| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/display_list/display_list_matrix_clip_tracker.h" |
| |
| #include "flutter/display_list/display_list_builder.h" |
| #include "flutter/fml/logging.h" |
| #include "third_party/skia/include/core/SkPath.h" |
| |
| namespace flutter { |
| |
| class Data4x4 : public DisplayListMatrixClipTracker::Data { |
| public: |
| Data4x4(const SkM44& m44, const SkRect& rect) : Data(rect), m44_(m44) {} |
| explicit Data4x4(const Data* copy) |
| : Data(copy->device_cull_rect()), m44_(copy->matrix_4x4()) {} |
| |
| ~Data4x4() override = default; |
| |
| bool is_4x4() const override { return true; } |
| |
| SkMatrix matrix_3x3() const override { return m44_.asM33(); } |
| SkM44 matrix_4x4() const override { return m44_; } |
| SkRect local_cull_rect() const override; |
| |
| void translate(SkScalar tx, SkScalar ty) override { |
| m44_.preTranslate(tx, ty); |
| } |
| void scale(SkScalar sx, SkScalar sy) override { m44_.preScale(sx, sy); } |
| void skew(SkScalar skx, SkScalar sky) override { |
| m44_.preConcat(SkMatrix::Skew(skx, sky)); |
| } |
| void rotate(SkScalar degrees) override { |
| m44_.preConcat(SkMatrix::RotateDeg(degrees)); |
| } |
| void transform(const SkMatrix& matrix) override { m44_.preConcat(matrix); } |
| void transform(const SkM44& m44) override { m44_.preConcat(m44); } |
| void setTransform(const SkMatrix& matrix) override { m44_ = SkM44(matrix); } |
| void setTransform(const SkM44& m44) override { m44_ = m44; } |
| void setIdentity() override { m44_.setIdentity(); } |
| |
| protected: |
| bool has_perspective() const override; |
| bool map_rect(const SkRect& rect, SkRect* mapped) const override { |
| return m44_.asM33().mapRect(mapped, rect); |
| } |
| |
| private: |
| SkM44 m44_; |
| }; |
| |
| class Data3x3 : public DisplayListMatrixClipTracker::Data { |
| public: |
| Data3x3(const SkMatrix& matrix, const SkRect& rect) |
| : Data(rect), matrix_(matrix) {} |
| explicit Data3x3(const Data* copy) |
| : Data(copy->device_cull_rect()), matrix_(copy->matrix_3x3()) {} |
| |
| ~Data3x3() override = default; |
| |
| bool is_4x4() const override { return false; } |
| |
| SkMatrix matrix_3x3() const override { return matrix_; } |
| SkM44 matrix_4x4() const override { return SkM44(matrix_); } |
| SkRect local_cull_rect() const override; |
| |
| void translate(SkScalar tx, SkScalar ty) override { |
| matrix_.preTranslate(tx, ty); |
| } |
| void scale(SkScalar sx, SkScalar sy) override { matrix_.preScale(sx, sy); } |
| void skew(SkScalar skx, SkScalar sky) override { matrix_.preSkew(skx, sky); } |
| void rotate(SkScalar degrees) override { matrix_.preRotate(degrees); } |
| void transform(const SkMatrix& matrix) override { matrix_.preConcat(matrix); } |
| void transform(const SkM44& m44) override { |
| FML_CHECK(false) << "SkM44 was concatenated without upgrading Data"; |
| } |
| void setTransform(const SkMatrix& matrix) override { matrix_ = matrix; } |
| void setTransform(const SkM44& m44) override { |
| FML_CHECK(false) << "SkM44 was set without upgrading Data"; |
| } |
| void setIdentity() override { matrix_.setIdentity(); } |
| |
| protected: |
| bool has_perspective() const override { return matrix_.hasPerspective(); } |
