Add initial pipeline for decompressors

src/utils/SkTextureCompressor.cpp

Index: src/utils/SkTextureCompressor.cpp
diff --git a/src/utils/SkTextureCompressor.cpp b/src/utils/SkTextureCompressor.cpp
index 30fd3072d5b67e8dab3e9981ebef631509893e7e..e9f66725a62ac216fdac886298fb34adb32be071 100644
--- a/src/utils/SkTextureCompressor.cpp
+++ b/src/utils/SkTextureCompressor.cpp
@@ -20,12 +20,12 @@
 
 namespace SkTextureCompressor {
 

[robertphillips, 2014/07/31 15:01:01]

Is there a better name then hardware?

[krajcevski, 2014/07/31 15:12:18]

Done.

-void GetBlockDimensions(Format format, int* dimX, int* dimY) {
+void GetBlockDimensions(Format format, int* dimX, int* dimY, bool hardware) {
     if (NULL == dimX || NULL == dimY) {
         return;
     }
 
-    if (SkTextureCompressorGetPlatformDims(format, dimX, dimY)) {
+    if (!hardware && SkTextureCompressorGetPlatformDims(format, dimX, dimY)) {
         return;
     }
 
@@ -159,4 +159,30 @@ SkBlitter* CreateBlitterForFormat(int width, int height, void* compressedBuffer,
     return NULL;
 }
 
+bool DecompressBufferFromFormat(uint8_t* dst, int dstRowBytes, const uint8_t* src,
+                                int width, int height, Format format) {
+    int dimX, dimY;
+    GetBlockDimensions(format, &dimX, &dimY, true);
+
+    if (width < 0 || ((width % dimX) != 0) || height < 0 || ((height % dimY) != 0)) {
+        return false;
+    }
+
+    switch(format) {
+        case kLATC_Format:
+            DecompressLATC(dst, dstRowBytes, src, width, height);
+            return true;
+
+        case kR11_EAC_Format:
+            DecompressR11EAC(dst, dstRowBytes, src, width, height);
+            return true;
+
+        case kASTC_12x12_Format:
+            // TODO(krajcevski) .. right now just fall through and return false.
+            return false;
+    }
+
+    return false;
+}
+
 }  // namespace SkTextureCompressor