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Fixed crash scaling very large surfaces

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Fixes https://github.com/libsdl-org/SDL/issues/8878

(cherry picked from commit 09ba55b462b826070482a586b72906fae4a66b32)
This commit is contained in:
Sam Lantinga 2024-01-19 13:06:12 -08:00
parent 910e040e9e
commit f7ab765b84
4 changed files with 387 additions and 386 deletions
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720
src/video/SDL_blit_auto.c
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File diff suppressed because it is too large Load diff

10
src/video/SDL_blit_slow.c
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@ -54,9 +54,9 @@ void SDL_Blit_Slow(SDL_BlitInfo *info)
Uint32 srcR, srcG, srcB, srcA;
Uint32 dstpixel;
Uint32 dstR, dstG, dstB, dstA;
int srcy, srcx;
Uint32 posy, posx;
int incy, incx;
Uint64 srcy, srcx;
Uint64 posy, posx;
Uint64 incy, incx;
SDL_PixelFormat *src_fmt = info->src_fmt;
SDL_PixelFormat *dst_fmt = info->dst_fmt;
int srcbpp = src_fmt->BytesPerPixel;
@ -69,8 +69,8 @@ void SDL_Blit_Slow(SDL_BlitInfo *info)
srcfmt_val = detect_format(src_fmt);
dstfmt_val = detect_format(dst_fmt);
incy = (info->src_h << 16) / info->dst_h;
incx = (info->src_w << 16) / info->dst_w;
incy = ((Uint64)info->src_h << 16) / info->dst_h;
incx = ((Uint64)info->src_w << 16) / info->dst_w;
posy = incy / 2; /* start at the middle of pixel */
while (info->dst_h--) {

33
src/video/SDL_stretch.c
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@ -163,7 +163,8 @@ static int SDL_UpperSoftStretch(SDL_Surface *src, const SDL_Rect *srcrect,
#define BILINEAR___HEIGHT \
int index_h, frac_h0, frac_h1, middle; \
const Uint32 *src_h0, *src_h1; \
int no_padding, incr_h0, incr_h1; \
int no_padding; \
Uint64 incr_h0, incr_h1; \
\
no_padding = !(i < left_pad_h || i > dst_h - 1 - right_pad_h); \
index_h = SRC_INDEX(fp_sum_h); \
@ -172,7 +173,7 @@ static int SDL_UpperSoftStretch(SDL_Surface *src, const SDL_Rect *srcrect,
index_h = no_padding ? index_h : (i < left_pad_h ? 0 : src_h - 1); \
frac_h0 = no_padding ? frac_h0 : 0; \
incr_h1 = no_padding ? src_pitch : 0; \
incr_h0 = index_h * src_pitch; \
incr_h0 = (Uint64)index_h * src_pitch; \
\
src_h0 = (const Uint32 *)((const Uint8 *)src + incr_h0); \
src_h1 = (const Uint32 *)((const Uint8 *)src_h0 + incr_h1); \
@ -824,16 +825,16 @@ int SDL_LowerSoftStretchLinear(SDL_Surface *s, const SDL_Rect *srcrect,
return ret;
}
#define SDL_SCALE_NEAREST__START \
int i; \
Uint32 posy, incy; \
Uint32 posx, incx; \
int dst_gap; \
int srcy, n; \
const Uint32 *src_h0; \
incy = (src_h << 16) / dst_h; \
incx = (src_w << 16) / dst_w; \
dst_gap = dst_pitch - bpp * dst_w; \
#define SDL_SCALE_NEAREST__START \
int i; \
Uint64 posy, incy; \
Uint64 posx, incx; \
Uint64 srcy, srcx; \
int dst_gap, n; \
const Uint32 *src_h0; \
incy = ((Uint64)src_h << 16) / dst_h; \
incx = ((Uint64)src_w << 16) / dst_w; \
dst_gap = dst_pitch - bpp * dst_w; \
posy = incy / 2;
#define SDL_SCALE_NEAREST__HEIGHT \
@ -852,7 +853,7 @@ static int scale_mat_nearest_1(const Uint32 *src_ptr, int src_w, int src_h, int
SDL_SCALE_NEAREST__HEIGHT
while (n--) {
const Uint8 *src;
int srcx = bpp * (posx >> 16);
srcx = bpp * (posx >> 16);
posx += incx;
src = (const Uint8 *)src_h0 + srcx;
*(Uint8 *)dst = *src;
@ -872,7 +873,7 @@ static int scale_mat_nearest_2(const Uint32 *src_ptr, int src_w, int src_h, int
SDL_SCALE_NEAREST__HEIGHT
while (n--) {
const Uint16 *src;
int srcx = bpp * (posx >> 16);
srcx = bpp * (posx >> 16);
posx += incx;
src = (const Uint16 *)((const Uint8 *)src_h0 + srcx);
*(Uint16 *)dst = *src;
@ -892,7 +893,7 @@ static int scale_mat_nearest_3(const Uint32 *src_ptr, int src_w, int src_h, int
SDL_SCALE_NEAREST__HEIGHT
while (n--) {
const Uint8 *src;
int srcx = bpp * (posx >> 16);
srcx = bpp * (posx >> 16);
posx += incx;
src = (const Uint8 *)src_h0 + srcx;
((Uint8 *)dst)[0] = src[0];
@ -914,7 +915,7 @@ static int scale_mat_nearest_4(const Uint32 *src_ptr, int src_w, int src_h, int
SDL_SCALE_NEAREST__HEIGHT
while (n--) {
const Uint32 *src;
int srcx = bpp * (posx >> 16);
srcx = bpp * (posx >> 16);
posx += incx;
src = (const Uint32 *)((const Uint8 *)src_h0 + srcx);
*dst = *src;

10
src/video/sdlgenblit.pl
View file

@ -518,15 +518,15 @@ __EOF__
}
if ( $scale ) {
print FILE <<__EOF__;
int srcy, srcx;
Uint32 posy, posx;
int incy, incx;
Uint64 srcy, srcx;
Uint64 posy, posx;
Uint64 incy, incx;
__EOF__
print FILE <<__EOF__;
incy = (info->src_h << 16) / info->dst_h;
incx = (info->src_w << 16) / info->dst_w;
incy = ((Uint64)info->src_h << 16) / info->dst_h;
incx = ((Uint64)info->src_w << 16) / info->dst_w;
posy = incy / 2;
while (info->dst_h--) {