2 * Copyright 2006 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #include "SkGradientShaderPriv.h"
9 #include "SkLinearGradient.h"
10 #include "SkRadialGradient.h"
11 #include "SkTwoPointRadialGradient.h"
12 #include "SkTwoPointConicalGradient.h"
13 #include "SkSweepGradient.h"
15 SkGradientShaderBase::SkGradientShaderBase(const Descriptor& desc) {
16 SkASSERT(desc.fCount > 1);
18 fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return
20 fMapper = desc.fMapper;
22 fGradFlags = SkToU8(desc.fFlags);
24 SkASSERT((unsigned)desc.fTileMode < SkShader::kTileModeCount);
25 SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs));
26 fTileMode = desc.fTileMode;
27 fTileProc = gTileProcs[desc.fTileMode];
29 fCache16 = fCache16Storage = NULL;
31 fCache32PixelRef = NULL;
33 /* Note: we let the caller skip the first and/or last position.
34 i.e. pos[0] = 0.3, pos[1] = 0.7
35 In these cases, we insert dummy entries to ensure that the final data
36 will be bracketed by [0, 1].
37 i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1
39 Thus colorCount (the caller's value, and fColorCount (our value) may
40 differ by up to 2. In the above example:
44 fColorCount = desc.fCount;
45 // check if we need to add in dummy start and/or end position/colors
46 bool dummyFirst = false;
47 bool dummyLast = false;
49 dummyFirst = desc.fPos[0] != 0;
50 dummyLast = desc.fPos[desc.fCount - 1] != SK_Scalar1;
51 fColorCount += dummyFirst + dummyLast;
54 if (fColorCount > kColorStorageCount) {
55 size_t size = sizeof(SkColor) + sizeof(Rec);
56 fOrigColors = reinterpret_cast<SkColor*>(
57 sk_malloc_throw(size * fColorCount));
60 fOrigColors = fStorage;
63 // Now copy over the colors, adding the dummies as needed
65 SkColor* origColors = fOrigColors;
67 *origColors++ = desc.fColors[0];
69 memcpy(origColors, desc.fColors, desc.fCount * sizeof(SkColor));
71 origColors += desc.fCount;
72 *origColors = desc.fColors[desc.fCount - 1];
76 fRecs = (Rec*)(fOrigColors + fColorCount);
77 if (fColorCount > 2) {
80 // recs->fScale = 0; // unused;
83 /* We need to convert the user's array of relative positions into
84 fixed-point positions and scale factors. We need these results
85 to be strictly monotonic (no two values equal or out of order).
86 Hence this complex loop that just jams a zero for the scale
87 value if it sees a segment out of order, and it assures that
88 we start at 0 and end at 1.0
91 int startIndex = dummyFirst ? 0 : 1;
92 int count = desc.fCount + dummyLast;
93 for (int i = startIndex; i < count; i++) {
94 // force the last value to be 1.0
96 if (i == desc.fCount) { // we're really at the dummyLast
99 curr = SkScalarToFixed(desc.fPos[i]);
101 // pin curr withing range
104 } else if (curr > SK_Fixed1) {
109 recs->fScale = (1 << 24) / (curr - prev);
111 recs->fScale = 0; // ignore this segment
113 // get ready for the next value
117 } else { // assume even distribution
118 SkFixed dp = SK_Fixed1 / (desc.fCount - 1);
120 SkFixed scale = (desc.fCount - 1) << 8; // (1 << 24) / dp
121 for (int i = 1; i < desc.fCount; i++) {
123 recs->fScale = scale;
132 static uint32_t pack_mode_flags(SkShader::TileMode mode, uint32_t flags) {
133 SkASSERT(0 == (flags >> 28));
134 SkASSERT(0 == ((uint32_t)mode >> 4));
135 return (flags << 4) | mode;
138 static SkShader::TileMode unpack_mode(uint32_t packed) {
139 return (SkShader::TileMode)(packed & 0xF);
142 static uint32_t unpack_flags(uint32_t packed) {
146 SkGradientShaderBase::SkGradientShaderBase(SkReadBuffer& buffer) : INHERITED(buffer) {
149 fMapper = buffer.readUnitMapper();
151 fCache16 = fCache16Storage = NULL;
153 fCache32PixelRef = NULL;
155 int colorCount = fColorCount = buffer.getArrayCount();
156 if (colorCount > kColorStorageCount) {
157 size_t allocSize = (sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec)) * colorCount;
158 if (buffer.validateAvailable(allocSize)) {
159 fOrigColors = reinterpret_cast<SkColor*>(sk_malloc_throw(allocSize));
162 colorCount = fColorCount = 0;
165 fOrigColors = fStorage;
167 buffer.readColorArray(fOrigColors, colorCount);
