| /* |
| * 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 "SkArenaAlloc.h" |
| #include "SkAtomics.h" |
| #include "SkBitmapProcShader.h" |
| #include "SkColorShader.h" |
| #include "SkColorSpaceXformer.h" |
| #include "SkEmptyShader.h" |
| #include "SkMallocPixelRef.h" |
| #include "SkPaint.h" |
| #include "SkPicture.h" |
| #include "SkPictureShader.h" |
| #include "SkPM4fPriv.h" |
| #include "SkRasterPipeline.h" |
| #include "SkReadBuffer.h" |
| #include "SkScalar.h" |
| #include "SkShaderBase.h" |
| #include "SkTLazy.h" |
| #include "SkWriteBuffer.h" |
| #include "../jumper/SkJumper.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrFragmentProcessor.h" |
| #endif |
| |
| //#define SK_TRACK_SHADER_LIFETIME |
| |
| #ifdef SK_TRACK_SHADER_LIFETIME |
| static int32_t gShaderCounter; |
| #endif |
| |
| static inline void inc_shader_counter() { |
| #ifdef SK_TRACK_SHADER_LIFETIME |
| int32_t prev = sk_atomic_inc(&gShaderCounter); |
| SkDebugf("+++ shader counter %d\n", prev + 1); |
| #endif |
| } |
| static inline void dec_shader_counter() { |
| #ifdef SK_TRACK_SHADER_LIFETIME |
| int32_t prev = sk_atomic_dec(&gShaderCounter); |
| SkDebugf("--- shader counter %d\n", prev - 1); |
| #endif |
| } |
| |
| SkShaderBase::SkShaderBase(const SkMatrix* localMatrix) |
| : fLocalMatrix(localMatrix ? *localMatrix : SkMatrix::I()) { |
| inc_shader_counter(); |
| // Pre-cache so future calls to fLocalMatrix.getType() are threadsafe. |
| (void)fLocalMatrix.getType(); |
| } |
| |
| SkShaderBase::~SkShaderBase() { |
| dec_shader_counter(); |
| } |
| |
| void SkShaderBase::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| bool hasLocalM = !fLocalMatrix.isIdentity(); |
| buffer.writeBool(hasLocalM); |
| if (hasLocalM) { |
| buffer.writeMatrix(fLocalMatrix); |
| } |
| } |
| |
| bool SkShaderBase::computeTotalInverse(const SkMatrix& ctm, |
| const SkMatrix* outerLocalMatrix, |
| SkMatrix* totalInverse) const { |
| SkMatrix total = SkMatrix::Concat(ctm, fLocalMatrix); |
| if (outerLocalMatrix) { |
| total.preConcat(*outerLocalMatrix); |
| } |
| |
| return total.invert(totalInverse); |
| } |
| |
| bool SkShaderBase::asLuminanceColor(SkColor* colorPtr) const { |
| SkColor storage; |
| if (nullptr == colorPtr) { |
| colorPtr = &storage; |
| } |
| if (this->onAsLuminanceColor(colorPtr)) { |
| *colorPtr = SkColorSetA(*colorPtr, 0xFF); // we only return opaque |
| return true; |
| } |
| return false; |
| } |
| |
| SkShaderBase::Context* SkShaderBase::makeContext(const ContextRec& rec, SkArenaAlloc* alloc) const { |
| return this->computeTotalInverse(*rec.fMatrix, rec.fLocalMatrix, nullptr) |
| ? this->onMakeContext(rec, alloc) |
| : nullptr; |
| } |
| |
| SkShaderBase::Context* SkShaderBase::makeBurstPipelineContext(const ContextRec& rec, |
| SkArenaAlloc* alloc) const { |
| |
| SkASSERT(rec.fPreferredDstType == ContextRec::kPM4f_DstType); |
| |
| // Always use vanilla stages for perspective. |
| if (rec.fMatrix->hasPerspective() || fLocalMatrix.hasPerspective()) { |
| return nullptr; |
| } |
| |
| return this->computeTotalInverse(*rec.fMatrix, rec.fLocalMatrix, nullptr) |
| ? this->onMakeBurstPipelineContext(rec, alloc) |
| : nullptr; |
| } |
| |
| SkShaderBase::Context::Context(const SkShaderBase& shader, const ContextRec& rec) |
| : fShader(shader), fCTM(*rec.fMatrix) |
| { |
| // We should never use a context for RP-only shaders. |
| SkASSERT(!shader.isRasterPipelineOnly(*rec.fMatrix)); |
| // ... or for perspective. |
| SkASSERT(!rec.fMatrix->hasPerspective()); |
| SkASSERT(!rec.fLocalMatrix || !rec.fLocalMatrix->hasPerspective()); |
| |
| // Because the context parameters must be valid at this point, we know that the matrix is |
| // invertible. |
| SkAssertResult(fShader.computeTotalInverse(*rec.fMatrix, rec.fLocalMatrix, &fTotalInverse)); |
| |
| fPaintAlpha = rec.fPaint->getAlpha(); |
| } |
| |
| SkShaderBase::Context::~Context() {} |
| |
| void SkShaderBase::Context::shadeSpan4f(int x, int y, SkPM4f dst[], int count) { |
| const int N = 128; |
| SkPMColor tmp[N]; |
| while (count > 0) { |
| int n = SkTMin(count, N); |
