| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkArenaAlloc.h" |
| #include "SkAutoBlitterChoose.h" |
| #include "SkColorShader.h" |
| #include "SkDraw.h" |
| #include "SkNx.h" |
| #include "SkPM4fPriv.h" |
| #include "SkRasterClip.h" |
| #include "SkScan.h" |
| #include "SkShader.h" |
| #include "SkString.h" |
| #include "SkVertState.h" |
| |
| #include "SkRasterPipeline.h" |
| #include "SkArenaAlloc.h" |
| #include "SkCoreBlitters.h" |
| #include "SkColorSpaceXform.h" |
| #include "SkColorSpace_Base.h" |
| |
| struct Matrix43 { |
| float fMat[12]; // column major |
| |
| Sk4f map(float x, float y) const { |
| return Sk4f::Load(&fMat[0]) * x + Sk4f::Load(&fMat[4]) * y + Sk4f::Load(&fMat[8]); |
| } |
| |
| void setConcat(const Matrix43& a, const SkMatrix& b) { |
| fMat[ 0] = a.dot(0, b.getScaleX(), b.getSkewY()); |
| fMat[ 1] = a.dot(1, b.getScaleX(), b.getSkewY()); |
| fMat[ 2] = a.dot(2, b.getScaleX(), b.getSkewY()); |
| fMat[ 3] = a.dot(3, b.getScaleX(), b.getSkewY()); |
| |
| fMat[ 4] = a.dot(0, b.getSkewX(), b.getScaleY()); |
| fMat[ 5] = a.dot(1, b.getSkewX(), b.getScaleY()); |
| fMat[ 6] = a.dot(2, b.getSkewX(), b.getScaleY()); |
| fMat[ 7] = a.dot(3, b.getSkewX(), b.getScaleY()); |
| |
| fMat[ 8] = a.dot(0, b.getTranslateX(), b.getTranslateY()) + a.fMat[ 8]; |
| fMat[ 9] = a.dot(1, b.getTranslateX(), b.getTranslateY()) + a.fMat[ 9]; |
| fMat[10] = a.dot(2, b.getTranslateX(), b.getTranslateY()) + a.fMat[10]; |
| fMat[11] = a.dot(3, b.getTranslateX(), b.getTranslateY()) + a.fMat[11]; |
| } |
| |
| private: |
| float dot(int index, float x, float y) const { |
| return fMat[index + 0] * x + fMat[index + 4] * y; |
| } |
| }; |
| |
| static SkScan::HairRCProc ChooseHairProc(bool doAntiAlias) { |
| return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine; |
| } |
| |
| static bool texture_to_matrix(const VertState& state, const SkPoint verts[], |
| const SkPoint texs[], SkMatrix* matrix) { |
| SkPoint src[3], dst[3]; |
| |
| src[0] = texs[state.f0]; |
| src[1] = texs[state.f1]; |
| src[2] = texs[state.f2]; |
| dst[0] = verts[state.f0]; |
| dst[1] = verts[state.f1]; |
| dst[2] = verts[state.f2]; |
| return matrix->setPolyToPoly(src, dst, 3); |
| } |
| |
| class SkTriColorShader : public SkShader { |
| public: |
| SkTriColorShader(); |
| |
| class TriColorShaderContext : public SkShader::Context { |
| public: |
| TriColorShaderContext(const SkTriColorShader& shader, const ContextRec&); |
| ~TriColorShaderContext() override; |
| void shadeSpan(int x, int y, SkPMColor dstC[], int count) override; |
| void shadeSpan4f(int x, int y, SkPM4f dstC[], int count) override; |
| |
| private: |
| bool setup(const SkPoint pts[], const SkColor colors[], int, int, int); |
| |
| SkMatrix fDstToUnit; |
| SkPMColor fColors[3]; |
| bool fSetup; |
| |
| Matrix43 fM43; |
| |
| typedef SkShader::Context INHERITED; |
| }; |
| |
| struct TriColorShaderData { |
| const SkPoint* pts; |
| const SkColor* colors; |
| const VertState *state; |
| }; |
| |
| SK_TO_STRING_OVERRIDE() |
| |
| // For serialization. This will never be called. |
| Factory getFactory() const override { sk_throw(); return nullptr; } |
| |
| // Supply setup data to context from drawing setup |
| void bindSetupData(TriColorShaderData* setupData) { fSetupData = setupData; } |
