Line data Source code
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 "SkBitmapProcShader.h"
9 :
10 : #include "SkArenaAlloc.h"
11 : #include "SkBitmapProcState.h"
12 : #include "SkBitmapProvider.h"
13 : #include "SkXfermodePriv.h"
14 :
15 17 : static bool only_scale_and_translate(const SkMatrix& matrix) {
16 17 : unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask;
17 17 : return (matrix.getType() & ~mask) == 0;
18 : }
19 :
20 141 : class BitmapProcInfoContext : public SkShader::Context {
21 : public:
22 : // The info has been allocated elsewhere, but we are responsible for calling its destructor.
23 141 : BitmapProcInfoContext(const SkShader& shader, const SkShader::ContextRec& rec,
24 : SkBitmapProcInfo* info)
25 141 : : INHERITED(shader, rec)
26 141 : , fInfo(info)
27 : {
28 141 : fFlags = 0;
29 141 : if (fInfo->fPixmap.isOpaque() && (255 == this->getPaintAlpha())) {
30 29 : fFlags |= SkShader::kOpaqueAlpha_Flag;
31 : }
32 :
33 141 : if (1 == fInfo->fPixmap.height() && only_scale_and_translate(this->getTotalInverse())) {
34 17 : fFlags |= SkShader::kConstInY32_Flag;
35 : }
36 141 : }
37 :
38 2337 : uint32_t getFlags() const override { return fFlags; }
39 :
40 : private:
41 : SkBitmapProcInfo* fInfo;
42 : uint32_t fFlags;
43 :
44 : typedef SkShader::Context INHERITED;
45 : };
46 :
47 : ///////////////////////////////////////////////////////////////////////////////////////////////////
48 :
49 141 : class BitmapProcShaderContext : public BitmapProcInfoContext {
50 : public:
51 141 : BitmapProcShaderContext(const SkShader& shader, const SkShader::ContextRec& rec,
52 : SkBitmapProcState* state)
53 141 : : INHERITED(shader, rec, state)
54 141 : , fState(state)
55 141 : {}
56 :
57 4790 : void shadeSpan(int x, int y, SkPMColor dstC[], int count) override {
58 4790 : const SkBitmapProcState& state = *fState;
59 4790 : if (state.getShaderProc32()) {
60 2936 : state.getShaderProc32()(&state, x, y, dstC, count);
61 2936 : return;
62 : }
63 :
64 1854 : const int BUF_MAX = 128;
65 : uint32_t buffer[BUF_MAX];
66 1854 : SkBitmapProcState::MatrixProc mproc = state.getMatrixProc();
67 1854 : SkBitmapProcState::SampleProc32 sproc = state.getSampleProc32();
68 1854 : const int max = state.maxCountForBufferSize(sizeof(buffer[0]) * BUF_MAX);
69 :
70 1854 : SkASSERT(state.fPixmap.addr());
71 :
72 : for (;;) {
73 2070 : int n = SkTMin(count, max);
74 2070 : SkASSERT(n > 0 && n < BUF_MAX*2);
75 2070 : mproc(state, buffer, n, x, y);
76 2070 : sproc(state, buffer, n, dstC);
77 :
78 2070 : if ((count -= n) == 0) {
79 1854 : break;
80 : }
81 216 : SkASSERT(count > 0);
82 216 : x += n;
83 216 : dstC += n;
84 216 : }
85 : }
86 :
87 47 : ShadeProc asAShadeProc(void** ctx) override {
88 47 : if (fState->getShaderProc32()) {
89 47 : *ctx = fState;
90 47 : return (ShadeProc)fState->getShaderProc32();
91 : }
92 0 : return nullptr;
93 : }
94 :
95 : private:
96 : SkBitmapProcState* fState;
97 :
98 : typedef BitmapProcInfoContext INHERITED;
99 : };
100 :
101 : ///////////////////////////////////////////////////////////////////////////////////////////////////
102 : #include "SkLinearBitmapPipeline.h"
103 : #include "SkPM4f.h"
104 :
105 0 : class LinearPipelineContext : public BitmapProcInfoContext {
106 : public:
107 0 : LinearPipelineContext(const SkShader& shader, const SkShader::ContextRec& rec,
108 : SkBitmapProcInfo* info, SkArenaAlloc* alloc)
109 0 : : INHERITED(shader, rec, info), fAllocator{alloc}
110 : {
111 : // Save things off in case we need to build a blitter pipeline.
112 0 : fSrcPixmap = info->fPixmap;
113 0 : fAlpha = SkColorGetA(info->fPaintColor) / 255.0f;
114 0 : fFilterQuality = info->fFilterQuality;
115 0 : fMatrixTypeMask = info->fRealInvMatrix.getType();
116 :
117 0 : fShaderPipeline = alloc->make<SkLinearBitmapPipeline>(
118 : info->fRealInvMatrix, info->fFilterQuality,
119 : info->fTileModeX, info->fTileModeY,
120 : info->fPaintColor,
121 : info->fPixmap,
122 : fAllocator);
123 :
124 : // To implement the old shadeSpan entry-point, we need to efficiently convert our native
125 : // floats into SkPMColor. The SkXfermode::D32Procs do exactly that.
