71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
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#include "PixelariumImageView.hpp"
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#include <format>
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#include "imgui.h"
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/// @brief Checks if the dimensions of two ImVec2 vectors have changed significantly.
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/// @param ref_rect The reference ImVec2 vector.
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/// @param new_rect The new ImVec2 vector to compare against.
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/// @return True if the absolute difference between the y-coordinates is greater than 5 or the x-coordinates are
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/// different; otherwise, false.
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static bool dim_changed_p(const ImVec2& ref_rect, const ImVec2& new_rect)
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{
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if (std::abs(ref_rect.y - new_rect.y) > 5 || std::abs(ref_rect.x - new_rect.x))
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{
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return true;
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}
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return false;
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}
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/// @brief Calculates dimensions to maintain aspect ratio.
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/// @param img The input image.
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/// @param curr_dim The current dimensions.
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/// @return The calculated dimensions maintaining aspect ratio.
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ImVec2 aspect_const_dimensions(const pixelarium::imaging::PixelariumImage& img, const ImVec2& curr_dim)
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{
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const auto w_fact = (static_cast<float>(curr_dim.x) / img.GetImage().cols);
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const auto h_fact = (static_cast<float>(curr_dim.y) / img.GetImage().rows);
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const auto fact = w_fact < h_fact ? w_fact : h_fact;
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return ImVec2(img.GetImage().cols * fact, img.GetImage().rows * fact);
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}
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/// @brief Displays the image in an ImGui window.
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///
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/// If the image is null, empty, or has an empty name, the function returns immediately. Otherwise, it creates an ImGui
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/// window with a horizontal scrollbar and menu bar. The image is rendered using the CvMatRender object, resizing it to
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/// fit the available window space. The raw and rendered dimensions are displayed below the image.
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void pixelarium::render::PixelariumImageView::ShowImage()
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{
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if (this->img_ == nullptr || this->img_->Empty() || this->img_->Name().empty())
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{
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// do nothing
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return;
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}
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ImGui::Begin(img_->Name().c_str(), &this->open_p, ImGuiWindowFlags_HorizontalScrollbar | ImGuiWindowFlags_MenuBar);
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this->curr_dim_ = ImGui::GetContentRegionAvail();
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auto new_dim = ImGui::GetContentRegionAvail();
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auto texture =
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dim_changed_p(this->curr_dim_, new_dim)
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? this->render_.Render(static_cast<size_t>(this->curr_dim_.x), static_cast<size_t>(this->curr_dim_.y))
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: this->render_.Render();
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this->curr_dim_ = new_dim;
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ImVec2 dim(this->img_->GetImage().cols, this->img_->GetImage().rows);
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ImGui::Image(reinterpret_cast<ImTextureID>(reinterpret_cast<void*>(texture)),
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aspect_const_dimensions(*this->img_, new_dim));
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ImGui::Separator();
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ImGui::Text("%s", std::format(" Raw Dimensions W : {}, H: {}", dim.x, dim.y).c_str());
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ImGui::Text("%s", std::format("Render Dimensions W : {}, H: {}", curr_dim_.x, curr_dim_.y).c_str());
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ImGui::End();
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}
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