add the CPU backend

src/ebsynth_cuda.h

@@ -0,0 +1,32 @@
+// This software is in the public domain. Where that dedication is not
+// recognized, you are granted a perpetual, irrevocable license to copy
+// and modify this file as you see fit.
+
+#ifndef EBSYNTH_CUDA_H_
+#define EBSYNTH_CUDA_H_
+
+void ebsynthRunCuda(int    numStyleChannels,
+                    int    numGuideChannels,
+                    int    sourceWidth,
+                    int    sourceHeight,
+                    void*  sourceStyleData,
+                    void*  sourceGuideData,
+                    int    targetWidth,
+                    int    targetHeight,
+                    void*  targetGuideData,
+                    void*  targetModulationData,
+                    float* styleWeights,
+                    float* guideWeights,
+                    float  uniformityWeight,
+                    int    patchSize,
+                    int    voteMode,
+                    int    numPyramidLevels,
+                    int*   numSearchVoteItersPerLevel,
+                    int*   numPatchMatchItersPerLevel,
+                    int*   stopThresholdPerLevel,
+                    void*  outputNnfData,
+                    void*  outputImageData);
+
+int ebsynthBackendAvailableCuda();
+
+#endif