1 /*
2 * Copyright 2017 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 "SkCoreBlitters.h"
9 #include "SkShader.h"
10 #include "SkUtils.h"
11 #include "SkXfermodePriv.h"
12 #include "SkBlitMask.h"
13 #include "SkColorPriv.h"
14
15 #include "SkNx.h"
16
D16_S32X_src(uint16_t dst[],const SkPMColor src[],int count,uint8_t coverage)17 static void D16_S32X_src(uint16_t dst[], const SkPMColor src[], int count, uint8_t coverage) {
18 SkASSERT(coverage == 0xFF);
19 for (int i = 0; i < count; ++i) {
20 dst[i] = SkPixel32ToPixel16(src[i]);
21 }
22 }
23
D16_S32X_src_coverage(uint16_t dst[],const SkPMColor src[],int count,uint8_t coverage)24 static void D16_S32X_src_coverage(uint16_t dst[], const SkPMColor src[], int count,
25 uint8_t coverage) {
26 switch (coverage) {
27 case 0: break;
28 case 0xFF:
29 for (int i = 0; i < count; ++i) {
30 dst[i] = SkPixel32ToPixel16(src[i]);
31 }
32 break;
33 default:
34 unsigned scale = coverage + (coverage >> 7);
35 for (int i = 0; i < count; ++i) {
36 dst[i] = SkSrcOver32To16(SkAlphaMulQ(src[i], scale), dst[i]);
37 }
38 break;
39 }
40 }
41
D16_S32A_srcover(uint16_t dst[],const SkPMColor src[],int count,uint8_t coverage)42 static void D16_S32A_srcover(uint16_t dst[], const SkPMColor src[], int count, uint8_t coverage) {
43 SkASSERT(coverage == 0xFF);
44 for (int i = 0; i < count; ++i) {
45 dst[i] = SkSrcOver32To16(src[i], dst[i]);
46 }
47 }
48
D16_S32A_srcover_coverage(uint16_t dst[],const SkPMColor src[],int count,uint8_t coverage)49 static void D16_S32A_srcover_coverage(uint16_t dst[], const SkPMColor src[], int count,
50 uint8_t coverage) {
51 switch (coverage) {
52 case 0: break;
53 case 0xFF:
54 for (int i = 0; i < count; ++i) {
55 dst[i] = SkSrcOver32To16(src[i], dst[i]);
56 }
57 break;
58 default:
59 unsigned scale = coverage + (coverage >> 7);
60 for (int i = 0; i < count; ++i) {
61 dst[i] = SkSrcOver32To16(SkAlphaMulQ(src[i], scale), dst[i]);
62 }
63 break;
64 }
65 }
66
Supports(const SkPixmap & device,const SkPaint & paint)67 bool SkRGB565_Shader_Blitter::Supports(const SkPixmap& device, const SkPaint& paint) {
68 if (device.colorType() != kRGB_565_SkColorType) {
69 return false;
70 }
71 if (device.colorSpace()) {
72 return false;
73 }
74 if (paint.getBlendMode() != SkBlendMode::kSrcOver &&
75 paint.getBlendMode() != SkBlendMode::kSrc) {
76 return false;
77 }
78 if (paint.isLCDRenderText()) {
79 return false;
80 }
81 if (paint.isDither()) {
82 return false;
83 }
84 return true;
85 }
86
SkRGB565_Shader_Blitter(const SkPixmap & device,const SkPaint & paint,SkShaderBase::Context * shaderContext)87 SkRGB565_Shader_Blitter::SkRGB565_Shader_Blitter(const SkPixmap& device,
88 const SkPaint& paint, SkShaderBase::Context* shaderContext)
89 : INHERITED(device, paint, shaderContext)
90 {
91 SkASSERT(shaderContext);
92 SkASSERT(Supports(device, paint));
93
94 fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * (sizeof(SkPMColor)));
95
96 bool isOpaque = SkToBool(shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag);
97
98 if (paint.getBlendMode() == SkBlendMode::kSrc || isOpaque) {
99 fBlend = D16_S32X_src;
100 fBlendCoverage = D16_S32X_src_coverage;
101 } else { // srcover
102 fBlend = isOpaque ? D16_S32X_src : D16_S32A_srcover;
103 fBlendCoverage = isOpaque ? D16_S32X_src_coverage : D16_S32A_srcover_coverage;
104 }
105 }
106
~SkRGB565_Shader_Blitter()107 SkRGB565_Shader_Blitter::~SkRGB565_Shader_Blitter() {
108 sk_free(fBuffer);
109 }
110
blitH(int x,int y,int width)111 void SkRGB565_Shader_Blitter::blitH(int x, int y, int width) {
112 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());
113
114 uint16_t* device = fDevice.writable_addr16(x, y);
115
116 SkPMColor* span = fBuffer;
117 fShaderContext->shadeSpan(x, y, span, width);
118 fBlend(device, span, width, 0xFF);
119 }
120
blitAntiH(int x,int y,const SkAlpha coverage[],const int16_t runs[])121 void SkRGB565_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha coverage[],
122 const int16_t runs[]) {
123 SkPMColor* span = fBuffer;
124 uint16_t* device = fDevice.writable_addr16(x, y);
125 auto* shaderContext = fShaderContext;
126
127 for (;;) {
128 int count = *runs;
129 if (count <= 0) {
130 break;
131 }
132 int aa = *coverage;
133 if (aa) {
134 shaderContext->shadeSpan(x, y, span, count);
135 fBlendCoverage(device, span, count, aa);
136 }
137 device += count;
138 runs += count;
139 coverage += count;
140 x += count;
141 }
142 }
143