Add a class representing texture swizzle.

src/effects/SkTableColorFilter.cpp

 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "SkTableColorFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 424 matching lines @@
                                  kColorScaleFactor,
                                  kColorOffsetFactor, kColorOffsetFactor,
                                  kColorOffsetFactor, kColorOffsetFactor);
     }
 
     SkString coord;
 
     fragBuilder->codeAppendf("\t\t%s.a = ", args.fOutputColor);
     coord.printf("vec2(coord.a, %s.a)", yoffsets);
     fragBuilder->appendTextureLookup(args.fSamplers[0], coord.c_str());
-    fragBuilder->codeAppend(";\n");
+    fragBuilder->codeAppend(".a;\n");
 
     fragBuilder->codeAppendf("\t\t%s.r = ", args.fOutputColor);
     coord.printf("vec2(coord.r, %s.r)", yoffsets);
     fragBuilder->appendTextureLookup(args.fSamplers[0], coord.c_str());
-    fragBuilder->codeAppend(";\n");
+    fragBuilder->codeAppend(".a;\n");
 
     fragBuilder->codeAppendf("\t\t%s.g = ", args.fOutputColor);
     coord.printf("vec2(coord.g, %s.g)", yoffsets);
     fragBuilder->appendTextureLookup(args.fSamplers[0], coord.c_str());
-    fragBuilder->codeAppend(";\n");
+    fragBuilder->codeAppend(".a;\n");
 
     fragBuilder->codeAppendf("\t\t%s.b = ", args.fOutputColor);
     coord.printf("vec2(coord.b, %s.b)", yoffsets);
     fragBuilder->appendTextureLookup(args.fSamplers[0], coord.c_str());
-    fragBuilder->codeAppend(";\n");
+    fragBuilder->codeAppend(".a;\n");
 
     fragBuilder->codeAppendf("\t\t%s.rgb *= %s.a;\n", args.fOutputColor, args.fOutputColor);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 const GrFragmentProcessor* ColorTableEffect::Create(GrContext* context, SkBitmap bitmap,
                                                     unsigned flags) {
 
     GrTextureStripAtlas::Desc desc;
     desc.fWidth  = bitmap.width();
     desc.fHeight = 128;
     desc.fRowHeight = bitmap.height();
     desc.fContext = context;
     desc.fConfig = SkImageInfo2GrPixelConfig(bitmap.info());
     GrTextureStripAtlas* atlas = GrTextureStripAtlas::GetAtlas(desc);
     int row = atlas->lockRow(bitmap);
     SkAutoTUnref<GrTexture> texture;
     if (-1 == row) {
         atlas = nullptr;
         texture.reset(GrRefCachedBitmapTexture(context, bitmap, GrTextureParams::ClampNoFilter()));
     } else {
         texture.reset(SkRef(atlas->getTexture()));
     }
 
     return new ColorTableEffect(texture, atlas, row, flags);
 }
 
 ColorTableEffect::ColorTableEffect(GrTexture* texture, GrTextureStripAtlas* atlas, int row,
                                    unsigned flags)
-    : fTextureAccess(texture, "a")
+    : fTextureAccess(texture)
     , fFlags(flags)
     , fAtlas(atlas)
     , fRow(row) {
     this->initClassID<ColorTableEffect>();
     this->addTextureAccess(&fTextureAccess);
 }
 
 ColorTableEffect::~ColorTableEffect() {
     if (fAtlas) {
         fAtlas->unlockRow(fRow);
@@ skipping 97 matching lines @@
 SkColorFilter* SkTableColorFilter::CreateARGB(const uint8_t tableA[256],
                                               const uint8_t tableR[256],
                                               const uint8_t tableG[256],
                                               const uint8_t tableB[256]) {
     return new SkTable_ColorFilter(tableA, tableR, tableG, tableB);
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkTableColorFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTable_ColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END