src/view.h

   1 #ifndef _VIEW_H
   2 #define _VIEW_H
   3
   4 #include "ipdf.h"
   5 #include "document.h"
   6 #include "framebuffer.h"
   7 #include "objectrenderer.h"
   8
   9 #define USE_GPU_TRANSFORM true
  10 #define USE_GPU_RENDERING true
  11
  12 namespace IPDF
  13 {
  14         class Screen;
  15         /**
  16          * The View class manages a rectangular view into the document.
  17          * It is responsible for coordinate transforms and rendering the document.
  18          * ObjectRenderer's for each type of Object should be created in the constructor.
  19          */
  20         class View
  21         {
  22                 public:
  23                         View(Document & document, Screen & screen, const Rect & bounds = Rect(0,0,1,1), const Colour & colour = Colour(0.f,0.f,0.f,1.f));
  24                         virtual ~View();
  25
  26                         void Render(int width = 0, int height = 0);
  27
  28                         void Translate(Real x, Real y);
  29                         void ScaleAroundPoint(Real x, Real y, Real scale_amount);
  30
  31                         Rect TransformToViewCoords(const Rect& inp) const;
  32
  33                         const Rect& GetBounds() const { return m_bounds; }
  34
  35                         const bool UsingGPUTransform() const { return m_use_gpu_transform; } // whether view transform calculated on CPU or GPU
  36                         const bool UsingGPURendering() const { return m_use_gpu_rendering; } // whether GPU shaders are used or CPU rendering
  37                         void ToggleGPUTransform() { m_use_gpu_transform = (!m_use_gpu_transform); m_bounds_dirty = true; m_buffer_dirty = true; }
  38                         void ToggleGPURendering() { m_use_gpu_rendering = (!m_use_gpu_rendering); m_bounds_dirty = true; m_buffer_dirty = true; }
  39
  40                         void SetGPURendering(bool state) {m_use_gpu_rendering = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  41
  42
  43                         void ForceBoundsDirty() {m_bounds_dirty = true;}
  44                         void ForceBufferDirty() {m_buffer_dirty = true;}
  45                         void ForceRenderDirty() {m_render_dirty = true;}
  46
  47                 private:
  48                         struct GPUObjBounds
  49                         {
  50                                 float x0, y0;
  51                                 float x1, y1;
  52                         } __attribute__((packed));
  53
  54                         void PrepareRender(); // call when m_render_dirty is true
  55                         void UpdateObjBoundsVBO(unsigned first_obj, unsigned last_obj); // call when m_buffer_dirty is true
  56
  57                         void RenderRange(int width, int height, unsigned first_obj, unsigned last_obj);
  58
  59                         bool m_use_gpu_transform;
  60                         bool m_use_gpu_rendering;
  61                         bool m_bounds_dirty; // the view bounds has changed (occurs when changing view)
  62                         bool m_buffer_dirty; // the object bounds have changed (also occurs when changing view, but only when not using GPU transforms)
  63                         bool m_render_dirty; // the document has changed (occurs when document first loaded)
  64                         Document & m_document;
  65                         Screen & m_screen;
  66                         FrameBuffer m_cached_display;
  67                         Rect m_bounds;
  68                         Colour m_colour;
  69
  70                         // Stores the view bounds.
  71                         GraphicsBuffer m_bounds_ubo; //bounds_dirty means this one has changed
  72                         // Stores the bounds for _all_ objects.
  73                         GraphicsBuffer m_objbounds_vbo; //buffer_dirty means this one has changed
  74
  75                         // ObjectRenderers to be initialised in constructor
  76                         // Trust me it will be easier to generalise things this way. Even though there are pointers.
  77                         std::vector<ObjectRenderer*> m_object_renderers;
  78                         uint8_t * m_cpu_rendering_pixels; // pixels to be used for CPU rendering
  79
  80 #ifndef QUADTREE_DISABLED
  81                         QuadTreeIndex m_current_quadtree_node;  // The highest node we will traverse.
  82                         int m_quadtree_max_depth;               // The maximum quadtree depth.
  83                         void RenderQuadtreeNode(int width, int height, QuadTreeIndex node, int remaining_depth);
  84
  85 #endif
  86         };
  87 }
  88
  89 #endif //_VIEW_H