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Fixed a bug in scaling code.

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dan
2000-01-15 22:11:18 +00:00
parent 049a69a9bf
commit b7296cff16
1 changed files with 3 additions and 9 deletions
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12
wrlib/scale.c
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@@ -79,14 +79,11 @@ RScaleImage(RImage *image, unsigned new_width, unsigned new_height)
d = img->data; d = img->data;
if (image->format == RRGBAFormat) { if (image->format == RRGBAFormat) {
int ot;
ot = -1;
for (y=0; y<new_height; y++) { for (y=0; y<new_height; y++) {
t = image->width*(py>>16); t = image->width*(py>>16);
s = image->data+t; s = image->data+(t<<2); /* image->data+t*4 */
ot = t;
ox = 0; ox = 0;
px = 0; px = 0;
for (x=0; x<new_width; x++) { for (x=0; x<new_width; x++) {
@@ -105,14 +102,11 @@ RScaleImage(RImage *image, unsigned new_width, unsigned new_height)
py += dy; py += dy;
} }
} else { } else {
int ot;
ot = -1;
for (y=0; y<new_height; y++) { for (y=0; y<new_height; y++) {
t = image->width*(py>>16); t = image->width*(py>>16);
s = image->data+t; s = image->data+(t<<1)+t; /* image->data+t*3 */
ot = t;
ox = 0; ox = 0;
px = 0; px = 0;
for (x=0; x<new_width; x++) { for (x=0; x<new_width; x++) {
@@ -122,7 +116,7 @@ RScaleImage(RImage *image, unsigned new_width, unsigned new_height)
*(d++) = *(s+1); *(d++) = *(s+1);
*(d++) = *(s+2); *(d++) = *(s+2);
t = (px-ox)>>16; t = (px - ox)>>16;
ox += t<<16; ox += t<<16;
s += (t<<1)+t; /* t*3 */ s += (t<<1)+t; /* t*3 */