387 lines
No EOL
18 KiB
C++
387 lines
No EOL
18 KiB
C++
/*
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Crafter®.Graphics
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Copyright (C) 2025 Catcrafts®
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catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 3.0 as published by the Free Software Foundation;
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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module;
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#define STB_IMAGE_IMPLEMENTATION
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#include "../lib/stb_image.h"
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export module Crafter.Graphics:RenderingElement;
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import std;
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import :Transform;
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import :Types;
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import :Window;
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export namespace Crafter {
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enum class OpaqueType {
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FullyOpaque, // All pixels have A of 255
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SemiOpaque, // All pixels have A of 0 or 255 (no blending needed)
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Transparent // Color blending is used
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};
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struct RenderElementScalingOwning {
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std::vector<Pixel_BU8_GU8_RU8_AU8> scalingBuffer;
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std::uint_fast32_t bufferWidth;
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std::uint_fast32_t bufferHeight;
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bool bufferUpdated = true;
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RenderElementScalingOwning() = default;
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RenderElementScalingOwning(std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight) : scalingBuffer(bufferWidth*bufferHeight), bufferWidth(bufferWidth), bufferHeight(bufferHeight) {
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}
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};
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struct RenderElementScalingNonOwning {
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Pixel_BU8_GU8_RU8_AU8* scalingBuffer;
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std::uint_fast32_t bufferWidth;
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std::uint_fast32_t bufferHeight;
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bool bufferUpdated = true;
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RenderElementScalingNonOwning() = default;
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RenderElementScalingNonOwning(Pixel_BU8_GU8_RU8_AU8* scalingBuffer, std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight) : scalingBuffer(scalingBuffer), bufferWidth(bufferWidth), bufferHeight(bufferHeight) {
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}
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};
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struct RenderElementRotating {
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std::uint_fast32_t rotation;
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bool rotationUpdated = true;
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RenderElementRotating() = default;
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RenderElementRotating(std::uint_fast32_t rotation) : rotation(rotation) {
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}
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};
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struct EmptyScalingBase {};
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struct EmptyRotatingBase {};
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template<bool Scaling, bool Owning>
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using ScalingBase =
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std::conditional_t<
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Scaling,
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std::conditional_t<Owning,
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RenderElementScalingOwning,
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RenderElementScalingNonOwning>,
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EmptyScalingBase
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>;
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template<bool Rotating>
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using RotatingBase =
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std::conditional_t<
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Rotating,
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RenderElementRotating,
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EmptyRotatingBase
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>;
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class RenderingElementBase : public Transform {
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public:
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std::vector<Pixel_BU8_GU8_RU8_AU8> buffer;
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OpaqueType opaque;
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RenderingElementBase(Anchor anchor, OpaqueType opaque) : Transform(anchor), opaque(opaque) {
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scaled.width = 0;
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}
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};
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template<bool Scaling, bool Owning, bool Rotating> requires ((!Rotating || Scaling) && (!Owning || Scaling))
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class RenderingElement : public RenderingElementBase, public ScalingBase<Scaling, Owning>, public RotatingBase<Rotating> {
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public:
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RenderingElement() = default;
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RenderingElement(Anchor anchor, OpaqueType opaque) : RenderingElementBase(anchor, opaque) {
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}
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RenderingElement(Anchor anchor, OpaqueType opaque, std::uint_fast32_t rotation) requires(Rotating) : RenderingElementBase(anchor, opaque), RotatingBase<Rotating>(rotation) {
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}
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RenderingElement(Anchor anchor, const std::string_view imagePath) : Transform(anchor) {
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LoadImage(imagePath);
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}
