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Less blurry thumbnail scaling

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This commit is contained in:
Simon Robertshaw 2011-06-08 13:30:39 +01:00
parent b5856bfa47
commit b5c9d86fbe
3 changed files with 16 additions and 2 deletions
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2
includes/graphics.h
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@ -52,6 +52,8 @@ void *ptif_pack(pixel *src, int w, int h, int *result_size);
pixel *ptif_unpack(void *datain, int size, int *w, int *h); pixel *ptif_unpack(void *datain, int size, int *w, int *h);
pixel *resample_img_nn(pixel *src, int sw, int sh, int rw, int rh);
pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh); pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh);
pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f); pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f);

12
src/graphics.c
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@ -140,6 +140,18 @@ pixel *ptif_unpack(void *datain, int size, int *w, int *h){
return result; return result;
} }
pixel *resample_img_nn(pixel * src, int sw, int sh, int rw, int rh)
{
int y, x;
pixel *q = NULL;
q = malloc(rw*rh*PIXELSIZE);
for (y=0; y<rh; y++)
for (x=0; x<rw; x++){
q[rw*y+x] = src[sw*(y*sh/rh)+(x*sw/rw)];
}
return q;
}
pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh) pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh)
{ {
int y, x; int y, x;

4
src/main.c
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@ -1482,8 +1482,8 @@ int main(int argc, char *argv[])
free(datares); free(datares);
datares = NULL; datares = NULL;
} }
scaled_buf = resample_img(vid_buf, XRES, YRES, XRES/4, YRES/4); scaled_buf = resample_img(vid_buf, XRES, YRES, XRES/GRID_Z, YRES/GRID_Z);
datares = ptif_pack(scaled_buf, XRES/4, YRES/4, &res); datares = ptif_pack(scaled_buf, XRES/GRID_Z, YRES/GRID_Z, &res);
if(datares!=NULL){ if(datares!=NULL){
f=fopen(ptismallfilename, "wb"); f=fopen(ptismallfilename, "wb");
fwrite(datares, res, 1, f); fwrite(datares, res, 1, f);