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Fix crash in drivers with NULL gfxdecode entries (nw)

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This commit is contained in:
Alex W. Jackson 2014-02-17 03:56:08 +00:00
parent 4c8f8d9238
commit f4e705346e
1 changed files with 17 additions and 5 deletions
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22
src/emu/drawgfx.c
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@ -114,12 +114,24 @@ void gfxdecode_device::device_start()
for (curgfx = 0; curgfx < MAX_GFX_ELEMENTS && gfxdecodeinfo[curgfx].gfxlayout != NULL; curgfx++)
{
const gfx_decode_entry *gfxdecode = &gfxdecodeinfo[curgfx];
UINT32 region_length;
const UINT8 *region_base;
// resolve the region
astring gfxregion;
owner()->subtag(gfxregion, gfxdecode->memory_region);
memory_region *region = (gfxdecode->memory_region != NULL) ? owner()->memregion(gfxregion) : NULL;
UINT32 region_length = (region != NULL) ? (8 * region->bytes()) : 0;
const UINT8 *region_base = (region != NULL) ? region->base() : NULL;
if (gfxdecode->memory_region != NULL)
{
astring gfxregion;
owner()->subtag(gfxregion, gfxdecode->memory_region);
memory_region *region = owner()->memregion(gfxregion);
region_length = 8 * region->bytes();
region_base = region->base();
}
else
{
region_length = 0;
region_base = NULL;
}
UINT32 xscale = (gfxdecode->xscale == 0) ? 1 : gfxdecode->xscale;
UINT32 yscale = (gfxdecode->yscale == 0) ? 1 : gfxdecode->yscale;
UINT32 *extpoffs, extxoffs[MAX_ABS_GFX_SIZE], extyoffs[MAX_ABS_GFX_SIZE];