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RenderingElement(Anchor anchor, const std::string_view imagePath, std::uint_fast32_t rotation) requires(Rotating) : Transform(anchor), RotatingBase<Rotating>(rotation) {
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LoadImage(imagePath);
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}
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RenderingElement(Anchor anchor, const std::string_view imagePath, OpaqueType opaque) : RenderingElementBase(anchor, opaque) {
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LoadImageNoOpaqueCheck(imagePath);
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}
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RenderingElement(Anchor anchor, const std::string_view imagePath, OpaqueType opaque, std::uint_fast32_t rotation) requires(Rotating) : RenderingElementBase(anchor, opaque), RotatingBase<Rotating>(rotation) {
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LoadImageNoOpaqueCheck(imagePath);
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}
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RenderingElement(Anchor anchor, OpaqueType opaque, std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight, Pixel_BU8_GU8_RU8_AU8* scalingBuffer) requires(Scaling && !Owning) : RenderingElementBase(anchor, opaque), ScalingBase<Scaling, Owning>(bufferWidth, bufferHeight, scalingBuffer) {
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}
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RenderingElement(Anchor anchor, OpaqueType opaque, std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight, Pixel_BU8_GU8_RU8_AU8* scalingBuffer, std::uint_fast32_t rotation) requires(Scaling && !Owning && Rotating) : RenderingElementBase(anchor, opaque), ScalingBase<Scaling, Owning>(bufferWidth, bufferHeight, scalingBuffer), RotatingBase<Rotating>(rotation) {
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}
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RenderingElement(Anchor anchor, OpaqueType opaque, std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight) requires(Owning) : RenderingElementBase(anchor, opaque), ScalingBase<Scaling, Owning>(bufferWidth, bufferHeight) {
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}
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RenderingElement(Anchor anchor, OpaqueType opaque, std::uint_fast32_t bufferWidth, std::uint_fast32_t bufferHeight, std::uint_fast32_t rotation) requires(Owning && Rotating) : RenderingElementBase(anchor, opaque), ScalingBase<Scaling, Owning>(bufferWidth, bufferHeight) , RotatingBase<Rotating>(rotation) {
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}
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RenderingElement(RenderingElement&) = delete;
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RenderingElement& operator=(RenderingElement&) = delete;
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void ScaleNearestNeighbor() requires(Scaling) {
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for (std::uint_fast32_t y = 0; y < scaled.height; y++) {
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std::uint_fast32_t srcY = y * ScalingBase<true, Owning>::bufferHeight / scaled.height;
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for (std::uint_fast32_t x = 0; x < scaled.width; x++) {
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std::uint_fast32_t srcX = x * ScalingBase<true, Owning>::bufferWidth / scaled.width;
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buffer[y * scaled.width + x] = ScalingBase<true, Owning>::scalingBuffer[srcY * ScalingBase<true, Owning>::bufferWidth + srcX];
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}
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}
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}
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void ScaleRotating() requires(Scaling) {
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const double rad = (static_cast<double>(RotatingBase<true>::rotation) / static_cast<double>(std::numeric_limits<std::uint_fast32_t>::max())) * 2.0 * std::numbers::pi;
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const std::uint_fast32_t dstWidth = scaled.width;
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const std::uint_fast32_t dstHeight = scaled.height;
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const double c2 = std::abs(std::cos(rad));
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const double s2 = std::abs(std::sin(rad));
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const double rotatedWidth = dstWidth * c2 + dstHeight * s2;
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const double rotatedHeight = dstWidth * s2 + dstHeight * c2;
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const std::uint_fast32_t diffX = static_cast<std::uint_fast32_t>(std::ceil((rotatedWidth - dstWidth) * 0.5));
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const std::uint_fast32_t diffY = static_cast<std::uint_fast32_t>(std::ceil((rotatedHeight - dstHeight) * 0.5));
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scaled.width += diffX + diffX;
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scaled.height += diffY + diffY;
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scaled.x -= diffX;
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scaled.y -= diffY;
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ScalingBase<true, Owning>::scalingBuffer.clear();
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ScalingBase<true, Owning>::scalingBuffer.resize(scaled.width * scaled.height);
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// Destination center
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const double dstCx = (static_cast<double>(scaled.width) - 1.0) * 0.5;
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const double dstCy = (static_cast<double>(scaled.height) - 1.0) * 0.5;
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// Source center
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const double srcCx = (static_cast<double>(ScalingBase<true, Owning>::bufferWidth) - 1.0) * 0.5;
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const double srcCy = (static_cast<double>(ScalingBase<true, Owning>::bufferHeight) - 1.0) * 0.5;
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const double c = std::cos(rad);
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const double s = std::sin(rad);
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// Scale factors (destination → source)
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const double scaleX = static_cast<double>(ScalingBase<true, Owning>::bufferWidth) / dstWidth;
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const double scaleY = static_cast<double>(ScalingBase<true, Owning>::bufferHeight) / dstHeight;
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for (std::uint_fast32_t yB = 0; yB < scaled.height; ++yB) {
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for (std::uint_fast32_t xB = 0; xB < scaled.width; ++xB) {
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// ---- Destination pixel relative to center ----
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const double dx = (static_cast<double>(xB) - dstCx) * scaleX;
