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fix Surface_to_bytefield()

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Each line of the SDL surface use "pitch" bytes.
see https://pulkomandy.tk/projects/GrafX2/ticket/171
This commit is contained in:
Thomas Bernard 2022-10-07 00:54:22 +02:00 committed by Adrien Destugues
parent bb5a9e1fea
commit 7e5daa65a8
1 changed files with 1 additions and 7 deletions
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8
src/sdlscreen.c
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@ -373,17 +373,11 @@ byte * Surface_to_bytefield(SDL_Surface *source, byte * dest)
byte *src; byte *src;
byte *dest_ptr; byte *dest_ptr;
int y; int y;
int remainder;
// Support seulement des images 256 couleurs // Support seulement des images 256 couleurs
if (source->format->BytesPerPixel != 1) if (source->format->BytesPerPixel != 1)
return NULL; return NULL;
if (source->w & 3)
remainder=4-(source->w&3);
else
remainder=0;
if (dest==NULL) if (dest==NULL)
dest=(byte *)malloc(source->w*source->h); dest=(byte *)malloc(source->w*source->h);
@ -393,7 +387,7 @@ byte * Surface_to_bytefield(SDL_Surface *source, byte * dest)
{ {
memcpy(dest_ptr, src,source->w); memcpy(dest_ptr, src,source->w);
dest_ptr += source->w; dest_ptr += source->w;
src += source->w + remainder; src += source->pitch;
} }
return dest; return dest;