| /* |
| * 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 "include/core/SkPaint.h" |
| |
| #include "include/core/SkData.h" |
| #include "include/core/SkGraphics.h" |
| #include "include/core/SkImageFilter.h" |
| #include "include/core/SkMaskFilter.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkStrokeRec.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/private/SkMutex.h" |
| #include "include/private/SkTo.h" |
| #include "src/core/SkBlenderBase.h" |
| #include "src/core/SkColorFilterBase.h" |
| #include "src/core/SkColorSpacePriv.h" |
| #include "src/core/SkColorSpaceXformSteps.h" |
| #include "src/core/SkDraw.h" |
| #include "src/core/SkMaskGamma.h" |
| #include "src/core/SkOpts.h" |
| #include "src/core/SkPaintDefaults.h" |
| #include "src/core/SkPaintPriv.h" |
| #include "src/core/SkPathEffectBase.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSafeRange.h" |
| #include "src/core/SkStringUtils.h" |
| #include "src/core/SkStroke.h" |
| #include "src/core/SkSurfacePriv.h" |
| #include "src/core/SkTLazy.h" |
| #include "src/core/SkWriteBuffer.h" |
| #include "src/shaders/SkShaderBase.h" |
| |
| // define this to get a printf for out-of-range parameter in setters |
| // e.g. setTextSize(-1) |
| //#define SK_REPORT_API_RANGE_CHECK |
| |
| |
| SkPaint::SkPaint() |
| : fColor4f{0, 0, 0, 1} // opaque black |
| , fWidth{0} |
| , fMiterLimit{SkPaintDefaults_MiterLimit} |
| , fBitfields{(unsigned)false, // fAntiAlias |
| (unsigned)false, // fDither |
| (unsigned)SkPaint::kDefault_Cap, // fCapType |
| (unsigned)SkPaint::kDefault_Join, // fJoinType |
| (unsigned)SkPaint::kFill_Style, // fStyle |
| 0} // fPadding |
| { |
| static_assert(sizeof(fBitfields) == sizeof(fBitfieldsUInt), ""); |
| } |
| |
| SkPaint::SkPaint(const SkColor4f& color, SkColorSpace* colorSpace) : SkPaint() { |
| this->setColor(color, colorSpace); |
| } |
| |
| SkPaint::SkPaint(const SkPaint& src) = default; |
| |
| SkPaint::SkPaint(SkPaint&& src) = default; |
| |
| SkPaint::~SkPaint() = default; |
| |
| SkPaint& SkPaint::operator=(const SkPaint& src) = default; |
| |
| SkPaint& SkPaint::operator=(SkPaint&& src) = default; |
| |
| bool operator==(const SkPaint& a, const SkPaint& b) { |
| #define EQUAL(field) (a.field == b.field) |
| return EQUAL(fPathEffect) |
| && EQUAL(fShader) |
| && EQUAL(fMaskFilter) |
| && EQUAL(fColorFilter) |
| && EQUAL(fBlender) |
| && EQUAL(fImageFilter) |
| && EQUAL(fColor4f) |
| && EQUAL(fWidth) |
| && EQUAL(fMiterLimit) |
| && EQUAL(fBitfieldsUInt) |
| ; |
| #undef EQUAL |
| } |
| |
| #define DEFINE_FIELD_REF(type) \ |
| sk_sp<Sk##type> SkPaint::ref##type() const { return f##type; } |
| DEFINE_FIELD_REF(ColorFilter) |
| DEFINE_FIELD_REF(Blender) |
| DEFINE_FIELD_REF(ImageFilter) |
| DEFINE_FIELD_REF(MaskFilter) |
| DEFINE_FIELD_REF(PathEffect) |
| DEFINE_FIELD_REF(Shader) |
| #undef DEFINE_FIELD_REF |
| |
| #define DEFINE_FIELD_SET(Field) \ |
| void SkPaint::set##Field(sk_sp<Sk##Field> f) { f##Field = std::move(f); } |
| DEFINE_FIELD_SET(ColorFilter) |
| DEFINE_FIELD_SET(ImageFilter) |
| DEFINE_FIELD_SET(MaskFilter) |
| DEFINE_FIELD_SET(PathEffect) |