| bool map_rect(const SkRect& rect, SkRect* mapped) const override { |
| return matrix_.mapRect(mapped, rect); |
| } |
| |
| private: |
| SkMatrix matrix_; |
| }; |
| |
| static bool is_3x3(const SkM44& m) { |
| // clang-format off |
| return ( m.rc(0, 2) == 0 && |
| m.rc(1, 2) == 0 && |
| m.rc(2, 0) == 0 && m.rc(2, 1) == 0 && m.rc(2, 2) == 1 && m.rc(2, 3) == 0 && |
| m.rc(3, 2) == 0); |
| // clang-format on |
| } |
| |
| DisplayListMatrixClipTracker::DisplayListMatrixClipTracker( |
| const SkRect& cull_rect, |
| const SkMatrix& matrix) { |
| saved_.emplace_back(std::make_unique<Data3x3>(matrix, cull_rect)); |
| current_ = saved_.back().get(); |
| } |
| |
| DisplayListMatrixClipTracker::DisplayListMatrixClipTracker( |
| const SkRect& cull_rect, |
| const SkM44& m44) { |
| if (is_3x3(m44)) { |
| saved_.emplace_back(std::make_unique<Data3x3>(m44.asM33(), cull_rect)); |
| } else { |
| saved_.emplace_back(std::make_unique<Data4x4>(m44, cull_rect)); |
| } |
| current_ = saved_.back().get(); |
| } |
| |
| void DisplayListMatrixClipTracker::save() { |
| if (current_->is_4x4()) { |
| saved_.emplace_back(std::make_unique<Data4x4>(current_)); |
| } else { |
| saved_.emplace_back(std::make_unique<Data3x3>(current_)); |
| } |
| current_ = saved_.back().get(); |
| } |
| |
| void DisplayListMatrixClipTracker::restore() { |
| saved_.pop_back(); |
| current_ = saved_.back().get(); |
| } |
| |
| void DisplayListMatrixClipTracker::restoreToCount(int restore_count) { |
| FML_DCHECK(restore_count <= getSaveCount()); |
| if (restore_count < 1) { |
| restore_count = 1; |
| } |
| while (restore_count < getSaveCount()) { |
| restore(); |
| } |
| } |
| |
| void DisplayListMatrixClipTracker::transform(const SkM44& m44) { |
| if (!current_->is_4x4()) { |
| if (is_3x3(m44)) { |
| current_->transform(m44.asM33()); |
| return; |
| } |
| saved_.back() = std::make_unique<Data4x4>(current_); |
| current_ = saved_.back().get(); |
| } |
| current_->transform(m44); |
| } |
| |
| void DisplayListMatrixClipTracker::setTransform(const SkM44& m44) { |
| if (!current_->is_4x4()) { |
| if (is_3x3(m44)) { |
| current_->setTransform(m44.asM33()); |
| return; |
| } |
| saved_.back() = std::make_unique<Data4x4>(current_); |
| current_ = saved_.back().get(); |
| } |
| current_->setTransform(m44); |
| } |
| |
| void DisplayListMatrixClipTracker::clipRRect(const SkRRect& rrect, |
| SkClipOp op, |
| bool is_aa) { |
| switch (op) { |
| case SkClipOp::kIntersect: |
| break; |
| case SkClipOp::kDifference: |
| if (!rrect.isRect()) { |
| return; |
| } |
| break; |
| } |
| current_->clipBounds(rrect.getBounds(), op, is_aa); |
| } |
| void DisplayListMatrixClipTracker::clipPath(const SkPath& path, |
| SkClipOp op, |
| bool is_aa) { |
| SkRect bounds; |
| switch (op) { |
| case SkClipOp::kIntersect: |
| bounds = path.getBounds(); |
| break; |
| case SkClipOp::kDifference: |
| if (!path.isRect(&bounds)) { |
| return; |
| } |
| break; |
| } |
| current_->clipBounds(bounds, op, is_aa); |
| } |
| |
| bool DisplayListMatrixClipTracker::Data::content_culled( |
| const SkRect& content_bounds) const { |
| if (cull_rect_.isEmpty() || content_bounds.isEmpty()) { |
| return true; |
| } |
| if (has_perspective()) { |
| return false; |