170 uint32_t packed = buffer.readUInt();
171 fGradFlags = SkToU8(unpack_flags(packed));
172 fTileMode = unpack_mode(packed);
174 fTileProc = gTileProcs[fTileMode];
175 fRecs = (Rec*)(fOrigColors + colorCount);
176 if (colorCount > 2) {
179 for (int i = 1; i < colorCount; i++) {
180 recs[i].fPos = buffer.readInt();
181 recs[i].fScale = buffer.readUInt();
184 buffer.readMatrix(&fPtsToUnit);
188 SkGradientShaderBase::~SkGradientShaderBase() {
189 if (fCache16Storage) {
190 sk_free(fCache16Storage);
192 SkSafeUnref(fCache32PixelRef);
193 if (fOrigColors != fStorage) {
194 sk_free(fOrigColors);
196 SkSafeUnref(fMapper);
199 void SkGradientShaderBase::initCommon() {
201 unsigned colorAlpha = 0xFF;
202 for (int i = 0; i < fColorCount; i++) {
203 colorAlpha &= SkColorGetA(fOrigColors[i]);
205 fColorsAreOpaque = colorAlpha == 0xFF;
208 void SkGradientShaderBase::flatten(SkWriteBuffer& buffer) const {
209 this->INHERITED::flatten(buffer);
210 buffer.writeFlattenable(fMapper);
211 buffer.writeColorArray(fOrigColors, fColorCount);
212 buffer.writeUInt(pack_mode_flags(fTileMode, fGradFlags));
213 if (fColorCount > 2) {
215 for (int i = 1; i < fColorCount; i++) {
216 buffer.writeInt(recs[i].fPos);
217 buffer.writeUInt(recs[i].fScale);
220 buffer.writeMatrix(fPtsToUnit);
223 bool SkGradientShaderBase::isOpaque() const {
224 return fColorsAreOpaque;
227 bool SkGradientShaderBase::setContext(const SkBitmap& device,
228 const SkPaint& paint,
229 const SkMatrix& matrix) {
230 if (!this->INHERITED::setContext(device, paint, matrix)) {
234 const SkMatrix& inverse = this->getTotalInverse();
236 fDstToIndex.setConcat(fPtsToUnit, inverse);
237 fDstToIndexProc = fDstToIndex.getMapXYProc();
238 fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex);
240 // now convert our colors in to PMColors
241 unsigned paintAlpha = this->getPaintAlpha();
243 fFlags = this->INHERITED::getFlags();
244 if (fColorsAreOpaque && paintAlpha == 0xFF) {
245 fFlags |= kOpaqueAlpha_Flag;
247 // we can do span16 as long as our individual colors are opaque,
248 // regardless of the paint's alpha
249 if (fColorsAreOpaque) {
250 fFlags |= kHasSpan16_Flag;
253 this->setCacheAlpha(paintAlpha);
257 void SkGradientShaderBase::setCacheAlpha(U8CPU alpha) const {
258 // if the new alpha differs from the previous time we were called, inval our cache
259 // this will trigger the cache to be rebuilt.
260 // we don't care about the first time, since the cache ptrs will already be NULL
261 if (fCacheAlpha != alpha) {
262 fCache16 = NULL; // inval the cache
263 fCache32 = NULL; // inval the cache
264 fCacheAlpha = alpha; // record the new alpha
265 // inform our subclasses
266 if (fCache32PixelRef) {
267 fCache32PixelRef->notifyPixelsChanged();
272 #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8)
274 /** We take the original colors, not our premultiplied PMColors, since we can
275 build a 16bit table as long as the original colors are opaque, even if the
276 paint specifies a non-opaque alpha.
278 void SkGradientShaderBase::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1,
281 SkASSERT(SkColorGetA(c0) == 0xFF);
282 SkASSERT(SkColorGetA(c1) == 0xFF);
284 SkFixed r = SkColorGetR(c0);
285 SkFixed g = SkColorGetG(c0);
286 SkFixed b = SkColorGetB(c0);
288 SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1);
289 SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1);
290 SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1);
292 r = SkIntToFixed(r) + 0x8000;
293 g = SkIntToFixed(g) + 0x8000;
294 b = SkIntToFixed(b) + 0x8000;
297 unsigned rr = r >> 16;
298 unsigned gg = g >> 16;
299 unsigned bb = b >> 16;
300 cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb));
301 cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb);
306 } while (--count != 0);
310 * r,g,b used to be SkFixed, but on gcc (4.2.1 mac and 4.6.3 goobuntu) in
311 * release builds, we saw a compiler error where the 0xFF parameter in
312 * SkPackARGB32() was being totally ignored whenever it was called with
313 * a non-zero add (e.g. 0x8000).
