/* * snellen.h * * Created on: Nov 2, 2008 * Author: Andrew Howlett, Daniel Eriksen * Last Edit: May 15, 2009 */ #ifndef SNELLEN_H_ #define SNELLEN_H_ #include /* * The ten snellen octotype letters: C D E F L N O P T Z * The ten sloan octotype glyphs: C D H K N O R S V Z * * Note: we will start numbering the snellen letters at 1, and * character 0 will be a blank or space. */ char glyphs[3][17] = {" 00000", " CDEFLNOPTZAVHBG"," CDHKNORSVZ00000"}; char glyphsEnumToChar[3][17]={" 00000", "0CDEFLNOPTZAVHBG","0CDHKNORSVZ00000"}; enum snellenGlyphsEnum { c=1,d,e,f,l,n,o,p,t,z,a,v,h,b,g } ; enum sloanGlyphsEnum { C=1,D,H,K,N,O,R,S,V,Z }; /* * Screen height in mm as measured by a ruler. * The profile-3 measures 230mm in height * * US Standard distance is 4m */ int screen_height_mm = 250; int distance_to_patient = 4000; /* * The StateType stores the state of the finite state machine. The state * can be fully described by the size of the text being displayed, the number * of letters being displayed, the letters being displayed, and which * letter (numbered starting at 0 from the left) is displayed first. */ typedef struct { int active; /* 1 means the mask is in use */ int numLettersDisplayed; int firstLetterDisplayed; int topX; int topY; int height; int width; } MaskType; MaskType noMask = { 0, 0, 0, 0, 0, 0, 0}; typedef struct { int size; char name[4]; float mar; /* Minimum Angle of Resolution - x5=Minutes Of Arc - x20=line*/ char letters[11]; /* maximum of 11 characters in a line */ int numLetters; int topX; int topY; float blockSize; } LineType; /* these are the default lines * first (0) block is for primitives (could have left it empty, but cut and paste * is easier) * second (1) block is for snellen * third (2) block is for sloan */ LineType defaultLine[3][15] = { { { 0, " ", 0 , { }, 0, 0, 0, 0 }, /* null line for size zero */ { 1, "200", 10 , {e}, 1, 0, 0, 0 }, // 200 { 2, "160", 8 , {a,p}, 2, 0, 0, 0 }, // 160 { 3, "125", 6.25, {d,o}, 2, 0, 0, 0 }, // 125 { 4, "100", 5 , {p,h,t}, 3, 0, 0, 0 }, // 100 { 5, "80" , 4 , {v,l,n,e}, 4, 0, 0, 0 }, // 80 { 6, "60" , 3 , {d,a,o,f}, 4, 0, 0, 0 }, // 60 { 7, "50" , 2.5 , {e,g,n,d,h}, 5, 0, 0, 0 }, // 50 { 8, "40" , 2 , {f,z,b,d,e}, 5, 0, 0, 0 }, // 40 { 9, "30" , 1.5 , {o,f,l,c,t}, 5, 0, 0, 0 }, // 30 {10, "25" , 1.25, {a,p,e,o,t}, 5, 0, 0, 0 }, // 25 {11, "20" , 1 , {t,z,v,o,a}, 5, 0, 0, 0 }, // 20 {12, "15" , 0.75, {o,h,p,n,t}, 5, 0, 0, 0 }, // 15 {13, "12" , 0.6, {t,z,v,o,a}, 5, 0, 0, 0 }, // 12 // not on typical chart {14, "10" , 0.5, {o,h,p,n,t}, 5, 0, 0, 0 } // 10 // not on typical chart }, { { 0, " ", 0 , { }, 0, 0, 0, 0 }, /* null line for size zero */ { 1, "200", 10 , {e}, 1, 0, 0, 0 }, // 200 { 2, "160", 8 , {a,p}, 2, 0, 0, 0 }, // 160 { 3, "125", 6.25, {d,o}, 2, 0, 0, 0 }, // 125 { 4, "100", 5 , {p,h,t}, 3, 0, 0, 0 }, // 100 { 5, "80" , 4 , {v,l,n,e}, 4, 0, 