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Add transform_pixels_expr function. Add ExprTraitsBase class.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,75 @@ | ||
| // This file is part of the `Selene` library. | ||
| // Copyright 2017-2019 Michael Hofmann (https://github.com/kmhofmann). | ||
| // Distributed under MIT license. See accompanying LICENSE file in the top-level directory. | ||
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| #ifndef SELENE_IMG_IMPL_IMAGE_CONVERSION_ALPHA_EXPR_HPP | ||
| #define SELENE_IMG_IMPL_IMAGE_CONVERSION_ALPHA_EXPR_HPP | ||
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| /// @file | ||
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| #include <selene/img/pixel/PixelTraits.hpp> | ||
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| #include <selene/img/typed/Image.hpp> | ||
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| #include <selene/img_ops/PixelConversions.hpp> | ||
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| namespace sln::impl { | ||
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| template <PixelFormat pixel_format_src, | ||
| PixelFormat pixel_format_dst, | ||
| typename PixelTypeSrc, | ||
| typename PixelTypeDst, | ||
| typename ElementType, | ||
| typename Expr> class ImageConversionAlphaExpr; | ||
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| template <PixelFormat pixel_format_src, | ||
| PixelFormat pixel_format_dst, | ||
| typename PixelTypeSrc, | ||
| typename PixelTypeDst, | ||
| typename ElementType, | ||
| typename Expr> | ||
| struct ImageExprTraits<ImageConversionAlphaExpr<pixel_format_src, pixel_format_dst, PixelTypeSrc, PixelTypeDst, ElementType, Expr>> | ||
| : public ExprTraitsBase | ||
| { | ||
| using PixelType = PixelTypeDst; | ||
| }; | ||
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| template <PixelFormat pixel_format_src, | ||
| PixelFormat pixel_format_dst, | ||
| typename PixelTypeSrc, | ||
| typename PixelTypeDst, | ||
| typename ElementType, | ||
| typename Expr> | ||
| class ImageConversionAlphaExpr | ||
| : public ImageExpr<ImageConversionAlphaExpr<pixel_format_src, pixel_format_dst, PixelTypeSrc, PixelTypeDst, ElementType, Expr>> | ||
| { | ||
| public: | ||
| using PixelType = typename ImageExprTraits<ImageConversionAlphaExpr<pixel_format_src, pixel_format_dst, PixelTypeSrc, PixelTypeDst, ElementType, Expr>>::PixelType; | ||
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| explicit ImageConversionAlphaExpr(const Expr& e, ElementType alpha) : e_(e), alpha_(alpha) {} | ||
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| const TypedLayout& layout() const noexcept { return e_.layout(); } | ||
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| PixelLength width() const noexcept { return e_.width(); } | ||
| PixelLength height() const noexcept { return e_.height(); } | ||
| Stride stride_bytes() const noexcept { return e_.stride_bytes(); } | ||
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| decltype(auto) operator()(PixelIndex x, PixelIndex y) const noexcept | ||
| { | ||
| return PixelConversion<pixel_format_src, pixel_format_dst>::apply(e_(x, y), alpha_); | ||
| } | ||
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| template <typename Allocator = default_bytes_allocator> | ||
| decltype(auto) eval() const noexcept | ||
| { | ||
| return Image<PixelType, Allocator>(*this); | ||
| } | ||
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| private: | ||
| const Expr& e_; | ||
| ElementType alpha_; | ||
| }; | ||
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| } // namespace sln::impl | ||
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| #endif // SELENE_IMG_IMPL_IMAGE_CONVERSION_ALPHA_EXPR_HPP |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| // This file is part of the `Selene` library. | ||
| // Copyright 2017-2019 Michael Hofmann (https://github.com/kmhofmann). | ||
| // Distributed under MIT license. See accompanying LICENSE file in the top-level directory. | ||
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| #ifndef SELENE_IMG_IMPL_TRANSFORM_EXPR_HPP | ||
| #define SELENE_IMG_IMPL_TRANSFORM_EXPR_HPP | ||
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| /// @file | ||
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| #include <selene/img/pixel/PixelTraits.hpp> | ||
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| #include <selene/img/typed/Image.hpp> | ||
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| namespace sln::impl { | ||
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| template <typename Expr, typename UnaryFunction> class TransformExpr; | ||
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| template <typename Expr, typename UnaryFunction> | ||
| struct ImageExprTraits<TransformExpr<Expr, UnaryFunction>> | ||
| : public ExprTraitsBase | ||
| { | ||
| using PixelType = decltype(std::declval<UnaryFunction>().operator()(typename Expr::PixelType{})); | ||
| }; | ||
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| template <typename Expr, typename UnaryFunction> | ||
| class TransformExpr : public ImageExpr<TransformExpr<Expr, UnaryFunction>> | ||
| { | ||
| public: | ||
| using PixelType = typename ImageExprTraits<TransformExpr<Expr, UnaryFunction>>::PixelType; | ||
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| explicit TransformExpr(const Expr& e, const UnaryFunction& func) : e_(e), func_(func) {} | ||
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| const TypedLayout& layout() const noexcept { return e_.layout(); } | ||
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| PixelLength width() const noexcept { return e_.width(); } | ||
| PixelLength height() const noexcept { return e_.height(); } | ||
| Stride stride_bytes() const noexcept { return e_.stride_bytes(); } | ||
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| decltype(auto) operator()(PixelIndex x, PixelIndex y) const noexcept | ||
| { | ||
| return func_(e_(x, y)); | ||
| } | ||
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| template <typename Allocator = default_bytes_allocator> | ||
| decltype(auto) eval() const noexcept | ||
| { | ||
| return Image<PixelType, Allocator>(*this); | ||
| } | ||
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| private: | ||
| const Expr& e_; | ||
| const UnaryFunction& func_; | ||
| }; | ||
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| } // namespace sln::impl | ||
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| #endif // SELENE_IMG_IMPL_TRANSFORM_EXPR_HPP |
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