Add Xlib support to viewer

tools/viewer/sk_app/VulkanWindowContext.h

 
 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef VulkanWindowContext_DEFINED
 #define VulkanWindowContext_DEFINED
 
 #ifdef SK_VULKAN
 
 #include "vk/GrVkBackendContext.h"
 #include "WindowContext.h"
 
 class GrRenderTarget;
 
 namespace sk_app {
 
 class VulkanWindowContext : public WindowContext {
 public:
     ~VulkanWindowContext() override;
 
     // each platform will have to implement these in its CPP file
     static VkSurfaceKHR createVkSurface(VkInstance, void* platformData);
-    static bool canPresent(VkInstance, VkPhysicalDevice, uint32_t queueFamilyIndex);
+    static bool canPresent(VkInstance, VkPhysicalDevice, uint32_t queueFamilyIndex,
+                           void* platformData);
 
     static VulkanWindowContext* Create(void* platformData, const DisplayParams& params) {
         VulkanWindowContext* ctx = new VulkanWindowContext(platformData, params);
         if (!ctx->isValid()) {
             delete ctx;
             return nullptr;
         }
         return ctx;
     }
 
@@ skipping 55 matching lines @@
     VkPtr<PFN_vkDestroySwapchainKHR> fDestroySwapchainKHR;
     VkPtr<PFN_vkGetSwapchainImagesKHR> fGetSwapchainImagesKHR;
     VkPtr<PFN_vkAcquireNextImageKHR> fAcquireNextImageKHR;
     VkPtr<PFN_vkQueuePresentKHR> fQueuePresentKHR;
     VkPtr<PFN_vkCreateSharedSwapchainsKHR> fCreateSharedSwapchainsKHR;
 
     VkSurfaceKHR      fSurface;
     VkSwapchainKHR    fSwapchain;
     uint32_t          fPresentQueueIndex;
     VkQueue           fPresentQueue;
-    int               fWidth;
-    int               fHeight;
 
     uint32_t               fImageCount;
     VkImage*               fImages;         // images in the swapchain
     VkImageLayout*         fImageLayouts;   // layouts of these images when not color attachment
     sk_sp<GrRenderTarget>* fRenderTargets;  // wrapped rendertargets for those images
     sk_sp<SkSurface>*      fSurfaces;       // surfaces client renders to (may not be based on rts)
     VkCommandPool          fCommandPool;
     BackbufferInfo*        fBackbuffers;
     uint32_t               fCurrentBackbufferIndex;
 };
 
 }   // namespace sk_app
 
 #endif // SK_VULKAN
 
 #endif