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SkBlendMode.cpp File Reference
#include "include/core/SkBlendMode.h"
#include "include/core/SkColor.h"
#include "include/core/SkPaint.h"
#include "include/private/SkColorData.h"
#include "src/base/SkVx.h"
#include "src/core/SkBlendModePriv.h"
#include "src/core/SkRasterPipeline.h"
#include "src/core/SkRasterPipelineOpContexts.h"
#include "src/core/SkRasterPipelineOpList.h"
#include <optional>

Go to the source code of this file.

Functions

bool SkBlendMode_ShouldPreScaleCoverage (SkBlendMode mode, bool rgb_coverage)
 
bool SkBlendMode_SupportsCoverageAsAlpha (SkBlendMode mode)
 
bool SkBlendMode_AsCoeff (SkBlendMode mode, SkBlendModeCoeff *src, SkBlendModeCoeff *dst)
 
void SkBlendMode_AppendStages (SkBlendMode mode, SkRasterPipeline *p)
 
SkPMColor4f SkBlendMode_Apply (SkBlendMode mode, const SkPMColor4f &src, const SkPMColor4f &dst)
 
const char * SkBlendMode_Name (SkBlendMode bm)
 
static bool just_solid_color (const SkPaint &p)
 
SkBlendFastPath CheckFastPath (const SkPaint &paint, bool dstIsOpaque)
 

Function Documentation

◆ CheckFastPath()

SkBlendFastPath CheckFastPath ( const SkPaint &  paint,
bool  dstIsOpaque 
)

Given a paint, determine whether the paint's blend mode can be replaced with kSrcOver or not drawn at all. This can inform drawing optimizations.

Definition at line 208 of file SkBlendMode.cpp.

208 {
209 const auto bm = paint.asBlendMode();
210 if (!bm) {
211 return SkBlendFastPath::kNormal;
212 }
213 switch (bm.value()) {
214 case SkBlendMode::kSrcOver:
215 return SkBlendFastPath::kSrcOver;
216 case SkBlendMode::kSrc:
217 if (just_solid_color(paint)) {
218 return SkBlendFastPath::kSrcOver;
219 }
220 return SkBlendFastPath::kNormal;
221 case SkBlendMode::kDst:
222 return SkBlendFastPath::kSkipDrawing;
223 case SkBlendMode::kDstOver:
224 if (dstIsOpaque) {
225 return SkBlendFastPath::kSkipDrawing;
226 }
227 return SkBlendFastPath::kNormal;
228 case SkBlendMode::kSrcIn:
229 if (dstIsOpaque && just_solid_color(paint)) {
230 return SkBlendFastPath::kSrcOver;
231 }
232 return SkBlendFastPath::kNormal;
233 case SkBlendMode::kDstIn:
234 if (just_solid_color(paint)) {
235 return SkBlendFastPath::kSkipDrawing;
236 }
237 return SkBlendFastPath::kNormal;
238 default:
239 return SkBlendFastPath::kNormal;
240 }
241}
just_solid_color
static bool just_solid_color(const SkPaint &p)
Definition SkBlendMode.cpp:204
SkBlendMode::kDstIn
@ kDstIn
r = d * sa
SkBlendMode::kSrcOver
@ kSrcOver
r = s + (1-sa)*d
SkBlendMode::kDstOver
@ kDstOver
r = d + (1-da)*s
SkBlendMode::kSrcIn
@ kSrcIn
r = s * da
paint
const Paint & paint
Definition color_source.cc:38

◆ just_solid_color()

static bool just_solid_color ( const SkPaint &  p)
static

Definition at line 204 of file SkBlendMode.cpp.

204 {
205 return SK_AlphaOPAQUE == p.getAlpha() && !p.getColorFilter() && !p.getShader();
206}
SK_AlphaOPAQUE
constexpr SkAlpha SK_AlphaOPAQUE
Definition SkColor.h:94
dart_profiler_symbols.p
p
Definition dart_profiler_symbols.py:55

◆ SkBlendMode_AppendStages()

void SkBlendMode_AppendStages ( SkBlendMode  mode,
SkRasterPipeline *  p 
)

Definition at line 97 of file SkBlendMode.cpp.