| |
| // Take the setup data from context when needed. |
| TriColorShaderData* takeSetupData() { |
| TriColorShaderData *data = fSetupData; |
| fSetupData = NULL; |
| return data; |
| } |
| |
| protected: |
| Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const override { |
| return alloc->make<TriColorShaderContext>(*this, rec); |
| } |
| |
| private: |
| TriColorShaderData *fSetupData; |
| |
| typedef SkShader INHERITED; |
| }; |
| |
| bool SkTriColorShader::TriColorShaderContext::setup(const SkPoint pts[], const SkColor colors[], |
| int index0, int index1, int index2) { |
| |
| fColors[0] = SkPreMultiplyColor(colors[index0]); |
| fColors[1] = SkPreMultiplyColor(colors[index1]); |
| fColors[2] = SkPreMultiplyColor(colors[index2]); |
| |
| SkMatrix m, im; |
| m.reset(); |
| m.set(0, pts[index1].fX - pts[index0].fX); |
| m.set(1, pts[index2].fX - pts[index0].fX); |
| m.set(2, pts[index0].fX); |
| m.set(3, pts[index1].fY - pts[index0].fY); |
| m.set(4, pts[index2].fY - pts[index0].fY); |
| m.set(5, pts[index0].fY); |
| if (!m.invert(&im)) { |
| return false; |
| } |
| // We can't call getTotalInverse(), because we explicitly don't want to look at the localmatrix |
| // as our interators are intrinsically tied to the vertices, and nothing else. |
| SkMatrix ctmInv; |
| if (!this->getCTM().invert(&ctmInv)) { |
| return false; |
| } |
| // TODO replace INV(m) * INV(ctm) with INV(ctm * m) |
| fDstToUnit.setConcat(im, ctmInv); |
| |
| Sk4f alpha(this->getPaintAlpha() * (1.0f / 255)), |
| c0 = SkPM4f::FromPMColor(fColors[0]).to4f() * alpha, |
| c1 = SkPM4f::FromPMColor(fColors[1]).to4f() * alpha, |
| c2 = SkPM4f::FromPMColor(fColors[2]).to4f() * alpha; |
| |
| Matrix43 colorm; |
| (c1 - c0).store(&colorm.fMat[0]); |
| (c2 - c0).store(&colorm.fMat[4]); |
| c0.store(&colorm.fMat[8]); |
| fM43.setConcat(colorm, fDstToUnit); |
| |
| return true; |
| } |
| |
| #include "SkColorPriv.h" |
| #include "SkComposeShader.h" |
| |
| static int ScalarTo256(SkScalar v) { |
| return static_cast<int>(SkScalarPin(v, 0, 1) * 256 + 0.5); |
| } |
| |
| SkTriColorShader::SkTriColorShader() |
| : INHERITED(NULL) |
| , fSetupData(NULL) {} |
| |
| SkTriColorShader::TriColorShaderContext::TriColorShaderContext(const SkTriColorShader& shader, |
| const ContextRec& rec) |
| : INHERITED(shader, rec) |
| , fSetup(false) {} |
| |
| SkTriColorShader::TriColorShaderContext::~TriColorShaderContext() {} |
| |
| void SkTriColorShader::TriColorShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
| SkTriColorShader* parent = static_cast<SkTriColorShader*>(const_cast<SkShader*>(&fShader)); |
| TriColorShaderData* set = parent->takeSetupData(); |
| if (set) { |
| fSetup = setup(set->pts, set->colors, set->state->f0, set->state->f1, set->state->f2); |
| } |
| |
| if (!fSetup) { |
| // Invalid matrices. Not checked before so no need to assert. |
| return; |
| } |
| |
| const int alphaScale = Sk255To256(this->getPaintAlpha()); |
| |
| SkPoint src; |
| |
| fDstToUnit.mapXY(SkIntToScalar(x) + 0.5, SkIntToScalar(y) + 0.5, &src); |
| for (int i = 0; i < count; i++) { |
| int scale1 = ScalarTo256(src.fX); |
| int scale2 = ScalarTo256(src.fY); |
| int scale0 = 256 - scale1 - scale2; |
| if (scale0 < 0) { |
