Emulator gralloc: Support HAL_PIXEL_FORMAT_BLOB

Bug: 6243944
Change-Id: I2864bc59be9df8741639a291c71e2f65dde5bc0b

tools/emulator/opengl/system/gralloc/gralloc.cpp

@@ -189,9 +189,20 @@ static int gralloc_alloc(alloc_device_t* dev,
                 // Raw sensor data cannot be used by HW
                 return -EINVAL;
             }
+            // Not expecting to actually create any GL surfaces for this
             glFormat = GL_LUMINANCE;
             glType = GL_UNSIGNED_SHORT;
             break;
+        case HAL_PIXEL_FORMAT_BLOB:
+            bpp = 1;
+            if (! (sw_read && sw_write) ) {
+                // Blob data cannot be used by HW
+                return -EINVAL;
+            }
+            // Not expecting to actually create any GL surfaces for this
+            glFormat = GL_LUMINANCE;
+            glType = GL_UNSIGNED_BYTE;
+            break;
         default:
             return -EINVAL;
     }