1 /*
2 * Copyright 2015 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 "include/effects/SkTableColorFilter.h"
9
10 #include "include/core/SkBitmap.h"
11 #include "include/core/SkString.h"
12 #include "include/core/SkUnPreMultiply.h"
13 #include "include/private/SkColorData.h"
14 #include "include/private/SkTo.h"
15 #include "src/core/SkArenaAlloc.h"
16 #include "src/core/SkEffectPriv.h"
17 #include "src/core/SkRasterPipeline.h"
18 #include "src/core/SkReadBuffer.h"
19 #include "src/core/SkWriteBuffer.h"
20
21 static const uint8_t gIdentityTable[] = {
22 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
23 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
24 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
25 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
26 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
27 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
28 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
29 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
30 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
31 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
32 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
33 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
34 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
35 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
36 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
37 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
38 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
39 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
40 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
41 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
42 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
43 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
44 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
45 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
46 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
47 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
48 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
49 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
50 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
51 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
52 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
53 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
54 };
55
56 class SkTable_ColorFilter : public SkColorFilter {
57 public:
SkTable_ColorFilter(const uint8_t tableA[],const uint8_t tableR[],const uint8_t tableG[],const uint8_t tableB[])58 SkTable_ColorFilter(const uint8_t tableA[], const uint8_t tableR[],
59 const uint8_t tableG[], const uint8_t tableB[]) {
60 fBitmap = nullptr;
61 fFlags = 0;
62
63 uint8_t* dst = fStorage;
64 if (tableA) {
65 memcpy(dst, tableA, 256);
66 dst += 256;
67 fFlags |= kA_Flag;
68 }
69 if (tableR) {
70 memcpy(dst, tableR, 256);
71 dst += 256;
72 fFlags |= kR_Flag;
73 }
74 if (tableG) {
75 memcpy(dst, tableG, 256);
76 dst += 256;
77 fFlags |= kG_Flag;
78 }
79 if (tableB) {
80 memcpy(dst, tableB, 256);
81 fFlags |= kB_Flag;
82 }
83 }
84
~SkTable_ColorFilter()85 ~SkTable_ColorFilter() override { delete fBitmap; }
86
87 #if SK_SUPPORT_GPU
88 std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(GrRecordingContext*,
89 const GrColorInfo&) const override;
90 #endif
91
92 enum {
93 kA_Flag = 1 << 0,
94 kR_Flag = 1 << 1,
95 kG_Flag = 1 << 2,
96 kB_Flag = 1 << 3,
97 };
98
onAppendStages(const SkStageRec & rec,bool shaderIsOpaque) const99 bool onAppendStages(const SkStageRec& rec, bool shaderIsOpaque) const override {
100 const uint8_t *r = gIdentityTable,
101 *g = gIdentityTable,
102 *b = gIdentityTable,
103 *a = gIdentityTable;
104 const uint8_t* ptr = fStorage;
105 if (fFlags & kA_Flag) { a = ptr; ptr += 256; }
106 if (fFlags & kR_Flag) { r = ptr; ptr += 256; }
107 if (fFlags & kG_Flag) { g = ptr; ptr += 256; }
108 if (fFlags & kB_Flag) { b = ptr; }
109
110 SkRasterPipeline* p = rec.fPipeline;
111 if (!shaderIsOpaque) {
112 p->append(SkRasterPipeline::unpremul);
113 }
114
115 struct Tables { const uint8_t *r, *g, *b, *a; };
116 p->append(SkRasterPipeline::byte_tables, rec.fAlloc->make<Tables>(Tables{r,g,b,a}));
117
118 bool definitelyOpaque = shaderIsOpaque && a[0xff] == 0xff;
119 if (!definitelyOpaque) {
120 p->append(SkRasterPipeline::premul);
121 }
122 return true;
123 }
124
