1 /*
2  * Copyright 2015 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 "SkBlitter.h"
9 #include "SkMask.h"
10 #include "Test.h"
11 #include <string.h>
12 
13 class TestBlitter : public SkBlitter {
14 public:
15     TestBlitter(SkIRect bounds, skiatest::Reporter* reporter)
16         : fBounds(bounds)
17         , fReporter(reporter) { }
18 
19     void blitH(int x, int y, int width) override {
20 
21         REPORTER_ASSERT(fReporter, x >= fBounds.fLeft && x < fBounds.fRight);
22         REPORTER_ASSERT(fReporter, y >= fBounds.fTop && y < fBounds.fBottom);
23         int right = x + width;
24         REPORTER_ASSERT(fReporter, right > fBounds.fLeft && right <= fBounds.fRight);
25     }
26 
27     void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) override {
28         SkDEBUGFAIL("blitAntiH not implemented");
29     }
30 
31 private:
32     SkIRect fBounds;
33     skiatest::Reporter* fReporter;
34 };
35 
36 // Exercise all clips compared with different widths of bitMask. Make sure that no buffer
37 // overruns happen.
38 DEF_TEST(BlitAndClip, reporter) {
39     const int originX = 100;
40     const int originY = 100;
41     for (int width = 1; width <= 32; width++) {
42         const int height = 2;
43         int rowBytes = (width + 7) >> 3;
44         uint8_t* bits = new uint8_t[rowBytes * height];
45         memset(bits, 0xAA, rowBytes * height);
46 
47         SkIRect b = {originX, originY, originX + width, originY + height};
48 
49         SkMask mask;
50         mask.fFormat = SkMask::kBW_Format;
51         mask.fBounds = b;
52         mask.fImage = (uint8_t*)bits;
53         mask.fRowBytes = rowBytes;
54 
55         TestBlitter tb(mask.fBounds, reporter);
56 
57         for (int top = b.fTop; top < b.fBottom; top++) {
58             for (int bottom = top + 1; bottom <= b.fBottom; bottom++) {
59                 for (int left = b.fLeft; left < b.fRight; left++) {
60                     for (int right = left + 1; right <= b.fRight; right++) {
61                         SkIRect clipRect = {left, top, right, bottom};
62                         tb.blitMask(mask, clipRect);
63                     }
64                 }
65             }
66         }
67 
68         delete [] bits;
69     }
70 }
71