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alignment attempt 2. this seems right, but doesn't work even for previously-working images

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This commit is contained in:
Chris Young 2012-08-10 19:03:56 +01:00
parent 3ed1339b3f
commit ad1336ac45
1 changed files with 7 additions and 5 deletions
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10
amiga/bitmap.c
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@ -481,14 +481,16 @@ PLANEPTR ami_bitmap_get_mask(struct bitmap *bitmap, int width, int height)
{
uint32 *bmi = (uint32 *) bitmap->pixdata;
UBYTE maskbit = 0;
int y, x;
int y, x, w;
if((height != bitmap->height) || (width != bitmap->width)) return NULL;
if(bitmap_get_opaque(bitmap) == true) return NULL;
if(bitmap->native_mask) return bitmap->native_mask;
bitmap->native_mask = AllocRaster(width, height);
while((width % 8) != 0) width++;
w = width / 8;
if((width % 8) != 0) w++;
for(int i=0; i<(height * (width / 8)); i++) {
bitmap->native_mask[i] = 0;
@ -499,8 +501,8 @@ PLANEPTR ami_bitmap_get_mask(struct bitmap *bitmap, int width, int height)
if ((*bmi & 0x000000ffU) <= (ULONG)nsoption_int(mask_alpha)) maskbit = 0;
else maskbit = 1;
bmi++;
bitmap->native_mask[(y*(width/8)) + (x/8)] =
(bitmap->native_mask[(y*(width/8)) + (x/8)] << 1) | maskbit;
bitmap->native_mask[(y*w) + (x/8)] =
(bitmap->native_mask[(y*w) + (x/8)] << 1) | maskbit;
}
}