125 protected:
126 void flatten(SkWriteBuffer&) const override;
127
128 private:
129 SK_FLATTENABLE_HOOKS(SkTable_ColorFilter)
130
131 void getTableAsBitmap(SkBitmap* table) const;
132
133 mutable const SkBitmap* fBitmap; // lazily allocated
134
135 uint8_t fStorage[256 * 4];
136 unsigned fFlags;
137
138 friend class SkTableColorFilter;
139
140 typedef SkColorFilter INHERITED;
141 };
142
143 static const uint8_t gCountNibBits[] = {
144 0, 1, 1, 2,
145 1, 2, 2, 3,
146 1, 2, 2, 3,
147 2, 3, 3, 4
148 };
149
150 #include "src/effects/SkPackBits.h"
151
flatten(SkWriteBuffer & buffer) const152 void SkTable_ColorFilter::flatten(SkWriteBuffer& buffer) const {
153 uint8_t storage[5*256];
154 int count = gCountNibBits[fFlags & 0xF];
155 size_t size = SkPackBits::Pack8(fStorage, count * 256, storage,
156 sizeof(storage));
157
158 buffer.write32(fFlags);
159 buffer.writeByteArray(storage, size);
160 }
161
CreateProc(SkReadBuffer & buffer)162 sk_sp<SkFlattenable> SkTable_ColorFilter::CreateProc(SkReadBuffer& buffer) {
163 const int flags = buffer.read32();
164 const size_t count = gCountNibBits[flags & 0xF];
165 SkASSERT(count <= 4);
166
167 uint8_t packedStorage[5*256];
168 size_t packedSize = buffer.getArrayCount();
169 if (!buffer.validate(packedSize <= sizeof(packedStorage))) {
170 return nullptr;
171 }
172 if (!buffer.readByteArray(packedStorage, packedSize)) {
173 return nullptr;
174 }
175
176 uint8_t unpackedStorage[4*256];
177 size_t unpackedSize = SkPackBits::Unpack8(packedStorage, packedSize,
178 unpackedStorage, sizeof(unpackedStorage));
179 // now check that we got the size we expected
180 if (!buffer.validate(unpackedSize == count*256)) {
181 return nullptr;
182 }
183
184 const uint8_t* a = nullptr;
185 const uint8_t* r = nullptr;
186 const uint8_t* g = nullptr;
187 const uint8_t* b = nullptr;
188 const uint8_t* ptr = unpackedStorage;
189
190 if (flags & kA_Flag) {
191 a = ptr;
192 ptr += 256;
193 }
194 if (flags & kR_Flag) {
195 r = ptr;
196 ptr += 256;
197 }
198 if (flags & kG_Flag) {
199 g = ptr;
200 ptr += 256;
201 }
202 if (flags & kB_Flag) {
203 b = ptr;
204 ptr += 256;
205 }
206 return SkTableColorFilter::MakeARGB(a, r, g, b);
207 }
208
getTableAsBitmap(SkBitmap * table) const209 void SkTable_ColorFilter::getTableAsBitmap(SkBitmap* table) const {
210 if (table) {
211 if (nullptr == fBitmap) {
212 SkBitmap* bmp = new SkBitmap;
213 bmp->allocPixels(SkImageInfo::MakeA8(256, 4));
214 uint8_t* bitmapPixels = bmp->getAddr8(0, 0);
215 int offset = 0;
216 static const unsigned kFlags[] = { kA_Flag, kR_Flag, kG_Flag, kB_Flag };
217
218 for (int x = 0; x < 4; ++x) {
219 if (!(fFlags & kFlags[x])) {
220 memcpy(bitmapPixels, gIdentityTable, sizeof(gIdentityTable));
221 } else {
222 memcpy(bitmapPixels, fStorage + offset, 256);
223 offset += 256;
224 }
225 bitmapPixels += 256;
226 }
227 bmp->setImmutable();
228 fBitmap = bmp;
229 }
230 *table = *fBitmap;
231 }
232 }
233
234 #if SK_SUPPORT_GPU
235
236 #include "include/private/GrRecordingContext.h"
237 #include "src/gpu/GrColorInfo.h"
238 #include "src/gpu/GrFragmentProcessor.h"
239 #include "src/gpu/GrRecordingContextPriv.h"
240 #include "src/gpu/SkGr.h"
241 #include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
242 #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
243 #include "src/gpu/glsl/GrGLSLProgramDataManager.h"
244 #include "src/gpu/glsl/GrGLSLUniformHandler.h"
245
246 class ColorTableEffect : public GrFragmentProcessor {
247 public:
248 static std::unique_ptr<GrFragmentProcessor> Make(GrRecordingContext* context,
249 const SkBitmap& bitmap);
250
~ColorTableEffect()251 ~ColorTableEffect() override {}
252
name() const253 const char* name() const override { return "ColorTableEffect"; }
254
clone() const255 std::unique_ptr<GrFragmentProcessor> clone() const override {
256 return std::unique_ptr<GrFragmentProcessor>(
257 new ColorTableEffect(sk_ref_sp(fTextureSampler.proxy())));
258 }
259
260 private:
261 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
262
263 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
264
onIsEqual(const GrFragmentProcessor &) const265 bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
266
ColorTableEffect(sk_sp<GrTextureProxy> proxy)267 ColorTableEffect(sk_sp<GrTextureProxy> proxy)
268 : INHERITED(kColorTableEffect_ClassID,
269 kNone_OptimizationFlags) // Not bothering with table-specific optimizations.