315 * We found two work-arounds:
316 * 1. change r,g,b to unsigned (or just one of them)
317 * 2. change SkPackARGB32 to + its (a << SK_A32_SHIFT) value instead
320 * We chose #1 just because it was more localized.
321 * See http://code.google.com/p/skia/issues/detail?id=1113
323 * The type SkUFixed encapsulate this need for unsigned, but logically Fixed.
325 typedef uint32_t SkUFixed;
327 void SkGradientShaderBase::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1,
328 int count, U8CPU paintAlpha, uint32_t gradFlags) {
331 // need to apply paintAlpha to our two endpoints
332 uint32_t a0 = SkMulDiv255Round(SkColorGetA(c0), paintAlpha);
333 uint32_t a1 = SkMulDiv255Round(SkColorGetA(c1), paintAlpha);
336 const bool interpInPremul = SkToBool(gradFlags &
337 SkGradientShader::kInterpolateColorsInPremul_Flag);
339 uint32_t r0 = SkColorGetR(c0);
340 uint32_t g0 = SkColorGetG(c0);
341 uint32_t b0 = SkColorGetB(c0);
343 uint32_t r1 = SkColorGetR(c1);
344 uint32_t g1 = SkColorGetG(c1);
345 uint32_t b1 = SkColorGetB(c1);
347 if (interpInPremul) {
348 r0 = SkMulDiv255Round(r0, a0);
349 g0 = SkMulDiv255Round(g0, a0);
350 b0 = SkMulDiv255Round(b0, a0);
352 r1 = SkMulDiv255Round(r1, a1);
353 g1 = SkMulDiv255Round(g1, a1);
354 b1 = SkMulDiv255Round(b1, a1);
357 SkFixed da = SkIntToFixed(a1 - a0) / (count - 1);
358 SkFixed dr = SkIntToFixed(r1 - r0) / (count - 1);
359 SkFixed dg = SkIntToFixed(g1 - g0) / (count - 1);
360 SkFixed db = SkIntToFixed(b1 - b0) / (count - 1);
362 /* We pre-add 1/8 to avoid having to add this to our [0] value each time
363 in the loop. Without this, the bias for each would be
364 0x2000 0xA000 0xE000 0x6000
365 With this trick, we can add 0 for the first (no-op) and just adjust the
368 SkUFixed a = SkIntToFixed(a0) + 0x2000;
369 SkUFixed r = SkIntToFixed(r0) + 0x2000;
370 SkUFixed g = SkIntToFixed(g0) + 0x2000;
371 SkUFixed b = SkIntToFixed(b0) + 0x2000;
374 * Our dither-cell (spatially) is
378 * [0] -> [-1/8 ... 1/8 ) values near 0
379 * [1] -> [ 1/8 ... 3/8 ) values near 1/4
380 * [2] -> [ 3/8 ... 5/8 ) values near 1/2
381 * [3] -> [ 5/8 ... 7/8 ) values near 3/4
384 if (0xFF == a0 && 0 == da) {
386 cache[kCache32Count*0] = SkPackARGB32(0xFF, (r + 0 ) >> 16,
389 cache[kCache32Count*1] = SkPackARGB32(0xFF, (r + 0x8000) >> 16,
392 cache[kCache32Count*2] = SkPackARGB32(0xFF, (r + 0xC000) >> 16,
395 cache[kCache32Count*3] = SkPackARGB32(0xFF, (r + 0x4000) >> 16,
402 } while (--count != 0);
403 } else if (interpInPremul) {
405 cache[kCache32Count*0] = SkPackARGB32((a + 0 ) >> 16,
409 cache[kCache32Count*1] = SkPackARGB32((a + 0x8000) >> 16,
413 cache[kCache32Count*2] = SkPackARGB32((a + 0xC000) >> 16,
417 cache[kCache32Count*3] = SkPackARGB32((a + 0x4000) >> 16,
426 } while (--count != 0);
427 } else { // interpolate in unpreml space
429 cache[kCache32Count*0] = SkPremultiplyARGBInline((a + 0 ) >> 16,
433 cache[kCache32Count*1] = SkPremultiplyARGBInline((a + 0x8000) >> 16,
437 cache[kCache32Count*2] = SkPremultiplyARGBInline((a + 0xC000) >> 16,
441 cache[kCache32Count*3] = SkPremultiplyARGBInline((a + 0x4000) >> 16,
450 } while (--count != 0);
454 static inline int SkFixedToFFFF(SkFixed x) {
455 SkASSERT((unsigned)x <= SK_Fixed1);
456 return x - (x >> 16);
459 static inline U16CPU bitsTo16(unsigned x, const unsigned bits) {
460 SkASSERT(x < (1U << bits));
