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Software nearest scaling: start at the middle of pixel 

so that it matches opengl GL_NEAREST mode most of the time
This commit is contained in:
Sylvain 2021-03-04 14:33:56 +01:00
parent ac8a3fda8f
commit ab0cf42a4b
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GPG Key ID: 5F87E02E5BC0939E
3 changed files with 6 additions and 6 deletions
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4
src/video/SDL_blit_slow.c
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@ -49,15 +49,15 @@ SDL_Blit_Slow(SDL_BlitInfo * info)
Uint32 rgbmask = ~src_fmt->Amask;
Uint32 ckey = info->colorkey & rgbmask;
posy = 0;
incy = (info->src_h << 16) / info->dst_h;
incx = (info->src_w << 16) / info->dst_w;
posy = incy / 2; /* start at the middle of pixel */
while (info->dst_h--) {
Uint8 *src = 0;
Uint8 *dst = info->dst;
int n = info->dst_w;
posx = 0;
posx = incx / 2; /* start at the middle of pixel */
srcy = posy >> 16;
while (n--) {
srcx = posx >> 16;

4
src/video/SDL_stretch.c
View File

@ -857,13 +857,13 @@ SDL_LowerSoftStretchLinear(SDL_Surface *s, const SDL_Rect *srcrect,
incy = (src_h << 16) / dst_h; \
incx = (src_w << 16) / dst_w; \
dst_gap = dst_pitch - bpp * dst_w; \
posy = 0; \
posy = incy / 2; \
#define SDL_SCALE_NEAREST__HEIGHT \
srcy = (posy >> 16); \
src_h0 = (const Uint32 *)((const Uint8 *)src_ptr + srcy * src_pitch); \
posy += incy; \
posx = 0; \
posx = incx / 2; \
n = dst_w;

4
src/video/sdlgenblit.pl
View File

@ -458,15 +458,15 @@ __EOF__
print FILE <<__EOF__;
posy = 0;
incy = (info->src_h << 16) / info->dst_h;
incx = (info->src_w << 16) / info->dst_w;
posy = incy / 2;
while (info->dst_h--) {
$format_type{$src} *src = 0;
$format_type{$dst} *dst = ($format_type{$dst} *)info->dst;
int n = info->dst_w;
posx = 0;
posx = incx / 2;
srcy = posy >> 16;
while (n--) {