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