Add private grpixelconfigs for alpha_8 and alpha_half

Bug: skia:
Change-Id: I5191b6e045aea2a5af2b305b5972ad1e638a7ace
Reviewed-on: https://skia-review.googlesource.com/71763
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/src/gpu/mtl/GrMtlUtil.mm b/src/gpu/mtl/GrMtlUtil.mm
index 24643669ea..9e6c632638 100644
--- a/src/gpu/mtl/GrMtlUtil.mm
+++ b/src/gpu/mtl/GrMtlUtil.mm
@@ -7,6 +7,8 @@
 
 #include "GrMtlUtil.h"
 
+#include "GrTypesPriv.h"
+
 bool GrPixelConfigToMTLFormat(GrPixelConfig config, MTLPixelFormat* format) {
     MTLPixelFormat dontCare;
     if (!format) {
@@ -45,9 +47,12 @@ bool GrPixelConfigToMTLFormat(GrPixelConfig config, MTLPixelFormat* format) {
 #else
             return false;
 #endif
-        case kAlpha_8_GrPixelConfig:
+        case kAlpha_8_GrPixelConfig: // fall through
+        case kAlpha_8_as_Red_GrPixelConfig:
             *format = MTLPixelFormatR8Unorm;
             return true;
+        case kAlpha_8_as_Alpha_GrPixelConfig:
+            return false;
         case kGray_8_GrPixelConfig:
             *format = MTLPixelFormatR8Unorm;
             return true;
@@ -60,9 +65,12 @@ bool GrPixelConfigToMTLFormat(GrPixelConfig config, MTLPixelFormat* format) {
         case kRGBA_half_GrPixelConfig:
             *format = MTLPixelFormatRGBA16Float;
             return true;
-        case kAlpha_half_GrPixelConfig:
+        case kAlpha_half_GrPixelConfig: // fall through
+        case kAlpha_half_as_Red_GrPixelConfig:
             *format = MTLPixelFormatR16Float;
             return true;
+        case kAlpha_half_as_Alpha_GrPixelConfig:
+            return false;
     }
     SK_ABORT("Unexpected config");
     return false;