| DEFINE_FIELD_SET(Shader) |
| #undef DEFINE_FIELD_SET |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPaint::reset() { *this = SkPaint(); } |
| |
| void SkPaint::setStyle(Style style) { |
| if ((unsigned)style < kStyleCount) { |
| fBitfields.fStyle = style; |
| } else { |
| #ifdef SK_REPORT_API_RANGE_CHECK |
| SkDebugf("SkPaint::setStyle(%d) out of range\n", style); |
| #endif |
| } |
| } |
| |
| void SkPaint::setStroke(bool isStroke) { |
| fBitfields.fStyle = isStroke ? kStroke_Style : kFill_Style; |
| } |
| |
| void SkPaint::setColor(SkColor color) { |
| fColor4f = SkColor4f::FromColor(color); |
| } |
| |
| void SkPaint::setColor(const SkColor4f& color, SkColorSpace* colorSpace) { |
| SkColorSpaceXformSteps steps{colorSpace, kUnpremul_SkAlphaType, |
| sk_srgb_singleton(), kUnpremul_SkAlphaType}; |
| fColor4f = {color.fR, color.fG, color.fB, SkTPin(color.fA, 0.0f, 1.0f)}; |
| steps.apply(fColor4f.vec()); |
| } |
| |
| void SkPaint::setAlphaf(float a) { |
| fColor4f.fA = SkTPin(a, 0.0f, 1.0f); |
| } |
| |
| void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
| this->setColor(SkColorSetARGB(a, r, g, b)); |
| } |
| |
| std::optional<SkBlendMode> SkPaint::asBlendMode() const { |
| return fBlender ? as_BB(fBlender)->asBlendMode() |
| : SkBlendMode::kSrcOver; |
| } |
| |
| SkBlendMode SkPaint::getBlendMode_or(SkBlendMode defaultMode) const { |
| return this->asBlendMode().value_or(defaultMode); |
| } |
| |
| bool SkPaint::isSrcOver() const { |
| return !fBlender || as_BB(fBlender)->asBlendMode() == SkBlendMode::kSrcOver; |
| } |
| |
| void SkPaint::setBlendMode(SkBlendMode mode) { |
| this->setBlender(mode == SkBlendMode::kSrcOver ? nullptr : SkBlender::Mode(mode)); |
| } |
| |
| void SkPaint::setBlender(sk_sp<SkBlender> blender) { |
| fBlender = std::move(blender); |
| } |
| |
| void SkPaint::setStrokeWidth(SkScalar width) { |
| if (width >= 0) { |
| fWidth = width; |
| } else { |
| #ifdef SK_REPORT_API_RANGE_CHECK |
| SkDebugf("SkPaint::setStrokeWidth() called with negative value\n"); |
| #endif |
| } |
| } |
| |
| void SkPaint::setStrokeMiter(SkScalar limit) { |
| if (limit >= 0) { |
| fMiterLimit = limit; |
| } else { |
| #ifdef SK_REPORT_API_RANGE_CHECK |
| SkDebugf("SkPaint::setStrokeMiter() called with negative value\n"); |
| #endif |
| } |
| } |
| |
| void SkPaint::setStrokeCap(Cap ct) { |
| if ((unsigned)ct < kCapCount) { |
| fBitfields.fCapType = SkToU8(ct); |
| } else { |
| #ifdef SK_REPORT_API_RANGE_CHECK |
| SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct); |
| #endif |
| } |
| } |
| |
| void SkPaint::setStrokeJoin(Join jt) { |
| if ((unsigned)jt < kJoinCount) { |
| fBitfields.fJoinType = SkToU8(jt); |
| } else { |
| #ifdef SK_REPORT_API_RANGE_CHECK |
| SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt); |
| #endif |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "include/core/SkStream.h" |
| |
| #ifdef SK_DEBUG |
| static void ASSERT_FITS_IN(uint32_t value, int bitCount) { |
| SkASSERT(bitCount > 0 && bitCount <= 32); |
| uint32_t mask = ~0U; |
| mask >>= (32 - bitCount); |
| SkASSERT(0 == (value & ~mask)); |