270 , fTextureSampler(std::move(proxy)) {
271 this->setTextureSamplerCnt(1);
272 }
273
onTextureSampler(int) const274 const TextureSampler& onTextureSampler(int) const override { return fTextureSampler; }
275
276 GR_DECLARE_FRAGMENT_PROCESSOR_TEST
277
278 TextureSampler fTextureSampler;
279
280 typedef GrFragmentProcessor INHERITED;
281 };
282
283 class GLColorTableEffect : public GrGLSLFragmentProcessor {
284 public:
285 void emitCode(EmitArgs&) override;
286
GenKey(const GrProcessor &,const GrShaderCaps &,GrProcessorKeyBuilder *)287 static void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*) {}
288
289 private:
290 typedef GrGLSLFragmentProcessor INHERITED;
291 };
292
emitCode(EmitArgs & args)293 void GLColorTableEffect::emitCode(EmitArgs& args) {
294 static const float kColorScaleFactor = 255.0f / 256.0f;
295 static const float kColorOffsetFactor = 1.0f / 512.0f;
296 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
297 if (nullptr == args.fInputColor) {
298 // the input color is solid white (all ones).
299 static const float kMaxValue = kColorScaleFactor + kColorOffsetFactor;
300 fragBuilder->codeAppendf("\t\thalf4 coord = half4(%f, %f, %f, %f);\n",
301 kMaxValue, kMaxValue, kMaxValue, kMaxValue);
302
303 } else {
304 fragBuilder->codeAppendf("\t\thalf nonZeroAlpha = max(%s.a, .0001);\n", args.fInputColor);
305 fragBuilder->codeAppendf("\t\thalf4 coord = half4(%s.rgb / nonZeroAlpha, nonZeroAlpha);\n",
306 args.fInputColor);
307 fragBuilder->codeAppendf("\t\tcoord = coord * %f + half4(%f, %f, %f, %f);\n",
308 kColorScaleFactor,
309 kColorOffsetFactor, kColorOffsetFactor,
310 kColorOffsetFactor, kColorOffsetFactor);
311 }
312
313 SkString coord;
314
315 fragBuilder->codeAppendf("\t\t%s.a = ", args.fOutputColor);
316 coord.printf("half2(coord.a, 0.125)");
317 fragBuilder->appendTextureLookup(args.fTexSamplers[0], coord.c_str());
318 fragBuilder->codeAppend(".a;\n");
319
320 fragBuilder->codeAppendf("\t\t%s.r = ", args.fOutputColor);
321 coord.printf("half2(coord.r, 0.375)");
322 fragBuilder->appendTextureLookup(args.fTexSamplers[0], coord.c_str());
323 fragBuilder->codeAppend(".a;\n");
324
325 fragBuilder->codeAppendf("\t\t%s.g = ", args.fOutputColor);
326 coord.printf("half2(coord.g, 0.625)");
327 fragBuilder->appendTextureLookup(args.fTexSamplers[0], coord.c_str());
328 fragBuilder->codeAppend(".a;\n");
329
330 fragBuilder->codeAppendf("\t\t%s.b = ", args.fOutputColor);
331 coord.printf("half2(coord.b, 0.875)");
332 fragBuilder->appendTextureLookup(args.fTexSamplers[0], coord.c_str());
333 fragBuilder->codeAppend(".a;\n");
334
335 fragBuilder->codeAppendf("\t\t%s.rgb *= %s.a;\n", args.fOutputColor, args.fOutputColor);
336 }
337
338 ///////////////////////////////////////////////////////////////////////////////
Make(GrRecordingContext * context,const SkBitmap & bitmap)339 std::unique_ptr<GrFragmentProcessor> ColorTableEffect::Make(GrRecordingContext* context,
340 const SkBitmap& bitmap) {
341 SkASSERT(kPremul_SkAlphaType == bitmap.alphaType());
342 SkASSERT(bitmap.isImmutable());
343
344 if (kUnknown_GrPixelConfig == SkColorType2GrPixelConfig(bitmap.colorType())) {
345 return nullptr;
