1/*
2 * Copyright 2006 The Android Open Source Project
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 "include/core/SkColorSpace.h"
9#include "src/core/SkArenaAlloc.h"
10#include "src/core/SkColorSpacePriv.h"
11#include "src/core/SkColorSpaceXformSteps.h"
12#include "src/core/SkCoreBlitters.h"
13#include "src/core/SkOpts.h"
14#include "src/core/SkRasterPipeline.h"
15#include "src/core/SkSpriteBlitter.h"
16
17extern bool gUseSkVMBlitter;
18
19SkSpriteBlitter::SkSpriteBlitter(const SkPixmap& source)
20 : fSource(source) {}
21
22bool SkSpriteBlitter::setup(const SkPixmap& dst, int left, int top, const SkPaint& paint) {
23 fDst = dst;
24 fLeft = left;
25 fTop = top;
26 fPaint = &paint;
27 return true;
28}
29
30void SkSpriteBlitter::blitH(int x, int y, int width) {
31 SkDEBUGFAIL("how did we get here?");
32
33 // Fallback to blitRect.
34 this->blitRect(x, y, width, 1);
35}
36
37void SkSpriteBlitter::blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) {
38 SkDEBUGFAIL("how did we get here?");
39
40 // No fallback strategy.
41}
42
43void SkSpriteBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
44 SkDEBUGFAIL("how did we get here?");
45
46 // Fall back to superclass if the code gets here in release mode.
47 INHERITED::blitV(x, y, height, alpha);
48}
49
50void SkSpriteBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
51 SkDEBUGFAIL("how did we get here?");
52
53 // Fall back to superclass if the code gets here in release mode.
54 INHERITED::blitMask(mask, clip);
55}
56
57///////////////////////////////////////////////////////////////////////////////
58
59class SkSpriteBlitter_Memcpy final : public SkSpriteBlitter {
60public:
61 static bool Supports(const SkPixmap& dst, const SkPixmap& src, const SkPaint& paint) {
62 // the caller has already inspected the colorspace on src and dst
63 SkASSERT(0 == SkColorSpaceXformSteps(src,dst).flags.mask());
64
65 if (dst.colorType() != src.colorType()) {
66 return false;
67 }
68 if (paint.getMaskFilter() || paint.getColorFilter() || paint.getImageFilter()) {
69 return false;
70 }
71 if (0xFF != paint.getAlpha()) {
72 return false;
73 }
74 SkBlendMode mode = paint.getBlendMode();
75 return SkBlendMode::kSrc == mode || (SkBlendMode::kSrcOver == mode && src.isOpaque());
76 }
77
78 SkSpriteBlitter_Memcpy(const SkPixmap& src)
79 : INHERITED(src) {}
80
81 void blitRect(int x, int y, int width, int height) override {
82 SkASSERT(fDst.colorType() == fSource.colorType());
83 SkASSERT(width > 0 && height > 0);
84
85 char* dst = (char*)fDst.writable_addr(x, y);
86 const char* src = (const char*)fSource.addr(x - fLeft, y - fTop);
87 const size_t dstRB = fDst.rowBytes();
88 const size_t srcRB = fSource.rowBytes();
89 const size_t bytesToCopy = width << fSource.shiftPerPixel();
90
91 while (height --> 0) {
92 memcpy(dst, src, bytesToCopy);
93 dst += dstRB;
94 src += srcRB;
95 }
96 }
97
98private:
99 typedef SkSpriteBlitter INHERITED;
100};
101
102class SkRasterPipelineSpriteBlitter : public SkSpriteBlitter {
103public:
104 SkRasterPipelineSpriteBlitter(const SkPixmap& src, SkArenaAlloc* alloc,
105 sk_sp<SkShader> clipShader)
106 : INHERITED(src)
107 , fAlloc(alloc)
108 , fBlitter(nullptr)
109 , fSrcPtr{nullptr, 0}
110 , fClipShader(std::move(clipShader))
111 {}
112
113 bool setup(const SkPixmap& dst, int left, int top, const SkPaint& paint) override {
114 fDst = dst;
115 fLeft = left;
116 fTop = top;
117 fPaintColor = paint.getColor4f();
118
119 SkRasterPipeline p(fAlloc);
120 p.append_load(fSource.colorType(), &fSrcPtr);
121
122 if (fSource.colorType() == kAlpha_8_SkColorType) {
123 // The color for A8 images comes from the (sRGB) paint color.
124 p.append_set_rgb(fAlloc, fPaintColor);
125 p.append(SkRasterPipeline::premul);
126 }
127 if (auto dstCS = fDst.colorSpace()) {
128 auto srcCS = fSource.colorSpace();
129 if (!srcCS || fSource.colorType() == kAlpha_8_SkColorType) {
130 // We treat untagged images as sRGB.
