Support resize in Android Viewer App

tools/viewer/sk_app/android/RasterWindowContext_android.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 "RasterWindowContext_android.h"
 
@@ skipping 14 matching lines @@
 }
 
 RasterWindowContext_android::RasterWindowContext_android(
         void* platformData, const DisplayParams& params) {
     fDisplayParams = params;
     ContextPlatformData_android* androidPlatformData =
             reinterpret_cast<ContextPlatformData_android*>(platformData);
     fNativeWindow = androidPlatformData->fNativeWindow;
     fWidth = ANativeWindow_getWidth(fNativeWindow);
     fHeight = ANativeWindow_getHeight(fNativeWindow);
+    this->setBuffersGeometry();
+}
+
+void RasterWindowContext_android::setBuffersGeometry() {
     int32_t format;
-    switch(params.fColorType) {
+    switch(fDisplayParams.fColorType) {
         case kRGBA_8888_SkColorType:
             format = WINDOW_FORMAT_RGBA_8888;
             break;
         case kRGB_565_SkColorType:
             format = WINDOW_FORMAT_RGB_565;
             break;
         default:
             SkDEBUGFAIL("Unsupported Android color type");
     }
     ANativeWindow_setBuffersGeometry(fNativeWindow, fWidth, fHeight, format);
 }
 
+void RasterWindowContext_android::setDisplayParams(const DisplayParams& params) {
+    fDisplayParams = params;
+    this->setBuffersGeometry();
+}
+
+void RasterWindowContext_android::resize(uint32_t w, uint32_t h) {
+    fWidth = w;
+    fHeight = h;
+    this->setBuffersGeometry();
+}
+
 sk_sp<SkSurface> RasterWindowContext_android::getBackbufferSurface() {
     if (nullptr == fBackbufferSurface) {
         ANativeWindow_lock(fNativeWindow, &fBuffer, &fBounds);
         const int bytePerPixel = fBuffer.format == WINDOW_FORMAT_RGB_565 ? 2 : 4;
         SkImageInfo info = SkImageInfo::Make(fWidth, fHeight,
                                              fDisplayParams.fColorType,
                                              kOpaque_SkAlphaType,
                                              fDisplayParams.fProfileType);
         fBackbufferSurface = SkSurface::MakeRasterDirect(
                 info, fBuffer.bits, fBuffer.stride * bytePerPixel, nullptr);
     }
     return fBackbufferSurface;
 }
 
 
 void RasterWindowContext_android::swapBuffers() {
     ANativeWindow_unlockAndPost(fNativeWindow);
     fBackbufferSurface.reset(nullptr);
 }
 
 }   // namespace sk_app