osd.h

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/*
 * osd.h: Abstract On Screen Display layer
 *
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
 * $Id: osd.h 1.55 2007/06/17 13:59:22 kls Exp $
 */

#ifndef __OSD_H
#define __OSD_H

#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include "config.h"
#include "font.h"

#define MAXNUMCOLORS 256

enum {
                   //AARRGGBB
  clrTransparent = 0x00000000,
  clrGray50      = 0x7F000000, // 50% gray
  clrBlack       = 0xFF000000,
  clrRed         = 0xFFFC1414,
  clrGreen       = 0xFF24FC24,
  clrYellow      = 0xFFFCC024,
  clrMagenta     = 0xFFB000FC,
  clrBlue        = 0xFF0000FC,
  clrCyan        = 0xFF00FCFC,
  clrWhite       = 0xFFFCFCFC,
  };

enum eOsdError { oeOk,
                 oeTooManyAreas,
                 oeTooManyColors,
                 oeBppNotSupported,
                 oeAreasOverlap,
                 oeWrongAlignment,
                 oeOutOfMemory,
                 oeWrongAreaSize,
                 oeUnknown,
               };

typedef uint32_t tColor; // see also font.h
typedef uint8_t tIndex;

class cPalette {
private:
  tColor color[MAXNUMCOLORS];
  int bpp;
  int maxColors, numColors;
  bool modified;
  double antiAliasGranularity;
protected:
  typedef tIndex tIndexes[MAXNUMCOLORS];
public:
  cPalette(int Bpp = 8);
  void SetAntiAliasGranularity(uint FixedColors, uint BlendColors);
  int Bpp(void) { return bpp; }
  void Reset(void);
  int Index(tColor Color);
  tColor Color(int Index) { return Index < maxColors ? color[Index] : 0; }
  void SetBpp(int Bpp);
  void SetColor(int Index, tColor Color);
  const tColor *Colors(int &NumColors);
  void Take(const cPalette &Palette, tIndexes *Indexes = NULL, tColor ColorFg = 0, tColor ColorBg = 0);
  void Replace(const cPalette &Palette);
  tColor Blend(tColor ColorFg, tColor ColorBg, uint8_t Level);
  int ClosestColor(tColor Color, int MaxDiff = INT_MAX);
  };

enum eTextAlignment { taCenter  = 0x00,
                      taLeft    = 0x01,
                      taRight   = 0x02,
                      taTop     = 0x04,
                      taBottom  = 0x08,
                      taDefault = taTop | taLeft
                    };

class cFont;

class cBitmap : public cPalette {
private:
  tIndex *bitmap;
  int x0, y0;
  int width, height;
  int dirtyX1, dirtyY1, dirtyX2, dirtyY2;
public:
  cBitmap(int Width, int Height, int Bpp, int X0 = 0, int Y0 = 0);
  cBitmap(const char *FileName);
  cBitmap(const char *const Xpm[]);
  virtual ~cBitmap();
  int X0(void) const { return x0; }
  int Y0(void) const { return y0; }
  int Width(void) const { return width; }
  int Height(void) const { return height; }
  void SetSize(int Width, int Height);
  bool Contains(int x, int y) const;
  bool Covers(int x1, int y1, int x2, int y2) const;
  bool Intersects(int x1, int y1, int x2, int y2) const;
  bool Dirty(int &x1, int &y1, int &x2, int &y2);
  void Clean(void);
  bool LoadXpm(const char *FileName);
  bool SetXpm(const char *const Xpm[], bool IgnoreNone = false);
  void SetIndex(int x, int y, tIndex Index);
  void DrawPixel(int x, int y, tColor Color);
  void DrawBitmap(int x, int y, const cBitmap &Bitmap, tColor ColorFg = 0, tColor ColorBg = 0, bool ReplacePalette = false, bool Overlay = false);
  void DrawText(int x, int y, const char *s, tColor ColorFg, tColor ColorBg, const cFont *Font, int Width = 0, int Height = 0, int Alignment = taDefault);
  void DrawRectangle(int x1, int y1, int x2, int y2, tColor Color);
  void DrawEllipse(int x1, int y1, int x2, int y2, tColor Color, int Quadrants = 0);
  void DrawSlope(int x1, int y1, int x2, int y2, tColor Color, int Type);
  const tIndex *Data(int x, int y);
  tColor GetColor(int x, int y) { return Color(*Data(x, y)); }
  };

struct tArea {
  int x1, y1, x2, y2;
  int bpp;
  int Width(void) const { return x2 - x1 + 1; }
  int Height(void) const { return y2 - y1 + 1; }
  bool Intersects(const tArea &Area) const { return !(x2 < Area.x1 || x1 > Area.x2 || y2 < Area.y1 || y1 > Area.y2); }
  };

