Add matrix constructing helpers to SkMatrix

gm/texturedomaineffect.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
@@ skipping 106 matching lines @@
                     GrTextureDomain::Mode mode = (GrTextureDomain::Mode) m;
                     SkAutoTUnref<GrFragmentProcessor> fp(
                         GrTextureDomainEffect::Create(texture, textureMatrices[tm],
                                                 GrTextureDomain::MakeTexelDomain(texture,
                                                                                 texelDomains[d]),
                                                 mode, GrTextureParams::kNone_FilterMode));
 
                     if (!fp) {
                         continue;
                     }
-                    SkMatrix viewMatrix;
-                    viewMatrix.setTranslate(x, y);
+                    const SkMatrix viewMatrix = SkMatrix::MakeTrans(x, y);
                     GrPipelineBuilder pipelineBuilder;
                     pipelineBuilder.setRenderTarget(rt);
                     pipelineBuilder.addColorProcessor(fp);
 
                     tt.target()->drawSimpleRect(&pipelineBuilder,
                                                 GrColor_WHITE,
                                                 viewMatrix,
                                                 renderRect);
                     x += renderRect.width() + kTestPad;
                 }
@@ skipping 13 matching lines @@
 };
 
 // Windows builds did not like SkScalar initialization in class :(
 const SkScalar TextureDomainEffect::kDrawPad = 10.f;
 const SkScalar TextureDomainEffect::kTestPad = 10.f;
 
 DEF_GM( return SkNEW(TextureDomainEffect); )
 }
 
 #endif