| |
| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkGradientShaderPriv.h" |
| #include "SkLinearGradient.h" |
| #include "SkRadialGradient.h" |
| #include "SkTwoPointRadialGradient.h" |
| #include "SkTwoPointConicalGradient.h" |
| #include "SkSweepGradient.h" |
| |
| SkGradientShaderBase::SkGradientShaderBase(const SkColor colors[], const SkScalar pos[], |
| int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper) { |
| SkASSERT(colorCount > 1); |
| |
| fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return |
| |
| fMapper = mapper; |
| SkSafeRef(mapper); |
| |
| SkASSERT((unsigned)mode < SkShader::kTileModeCount); |
| SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs)); |
| fTileMode = mode; |
| fTileProc = gTileProcs[mode]; |
| |
| fCache16 = fCache16Storage = NULL; |
| fCache32 = NULL; |
| fCache32PixelRef = NULL; |
| |
| /* Note: we let the caller skip the first and/or last position. |
| i.e. pos[0] = 0.3, pos[1] = 0.7 |
| In these cases, we insert dummy entries to ensure that the final data |
| will be bracketed by [0, 1]. |
| i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1 |
| |
| Thus colorCount (the caller's value, and fColorCount (our value) may |
| differ by up to 2. In the above example: |
| colorCount = 2 |
| fColorCount = 4 |
| */ |
| fColorCount = colorCount; |
| // check if we need to add in dummy start and/or end position/colors |
| bool dummyFirst = false; |
| bool dummyLast = false; |
| if (pos) { |
| dummyFirst = pos[0] != 0; |
| dummyLast = pos[colorCount - 1] != SK_Scalar1; |
| fColorCount += dummyFirst + dummyLast; |
| } |
| |
| if (fColorCount > kColorStorageCount) { |
| size_t size = sizeof(SkColor) + sizeof(Rec); |
| fOrigColors = reinterpret_cast<SkColor*>( |
| sk_malloc_throw(size * fColorCount)); |
| } |
| else { |
| fOrigColors = fStorage; |
| } |
| |
| // Now copy over the colors, adding the dummies as needed |
| { |
| SkColor* origColors = fOrigColors; |
| if (dummyFirst) { |
| *origColors++ = colors[0]; |
| } |
| memcpy(origColors, colors, colorCount * sizeof(SkColor)); |
| if (dummyLast) { |
| origColors += colorCount; |
| *origColors = colors[colorCount - 1]; |
| } |
| } |
| |
| fRecs = (Rec*)(fOrigColors + fColorCount); |
| if (fColorCount > 2) { |
| Rec* recs = fRecs; |
| recs->fPos = 0; |
| // recs->fScale = 0; // unused; |
| recs += 1; |
| if (pos) { |
| /* We need to convert the user's array of relative positions into |
| fixed-point positions and scale factors. We need these results |
| to be strictly monotonic (no two values equal or out of order). |
| Hence this complex loop that just jams a zero for the scale |
| value if it sees a segment out of order, and it assures that |
| we start at 0 and end at 1.0 |
| */ |
| SkFixed prev = 0; |
| int startIndex = dummyFirst ? 0 : 1; |
| int count = colorCount + dummyLast; |
| for (int i = startIndex; i < count; i++) { |
| // force the last value to be 1.0 |
| SkFixed curr; |
| if (i == colorCount) { // we're really at the dummyLast |
| curr = SK_Fixed1; |
| } else { |
| curr = SkScalarToFixed(pos[i]); |
| } |
| // pin curr withing range |
| if (curr < 0) { |
| curr = 0; |
| } else if (curr > SK_Fixed1) { |
| curr = SK_Fixed1; |
| } |
| recs->fPos = curr; |
| if (curr > prev) { |
| recs->fScale = (1 << 24) / (curr - prev); |
| } else { |
| recs->fScale = 0; // ignore this segment |
| } |
| // get ready for the next value |
| prev = curr; |
| recs += 1; |
| } |
| } else { // assume even distribution |
| SkFixed dp = SK_Fixed1 / (colorCount - 1); |
| SkFixed p = dp; |
| SkFixed scale = (colorCount - 1) << 8; // (1 << 24) / dp |
| for (int i = 1; i < colorCount; i++) { |
| recs->fPos = p; |
