Add some external dependencies.

extern/EtcLib/Etc/Etc.cpp

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015 The Etc2Comp Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EtcConfig.h"
+#include "Etc.h"
+
+#include <string.h>
+
+namespace Etc
+{
+	// ----------------------------------------------------------------------------------------------------
+	// C-style inteface to the encoder
+	//
+	void Encode(float *a_pafSourceRGBA,
+				unsigned int a_uiSourceWidth, 
+				unsigned int a_uiSourceHeight,
+				Image::Format a_format,
+				ErrorMetric a_eErrMetric,
+				float a_fEffort,
+				unsigned int a_uiJobs,
+				unsigned int a_uiMaxJobs,
+				unsigned char **a_ppaucEncodingBits,
+				unsigned int *a_puiEncodingBitsBytes,
+				unsigned int *a_puiExtendedWidth,
+				unsigned int *a_puiExtendedHeight, 
+				int *a_piEncodingTime_ms, bool a_bVerboseOutput)
+	{
+
+		Image image(a_pafSourceRGBA, a_uiSourceWidth,
+					a_uiSourceHeight,
+					a_eErrMetric);
+		image.m_bVerboseOutput = a_bVerboseOutput;
+		image.Encode(a_format, a_eErrMetric, a_fEffort, a_uiJobs, a_uiMaxJobs);
+
+		*a_ppaucEncodingBits = image.GetEncodingBits();
+		*a_puiEncodingBitsBytes = image.GetEncodingBitsBytes();
+		*a_puiExtendedWidth = image.GetExtendedWidth();
+		*a_puiExtendedHeight = image.GetExtendedHeight();
+		*a_piEncodingTime_ms = image.GetEncodingTimeMs();
+	}
+
+	// ----------------------------------------------------------------------------------------------------
+	//
+
+}