Function SaveToBMP

Source/Helper.cpp:1019–1073

}

HRESULT SaveToBMP(BYTE* src, const UINT src_pitch, const UINT width, const UINT height, const UINT bitdepth, const wchar_t* filename)
{
	if (!src || !filename) {
		return E_POINTER;
	}

	if (!src_pitch || !width || !height || (bitdepth != 8 && bitdepth != 32)) {
		return E_ABORT;
	}

	const UINT tablecolors = (bitdepth == 8) ? 256 : 0;
	const UINT dst_pitch = width * bitdepth / 8;
	const UINT len = dst_pitch * height;

	std::unique_ptr<BYTE[]> dib(new(std::nothrow) BYTE[sizeof(BITMAPINFOHEADER) + tablecolors * 4 + len]);

	if (dib) {
		BITMAPINFOHEADER* bih = (BITMAPINFOHEADER*)dib.get();
		ZeroMemory(bih, sizeof(BITMAPINFOHEADER));
		bih->biSize = sizeof(BITMAPINFOHEADER);
		bih->biWidth = width;
		bih->biHeight = -(LONG)height; // top-down RGB bitmap
		bih->biBitCount = bitdepth;
		bih->biPlanes = 1;
		bih->biSizeImage = DIBSIZE(*bih);
		bih->biClrUsed = tablecolors;

		BYTE* p = (BYTE*)(bih + 1);
		for (unsigned i = 0; i < tablecolors; i++) {
			*p++ = (BYTE)i;
			*p++ = (BYTE)i;
			*p++ = (BYTE)i;
			*p++ = 0;
		}

		CopyPlaneAsIs(height, p, dst_pitch, src, src_pitch);

		BITMAPFILEHEADER bfh;
		bfh.bfType = 0x4d42;
		bfh.bfOffBits = sizeof(bfh) + sizeof(BITMAPINFOHEADER) + tablecolors * 4;
		bfh.bfSize = bfh.bfOffBits + len;
		bfh.bfReserved1 = bfh.bfReserved2 = 0;

		FILE* fp;
		if (_wfopen_s(&fp, filename, L"wb") == 0) {
			fwrite(&bfh, sizeof(bfh), 1, fp);
			fwrite(dib.get(), sizeof(BITMAPINFOHEADER) + tablecolors * 4 + len, 1, fp);
			fclose(fp);

			return S_OK;
		}
	}

	return E_FAIL;
}

HRESULT SaveToImage(BYTE* src, const UINT pitch, const UINT width, const UINT height, const UINT bitdepth, const std::wstring_view filename)
{