| if (scale1 > scale2) { |
| scale2 = 256 - scale1; |
| } else { |
| scale1 = 256 - scale2; |
| } |
| scale0 = 0; |
| } |
| |
| if (256 != alphaScale) { |
| scale0 = SkAlphaMul(scale0, alphaScale); |
| scale1 = SkAlphaMul(scale1, alphaScale); |
| scale2 = SkAlphaMul(scale2, alphaScale); |
| } |
| |
| dstC[i] = SkAlphaMulQ(fColors[0], scale0) + |
| SkAlphaMulQ(fColors[1], scale1) + |
| SkAlphaMulQ(fColors[2], scale2); |
| |
| src.fX += fDstToUnit.getScaleX(); |
| src.fY += fDstToUnit.getSkewY(); |
| } |
| } |
| |
| void SkTriColorShader::TriColorShaderContext::shadeSpan4f(int x, int y, SkPM4f dstC[], int count) { |
| SkTriColorShader* parent = static_cast<SkTriColorShader*>(const_cast<SkShader*>(&fShader)); |
| TriColorShaderData* set = parent->takeSetupData(); |
| if (set) { |
| fSetup = setup(set->pts, set->colors, set->state->f0, set->state->f1, set->state->f2); |
| } |
| |
| if (!fSetup) { |
| // Invalid matrices. Not checked before so no need to assert. |
| return; |
| } |
| |
| Sk4f c = fM43.map(SkIntToScalar(x) + 0.5, SkIntToScalar(y) + 0.5), |
| dc = Sk4f::Load(&fM43.fMat[0]), |
| zero(0.0f), |
| one(1.0f); |
| |
| for (int i = 0; i < count; i++) { |
| // We don't expect to be wildly out of 0...1, but we pin just because of minor |
| // numerical imprecision. |
| Sk4f::Min(Sk4f::Max(c, zero), Sk4f::Min(c[3], one)).store(dstC + i); |
| c += dc; |
| } |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkTriColorShader::toString(SkString* str) const { |
| str->append("SkTriColorShader: ("); |
| |
| this->INHERITED::toString(str); |
| |
| str->append(")"); |
| } |
| #endif |
| |
| |
| namespace { |
| |
| // Similar to SkLocalMatrixShader, but composes the local matrix with the CTM (instead |
| // of composing with the inherited local matrix): |
| // |
| // rec' = {rec.ctm x localMatrix, rec.localMatrix} |
| // |
| // (as opposed to rec' = {rec.ctm, rec.localMatrix x localMatrix}) |
| // |
| class SkLocalInnerMatrixShader final : public SkShader { |
| public: |
| SkLocalInnerMatrixShader(sk_sp<SkShader> proxy, const SkMatrix& localMatrix) |
| : INHERITED(&localMatrix) |
| , fProxyShader(std::move(proxy)) {} |
| |
| Factory getFactory() const override { |
| SkASSERT(false); |
| return nullptr; |
| } |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override { |
| SkASSERT(false); |
| } |
| |
| Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const override { |
| SkMatrix adjustedCTM = SkMatrix::Concat(*rec.fMatrix, this->getLocalMatrix()); |
| ContextRec newRec(rec); |
| newRec.fMatrix = &adjustedCTM; |
| return fProxyShader->makeContext(newRec, alloc); |
| } |
| |
| bool onAppendStages(SkRasterPipeline* p, SkColorSpace* cs, SkArenaAlloc* alloc, |
| const SkMatrix& ctm, const SkPaint& paint, |
| const SkMatrix* localM) const override { |
| // We control the shader graph ancestors, so we know there's no local matrix being |
| // injected before this. |
| SkASSERT(!localM); |
| |
| SkMatrix adjustedCTM = SkMatrix::Concat(ctm, this->getLocalMatrix()); |
| return fProxyShader->appendStages(p, cs, alloc, adjustedCTM, paint); |
| } |
| |
| private: |
| sk_sp<SkShader> fProxyShader; |
| |
| typedef SkShader INHERITED; |
| }; |
| |
| sk_sp<SkShader> MakeTextureShader(const VertState& state, const SkPoint verts[], |
