Move SkGammaColorFilter to tools, limit to sRGB

Similarly, limit GrGammaEffect to sRGB (and rename it).

BUG=skia:

Change-Id: I88feef11ab7040bca2fa4c2eed71923ded87a0d0
Reviewed-on: https://skia-review.googlesource.com/7375
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 2 insertions, 96 deletions

diff --git a/gm/gammacolorfilter.cpp b/gm/gammacolorfilter.cpp
index 9e39025b0a..84ebc43def 100644
--- a/gm/gammacolorfilter.cpp
+++ b/gm/gammacolorfilter.cpp
@@ -1,102 +1,8 @@
 /*
- * Copyright 2016 Google Inc.
+ * Copyright 2017 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#include "gm.h"
-#include "SkGammaColorFilter.h"
-#include "SkImage.h"
-
-// Fill a width x height block with a horizontal ramp from 0 to 255
-static void draw_grey_ramp(SkCanvas* canvas, int width, int height, int numSteps) {
-    int greyPerStep = SkScalarRoundToInt(255.0f / numSteps);
-    int widthPerStep = SkScalarRoundToInt(width / SkIntToScalar(numSteps));
-
-    SkIRect rect = SkIRect::MakeWH(widthPerStep, height);
-
-    SkPaint paint;
-    int grey = 0;
-    int x = 0;
-    for (int i = 0; i < numSteps-1; ++i) {
-        paint.setColor(SkColorSetARGB(255, grey, grey, grey));
-
-        rect.offsetTo(x, 0);
-        canvas->drawRect(SkRect::Make(rect), paint);
-
-        x += widthPerStep;
-        grey += greyPerStep;
-    }
-
-    paint.setColor(SK_ColorWHITE);
-    rect.setLTRB(x, 0, width, height);
-    canvas->drawRect(SkRect::Make(rect), paint);
-}
-
-static sk_sp<SkImage> create_grey_ramp(int width, int height, int numSteps) {
-    SkBitmap bm;
-    bm.allocN32Pixels(width, height);
-    SkCanvas canvas(bm);
-    canvas.clear(0x0);
-
-    draw_grey_ramp(&canvas, width, height, numSteps);
-
-    return SkImage::MakeFromBitmap(bm);
-}
-
-namespace skiagm {
-
-class GammaColorFilterGM : public GM {
-public:
-    GammaColorFilterGM() {
-        this->setBGColor(SK_ColorBLACK);
-    }
-
-protected:
-
-    SkString onShortName() override {
-        return SkString("gammacolorfilter");
-    }
-
-    SkISize onISize() override {
-        return SkISize::Make(4 * kCellWidth, kCellHeight);
-    }
-
-    void onDraw(SkCanvas* canvas) override {
-        GrRenderTargetContext* renderTargetContext =
-            canvas->internal_private_accessTopLayerRenderTargetContext();
-        if (!renderTargetContext) {
-            skiagm::GM::DrawGpuOnlyMessage(canvas);
-            return;
-        }
-
-        sk_sp<SkImage> image(create_grey_ramp(kCellWidth, kCellHeight/2, kNumGreySteps));
-
-        // Leftmost is a non-gamma pair
-        draw_grey_ramp(canvas, kCellWidth, kCellHeight/2, kNumGreySteps);
-        canvas->drawImage(image, 0, kCellHeight/2);
-        canvas->translate(SkIntToScalar(image->width()), 0);
-
-        for (auto gamma : { 1.0f, 1.0f / 1.8f, 1.0f / 2.2f }) {
-            SkPaint paint;
-            paint.setColorFilter(SkGammaColorFilter::Make(gamma));
-
-            draw_grey_ramp(canvas, kCellWidth, kCellHeight/2, kNumGreySteps);
-            canvas->drawImage(image, 0, kCellHeight/2, &paint);
-            canvas->translate(SkIntToScalar(image->width()), 0);
-        }
-    }
-
-private:
-    static constexpr int kCellWidth = 64;
-    static constexpr int kCellHeight = 64;
-    static constexpr int kNumGreySteps = 16;
-
-    typedef GM INHERITED;
-};
-
-//////////////////////////////////////////////////////////////////////////////
-
-DEF_GM(return new GammaColorFilterGM;)
-}
+// Temporary.  When gn_to_bp.py works for DM, we can remove this.