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 // HASH=4486d0c0b22ad2931db130f42da4c80c
7 REG_FIDDLE(Canvas_accessTopRasterHandle, 256, 256, true, 0) {
DeleteCallback(void *,void * context)8 static void DeleteCallback(void*, void* context) {
9 delete (char*) context;
10 }
11 class CustomAllocator : public SkRasterHandleAllocator {
12 public:
allocHandle(const SkImageInfo & info,Rec * rec)13 bool allocHandle(const SkImageInfo& info, Rec* rec) override {
14 char* context = new char[4]{'s', 'k', 'i', 'a'};
15 rec->fReleaseProc = DeleteCallback;
16 rec->fReleaseCtx = context;
17 rec->fHandle = context;
18 rec->fPixels = context;
19 rec->fRowBytes = 4;
20 return true;
21 }
updateHandle(Handle handle,const SkMatrix & ctm,const SkIRect & clip_bounds)22 void updateHandle(Handle handle, const SkMatrix& ctm, const SkIRect& clip_bounds) override {
23 // apply canvas matrix and clip to custom environment
24 }
25 };
26
draw(SkCanvas * canvas)27 void draw(SkCanvas* canvas) {
28 const SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
29 std::unique_ptr<SkCanvas> c2 =
30 SkRasterHandleAllocator::MakeCanvas(std::make_unique<CustomAllocator>(), info);
31 char* context = (char*) c2->accessTopRasterHandle();
32 SkDebugf("context = %.4s\n", context);
33 }
34 } // END FIDDLE
35