[graphite] Allow graphite to compile without ganesh and add shared gn files.

With this you should be able to set skia_enable_gpu=false in your gn
args and still be able to compile and run graphite.

Bug: skia:12466
Change-Id: Ibffc8774a8c46afad3f717dabc54fa831338a807
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/463317
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>

BUILD.gn

@@ -843,7 +843,7 @@ optional("gpu") {
   public_configs = []
   public_deps = []
 
-  sources = skia_gpu_sources + skia_sksl_gpu_sources
+  sources = skia_gpu_sources + skia_shared_gpu_sources + skia_sksl_gpu_sources
   if (skia_enable_skgpu_v2) {
     sources += skia_skgpu_v2_sources
   }
@@ -1045,7 +1045,7 @@ optional("graphite") {
   enabled = skia_enable_graphite
   public_defines = [ "SK_GRAPHITE_ENABLED" ]
   public = skia_graphite_public
-  sources = skia_graphite_sources
+  sources = skia_graphite_sources + skia_shared_gpu_sources
   if (skia_use_metal) {
     public_defines += [ "SK_METAL" ]
     sources += skia_graphite_mtl_sources

experimental/graphite/src/Image_Graphite.cpp

@@ -7,8 +7,10 @@
 
 #include "experimental/graphite/src/Image_Graphite.h"
 
+#if SK_SUPPORT_GPU
 // TODO: move onAsFragmentProcessor off of SkImage_Base and remove this include
 #include "src/gpu/GrFragmentProcessor.h"
+#endif
 
 namespace skgpu {
 
@@ -18,6 +20,7 @@ Image_Graphite::Image_Graphite(const SkImageInfo& ii)
 
 Image_Graphite::~Image_Graphite() {}
 
+#if SK_SUPPORT_GPU
 std::unique_ptr<GrFragmentProcessor> Image_Graphite::onAsFragmentProcessor(
         GrRecordingContext*,
         SkSamplingOptions,
@@ -27,5 +30,6 @@ std::unique_ptr<GrFragmentProcessor> Image_Graphite::onAsFragmentProcessor(
         const SkRect* domain) const {
     return nullptr;
 }
+#endif
 
 } // namespace skgpu

experimental/graphite/src/Image_Graphite.h

@@ -50,6 +50,7 @@ public:
 protected:
 
 private:
+#if SK_SUPPORT_GPU
     std::tuple<GrSurfaceProxyView, GrColorType> onAsView(
             GrRecordingContext*,
             GrMipmapped,
@@ -64,6 +65,7 @@ private:
             const SkMatrix&,
             const SkRect* subset,
             const SkRect* domain) const override;
+#endif
 
 };
 

gn/gpu.gni

@@ -254,7 +254,6 @@ skia_gpu_sources = [
   "$_src/gpu/SurfaceContext.h",
   "$_src/gpu/SurfaceFillContext.cpp",
   "$_src/gpu/SurfaceFillContext.h",
-  "$_src/gpu/VertexWriter.h",
 
   # Ops
   "$_src/gpu/effects/GrBezierEffect.cpp",
@@ -826,3 +825,5 @@ skia_native_gpu_sources = [
   "$_src/gpu/gl/mac/GrGLMakeNativeInterface_mac.cpp",
   "$_src/gpu/gl/win/GrGLMakeNativeInterface_win.cpp",
 ]
+
+skia_shared_gpu_sources = [ "$_src/gpu/VertexWriter.h" ]

include/core/SkTypes.h

@@ -236,7 +236,7 @@
 #  define SK_SUPPORT_GPU 1
 #endif
 
-#if SK_SUPPORT_GPU
+#if SK_SUPPORT_GPU || SK_GRAPHITE_ENABLED
 #  if !defined(SK_ENABLE_SKSL)
 #    define SK_ENABLE_SKSL
 #  endif