462 return (x << 10) | (x << 4) | (x >> 2);
471 const uint16_t* SkGradientShaderBase::getCache16() const {
472 if (fCache16 == NULL) {
473 // double the count for dither entries
474 const int entryCount = kCache16Count * 2;
475 const size_t allocSize = sizeof(uint16_t) * entryCount;
477 if (fCache16Storage == NULL) { // set the storage and our working ptr
478 fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize);
480 fCache16 = fCache16Storage;
481 if (fColorCount == 2) {
482 Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1],
487 for (int i = 1; i < fColorCount; i++) {
488 int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift;
489 SkASSERT(nextIndex < kCache16Count);
491 if (nextIndex > prevIndex)
492 Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1);
493 prevIndex = nextIndex;
498 fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize);
499 uint16_t* linear = fCache16; // just computed linear data
500 uint16_t* mapped = fCache16Storage; // storage for mapped data
501 SkUnitMapper* map = fMapper;
502 for (int i = 0; i < kCache16Count; i++) {
503 int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift;
504 mapped[i] = linear[index];
505 mapped[i + kCache16Count] = linear[index + kCache16Count];
508 fCache16 = fCache16Storage;
514 const SkPMColor* SkGradientShaderBase::getCache32() const {
515 if (fCache32 == NULL) {
517 info.fWidth = kCache32Count;
518 info.fHeight = 4; // for our 4 dither rows
519 info.fAlphaType = kPremul_SkAlphaType;
520 info.fColorType = kPMColor_SkColorType;
522 if (NULL == fCache32PixelRef) {
523 fCache32PixelRef = SkMallocPixelRef::NewAllocate(info, 0, NULL);
525 fCache32 = (SkPMColor*)fCache32PixelRef->getAddr();
526 if (fColorCount == 2) {
527 Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1],
528 kCache32Count, fCacheAlpha, fGradFlags);
532 for (int i = 1; i < fColorCount; i++) {
533 int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache32Shift;
534 SkASSERT(nextIndex < kCache32Count);
536 if (nextIndex > prevIndex)
537 Build32bitCache(fCache32 + prevIndex, fOrigColors[i-1],
538 fOrigColors[i], nextIndex - prevIndex + 1,
539 fCacheAlpha, fGradFlags);
540 prevIndex = nextIndex;
545 SkMallocPixelRef* newPR = SkMallocPixelRef::NewAllocate(info, 0, NULL);
546 SkPMColor* linear = fCache32; // just computed linear data
547 SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data
548 SkUnitMapper* map = fMapper;
549 for (int i = 0; i < kCache32Count; i++) {
550 int index = map->mapUnit16((i << 8) | i) >> 8;
551 mapped[i + kCache32Count*0] = linear[index + kCache32Count*0];
552 mapped[i + kCache32Count*1] = linear[index + kCache32Count*1];
553 mapped[i + kCache32Count*2] = linear[index + kCache32Count*2];
554 mapped[i + kCache32Count*3] = linear[index + kCache32Count*3];
556 fCache32PixelRef->unref();
557 fCache32PixelRef = newPR;
558 fCache32 = (SkPMColor*)newPR->getAddr();
565 * Because our caller might rebuild the same (logically the same) gradient
566 * over and over, we'd like to return exactly the same "bitmap" if possible,
567 * allowing the client to utilize a cache of our bitmap (e.g. with a GPU).
568 * To do that, we maintain a private cache of built-bitmaps, based on our
569 * colors and positions. Note: we don't try to flatten the fMapper, so if one
570 * is present, we skip the cache for now.
