Add SkSpecialImage::makeTextureImage entry point & update filterInput

tests/SpecialImageTest.cpp

 /*
  * Copyright 2016 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 "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 156 matching lines @@
                                                    sk_free(addr);
                                                },
                                                nullptr));
         pixmap.release();
         test_image(img, reporter, true, false, kPad, kFullSize);
     }
 }
 
 
 #if SK_SUPPORT_GPU
+
+static void test_texture_backed(skiatest::Reporter* reporter,
+                                const sk_sp<SkSpecialImage>& orig,
+                                const sk_sp<SkSpecialImage>& gpuBacked) {
+    REPORTER_ASSERT(reporter, gpuBacked);
+    REPORTER_ASSERT(reporter, gpuBacked->peekTexture());
+    REPORTER_ASSERT(reporter, gpuBacked->uniqueID() == orig->uniqueID());
+    REPORTER_ASSERT(reporter, gpuBacked->subset().width() == orig->subset().width() &&
+                              gpuBacked->subset().height() == orig->subset().height());
+}
+
+// Test out the SkSpecialImage::makeTextureImage entry point
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, context) {
+    SkBitmap bm = create_bm();
+
+    const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
+
+    {
+        // raster
+        sk_sp<SkSpecialImage> rasterImage(SkSpecialImage::MakeFromRaster(
+                                                                        nullptr,
+                                                                        SkIRect::MakeWH(kFullSize,
+                                                                                        kFullSize),
+                                                                        bm));
+
+        {
+            sk_sp<SkSpecialImage> fromRaster(rasterImage->makeTextureImage(nullptr, context));
+            test_texture_backed(reporter, rasterImage, fromRaster);
+        }
+
+        {
+            sk_sp<SkSpecialImage> subRasterImage(rasterImage->makeSubset(subset));
+
+            sk_sp<SkSpecialImage> fromSubRaster(subRasterImage->makeTextureImage(nullptr, context));
+            test_texture_backed(reporter, subRasterImage, fromSubRaster);
+        }
+    }
+
+    {
+        // gpu
+        GrSurfaceDesc desc;
+        desc.fConfig = kSkia8888_GrPixelConfig;
+        desc.fFlags = kNone_GrSurfaceFlags;
+        desc.fWidth = kFullSize;
+        desc.fHeight = kFullSize;
+
+        SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc,
+                                                                                  SkBudgeted::kNo,
+                                                                                  bm.getPixels(),
+                                                                                  0));
+        if (!texture) {
+            return;
+        }
+
+        sk_sp<SkSpecialImage> gpuImage(SkSpecialImage::MakeFromGpu(
+                                                                nullptr,
+                                                                SkIRect::MakeWH(kFullSize,
+                                                                                kFullSize),
+                                                                kNeedNewImageUniqueID_SpecialImage,
+                                                                texture));
+
+        {
+            sk_sp<SkSpecialImage> fromGPU(gpuImage->makeTextureImage(nullptr, context));
+            test_texture_backed(reporter, gpuImage, fromGPU);
+        }
+
+        {
+            sk_sp<SkSpecialImage> subGPUImage(gpuImage->makeSubset(subset));
+
+            sk_sp<SkSpecialImage> fromSubGPU(subGPUImage->makeTextureImage(nullptr, context));
+            test_texture_backed(reporter, subGPUImage, fromSubGPU);
+        }
+    }
+}
+
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, context) {
     SkBitmap bm = create_bm();
 
     GrSurfaceDesc desc;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fFlags  = kNone_GrSurfaceFlags;
     desc.fWidth  = kFullSize;
     desc.fHeight = kFullSize;
 
-    SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc, SkBudgeted::kNo,
+    SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc,
+                                                                              SkBudgeted::kNo,
                                                                               bm.getPixels(), 0));
     if (!texture) {
         return;
     }
 
     sk_sp<SkSpecialImage> fullSImg(SkSpecialImage::MakeFromGpu(
                                                             nullptr,
                                                             SkIRect::MakeWH(kFullSize, kFullSize),
                                                             kNeedNewImageUniqueID_SpecialImage,
                                                             texture));
 
     const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);
 
     {
         sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeFromGpu(
                                                                nullptr, subset, 
                                                                kNeedNewImageUniqueID_SpecialImage,
                                                                texture));
         test_image(subSImg1, reporter, false, true, kPad, kFullSize);
     }
 
     {
         sk_sp<SkSpecialImage> subSImg2(fullSImg->makeSubset(subset));
         test_image(subSImg2, reporter, false, true, kPad, kFullSize);
     }
 }
 
 #endif