| } |
| #else |
| #define ASSERT_FITS_IN(value, bitcount) |
| #endif |
| |
| enum FlatFlags { |
| kHasTypeface_FlatFlag = 0x1, |
| kHasEffects_FlatFlag = 0x2, |
| |
| kFlatFlagMask = 0x3, |
| }; |
| |
| // SkPaint originally defined flags, some of which now apply to SkFont. These are renames |
| // of those flags, split into categories depending on which objects they (now) apply to. |
| |
| template <typename T> uint32_t shift_bits(T value, unsigned shift, unsigned bits) { |
| SkASSERT(shift + bits <= 32); |
| uint32_t v = static_cast<uint32_t>(value); |
| ASSERT_FITS_IN(v, bits); |
| return v << shift; |
| } |
| |
| constexpr uint8_t CUSTOM_BLEND_MODE_SENTINEL = 0xFF; |
| |
| /* Packing the paint |
| flags : 8 // 2... |
| blend : 8 // 30+ |
| cap : 2 // 3 |
| join : 2 // 3 |
| style : 2 // 3 |
| filter: 2 // 4 |
| flat : 8 // 1... |
| total : 32 |
| */ |
| static uint32_t pack_v68(const SkPaint& paint, unsigned flatFlags) { |
| uint32_t packed = 0; |
| const auto bm = paint.asBlendMode(); |
| const unsigned mode = bm ? static_cast<unsigned>(bm.value()) |
| : CUSTOM_BLEND_MODE_SENTINEL; |
| |
| packed |= shift_bits(((unsigned)paint.isDither() << 1) | |
| (unsigned)paint.isAntiAlias(), 0, 8); |
| packed |= shift_bits(mode, 8, 8); |
| packed |= shift_bits(paint.getStrokeCap(), 16, 2); |
| packed |= shift_bits(paint.getStrokeJoin(), 18, 2); |
| packed |= shift_bits(paint.getStyle(), 20, 2); |
| packed |= shift_bits(0, 22, 2); // was filterquality |
| packed |= shift_bits(flatFlags, 24, 8); |
| return packed; |
| } |
| |
| static uint32_t unpack_v68(SkPaint* paint, uint32_t packed, SkSafeRange& safe) { |
| paint->setAntiAlias((packed & 1) != 0); |
| paint->setDither((packed & 2) != 0); |
| packed >>= 8; |
| { |
| unsigned mode = packed & 0xFF; |
| if (mode != CUSTOM_BLEND_MODE_SENTINEL) { // sentinel for custom blender |
| paint->setBlendMode(safe.checkLE(mode, SkBlendMode::kLastMode)); |
| } |
| // else we will unflatten the custom blender |
| } |
| packed >>= 8; |
| paint->setStrokeCap(safe.checkLE(packed & 0x3, SkPaint::kLast_Cap)); |
| packed >>= 2; |
| paint->setStrokeJoin(safe.checkLE(packed & 0x3, SkPaint::kLast_Join)); |
| packed >>= 2; |
| paint->setStyle(safe.checkLE(packed & 0x3, SkPaint::kStrokeAndFill_Style)); |
| packed >>= 2; |
| // skip the (now ignored) filterquality bits |
| packed >>= 2; |
| |
| return packed; |
| } |
| |
| /* To save space/time, we analyze the paint, and write a truncated version of |
| it if there are not tricky elements like shaders, etc. |
| */ |
| void SkPaintPriv::Flatten(const SkPaint& paint, SkWriteBuffer& buffer) { |
| uint8_t flatFlags = 0; |
| |
| if (paint.getPathEffect() || |
| paint.getShader() || |
| paint.getMaskFilter() || |
| paint.getColorFilter() || |
| paint.getImageFilter() || |
| !paint.asBlendMode()) { |
| flatFlags |= kHasEffects_FlatFlag; |
| } |
| |
| buffer.writeScalar(paint.getStrokeWidth()); |
| buffer.writeScalar(paint.getStrokeMiter()); |
| buffer.writeColor4f(paint.getColor4f()); |
| |
| buffer.write32(pack_v68(paint, flatFlags)); |
| |
| if (flatFlags & kHasEffects_FlatFlag) { |
