Fix mipmap generation on Nexus 5x & 6p devices.

src/gpu/vk/GrVkGpu.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 "GrVkGpu.h"
 
 #include "GrContextOptions.h"
@@ skipping 716 matching lines @@
                         VK_ACCESS_TRANSFER_WRITE_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, false);
 
     // Blit original image
     int width = tex->width();
     int height = tex->height();
 
     VkImageBlit blitRegion;
     memset(&blitRegion, 0, sizeof(VkImageBlit));
     blitRegion.srcSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
     blitRegion.srcOffsets[0] = { 0, 0, 0 };
-    blitRegion.srcOffsets[1] = { width, height, 0 };
+    blitRegion.srcOffsets[1] = { width, height, 1 };
     blitRegion.dstSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
     blitRegion.dstOffsets[0] = { 0, 0, 0 };
-    blitRegion.dstOffsets[1] = { width, height, 0 };
+    blitRegion.dstOffsets[1] = { width, height, 1 };
 
     fCurrentCmdBuffer->blitImage(this,
                                  oldResource,
                                  oldImage,
                                  VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
                                  tex->resource(),
                                  tex->image(),
                                  VK_IMAGE_LAYOUT_GENERAL,
                                  1,
                                  &blitRegion,
@@ skipping 22 matching lines @@
         int prevHeight = height;
         width = SkTMax(1, width / 2);
         height = SkTMax(1, height / 2);
 
         imageMemoryBarrier.subresourceRange.baseMipLevel = mipLevel - 1;
         this->addImageMemoryBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT,
                                     false, &imageMemoryBarrier);
 
         blitRegion.srcSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, mipLevel - 1, 0, 1 };
         blitRegion.srcOffsets[0] = { 0, 0, 0 };
-        blitRegion.srcOffsets[1] = { prevWidth, prevHeight, 0 };
+        blitRegion.srcOffsets[1] = { prevWidth, prevHeight, 1 };
         blitRegion.dstSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, mipLevel, 0, 1 };
         blitRegion.dstOffsets[0] = { 0, 0, 0 };
-        blitRegion.dstOffsets[1] = { width, height, 0 };
+        blitRegion.dstOffsets[1] = { width, height, 1 };
         fCurrentCmdBuffer->blitImage(this,
                                      *tex,
                                      *tex,
                                      1,
                                      &blitRegion,
                                      VK_FILTER_LINEAR);
         ++mipLevel;
     }
 
     oldResource->unref(this);
@@ skipping 890 matching lines @@
     aglSwapBuffers(aglGetCurrentContext());
     int set_a_break_pt_here = 9;
     aglSwapBuffers(aglGetCurrentContext());
 #elif defined(SK_BUILD_FOR_WIN32)
     SwapBuf();
     int set_a_break_pt_here = 9;
     SwapBuf();
 #endif
 #endif
 }