572 void SkGradientShaderBase::getGradientTableBitmap(SkBitmap* bitmap) const {
573 // our caller assumes no external alpha, so we ensure that our cache is
575 this->setCacheAlpha(0xFF);
577 // don't have a way to put the mapper into our cache-key yet
579 // force our cahce32pixelref to be built
580 (void)this->getCache32();
581 bitmap->setConfig(SkImageInfo::MakeN32Premul(kCache32Count, 1));
582 bitmap->setPixelRef(fCache32PixelRef);
586 // build our key: [numColors + colors[] + {positions[]} + flags ]
587 int count = 1 + fColorCount + 1;
588 if (fColorCount > 2) {
589 count += fColorCount - 1; // fRecs[].fPos
592 SkAutoSTMalloc<16, int32_t> storage(count);
593 int32_t* buffer = storage.get();
595 *buffer++ = fColorCount;
596 memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor));
597 buffer += fColorCount;
598 if (fColorCount > 2) {
599 for (int i = 1; i < fColorCount; i++) {
600 *buffer++ = fRecs[i].fPos;
603 *buffer++ = fGradFlags;
604 SkASSERT(buffer - storage.get() == count);
606 ///////////////////////////////////
608 SK_DECLARE_STATIC_MUTEX(gMutex);
609 static SkBitmapCache* gCache;
610 // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp
611 static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32;
612 SkAutoMutexAcquire ama(gMutex);
614 if (NULL == gCache) {
615 gCache = SkNEW_ARGS(SkBitmapCache, (MAX_NUM_CACHED_GRADIENT_BITMAPS));
617 size_t size = count * sizeof(int32_t);
619 if (!gCache->find(storage.get(), size, bitmap)) {
620 // force our cahce32pixelref to be built
621 (void)this->getCache32();
622 bitmap->setConfig(SkImageInfo::MakeN32Premul(kCache32Count, 1));
623 bitmap->setPixelRef(fCache32PixelRef);
625 gCache->add(storage.get(), size, *bitmap);
629 void SkGradientShaderBase::commonAsAGradient(GradientInfo* info) const {
631 if (info->fColorCount >= fColorCount) {
633 memcpy(info->fColors, fOrigColors, fColorCount * sizeof(SkColor));
635 if (info->fColorOffsets) {
636 if (fColorCount == 2) {
637 info->fColorOffsets[0] = 0;
638 info->fColorOffsets[1] = SK_Scalar1;
639 } else if (fColorCount > 2) {
640 for (int i = 0; i < fColorCount; ++i) {
641 info->fColorOffsets[i] = SkFixedToScalar(fRecs[i].fPos);
646 info->fColorCount = fColorCount;
647 info->fTileMode = fTileMode;
648 info->fGradientFlags = fGradFlags;
652 #ifndef SK_IGNORE_TO_STRING
653 void SkGradientShaderBase::toString(SkString* str) const {
655 str->appendf("%d colors: ", fColorCount);
657 for (int i = 0; i < fColorCount; ++i) {
658 str->appendHex(fOrigColors[i]);
659 if (i < fColorCount-1) {
664 if (fColorCount > 2) {
665 str->append(" points: (");
666 for (int i = 0; i < fColorCount; ++i) {
667 str->appendScalar(SkFixedToScalar(fRecs[i].fPos));
668 if (i < fColorCount-1) {
675 static const char* gTileModeName[SkShader::kTileModeCount] = {
676 "clamp", "repeat", "mirror"
680 str->append(gTileModeName[fTileMode]);
682 // TODO: add "fMapper->toString(str);" when SkUnitMapper::toString is added
684 this->INHERITED::toString(str);
688 ///////////////////////////////////////////////////////////////////////////////
689 ///////////////////////////////////////////////////////////////////////////////
691 #include "SkEmptyShader.h"
693 // assumes colors is SkColor* and pos is SkScalar*
694 #define EXPAND_1_COLOR(count) \
698 tmp[0] = tmp[1] = colors[0]; \
705 static void desc_init(SkGradientShaderBase::Descriptor* desc,
706 const SkColor colors[],
707 const SkScalar pos[], int colorCount,
708 SkShader::TileMode mode,
709 SkUnitMapper* mapper, uint32_t flags) {
710 desc->fColors = colors;
712 desc->fCount = colorCount;
713 desc->fTileMode = mode;
714 desc->fMapper = mapper;
715 desc->fFlags = flags;
718 SkShader* SkGradientShader::CreateLinear(const SkPoint pts[2],
719 const SkColor colors[],
720 const SkScalar pos[], int colorCount,
721 SkShader::TileMode mode,
722 SkUnitMapper* mapper,
724 if (NULL == pts || NULL == colors || colorCount < 1) {
727 EXPAND_1_COLOR(colorCount);
729 SkGradientShaderBase::Descriptor desc;
730 desc_init(&desc, colors, pos, colorCount, mode, mapper, flags);
731 return SkNEW_ARGS(SkLinearGradient, (pts, desc));
734 SkShader* SkGradientShader::CreateRadial(const SkPoint& center, SkScalar radius,
735 const SkColor colors[],
736 const SkScalar pos[], int colorCount,
737 SkShader::TileMode mode,
738 SkUnitMapper* mapper,
740 if (radius <= 0 || NULL == colors || colorCount < 1) {
743 EXPAND_1_COLOR(colorCount);
745 SkGradientShaderBase::Descriptor desc;