| const SkPoint texs[], const SkPaint& paint, |
| SkColorSpace* dstColorSpace, |
| SkArenaAlloc* alloc) { |
| SkASSERT(paint.getShader()); |
| |
| const auto& p0 = texs[state.f0], |
| p1 = texs[state.f1], |
| p2 = texs[state.f2]; |
| |
| if (p0 != p1 || p0 != p2) { |
| // Common case (non-collapsed texture coordinates). |
| // Map the texture to vertices using a local transform. |
| |
| // We cannot use a plain SkLocalMatrix shader, because we need the texture matrix |
| // to compose next to the CTM. |
| SkMatrix localMatrix; |
| return texture_to_matrix(state, verts, texs, &localMatrix) |
| ? alloc->makeSkSp<SkLocalInnerMatrixShader>(paint.refShader(), localMatrix) |
| : nullptr; |
| } |
| |
| // Collapsed texture coordinates special case. |
| // The texture is a solid color, sampled at the given point. |
| SkMatrix shaderInvLocalMatrix; |
| SkAssertResult(paint.getShader()->getLocalMatrix().invert(&shaderInvLocalMatrix)); |
| |
| const auto sample = SkPoint::Make(0.5f, 0.5f); |
| const auto mappedSample = shaderInvLocalMatrix.mapXY(sample.x(), sample.y()), |
| mappedPoint = shaderInvLocalMatrix.mapXY(p0.x(), p0.y()); |
| const auto localMatrix = SkMatrix::MakeTrans(mappedSample.x() - mappedPoint.x(), |
| mappedSample.y() - mappedPoint.y()); |
| |
| SkShader::ContextRec rec(paint, SkMatrix::I(), &localMatrix, |
| SkShader::ContextRec::kPMColor_DstType, dstColorSpace); |
| auto* ctx = paint.getShader()->makeContext(rec, alloc); |
| if (!ctx) { |
| return nullptr; |
| } |
| |
| SkPMColor pmColor; |
| ctx->shadeSpan(SkScalarFloorToInt(sample.x()), SkScalarFloorToInt(sample.y()), &pmColor, 1); |
| |
| // no need to keep this temp context around. |
| alloc->reset(); |
| |
| return alloc->makeSkSp<SkColorShader>(SkUnPreMultiply::PMColorToColor(pmColor)); |
| } |
| } // anonymous ns |
| |
| static bool update_tricolor_matrix(const SkMatrix& ctmInv, |
| const SkPoint pts[], const SkPM4f colors[], |
| int index0, int index1, int index2, Matrix43* result) { |
| SkMatrix m, im; |
| m.reset(); |
| m.set(0, pts[index1].fX - pts[index0].fX); |
| m.set(1, pts[index2].fX - pts[index0].fX); |
| m.set(2, pts[index0].fX); |
| m.set(3, pts[index1].fY - pts[index0].fY); |
| m.set(4, pts[index2].fY - pts[index0].fY); |
| m.set(5, pts[index0].fY); |
| if (!m.invert(&im)) { |
| return false; |
| } |
| |
| SkMatrix dstToUnit; |
| dstToUnit.setConcat(im, ctmInv); |
| |
| Sk4f c0 = colors[index0].to4f(), |
| c1 = colors[index1].to4f(), |
| c2 = colors[index2].to4f(); |
| |
| Matrix43 colorm; |
| (c1 - c0).store(&colorm.fMat[0]); |
| (c2 - c0).store(&colorm.fMat[4]); |
| c0.store(&colorm.fMat[8]); |
| result->setConcat(colorm, dstToUnit); |
| return true; |
| } |
| |
| static SkPM4f* convert_colors(const SkColor src[], int count, SkColorSpace* deviceCS, |
| SkArenaAlloc* alloc) { |
| SkPM4f* dst = alloc->makeArray<SkPM4f>(count); |
| if (!deviceCS) { |
| for (int i = 0; i < count; ++i) { |
| dst[i] = SkPM4f_from_SkColor(src[i], nullptr); |
| } |
| } else { |
| auto srcCS = SkColorSpace::MakeSRGB(); |
| auto dstCS = as_CSB(deviceCS)->makeLinearGamma(); |
| SkColorSpaceXform::Apply(dstCS.get(), SkColorSpaceXform::kRGBA_F32_ColorFormat, dst, |
| srcCS.get(), SkColorSpaceXform::kBGRA_8888_ColorFormat, src, |