| } |
| SkRect mapped; |
| map_rect(content_bounds, &mapped); |
| return !mapped.intersects(cull_rect_); |
| } |
| |
| void DisplayListMatrixClipTracker::Data::clipBounds(const SkRect& clip, |
| SkClipOp op, |
| bool is_aa) { |
| if (cull_rect_.isEmpty()) { |
| // No point in intersecting further. |
| return; |
| } |
| if (has_perspective()) { |
| // We can conservatively ignore this clip. |
| return; |
| } |
| switch (op) { |
| case SkClipOp::kIntersect: { |
| if (clip.isEmpty()) { |
| cull_rect_.setEmpty(); |
| break; |
| } |
| SkRect rect; |
| map_rect(clip, &rect); |
| if (is_aa) { |
| rect.roundOut(&rect); |
| } |
| if (!cull_rect_.intersect(rect)) { |
| cull_rect_.setEmpty(); |
| } |
| break; |
| } |
| case SkClipOp::kDifference: { |
| if (clip.isEmpty() || !clip.intersects(cull_rect_)) { |
| break; |
| } |
| SkRect rect; |
| if (map_rect(clip, &rect)) { |
| // This technique only works if it is rect -> rect |
| if (is_aa) { |
| SkIRect rounded; |
| rect.round(&rounded); |
| if (rounded.isEmpty()) { |
| break; |
| } |
| rect.set(rounded); |
| } |
| if (rect.fLeft <= cull_rect_.fLeft && |
| rect.fRight >= cull_rect_.fRight) { |
| // bounds spans entire width of cull_rect_ |
| // therefore we can slice off a top or bottom |
| // edge of the cull_rect_. |
| SkScalar top = std::max(rect.fBottom, cull_rect_.fTop); |
| SkScalar btm = std::min(rect.fTop, cull_rect_.fBottom); |
| if (top < btm) { |
| cull_rect_.fTop = top; |
| cull_rect_.fBottom = btm; |
| } else { |
| cull_rect_.setEmpty(); |
| } |
| } else if (rect.fTop <= cull_rect_.fTop && |
| rect.fBottom >= cull_rect_.fBottom) { |
| // bounds spans entire height of cull_rect_ |
| // therefore we can slice off a left or right |
| // edge of the cull_rect_. |
| SkScalar lft = std::max(rect.fRight, cull_rect_.fLeft); |
| SkScalar rgt = std::min(rect.fLeft, cull_rect_.fRight); |
| if (lft < rgt) { |
| cull_rect_.fLeft = lft; |
| cull_rect_.fRight = rgt; |
| } else { |
| cull_rect_.setEmpty(); |
| } |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| SkRect Data4x4::local_cull_rect() const { |
| if (cull_rect_.isEmpty()) { |
| return cull_rect_; |
| } |
| SkMatrix inverse; |
| if (!m44_.asM33().invert(&inverse)) { |
| return SkRect::MakeEmpty(); |
| } |
| if (has_perspective()) { |
| // We could do a 4-point long-form conversion, but since this is |
| // only used for culling, let's just return a non-constricting |
| // cull rect. |
| return DisplayListBuilder::kMaxCullRect; |
| } |
| return inverse.mapRect(cull_rect_); |
| } |
| |
| bool Data4x4::has_perspective() const { |
| return (m44_.rc(3, 0) != 0 || // |
| m44_.rc(3, 1) != 0 || // |
| m44_.rc(3, 2) != 0 || // |
| m44_.rc(3, 3) != 1); |
| } |
| |
| SkRect Data3x3::local_cull_rect() const { |
| if (cull_rect_.isEmpty()) { |
| return cull_rect_; |
| } |
| SkMatrix inverse; |
| if (!matrix_.invert(&inverse)) { |
| return SkRect::MakeEmpty(); |
| } |
| if (matrix_.hasPerspective()) { |
| // We could do a 4-point long-form conversion, but since this is |
| // only used for culling, let's just return a non-constricting |
| // cull rect. |
| return DisplayListBuilder::kMaxCullRect; |
| } |
| return inverse.mapRect(cull_rect_); |
| } |
| |
| } // namespace flutter |
