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**     notice, this list of conditions and the following disclaimer.

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/*

  ORIGINAL COPYRIGHT HEADER

  PictureFlow - animated image show widget

  http://pictureflow.googlecode.com

  Copyright (C) 2007 Ariya Hidayat (ariya@kde.org)

  Permission is hereby granted, free of charge, to any person obtaining a copy

  of this software and associated documentation files (the "Software"), to deal

  in the Software without restriction, including without limitation the rights

  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  copies of the Software, and to permit persons to whom the Software is

  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in

  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  THE SOFTWARE.

*/

#include "pictureflow.h"

#include <QBasicTimer>

#include <QCache>

#include <QImage>

#include <QKeyEvent>

#include <QPainter>

#include <QPixmap>

#include <QTimer>

#include <QVector>

#include <QWidget>

#include <QTime>

#ifdef Q_WS_QWS

#include <QScreen>

#endif

#include <QDebug>

static const int captionFontSize =

#ifdef Q_WS_S60

    8;

#else

    14;

#endif

// uncomment this to enable bilinear filtering for texture mapping

// gives much better rendering, at the cost of memory space

// #define PICTUREFLOW_BILINEAR_FILTER

// for fixed-point arithmetic, we need minimum 32-bit long

// long long (64-bit) might be useful for multiplication and division

typedef long PFreal;

typedef unsigned short QRgb565;

#define RGB565_RED_MASK 0xF800

#define RGB565_GREEN_MASK 0x07E0

#define RGB565_BLUE_MASK 0x001F

#define RGB565_RED(col) ((col&RGB565_RED_MASK)>>11)

#define RGB565_GREEN(col) ((col&RGB565_GREEN_MASK)>>5)

#define RGB565_BLUE(col) (col&RGB565_BLUE_MASK)

#define PFREAL_SHIFT 10

#define PFREAL_FACTOR (1 << PFREAL_SHIFT)

#define PFREAL_ONE (1 << PFREAL_SHIFT)

#define PFREAL_HALF (PFREAL_ONE >> 1)

inline PFreal fmul(PFreal a, PFreal b)

{

  return ((long long)(a))*((long long)(b)) >> PFREAL_SHIFT;

}

inline PFreal fdiv(PFreal num, PFreal den)

{

  long long p = (long long)(num) << (PFREAL_SHIFT*2);

  long long q = p / (long long)den;

  long long r = q >> PFREAL_SHIFT;

  return r;

}

inline float fixedToFloat(PFreal val)

{

  return ((float)val) / (float)PFREAL_ONE;

}

inline PFreal floatToFixed(float val)

{

  return (PFreal)(val*PFREAL_ONE);

}

#define IANGLE_MAX 1024

#define IANGLE_MASK 1023

// warning: regenerate the table if IANGLE_MAX and PFREAL_SHIFT are changed!

