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 writable_addr[8,16,32]
23 SK_BLITBWMASK_DEVTYPE either U32 or U16 or U8
24 */
25
SK_BLITBWMASK_NAME(const SkPixmap & dst,const SkMask & srcMask,const SkIRect & clip SK_BLITBWMASK_ARGS)26 static void SK_BLITBWMASK_NAME(const SkPixmap& dst, const SkMask& srcMask,
27 const SkIRect& clip SK_BLITBWMASK_ARGS) {
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 size_t bitmap_rowBytes = dst.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 = dst.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 rite_mask &= 0xFF; // only want low-8 bits of mask
67 int full_runs = (rite_edge >> 3) - ((left_edge + 7) >> 3);
68
69 // check for empty right mask, so we don't read off the end (or go slower than we need to)
70 if (rite_mask == 0)
71 {
72 SkASSERT(full_runs >= 0);
73 full_runs -= 1;
74 rite_mask = 0xFF;
75 }
76 if (left_mask == 0xFF)
77 full_runs -= 1;
78
79 // back up manually so we can keep in sync with our byte-aligned src
80 // and not trigger an assert from the getAddr## function
81 device -= left_edge & 7;
82
83 if (full_runs < 0)
84 {
85 left_mask &= rite_mask;
86 SkASSERT(left_mask != 0);
87 do {
88 U8CPU mask = *bits & left_mask;
89 SK_BLITBWMASK_BLIT8(mask, device);
90 bits += mask_rowBytes;
91 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
92 } while (--height != 0);
93 }
94 else
95 {
96 do {
97 int runs = full_runs;
98 SK_BLITBWMASK_DEVTYPE* dst = device;
99 const uint8_t* b = bits;
100 U8CPU mask;
101
102 mask = *b++ & left_mask;
103 SK_BLITBWMASK_BLIT8(mask, dst);
104 dst += 8;
105
106 while (--runs >= 0)
107 {
108 mask = *b++;
109 SK_BLITBWMASK_BLIT8(mask, dst);
110 dst += 8;
111 }
112
113 mask = *b & rite_mask;
114 SK_BLITBWMASK_BLIT8(mask, dst);
115
116 bits += mask_rowBytes;
117 device = (SK_BLITBWMASK_DEVTYPE*)((char*)device + bitmap_rowBytes);
118 } while (--height != 0);
119 }
120 }
121 }
122
123 #undef SK_BLITBWMASK_NAME
124 #undef SK_BLITBWMASK_ARGS
125 #undef SK_BLITBWMASK_BLIT8
126 #undef SK_BLITBWMASK_GETADDR
127 #undef SK_BLITBWMASK_DEVTYPE
128 #undef SK_BLITBWMASK_DOROWSETUP
129