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// license:BSD-3-Clause
// copyright-holders:S. Smith,David Haywood
#include "emu.h"
#include "neogeo_helper.h"
static uint32_t get_region_mask(uint8_t* rgn, uint32_t rgn_size)
{
uint32_t mask;
uint32_t len;
uint32_t bit;
mask = 0xffffffff;
len = rgn_size;
for (bit = 0x80000000; bit != 0; bit >>= 1)
{
if ((len * 2 - 1) & bit)
break;
mask >>= 1;
}
return mask;
}
uint32_t neogeohelper_optimize_sprite_data(std::vector<uint8_t> &spritegfx, uint8_t* region_sprites, uint32_t region_sprites_size)
{
/* convert the sprite graphics data into a format that
allows faster blitting */
uint8_t *src;
uint8_t *dest;
uint32_t mask = get_region_mask(region_sprites, region_sprites_size);
spritegfx.resize(mask + 1);
uint32_t spritegfx_address_mask = mask;
src = region_sprites;
dest = &spritegfx[0];
for (unsigned i = 0; i < region_sprites_size; i += 0x80, src += 0x80)
{
for (unsigned y = 0; y < 0x10; y++)
{
for (unsigned x = 0; x < 8; x++)
{
*(dest++) = (((src[0x43 | (y << 2)] >> x) & 0x01) << 3) |
(((src[0x41 | (y << 2)] >> x) & 0x01) << 2) |
(((src[0x42 | (y << 2)] >> x) & 0x01) << 1) |
(((src[0x40 | (y << 2)] >> x) & 0x01) << 0);
}
for (unsigned x = 0; x < 8; x++)
{
*(dest++) = (((src[0x03 | (y << 2)] >> x) & 0x01) << 3) |
(((src[0x01 | (y << 2)] >> x) & 0x01) << 2) |
(((src[0x02 | (y << 2)] >> x) & 0x01) << 1) |
(((src[0x00 | (y << 2)] >> x) & 0x01) << 0);
}
}
}
return spritegfx_address_mask;
}
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