| count, SkColorSpaceXform::kPremul_AlphaOp); |
| } |
| return dst; |
| } |
| |
| static bool compute_is_opaque(const SkColor colors[], int count) { |
| uint32_t c = ~0; |
| for (int i = 0; i < count; ++i) { |
| c &= colors[i]; |
| } |
| return SkColorGetA(c) == 0xFF; |
| } |
| |
| void SkDraw::drawVertices(SkVertices::VertexMode vmode, int count, |
| const SkPoint vertices[], const SkPoint textures[], |
| const SkColor colors[], SkBlendMode bmode, |
| const uint16_t indices[], int indexCount, |
| const SkPaint& paint) const { |
| SkASSERT(0 == count || vertices); |
| |
| // abort early if there is nothing to draw |
| if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) { |
| return; |
| } |
| SkMatrix ctmInv; |
| if (!fMatrix->invert(&ctmInv)) { |
| return; |
| } |
| |
| // transform out vertices into device coordinates |
| SkAutoSTMalloc<16, SkPoint> storage(count); |
| SkPoint* devVerts = storage.get(); |
| fMatrix->mapPoints(devVerts, vertices, count); |
| |
| /* |
| We can draw the vertices in 1 of 4 ways: |
| |
| - solid color (no shader/texture[], no colors[]) |
| - just colors (no shader/texture[], has colors[]) |
| - just texture (has shader/texture[], no colors[]) |
| - colors * texture (has shader/texture[], has colors[]) |
| |
| Thus for texture drawing, we need both texture[] and a shader. |
| */ |
| |
| if (colors && !textures) { |
| char arenaStorage[4096]; |
| SkArenaAlloc alloc(arenaStorage, sizeof(storage)); |
| Matrix43 matrix43; |
| SkRasterPipeline shaderPipeline; |
| |
| // Convert the SkColors into float colors. The conversion depends on some conditions: |
| // - If the pixmap has a dst colorspace, we have to be "color-correct". |
| // Do we map into dst-colorspace before or after we interpolate? |
| // - We have to decide when to apply per-color alpha (before or after we interpolate) |
| // |
| // For now, we will take a simple approach, but recognize this is just a start: |
| // - convert colors into dst colorspace before interpolation (matches gradients) |
| // - apply per-color alpha before interpolation (matches old version of vertices) |
| // |
| SkPM4f* dstColors = convert_colors(colors, count, fDst.colorSpace(), &alloc); |
| |
| bool is_opaque; |
| if (paint.getAlpha() == 0xff) { |
| is_opaque = compute_is_opaque(colors, count); |
| } else { |
| is_opaque = false; |
| Sk4f alpha = paint.getAlpha() * (1/255.0f); |
| for (int i = 0; i < count; i++) { |
| (dstColors[i].to4f() * alpha).store(dstColors + i); |
| } |
| } |
| |
| shaderPipeline.append(SkRasterPipeline::matrix_4x3, &matrix43); |
| // In theory we should never need to clamp. However, either due to imprecision in our |
| // matrix43, or the scan converter passing us pixel centers that in fact are not within |
| // the triangle, we do see occasional (slightly) out-of-range values, so we add these |
| // clamp stages. It would be nice to find a way to detect when these are not needed. |
| shaderPipeline.append(SkRasterPipeline::clamp_0); |
| shaderPipeline.append(SkRasterPipeline::clamp_a); |
| |
| bool wants_dither = paint.isDither(); |
| auto blitter = SkCreateRasterPipelineBlitter(fDst, paint, shaderPipeline, |
| is_opaque, wants_dither, &alloc); |
| SkASSERT(!blitter->isNullBlitter()); |
| |
