Function iluScale1D_

DevIL/src-ILU/src/ilu_scale.cpp:191–307

ILimage *iluScale1D_(ILimage *Image, ILimage *Scaled, ILuint Width)
{
	ILuint		x1, x2;
	ILuint		NewX1, NewX2, NewX3, x, c;
	ILdouble	ScaleX, t1, t2, f;
	ILushort	*ShortPtr, *SShortPtr;
	ILuint		*IntPtr, *SIntPtr;

	if (Image == NULL) {
		ilSetError(ILU_ILLEGAL_OPERATION);
		return IL_FALSE;
	}

	ScaleX = (ILdouble)Width / Image->Width;

	ShortPtr = (ILushort*)Image->Data;
	SShortPtr = (ILushort*)Scaled->Data;
	IntPtr = (ILuint*)Image->Data;
	SIntPtr = (ILuint*)Scaled->Data;

	if (iluFilter == ILU_NEAREST) {
		switch (Image->Bpc)
		{
			case 1:
				for (x = 0; x < Width; x++) {
					NewX1 = x * Scaled->Bpp;
					NewX2 = (ILuint)(x / ScaleX) * Image->Bpp;
					for (c = 0; c < Scaled->Bpp; c++) {
						Scaled->Data[NewX1 + c] = Image->Data[NewX2 + c];
					}
				}
				break;
			case 2:
				for (x = 0; x < Width; x++) {
					NewX1 = x * Scaled->Bpp;
					NewX2 = (ILuint)(x / ScaleX) * Image->Bpp;
					for (c = 0; c < Scaled->Bpp; c++) {
						SShortPtr[NewX1 + c] = ShortPtr[NewX2 + c];
					}
				}
				break;
			case 4:
				for (x = 0; x < Width; x++) {
					NewX1 = x * Scaled->Bpp;
					NewX2 = (ILuint)(x / ScaleX) * Image->Bpp;
					for (c = 0; c < Scaled->Bpp; c++) {
						SIntPtr[NewX1 + c] = IntPtr[NewX2 + c];
					}
				}
				break;
		}
	}
	else {  // IL_LINEAR or IL_BILINEAR
		switch (Image->Bpc)
		{
			case 1:
				NewX3 = 0;
				for (x = 0; x < Width; x++) {