97 {
98 auto stage = SkRasterPipelineOp::srcover;
99 switch (mode) {
100 case SkBlendMode::kClear: stage = SkRasterPipelineOp::clear; break;
101 case SkBlendMode::kSrc: return; // This stage is a no-op.
102 case SkBlendMode::kDst: stage = SkRasterPipelineOp::move_dst_src; break;
103 case SkBlendMode::kSrcOver: stage = SkRasterPipelineOp::srcover; break;
104 case SkBlendMode::kDstOver: stage = SkRasterPipelineOp::dstover; break;
105 case SkBlendMode::kSrcIn: stage = SkRasterPipelineOp::srcin; break;
106 case SkBlendMode::kDstIn: stage = SkRasterPipelineOp::dstin; break;
107 case SkBlendMode::kSrcOut: stage = SkRasterPipelineOp::srcout; break;
108 case SkBlendMode::kDstOut: stage = SkRasterPipelineOp::dstout; break;
109 case SkBlendMode::kSrcATop: stage = SkRasterPipelineOp::srcatop; break;
110 case SkBlendMode::kDstATop: stage = SkRasterPipelineOp::dstatop; break;
111 case SkBlendMode::kXor: stage = SkRasterPipelineOp::xor_; break;
112 case SkBlendMode::kPlus: stage = SkRasterPipelineOp::plus_; break;
113 case SkBlendMode::kModulate: stage = SkRasterPipelineOp::modulate; break;
114
115 case SkBlendMode::kScreen: stage = SkRasterPipelineOp::screen; break;
116 case SkBlendMode::kOverlay: stage = SkRasterPipelineOp::overlay; break;
117 case SkBlendMode::kDarken: stage = SkRasterPipelineOp::darken; break;
118 case SkBlendMode::kLighten: stage = SkRasterPipelineOp::lighten; break;
119 case SkBlendMode::kColorDodge: stage = SkRasterPipelineOp::colordodge; break;
120 case SkBlendMode::kColorBurn: stage = SkRasterPipelineOp::colorburn; break;
121 case SkBlendMode::kHardLight: stage = SkRasterPipelineOp::hardlight; break;
122 case SkBlendMode::kSoftLight: stage = SkRasterPipelineOp::softlight; break;
123 case SkBlendMode::kDifference: stage = SkRasterPipelineOp::difference; break;
124 case SkBlendMode::kExclusion: stage = SkRasterPipelineOp::exclusion; break;
125 case SkBlendMode::kMultiply: stage = SkRasterPipelineOp::multiply; break;
126
127 case SkBlendMode::kHue: stage = SkRasterPipelineOp::hue; break;
128 case SkBlendMode::kSaturation: stage = SkRasterPipelineOp::saturation; break;
129 case SkBlendMode::kColor: stage = SkRasterPipelineOp::color; break;
130 case SkBlendMode::kLuminosity: stage = SkRasterPipelineOp::luminosity; break;
131 }
132 p->append(stage);
133}
SkBlendMode::kSrcOut
@ kSrcOut
r = s * (1-da)
SkBlendMode::kExclusion
@ kExclusion
rc = s + d - two(s*d), ra = kSrcOver
SkBlendMode::kSaturation
@ kSaturation
saturation of source with hue and luminosity of destination
SkBlendMode::kColorBurn
@ kColorBurn
darken destination to reflect source
SkBlendMode::kPlus
@ kPlus
r = min(s + d, 1)
SkBlendMode::kLighten
@ kLighten
rc = s + d - min(s*da, d*sa), ra = kSrcOver
SkBlendMode::kHue
@ kHue
hue of source with saturation and luminosity of destination
SkBlendMode::kModulate
@ kModulate
r = s*d
SkBlendMode::kMultiply
@ kMultiply
r = s*(1-da) + d*(1-sa) + s*d
SkBlendMode::kColorDodge
@ kColorDodge
brighten destination to reflect source
SkBlendMode::kScreen
@ kScreen
r = s + d - s*d
SkBlendMode::kXor
@ kXor
r = s*(1-da) + d*(1-sa)
SkBlendMode::kLuminosity
@ kLuminosity
luminosity of source with hue and saturation of destination
SkBlendMode::kSoftLight
@ kSoftLight
lighten or darken, depending on source
SkBlendMode::kDifference
@ kDifference
rc = s + d - 2*(min(s*da, d*sa)), ra = kSrcOver
SkBlendMode::kOverlay
@ kOverlay
multiply or screen, depending on destination
SkBlendMode::kSrcATop
@ kSrcATop
r = s*da + d*(1-sa)
SkBlendMode::kDstATop
@ kDstATop
r = d*sa + s*(1-da)
SkBlendMode::kColor
@ kColor
hue and saturation of source with luminosity of destination
SkBlendMode::kHardLight
@ kHardLight
multiply or screen, depending on source
SkBlendMode::kDstOut
@ kDstOut
r = d * (1-sa)
SkBlendMode::kDarken
@ kDarken
rc = s + d - max(s*da, d*sa), ra = kSrcOver
SkBlendMode::kClear
@ kClear
r = 0

◆ SkBlendMode_Apply()

SkPMColor4f SkBlendMode_Apply ( SkBlendMode  mode,
const SkPMColor4f &  src,
const SkPMColor4f &  dst 
)

Definition at line 135 of file SkBlendMode.cpp.

