1 /*
2 * Copyright 2013 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
make_bm(SkBitmap * bm)11 static void make_bm(SkBitmap* bm) {
12 bm->allocN32Pixels(60, 60);
13 bm->eraseColor(0);
14
15 SkCanvas canvas(*bm);
16 SkPaint paint;
17
18 SkPath path;
19 path.moveTo(6, 6);
20 path.lineTo(6, 54);
21 path.lineTo(30, 54);
22 canvas.drawPath(path, paint);
23
24 paint.setStyle(SkPaint::kStroke_Style);
25 canvas.drawRect(SkRect::MakeLTRB(0.5f, 0.5f, 59.5f, 59.5f), paint);
26 }
27
28 // This creates a close, but imperfect concatenation of
29 // scaling the image up by its dst-rect
30 // scaling the image down by the matrix' scale
31 // The bug was that for cases like this, we were incorrectly trying to take a
32 // fast-path in the bitmapshader, but ended up drawing the last col of pixels
33 // twice. The fix resulted in (a) not taking the fast-path, but (b) drawing
34 // the image correctly.
35 //
test_bitmaprect(SkCanvas * canvas)36 static void test_bitmaprect(SkCanvas* canvas) {
37 SkBitmap bm;
38 make_bm(&bm);
39
40 canvas->drawBitmap(bm, 150, 45, NULL);
41
42 SkScalar scale = 0.472560018f;
43 canvas->save();
44 canvas->scale(scale, scale);
45 canvas->drawBitmapRectToRect(bm, NULL, SkRect::MakeXYWH(100, 100, 128, 128), NULL);
46 canvas->restore();
47
48 canvas->scale(-1, 1);
49 canvas->drawBitmap(bm, -310, 45, NULL);
50 }
51
52 class BitmapRectTestGM : public skiagm::GM {
53 public:
BitmapRectTestGM()54 BitmapRectTestGM() {
55
56 }
57
58 protected:
onShortName()59 SkString onShortName() override {
60 return SkString("bitmaprecttest");
61 }
62
onISize()63 SkISize onISize() override {
64 return SkISize::Make(320, 240);
65 }
66
onDraw(SkCanvas * canvas)67 void onDraw(SkCanvas* canvas) override {
68 test_bitmaprect(canvas);
69 }
70
71 private:
72 typedef skiagm::GM INHERITED;
73 };
74
75 //////////////////////////////////////////////////////////////////////////////
76
77 DEF_GM( return new BitmapRectTestGM; )
78