| recs->fScale = scale; |
| recs += 1; |
| p += dp; |
| } |
| } |
| } |
| this->initCommon(); |
| } |
| |
| SkGradientShaderBase::SkGradientShaderBase(SkFlattenableReadBuffer& buffer) : |
| INHERITED(buffer) { |
| fCacheAlpha = 256; |
| |
| fMapper = buffer.readFlattenableT<SkUnitMapper>(); |
| |
| fCache16 = fCache16Storage = NULL; |
| fCache32 = NULL; |
| fCache32PixelRef = NULL; |
| |
| int colorCount = fColorCount = buffer.getArrayCount(); |
| if (colorCount > kColorStorageCount) { |
| size_t size = sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec); |
| fOrigColors = (SkColor*)sk_malloc_throw(size * colorCount); |
| } else { |
| fOrigColors = fStorage; |
| } |
| buffer.readColorArray(fOrigColors); |
| |
| fTileMode = (TileMode)buffer.readUInt(); |
| fTileProc = gTileProcs[fTileMode]; |
| fRecs = (Rec*)(fOrigColors + colorCount); |
| if (colorCount > 2) { |
| Rec* recs = fRecs; |
| recs[0].fPos = 0; |
| for (int i = 1; i < colorCount; i++) { |
| recs[i].fPos = buffer.readInt(); |
| recs[i].fScale = buffer.readUInt(); |
| } |
| } |
| buffer.readMatrix(&fPtsToUnit); |
| this->initCommon(); |
| } |
| |
| SkGradientShaderBase::~SkGradientShaderBase() { |
| if (fCache16Storage) { |
| sk_free(fCache16Storage); |
| } |
| SkSafeUnref(fCache32PixelRef); |
| if (fOrigColors != fStorage) { |
| sk_free(fOrigColors); |
| } |
| SkSafeUnref(fMapper); |
| } |
| |
| void SkGradientShaderBase::initCommon() { |
| fFlags = 0; |
| unsigned colorAlpha = 0xFF; |
| for (int i = 0; i < fColorCount; i++) { |
| colorAlpha &= SkColorGetA(fOrigColors[i]); |
| } |
| fColorsAreOpaque = colorAlpha == 0xFF; |
| } |
| |
| void SkGradientShaderBase::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeFlattenable(fMapper); |
| buffer.writeColorArray(fOrigColors, fColorCount); |
| buffer.writeUInt(fTileMode); |
| if (fColorCount > 2) { |
| Rec* recs = fRecs; |
| for (int i = 1; i < fColorCount; i++) { |
| buffer.writeInt(recs[i].fPos); |
| buffer.writeUInt(recs[i].fScale); |
| } |
| } |
| buffer.writeMatrix(fPtsToUnit); |
| } |
| |
| bool SkGradientShaderBase::isOpaque() const { |
| return fColorsAreOpaque; |
| } |
| |
| bool SkGradientShaderBase::setContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix) { |
| if (!this->INHERITED::setContext(device, paint, matrix)) { |
| return false; |
| } |
| |
| const SkMatrix& inverse = this->getTotalInverse(); |
| |
| if (!fDstToIndex.setConcat(fPtsToUnit, inverse)) { |
| // need to keep our set/end context calls balanced. |
| this->INHERITED::endContext(); |
| return false; |
| } |
| |
| fDstToIndexProc = fDstToIndex.getMapXYProc(); |
| fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex); |
| |
| // now convert our colors in to PMColors |
| unsigned paintAlpha = this->getPaintAlpha(); |
| |
| fFlags = this->INHERITED::getFlags(); |
| if (fColorsAreOpaque && paintAlpha == 0xFF) { |
| fFlags |= kOpaqueAlpha_Flag; |
| } |
| // we can do span16 as long as our individual colors are opaque, |
| // regardless of the paint's alpha |
| if (fColorsAreOpaque) { |
| fFlags |= kHasSpan16_Flag; |
| } |
| |
| this->setCacheAlpha(paintAlpha); |
| return true; |
| } |
| |
| void SkGradientShaderBase::setCacheAlpha(U8CPU alpha) const { |
| // if the new alpha differs from the previous time we were called, inval our cache |
| // this will trigger the cache to be rebuilt. |
| // we don't care about the first time, since the cache ptrs will already be NULL |
| if (fCacheAlpha != alpha) { |
| fCache16 = NULL; // inval the cache |
| fCache32 = NULL; // inval the cache |
| fCacheAlpha = alpha; // record the new alpha |
| // inform our subclasses |
| if (fCache32PixelRef) { |
| fCache32PixelRef->notifyPixelsChanged(); |