| this->shadeSpan(x, y, tmp, n); |
| for (int i = 0; i < n; ++i) { |
| dst[i] = SkPM4f::FromPMColor(tmp[i]); |
| } |
| dst += n; |
| x += n; |
| count -= n; |
| } |
| } |
| |
| const SkMatrix& SkShader::getLocalMatrix() const { |
| return as_SB(this)->getLocalMatrix(); |
| } |
| |
| #ifdef SK_SUPPORT_LEGACY_SHADER_ISABITMAP |
| bool SkShader::isABitmap(SkBitmap* outTexture, SkMatrix* outMatrix, TileMode xy[2]) const { |
| return as_SB(this)->onIsABitmap(outTexture, outMatrix, xy); |
| } |
| #endif |
| |
| SkImage* SkShader::isAImage(SkMatrix* localMatrix, TileMode xy[2]) const { |
| return as_SB(this)->onIsAImage(localMatrix, xy); |
| } |
| |
| SkShader::GradientType SkShader::asAGradient(GradientInfo* info) const { |
| return kNone_GradientType; |
| } |
| |
| #if SK_SUPPORT_GPU |
| std::unique_ptr<GrFragmentProcessor> SkShaderBase::asFragmentProcessor(const AsFPArgs&) const { |
| return nullptr; |
| } |
| #endif |
| |
| sk_sp<SkShader> SkShader::makeAsALocalMatrixShader(SkMatrix*) const { |
| return nullptr; |
| } |
| |
| sk_sp<SkShader> SkShader::MakeEmptyShader() { return sk_make_sp<SkEmptyShader>(); } |
| |
| sk_sp<SkShader> SkShader::MakeColorShader(SkColor color) { return sk_make_sp<SkColorShader>(color); } |
| |
| sk_sp<SkShader> SkShader::MakeBitmapShader(const SkBitmap& src, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix) { |
| if (localMatrix && !localMatrix->invert(nullptr)) { |
| return nullptr; |
| } |
| return SkMakeBitmapShader(src, tmx, tmy, localMatrix, kIfMutable_SkCopyPixelsMode); |
| } |
| |
| sk_sp<SkShader> SkShader::MakePictureShader(sk_sp<SkPicture> src, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix, const SkRect* tile) { |
| if (localMatrix && !localMatrix->invert(nullptr)) { |
| return nullptr; |
| } |
| return SkPictureShader::Make(std::move(src), tmx, tmy, localMatrix, tile); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkShaderBase::toString(SkString* str) const { |
| if (!fLocalMatrix.isIdentity()) { |
| str->append(" "); |
| fLocalMatrix.toString(str); |
| } |
| } |
| #endif |
| |
| bool SkShaderBase::appendStages(SkRasterPipeline* p, |
| SkColorSpace* dstCS, |
| SkArenaAlloc* alloc, |
| const SkMatrix& ctm, |
| const SkPaint& paint, |
| const SkMatrix* localM) const { |
| return this->onAppendStages(p, dstCS, alloc, ctm, paint, localM); |
| } |
| |
| bool SkShaderBase::onAppendStages(SkRasterPipeline* p, |
| SkColorSpace* dstCS, |
| SkArenaAlloc* alloc, |
| const SkMatrix& ctm, |
| const SkPaint& paint, |
| const SkMatrix* localM) const { |
| // SkShader::Context::shadeSpan4f() handles the paint opacity internally, |
| // but SkRasterPipelineBlitter applies it as a separate stage. |
| // We skip the internal shadeSpan4f() step by forcing the paint opaque. |
| SkTCopyOnFirstWrite<SkPaint> opaquePaint(paint); |
| if (paint.getAlpha() != SK_AlphaOPAQUE) { |
| opaquePaint.writable()->setAlpha(SK_AlphaOPAQUE); |
| } |
| |
| ContextRec rec(*opaquePaint, ctm, localM, ContextRec::kPM4f_DstType, dstCS); |
| |
| struct CallbackCtx : SkJumper_CallbackCtx { |
| sk_sp<SkShader> shader; |
| Context* ctx; |
| }; |
| auto cb = alloc->make<CallbackCtx>(); |
| cb->shader = dstCS ? SkColorSpaceXformer::Make(sk_ref_sp(dstCS))->apply(this) |
| : sk_ref_sp((SkShader*)this); |
| cb->ctx = as_SB(cb->shader)->makeContext(rec, alloc); |
| cb->fn = [](SkJumper_CallbackCtx* self, int active_pixels) { |
| auto c = (CallbackCtx*)self; |
| int x = (int)c->rgba[0], |
| y = (int)c->rgba[1]; |
| c->ctx->shadeSpan4f(x,y, (SkPM4f*)c->rgba, active_pixels); |
| }; |
| |
| if (cb->ctx) { |
| p->append(SkRasterPipeline::seed_shader); |
| p->append(SkRasterPipeline::callback, cb); |
| return true; |
| } |
| return false; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkFlattenable> SkEmptyShader::CreateProc(SkReadBuffer&) { |
| return SkShader::MakeEmptyShader(); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| #include "SkEmptyShader.h" |
| |
| void SkEmptyShader::toString(SkString* str) const { |
| str->append("SkEmptyShader: ("); |
| |
| this->INHERITED::toString(str); |
| |
| str->append(")"); |
| } |
| #endif |