jumper, bilinear and bicubic sampling stages

This splits SkImageShaderContext into three parts:
   - SkJumper_GatherCtx: always, already done
   - SkJumper_SamplerCtx: when bilinear or bicubic
   - MiscCtx: other little bits (the matrix, paint color, tiling limits)

Thanks for the snazzy allocator that allows this Herb!

Both SkJumper and SkRasterPipeline_opts.h should be speaking all the
same types now.

I've copied the comments about bilinear/bicubic to SkJumper with little
typo fixes and clarifications.

Change-Id: I4ba7b7c02feba3f65f5292169a22c060e34933c6
Reviewed-on: https://skia-review.googlesource.com/13269
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/jumper/SkJumper.h b/src/jumper/SkJumper.h
index b440391f38..7a3f4e85f5 100644
--- a/src/jumper/SkJumper.h
+++ b/src/jumper/SkJumper.h
@@ -52,8 +52,10 @@
 //   - the _i and _f user-defined literal operators call C() for you in a prettier way; or
 //   - you can load values from this struct.
 
+static const int SkJumper_kMaxStride = 8;
+
 struct SkJumper_constants {
-    float iota[8];      //  0,1,2,3,4,5,6,7
+    float iota[SkJumper_kMaxStride];   //  0,1,2,3,4,...
 };
 
 struct SkJumper_GatherCtx {
@@ -62,4 +64,14 @@ struct SkJumper_GatherCtx {
     int             stride;
 };
 
+// State shared by save_xy, accumulate, and bilinear_* / bicubic_*.
+struct SkJumper_SamplerCtx {
+    float      x[SkJumper_kMaxStride];
+    float      y[SkJumper_kMaxStride];
+    float     fx[SkJumper_kMaxStride];
+    float     fy[SkJumper_kMaxStride];
+    float scalex[SkJumper_kMaxStride];
+    float scaley[SkJumper_kMaxStride];
+};
+
 #endif//SkJumper_DEFINED