Kueffner, Maximilian
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
#include "CvMatRender.hpp"
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#include <gl/GL.h>
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#include <cstdint>
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#include <memory>
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#include <opencv2/core/mat.hpp>
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#include <tuple>
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#include <utility>
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#include "imaging/Image.hpp"
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#include <opencv2/imgproc.hpp>
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using namespace pixelarium::imaging;
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pixelarium::render::CvMatRender::CvMatRender(const std::shared_ptr<Image>& img)
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: _base(img), _texture(0)
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{
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// this->_img = this->_base->GetImage().clone();
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// // storing a copy of the to-be-rendered image with a "well-behaved"
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// cv::cvtColor(this->_img, this->_img, cv::COLOR_BGR2RGBA);
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this->_img = this->_base->GetImage().clone();
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}
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/*static*/ void pixelarium::render::matToTexture(const cv::Mat& image,
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GLuint* texture)
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{
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// only generate the texture when it's not already present
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if (*texture == 0)
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{
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glGenTextures(1, texture);
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}
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glBindTexture(GL_TEXTURE_2D, *texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// auto image = img.GetImage();
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switch (image.type())
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{
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case CV_16U:
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case CV_16UC3:
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case 26:
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.cols, image.rows, 0,
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GL_RGBA, GL_UNSIGNED_SHORT, image.data);
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break;
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case 5:
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case 29:
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.cols, image.rows, 0,
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GL_RGBA, GL_FLOAT, image.data);
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break;
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default:
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glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.cols, image.rows, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image.data);
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break;
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}
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}
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GLuint* pixelarium::render::CvMatRender::Render()
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{
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// storing a copy of the to-be-rendered image with a "well-behaved"
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cv::cvtColor(this->_img, this->_img, cv::COLOR_BGR2RGBA);
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matToTexture(this->_img, &this->_texture);
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return &this->_texture;
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}
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GLuint* pixelarium::render::CvMatRender::Render(float factor)
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{
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cv::resize(this->_base->GetImage(), this->_img, cv::Size(0,0), factor, factor, cv::INTER_LINEAR_EXACT);
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return this->Render();
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}
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GLuint* pixelarium::render::CvMatRender::Render(size_t width, size_t height)
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{
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// this is nasty as it knows about what Render is doing
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const auto sz{this->_base->GetImage().size()};
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const auto get_factor = [](auto opt1, auto opt2) -> float
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{
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return opt1 < opt2 ? opt1 : opt2;
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};
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auto factor = get_factor(width / static_cast<float>(sz.width), height / static_cast<float>(sz.height));
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// cv::resize(this->_base->GetImage(), this->_img, cv::Size(0,0), factor, factor, cv::INTER_LINEAR_EXACT);
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return this->Render(factor);
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}
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