/src/mozilla-central/gfx/2d/BufferEdgePad.cpp
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | #include "BufferEdgePad.h" |
8 | | |
9 | | #include "2D.h" // for DrawTarget |
10 | | #include "Point.h" // for IntSize |
11 | | #include "Types.h" // for SurfaceFormat |
12 | | |
13 | | #include "nsRegion.h" |
14 | | |
15 | | namespace mozilla { |
16 | | namespace gfx { |
17 | | |
18 | | void |
19 | | PadDrawTargetOutFromRegion(DrawTarget* aDrawTarget, const nsIntRegion &aRegion) |
20 | | { |
21 | | struct LockedBits { |
22 | | uint8_t *data; |
23 | | IntSize size; |
24 | | int32_t stride; |
25 | | SurfaceFormat format; |
26 | | static int clamp(int x, int min, int max) |
27 | 0 | { |
28 | 0 | if (x < min) |
29 | 0 | x = min; |
30 | 0 | if (x > max) |
31 | 0 | x = max; |
32 | 0 | return x; |
33 | 0 | } |
34 | | |
35 | | static void ensure_memcpy(uint8_t *dst, uint8_t *src, size_t n, uint8_t *bitmap, int stride, int height) |
36 | 0 | { |
37 | 0 | if (src + n > bitmap + stride*height) { |
38 | 0 | MOZ_CRASH("GFX: long src memcpy"); |
39 | 0 | } |
40 | 0 | if (src < bitmap) { |
41 | 0 | MOZ_CRASH("GFX: short src memcpy"); |
42 | 0 | } |
43 | 0 | if (dst + n > bitmap + stride*height) { |
44 | 0 | MOZ_CRASH("GFX: long dst mempcy"); |
45 | 0 | } |
46 | 0 | if (dst < bitmap) { |
47 | 0 | MOZ_CRASH("GFX: short dst mempcy"); |
48 | 0 | } |
49 | 0 | } |
50 | | |
51 | 0 | static void visitor(void *closure, VisitSide side, int x1, int y1, int x2, int y2) { |
52 | 0 | LockedBits *lb = static_cast<LockedBits*>(closure); |
53 | 0 | uint8_t *bitmap = lb->data; |
54 | 0 | const int bpp = gfx::BytesPerPixel(lb->format); |
55 | 0 | const int stride = lb->stride; |
56 | 0 | const int width = lb->size.width; |
57 | 0 | const int height = lb->size.height; |
58 | 0 |
|
59 | 0 | if (side == VisitSide::TOP) { |
60 | 0 | if (y1 > 0) { |
61 | 0 | x1 = clamp(x1, 0, width - 1); |
62 | 0 | x2 = clamp(x2, 0, width - 1); |
63 | 0 | ensure_memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp, bitmap, stride, height); |
64 | 0 | memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp); |
65 | 0 | } |
66 | 0 | } else if (side == VisitSide::BOTTOM) { |
67 | 0 | if (y1 < height) { |
68 | 0 | x1 = clamp(x1, 0, width - 1); |
69 | 0 | x2 = clamp(x2, 0, width - 1); |
70 | 0 | ensure_memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp, bitmap, stride, height); |
71 | 0 | memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp); |
72 | 0 | } |
73 | 0 | } else if (side == VisitSide::LEFT) { |
74 | 0 | if (x1 > 0) { |
75 | 0 | while (y1 != y2) { |
76 | 0 | memcpy(&bitmap[(x1-1)*bpp + y1 * stride], &bitmap[x1*bpp + y1*stride], bpp); |
77 | 0 | y1++; |
78 | 0 | } |
79 | 0 | } |
80 | 0 | } else if (side == VisitSide::RIGHT) { |
81 | 0 | if (x1 < width) { |
82 | 0 | while (y1 != y2) { |
83 | 0 | memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[(x1-1)*bpp + y1*stride], bpp); |
84 | 0 | y1++; |
85 | 0 | } |
86 | 0 | } |
87 | 0 | } |
88 | 0 |
|
89 | 0 | } |
90 | | } lb; |
91 | | |
92 | | if (aDrawTarget->LockBits(&lb.data, &lb.size, &lb.stride, &lb.format)) { |
93 | | // we can only pad software targets so if we can't lock the bits don't pad |
94 | | aRegion.VisitEdges(lb.visitor, &lb); |
95 | | aDrawTarget->ReleaseBits(lb.data); |
96 | | } |
97 | | } |
98 | | |
99 | | } // namespace gfx |
100 | | } // namespace mozilla |