746 desc_init(&desc, colors, pos, colorCount, mode, mapper, flags);
747 return SkNEW_ARGS(SkRadialGradient, (center, radius, desc));
750 SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start,
751 SkScalar startRadius,
754 const SkColor colors[],
755 const SkScalar pos[],
757 SkShader::TileMode mode,
758 SkUnitMapper* mapper,
760 if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) {
763 EXPAND_1_COLOR(colorCount);
765 SkGradientShaderBase::Descriptor desc;
766 desc_init(&desc, colors, pos, colorCount, mode, mapper, flags);
767 return SkNEW_ARGS(SkTwoPointRadialGradient,
768 (start, startRadius, end, endRadius, desc));
771 SkShader* SkGradientShader::CreateTwoPointConical(const SkPoint& start,
772 SkScalar startRadius,
775 const SkColor colors[],
776 const SkScalar pos[],
778 SkShader::TileMode mode,
779 SkUnitMapper* mapper,
781 if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) {
784 if (start == end && startRadius == endRadius) {
785 return SkNEW(SkEmptyShader);
787 EXPAND_1_COLOR(colorCount);
789 SkGradientShaderBase::Descriptor desc;
790 desc_init(&desc, colors, pos, colorCount, mode, mapper, flags);
791 return SkNEW_ARGS(SkTwoPointConicalGradient,
792 (start, startRadius, end, endRadius, desc));
795 SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy,
796 const SkColor colors[],
797 const SkScalar pos[],
798 int colorCount, SkUnitMapper* mapper,
800 if (NULL == colors || colorCount < 1) {
803 EXPAND_1_COLOR(colorCount);
805 SkGradientShaderBase::Descriptor desc;
806 desc_init(&desc, colors, pos, colorCount, SkShader::kClamp_TileMode, mapper, flags);
807 return SkNEW_ARGS(SkSweepGradient, (cx, cy, desc));
810 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkGradientShader)
811 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLinearGradient)
812 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkRadialGradient)
813 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSweepGradient)
814 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTwoPointRadialGradient)
815 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTwoPointConicalGradient)
816 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
818 ///////////////////////////////////////////////////////////////////////////////
822 #include "effects/GrTextureStripAtlas.h"
823 #include "GrTBackendEffectFactory.h"
826 GrGLGradientEffect::GrGLGradientEffect(const GrBackendEffectFactory& factory)
828 , fCachedYCoord(SK_ScalarMax) {
831 GrGLGradientEffect::~GrGLGradientEffect() { }
833 void GrGLGradientEffect::emitUniforms(GrGLShaderBuilder* builder, EffectKey key) {
835 if (GrGradientEffect::kTwo_ColorType == ColorTypeFromKey(key)) { // 2 Color case
836 fColorStartUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
837 kVec4f_GrSLType, "GradientStartColor");
838 fColorEndUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
839 kVec4f_GrSLType, "GradientEndColor");
841 } else if (GrGradientEffect::kThree_ColorType == ColorTypeFromKey(key)){ // 3 Color Case
842 fColorStartUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
843 kVec4f_GrSLType, "GradientStartColor");
844 fColorMidUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
845 kVec4f_GrSLType, "GradientMidColor");
846 fColorEndUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
847 kVec4f_GrSLType, "GradientEndColor");
849 } else { // if not a fast case
850 fFSYUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
851 kFloat_GrSLType, "GradientYCoordFS");
855 static inline void set_color_uni(const GrGLUniformManager& uman,
856 const GrGLUniformManager::UniformHandle uni,
857 const SkColor* color) {
859 SkColorGetR(*color) / 255.f,
860 SkColorGetG(*color) / 255.f,
861 SkColorGetB(*color) / 255.f,
862 SkColorGetA(*color) / 255.f);
865 static inline void set_mul_color_uni(const GrGLUniformManager& uman,
866 const GrGLUniformManager::UniformHandle uni,
867 const SkColor* color){
868 float a = SkColorGetA(*color) / 255.f;
869 float aDiv255 = a / 255.f;
871 SkColorGetR(*color) * aDiv255,
872 SkColorGetG(*color) * aDiv255,
873 SkColorGetB(*color) * aDiv255,
877 void GrGLGradientEffect::setData(const GrGLUniformManager& uman,
878 const GrDrawEffect& drawEffect) {
880 const GrGradientEffect& e = drawEffect.castEffect<GrGradientEffect>();
883 if (GrGradientEffect::kTwo_ColorType == e.getColorType()){
885 if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
886 set_mul_color_uni(uman, fColorStartUni, e.getColors(0));
