Add BGRA as input format to SkColorSpaceXform

gm/colorspacexform.cpp

 /*
  * Copyright 2013 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 "SkColor.h"
 #include "SkColorSpaceXform.h"
 #include "SkRect.h"
 
 class ColorSpaceXformGM : public skiagm::GM {
 public:
     ColorSpaceXformGM() {}
 
 protected:
     void onOnceBeforeDraw() override {
         SkColor colors[] = {
             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA, SK_ColorCYAN, SK_ColorYELLOW,
             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA,
         };
         static_assert(kNumColors == SK_ARRAY_COUNT(colors), "Fix number of colors.");
 
         for (int i = 0; i < kNumColors; i++) {
             fSRGBColors[i] = SkColor4f::FromColor(colors[i]);
-
-            // FIXME (msarett): SkColorSpaceXform does not support BGRA.
-            colors[i] = SkSwizzle_RB(colors[i]);
         }
 
         static constexpr float kWideGamutRGB_toXYZD50[]{
             0.7161046f, 0.1009296f, 0.1471858f,
             0.2581874f, 0.7249378f, 0.0168748f,
             0.0000000f, 0.0517813f, 0.7734287f,
         };
 
         SkMatrix44 wideGamut(SkMatrix44::kUninitialized_Constructor);
         wideGamut.set3x3RowMajorf(kWideGamutRGB_toXYZD50);
 
         sk_sp<SkColorSpace> srcSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
         sk_sp<SkColorSpace> dstSpace =
                 SkColorSpace::NewRGB(SkColorSpace::kLinear_RenderTargetGamma, wideGamut);
         std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace.get(),
                                                                           dstSpace.get());
 
         xform->apply(fWideGamutColors, colors, kNumColors,
-                     SkColorSpaceXform::kRGBA_F32_ColorFormat, kOpaque_SkAlphaType);
+                     SkColorSpaceXform::kRGBA_F32_ColorFormat,
+                     SkColorSpaceXform::kBGRA_8888_ColorFormat, kOpaque_SkAlphaType);
     }
 
     SkString onShortName() override {
         return SkString("colorspacexform");
     }
 
     SkISize onISize() override {
         return SkISize::Make(500, 200);
     }
 
@@ skipping 23 matching lines @@
 private:
     static constexpr int kNumColors = 10;
 
     SkColor4f fSRGBColors[kNumColors];
     SkColor4f fWideGamutColors[kNumColors];
 
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM(return new ColorSpaceXformGM;)