1 :
2 : /*
3 : * Copyright 2006 The Android Open Source Project
4 : *
5 : * Use of this source code is governed by a BSD-style license that can be
6 : * found in the LICENSE file.
7 : */
8 :
9 :
10 : #include "SkBitmap.h"
11 : #include "SkMask.h"
12 :
13 : #ifndef ClearLow3Bits_DEFINED
14 : #define ClearLow3Bits_DEFINED
15 : #define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3)
16 : #endif
17 :
18 : /*
19 : SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS)
20 : SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma
21 : SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y)
22 : SK_BLITBWMASK_GETADDR either getAddr32 or getAddr16 or getAddr8
23 : SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8
24 : */
25 :
26 0 : static void SK_BLITBWMASK_NAME(const SkBitmap& bitmap, const SkMask& srcMask, const SkIRect& clip SK_BLITBWMASK_ARGS)
27 : {
28 0 : SkASSERT(clip.fRight <= srcMask.fBounds.fRight);
29 :
30 0 : int cx = clip.fLeft;
31 0 : int cy = clip.fTop;
32 0 : int maskLeft = srcMask.fBounds.fLeft;
33 0 : unsigned mask_rowBytes = srcMask.fRowBytes;
34 0 : unsigned bitmap_rowBytes = bitmap.rowBytes();
35 0 : unsigned height = clip.height();
36 :
37 0 : SkASSERT(mask_rowBytes != 0);
38 0 : SkASSERT(bitmap_rowBytes != 0);
39 0 : SkASSERT(height != 0);
40 :
41 0 : const uint8_t* bits = srcMask.getAddr1(cx, cy);
42 0 : SK_BLITBWMASK_DEVTYPE* device = bitmap.SK_BLITBWMASK_GETADDR(cx, cy);
43 :
44 0 : if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight)
45 : {
46 0 : do {
47 0 : SK_BLITBWMASK_DEVTYPE* dst = device;
48 0 : unsigned rb = mask_rowBytes;
49 0 : do {
50 0 : U8CPU mask = *bits++;
51 0 : SK_BLITBWMASK_BLIT8(mask, dst);
52 0 : dst += 8;
53 : } while (--rb != 0);
54 0 : device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
55 0 : } while (--height != 0);
56 : }
57 : else
58 : {
59 0 : int left_edge = cx - maskLeft;
60 0 : SkASSERT(left_edge >= 0);
61 0 : int rite_edge = clip.fRight - maskLeft;
62 0 : SkASSERT(rite_edge > left_edge);
63 :
64 0 : int left_mask = 0xFF >> (left_edge & 7);
65 0 : int rite_mask = 0xFF << (8 - (rite_edge & 7));
66 0 : int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3);
67 :
68 : // check for empty right mask, so we don't read off the end (or go slower than we need to)
69 0 : if (rite_mask == 0)
70 : {
71 0 : SkASSERT(full_runs >= 0);
72 0 : full_runs -= 1;
73 0 : rite_mask = 0xFF;
74 : }
75 0 : if (left_mask == 0xFF)
76 0 : full_runs -= 1;
77 :
78 : // back up manually so we can keep in sync with our byte-aligned src
79 : // and not trigger an assert from the getAddr## function
80 0 : device -= left_edge & 7;
81 : // have cx reflect our actual starting x-coord
82 0 : cx -= left_edge & 7;
83 :
84 0 : if (full_runs < 0)
85 : {
86 0 : left_mask &= rite_mask;
87 0 : SkASSERT(left_mask != 0);
88 0 : do {
89 0 : U8CPU mask = *bits & left_mask;
90 0 : SK_BLITBWMASK_BLIT8(mask, device);
91 0 : bits += mask_rowBytes;
92 0 : device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
93 : } while (--height != 0);
94 : }
95 : else
96 : {
97 0 : do {
98 0 : int runs = full_runs;
99 0 : SK_BLITBWMASK_DEVTYPE* dst = device;
100 0 : const uint8_t* b = bits;
101 : U8CPU mask;
102 :
103 0 : mask = *b++ & left_mask;
104 0 : SK_BLITBWMASK_BLIT8(mask, dst);
105 0 : dst += 8;
106 :
107 0 : while (--runs >= 0)
108 : {
109 0 : mask = *b++;
110 0 : SK_BLITBWMASK_BLIT8(mask, dst);
111 0 : dst += 8;
112 : }
113 :
114 0 : mask = *b & rite_mask;
115 0 : SK_BLITBWMASK_BLIT8(mask, dst);
116 :
117 0 : bits += mask_rowBytes;
118 0 : device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
119 : } while (--height != 0);
120 : }
121 : }
122 0 : }
123 :
124 : #undef SK_BLITBWMASK_NAME
125 : #undef SK_BLITBWMASK_ARGS
126 : #undef SK_BLITBWMASK_BLIT8
127 : #undef SK_BLITBWMASK_GETADDR
128 : #undef SK_BLITBWMASK_DEVTYPE
129 : #undef SK_BLITBWMASK_DOROWSETUP
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