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1 /*
2  * Copyright 2011 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "SkBlitRow.h"
9 #include "SkBlitMask.h"
10 #include "SkColorPriv.h"
11 #include "SkOpts.h"
12 #include "SkUtils.h"
13 
14 #define UNROLL
15 
S32_Opaque_BlitRow32(SkPMColor * SK_RESTRICT dst,const SkPMColor * SK_RESTRICT src,int count,U8CPU alpha)16 static void S32_Opaque_BlitRow32(SkPMColor* SK_RESTRICT dst,
17                                  const SkPMColor* SK_RESTRICT src,
18                                  int count, U8CPU alpha) {
19     SkASSERT(255 == alpha);
20     memcpy(dst, src, count * 4);
21 }
22 
S32_Blend_BlitRow32(SkPMColor * SK_RESTRICT dst,const SkPMColor * SK_RESTRICT src,int count,U8CPU alpha)23 static void S32_Blend_BlitRow32(SkPMColor* SK_RESTRICT dst,
24                                 const SkPMColor* SK_RESTRICT src,
25                                 int count, U8CPU alpha) {
26     SkASSERT(alpha <= 255);
27     if (count > 0) {
28         unsigned src_scale = SkAlpha255To256(alpha);
29 
30 #ifdef UNROLL
31         if (count & 1) {
32             *dst = SkPMLerp(*src, *dst, src_scale);
33             src += 1;
34             dst += 1;
35             count -= 1;
36         }
37 
38         const SkPMColor* SK_RESTRICT srcEnd = src + count;
39         while (src != srcEnd) {
40             *dst = SkPMLerp(*src, *dst, src_scale);
41             src += 1;
42             dst += 1;
43             *dst = SkPMLerp(*src, *dst, src_scale);
44             src += 1;
45             dst += 1;
46         }
47 #else
48         do {
49             *dst = SkPMLerp(*src, *dst, src_scale);
50             src += 1;
51             dst += 1;
52         } while (--count > 0);
53 #endif
54     }
55 }
56 
S32A_Blend_BlitRow32(SkPMColor * SK_RESTRICT dst,const SkPMColor * SK_RESTRICT src,int count,U8CPU alpha)57 static void S32A_Blend_BlitRow32(SkPMColor* SK_RESTRICT dst,
58                                  const SkPMColor* SK_RESTRICT src,
59                                  int count, U8CPU alpha) {
60     SkASSERT(alpha <= 255);
61     if (count > 0) {
62 #ifdef UNROLL
63         if (count & 1) {
64             *dst = SkBlendARGB32(*(src++), *dst, alpha);
65             dst += 1;
66             count -= 1;
67         }
68 
69         const SkPMColor* SK_RESTRICT srcEnd = src + count;
70         while (src != srcEnd) {
71             *dst = SkBlendARGB32(*(src++), *dst, alpha);
72             dst += 1;
73             *dst = SkBlendARGB32(*(src++), *dst, alpha);
74             dst += 1;
75         }
76 #else
77         do {
78             *dst = SkBlendARGB32(*src, *dst, alpha);
79             src += 1;
80             dst += 1;
81         } while (--count > 0);
82 #endif
83     }
84 }
85 
86 ///////////////////////////////////////////////////////////////////////////////
87 
88 static const SkBlitRow::Proc32 gDefault_Procs32[] = {
89     S32_Opaque_BlitRow32,
90     S32_Blend_BlitRow32,
91     nullptr,
92     S32A_Blend_BlitRow32
93 };
94 
Factory32(unsigned flags)95 SkBlitRow::Proc32 SkBlitRow::Factory32(unsigned flags) {
96     SkASSERT(flags < SK_ARRAY_COUNT(gDefault_Procs32));
97     // just so we don't crash
98     flags &= kFlags32_Mask;
99 
100     if (flags == 2) {
101         // S32A_Opaque_BlitRow32 has been ported to SkOpts, but not the others yet.
102         return SkOpts::blit_row_s32a_opaque;
103     }
104 
105     SkBlitRow::Proc32 proc = PlatformProcs32(flags);
106     if (nullptr == proc) {
107         proc = gDefault_Procs32[flags];
108     }
109     SkASSERT(proc);
110     return proc;
111 }
112 
Color32(SkPMColor dst[],const SkPMColor src[],int count,SkPMColor color)113 void SkBlitRow::Color32(SkPMColor dst[], const SkPMColor src[], int count, SkPMColor color) {
114     switch (SkGetPackedA32(color)) {
115         case   0: memmove(dst, src, count * sizeof(SkPMColor)); return;
116         case 255: sk_memset32(dst, color, count);               return;
117     }
118     return SkOpts::blit_row_color32(dst, src, count, color);
119 }
120