126 : //
127 0 : fSrcModeProc = SkXfermode::GetD32Proc(SkBlendMode::kSrc, 0);
128 0 : }
129 :
130 0 : void shadeSpan4f(int x, int y, SkPM4f dstC[], int count) override {
131 0 : fShaderPipeline->shadeSpan4f(x, y, dstC, count);
132 0 : }
133 :
134 0 : void shadeSpan(int x, int y, SkPMColor dstC[], int count) override {
135 0 : const int N = 128;
136 : SkPM4f tmp[N];
137 :
138 0 : while (count > 0) {
139 0 : const int n = SkTMin(count, N);
140 0 : fShaderPipeline->shadeSpan4f(x, y, tmp, n);
141 0 : fSrcModeProc(SkBlendMode::kSrc, dstC, tmp, n, nullptr);
142 0 : dstC += n;
143 0 : x += n;
144 0 : count -= n;
145 : }
146 0 : }
147 :
148 0 : bool onChooseBlitProcs(const SkImageInfo& dstInfo, BlitState* state) override {
149 0 : if ((fBlitterPipeline = SkLinearBitmapPipeline::ClonePipelineForBlitting(
150 0 : *fShaderPipeline,
151 : fMatrixTypeMask,
152 : fFilterQuality, fSrcPixmap,
153 : fAlpha, state->fMode, dstInfo, fAllocator)))
154 : {
155 0 : state->fStorage[0] = fBlitterPipeline;
156 0 : state->fBlitBW = &LinearPipelineContext::ForwardToPipeline;
157 :
158 0 : return true;
159 : }
160 :
161 0 : return false;
162 : }
163 :
164 0 : static void ForwardToPipeline(BlitState* state, int x, int y, const SkPixmap& dst, int count) {
165 0 : SkLinearBitmapPipeline* pipeline = static_cast<SkLinearBitmapPipeline*>(state->fStorage[0]);
166 0 : void* addr = dst.writable_addr32(x, y);
167 0 : pipeline->blitSpan(x, y, addr, count);
168 0 : }
169 :
170 : private:
171 : // Store the allocator from the context creation incase we are asked to build a blitter.
172 : SkArenaAlloc* fAllocator;
173 : SkLinearBitmapPipeline* fShaderPipeline;
174 : SkLinearBitmapPipeline* fBlitterPipeline;
175 : SkXfermode::D32Proc fSrcModeProc;
176 : SkPixmap fSrcPixmap;
177 : float fAlpha;
178 : SkMatrix::TypeMask fMatrixTypeMask;
179 : SkFilterQuality fFilterQuality;
180 :
181 : typedef BitmapProcInfoContext INHERITED;
182 : };
183 :
184 : ///////////////////////////////////////////////////////////////////////////////////////////////////
185 :
186 141 : static bool choose_linear_pipeline(const SkShader::ContextRec& rec, const SkImageInfo& srcInfo) {
187 : // If we get here, we can reasonably use either context, respect the caller's preference
188 : //
189 141 : bool needsPremul = srcInfo.alphaType() == kUnpremul_SkAlphaType;
190 141 : bool needsSwizzle = srcInfo.bytesPerPixel() == 4 && srcInfo.colorType() != kN32_SkColorType;
191 141 : return SkShader::ContextRec::kPM4f_DstType == rec.fPreferredDstType
192 141 : || needsPremul || needsSwizzle;
193 : }
194 :
195 0 : size_t SkBitmapProcLegacyShader::ContextSize(const ContextRec& rec, const SkImageInfo& srcInfo) {
196 0 : size_t size0 = sizeof(BitmapProcShaderContext) + sizeof(SkBitmapProcState);
197 0 : size_t size1 = sizeof(LinearPipelineContext) + sizeof(SkBitmapProcInfo);
198 0 : size_t s = SkTMax(size0, size1);
199 0 : return s;
200 : }
201 :
202 141 : SkShader::Context* SkBitmapProcLegacyShader::MakeContext(
203 : const SkShader& shader, TileMode tmx, TileMode tmy,
204 : const SkBitmapProvider& provider, const ContextRec& rec, SkArenaAlloc* alloc)
205 : {
206 : SkMatrix totalInverse;
207 : // Do this first, so we know the matrix can be inverted.
208 141 : if (!shader.computeTotalInverse(rec, &totalInverse)) {
209 0 : return nullptr;
210 : }
211 :
212 : // Decide if we can/want to use the new linear pipeline
213 141 : bool useLinearPipeline = choose_linear_pipeline(rec, provider.info());
214 :
215 141 : if (useLinearPipeline) {
216 0 : SkBitmapProcInfo* info = alloc->make<SkBitmapProcInfo>(provider, tmx, tmy);
217 0 : if (!info->init(totalInverse, *rec.fPaint)) {
218 0 : return nullptr;
219 : }
220 :
221 0 : return alloc->make<LinearPipelineContext>(shader, rec, info, alloc);
222 : } else {
223 141 : SkBitmapProcState* state = alloc->make<SkBitmapProcState>(provider, tmx, tmy);
224 141 : if (!state->setup(totalInverse, *rec.fPaint)) {
225 0 : return nullptr;
226 : }
227 141 : return alloc->make<BitmapProcShaderContext>(shader, rec, state);
228 : }
229 : }
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