start on SkJumper lowp mode

Just 3 stages implemented so far:

  load_8888
  swap_rb
  store_8888

That's enough to make the shortest non-trivial pipeline
that you see in the new unit test.

Change-Id: Iabf90866ab452f7183d8c8dec1405ece2db695dc
Reviewed-on: https://skia-review.googlesource.com/18458
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/SkRasterPipelineTest.cpp b/tests/SkRasterPipelineTest.cpp
index f65a2c9868..014683c9b9 100644
--- a/tests/SkRasterPipelineTest.cpp
+++ b/tests/SkRasterPipelineTest.cpp
@@ -205,3 +205,31 @@ DEF_TEST(SkRasterPipeline_tail, r) {
         }
     }
 }
+
+DEF_TEST(SkRasterPipeline_lowp, r) {
+    uint32_t rgba[64];
+    for (int i = 0; i < 64; i++) {
+        rgba[i] = (4*i+0) << 0
+                | (4*i+1) << 8
+                | (4*i+2) << 16
+                | (4*i+3) << 24;
+    }
+
+    void* ptr = rgba;
+
+    SkRasterPipeline_<256> p;
+    p.append(SkRasterPipeline::load_8888,  &ptr);
+    p.append(SkRasterPipeline::swap_rb);
+    p.append(SkRasterPipeline::store_8888, &ptr);
+    p.run(0,0,64);
+
+    for (int i = 0; i < 64; i++) {
+        uint32_t want = (4*i+0) << 16
+                      | (4*i+1) << 8
+                      | (4*i+2) << 0
+                      | (4*i+3) << 24;
+        if (rgba[i] != want) {
+            ERRORF(r, "got %08x, want %08x\n", rgba[i], want);
+        }
+    }
+}