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{
if (!(dx == 0 || dy == 0)) {
PIXEL_TYPE* aDestPixels = &aBits[aY0*STRIDE + aX0];
uint32_t anErrAcc = 0x10000 - (uint32_t)((1.0f - fabsf(theStartX - aX0))*(1.0f - fabsf(theStartY - aY0)) * 0x10000);
if (dx >= dy) // mostly horizontal
{
//uint32_t anErrAdj = (((uint32_t)dy << 16) / (uint32_t)dx);
uint32_t anErrAdj = (uint32_t)(dyd / dxd * 0x10000);
uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
uchar aWeight2 = (aWeight ^ 0xFF);
int a = CALC_WEIGHT_A(aWeight);
PIXEL_TYPE dest = *aDestPixels;
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels);
}
while (--dx)
{
anErrAcc += anErrAdj;
if (anErrAcc >= 0x10000)
{
anErrAcc &= 0xFFFF;
aDestPixels += STRIDE;
aY0++;
}
aDestPixels += aXinc;
uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
uchar aWeight2 = (aWeight ^ 0xFF);
dest = *aDestPixels;
a = CALC_WEIGHT_A(aWeight);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels);
}
if (aY0 < mHeight-1)
{
dest = *(aDestPixels+STRIDE);
a = CALC_WEIGHT_A(aWeight2);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels+STRIDE);
}
}
}
}
else // mostly vertical
{
//uint32_t anErrAdj = (uint32_t)(((uint32_t)dx << 16) / (uint32_t)dy);
uint32_t anErrAdj = (uint32_t)(dxd / dyd * 0x10000);
uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
uchar aWeight2 = (aWeight ^ 0xFF);
PIXEL_TYPE dest = *aDestPixels;
int a = CALC_WEIGHT_A(aWeight);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels);
}
while (--dy)
{
anErrAcc += anErrAdj;
if (anErrAcc >= 0x10000)
{
anErrAcc &= 0xFFFF;
aDestPixels += aXinc;
aX0 += aXinc;
}
aDestPixels += STRIDE;
uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
uchar aWeight2 = (aWeight ^ 0xFF);
dest = *aDestPixels;
int a = CALC_WEIGHT_A(aWeight);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels);
}
if (aX0 < STRIDE-1)
{
dest = *(aDestPixels+aXinc);
a = CALC_WEIGHT_A(aWeight2);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels+aXinc);
}
}
}
}
aDestPixels = &aBits[aY1*STRIDE + aX1];
uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
uchar aWeight2 = (aWeight ^ 0xFF);
PIXEL_TYPE dest = *aDestPixels;
int a = CALC_WEIGHT_A(aWeight);
if (a != 0) {
int oma = 256 - a;
BLEND_PIXEL(aDestPixels);
}
}
}
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