887 set_mul_color_uni(uman, fColorEndUni, e.getColors(1));
889 set_color_uni(uman, fColorStartUni, e.getColors(0));
890 set_color_uni(uman, fColorEndUni, e.getColors(1));
893 } else if (GrGradientEffect::kThree_ColorType == e.getColorType()){
895 if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
896 set_mul_color_uni(uman, fColorStartUni, e.getColors(0));
897 set_mul_color_uni(uman, fColorMidUni, e.getColors(1));
898 set_mul_color_uni(uman, fColorEndUni, e.getColors(2));
900 set_color_uni(uman, fColorStartUni, e.getColors(0));
901 set_color_uni(uman, fColorMidUni, e.getColors(1));
902 set_color_uni(uman, fColorEndUni, e.getColors(2));
906 SkScalar yCoord = e.getYCoord();
907 if (yCoord != fCachedYCoord) {
908 uman.set1f(fFSYUni, yCoord);
909 fCachedYCoord = yCoord;
915 GrGLEffect::EffectKey GrGLGradientEffect::GenBaseGradientKey(const GrDrawEffect& drawEffect) {
916 const GrGradientEffect& e = drawEffect.castEffect<GrGradientEffect>();
920 if (GrGradientEffect::kTwo_ColorType == e.getColorType()) {
922 } else if (GrGradientEffect::kThree_ColorType == e.getColorType()){
923 key |= kThreeColorKey;
926 if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
927 key |= kPremulBeforeInterpKey;
933 void GrGLGradientEffect::emitColor(GrGLShaderBuilder* builder,
934 const char* gradientTValue,
936 const char* outputColor,
937 const char* inputColor,
938 const TextureSamplerArray& samplers) {
939 if (GrGradientEffect::kTwo_ColorType == ColorTypeFromKey(key)){
940 builder->fsCodeAppendf("\tvec4 colorTemp = mix(%s, %s, clamp(%s, 0.0, 1.0));\n",
941 builder->getUniformVariable(fColorStartUni).c_str(),
942 builder->getUniformVariable(fColorEndUni).c_str(),
944 // Note that we could skip this step if both colors are known to be opaque. Two
946 // The gradient SkShader reporting opaque is more restrictive than necessary in the two pt
947 // case. Make sure the key reflects this optimization (and note that it can use the same
948 // shader as thekBeforeIterp case). This same optimization applies to the 3 color case below.
949 if (GrGradientEffect::kAfterInterp_PremulType == PremulTypeFromKey(key)) {
950 builder->fsCodeAppend("\tcolorTemp.rgb *= colorTemp.a;\n");
953 builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
954 (GrGLSLExpr4(inputColor) * GrGLSLExpr4("colorTemp")).c_str());
955 } else if (GrGradientEffect::kThree_ColorType == ColorTypeFromKey(key)){
956 builder->fsCodeAppendf("\tfloat oneMinus2t = 1.0 - (2.0 * (%s));\n",
958 builder->fsCodeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s;\n",
959 builder->getUniformVariable(fColorStartUni).c_str());
960 if (kTegra3_GrGLRenderer == builder->ctxInfo().renderer()) {
961 // The Tegra3 compiler will sometimes never return if we have
962 // min(abs(oneMinus2t), 1.0), or do the abs first in a separate expression.
963 builder->fsCodeAppend("\tfloat minAbs = abs(oneMinus2t);\n");
964 builder->fsCodeAppend("\tminAbs = minAbs > 1.0 ? 1.0 : minAbs;\n");
965 builder->fsCodeAppendf("\tcolorTemp += (1.0 - minAbs) * %s;\n",
966 builder->getUniformVariable(fColorMidUni).c_str());
968 builder->fsCodeAppendf("\tcolorTemp += (1.0 - min(abs(oneMinus2t), 1.0)) * %s;\n",
969 builder->getUniformVariable(fColorMidUni).c_str());
971 builder->fsCodeAppendf("\tcolorTemp += clamp(-oneMinus2t, 0.0, 1.0) * %s;\n",
972 builder->getUniformVariable(fColorEndUni).c_str());
973 if (GrGradientEffect::kAfterInterp_PremulType == PremulTypeFromKey(key)) {
974 builder->fsCodeAppend("\tcolorTemp.rgb *= colorTemp.a;\n");
977 builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
978 (GrGLSLExpr4(inputColor) * GrGLSLExpr4("colorTemp")).c_str());
980 builder->fsCodeAppendf("\tvec2 coord = vec2(%s, %s);\n",
982 builder->getUniformVariable(fFSYUni).c_str());
983 builder->fsCodeAppendf("\t%s = ", outputColor);
984 builder->fsAppendTextureLookupAndModulate(inputColor,
987 builder->fsCodeAppend(";\n");
991 /////////////////////////////////////////////////////////////////////
993 GrGradientEffect::GrGradientEffect(GrContext* ctx,
994 const SkGradientShaderBase& shader,
995 const SkMatrix& matrix,
996 SkShader::TileMode tileMode) {
998 fIsOpaque = shader.isOpaque();
1000 SkShader::GradientInfo info;
1001 SkScalar pos[3] = {0};
1003 info.fColorCount = 3;
1004 info.fColors = &fColors[0];
1005 info.fColorOffsets = &pos[0];
1006 shader.asAGradient(&info);
1008 // The two and three color specializations do not currently support tiling.