| // setup our state and function pointer for iterating triangles |
| VertState state(count, indices, indexCount); |
| VertState::Proc vertProc = state.chooseProc(vmode); |
| |
| while (vertProc(&state)) { |
| SkPoint tmp[] = { |
| devVerts[state.f0], devVerts[state.f1], devVerts[state.f2] |
| }; |
| if (update_tricolor_matrix(ctmInv, vertices, dstColors, state.f0, state.f1, state.f2, |
| &matrix43)) { |
| SkScan::FillTriangle(tmp, *fRC, blitter); |
| } |
| } |
| return; |
| } |
| |
| auto triShader = sk_make_sp<SkTriColorShader>(); |
| SkPaint p(paint); |
| |
| SkShader* shader = p.getShader(); |
| if (nullptr == shader) { |
| // if we have no shader, we ignore the texture coordinates |
| textures = nullptr; |
| } else if (nullptr == textures) { |
| // if we don't have texture coordinates, ignore the shader |
| p.setShader(nullptr); |
| shader = nullptr; |
| } |
| |
| // setup the custom shader (if needed) |
| if (colors) { |
| if (nullptr == textures) { |
| // just colors (no texture) |
| p.setShader(triShader); |
| } else { |
| // colors * texture |
| SkASSERT(shader); |
| p.setShader(SkShader::MakeComposeShader(triShader, sk_ref_sp(shader), bmode)); |
| } |
| } |
| |
| SkAutoBlitterChoose blitter(fDst, *fMatrix, p); |
| // Abort early if we failed to create a shader context. |
| if (blitter->isNullBlitter()) { |
| return; |
| } |
| |
| // setup our state and function pointer for iterating triangles |
| VertState state(count, indices, indexCount); |
| VertState::Proc vertProc = state.chooseProc(vmode); |
| |
| if (textures || colors) { |
| SkTriColorShader::TriColorShaderData verticesSetup = { vertices, colors, &state }; |
| |
| while (vertProc(&state)) { |
| auto* blitterPtr = blitter.get(); |
| |
| // We're going to allocate at most |
| // |
| // * one SkLocalMatrixShader OR one SkColorShader |
| // * one SkComposeShader |
| // * one SkAutoBlitterChoose |
| // |
| static constexpr size_t kAllocSize = |
| sizeof(SkAutoBlitterChoose) + sizeof(SkComposeShader) + |
| SkTMax(sizeof(SkLocalInnerMatrixShader), sizeof(SkColorShader)); |
| char allocBuffer[kAllocSize]; |
| SkArenaAlloc alloc(allocBuffer); |
| |
| if (textures) { |
| sk_sp<SkShader> texShader = MakeTextureShader(state, vertices, textures, paint, |
| fDst.colorSpace(), &alloc); |
| if (texShader) { |
| SkPaint localPaint(p); |
| localPaint.setShader(colors |
| ? alloc.makeSkSp<SkComposeShader>(triShader, std::move(texShader), bmode) |
| : std::move(texShader)); |
| |
| blitterPtr = alloc.make<SkAutoBlitterChoose>(fDst, *fMatrix, localPaint)->get(); |
| if (blitterPtr->isNullBlitter()) { |
| continue; |
| } |
| } |
| } |
| if (colors) { |
| triShader->bindSetupData(&verticesSetup); |
| } |
| |
| SkPoint tmp[] = { |
| devVerts[state.f0], devVerts[state.f1], devVerts[state.f2] |
| }; |
| SkScan::FillTriangle(tmp, *fRC, blitterPtr); |
| triShader->bindSetupData(nullptr); |
| } |
| } else { |
| // no colors[] and no texture, stroke hairlines with paint's color. |
| SkScan::HairRCProc hairProc = ChooseHairProc(paint.isAntiAlias()); |
| const SkRasterClip& clip = *fRC; |
| while (vertProc(&state)) { |
| SkPoint array[] = { |
| devVerts[state.f0], devVerts[state.f1], devVerts[state.f2], devVerts[state.f0] |
| }; |
| hairProc(array, 4, clip, blitter.get()); |
| } |
| } |
| } |