| buffer.writeFlattenable(paint.getPathEffect()); |
| buffer.writeFlattenable(paint.getShader()); |
| buffer.writeFlattenable(paint.getMaskFilter()); |
| buffer.writeFlattenable(paint.getColorFilter()); |
| buffer.writeFlattenable(paint.getImageFilter()); |
| buffer.writeFlattenable(paint.getBlender()); |
| } |
| } |
| |
| SkPaint SkPaintPriv::Unflatten(SkReadBuffer& buffer) { |
| SkPaint paint; |
| |
| paint.setStrokeWidth(buffer.readScalar()); |
| paint.setStrokeMiter(buffer.readScalar()); |
| { |
| SkColor4f color; |
| buffer.readColor4f(&color); |
| paint.setColor(color, sk_srgb_singleton()); |
| } |
| |
| SkSafeRange safe; |
| unsigned flatFlags = unpack_v68(&paint, buffer.readUInt(), safe); |
| |
| if (!(flatFlags & kHasEffects_FlatFlag)) { |
| // This is a simple SkPaint without any effects, so clear all the effect-related fields. |
| paint.setPathEffect(nullptr); |
| paint.setShader(nullptr); |
| paint.setMaskFilter(nullptr); |
| paint.setColorFilter(nullptr); |
| paint.setImageFilter(nullptr); |
| } else if (buffer.isVersionLT(SkPicturePriv::kSkBlenderInSkPaint)) { |
| // This paint predates the introduction of user blend functions (via SkBlender). |
| paint.setPathEffect(buffer.readPathEffect()); |
| paint.setShader(buffer.readShader()); |
| paint.setMaskFilter(buffer.readMaskFilter()); |
| paint.setColorFilter(buffer.readColorFilter()); |
| (void)buffer.read32(); // was drawLooper (now deprecated) |
| paint.setImageFilter(buffer.readImageFilter()); |
| } else { |
| paint.setPathEffect(buffer.readPathEffect()); |
| paint.setShader(buffer.readShader()); |
| paint.setMaskFilter(buffer.readMaskFilter()); |
| paint.setColorFilter(buffer.readColorFilter()); |
| paint.setImageFilter(buffer.readImageFilter()); |
| paint.setBlender(buffer.readBlender()); |
| } |
| |
| if (!buffer.validate(safe.ok())) { |
| paint.reset(); |
| } |
| return paint; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool SkPaint::getFillPath(const SkPath& src, SkPath* dst, const SkRect* cullRect, |
| SkScalar resScale) const { |
| return this->getFillPath(src, dst, cullRect, SkMatrix::Scale(resScale, resScale)); |
| } |
| |
| bool SkPaint::getFillPath(const SkPath& src, SkPath* dst, const SkRect* cullRect, |
| const SkMatrix& ctm) const { |
| if (!src.isFinite()) { |
| dst->reset(); |
| return false; |
| } |
| |
| const SkScalar resScale = SkPaintPriv::ComputeResScaleForStroking(ctm); |
| SkStrokeRec rec(*this, resScale); |
| |
| #if defined(SK_BUILD_FOR_FUZZER) |
| // Prevent lines with small widths from timing out. |
| if (rec.getStyle() == SkStrokeRec::Style::kStroke_Style && rec.getWidth() < 0.001) { |
| return false; |
| } |
| #endif |
| |
| const SkPath* srcPtr = &src; |
| SkPath tmpPath; |
| |
| if (fPathEffect && fPathEffect->filterPath(&tmpPath, src, &rec, cullRect, ctm)) { |
| srcPtr = &tmpPath; |
| } |
| |
| if (!rec.applyToPath(dst, *srcPtr)) { |
| if (srcPtr == &tmpPath) { |
| // If path's were copy-on-write, this trick would not be needed. |
| // As it is, we want to save making a deep-copy from tmpPath -> dst |
| // since we know we're just going to delete tmpPath when we return, |
