1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAntiRun_DEFINED
#define SkAntiRun_DEFINED
#include "SkBlitter.h"
class SkAlphaRuns {
public:
int16_t* fRuns;
uint8_t* fAlpha;
bool empty() const {
SkASSERT(fRuns[0] > 0);
return fAlpha[0] == 0 && fRuns[fRuns[0]] == 0;
}
void reset(int width);
/**
* Returns the offsetX value that should be passed on the next call,
* assuming we're on the same scanline. If the caller is switching
* scanlines, then offsetX should be 0 when this is called.
*/
int add(int x, U8CPU startAlpha, int middleCount, U8CPU stopAlpha,
U8CPU maxValue, int offsetX);
SkDEBUGCODE(void assertValid(int y, int maxStep) const;)
SkDEBUGCODE(void dump() const;)
static void Break(int16_t runs[], uint8_t alpha[], int x, int count);
static void BreakAt(int16_t runs[], uint8_t alpha[], int x) {
while (x > 0) {
int n = runs[0];
SkASSERT(n > 0);
if (x < n) {
alpha[x] = alpha[0];
runs[0] = SkToS16(x);
runs[x] = SkToS16(n - x);
break;
}
runs += n;
alpha += n;
x -= n;
}
}
private:
SkDEBUGCODE(int fWidth;)
SkDEBUGCODE(void validate() const;)
};
#endif
|
