QtTextReader.h

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#ifndef OPENSHOT_QT_TEXT_READER_H
#define OPENSHOT_QT_TEXT_READER_H
 
#include "ReaderBase.h"
 
#include <atomic>
#include <list>
#include <memory>
#include <string>
#include <utility>
 
#include "Enums.h"
 
#include <QFont>
 
class QImage;
 
namespace openshot
{
    // Forward decls
    class CacheBase;
    class Frame;
 
    class QtTextReader : public ReaderBase
    {
    private:
        // Opt-in document layout keeps existing readers' drawText behavior intact.
        // These settings round-trip through JSON; sizes are pixels. Style names match
        // the Caption effect where they mean the same thing (stroke, background_padding,
        // background_corner, line_spacing). text_animation keyframes only the styles that
        // keep the image size: color, background, stroke, border, stroke_width,
        // border_width and background_corner.
        Json::Value text_animation;
        Json::Value rendered_style;
        int64_t render_frame = 1;
        double render_scale = 1.0; 
        std::atomic<double> detail_scale{1.0}; 
        double RasterScale(double& detail);
        openshot::Fraction source_fps = openshot::Fraction(30, 1); 
        std::list<std::pair<std::string, std::shared_ptr<QImage>>> render_cache;
        std::shared_ptr<QImage> Render(const Json::Value& style);
        void UseStyle(const Json::Value& style);
        void UpdateInfo();
        Json::Value EvaluateStyle(int64_t frame) const;
        bool document_layout = false;
        double background_padding = 12.0; 
        double stroke_width = 0.0; 
        std::string stroke = "#000000"; 
        double border_width = 0.0; 
        std::string border = "#ffffff"; 
        double letter_spacing = 0.0; 
        double line_spacing = 1.0; 
        double background_corner = 0.0; 
        int width;
        int height;
        int x_offset;
        int y_offset;
        std::string text;
        QFont font;
        std::string text_color;
        std::string background_color;
        std::string text_background_color;
        std::shared_ptr<QImage> image;
        bool is_open;
        openshot::GravityType gravity;
 
    public:
 
        QtTextReader();
 
        QtTextReader(int width, int height, int x_offset, int y_offset, GravityType gravity, std::string text, QFont font, std::string text_color, std::string background_color);
 
        double DetailScale() const { return detail_scale; }
 
        void SetTextBackgroundColor(std::string color);
 
        void Close() override;
 
        CacheBase* GetCache() override { return NULL; };
 
        std::shared_ptr<openshot::Frame> GetFrame(int64_t requested_frame) override;
 
        bool IsOpen() override { return is_open; };
 
        std::string Name() override { return "QtTextReader"; };
 
        // Get and Set JSON methods
        std::string Json() const override; 
        void SetJson(const std::string value) override; 
        Json::Value JsonValue() const override; 
        void SetJsonValue(const Json::Value root) override; 
 
        void Open() override;
    };
 
}
 
#endif