Refactor drawContext/RenderTarget creation

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAutoPixmapStorage.h"
 #include "GrCaps.h"
 #include "GrContext.h"
@@ skipping 231 matching lines @@
     SkAutoTUnref<GrTexture> yTex(ctx->textureProvider()->wrapBackendTexture(
         yDesc, kBorrow_GrWrapOwnership));
     SkAutoTUnref<GrTexture> uTex(ctx->textureProvider()->wrapBackendTexture(
         uDesc, kBorrow_GrWrapOwnership));
     SkAutoTUnref<GrTexture> vTex(ctx->textureProvider()->wrapBackendTexture(
         vDesc, kBorrow_GrWrapOwnership));
     if (!yTex || !uTex || !vTex) {
         return nullptr;
     }
 
-    GrSurfaceDesc dstDesc;
+    const int width = yuvSizes[0].fWidth;
+    const int height = yuvSizes[0].fHeight;
+
     // Needs to be a render target in order to draw to it for the yuv->rgb conversion.
-    dstDesc.fFlags = kRenderTarget_GrSurfaceFlag;
-    dstDesc.fOrigin = origin;
-    dstDesc.fWidth = yuvSizes[0].fWidth;
-    dstDesc.fHeight = yuvSizes[0].fHeight;
-    dstDesc.fConfig = kRGBA_8888_GrPixelConfig;
-    dstDesc.fSampleCnt = 0;
-
-    SkAutoTUnref<GrTexture> dst(ctx->textureProvider()->createTexture(dstDesc, SkBudgeted::kYes));
-    if (!dst) {
+    sk_sp<GrDrawContext> drawContext(ctx->newDrawContext(GrContext::kTight_BackingFit,
+                                                         width, height,
+                                                         kRGBA_8888_GrPixelConfig,
+                                                         0,
+                                                         origin));
+    if (!drawContext) {
         return nullptr;
     }
 
     GrPaint paint;
     paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
     paint.addColorFragmentProcessor(GrYUVEffect::CreateYUVToRGB(yTex, uTex, vTex, yuvSizes,
                                                                 colorSpace))->unref();
 
-    const SkRect rect = SkRect::MakeWH(SkIntToScalar(dstDesc.fWidth),
-                                       SkIntToScalar(dstDesc.fHeight));
-    sk_sp<GrDrawContext> drawContext(ctx->drawContext(sk_ref_sp(dst->asRenderTarget())));
-    if (!drawContext) {
-        return nullptr;
-    }
+    const SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
 
     drawContext->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), rect);
-    ctx->flushSurfaceWrites(dst);
-    return sk_make_sp<SkImage_Gpu>(dstDesc.fWidth, dstDesc.fHeight, kNeedNewImageUniqueID,
-                                   kOpaque_SkAlphaType, dst, budgeted);
+    ctx->flushSurfaceWrites(drawContext->accessRenderTarget());
+    return sk_make_sp<SkImage_Gpu>(width, height, kNeedNewImageUniqueID,
+                                   kOpaque_SkAlphaType,
+                                   drawContext->asTexture().get(), budgeted);
 }
 
 static sk_sp<SkImage> create_image_from_maker(GrTextureMaker* maker, SkAlphaType at, uint32_t id) {
     SkAutoTUnref<GrTexture> texture(maker->refTextureForParams(GrTextureParams::ClampNoFilter()));
     if (!texture) {
         return nullptr;
     }
     return sk_make_sp<SkImage_Gpu>(texture->width(), texture->height(), id, at, texture,
                                    SkBudgeted::kNo);
 }
@@ skipping 162 matching lines @@
         return nullptr;
     }
 
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP);
     ctx->flushSurfaceWrites(dst);
     return dst;
 }