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 #define USE_SHADING !(USE_GPU_RENDERING) && true
  12
  13 #ifdef QUADTREE_DISABLED
  14
  15 //#define TRANSFORM_OBJECTS_NOT_VIEW
  16
  17 #endif
  18
  19 namespace IPDF
  20 {
  21         class Screen;
  22         /**
  23          * The View class manages a rectangular view into the document.
  24          * It is responsible for coordinate transforms and rendering the document.
  25          * ObjectRenderer's for each type of Object should be created in the constructor.
  26          */
  27         class View
  28         {
  29                 public:
  30                         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));
  31                         virtual ~View();
  32
  33                         void Render(int width = 0, int height = 0);
  34
  35                         void Translate(Real x, Real y);
  36                         void ScaleAroundPoint(Real x, Real y, Real scale_amount);
  37                         void SetBounds(const Rect & new_bounds);
  38
  39                         Rect TransformToViewCoords(const Rect& inp) const;
  40
  41                         const Rect& GetBounds() const { return m_bounds; }
  42
  43
  44                         const bool UsingGPUTransform() const { return m_use_gpu_transform; } // whether view transform calculated on CPU or GPU
  45                         const bool UsingGPURendering() const { return m_use_gpu_rendering; } // whether GPU shaders are used or CPU rendering
  46                         void ToggleGPUTransform() { m_use_gpu_transform = (!m_use_gpu_transform); m_bounds_dirty = true; m_buffer_dirty = true; }
  47                         void ToggleGPURendering() { m_use_gpu_rendering = (!m_use_gpu_rendering); m_bounds_dirty = true; m_buffer_dirty = true; }
  48                         void SetGPUTransform(bool state) {m_use_gpu_transform = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  49
  50                         void SetGPURendering(bool state) {m_use_gpu_rendering = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  51
  52                         bool ShowingBezierBounds() const {return m_show_bezier_bounds;} // render bounds rectangles
  53                         void ShowBezierBounds(bool state) {m_show_bezier_bounds = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  54                         bool ShowingBezierType() const {return m_show_bezier_type;}
  55                         void ShowBezierType(bool state) {m_show_bezier_type = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  56                         bool ShowingFillPoints() const {return m_show_fill_points;}
  57                         void ShowFillPoints(bool state) {m_show_fill_points = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  58                         bool ShowingFillBounds() const {return m_show_fill_bounds;}
  59                         void ShowFillBounds(bool state) {m_show_fill_bounds = true;}
  60
  61                         bool PerformingShading() const {return m_perform_shading;}
  62                         void PerformShading(bool state) {m_perform_shading = state; m_bounds_dirty = true; m_buffer_dirty = true;}
  63
  64                         void ForceBoundsDirty() {m_bounds_dirty = true;}
  65                         void ForceBufferDirty() {m_buffer_dirty = true;}
  66                         void ForceRenderDirty() {m_render_dirty = true;}
  67
  68                         void SetLazyRendering(bool state = true) {m_lazy_rendering = state;}
  69                         bool UsingLazyRendering() const {return m_lazy_rendering;}
  70
  71                         void SaveBMP(const char * filename) {if (UsingGPURendering()) SaveGPUBMP(filename); else SaveCPUBMP(filename);}
  72
  73                         void SaveCPUBMP(const char * filename);
  74                         void SaveGPUBMP(const char * filename);
  75
  76                         Document & Doc() {return m_document;}
  77
  78                 private:
  79                         struct GPUObjBounds
  80                         {
  81                                 float x0, y0;
  82                                 float x1, y1;
  83                         } __attribute__((packed));
  84
  85                         void PrepareRender(); // call when m_render_dirty is true
  86                         void UpdateObjBoundsVBO(unsigned first_obj, unsigned last_obj); // call when m_buffer_dirty is true
  87
  88                         void RenderRange(int width, int height, unsigned first_obj, unsigned last_obj);
  89
  90                         bool m_use_gpu_transform;
  91                         bool m_use_gpu_rendering;
  92                         bool m_bounds_dirty; // the view bounds has changed (occurs when changing view)
  93                         bool m_buffer_dirty; // the object bounds have changed (also occurs when changing view, but only when not using GPU transforms)
  94                         bool m_render_dirty; // the document has changed (occurs when document first loaded)
  95                         Document & m_document;
  96                         Screen & m_screen;
  97                         FrameBuffer m_cached_display;
  98                         Rect m_bounds;
  99                         Colour m_colour;
 100
 101                         // Stores the view bounds.
 102                         GraphicsBuffer m_bounds_ubo; //bounds_dirty means this one has changed
 103                         // Stores the bounds for _all_ objects.
 104                         GraphicsBuffer m_objbounds_vbo; //buffer_dirty means this one has changed
 105
 106                         // ObjectRenderers to be initialised in constructor
 107                         // Trust me it will be easier to generalise things this way. Even though there are pointers.
 108                         std::vector<ObjectRenderer*> m_object_renderers;
 109                         uint8_t * m_cpu_rendering_pixels; // pixels to be used for CPU rendering
 110
 111
 112                         // shading
 113                         bool m_perform_shading;
 114
 115                         // Debug rendering
 116                         bool m_show_bezier_bounds;
 117                         bool m_show_bezier_type;
 118                         bool m_show_fill_points;
 119                         bool m_show_fill_bounds;
 120
 121                         bool m_lazy_rendering;// don't redraw frames unless we need to
 122
 123
 124 #ifndef QUADTREE_DISABLED
 125                         QuadTreeIndex m_current_quadtree_node;  // The highest node we will traverse.
 126                         int m_quadtree_max_depth;               // The maximum quadtree depth.
 127                         void RenderQuadtreeNode(int width, int height, QuadTreeIndex node, int remaining_depth);
 128
 129 #endif
 130         };
 131 }
 132
 133 #endif //_VIEW_H