135 {
136 // special-case simple/common modes...
137 switch (mode) {
138 case SkBlendMode::kClear: return SK_PMColor4fTRANSPARENT;
139 case SkBlendMode::kSrc: return src;
140 case SkBlendMode::kDst: return dst;
141 case SkBlendMode::kSrcOver: {
142 SkPMColor4f r;
143 (skvx::float4::Load(src.vec()) + skvx::float4::Load(dst.vec()) * (1-src.fA)).store(&r);
144 return r;
145 }
146 default:
147 break;
148 }
149
150 SkRasterPipeline_<256> p;
151 SkPMColor4f src_storage = src,
152 dst_storage = dst,
153 res_storage;
154 SkRasterPipeline_MemoryCtx src_ctx = { &src_storage, 0 },
155 dst_ctx = { &dst_storage, 0 },
156 res_ctx = { &res_storage, 0 };
157
158 p.append(SkRasterPipelineOp::load_f32, &dst_ctx);
159 p.append(SkRasterPipelineOp::move_src_dst);
160 p.append(SkRasterPipelineOp::load_f32, &src_ctx);
161 SkBlendMode_AppendStages(mode, &p);
162 p.append(SkRasterPipelineOp::store_f32, &res_ctx);
163 p.run(0,0, 1,1);
164 return res_storage;
165}
SkBlendMode_AppendStages
void SkBlendMode_AppendStages(SkBlendMode mode, SkRasterPipeline *p)
Definition SkBlendMode.cpp:97
SK_PMColor4fTRANSPARENT
constexpr SkPMColor4f SK_PMColor4fTRANSPARENT
Definition SkColorData.h:378
SkRasterPipeline_
Definition SkRasterPipeline.h:166
gn.cp.dst
dst
Definition cp.py:12
mskp_parser.src
src
Definition mskp_parser.py:22
SkRasterPipeline_MemoryCtx
Definition SkRasterPipelineOpContexts.h:30
skvx::Vec::Load
static SKVX_ALWAYS_INLINE Vec Load(const void *ptr)
Definition SkVx.h:109

◆ SkBlendMode_AsCoeff()

bool SkBlendMode_AsCoeff ( SkBlendMode  mode,
SkBlendModeCoeff *  src,
SkBlendModeCoeff *  dst 
)

Returns true if 'mode' is a coefficient-based blend mode (<= kLastCoeffMode). If true is returned, the mode's src and dst coefficient functions are set in 'src' and 'dst'.

Definition at line 57 of file SkBlendMode.cpp.

57 {
58 struct CoeffRec {
59 SkBlendModeCoeff fSrc;
60 SkBlendModeCoeff fDst;
61 };
62
63 static constexpr CoeffRec kCoeffs[] = {
64 // For Porter-Duff blend functions, color = src * src coeff + dst * dst coeff
65 // src coeff dst coeff blend func
66 // ---------------------- ----------------------- ----------
67 { SkBlendModeCoeff::kZero, SkBlendModeCoeff::kZero }, // clear
68 { SkBlendModeCoeff::kOne, SkBlendModeCoeff::kZero }, // src
69 { SkBlendModeCoeff::kZero, SkBlendModeCoeff::kOne }, // dst
70 { SkBlendModeCoeff::kOne, SkBlendModeCoeff::kISA }, // src-over
71 { SkBlendModeCoeff::kIDA, SkBlendModeCoeff::kOne }, // dst-over
72 { SkBlendModeCoeff::kDA, SkBlendModeCoeff::kZero }, // src-in
73 { SkBlendModeCoeff::kZero, SkBlendModeCoeff::kSA }, // dst-in
74 { SkBlendModeCoeff::kIDA, SkBlendModeCoeff::kZero }, // src-out
75 { SkBlendModeCoeff::kZero, SkBlendModeCoeff::kISA }, // dst-out
76 { SkBlendModeCoeff::kDA, SkBlendModeCoeff::kISA }, // src-atop
77 { SkBlendModeCoeff::kIDA, SkBlendModeCoeff::kSA }, // dst-atop
78 { SkBlendModeCoeff::kIDA, SkBlendModeCoeff::kISA }, // xor
79
80 { SkBlendModeCoeff::kOne, SkBlendModeCoeff::kOne }, // plus
81 { SkBlendModeCoeff::kZero, SkBlendModeCoeff::kSC }, // modulate
82 { SkBlendModeCoeff::kOne, SkBlendModeCoeff::kISC }, // screen
83 };
84
85 if (mode > SkBlendMode::kScreen) {
86 return false;
87 }
88 if (src) {
89 *src = kCoeffs[static_cast<int>(mode)].fSrc;
90 }
91 if (dst) {
92 *dst = kCoeffs[static_cast<int>(mode)].fDst;
93 }
94 return true;
95}
SkBlendModeCoeff
SkBlendModeCoeff
Definition SkBlendMode.h:84
flutter::mode
it will be possible to load the file into Perfetto s trace viewer disable asset Prevents usage of any non test fonts unless they were explicitly Loaded via prefetched default font Indicates whether the embedding started a prefetch of the default font manager before creating the engine run In non interactive mode
Definition switches.h:228

◆ SkBlendMode_Name()

const char * SkBlendMode_Name ( SkBlendMode  blendMode)

Returns name of blendMode as null-terminated C string.

