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Created July 17, 2013 21:10
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Linear 2x Scaler written by [md5]
// Taken from SCI
void scale2x(const byte *src, byte *dst, int16 srcWidth, int16 srcHeight, byte bytesPerPixel) {
assert(bytesPerPixel == 1 || bytesPerPixel == 2);
const int newWidth = srcWidth * 2;
const int pitch = newWidth * bytesPerPixel;
const byte *srcPtr = src;
if (bytesPerPixel == 1) {
for (int y = 0; y < srcHeight; y++) {
for (int x = 0; x < srcWidth; x++) {
const byte color = *srcPtr++;
dst[0] = color;
dst[1] = color;
dst[newWidth] = color;
dst[newWidth + 1] = color;
dst += 2;
}
dst += newWidth;
}
} else if (bytesPerPixel == 2) {
for (int y = 0; y < srcHeight; y++) {
for (int x = 0; x < srcWidth; x++) {
const byte color = *srcPtr++;
const byte color2 = *srcPtr++;
dst[0] = color;
dst[1] = color2;
dst[2] = color;
dst[3] = color2;
dst[pitch] = color;
dst[pitch + 1] = color2;
dst[pitch + 2] = color;
dst[pitch + 3] = color2;
dst += 4;
}
dst += pitch;
}
}
}
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