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Side by Side Diff: gm/peekpixels.cpp

Issue 161733002: add peekPixels to SkCanvas and SkSurface (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 6 years, 10 months ago
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1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm.h"
9 #include "SkCanvas.h"
10 #include "SkPath.h"
11 #include "SkSurface.h"
12 #include "SkPicture.h"
13
14 static void draw_content(SkCanvas* canvas) {
15 SkImageInfo info = canvas->imageInfo();
16 SkPaint paint;
17 paint.setAntiAlias(true);
18 canvas->drawCircle(SkScalarHalf(info.width()), SkScalarHalf(info.height()),
19 SkScalarHalf(info.width()), paint);
20 }
21
22 class PeekPixelsGM : public skiagm::GM {
23 public:
24 PeekPixelsGM() {}
25
26 protected:
27 virtual SkString onShortName() SK_OVERRIDE {
28 return SkString("peekpixels");
29 }
30
31 virtual SkISize onISize() SK_OVERRIDE {
32 return SkISize::Make(640, 480);
33 }
34
35 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
36 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
37 SkAutoTUnref<SkSurface> surface(canvas->newSurface(info));
38 if (surface.get()) {
39 SkCanvas* surfCanvas = surface->getCanvas();
40
41 draw_content(surfCanvas);
42 SkBitmap bitmap;
43
44 // test peekPixels
45 {
46 SkImageInfo info;
47 size_t rowBytes;
48 const void* addr = surfCanvas->peekPixels(&info, &rowBytes);
49 if (addr && bitmap.installPixels(info, const_cast<void*>(addr),
50 rowBytes, NULL, NULL)) {
51 canvas->drawBitmap(bitmap, 0, 0, NULL);
52 }
53 }
54
55 // test ROCanvasPixels
56 canvas->translate(120, 0);
57 SkAutoROCanvasPixels ropixels(surfCanvas);
58 if (ropixels.asROBitmap(&bitmap)) {
59 canvas->drawBitmap(bitmap, 0, 0, NULL);
60 }
61
62 // test Surface
63 canvas->translate(120, 0);
64 surface->draw(canvas, 0, 0, NULL);
65 }
66 }
67
68 virtual uint32_t onGetFlags() const {
69 // we explicitly test peekPixels and readPixels, neither of which
70 // return something for a picture-backed canvas, so we skip that test.
71 return kSkipPicture_Flag;
72 }
73
74 private:
75 typedef skiagm::GM INHERITED;
76 };
77
78 DEF_GM( return SkNEW(PeekPixelsGM); )
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