Returns
C string

Definition at line 167 of file SkBlendMode.cpp.

167 {
168 switch (bm) {
169 case SkBlendMode::kClear: return "Clear";
170 case SkBlendMode::kSrc: return "Src";
171 case SkBlendMode::kDst: return "Dst";
172 case SkBlendMode::kSrcOver: return "SrcOver";
173 case SkBlendMode::kDstOver: return "DstOver";
174 case SkBlendMode::kSrcIn: return "SrcIn";
175 case SkBlendMode::kDstIn: return "DstIn";
176 case SkBlendMode::kSrcOut: return "SrcOut";
177 case SkBlendMode::kDstOut: return "DstOut";
178 case SkBlendMode::kSrcATop: return "SrcATop";
179 case SkBlendMode::kDstATop: return "DstATop";
180 case SkBlendMode::kXor: return "Xor";
181 case SkBlendMode::kPlus: return "Plus";
182 case SkBlendMode::kModulate: return "Modulate";
183 case SkBlendMode::kScreen: return "Screen";
184
185 case SkBlendMode::kOverlay: return "Overlay";
186 case SkBlendMode::kDarken: return "Darken";
187 case SkBlendMode::kLighten: return "Lighten";
188 case SkBlendMode::kColorDodge: return "ColorDodge";
189 case SkBlendMode::kColorBurn: return "ColorBurn";
190 case SkBlendMode::kHardLight: return "HardLight";
191 case SkBlendMode::kSoftLight: return "SoftLight";
192 case SkBlendMode::kDifference: return "Difference";
193 case SkBlendMode::kExclusion: return "Exclusion";
194 case SkBlendMode::kMultiply: return "Multiply";
195
196 case SkBlendMode::kHue: return "Hue";
197 case SkBlendMode::kSaturation: return "Saturation";
198 case SkBlendMode::kColor: return "Color";
199 case SkBlendMode::kLuminosity: return "Luminosity";
200 }
201 SkUNREACHABLE;
202}
SkUNREACHABLE
#define SkUNREACHABLE
Definition SkAssert.h:135

◆ SkBlendMode_ShouldPreScaleCoverage()

bool SkBlendMode_ShouldPreScaleCoverage ( SkBlendMode  mode,
bool  rgb_coverage 
)

Definition at line 21 of file SkBlendMode.cpp.

21 {
22 // The most important things we do here are:
23 // 1) never pre-scale with rgb coverage if the blend mode involves a source-alpha term;
24 // 2) always pre-scale Plus.
25 //
26 // When we pre-scale with rgb coverage, we scale each of source r,g,b, with a distinct value,
27 // and source alpha with one of those three values. This process destructively updates the
28 // source-alpha term, so we can't evaluate blend modes that need its original value.
29 //
30 // Plus always requires pre-scaling as a specific quirk of its implementation in
31 // SkRasterPipeline. This lets us put the clamp inside the blend mode itself rather
32 // than as a separate stage that'd come after the lerp.
33 //
34 // This function is a finer-grained breakdown of SkBlendMode_SupportsCoverageAsAlpha().
35 switch (mode) {
36 case SkBlendMode::kDst: // d --> no sa term, ok!
37 case SkBlendMode::kDstOver: // d + s*inv(da) --> no sa term, ok!
38 case SkBlendMode::kPlus: // clamp(s+d) --> no sa term, ok!
39 return true;
40
41 case SkBlendMode::kDstOut: // d * inv(sa)
42 case SkBlendMode::kSrcATop: // s*da + d*inv(sa)
43 case SkBlendMode::kSrcOver: // s + d*inv(sa)
44 case SkBlendMode::kXor: // s*inv(da) + d*inv(sa)
45 return !rgb_coverage;
46
47 default: break;
48 }
49 return false;
50}

◆ SkBlendMode_SupportsCoverageAsAlpha()

bool SkBlendMode_SupportsCoverageAsAlpha ( SkBlendMode  mode)

Definition at line 53 of file SkBlendMode.cpp.

53 {
54 return SkBlendMode_ShouldPreScaleCoverage(mode, false);
55}
SkBlendMode_ShouldPreScaleCoverage
bool SkBlendMode_ShouldPreScaleCoverage(SkBlendMode mode, bool rgb_coverage)
Definition SkBlendMode.cpp:21
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