static const PFreal sinTable[IANGLE_MAX] = {

     3,      9,     15,     21,     28,     34,     40,     47,

    53,     59,     65,     72,     78,     84,     90,     97,

   103,    109,    115,    122,    128,    134,    140,    147,

   153,    159,    165,    171,    178,    184,    190,    196,

   202,    209,    215,    221,    227,    233,    239,    245,

   251,    257,    264,    270,    276,    282,    288,    294,

   300,    306,    312,    318,    324,    330,    336,    342,

   347,    353,    359,    365,    371,    377,    383,    388,

   394,    400,    406,    412,    417,    423,    429,    434,

   440,    446,    451,    457,    463,    468,    474,    479,

   485,    491,    496,    501,    507,    512,    518,    523,

   529,    534,    539,    545,    550,    555,    561,    566,

   571,    576,    581,    587,    592,    597,    602,    607,

   612,    617,    622,    627,    632,    637,    642,    647,

   652,    656,    661,    666,    671,    675,    680,    685,

   690,    694,    699,    703,    708,    712,    717,    721,

   726,    730,    735,    739,    743,    748,    752,    756,

   760,    765,    769,    773,    777,    781,    785,    789,

   793,    797,    801,    805,    809,    813,    816,    820,

   824,    828,    831,    835,    839,    842,    846,    849,

   853,    856,    860,    863,    866,    870,    873,    876,

   879,    883,    886,    889,    892,    895,    898,    901,

   904,    907,    910,    913,    916,    918,    921,    924,

   927,    929,    932,    934,    937,    939,    942,    944,

   947,    949,    951,    954,    956,    958,    960,    963,

   965,    967,    969,    971,    973,    975,    977,    978,

   980,    982,    984,    986,    987,    989,    990,    992,

   994,    995,    997,    998,    999,   1001,   1002,   1003,

  1004,   1006,   1007,   1008,   1009,   1010,   1011,   1012,

  1013,   1014,   1015,   1015,   1016,   1017,   1018,   1018,

  1019,   1019,   1020,   1020,   1021,   1021,   1022,   1022,

  1022,   1023,   1023,   1023,   1023,   1023,   1023,   1023,

  1023,   1023,   1023,   1023,   1023,   1023,   1023,   1022,

  1022,   1022,   1021,   1021,   1020,   1020,   1019,   1019,

  1018,   1018,   1017,   1016,   1015,   1015,   1014,   1013,

  1012,   1011,   1010,   1009,   1008,   1007,   1006,   1004,

  1003,   1002,   1001,    999,    998,    997,    995,    994,

   992,    990,    989,    987,    986,    984,    982,    980,

   978,    977,    975,    973,    971,    969,    967,    965,

   963,    960,    958,    956,    954,    951,    949,    947,

   944,    942,    939,    937,    934,    932,    929,    927,

   924,    921,    918,    916,    913,    910,    907,    904,

   901,    898,    895,    892,    889,    886,    883,    879,

   876,    873,    870,    866,    863,    860,    856,    853,

   849,    846,    842,    839,    835,    831,    828,    824,

   820,    816,    813,    809,    805,    801,    797,    793,

   789,    785,    781,    777,    773,    769,    765,    760,

   756,    752,    748,    743,    739,    735,    730,    726,

   721,    717,    712,    708,    703,    699,    694,    690,

   685,    680,    675,    671,    666,    661,    656,    652,

   647,    642,    637,    632,    627,    622,    617,    612,

   607,    602,    597,    592,    587,    581,    576,    571,

   566,    561,    555,    550,    545,    539,    534,    529,

   523,    518,    512,    507,    501,    496,    491,    485,

   479,    474,    468,    463,    457,    451,    446,    440,

   434,    429,    423,    417,    412,    406,    400,    394,

   388,    383,    377,    371,    365,    359,    353,    347,

   342,    336,    330,    324,    318,    312,    306,    300,

   294,    288,    282,    276,    270,    264,    257,    251,

