add experimental bilerp_clamp_8888 stage

It looks like we can specialize hot image shaders into their
own single stages for a good speedup on both x86 and ARM.

I've started here with bilerp_clamp_8888, and will
follow up with bgra and 565, and lowp versions of those,
and probably also the same for nearest neighbors.

All pixels are identical in GMs.

Change-Id: I2f6995767cd38053d670b8d0bfdb71b687803d70
Reviewed-on: https://skia-review.googlesource.com/82100
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/jumper/SkJumper.h b/src/jumper/SkJumper.h
index ea08e0d1ca..4dea21d90a 100644
--- a/src/jumper/SkJumper.h
+++ b/src/jumper/SkJumper.h
@@ -63,10 +63,10 @@ struct SkJumper_MemoryCtx {
 };
 
 struct SkJumper_GatherCtx {
-    void* pixels;
-    int   stride;
-    float width,
-          height;
+    const void* pixels;
+    int         stride;
+    float       width;
+    float       height;
 };
 
 // State shared by save_xy, accumulate, and bilinear_* / bicubic_*.