| } |
| } |
| } |
| |
| #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8) |
| |
| /** We take the original colors, not our premultiplied PMColors, since we can |
| build a 16bit table as long as the original colors are opaque, even if the |
| paint specifies a non-opaque alpha. |
| */ |
| void SkGradientShaderBase::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1, |
| int count) { |
| SkASSERT(count > 1); |
| SkASSERT(SkColorGetA(c0) == 0xFF); |
| SkASSERT(SkColorGetA(c1) == 0xFF); |
| |
| SkFixed r = SkColorGetR(c0); |
| SkFixed g = SkColorGetG(c0); |
| SkFixed b = SkColorGetB(c0); |
| |
| SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| |
| r = SkIntToFixed(r) + 0x8000; |
| g = SkIntToFixed(g) + 0x8000; |
| b = SkIntToFixed(b) + 0x8000; |
| |
| do { |
| unsigned rr = r >> 16; |
| unsigned gg = g >> 16; |
| unsigned bb = b >> 16; |
| cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb)); |
| cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb); |
| cache += 1; |
| r += dr; |
| g += dg; |
| b += db; |
| } while (--count != 0); |
| } |
| |
| /* |
| * 2x2 dither a fixed-point color component (8.16) down to 8, matching the |
| * semantics of how we 2x2 dither 32->16 |
| */ |
| static inline U8CPU dither_fixed_to_8(SkFixed n) { |
| n >>= 8; |
| return ((n << 1) - ((n >> 8 << 8) | (n >> 8))) >> 8; |
| } |
| |
| /* |
| * For dithering with premultiply, we want to ceiling the alpha component, |
| * to ensure that it is always >= any color component. |
| */ |
| static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) { |
| n >>= 8; |
| return ((n << 1) - (n | (n >> 8))) >> 8; |
| } |
| |
| void SkGradientShaderBase::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1, |
| int count, U8CPU paintAlpha) { |
| SkASSERT(count > 1); |
| |
| // need to apply paintAlpha to our two endpoints |
| SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha); |
| SkFixed da; |
| { |
| int tmp = SkMulDiv255Round(SkColorGetA(c1), paintAlpha); |
| da = SkIntToFixed(tmp - a) / (count - 1); |
| } |
| |
| SkFixed r = SkColorGetR(c0); |
| SkFixed g = SkColorGetG(c0); |
| SkFixed b = SkColorGetB(c0); |
| SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| |
| a = SkIntToFixed(a) + 0x8000; |
| r = SkIntToFixed(r) + 0x8000; |
| g = SkIntToFixed(g) + 0x8000; |
| b = SkIntToFixed(b) + 0x8000; |
| |
| do { |
| cache[0] = SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16); |
| cache[kCache32Count] = |
| SkPremultiplyARGBInline(dither_ceil_fixed_to_8(a), |
| dither_fixed_to_8(r), |
| dither_fixed_to_8(g), |
| dither_fixed_to_8(b)); |
| cache += 1; |
| a += da; |
| r += dr; |
| g += dg; |
| b += db; |
| } while (--count != 0); |
| } |
| |
| static inline int SkFixedToFFFF(SkFixed x) { |
| SkASSERT((unsigned)x <= SK_Fixed1); |
| return x - (x >> 16); |
| } |
| |
| static inline U16CPU bitsTo16(unsigned x, const unsigned bits) { |
| SkASSERT(x < (1U << bits)); |
| if (6 == bits) { |
| return (x << 10) | (x << 4) | (x >> 2); |
| } |
| if (8 == bits) { |
| return (x << 8) | x; |
| } |
| sk_throw(); |
| return 0; |
| } |
| |
| const uint16_t* SkGradientShaderBase::getCache16() const { |
| if (fCache16 == NULL) { |
| // double the count for dither entries |
| const int entryCount = kCache16Count * 2; |
| const size_t allocSize = sizeof(uint16_t) * entryCount; |
| |
| if (fCache16Storage == NULL) { // set the storage and our working ptr |
| fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
| } |
| fCache16 = fCache16Storage; |
| if (fColorCount == 2) { |
| Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1], |
| kCache16Count); |
| } else { |
| Rec* rec = fRecs; |
| int prevIndex = 0; |
