Refactor drawContext/RenderTarget creation

src/gpu/GrContext.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrContext.h"
 #include "GrContextOptions.h"
 #include "GrDrawingManager.h"
@@ skipping 597 matching lines @@
     return chosenSampleCount <= fGpu->caps()->maxSampleCount() ? chosenSampleCount : 0;
 }
 
 
 sk_sp<GrDrawContext> GrContext::drawContext(sk_sp<GrRenderTarget> rt,
                                             const SkSurfaceProps* surfaceProps) {
     ASSERT_SINGLE_OWNER
     return fDrawingManager->drawContext(std::move(rt), surfaceProps);
 }
 
+sk_sp<GrDrawContext> GrContext::newDrawContext(BackingFit fit,
+                                               int width, int height,
+                                               GrPixelConfig config,
+                                               int sampleCnt,
+                                               GrSurfaceOrigin origin) {
+    GrSurfaceDesc desc;
+    desc.fFlags = kRenderTarget_GrSurfaceFlag;
+    desc.fOrigin = origin;
+    desc.fWidth = width;
+    desc.fHeight = height;
+    desc.fConfig = config;
+    desc.fSampleCnt = sampleCnt;
+
+    sk_sp<GrTexture> tex;
+    if (kTight_BackingFit == fit) {
+        tex.reset(this->textureProvider()->createTexture(desc, SkBudgeted::kYes));
+    } else {
+        tex.reset(this->textureProvider()->createApproxTexture(desc));
+    }
+    if (!tex) {
+        return nullptr;
+    }
+
+    sk_sp<GrDrawContext> drawContext(this->drawContext(sk_ref_sp(tex->asRenderTarget())));
+    if (!drawContext) {
+        return nullptr;
+    }
+
+    return drawContext;
+}
+
 bool GrContext::abandoned() const {
     ASSERT_SINGLE_OWNER
     return fDrawingManager->abandoned();
 }
 
 namespace {
 void test_pm_conversions(GrContext* ctx, int* pmToUPMValue, int* upmToPMValue) {
     GrConfigConversionEffect::PMConversion pmToUPM;
     GrConfigConversionEffect::PMConversion upmToPM;
     GrConfigConversionEffect::TestForPreservingPMConversions(ctx, &pmToUPM, &upmToPM);
@@ skipping 67 matching lines @@
     ASSERT_SINGLE_OWNER
     fResourceCache->setLimits(maxTextures, maxTextureBytes);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 void GrContext::dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const {
     ASSERT_SINGLE_OWNER
     fResourceCache->dumpMemoryStatistics(traceMemoryDump);
 }