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const double dy = (static_cast<double>(yB) - dstCy) * scaleY;
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// ---- Inverse rotation ----
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const double sx = (c * dx - s * dy) + srcCx;
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const double sy = (s * dx + c * dy) + srcCy;
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// ---- Nearest neighbour sampling ----
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const std::int_fast32_t srcX = static_cast<std::int_fast32_t>(std::round(sx));
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const std::int_fast32_t srcY = static_cast<std::int_fast32_t>(std::round(sy));
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if (srcX >= 0 && srcX < ScalingBase<true, Owning>::bufferWidth && srcY >= 0 && srcY < ScalingBase<true, Owning>::bufferHeight) {
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buffer[yB * scaled.width + xB] = ScalingBase<true, Owning>::scalingBuffer[srcY * ScalingBase<true, Owning>::bufferWidth + srcX];
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}
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}
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}
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}
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void UpdatePosition(Window& window, ScaleData oldScale) {
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if constexpr(Scaling && !Rotating) {
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if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
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buffer.resize(scaled.width * scaled.height);
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ScaleNearestNeighbor();
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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} else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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if(ScalingBase<true, Owning>::bufferUpdated) {
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ScaleNearestNeighbor();
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ScalingBase<true, Owning>::bufferUpdated = false;
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}
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} else if(ScalingBase<true, Owning>::bufferUpdated) {
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ScaleNearestNeighbor();
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ScalingBase<true, Owning>::bufferUpdated = false;
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}
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} else if constexpr(Rotating) {
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if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
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buffer.resize(scaled.width * scaled.height);
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ScaleNearestNeighbor();
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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} else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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if(ScalingBase<true, Owning>::bufferUpdated) {
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ScaleRotating();
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ScalingBase<true, Owning>::bufferUpdated = false;
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RotatingBase<true>::rotationUpdated = false;
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}
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} else if(ScalingBase<true, Owning>::bufferUpdated || RotatingBase<true>::rotationUpdated) {
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ScaleRotating();
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ScalingBase<true, Owning>::bufferUpdated = false;
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RotatingBase<true>::rotationUpdated = false;
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}
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} else {
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if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
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buffer.resize(scaled.width * scaled.height);
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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}
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if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
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window.AddDirtyRect(oldScale);
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window.AddDirtyRect(scaled);
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}
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}
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}
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void UpdatePosition(Window& window) override {
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ScaleData oldScale = scaled;
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window.ScaleElement(*this);
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UpdatePosition(window, oldScale);
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for(Transform* child : children) {
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child->UpdatePosition(window, *this);
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}
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}
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void UpdatePosition(Window& window, Transform& parent) override {
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ScaleData oldScale = scaled;
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window.ScaleElement(*this, parent);
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UpdatePosition(window, oldScale);
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for(Transform* child : children) {
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child->UpdatePosition(window, *this);
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}
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}
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void LoadImage(const std::string_view imagePath) {
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std::filesystem::path abs = std::filesystem::absolute(imagePath);
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int xSize;
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int ySize;
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unsigned char* bgData = stbi_load(abs.string().c_str(), &xSize, &ySize, nullptr, 4);
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if constexpr(Scaling && !Owning) {
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ScalingBase<true, false>::bufferUpdated = true;
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} else if constexpr(Scaling && Owning) {
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ScalingBase<true, true>::bufferWidth = xSize;
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ScalingBase<true, true>::bufferHeight = ySize;
