1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/* Exercise all scaling with all interpolation modes and ensure that
* at least, something comes back. */
#include <stdio.h>
#include "gd.h"
#define X 100
#define Y 100
#define NX 100
#define NY 100
gdImagePtr loadImage(const char *name)
{
FILE *fp;
gdImagePtr im;
fp = fopen(name, "rb");
if (!fp) {
fprintf(stderr, "Can't open jpeg file\n");
return NULL;
}
im = gdImageCreateFromPng(fp);
fclose(fp);
return im;
}
int savePngImage(gdImagePtr im, const char *name)
{
FILE *fp;
fp = fopen(name, "wb");
if (!fp) {
fprintf(stderr, "Can't save png image fromtiff.png\n");
return 0;
}
gdImagePng(im, fp);
fclose(fp);
return 1;
}
int main() {
unsigned int method;
gdImagePtr src;
src = loadImage("fillandstroke.png");
if (!src) {
printf("cannot open src image");
exit(1);
}
int new_width = gdImageSX(src) *3;
int new_height = gdImageSY(src) *3;
for(method = GD_DEFAULT; method < GD_METHOD_COUNT; method++) { /* GD_WEIGHTED4 is unsupported. */
gdImagePtr result;
if (method == GD_WEIGHTED4) {
continue;
}
gdImageSetInterpolationMethod(src, method);
printf("arg %i set: %i get %i\n", method, src->interpolation_id, gdImageGetInterpolationMethod(src));
result = gdImageScale(src, new_width, new_height);
if (result == NULL) {
printf("gdImageScale failed (method: %i).\n", method);
break;
}
if (result->sx != new_width || result->sy != new_height) {
printf("missmatch width or height\n");
gdImageDestroy(result);
gdImageDestroy(src);
exit(1);
}
char filename[255];
sprintf(filename, "scale_%i.png", method);
savePngImage(result, filename);
gdImageDestroy(result);
}/* for*/
gdImageDestroy(src);
return 0;
}
|