131 // A8 images get their r,g,b from the paint color, so they're also sRGB.
132 srcCS = sk_srgb_singleton();
133 }
134 auto srcAT = fSource.isOpaque() ? kOpaque_SkAlphaType
135 : kPremul_SkAlphaType;
136 fAlloc->make<SkColorSpaceXformSteps>(srcCS, srcAT,
137 dstCS, kPremul_SkAlphaType)
138 ->apply(&p);
139 }
140 if (fPaintColor.fA != 1.0f) {
141 p.append(SkRasterPipeline::scale_1_float, &fPaintColor.fA);
142 }
143
144 bool is_opaque = fSource.isOpaque() && fPaintColor.fA == 1.0f;
145 fBlitter = SkCreateRasterPipelineBlitter(fDst, paint, p, is_opaque, fAlloc, fClipShader);
146 return fBlitter != nullptr;
147 }
148
149 void blitRect(int x, int y, int width, int height) override {
150 fSrcPtr.stride = fSource.rowBytesAsPixels();
151
152 // We really want fSrcPtr.pixels = fSource.addr(-fLeft, -fTop) here, but that asserts.
153 // Instead we ask for addr(-fLeft+x, -fTop+y), then back up (x,y) manually.
154 // Representing bpp as a size_t keeps all this math in size_t instead of int,
155 // which could wrap around with large enough fSrcPtr.stride and y.
156 size_t bpp = fSource.info().bytesPerPixel();
157 fSrcPtr.pixels = (char*)fSource.addr(-fLeft+x, -fTop+y) - bpp * x
158 - bpp * y * fSrcPtr.stride;
159
160 fBlitter->blitRect(x,y,width,height);
161 }
162
163private:
164 SkArenaAlloc* fAlloc;
165 SkBlitter* fBlitter;
166 SkRasterPipeline_MemoryCtx fSrcPtr;
167 SkColor4f fPaintColor;
168 sk_sp<SkShader> fClipShader;
169
170 typedef SkSpriteBlitter INHERITED;
171};
172
173// returning null means the caller will call SkBlitter::Choose() and
174// have wrapped the source bitmap inside a shader
175SkBlitter* SkBlitter::ChooseSprite(const SkPixmap& dst, const SkPaint& paint,
176 const SkPixmap& source, int left, int top,
177 SkArenaAlloc* alloc, sk_sp<SkShader> clipShader) {
178 /* We currently ignore antialiasing and filtertype, meaning we will take our
179 special blitters regardless of these settings. Ignoring filtertype seems fine
180 since by definition there is no scale in the matrix. Ignoring antialiasing is
181 a bit of a hack, since we "could" pass in the fractional left/top for the bitmap,
182 and respect that by blending the edges of the bitmap against the device. To support
183 this we could either add more special blitters here, or detect antialiasing in the
184 paint and return null if it is set, forcing the client to take the slow shader case
185 (which does respect soft edges).
186 */
187 SkASSERT(alloc != nullptr);
188
189 if (gUseSkVMBlitter) {
190 return SkCreateSkVMSpriteBlitter(dst, paint, source,left,top, alloc, std::move(clipShader));
191 }
192
193 // TODO: in principle SkRasterPipelineSpriteBlitter could be made to handle this.
194 if (source.alphaType() == kUnpremul_SkAlphaType) {
195 return nullptr;
196 }
197
198 SkSpriteBlitter* blitter = nullptr;
199
200 if (0 == SkColorSpaceXformSteps(source,dst).flags.mask() && !clipShader) {
201 if (!blitter && SkSpriteBlitter_Memcpy::Supports(dst, source, paint)) {
202 blitter = alloc->make<SkSpriteBlitter_Memcpy>(source);
203 }
204 if (!blitter) {
205 switch (dst.colorType()) {
206 case kN32_SkColorType:
207 blitter = SkSpriteBlitter::ChooseL32(source, paint, alloc);
208 break;
209 case kRGB_565_SkColorType:
210 blitter = SkSpriteBlitter::ChooseL565(source, paint, alloc);
211 break;
212 case kAlpha_8_SkColorType:
213 blitter = SkSpriteBlitter::ChooseLA8(source, paint, alloc);
214 break;
215 default:
216 break;
217 }
218 }
219 }
220 if (!blitter && !paint.getMaskFilter()) {
221 blitter = alloc->make<SkRasterPipelineSpriteBlitter>(source, alloc, clipShader);
222 }
223
224 if (blitter && blitter->setup(dst, left,top, paint)) {
225 return blitter;
226 }
227
228 return SkCreateSkVMSpriteBlitter(dst, paint, source,left,top, alloc, std::move(clipShader));
229}
230