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tweak blt_stretch

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This commit is contained in:
FunkyFr3sh 2022-09-13 16:08:46 +02:00
parent d09e2a3dbf
commit fe60c7910a
1 changed files with 15 additions and 12 deletions
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27
src/blt.c
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@ -550,27 +550,30 @@ void blt_stretch(
if (bpp == 8) if (bpp == 8)
{ {
unsigned char* d = (unsigned char*)dst;
unsigned char* s = (unsigned char*)src;
for (int y = 0; y < dst_h; y++) for (int y = 0; y < dst_h; y++)
{ {
int scaled_y = (int)(y * scale_h); int scaled_y = (int)(y * scale_h);
int dst_row = dst_surf_w * (y + dst_y); int dst_row = dst_x + dst_surf_w * (y + dst_y);
if (scaled_y == last_y) if (scaled_y == last_y)
{ {
memcpy(&dst[dst_x + dst_row], &dst[dst_x + last_row], size); memcpy(&d[dst_row], &d[last_row], size);
continue; continue;
} }
last_y = scaled_y; last_y = scaled_y;
last_row = dst_row; last_row = dst_row;
int src_row = src_surf_w * (scaled_y + src_y); int src_row = src_x + src_surf_w * (scaled_y + src_y);
for (int x = 0; x < dst_w; x++) for (int x = 0; x < dst_w; x++)
{ {
int scaled_x = (int)(x * scale_w); int scaled_x = (int)(x * scale_w);
dst[x + dst_x + dst_row] = src[scaled_x + src_x + src_row]; d[x + dst_row] = s[scaled_x + src_row];
} }
} }
} }
@ -582,24 +585,24 @@ void blt_stretch(
for (int y = 0; y < dst_h; y++) for (int y = 0; y < dst_h; y++)
{ {
int scaled_y = (int)(y * scale_h); int scaled_y = (int)(y * scale_h);
int dst_row = dst_surf_w * (y + dst_y); int dst_row = dst_x + dst_surf_w * (y + dst_y);
if (scaled_y == last_y) if (scaled_y == last_y)
{ {
memcpy(&d[dst_x + dst_row], &d[dst_x + last_row], size); memcpy(&d[dst_row], &d[last_row], size);
continue; continue;
} }
last_y = scaled_y; last_y = scaled_y;
last_row = dst_row; last_row = dst_row;
int src_row = src_surf_w * (scaled_y + src_y); int src_row = src_x + src_surf_w * (scaled_y + src_y);
for (int x = 0; x < dst_w; x++) for (int x = 0; x < dst_w; x++)
{ {
int scaled_x = (int)(x * scale_w); int scaled_x = (int)(x * scale_w);
d[x + dst_x + dst_row] = s[scaled_x + src_x + src_row]; d[x + dst_row] = s[scaled_x + src_row];
} }
} }
} }
@ -611,24 +614,24 @@ void blt_stretch(
for (int y = 0; y < dst_h; y++) for (int y = 0; y < dst_h; y++)
{ {
int scaled_y = (int)(y * scale_h); int scaled_y = (int)(y * scale_h);
int dst_row = dst_surf_w * (y + dst_y); int dst_row = dst_x + dst_surf_w * (y + dst_y);
if (scaled_y == last_y) if (scaled_y == last_y)
{ {
memcpy(&d[dst_x + dst_row], &d[dst_x + last_row], size); memcpy(&d[dst_row], &d[last_row], size);
continue; continue;
} }
last_y = scaled_y; last_y = scaled_y;
last_row = dst_row; last_row = dst_row;
int src_row = src_surf_w * (scaled_y + src_y); int src_row = src_x + src_surf_w * (scaled_y + src_y);
for (int x = 0; x < dst_w; x++) for (int x = 0; x < dst_w; x++)
{ {
int scaled_x = (int)(x * scale_w); int scaled_x = (int)(x * scale_w);
d[x + dst_x + dst_row] = s[scaled_x + src_x + src_row]; d[x + dst_row] = s[scaled_x + src_row];
} }
} }
} }