| for (int i = 1; i < fColorCount; i++) { |
| int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift; |
| SkASSERT(nextIndex < kCache16Count); |
| |
| if (nextIndex > prevIndex) |
| Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1); |
| prevIndex = nextIndex; |
| } |
| } |
| |
| if (fMapper) { |
| fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
| uint16_t* linear = fCache16; // just computed linear data |
| uint16_t* mapped = fCache16Storage; // storage for mapped data |
| SkUnitMapper* map = fMapper; |
| for (int i = 0; i < kCache16Count; i++) { |
| int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift; |
| mapped[i] = linear[index]; |
| mapped[i + kCache16Count] = linear[index + kCache16Count]; |
| } |
| sk_free(fCache16); |
| fCache16 = fCache16Storage; |
| } |
| } |
| return fCache16; |
| } |
| |
| const SkPMColor* SkGradientShaderBase::getCache32() const { |
| if (fCache32 == NULL) { |
| // double the count for dither entries |
| const int entryCount = kCache32Count * 2; |
| const size_t allocSize = sizeof(SkPMColor) * entryCount; |
| |
| if (NULL == fCache32PixelRef) { |
| fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef, |
| (NULL, allocSize, NULL)); |
| } |
| fCache32 = (SkPMColor*)fCache32PixelRef->getAddr(); |
| if (fColorCount == 2) { |
| Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1], |
| kCache32Count, fCacheAlpha); |
| } else { |
| Rec* rec = fRecs; |
| int prevIndex = 0; |
| for (int i = 1; i < fColorCount; i++) { |
| int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache32Shift; |
| SkASSERT(nextIndex < kCache32Count); |
| |
| if (nextIndex > prevIndex) |
| Build32bitCache(fCache32 + prevIndex, fOrigColors[i-1], |
| fOrigColors[i], |
| nextIndex - prevIndex + 1, fCacheAlpha); |
| prevIndex = nextIndex; |
| } |
| } |
| |
| if (fMapper) { |
| SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef, |
| (NULL, allocSize, NULL)); |
| SkPMColor* linear = fCache32; // just computed linear data |
| SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data |
| SkUnitMapper* map = fMapper; |
| for (int i = 0; i < kCache32Count; i++) { |
| int index = map->mapUnit16((i << 8) | i) >> 8; |
| mapped[i] = linear[index]; |
| mapped[i + kCache32Count] = linear[index + kCache32Count]; |
| } |
| fCache32PixelRef->unref(); |
| fCache32PixelRef = newPR; |
| fCache32 = (SkPMColor*)newPR->getAddr(); |
| } |
| } |
| return fCache32; |
| } |
| |
| /* |
| * Because our caller might rebuild the same (logically the same) gradient |
| * over and over, we'd like to return exactly the same "bitmap" if possible, |
| * allowing the client to utilize a cache of our bitmap (e.g. with a GPU). |
| * To do that, we maintain a private cache of built-bitmaps, based on our |
| * colors and positions. Note: we don't try to flatten the fMapper, so if one |
| * is present, we skip the cache for now. |
| */ |
| void SkGradientShaderBase::getGradientTableBitmap(SkBitmap* bitmap) const { |
| // our caller assumes no external alpha, so we ensure that our cache is |
| // built with 0xFF |
| this->setCacheAlpha(0xFF); |
| |
| // don't have a way to put the mapper into our cache-key yet |
| if (fMapper) { |
| // force our cahce32pixelref to be built |
| (void)this->getCache32(); |
| bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| bitmap->setPixelRef(fCache32PixelRef); |
| return; |
| } |
| |
| // build our key: [numColors + colors[] + {positions[]} ] |
| int count = 1 + fColorCount; |
| if (fColorCount > 2) { |
| count += fColorCount - 1; // fRecs[].fPos |
| } |
| |
| SkAutoSTMalloc<16, int32_t> storage(count); |
| int32_t* buffer = storage.get(); |
| |
| *buffer++ = fColorCount; |
| memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor)); |
| buffer += fColorCount; |
| if (fColorCount > 2) { |
| for (int i = 1; i < fColorCount; i++) { |
| *buffer++ = fRecs[i].fPos; |
| } |
| } |
| SkASSERT(buffer - storage.get() == count); |
| |
| /////////////////////////////////// |
| |
| SK_DECLARE_STATIC_MUTEX(gMutex); |
| static SkBitmapCache* gCache; |
| // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp |
| static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32; |
| SkAutoMutexAcquire ama(gMutex); |
| |
| if (NULL == gCache) { |
| gCache = SkNEW_ARGS(SkBitmapCache, (MAX_NUM_CACHED_GRADIENT_BITMAPS)); |
| } |
| size_t size = count * sizeof(int32_t); |
| |
| if (!gCache->find(storage.get(), size, bitmap)) { |
| // force our cahce32pixelref to be built |
| (void)this->getCache32(); |
| bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| bitmap->setPixelRef(fCache32PixelRef); |
| |
| gCache->add(storage.get(), size, *bitmap); |
| } |
| } |
| |
| void SkGradientShaderBase::commonAsAGradient(GradientInfo* info) const { |
| if (info) { |
| if (info->fColorCount >= fColorCount) { |
| if (info->fColors) { |
| memcpy(info->fColors, fOrigColors, fColorCount * sizeof(SkColor)); |
| } |
| if (info->fColorOffsets) { |
| if (fColorCount == 2) { |
| info->fColorOffsets[0] = 0; |
| info->fColorOffsets[1] = SK_Scalar1; |
| } else if (fColorCount > 2) { |
| for (int i = 0; i < fColorCount; ++i) { |
| info->fColorOffsets[i] = SkFixedToScalar(fRecs[i].fPos); |
| } |
| } |
| } |
| } |
| info->fColorCount = fColorCount; |
| info->fTileMode = fTileMode; |
| } |
| } |
| |
| #ifdef SK_DEVELOPER |
| void SkGradientShaderBase::toString(SkString* str) const { |
| |
| str->appendf("%d colors: ", fColorCount); |
| |
| for (int i = 0; i < fColorCount; ++i) { |
| str->appendHex(fOrigColors[i]); |
| if (i < fColorCount-1) { |
| str->append(", "); |
| } |
| } |
| |
| if (fColorCount > 2) { |
| str->append(" points: ("); |
| for (int i = 0; i < fColorCount; ++i) { |
| str->appendScalar(SkFixedToScalar(fRecs[i].fPos)); |
| if (i < fColorCount-1) { |
| str->append(", "); |
| } |
| } |
| str->append(")"); |
| } |
| |
| static const char* gTileModeName[SkShader::kTileModeCount] = { |
| "clamp", "repeat", "mirror" |
| }; |
| |
| str->append(" "); |
| str->append(gTileModeName[fTileMode]); |
| |
| // TODO: add "fMapper->toString(str);" when SkUnitMapper::toString is added |
| |
| this->INHERITED::toString(str); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkEmptyShader.h" |
| |
| // assumes colors is SkColor* and pos is SkScalar* |
| #define EXPAND_1_COLOR(count) \ |
| SkColor tmp[2]; \ |
| do { \ |
| if (1 == count) { \ |
| tmp[0] = tmp[1] = colors[0]; \ |
| colors = tmp; \ |
| pos = NULL; \ |
| count = 2; \ |
| } \ |
| } while (0) |
| |
| SkShader* SkGradientShader::CreateLinear(const SkPoint pts[2], |
| const SkColor colors[], |
| const SkScalar pos[], int colorCount, |
| SkShader::TileMode mode, |
| SkUnitMapper* mapper) { |
| if (NULL == pts || NULL == colors || colorCount < 1) { |
| return NULL; |
| } |
| EXPAND_1_COLOR(colorCount); |
| |
| return SkNEW_ARGS(SkLinearGradient, |
| (pts, colors, pos, colorCount, mode, mapper)); |
| } |
| |
| SkShader* SkGradientShader::CreateRadial(const SkPoint& center, SkScalar radius, |
| const SkColor colors[], |
| const SkScalar pos[], int colorCount, |
| SkShader::TileMode mode, |
| SkUnitMapper* mapper) { |
| if (radius <= 0 || NULL == colors || colorCount < 1) { |
| return NULL; |
| } |
| EXPAND_1_COLOR(colorCount); |
| |
| return SkNEW_ARGS(SkRadialGradient, |
| (center, radius, colors, pos, colorCount, mode, mapper)); |
| } |
| |
| SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start, |
