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#include <stdio.h>
#include <stdint.h>
#include "scaler.h"
#define AVERAGE(z, x) ((((z) & 0xF7DEF7DE) >> 1) + (((x) & 0xF7DEF7DE) >> 1))
#define AVERAGEHI(AB) ((((AB) & 0xF7DE0000) >> 1) + (((AB) & 0xF7DE) << 15))
#define AVERAGELO(CD) ((((CD) & 0xF7DE) >> 1) + (((CD) & 0xF7DE0000) >> 17))
// Support math
#define Half(A) (((A) >> 1) & 0x7BEF)
#define Quarter(A) (((A) >> 2) & 0x39E7)
// Error correction expressions to piece back the lower bits together
#define RestHalf(A) ((A) & 0x0821)
#define RestQuarter(A) ((A) & 0x1863)
// Error correction expressions for quarters of pixels
#define Corr1_3(A, B) Quarter(RestQuarter(A) + (RestHalf(B) << 1) + RestQuarter(B))
#define Corr3_1(A, B) Quarter((RestHalf(A) << 1) + RestQuarter(A) + RestQuarter(B))
// Error correction expressions for halves
#define Corr1_1(A, B) ((A) & (B) & 0x0821)
// Quarters
#define Weight1_3(A, B) (Quarter(A) + Half(B) + Quarter(B) + Corr1_3(A, B))
#define Weight3_1(A, B) (Half(A) + Quarter(A) + Quarter(B) + Corr3_1(A, B))
// Halves
#define Weight1_1(A, B) (Half(A) + Half(B) + Corr1_1(A, B))
void upscale_256x240_to_320x240_bilinearish(uint32_t* restrict dst, uint32_t* restrict src, uint_fast16_t width, uint_fast16_t height)
{
uint16_t* Src16 = (uint16_t*) src;
uint16_t* Dst16 = (uint16_t*) dst;
// There are 64 blocks of 4 pixels horizontally, and 239 of 1 vertically.
// Each block of 4x1 becomes 5x1.
uint32_t BlockX, BlockY;
uint16_t* BlockSrc;
uint16_t* BlockDst;
for (BlockY = 0; BlockY < height; BlockY++)
{
BlockSrc = Src16 + BlockY * width * 1;
BlockDst = Dst16 + BlockY * 320 * 1;
for (BlockX = 0; BlockX < 64; BlockX++)
{
/* Horizontally:
* Before(4):
* (a)(b)(c)(d)
* After(5):
* (a)(abbb)(bc)(cccd)(d)
*/
// -- Row 1 --
uint16_t _1 = *(BlockSrc );
*(BlockDst ) = _1;
uint16_t _2 = *(BlockSrc + 1);
*(BlockDst + 1) = Weight1_3( _1, _2);
uint16_t _3 = *(BlockSrc + 2);
*(BlockDst + 2) = Weight1_1( _2, _3);
uint16_t _4 = *(BlockSrc + 3);
*(BlockDst + 3) = Weight3_1( _3, _4);
*(BlockDst + 4) = _4;
BlockSrc += 4;
BlockDst += 5;
}
}
}
void upscale_256xXXX_to_320x240(uint32_t* restrict dst, uint32_t* restrict src, uint_fast16_t width, uint_fast16_t height)
{
uint32_t midh = 240 / 2;
uint32_t Eh = 0;
uint32_t source;
uint32_t dh = 0;
uint32_t y, x;
for (y = 0; y < 240; y++)
{
source = dh * width / 2;
for (x = 0; x < 320/10; x++)
{
register uint32_t ab, cd, ef, gh;
__builtin_prefetch(dst + 4, 1);
__builtin_prefetch(src + source + 4, 0);
ab = src[source] & 0xF7DEF7DE;
cd = src[source + 1] & 0xF7DEF7DE;
ef = src[source + 2] & 0xF7DEF7DE;
gh = src[source + 3] & 0xF7DEF7DE;
if(Eh >= midh) {
ab = AVERAGE(ab, src[source + width/2]) & 0xF7DEF7DE; // to prevent overflow
cd = AVERAGE(cd, src[source + width/2 + 1]) & 0xF7DEF7DE; // to prevent overflow
ef = AVERAGE(ef, src[source + width/2 + 2]) & 0xF7DEF7DE; // to prevent overflow
gh = AVERAGE(gh, src[source + width/2 + 3]) & 0xF7DEF7DE; // to prevent overflow
}
*dst++ = ab;
*dst++ = ((ab >> 17) + ((cd & 0xFFFF) >> 1)) + (cd << 16);
*dst++ = (cd >> 16) + (ef << 16);
*dst++ = (ef >> 16) + (((ef & 0xFFFF0000) >> 1) + ((gh & 0xFFFF) << 15));
*dst++ = gh;
source += 4;
}
Eh += height; if(Eh >= 240) { Eh -= 240; dh++; }
}
}
/* alekmaul's scaler taken from mame4all */
void bitmap_scale(uint32_t startx, uint32_t starty, uint32_t viswidth, uint32_t visheight, uint32_t newwidth, uint32_t newheight,uint32_t pitchsrc,uint32_t pitchdest, uint16_t* restrict src, uint16_t* restrict dst)
{
uint32_t W,H,ix,iy,x,y;
x=startx<<16;
y=starty<<16;
W=newwidth;
H=newheight;
ix=(viswidth<<16)/W;
iy=(visheight<<16)/H;
do
{
uint16_t* restrict buffer_mem=&src[(y>>16)*pitchsrc];
W=newwidth; x=startx<<16;
do
{
*dst++=buffer_mem[x>>16];
x+=ix;
} while (--W);
dst+=pitchdest;
y+=iy;
} while (--H);
}
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