| // so the swap saves that copy. |
| dst->swap(tmpPath); |
| } else { |
| *dst = *srcPtr; |
| } |
| } |
| |
| if (!dst->isFinite()) { |
| dst->reset(); |
| return false; |
| } |
| return !rec.isHairlineStyle(); |
| } |
| |
| bool SkPaint::canComputeFastBounds() const { |
| if (this->getImageFilter() && !this->getImageFilter()->canComputeFastBounds()) { |
| return false; |
| } |
| // Pass nullptr for the bounds to determine if they can be computed |
| if (this->getPathEffect() && |
| !as_PEB(this->getPathEffect())->computeFastBounds(nullptr)) { |
| return false; |
| } |
| return true; |
| } |
| |
| const SkRect& SkPaint::computeFastBounds(const SkRect& orig, SkRect* storage) const { |
| // Things like stroking, etc... will do math on the bounds rect, assuming that it's sorted. |
| SkASSERT(orig.isSorted()); |
| SkPaint::Style style = this->getStyle(); |
| // ultra fast-case: filling with no effects that affect geometry |
| if (kFill_Style == style) { |
| uintptr_t effects = 0; |
| effects |= reinterpret_cast<uintptr_t>(this->getMaskFilter()); |
| effects |= reinterpret_cast<uintptr_t>(this->getPathEffect()); |
| effects |= reinterpret_cast<uintptr_t>(this->getImageFilter()); |
| if (!effects) { |
| return orig; |
| } |
| } |
| |
| return this->doComputeFastBounds(orig, storage, style); |
| } |
| |
| const SkRect& SkPaint::doComputeFastBounds(const SkRect& origSrc, |
| SkRect* storage, |
| Style style) const { |
| SkASSERT(storage); |
| |
| const SkRect* src = &origSrc; |
| |
| SkRect tmpSrc; |
| if (this->getPathEffect()) { |
| tmpSrc = origSrc; |
| SkAssertResult(as_PEB(this->getPathEffect())->computeFastBounds(&tmpSrc)); |
| src = &tmpSrc; |
| } |
| |
| SkScalar radius = SkStrokeRec::GetInflationRadius(*this, style); |
| *storage = src->makeOutset(radius, radius); |
| |
| if (this->getMaskFilter()) { |
| as_MFB(this->getMaskFilter())->computeFastBounds(*storage, storage); |
| } |
| |
| if (this->getImageFilter()) { |
| *storage = this->getImageFilter()->computeFastBounds(*storage); |
| } |
| |
| return *storage; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // return true if the filter exists, and may affect alpha |
| static bool affects_alpha(const SkColorFilter* cf) { |
| return cf && !as_CFB(cf)->isAlphaUnchanged(); |
| } |
| |
| // return true if the filter exists, and may affect alpha |
| static bool affects_alpha(const SkImageFilter* imf) { |
| // TODO: check if we should allow imagefilters to broadcast that they don't affect alpha |
| // ala colorfilters |
| return imf != nullptr; |
| } |
| |
| bool SkPaint::nothingToDraw() const { |
| auto bm = this->asBlendMode(); |
| if (!bm) { |
| return false; |
| } |
| switch (bm.value()) { |
| case SkBlendMode::kSrcOver: |
| case SkBlendMode::kSrcATop: |
| case SkBlendMode::kDstOut: |
| case SkBlendMode::kDstOver: |
| case SkBlendMode::kPlus: |
| if (0 == this->getAlpha()) { |
| return !affects_alpha(fColorFilter.get()) && !affects_alpha(fImageFilter.get()); |
| } |
| break; |
| case SkBlendMode::kDst: |
| return true; |
| default: |
| break; |
| } |
| return false; |
| } |