#define MAXOSDAREAS 16

class cOsd {
  friend class cOsdProvider;
private:
  static int osdLeft, osdTop, osdWidth, osdHeight;
  static int isOpen;
  cBitmap *savedRegion;
  cBitmap *bitmaps[MAXOSDAREAS];
  int numBitmaps;
  int left, top, width, height;
protected:
  cOsd(int Left, int Top);
public:
  virtual ~cOsd();
  static int OsdLeft(void) { return osdLeft ? osdLeft : Setup.OSDLeft; }
  static int OsdTop(void) { return osdTop ? osdTop : Setup.OSDTop; }
  static int OsdWidth(void) { return osdWidth ? osdWidth : Setup.OSDWidth; }
  static int OsdHeight(void) { return osdHeight ? osdHeight : Setup.OSDHeight; }
  static void SetOsdPostion(int Left, int Top, int Width, int Height);
  static int IsOpen(void) { return isOpen; }
  int Left(void) { return left; }
  int Top(void) { return top; }
  int Width(void) { return width; }
  int Height(void) { return height; }
  void SetAntiAliasGranularity(uint FixedColors, uint BlendColors);
  cBitmap *GetBitmap(int Area);
  virtual eOsdError CanHandleAreas(const tArea *Areas, int NumAreas);
  virtual eOsdError SetAreas(const tArea *Areas, int NumAreas);
  virtual void SaveRegion(int x1, int y1, int x2, int y2);
  virtual void RestoreRegion(void);
  virtual eOsdError SetPalette(const cPalette &Palette, int Area);
  virtual void DrawPixel(int x, int y, tColor Color);
  virtual void DrawBitmap(int x, int y, const cBitmap &Bitmap, tColor ColorFg = 0, tColor ColorBg = 0, bool ReplacePalette = false, bool Overlay = false);
  virtual void DrawText(int x, int y, const char *s, tColor ColorFg, tColor ColorBg, const cFont *Font, int Width = 0, int Height = 0, int Alignment = taDefault);
  virtual void DrawRectangle(int x1, int y1, int x2, int y2, tColor Color);
  virtual void DrawEllipse(int x1, int y1, int x2, int y2, tColor Color, int Quadrants = 0);
  virtual void DrawSlope(int x1, int y1, int x2, int y2, tColor Color, int Type);
  virtual void Flush(void);
  };

class cOsdProvider {
private:
  static cOsdProvider *osdProvider;
protected:
  virtual cOsd *CreateOsd(int Left, int Top) = 0;
public:
  cOsdProvider(void);
      //XXX maybe parameter to make this one "sticky"??? (frame-buffer etc.)
  virtual ~cOsdProvider();
  static cOsd *NewOsd(int Left, int Top);
  static void Shutdown(void);
  };

class cTextScroller {
private:
  cOsd *osd;
  int left, top, width, height;
  const cFont *font;
  tColor colorFg, colorBg;
  int offset, shown;
  cTextWrapper textWrapper;
  void DrawText(void);
public:
  cTextScroller(void);
  cTextScroller(cOsd *Osd, int Left, int Top, int Width, int Height, const char *Text, const cFont *Font, tColor ColorFg, tColor ColorBg);
  void Set(cOsd *Osd, int Left, int Top, int Width, int Height, const char *Text, const cFont *Font, tColor ColorFg, tColor ColorBg);
  void Reset(void);
  int Left(void) { return left; }
  int Top(void) { return top; }
  int Width(void) { return width; }
  int Height(void) { return height; }
  int Total(void) { return textWrapper.Lines(); }
  int Offset(void) { return offset; }
  int Shown(void) { return shown; }
  bool CanScroll(void) { return CanScrollUp() || CanScrollDown(); }
  bool CanScrollUp(void) { return offset > 0; }
  bool CanScrollDown(void) { return offset + shown < Total(); }
  void Scroll(bool Up, bool Page);
  };

#endif //__OSD_H