Add support for SkImageGenerator creating external textures

Copy the SkImageGenerator texture if tiling is needed and
original texture target is GR_GL_TEXTURE_EXTERNAL.

Bug: skia:
Change-Id: I98f5acc3883e2060b1a35f80633b02b08a706107
Reviewed-on: https://skia-review.googlesource.com/18268
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stan Iliev <stani@google.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/gpu/GrBitmapTextureMaker.cpp b/src/gpu/GrBitmapTextureMaker.cpp
index bde827658a..762b72c811 100644
--- a/src/gpu/GrBitmapTextureMaker.cpp
+++ b/src/gpu/GrBitmapTextureMaker.cpp
@@ -28,7 +28,12 @@ GrBitmapTextureMaker::GrBitmapTextureMaker(GrContext* context, const SkBitmap& b
 }
 
 sk_sp<GrTextureProxy> GrBitmapTextureMaker::refOriginalTextureProxy(bool willBeMipped,
-                                                                    SkColorSpace* dstColorSpace) {
+                                                                    SkColorSpace* dstColorSpace,
+                                                                    AllowedTexGenType onlyIfFast) {
+    if (AllowedTexGenType::kCheap == onlyIfFast) {
+        return nullptr;
+    }
+
     sk_sp<GrTextureProxy> proxy;
 
     if (fOriginalKey.isValid()) {