Add thumbnails

imagescrollareagl.h

@@ -4,13 +4,14 @@
 #include <memory>
 #include <QObject>
 #include <QOpenGLWidget>
-#include <QOpenGLFunctions_3_2_Core>
+#include <QOpenGLFunctions_3_3_Core>
 #include <QOpenGLShaderProgram>
 #include <QOpenGLBuffer>
 #include <QOpenGLTexture>
 #include <QOpenGLVertexArrayObject>
 #include <QScrollBar>
 #include "rawimage.h"
+#include "imageringlist.h"
 
 typedef enum
 {
@@ -25,11 +26,16 @@ class ImageWidget : public QOpenGLWidget
 {
     Q_OBJECT
     QOpenGLFunctions *f;
+    QOpenGLFunctions_3_3_Core *f3;
     std::unique_ptr<QOpenGLShaderProgram> m_program;
+    std::unique_ptr<QOpenGLShaderProgram> m_thumbnailProgram;
     std::unique_ptr<QOpenGLBuffer> m_buffer;
+    std::unique_ptr<QOpenGLBuffer> m_bufferSizes;
     std::unique_ptr<QOpenGLTexture> m_image;
     std::unique_ptr<QOpenGLVertexArrayObject> m_vao;
+    std::unique_ptr<QOpenGLVertexArrayObject> m_vaoThumb;
     std::unique_ptr<QOpenGLPixelTransferOptions> m_transferOptions;
+    std::unique_ptr<QOpenGLTexture> m_thumbnailTexture;
     int m_width, m_height;
     int m_imgWidth, m_imgHeight;
     float m_low;
@@ -42,6 +48,8 @@ class ImageWidget : public QOpenGLWidget
     bool m_bwImg;
     bool m_invert;
     bool m_superpixel;
+    bool m_showThumbnails;
+    int m_thumbnailCount;
 public:
     explicit ImageWidget(QWidget *parent = nullptr);
     ~ImageWidget();
@@ -49,12 +57,15 @@ public:
     void setImage(const QPixmap &pixmap);
     void setScale(float scale);
     void blockRepaint(bool block);
+    void allocateThumbnails(int count);
 public slots:
     void setMTFParams(float low, float mid, float high);
     void setOffset(int dx, int dy);
     void superPixel(bool enable);
     void invert(bool enable);
     QImage renderToImage();
+    void thumbnailLoaded(const Image *image);
+    void showThumbnail(bool enable);
 protected:
     void paintGL();
     void resizeGL(int w, int h);
@@ -75,12 +86,14 @@ class ImageScrollAreaGL : public QWidget
     QPoint m_lastPos;
     float m_scale;
     bool m_bestFit;
+    int m_thumbCount;
 public:
     explicit ImageScrollAreaGL(QWidget *parent = nullptr);
     ~ImageScrollAreaGL();
     void setImage(RawImage *image);
     void setImage(const QPixmap &pixmap);
     ImageWidget* imageWidget();
+    void setThumbnails(int count);
 protected:
     void updateScrollbars(bool zoom = false);
     void resizeEvent(QResizeEvent *event);