| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkLinearGradient.h" |
| |
| #include "Sk4fLinearGradient.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| |
| static SkMatrix pts_to_unit_matrix(const SkPoint pts[2]) { |
| SkVector vec = pts[1] - pts[0]; |
| SkScalar mag = vec.length(); |
| SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| |
| vec.scale(inv); |
| SkMatrix matrix; |
| matrix.setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| matrix.postTranslate(-pts[0].fX, -pts[0].fY); |
| matrix.postScale(inv, inv); |
| return matrix; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc) |
| : SkGradientShaderBase(desc, pts_to_unit_matrix(pts)) |
| , fStart(pts[0]) |
| , fEnd(pts[1]) { |
| } |
| |
| sk_sp<SkFlattenable> SkLinearGradient::CreateProc(SkReadBuffer& buffer) { |
| DescriptorScope desc; |
| if (!desc.unflatten(buffer)) { |
| return nullptr; |
| } |
| SkPoint pts[2]; |
| pts[0] = buffer.readPoint(); |
| pts[1] = buffer.readPoint(); |
| return SkGradientShader::MakeLinear(pts, desc.fColors, std::move(desc.fColorSpace), desc.fPos, |
| desc.fCount, desc.fTileMode, desc.fGradFlags, |
| desc.fLocalMatrix); |
| } |
| |
| void SkLinearGradient::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writePoint(fStart); |
| buffer.writePoint(fEnd); |
| } |
| |
| #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT |
| SkShaderBase::Context* SkLinearGradient::onMakeContext( |
| const ContextRec& rec, SkArenaAlloc* alloc) const |
| { |
| // make sure our colorspaces are compatible with legacy blits |
| if (!rec.isLegacyCompatible(fColorSpace.get())) { |
| return nullptr; |
| } |
| // Can't use legacy blit if we can't represent our colors as SkColors |
| if (!this->colorsCanConvertToSkColor()) { |
| return nullptr; |
| } |
| |
| return fTileMode != SkTileMode::kDecal |
| ? CheckedMakeContext<LinearGradient4fContext>(alloc, *this, rec) |
| : nullptr; |
| } |
| |
| SkShaderBase::Context* SkLinearGradient::onMakeBurstPipelineContext( |
| const ContextRec& rec, SkArenaAlloc* alloc) const { |
| |
| if (fTileMode == SkTileMode::kDecal) { |
| // we only support decal w/ stages |
| return nullptr; |
| } |
| // Raster pipeline has a 2-stop specialization faster than our burst. |
| return fColorCount > 2 ? CheckedMakeContext<LinearGradient4fContext>(alloc, *this, rec) |
| : nullptr; |
| } |
| #endif |
| |
| void SkLinearGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline*, |
| SkRasterPipeline*) const { |
| // No extra stage needed for linear gradients. |
| } |
| |
| SkShader::GradientType SkLinearGradient::asAGradient(GradientInfo* info) const { |
| if (info) { |
| commonAsAGradient(info); |
| info->fPoint[0] = fStart; |
| info->fPoint[1] = fEnd; |
| } |
| return kLinear_GradientType; |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "gradients/GrGradientShader.h" |
| |
| std::unique_ptr<GrFragmentProcessor> SkLinearGradient::asFragmentProcessor( |
| const GrFPArgs& args) const { |
| return GrGradientShader::MakeLinear(*this, args); |
| } |
| |
| #endif |