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#include "native.h"
#include "endianutils.h"
#define MAIN_TYPE FastShrinkType
#include "macros.h"
UInt32 Screen_fastShrink(void *userData68KP) {
// import variables
SETPTR (UInt8 * ,src );
SET32 (UInt32, width );
SET32 (UInt32, height );
SET32 (uint32, scale );
SETPTR (UInt8 * ,dest );
// end of import
uint32 resHeight = (height * scale) >> 8;
uint32 resWidth = (width * scale) >> 8;
uint32 step = 0x10000 / scale;
uint8 columnTab[160];
uint32 res = step >> 1;
for (uint16 cnt = 0; cnt < resWidth; cnt++) {
columnTab[cnt] = (uint8)(res >> 8);
res += step;
}
uint32 newRow = step >> 1;
uint32 oldRow = 0;
uint8 *destPos = dest;
uint16 lnCnt;
for (lnCnt = 0; lnCnt < resHeight; lnCnt++) {
while (oldRow < (newRow >> 8)) {
oldRow++;
src += width;
}
for (uint16 colCnt = 0; colCnt < resWidth; colCnt++) {
*destPos++ = src[columnTab[colCnt]];
}
newRow += step;
}
// scaled, now stipple shadows if there are any
for (lnCnt = 0; lnCnt < resHeight; lnCnt++) {
uint16 xCnt = lnCnt & 1;
destPos = dest + lnCnt * resWidth + (lnCnt & 1);
while (xCnt < resWidth) {
if (*destPos == 200)
*destPos = 0;
destPos += 2;
xCnt += 2;
}
}
return 0;
}
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