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ScalingBase<true, true>::bufferUpdated = true;
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} else {
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buffer.resize(xSize*ySize);
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}
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opaque = OpaqueType::FullyOpaque;
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if constexpr(Scaling) {
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for(std::uint_fast32_t x = 0; x < xSize; x++) {
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for(std::uint_fast32_t y = 0; y < ySize; y++) {
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std::uint_fast32_t idx = (x*ySize+y)*4;
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].r = bgData[idx];
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].g = bgData[idx+1];
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].b = bgData[idx+2];
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ScalingBase<true, Owning>::calingBuffer[x*ySize+y].a = bgData[idx+3];
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}
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}
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for(std::uint_fast32_t i = 0; i < xSize*ySize; i++) {
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if(ScalingBase<true, Owning>::scalingBuffer[i].a != 255) {
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opaque = OpaqueType::SemiOpaque;
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for(std::uint_fast32_t i2 = 0; i2 < xSize*ySize; i2++) {
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if(ScalingBase<true, Owning>::scalingBuffer[i2].a != 0 && ScalingBase<true, Owning>::scalingBuffer[i2].a != 255) {
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opaque = OpaqueType::Transparent;
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return;
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}
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}
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return;
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}
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}
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} else {
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for(std::uint_fast32_t x = 0; x < xSize; x++) {
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for(std::uint_fast32_t y = 0; y < ySize; y++) {
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std::uint_fast32_t idx = (x*ySize+y)*4;
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buffer[x*ySize+y].r = bgData[idx];
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buffer[x*ySize+y].g = bgData[idx+1];
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buffer[x*ySize+y].b = bgData[idx+2];
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buffer[x*ySize+y].a = bgData[idx+3];
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}
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}
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for(std::uint_fast32_t i = 0; i < xSize*ySize; i++) {
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if(buffer[i].a != 255) {
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opaque = OpaqueType::SemiOpaque;
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for(std::uint_fast32_t i2 = 0; i2 < xSize*ySize; i2++) {
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if(buffer[i2].a != 0 && buffer[i2].a != 255) {
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opaque = OpaqueType::Transparent;
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return;
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}
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}
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return;
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}
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}
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}
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}
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void LoadImageNoOpaqueCheck(const std::string_view imagePath) {
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std::filesystem::path abs = std::filesystem::absolute(imagePath);
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int xSize;
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int ySize;
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unsigned char* bgData = stbi_load(abs.string().c_str(), &xSize, &ySize, nullptr, 4);
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if constexpr(Scaling && !Owning) {
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ScalingBase<true, false>::bufferUpdated = true;
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} else if constexpr(Scaling && Owning) {
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ScalingBase<true, true>::bufferWidth = xSize;
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ScalingBase<true, true>::bufferHeight = ySize;
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ScalingBase<true, true>::bufferUpdated = true;
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} else {
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buffer.resize(xSize*ySize);
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}
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if constexpr(Scaling) {
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for(std::uint_fast32_t x = 0; x < xSize; x++) {
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for(std::uint_fast32_t y = 0; y < ySize; y++) {
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std::uint_fast32_t idx = (x*ySize+y)*4;
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].r = bgData[idx];
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].g = bgData[idx+1];
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].b = bgData[idx+2];
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ScalingBase<true, Owning>::scalingBuffer[x*ySize+y].a = bgData[idx+3];
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}
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}
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} else {
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for(std::uint_fast32_t x = 0; x < xSize; x++) {
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for(std::uint_fast32_t y = 0; y < ySize; y++) {
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std::uint_fast32_t idx = (x*ySize+y)*4;
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buffer[x*ySize+y].r = bgData[idx];
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buffer[x*ySize+y].g = bgData[idx+1];
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buffer[x*ySize+y].b = bgData[idx+2];
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buffer[x*ySize+y].a = bgData[idx+3];
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}
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}
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}
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}
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};
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} |