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This commit is contained in:
Glenn Maynard
2002-10-31 01:27:45 +00:00
parent 9ccf8cd26f
commit cae3cfc0a0
1 changed files with 58 additions and 64 deletions
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stepmania/src/SDL_rotozoom.cpp
+58 -64
View File
@@ -2,13 +2,7 @@
SDL_rotozoom.c - rotozoomer for 32bit or 8bit surfaces
LGPL (c) A. Schiffler
This file is indented with a tab size of 8, unlike the rest of the SM
source which has a tab size of 4. I'm leaving it that way so I can
send patches upstream. (Since 8 is the de-facto standard tab size,
it'd be nice to fix the rest of the source to use it, but I don't want
to do a full-source commit ...) -glenn
LGPL (c) A. Schiffler, Glenn Maynard
*/
#include "SDL_rotozoom.h"
@@ -55,83 +49,83 @@ void zoomSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst)
* 1..2, so sax[0] is 1. sx is the total number of pixels, so sx/2 is the
* distance from the start of the sample to its center. */
for (x = 0; x < dst->w; x++) {
float sax = sx*x + sx/2;
float sax = sx*x + sx/2;
/* sx/2 is the distance from the start of the sample to the center;
* sx/4 is the distance from the center of the sample to the center of
* either pixel. */
float xstep = sx/4;
/* sx/2 is the distance from the start of the sample to the center;
* sx/4 is the distance from the center of the sample to the center of
* either pixel. */
float xstep = sx/4;
/* source x coordinates of left and right pixels to sample */
esx0.push_back(int(sax-xstep));
esx1.push_back(int(sax+xstep));
/* source x coordinates of left and right pixels to sample */
esx0.push_back(int(sax-xstep));
esx1.push_back(int(sax+xstep));
if(esx1[x] == esx0[x]) {
/* If the sampled pixels happen to be the same, the distance
* will be 0. Avoid division by zero. */
ex0.push_back(1.f);
} else {
int xdist = esx1[x] - esx0[x];
if(esx1[x] == esx0[x]) {
/* If the sampled pixels happen to be the same, the distance
* will be 0. Avoid division by zero. */
ex0.push_back(1.f);
} else {
int xdist = esx1[x] - esx0[x];
/* fleft is the left pixel sampled; +.5 is the center: */
float fleft = esx0[x] + .5f;
/* sax is somewhere between the centers of both sampled
* pixels; find the percentage: */
float p = (sax - fleft) / xdist;
ex0.push_back(1-p);
}
/* fleft is the left pixel sampled; +.5 is the center: */
float fleft = esx0[x] + .5f;
/* sax is somewhere between the centers of both sampled
* pixels; find the percentage: */
float p = (sax - fleft) / xdist;
ex0.push_back(1-p);
}
}
for (y = 0; y < dst->h; y++) {
float say = sy*y + sy/2;
float say = sy*y + sy/2;
float ystep = sy/4;
float ystep = sy/4;
esy0.push_back(int(say-ystep));
esy1.push_back(int(say+ystep));
esy0.push_back(int(say-ystep));
esy1.push_back(int(say+ystep));
if(esy0[y] == esy1[y]) {
ey0.push_back(1.f);
} else {
int ydist = esy1[y] - esy0[y];
float ftop = esy0[y] + .5f;
float p = (say - ftop) / ydist;
ey0.push_back(1-p);
}
if(esy0[y] == esy1[y]) {
ey0.push_back(1.f);
} else {
int ydist = esy1[y] - esy0[y];
float ftop = esy0[y] + .5f;
float p = (say - ftop) / ydist;
ey0.push_back(1-p);
}
}
tColorRGBA *sp = (tColorRGBA *) src->pixels;
/* Scan destination */
for (y = 0; y < dst->h; y++) {
tColorRGBA *dp = (tColorRGBA *) ((Uint8 *) dst->pixels + dst->pitch*y);
/* current source pointer and next source pointer (first and second
* rows sampled for this row): */
tColorRGBA *csp = (tColorRGBA *) ((Uint8 *) sp + esy0[y] * src->pitch);
tColorRGBA *ncsp = (tColorRGBA *) ((Uint8 *) sp + esy1[y] * src->pitch);
tColorRGBA *dp = (tColorRGBA *) ((Uint8 *) dst->pixels + dst->pitch*y);
/* current source pointer and next source pointer (first and second
* rows sampled for this row): */
tColorRGBA *csp = (tColorRGBA *) ((Uint8 *) sp + esy0[y] * src->pitch);
tColorRGBA *ncsp = (tColorRGBA *) ((Uint8 *) sp + esy1[y] * src->pitch);
for (x = 0; x < dst->w; x++) {
/* Grab pointers to the sampled pixels: */
tColorRGBA *c00 = csp + esx0[x];
tColorRGBA *c01 = csp + esx1[x];
tColorRGBA *c10 = ncsp + esx0[x];
tColorRGBA *c11 = ncsp + esx1[x];
for (x = 0; x < dst->w; x++) {
/* Grab pointers to the sampled pixels: */
tColorRGBA *c00 = csp + esx0[x];
tColorRGBA *c01 = csp + esx1[x];
tColorRGBA *c10 = ncsp + esx0[x];
tColorRGBA *c11 = ncsp + esx1[x];
for(int c = 0; c < 4; ++c) {
float x0, x1;
x0 = c00->c[c] * ex0[x];
x0 += c01->c[c] * (1-ex0[x]);
x1 = c10->c[c] * ex0[x];
x1 += c11->c[c] * (1-ex0[x]);
for(int c = 0; c < 4; ++c) {
float x0, x1;
x0 = c00->c[c] * ex0[x];
x0 += c01->c[c] * (1-ex0[x]);
x1 = c10->c[c] * ex0[x];
x1 += c11->c[c] * (1-ex0[x]);
float res = (x0 * ey0[y]) + (x1 * (1-ey0[y]));
dp->c[c] = Uint8(res);
}
float res = (x0 * ey0[y]) + (x1 * (1-ey0[y]));
dp->c[c] = Uint8(res);
}
/* Advance destination pointer. */
dp++;
}
/* Advance destination pointer. */
dp++;
}
}
}