diff options
Diffstat (limited to 'osd.h')
| -rw-r--r-- | osd.h | 44 |
1 files changed, 41 insertions, 3 deletions
@@ -4,12 +4,13 @@ * See the main source file 'vdr.c' for copyright information and * how to reach the author. * - * $Id: osd.h 1.53 2006/02/26 14:45:05 kls Exp $ + * $Id: osd.h 1.54 2007/06/10 12:15:52 kls Exp $ */ #ifndef __OSD_H #define __OSD_H +#include <limits.h> #include <stdio.h> #include <stdint.h> #include "font.h" @@ -41,7 +42,7 @@ enum eOsdError { oeOk, oeUnknown, }; -typedef uint32_t tColor; +typedef uint32_t tColor; // see also font.h typedef uint8_t tIndex; class cPalette { @@ -50,11 +51,22 @@ private: int bpp; int maxColors, numColors; bool modified; + double antiAliasGranularity; protected: typedef tIndex tIndexes[MAXNUMCOLORS]; public: cPalette(int Bpp = 8); ///< Initializes the palette with the given color depth. + void SetAntiAliasGranularity(uint FixedColors, uint BlendColors); + ///< Allows the system to optimize utilization of the limited color + ///< palette entries when generating blended colors for anti-aliasing. + ///< FixedColors is the maximum number of colors used, and BlendColors + ///< is the maximum number of foreground/background color combinations + ///< used with anti-aliasing. If this function is not called with + ///< useful values, the palette may be filled up with many shades of + ///< a single color combination, and may not be able to serve all + ///< requested colors. By default the palette assumes there will be + ///< 10 fixed colors and 10 color combinations. int Bpp(void) { return bpp; } void Reset(void); ///< Resets the palette, making it contain no colors. @@ -62,7 +74,7 @@ public: ///< Returns the index of the given Color (the first color has index 0). ///< If Color is not yet contained in this palette, it will be added if ///< there is a free slot. If the color can't be added to this palette, - ///< 0 will be returned. + ///< the closest existing color will be returned. tColor Color(int Index) { return Index < maxColors ? color[Index] : 0; } ///< Returns the color at the given Index. If Index is outside the valid ///< range, 0 will be returned. @@ -88,6 +100,18 @@ public: void Replace(const cPalette &Palette); ///< Replaces the colors of this palette with the colors from the given ///< palette. + tColor Blend(tColor ColorFg, tColor ColorBg, uint8_t Level); + ///< Determines a color that consists of a linear blend between ColorFg + ///< and ColorBg. If Level is 0, the result is ColorBg, if it is 255, + ///< the result is ColorFg. If SetAntiAliasGranularity() has been called previously, + ///< Level will be mapped to a limited range of levels that allow to make best + ///< use of the palette entries. + int ClosestColor(tColor Color, int MaxDiff = INT_MAX); + ///< Returns the index of a color in this paltte that is closest to the given + ///< Color. MaxDiff can be used to control the maximum allowed color difference. + ///< If no color with a maximum difference of MaxDiff can be found, -1 will + ///< be returned. With the default value of INT_MAX, there will always be + ///< a valid color index returned, but the color may be completely different. }; enum eTextAlignment { taCenter = 0x00, @@ -98,6 +122,8 @@ enum eTextAlignment { taCenter = 0x00, taDefault = taTop | taLeft }; +class cFont; + class cBitmap : public cPalette { private: tIndex *bitmap; @@ -202,6 +228,8 @@ public: ///< 7: vertical, falling, upper const tIndex *Data(int x, int y); ///< Returns the address of the index byte at the given coordinates. + tColor GetColor(int x, int y) { return Color(*Data(x, y)); } + ///< Returns the color at the given coordinates. }; struct tArea { @@ -247,6 +275,16 @@ public: int Top(void) { return top; } int Width(void) { return width; } int Height(void) { return height; } + void SetAntiAliasGranularity(uint FixedColors, uint BlendColors); + ///< Allows the system to optimize utilization of the limited color + ///< palette entries when generating blended colors for anti-aliasing. + ///< FixedColors is the maximum number of colors used, and BlendColors + ///< is the maximum number of foreground/background color combinations + ///< used with anti-aliasing. If this function is not called with + ///< useful values, the palette may be filled up with many shades of + ///< a single color combination, and may not be able to serve all + ///< requested colors. By default the palette assumes there will be + ///< 10 fixed colors and 10 color combinations. cBitmap *GetBitmap(int Area); ///< Returns a pointer to the bitmap for the given Area, or NULL if no ///< such bitmap exists. |