Start from DC rather than texture in GrTexutreParamsAdjuster copy code.

src/gpu/GrTextureParamsAdjuster.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 "GrTextureParamsAdjuster.h"
 
 #include "GrCaps.h"
@@ skipping 17 matching lines @@
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GrTexture* copy_on_gpu(GrTexture* inputTexture, const SkIRect* subset,
                               const CopyParams& copyParams) {
     SkASSERT(!subset || !subset->isEmpty());
     GrContext* context = inputTexture->getContext();
     SkASSERT(context);
     const GrCaps* caps = context->caps();
 
-    // Either it's a cache miss or the original wasn't cached to begin with.
-    GrSurfaceDesc rtDesc = inputTexture->desc();
-    rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;
-    rtDesc.fWidth = copyParams.fWidth;
-    rtDesc.fHeight = copyParams.fHeight;
-    rtDesc.fConfig = GrMakePixelConfigUncompressed(rtDesc.fConfig);
+    GrPixelConfig config = GrMakePixelConfigUncompressed(inputTexture->config());
 
     // If the config isn't renderable try converting to either A8 or an 32 bit config. Otherwise,
     // fail.
-    if (!caps->isConfigRenderable(rtDesc.fConfig, false)) {
-        if (GrPixelConfigIsAlphaOnly(rtDesc.fConfig)) {
+    if (!caps->isConfigRenderable(config, false)) {
+        if (GrPixelConfigIsAlphaOnly(config)) {
             if (caps->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
-                rtDesc.fConfig = kAlpha_8_GrPixelConfig;
+                config = kAlpha_8_GrPixelConfig;
             } else if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
-                rtDesc.fConfig = kSkia8888_GrPixelConfig;
+                config = kSkia8888_GrPixelConfig;
             } else {
                 return nullptr;
             }
         } else if (kRGB_GrColorComponentFlags ==
-                   (kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(rtDesc.fConfig))) {
+                (kRGB_GrColorComponentFlags & GrPixelConfigComponentMask(config))) {
             if (caps->isConfigRenderable(kSkia8888_GrPixelConfig, false)) {
-                rtDesc.fConfig = kSkia8888_GrPixelConfig;
+                config = kSkia8888_GrPixelConfig;
             } else {
                 return nullptr;
             }
         } else {
             return nullptr;
         }
     }
 
-    SkAutoTUnref<GrTexture> copy(context->textureProvider()->createTexture(rtDesc,
-                                                                           SkBudgeted::kYes));
-    if (!copy) {
+    sk_sp<GrDrawContext> copyDC = context->newDrawContext(SkBackingFit::kExact, copyParams.fWidth,
+                                                          copyParams.fHeight, config);
+    if (!copyDC) {
         return nullptr;
     }
 
-    // TODO: If no scaling is being performed then use copySurface.
-
     GrPaint paint;
     paint.setGammaCorrect(true);
 
-    // TODO: Initializing these values for no reason cause the compiler is complaining
-    SkScalar sx = 0.f;
-    SkScalar sy = 0.f;
+    SkScalar sx SK_INIT_TO_AVOID_WARNING;
+    SkScalar sy SK_INIT_TO_AVOID_WARNING;
     if (subset) {
         sx = 1.f / inputTexture->width();
         sy = 1.f / inputTexture->height();
     }
 
     if (copyParams.fFilter != GrTextureParams::kNone_FilterMode && subset &&
         (subset->width() != copyParams.fWidth || subset->height() != copyParams.fHeight)) {
         SkRect domain;
         domain.fLeft = (subset->fLeft + 0.5f) * sx;
         domain.fTop = (subset->fTop + 0.5f)* sy;
@@ skipping 16 matching lines @@
     if (subset) {
         localRect = SkRect::Make(*subset);
         localRect.fLeft *= sx;
         localRect.fTop *= sy;
         localRect.fRight *= sx;
         localRect.fBottom *= sy;
     } else {
         localRect = SkRect::MakeWH(1.f, 1.f);
     }
 
-    sk_sp<GrDrawContext> drawContext(context->drawContext(sk_ref_sp(copy->asRenderTarget())));
-    if (!drawContext) {
-        return nullptr;
-    }
-
-    SkRect dstRect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
-    drawContext->fillRectToRect(GrNoClip(), paint, SkMatrix::I(), dstRect, localRect);
-    return copy.release();
+    SkRect dstRect = SkRect::MakeIWH(copyParams.fWidth, copyParams.fHeight);
+    copyDC->fillRectToRect(GrNoClip(), paint, SkMatrix::I(), dstRect, localRect);
+    return copyDC->asTexture().release();
 }
 
 GrTextureAdjuster::GrTextureAdjuster(GrTexture* original,
                                      const SkIRect& contentArea,
                                      bool isAlphaOnly)
     : INHERITED(contentArea.width(), contentArea.height(), isAlphaOnly)
     , fOriginal(original) {
     SkASSERT(SkIRect::MakeWH(original->width(), original->height()).contains(contentArea));
     if (contentArea.fLeft > 0 || contentArea.fTop > 0 ||
         contentArea.fRight < original->width() || contentArea.fBottom < original->height()) {
@@ skipping 393 matching lines @@
 }
 
 GrTexture* GrTextureMaker::generateTextureForParams(const CopyParams& copyParams, bool willBeMipped,
                                                     SkSourceGammaTreatment gammaTreatment) {
     SkAutoTUnref<GrTexture> original(this->refOriginalTexture(willBeMipped, gammaTreatment));
     if (!original) {
         return nullptr;
     }
     return copy_on_gpu(original, nullptr, copyParams);
 }