| SkScalar startRadius, |
| const SkPoint& end, |
| SkScalar endRadius, |
| const SkColor colors[], |
| const SkScalar pos[], |
| int colorCount, |
| SkShader::TileMode mode, |
| SkUnitMapper* mapper) { |
| if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| return NULL; |
| } |
| EXPAND_1_COLOR(colorCount); |
| |
| return SkNEW_ARGS(SkTwoPointRadialGradient, |
| (start, startRadius, end, endRadius, colors, pos, |
| colorCount, mode, mapper)); |
| } |
| |
| SkShader* SkGradientShader::CreateTwoPointConical(const SkPoint& start, |
| SkScalar startRadius, |
| const SkPoint& end, |
| SkScalar endRadius, |
| const SkColor colors[], |
| const SkScalar pos[], |
| int colorCount, |
| SkShader::TileMode mode, |
| SkUnitMapper* mapper) { |
| if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| return NULL; |
| } |
| if (start == end && startRadius == endRadius) { |
| return SkNEW(SkEmptyShader); |
| } |
| EXPAND_1_COLOR(colorCount); |
| |
| return SkNEW_ARGS(SkTwoPointConicalGradient, |
| (start, startRadius, end, endRadius, colors, pos, |
| colorCount, mode, mapper)); |
| } |
| |
| SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, |
| const SkColor colors[], |
| const SkScalar pos[], |
| int count, SkUnitMapper* mapper) { |
| if (NULL == colors || count < 1) { |
| return NULL; |
| } |
| EXPAND_1_COLOR(count); |
| |
| return SkNEW_ARGS(SkSweepGradient, (cx, cy, colors, pos, count, mapper)); |
| } |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkGradientShader) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLinearGradient) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkRadialGradient) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSweepGradient) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTwoPointRadialGradient) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkTwoPointConicalGradient) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "effects/GrTextureStripAtlas.h" |
| #include "SkGr.h" |
| |
| GrGLGradientEffect::GrGLGradientEffect(const GrBackendEffectFactory& factory) |
| : INHERITED(factory) |
| , fCachedYCoord(SK_ScalarMax) |
| , fFSYUni(GrGLUniformManager::kInvalidUniformHandle) { |
| } |
| |
| GrGLGradientEffect::~GrGLGradientEffect() { } |
| |
| void GrGLGradientEffect::emitYCoordUniform(GrGLShaderBuilder* builder) { |
| fFSYUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, |
| kFloat_GrSLType, "GradientYCoordFS"); |
| } |
| |
| void GrGLGradientEffect::setData(const GrGLUniformManager& uman, const GrEffectStage& stage) { |
| const GrGradientEffect& e = GetEffectFromStage<GrGradientEffect>(stage); |
| const GrTexture* texture = e.texture(0); |
| fEffectMatrix.setData(uman, e.getMatrix(), stage.getCoordChangeMatrix(), texture); |
| |
| SkScalar yCoord = e.getYCoord(); |
| if (yCoord != fCachedYCoord) { |
| uman.set1f(fFSYUni, yCoord); |
| fCachedYCoord = yCoord; |
| } |
| } |
| |
| GrGLEffect::EffectKey GrGLGradientEffect::GenMatrixKey(const GrEffectStage& s) { |
| const GrGradientEffect& e = GetEffectFromStage<GrGradientEffect>(s); |
| const GrTexture* texture = e.texture(0); |
| return GrGLEffectMatrix::GenKey(e.getMatrix(), s.getCoordChangeMatrix(), texture); |
| } |
| |
| void GrGLGradientEffect::setupMatrix(GrGLShaderBuilder* builder, |
| EffectKey key, |
| const char* vertexCoords, |
| const char** fsCoordName, |
| const char** vsVaryingName, |
| GrSLType* vsVaryingType) { |
| fEffectMatrix.emitCodeMakeFSCoords2D(builder, |
| key & kMatrixKeyMask, |
| vertexCoords, |
| fsCoordName, |
| vsVaryingName, |
| vsVaryingType); |
| } |
| |
| void GrGLGradientEffect::emitColorLookup(GrGLShaderBuilder* builder, |
| const char* gradientTValue, |
