1 // Copyright 2019 Google LLC.
2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3 #include <memory>
4
5 #include "tools/fiddle/examples.h"
6 REG_FIDDLE(Canvas_accessTopRasterHandle, 256, 256, true, 0) {
DeleteCallback(void *,void * context)7 static void DeleteCallback(void*, void* context) {
8 delete (char*) context;
9 }
10 class CustomAllocator : public SkRasterHandleAllocator {
11 public:
allocHandle(const SkImageInfo & info,Rec * rec)12 bool allocHandle(const SkImageInfo& info, Rec* rec) override {
13 char* context = new char[4]{'s', 'k', 'i', 'a'};
14 rec->fReleaseProc = DeleteCallback;
15 rec->fReleaseCtx = context;
16 rec->fHandle = context;
17 rec->fPixels = context;
18 rec->fRowBytes = 4;
19 return true;
20 }
updateHandle(Handle handle,const SkMatrix & ctm,const SkIRect & clip_bounds)21 void updateHandle(Handle handle, const SkMatrix& ctm, const SkIRect& clip_bounds) override {
22 // apply canvas matrix and clip to custom environment
23 }
24 };
25
draw(SkCanvas * canvas)26 void draw(SkCanvas* canvas) {
27 const SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
28 std::unique_ptr<SkCanvas> c2 =
29 SkRasterHandleAllocator::MakeCanvas(std::make_unique<CustomAllocator>(), info);
30 char* context = (char*) c2->accessTopRasterHandle();
31 SkDebugf("context = %.4s\n", context);
32 }
33 } // END FIDDLE
34