins with white */
curr_colour = 1;
n = 0;
for (i = 0; i < xsize; i++) {
new_colour = *(line.pixels + i);
if (new_colour != curr_colour) {
hires[n] = i;
n++;
curr_colour = new_colour;
}
}
if (offset != 0)
for (i = 0; i < n; i++)
hires[i] += offset;
if (n > new_xsize) {
tprintf ("Too many transitions (%d) on line 0\n", n);
scale_image_cop_out(image,
target_image,
factor,
hires,
lores,
oldhires,
oldlores);
return;
}
else if (n > 0)
dyn_prog (n, hires, lores, new_xsize, &dummy, &dummy, 0, factor);
else
lores[0] = new_xsize;
curr_colour = 1;
j = 0;
for (i = 0; i < new_xsize; i++) {
if (lores[j] == i) {
curr_colour = 1 - curr_colour;
j++;
}
*(new_line.pixels + i) = curr_colour;
}
image2.put_line (0, 0, new_xsize, &new_line, 0);
for (i = 0; i < n; i++) {
oldhires[i] = hires[i];
oldlores[i] = lores[i];
}
for (i = n; i < oldn; i++) {
oldhires[i] = 0;
oldlores[i] = 0;
}
oldn = n;
for (row = 1; row < ysize; row++) {
image.fast_get_line (0, row, xsize, &line);
/* each line nominally begins with white */
curr_colour = 1;
n = 0;
for (i = 0; i < xsize; i++) {
new_colour = *(line.pixels + i);
if (new_colour != curr_colour) {
hires[n] = i;
n++;
curr_colour = new_colour;
}
}
for (i = n; i < oldn; i++) {
hires[i] = 0;
lores[i] = 0;
}
if (offset != 0)
for (i = 0; i < n; i++)
hires[i] += offset;
if (n > new_xsize) {
tprintf ("Too many transitions (%d) on line %d\n", n, row);
scale_image_cop_out(image,
target_image,
factor,
hires,
lores,
oldhires,
oldlores);
return;
}
else if (n > 0)
dyn_prog(n, hires, lores, new_xsize, oldhires, oldlores, oldn, factor);
else
lores[0] = new_xsize;
curr_colour = 1;
j = 0;
for (i = 0; i < new_xsize; i++) {
if (lores[j] == i) {
curr_colour = 1 - curr_colour;
j++;
}
*(new_line.pixels + i) = curr_colour;
}
image2.put_line (0, row, new_xsize, &new_line, 0);
for (i = 0; i < n; i++) {
oldhires[i] = hires[i];
oldlores[i] = lores[i];
}
for (i = n; i < oldn; i++) {
oldhires[i] = 0;
oldlores[i] = 0;
}
oldn = n;
}
free(hires);
free(lores);
free(oldhires);
free(oldlores);
/* NOW DO THE VERTICAL SCALING from image2 to target_image*/
xsize = new_xsize;
factor = (float) ysize / (float) new_ysize;
offset = 0;
hires = (int *) calloc (ysize, sizeof (int));
lores = (int *) calloc (new_ysize, sizeof (int));
oldhires = (int *) calloc (ysize, sizeof (int));
oldlores = (int *) calloc (new_ysize, sizeof (int));
if ((hires == NULL) || (lores == NULL) || (oldhires == NULL)
|| (oldlores == NULL)) {
fprintf (stderr, "Calloc error in scale_image (vert)\n");
err_exit();
}
oldn = 0;
/* do first col separately because hires[col-1] doesn't make sense here */
image2.get_column (0, 0, ysize, &line, 0);
/* each line nominally begins with white */
curr_colour = 1;
n = 0;
for (i = 0; i < ysize; i++) {
new_colour = *(line.pixels + i);
if (new_colour != curr_colour) {
hires[n] = i;
n++;
curr_colour = new_colour;
}
}
if (offset != 0)
for (i = 0; i < n; i++)
hires[i] += offset;
if (n > new_ysize) {
tprintf ("Too many transitions (%d) on column 0\n", n);
scale_image_cop_out(image,
target_image,
factor,
hires,
lores,
oldhires,
oldlores);
return;
}
else if (n > 0)
dyn_prog (n, hires, lores, new_ysize, &dummy, &dummy, 0, factor);
else
lores[0] = new_ysize;
curr_colour = 1;
j = 0;
for (i = 0; i < new_ysize; i++) {
if (lores[j] == i) {
curr_colour = 1 - curr_colour;
j++;
}
*(new_line.pixels + i) = curr_colour;
}
target_image.put_column (0, 0, new_ysize, &new_line, 0);
for (i = 0; i < n; i++) {
oldhires[i] = hires[i];
oldlores[i] = lores[i];
}
for (i = n; i < oldn; i++) {
oldhires[i] = 0;
oldlores[i] = 0;
}
oldn = n;
for (col = 1; col < xsize; col++) {
image2.get_column (col, 0, ysize, &line, 0);
/* each line nominally begins with white */
curr_colour = 1;
n = 0;
for (i = 0; i < ysize; i++) {
new_colour = *(line.pixels + i);
if (new_colour != curr_colour) {
hires[n] = i;
n++;
curr_colour = new_colour;
}
}
for (i = n; i < oldn; i++) {
hires[i] = 0;
lores[i] = 0;
}
if (offset != 0)
for (i = 0; i < n; i++)
hires[i] += offset;
if (n > new_ysize) {
tprintf ("Too many transitions (%d) on column %d\n", n, col);
scale_image_cop_out(image,
target_image,
factor,
hires,
lores,
oldhires,
oldlores);
return;
}
else if (n > 0)
dyn_prog(n, hires, lores, new_ysize, oldhires, oldlores, oldn, factor);
else
lores[0] = new_ysize;
curr_colour = 1;
j = 0;
for (i = 0; i < new_ysize; i++) {
if (lores[j] == i) {
curr_colour = 1 - curr_colour;
j++;
}
*(new_line.pixels + i) = curr_colour;
}
target_image.put_column (col, 0, new_ysize, &new_line, 0);
for (i = 0; i < n; i++) {
oldhires[i] = hires[i];
oldlores[i] = lores[i];
}
for (i = n; i < oldn; i++) {
oldhires[i] = 0;
oldlores[i] = 0;
}
oldn = n;
}
free(hires);
free(lores);
free(oldhires);
free(oldlores);
}

void scale_image_cop_out | ( | IMAGE & | image,
|  | IMAGE & | target_image,
|  | float | factor,
|  | int * | hires,
|  | int * | lores,
|  | int * | oldhires,
|  | int * | oldlores
| ) |  |

Definition at line 343 of file scaleimg.cpp.

{
inT32 xsize, ysize, new_xsize, new_ysize;
xsize = image.get_xsize ();
ysize = image.get_ysize ();
new_xsize = target_image.get_xsize ();
new_ysize = target_image.get_ysize ();
if (factor <= 0.5)
reduce_sub_image (&image, 0, 0, xsize, ysize,
&target_image, 0, 0, (inT32) (1.0 / factor), FALSE);
else if (factor >= 2)
enlarge_sub_image (&image, 0, 0, &target_image,
0, 0, new_xsize, new_ysize, (inT32) factor, FALSE);
else
copy_sub_image (&image, 0, 0, xsize, ysize, &target_image, 0, 0, FALSE);
free(hires);
free(lores);
free(oldhires);
free(oldlores);
}