| const char* outputColor, |
| const char* inputColor, |
| const GrGLShaderBuilder::TextureSampler& sampler) { |
| |
| SkString* code = &builder->fFSCode; |
| code->appendf("\tvec2 coord = vec2(%s, %s);\n", |
| gradientTValue, |
| builder->getUniformVariable(fFSYUni).c_str()); |
| code->appendf("\t%s = ", outputColor); |
| builder->appendTextureLookupAndModulate(code, inputColor, sampler, "coord"); |
| code->append(";\n"); |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| GrGradientEffect::GrGradientEffect(GrContext* ctx, |
| const SkGradientShaderBase& shader, |
| const SkMatrix& matrix, |
| SkShader::TileMode tileMode) { |
| // TODO: check for simple cases where we don't need a texture: |
| //GradientInfo info; |
| //shader.asAGradient(&info); |
| //if (info.fColorCount == 2) { ... |
| |
| fMatrix = matrix; |
| |
| SkBitmap bitmap; |
| shader.getGradientTableBitmap(&bitmap); |
| |
| fIsOpaque = shader.isOpaque(); |
| |
| GrTextureStripAtlas::Desc desc; |
| desc.fWidth = bitmap.width(); |
| desc.fHeight = 32; |
| desc.fRowHeight = bitmap.height(); |
| desc.fContext = ctx; |
| desc.fConfig = SkBitmapConfig2GrPixelConfig(bitmap.config()); |
| fAtlas = GrTextureStripAtlas::GetAtlas(desc); |
| GrAssert(NULL != fAtlas); |
| |
| // We always filter the gradient table. Each table is one row of a texture, so always y-clamp. |
| GrTextureParams params; |
| params.setBilerp(true); |
| params.setTileModeX(tileMode); |
| |
| fRow = fAtlas->lockRow(bitmap); |
| if (-1 != fRow) { |
| fYCoord = fAtlas->getYOffset(fRow) + SK_ScalarHalf * |
| fAtlas->getVerticalScaleFactor(); |
| fTextureAccess.reset(fAtlas->getTexture(), params); |
| } else { |
| GrTexture* texture = GrLockAndRefCachedBitmapTexture(ctx, bitmap, ¶ms); |
| fTextureAccess.reset(texture, params); |
| fYCoord = SK_ScalarHalf; |
| |
| // Unlock immediately, this is not great, but we don't have a way of |
| // knowing when else to unlock it currently, so it may get purged from |
| // the cache, but it'll still be ref'd until it's no longer being used. |
| GrUnlockAndUnrefCachedBitmapTexture(texture); |
| } |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| GrGradientEffect::~GrGradientEffect() { |
| if (this->useAtlas()) { |
| fAtlas->unlockRow(fRow); |
| } |
| } |
| |
| bool GrGradientEffect::onIsEqual(const GrEffect& effect) const { |
| const GrGradientEffect& s = CastEffect<GrGradientEffect>(effect); |
| return fTextureAccess.getTexture() == s.fTextureAccess.getTexture() && |
| fTextureAccess.getParams().getTileModeX() == |
| s.fTextureAccess.getParams().getTileModeX() && |
| this->useAtlas() == s.useAtlas() && |
| fYCoord == s.getYCoord() && |
| fMatrix.cheapEqualTo(s.getMatrix()); |
| } |
| |
| void GrGradientEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { |
| if (fIsOpaque && (kA_ValidComponentFlag & *validFlags) && 0xff == GrColorUnpackA(*color)) { |
| *validFlags = kA_ValidComponentFlag; |
| } else { |
| *validFlags = 0; |
| } |
| } |
| |
| int GrGradientEffect::RandomGradientParams(SkRandom* random, |
| SkColor colors[], |
| SkScalar** stops, |
| SkShader::TileMode* tm) { |
| int outColors = random->nextRangeU(1, kMaxRandomGradientColors); |
| |
| // if one color, omit stops, otherwise randomly decide whether or not to |
| if (outColors == 1 || (outColors >= 2 && random->nextBool())) { |
| *stops = NULL; |
| } |
| |
| SkScalar stop = 0.f; |
| for (int i = 0; i < outColors; ++i) { |
| colors[i] = random->nextU(); |
| if (NULL != *stops) { |
| (*stops)[i] = stop; |
| stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f; |
| } |
| } |
| *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount)); |
| |
| return outColors; |
| } |
| |
| #endif |