1009 bool foundSpecialCase = false;
1010 if (SkShader::kClamp_TileMode == info.fTileMode) {
1011 if (2 == info.fColorCount) {
1012 fRow = -1; // flag for no atlas
1013 fColorType = kTwo_ColorType;
1014 foundSpecialCase = true;
1015 } else if (3 == info.fColorCount &&
1016 (SkScalarAbs(pos[1] - SK_ScalarHalf) < SK_Scalar1 / 1000)) { // 3 color symmetric
1017 fRow = -1; // flag for no atlas
1018 fColorType = kThree_ColorType;
1019 foundSpecialCase = true;
1022 if (foundSpecialCase) {
1023 if (SkGradientShader::kInterpolateColorsInPremul_Flag & info.fGradientFlags) {
1024 fPremulType = kBeforeInterp_PremulType;
1026 fPremulType = kAfterInterp_PremulType;
1028 fCoordTransform.reset(kCoordSet, matrix);
1030 // doesn't matter how this is set, just be consistent because it is part of the effect key.
1031 fPremulType = kBeforeInterp_PremulType;
1033 shader.getGradientTableBitmap(&bitmap);
1034 fColorType = kTexture_ColorType;
1036 GrTextureStripAtlas::Desc desc;
1037 desc.fWidth = bitmap.width();
1039 desc.fRowHeight = bitmap.height();
1040 desc.fContext = ctx;
1041 desc.fConfig = SkImageInfo2GrPixelConfig(bitmap.colorType(), bitmap.alphaType());
1042 fAtlas = GrTextureStripAtlas::GetAtlas(desc);
1043 SkASSERT(NULL != fAtlas);
1045 // We always filter the gradient table. Each table is one row of a texture, always y-clamp.
1046 GrTextureParams params;
1047 params.setFilterMode(GrTextureParams::kBilerp_FilterMode);
1048 params.setTileModeX(tileMode);
1050 fRow = fAtlas->lockRow(bitmap);
1052 fYCoord = fAtlas->getYOffset(fRow) + SK_ScalarHalf *
1053 fAtlas->getVerticalScaleFactor();
1054 fCoordTransform.reset(kCoordSet, matrix, fAtlas->getTexture());
1055 fTextureAccess.reset(fAtlas->getTexture(), params);
1057 GrTexture* texture = GrLockAndRefCachedBitmapTexture(ctx, bitmap, ¶ms);
1058 fCoordTransform.reset(kCoordSet, matrix, texture);
1059 fTextureAccess.reset(texture, params);
1060 fYCoord = SK_ScalarHalf;
1062 // Unlock immediately, this is not great, but we don't have a way of
1063 // knowing when else to unlock it currently, so it may get purged from
1064 // the cache, but it'll still be ref'd until it's no longer being used.
1065 GrUnlockAndUnrefCachedBitmapTexture(texture);
1067 this->addTextureAccess(&fTextureAccess);
1069 this->addCoordTransform(&fCoordTransform);
1072 GrGradientEffect::~GrGradientEffect() {
1073 if (this->useAtlas()) {
1074 fAtlas->unlockRow(fRow);
1078 bool GrGradientEffect::onIsEqual(const GrEffect& effect) const {
1079 const GrGradientEffect& s = CastEffect<GrGradientEffect>(effect);
1081 if (this->fColorType == s.getColorType()){
1083 if (kTwo_ColorType == fColorType) {
1084 if (*this->getColors(0) != *s.getColors(0) ||
1085 *this->getColors(1) != *s.getColors(1)) {
1088 } else if (kThree_ColorType == fColorType) {
1089 if (*this->getColors(0) != *s.getColors(0) ||
1090 *this->getColors(1) != *s.getColors(1) ||
1091 *this->getColors(2) != *s.getColors(2)) {
1095 if (fYCoord != s.getYCoord()) {
1100 return fTextureAccess.getTexture() == s.fTextureAccess.getTexture() &&
1101 fTextureAccess.getParams().getTileModeX() ==
1102 s.fTextureAccess.getParams().getTileModeX() &&
1103 this->useAtlas() == s.useAtlas() &&
1104 fCoordTransform.getMatrix().cheapEqualTo(s.fCoordTransform.getMatrix());
1110 void GrGradientEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
1111 if (fIsOpaque && (kA_GrColorComponentFlag & *validFlags) && 0xff == GrColorUnpackA(*color)) {
1112 *validFlags = kA_GrColorComponentFlag;
1118 int GrGradientEffect::RandomGradientParams(SkRandom* random,
1121 SkShader::TileMode* tm) {
1122 int outColors = random->nextRangeU(1, kMaxRandomGradientColors);
1124 // if one color, omit stops, otherwise randomly decide whether or not to
1125 if (outColors == 1 || (outColors >= 2 && random->nextBool())) {
1129 SkScalar stop = 0.f;
1130 for (int i = 0; i < outColors; ++i) {
1131 colors[i] = random->nextU();
1132 if (NULL != *stops) {
1134 stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
1137 *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));