collapse parametric_{r,g,b} into parametric, remove _a and gamma_dst

parametric_a and gamma_dst were unused outside of unit tests.

In all other cases, we always use parametric_{r,g,b} together
and always pass them the same argument.  So we can collapse
them into a single stage like gamma and to/from_srgb.

Change-Id: I08cea896c7744f97b4f4bf9e029f5d643e45e177
Reviewed-on: https://skia-review.googlesource.com/140576
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/src/effects/SkHighContrastFilter.cpp b/src/effects/SkHighContrastFilter.cpp
index be6180a531..2d0b0f97fe 100644
--- a/src/effects/SkHighContrastFilter.cpp
+++ b/src/effects/SkHighContrastFilter.cpp
@@ -73,9 +73,7 @@ void SkHighContrast_Filter::onAppendStages(SkRasterPipeline* p,
         square->G = 2.0f; square->A = 1.0f;
         square->B = square->C = square->D = square->E = square->F = 0;
 
-        p->append(SkRasterPipeline::parametric_r, square);
-        p->append(SkRasterPipeline::parametric_g, square);
-        p->append(SkRasterPipeline::parametric_b, square);
+        p->append(SkRasterPipeline::parametric, square);
     }
 
     if (fConfig.fGrayscale) {
@@ -122,9 +120,7 @@ void SkHighContrast_Filter::onAppendStages(SkRasterPipeline* p,
         sqrt->G = 0.5f; sqrt->A = 1.0f;
         sqrt->B = sqrt->C = sqrt->D = sqrt->E = sqrt->F = 0;
 
-        p->append(SkRasterPipeline::parametric_r, sqrt);
-        p->append(SkRasterPipeline::parametric_g, sqrt);
-        p->append(SkRasterPipeline::parametric_b, sqrt);
+        p->append(SkRasterPipeline::parametric, sqrt);
     }
 
     if (!shaderIsOpaque) {