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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 
SK_BLITBWMASK_NAME(const SkBitmap & bitmap,const SkMask & srcMask,const SkIRect & clip SK_BLITBWMASK_ARGS)26 static void SK_BLITBWMASK_NAME(const SkBitmap& bitmap, const SkMask& srcMask, const SkIRect& clip SK_BLITBWMASK_ARGS)
27 {
28     SkASSERT(clip.fRight <= srcMask.fBounds.fRight);
29 
30     int cx = clip.fLeft;
31     int cy = clip.fTop;
32     int maskLeft = srcMask.fBounds.fLeft;
33     unsigned mask_rowBytes = srcMask.fRowBytes;
34     unsigned bitmap_rowBytes = bitmap.rowBytes();
35     unsigned height = clip.height();
36 
37     SkASSERT(mask_rowBytes != 0);
38     SkASSERT(bitmap_rowBytes != 0);
39     SkASSERT(height != 0);
40 
41     const uint8_t* bits = srcMask.getAddr1(cx, cy);
42     SK_BLITBWMASK_DEVTYPE* device = bitmap.SK_BLITBWMASK_GETADDR(cx, cy);
43 
44     if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight)
45     {
46         do {
47             SK_BLITBWMASK_DEVTYPE* dst = device;
48             unsigned rb = mask_rowBytes;
49             do {
50                 U8CPU mask = *bits++;
51                 SK_BLITBWMASK_BLIT8(mask, dst);
52                 dst += 8;
53             } while (--rb != 0);
54             device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
55         } while (--height != 0);
56     }
57     else
58     {
59         int left_edge = cx - maskLeft;
60         SkASSERT(left_edge >= 0);
61         int rite_edge = clip.fRight - maskLeft;
62         SkASSERT(rite_edge > left_edge);
63 
64         int left_mask = 0xFF >> (left_edge & 7);
65         int rite_mask = 0xFF << (8 - (rite_edge & 7));
66         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         if (rite_mask == 0)
70         {
71             SkASSERT(full_runs >= 0);
72             full_runs -= 1;
73             rite_mask = 0xFF;
74         }
75         if (left_mask == 0xFF)
76             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         device -= left_edge & 7;
81         // have cx reflect our actual starting x-coord
82         cx -= left_edge & 7;
83 
84         if (full_runs < 0)
85         {
86             left_mask &= rite_mask;
87             SkASSERT(left_mask != 0);
88             do {
89                 U8CPU mask = *bits & left_mask;
90                 SK_BLITBWMASK_BLIT8(mask, device);
91                 bits += mask_rowBytes;
92                 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
93             } while (--height != 0);
94         }
95         else
96         {
97             do {
98                 int runs = full_runs;
99                 SK_BLITBWMASK_DEVTYPE* dst = device;
100                 const uint8_t* b = bits;
101                 U8CPU   mask;
102 
103                 mask = *b++ & left_mask;
104                 SK_BLITBWMASK_BLIT8(mask, dst);
105                 dst += 8;
106 
107                 while (--runs >= 0)
108                 {
109                     mask = *b++;
110                     SK_BLITBWMASK_BLIT8(mask, dst);
111                     dst += 8;
112                 }
113 
114                 mask = *b & rite_mask;
115                 SK_BLITBWMASK_BLIT8(mask, dst);
116 
117                 bits += mask_rowBytes;
118                 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
119             } while (--height != 0);
120         }
121     }
122 }
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
130