0, 0 }, // 80 { 6, "60" , 3 , {d,a,o,f}, 4, 0, 0, 0 }, // 60 { 7, "50" , 2.5 , {e,g,n,d,h}, 5, 0, 0, 0 }, // 50 { 8, "40" , 2 , {f,z,b,d,e}, 5, 0, 0, 0 }, // 40 { 9, "30" , 1.5 , {o,f,l,c,t}, 5, 0, 0, 0 }, // 30 {10, "25" , 1.25, {a,p,e,o,t}, 5, 0, 0, 0 }, // 25 {11, "20" , 1 , {t,z,v,o,a}, 5, 0, 0, 0 }, // 20 {12, "15" , 0.75, {o,h,p,n,t}, 5, 0, 0, 0 }, // 15 {13, "12" , 0.6, {t,z,v,o,a}, 5, 0, 0, 0 }, // 12 // not on typical chart {14, "10" , 0.5, {o,h,p,n,t}, 5, 0, 0, 0 } // 10 // not on typical chart }, { { 0, " ", 0 , { }, 0, 0, 0, 0 }, /* null line for size zero */ { 1, "1.0", 10 , {O,H,R,Z,K}, 5, 0, 0, 0 }, // 1.0 { 2, "0.9", 8 , {Z,V,O,H,R}, 5, 0, 0, 0 }, // .9 { 3, "0.8", 6.25, {C,O,H,S,K}, 5, 0, 0, 0 }, // .8 { 4, "0.7", 5 , {O,V,N,C,Z}, 5, 0, 0, 0 }, // .7 { 5, "0.6" , 4 , {V,H,N,D,O}, 5, 0, 0, 0 }, // .6 { 6, "0.5" , 3.15, {S,R,O,K,D}, 5, 0, 0, 0 }, // .5 { 7, "0.4" , 2.5 , {N,K,C,D,V}, 5, 0, 0, 0 }, // .4 { 8, "0.3" , 2 , {S,N,C,H,D}, 5, 0, 0, 0 }, // .3 { 9, "0.2" , 1.6 , {V,O,K,R,N}, 5, 0, 0, 0 }, // .2 {10, "0.1" , 1.25, {K,O,N,C,H}, 5, 0, 0, 0 }, // .1 {11, "0.0" , 1 , {C,V,H,D,S}, 5, 0, 0, 0 }, // 0.0 {12, "-.1" , 0.8, {O,Z,S,K,V}, 5, 0, 0, 0 }, // -.1 {13, "-.2" , 0.625, {D,H,K,Z,R}, 5, 0, 0, 0 }, // -.2 {14, "-.3" , 0.5, {R,N,Z,O,S}, 5, 0, 0, 0 } // -.3 } }; typedef struct { LineType line; MaskType mask; int randomModeOn; int truetypeMode; // 0 for primitives, 1 for snellen, 2 for sloan int mirrorModeOn; } StateType; /* * this type helps * with the set height and distance * menu */ typedef struct { int topX; int topY; int width; int height; } MenuSpecsType; /* * function prototypes */ void InitializeDirectFB(int argc, char **argv); void CloseDirectFB(); void EventLoop(); DFBInputDeviceKeyIdentifier GetKeyPress (); void PaintRowOfLetters (); float CalculateLineHeight (); void CalculateTopXTopYBlockSize (); void PaintLetter (char letter, int topX, int topY, float blockSize); void TruetypeCreateFont (float blockSize); void TruetypeToggleMode(); void TruetypePrintLetter(int letter, int topX, int topY, float blockSize); void CreateMask (int maskSize); void RemoveMask (); void ApplyMask(); void MoveMaskLeft(); void MoveMaskRight(); void MoveMaskRender(int topX, int topY, int width, int height); void MirrorModeToggle(); void ToggleRandomMode (); void CreateRandomLine(); int MyRandom(int N); void HelpShowCurrentState(); void SleepQuarterSecond(); void Screensaver(); void Help(); void WaitForEventWithScreensaver(IDirectFBEventBuffer* eventBuffer); void WaitForEventWithScreensaverNoDebounce(IDirectFBEventBuffer* eventBuffer); void ReadConfiguration(); void WriteConfiguration(); void ChangeDistanceAndScreenHeight(); void DrawDistanceOrHeightSurface(MenuSpecsType *menuSpecs); void DrawBoxAroundChoice(MenuSpecsType menuSpecs, int choice); void SetDistance(); void SetHeight(); #endif /* SNELLEN_H_ */