bitmaprecttest.cpp revision d638233cbee849f566036e4974f5924d4048d821 
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
11static void make_bm(SkBitmap* bm) {
12    bm->setConfig(SkBitmap::kARGB_8888_Config, 60, 60);
13    bm->allocPixels();
14    bm->eraseColor(0);
15
16    SkCanvas canvas(*bm);
17    SkPaint paint;
18    paint.setStyle(SkPaint::kStroke_Style);
19    canvas.drawRect(SkRect::MakeLTRB(0.5f, 0.5f, 29.5f, 29.5f), paint);
20}
21
22// This creates a close, but imperfect concatenation of
23//      scaling the image up by its dst-rect
24//      scaling the image down by the matrix' scale
25//  The bug was that for cases like this, we were incorrectly trying to take a
26//  fast-path in the bitmapshader, but ended up drawing the last col of pixels
27//  twice. The fix resulted in (a) not taking the fast-path, but (b) drawing
28//  the image correctly.
29//
30static void test_bitmaprect(SkCanvas* canvas) {
31    SkBitmap bm;
32    make_bm(&bm);
33
34    canvas->drawBitmap(bm, 150, 45, NULL);
35
36    SkScalar scale = 0.452560018f;
37    canvas->scale(scale, scale);
38    canvas->drawBitmapRectToRect(bm, NULL, SkRect::MakeXYWH(100, 100, 128, 128), NULL);
39}
40
41class BitmapRectTestGM : public skiagm::GM {
42public:
43    BitmapRectTestGM() {
44
45    }
46
47protected:
48    virtual SkString onShortName() {
49        return SkString("bitmaprectest");
50    }
51
52    virtual SkISize onISize() {
53        return SkISize::Make(320, 240);
54    }
55
56    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
57        test_bitmaprect(canvas);
58    }
59
60private:
61    typedef skiagm::GM INHERITED;
62};
63
64//////////////////////////////////////////////////////////////////////////////
65
66DEF_GM( return new BitmapRectTestGM; )
67
68