1 /* libs/graphics/sgl/SkBlitBWMaskTemplate.h
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include "SkBitmap.h"
19 #include "SkMask.h"
20
21 #ifndef ClearLow3Bits_DEFINED
22 #define ClearLow3Bits_DEFINED
23 #define ClearLow3Bits(x) ((unsigned)(x) >> 3 << 3)
24 #endif
25
26 /*
27 SK_BLITBWMASK_NAME name of function(const SkBitmap& bitmap, const SkMask& mask, const SkIRect& clip, SK_BLITBWMASK_ARGS)
28 SK_BLITBWMASK_ARGS list of additional arguments to SK_BLITBWMASK_NAME, beginning with a comma
29 SK_BLITBWMASK_BLIT8 name of function(U8CPU byteMask, SK_BLITBWMASK_DEVTYPE* dst, int x, int y)
30 SK_BLITBWMASK_GETADDR either getAddr32 or getAddr16 or getAddr8
31 SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8
32 */
33
SK_BLITBWMASK_NAME(const SkBitmap & bitmap,const SkMask & srcMask,const SkIRect & clip SK_BLITBWMASK_ARGS)34 static void SK_BLITBWMASK_NAME(const SkBitmap& bitmap, const SkMask& srcMask, const SkIRect& clip SK_BLITBWMASK_ARGS)
35 {
36 SkASSERT(clip.fRight <= srcMask.fBounds.fRight);
37
38 int cx = clip.fLeft;
39 int cy = clip.fTop;
40 int maskLeft = srcMask.fBounds.fLeft;
41 unsigned mask_rowBytes = srcMask.fRowBytes;
42 unsigned bitmap_rowBytes = bitmap.rowBytes();
43 unsigned height = clip.height();
44
45 SkASSERT(mask_rowBytes != 0);
46 SkASSERT(bitmap_rowBytes != 0);
47 SkASSERT(height != 0);
48
49 const uint8_t* bits = srcMask.getAddr1(cx, cy);
50 SK_BLITBWMASK_DEVTYPE* device = bitmap.SK_BLITBWMASK_GETADDR(cx, cy);
51
52 if (cx == maskLeft && clip.fRight == srcMask.fBounds.fRight)
53 {
54 do {
55 SK_BLITBWMASK_DEVTYPE* dst = device;
56 unsigned rb = mask_rowBytes;
57 do {
58 U8CPU mask = *bits++;
59 SK_BLITBWMASK_BLIT8(mask, dst);
60 dst += 8;
61 } while (--rb != 0);
62 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
63 } while (--height != 0);
64 }
65 else
66 {
67 int left_edge = cx - maskLeft;
68 SkASSERT(left_edge >= 0);
69 int rite_edge = clip.fRight - maskLeft;
70 SkASSERT(rite_edge > left_edge);
71
72 int left_mask = 0xFF >> (left_edge & 7);
73 int rite_mask = 0xFF << (8 - (rite_edge & 7));
74 int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3);
75
76 // check for empty right mask, so we don't read off the end (or go slower than we need to)
77 if (rite_mask == 0)
78 {
79 SkASSERT(full_runs >= 0);
80 full_runs -= 1;
81 rite_mask = 0xFF;
82 }
83 if (left_mask == 0xFF)
84 full_runs -= 1;
85
86 // back up manually so we can keep in sync with our byte-aligned src
87 // and not trigger an assert from the getAddr## function
88 device -= left_edge & 7;
89 // have cx reflect our actual starting x-coord
90 cx -= left_edge & 7;
91
92 if (full_runs < 0)
93 {
94 left_mask &= rite_mask;
95 SkASSERT(left_mask != 0);
96 do {
97 U8CPU mask = *bits & left_mask;
98 SK_BLITBWMASK_BLIT8(mask, device);
99 bits += mask_rowBytes;
100 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
101 } while (--height != 0);
102 }
103 else
104 {
105 do {
106 int runs = full_runs;
107 SK_BLITBWMASK_DEVTYPE* dst = device;
108 const uint8_t* b = bits;
109 U8CPU mask;
110
111 mask = *b++ & left_mask;
112 SK_BLITBWMASK_BLIT8(mask, dst);
113 dst += 8;
114
115 while (--runs >= 0)
116 {
117 mask = *b++;
118 SK_BLITBWMASK_BLIT8(mask, dst);
119 dst += 8;
120 }
121
122 mask = *b & rite_mask;
123 SK_BLITBWMASK_BLIT8(mask, dst);
124
125 bits += mask_rowBytes;
126 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
127 } while (--height != 0);
128 }
129 }
130 }
131
132 #undef SK_BLITBWMASK_NAME
133 #undef SK_BLITBWMASK_ARGS
134 #undef SK_BLITBWMASK_BLIT8
135 #undef SK_BLITBWMASK_GETADDR
136 #undef SK_BLITBWMASK_DEVTYPE
137 #undef SK_BLITBWMASK_DOROWSETUP
138