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#include <string.h>
#include <stdint.h>
extern int pixel_fmt;
#ifndef UNROLL
void fcn_00451801(int16_t *a, int nbytes)
#else
void fcn_00451801_no_unroll(int16_t *a, int nbytes)
#endif
{
int nw = nbytes >> 1;
switch (pixel_fmt) {
case 1:
for (int i = 0; i < nw; i++) {
uint16_t t = a[i];
uint16_t t2 = t * 2;
t &= 0x001f; /* t[0:4] */
t2 &= 0xffc0; /* t2[6:15] = t[5:14] */
a[i] = t | t2; /* t[0:4],0,t[5:14] */
}
return;
case 2:
for (int i = 0; i < nw; i++) {
uint16_t t = a[i];
uint16_t v1 = (t & 0x7c00) >> 10; /* v1[0:4] = t[10:14] */
uint16_t v2 = (t & 0x03e0) << 1; /* v2[6:10] = t[5:9] */
uint16_t v3 = (t & 0x001f) << 11; /* v3[11:15] = t[0:4] */
a[i] = v1 | v2 | v3; /* t[10:14],0,t[5:9],t[0:4] */
}
return;
case 3:
for (int i = 0; i < nw; i++) {
uint16_t t = a[i];
uint16_t v1 = (t & 0x7800) >> 3; /* v1[8:11] = t[11:14] */
uint16_t v2 = (t & 0x03c0) >> 2; /* v2[4:7] = t[6:9] */
uint16_t v3 = (t & 0x001e) >> 1; /* v3[0:3] = t[1:4] */
a[i] = v1 | v2 | v3; /* t[1:4],t[6:9],t[11:14] */
}
return;
default:
return;
}
}
#if 0
void fcn_00451801(int16_t *a1, int nbytes)
{
int t; /* esp + 8 */
int s; /* esp */
int u; /* esp + 4 */
uint32_t *edi = a1;
uint32_t *edx;
esi = nbytes;
t = (nbytes >> 1) & 1;
esi >>= 2;
eax = dw_47637c;
switch (eax) {
case 1:
for (eax = 0; eax < esi; eax++) {
edx = &edi[eax];
ecx = *edx;
ebx = ecx*2;
ecx &= 0x001f001f;
ebx &= 0xffc0ffc0;
*edx = ecx | ebx;
}
if (t == 0)
return;
eax = 0;
ax = *(int16_t*)edx;
ecx = eax * 2;
eax &= 0x1f;
ecx &= 0xffc0;
*(uint16_t*)edx = (uint16_t)(eax | ecx);
return;
case 2:
for (eax = 0; eax < esi; eax++) {
edx = &edi[eax];
ecx = *edx;
s = (ecx & 0x7c007c00) >> 10;
u = (ecx & 0x03e003e0) * 2;
ebx = (ecx & 0x001f001f) << 11;
ecx = s | u | ebx;
*edx = ecx;
}
if (t == 0)
return;
eax = 0;
ax = *(uint16_t*)edx;
s = (eax & 0x7c00) >> 10;
u = (eax & 0x03e0) * 2;
eax = (eax & 0x001f) << 11;
*(uint16_t)edx = (uint16_t)(eax | s | u);
return;
case 3:
for (eax = 0; eax < esi; eax++) {
edx = &edi[eax];
ecx = *edx;
ebx = (ecx & 0x78007800) >> 3;
ebp = (ecx & 0x03c003c0) >> 2;
ecx = (ecx & 0x001e001e) >> 1;
*edx = ecx | ebx | ebp;
}
if (s==0)
return;
eax = 0;
ax = *(uint16_t*)edx;
s = (eax & 0x7800) >> 3;
u = (eax & 0x03c0) >> 2;
ecx = (eax & 0x001e) >> 1;
*(uint16_t*)edx = (uint16_t)(s | u | ecx);
return;
default:
return;
}
}
#endif
struct spr_smp
{
char sig[4]; /* "SPR" or "SMP" */
int t1;
int t2;
int t3, t4; /* unused? */
struct {
int v1;
int v2, v3; /* unused? */
} t[0];
};
void fcn_00450069(char *s)
{
struct spr_smp *sst = (struct spr_smp*)s;
if (strcmp(sst->sig, "SPR") == 0) {
int oldv = sst->t[0].v1;
sst->t[0].v1 = (int32_t)s + sst->t2 + 0x200;
for (int i = 1; i < sst->t1; i++) {
int t = sst->t[i].v1;
/* sum of old and new values of sst->t[i-1] */
sst->t[i].v1 = oldv + sst->t[i-1].v1;
oldv = t;
}
}
if (strcmp(sst->sig, "SMP") == 0) {
int oldv = sst->t[0].v1; // oldv@esi
sst->t[0].v1 = (int32_t)s + sst->t2;
for (int i = 1; i < sst->t1; i++) {
int t = sst->t[i].v1;
sst->t[i].v1 = oldv + sst->t[i-1].v1;
oldv = t;
}
}
}
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