346 }
347
348 sk_sp<SkImage> srcImage = SkImage::MakeFromBitmap(bitmap);
349 if (!srcImage) {
350 return nullptr;
351 }
352
353 sk_sp<GrTextureProxy> proxy = GrMakeCachedImageProxy(context->priv().proxyProvider(),
354 std::move(srcImage));
355 if (!proxy) {
356 return nullptr;
357 }
358
359 return std::unique_ptr<GrFragmentProcessor>(new ColorTableEffect(std::move(proxy)));
360 }
361
onGetGLSLProcessorKey(const GrShaderCaps & caps,GrProcessorKeyBuilder * b) const362 void ColorTableEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
363 GrProcessorKeyBuilder* b) const {
364 GLColorTableEffect::GenKey(*this, caps, b);
365 }
366
onCreateGLSLInstance() const367 GrGLSLFragmentProcessor* ColorTableEffect::onCreateGLSLInstance() const {
368 return new GLColorTableEffect;
369 }
370
371 ///////////////////////////////////////////////////////////////////////////////
372
373 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(ColorTableEffect);
374
375 #if GR_TEST_UTILS
376
377 #include "include/gpu/GrContext.h"
378
TestCreate(GrProcessorTestData * d)379 std::unique_ptr<GrFragmentProcessor> ColorTableEffect::TestCreate(GrProcessorTestData* d) {
380 int flags = 0;
381 uint8_t luts[256][4];
382 do {
383 for (int i = 0; i < 4; ++i) {
384 flags |= d->fRandom->nextBool() ? (1 << i): 0;
385 }
386 } while (!flags);
387 for (int i = 0; i < 4; ++i) {
388 if (flags & (1 << i)) {
389 for (int j = 0; j < 256; ++j) {
390 luts[j][i] = SkToU8(d->fRandom->nextBits(8));
391 }
392 }
393 }
394 auto filter(SkTableColorFilter::MakeARGB(
395 (flags & (1 << 0)) ? luts[0] : nullptr,
396 (flags & (1 << 1)) ? luts[1] : nullptr,
397 (flags & (1 << 2)) ? luts[2] : nullptr,
398 (flags & (1 << 3)) ? luts[3] : nullptr
399 ));
400 sk_sp<SkColorSpace> colorSpace = GrTest::TestColorSpace(d->fRandom);
401 auto fp = filter->asFragmentProcessor(
402 d->context(),
403 GrColorInfo(GrColorType::kRGBA_8888, kUnknown_SkAlphaType, std::move(colorSpace)));
404 SkASSERT(fp);
405 return fp;
406 }
407 #endif
408
asFragmentProcessor(GrRecordingContext * context,const GrColorInfo &) const409 std::unique_ptr<GrFragmentProcessor> SkTable_ColorFilter::asFragmentProcessor(
410 GrRecordingContext* context, const GrColorInfo&) const {
411 SkBitmap bitmap;
412 this->getTableAsBitmap(&bitmap);
413
414 return ColorTableEffect::Make(context, bitmap);
415 }
416
417 #endif // SK_SUPPORT_GPU
418
419 ///////////////////////////////////////////////////////////////////////////////
420
Make(const uint8_t table[256])421 sk_sp<SkColorFilter> SkTableColorFilter::Make(const uint8_t table[256]) {
422 return sk_make_sp<SkTable_ColorFilter>(table, table, table, table);
423 }
424
MakeARGB(const uint8_t tableA[256],const uint8_t tableR[256],const uint8_t tableG[256],const uint8_t tableB[256])425 sk_sp<SkColorFilter> SkTableColorFilter::MakeARGB(const uint8_t tableA[256],
426 const uint8_t tableR[256],
427 const uint8_t tableG[256],
428 const uint8_t tableB[256]) {
429 return sk_make_sp<SkTable_ColorFilter>(tableA, tableR, tableG, tableB);
430 }
431
RegisterFlattenables()432 void SkTableColorFilter::RegisterFlattenables() { SK_REGISTER_FLATTENABLE(SkTable_ColorFilter); }
433