encounter
/
SDL
mirror of https://github.com/encounter/SDL.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Software Render Jitter in rotation (bug #5143) 

The output surface doesn't necessarily to have even width and height.
This commit is contained in:
Sylvain 2022-02-15 13:35:59 +01:00
parent 61abc4e5b6
commit 75ffa24e3a
No known key found for this signature in database
GPG Key ID: 5F87E02E5BC0939E
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/render/software/SDL_rotate.c
View File

@ -128,26 +128,26 @@ SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle,
} else {
double x, y, cx, cy, sx, sy;
double radangle;
int dstwidthhalf, dstheighthalf;
double dstwidth_max, dstheight_max;
/*
* Determine destination width and height by rotating a centered source box
*/
radangle = angle * (M_PI / -180.0); /* reverse the angle because our rotations are clockwise */
*sangle = SDL_sin(radangle);
*cangle = SDL_cos(radangle);
x = (double)(width / 2);
y = (double)(height / 2);
x = (double)width;
y = (double)height;
cx = *cangle * x;
cy = *cangle * y;
sx = *sangle * x;
sy = *sangle * y;
dstwidthhalf = MAX((int)
SDL_ceil(MAX(MAX(MAX(SDL_fabs(cx + sy), SDL_fabs(cx - sy)), SDL_fabs(-cx + sy)), SDL_fabs(-cx - sy))), 1);
dstheighthalf = MAX((int)
SDL_ceil(MAX(MAX(MAX(SDL_fabs(sx + cy), SDL_fabs(sx - cy)), SDL_fabs(-sx + cy)), SDL_fabs(-sx - cy))), 1);
*dstwidth = 2 * dstwidthhalf;
*dstheight = 2 * dstheighthalf;
dstwidth_max = MAX(
MAX(MAX(MAX(SDL_fabs(cx + sy), SDL_fabs(cx - sy)), SDL_fabs(-cx + sy)), SDL_fabs(-cx - sy)), 1);
dstheight_max = MAX(
MAX(MAX(MAX(SDL_fabs(sx + cy), SDL_fabs(sx - cy)), SDL_fabs(-sx + cy)), SDL_fabs(-sx - cy)), 1);
*dstwidth = SDL_round(dstwidth_max);
*dstheight = SDL_round(dstheight_max);
}
}