Adding Crunch at r319.

third_party/crunch/crnlib/crn_dxt_fast.h

@@ -0,0 +1,21 @@
+// File: crn_dxt_fast.h
+// See Copyright Notice and license at the end of inc/crnlib.h
+#pragma once
+#include "crn_color.h"
+#include "crn_dxt.h"
+
+namespace crnlib
+{
+   namespace dxt_fast
+   {
+      void compress_color_block(uint n, const color_quad_u8* block, uint& low16, uint& high16, uint8* pSelectors, bool refine = false);
+      void compress_color_block(dxt1_block* pDXT1_block, const color_quad_u8* pBlock, bool refine = false);
+      
+      void compress_alpha_block(uint n, const color_quad_u8* block, uint& low8, uint& high8, uint8* pSelectors, uint comp_index);
+      void compress_alpha_block(dxt5_block* pDXT5_block, const color_quad_u8* pBlock, uint comp_index);
+      
+      void find_representative_colors(uint n, const color_quad_u8* pBlock, color_quad_u8& lo, color_quad_u8& hi);
+      
+   } // namespace dxt_fast
+
+} // namespace crnlib