   245,    239,    233,    227,    221,    215,    209,    202,

   196,    190,    184,    178,    171,    165,    159,    153,

   147,    140,    134,    128,    122,    115,    109,    103,

    97,     90,     84,     78,     72,     65,     59,     53,

    47,     40,     34,     28,     21,     15,      9,      3,

    -4,    -10,    -16,    -22,    -29,    -35,    -41,    -48,

   -54,    -60,    -66,    -73,    -79,    -85,    -91,    -98,

  -104,   -110,   -116,   -123,   -129,   -135,   -141,   -148,

  -154,   -160,   -166,   -172,   -179,   -185,   -191,   -197,

  -203,   -210,   -216,   -222,   -228,   -234,   -240,   -246,

  -252,   -258,   -265,   -271,   -277,   -283,   -289,   -295,

  -301,   -307,   -313,   -319,   -325,   -331,   -337,   -343,

  -348,   -354,   -360,   -366,   -372,   -378,   -384,   -389,

  -395,   -401,   -407,   -413,   -418,   -424,   -430,   -435,

  -441,   -447,   -452,   -458,   -464,   -469,   -475,   -480,

  -486,   -492,   -497,   -502,   -508,   -513,   -519,   -524,

  -530,   -535,   -540,   -546,   -551,   -556,   -562,   -567,

  -572,   -577,   -582,   -588,   -593,   -598,   -603,   -608,

  -613,   -618,   -623,   -628,   -633,   -638,   -643,   -648,

  -653,   -657,   -662,   -667,   -672,   -676,   -681,   -686,

  -691,   -695,   -700,   -704,   -709,   -713,   -718,   -722,

  -727,   -731,   -736,   -740,   -744,   -749,   -753,   -757,

  -761,   -766,   -770,   -774,   -778,   -782,   -786,   -790,

  -794,   -798,   -802,   -806,   -810,   -814,   -817,   -821,

  -825,   -829,   -832,   -836,   -840,   -843,   -847,   -850,

  -854,   -857,   -861,   -864,   -867,   -871,   -874,   -877,

  -880,   -884,   -887,   -890,   -893,   -896,   -899,   -902,

  -905,   -908,   -911,   -914,   -917,   -919,   -922,   -925,

  -928,   -930,   -933,   -935,   -938,   -940,   -943,   -945,

  -948,   -950,   -952,   -955,   -957,   -959,   -961,   -964,

  -966,   -968,   -970,   -972,   -974,   -976,   -978,   -979,

  -981,   -983,   -985,   -987,   -988,   -990,   -991,   -993,

  -995,   -996,   -998,   -999,  -1000,  -1002,  -1003,  -1004,

 -1005,  -1007,  -1008,  -1009,  -1010,  -1011,  -1012,  -1013,

 -1014,  -1015,  -1016,  -1016,  -1017,  -1018,  -1019,  -1019,

 -1020,  -1020,  -1021,  -1021,  -1022,  -1022,  -1023,  -1023,

 -1023,  -1024,  -1024,  -1024,  -1024,  -1024,  -1024,  -1024,

 -1024,  -1024,  -1024,  -1024,  -1024,  -1024,  -1024,  -1023,

 -1023,  -1023,  -1022,  -1022,  -1021,  -1021,  -1020,  -1020,

 -1019,  -1019,  -1018,  -1017,  -1016,  -1016,  -1015,  -1014,

 -1013,  -1012,  -1011,  -1010,  -1009,  -1008,  -1007,  -1005,

 -1004,  -1003,  -1002,  -1000,   -999,   -998,   -996,   -995,

  -993,   -991,   -990,   -988,   -987,   -985,   -983,   -981,

  -979,   -978,   -976,   -974,   -972,   -970,   -968,   -966,

  -964,   -961,   -959,   -957,   -955,   -952,   -950,   -948,

  -945,   -943,   -940,   -938,   -935,   -933,   -930,   -928,

  -925,   -922,   -919,   -917,   -914,   -911,   -908,   -905,

  -902,   -899,   -896,   -893,   -890,   -887,   -884,   -880,

  -877,   -874,   -871,   -867,   -864,   -861,   -857,   -854,

  -850,   -847,   -843,   -840,   -836,   -832,   -829,   -825,

  -821,   -817,   -814,   -810,   -806,   -802,   -798,   -794,

  -790,   -786,   -782,   -778,   -774,   -770,   -766,   -761,

  -757,   -753,   -749,   -744,   -740,   -736,   -731,   -727,

  -722,   -718,   -713,   -709,   -704,   -700,   -695,   -691,

  -686,   -681,   -676,   -672,   -667,   -662,   -657,   -653,

  -648,   -643,   -638,   -633,   -628,   -623,   -618,   -613,

  -608,   -603,   -598,   -593,   -588,   -582,   -577,   -572,

  -567,   -562,   -556,   -551,   -546,   -540,   -535,   -530,

  -524,   -519,   -513,   -508,   -502,   -497,   -492,   -486,

  -480,   -475,   -469,   -464,   -458,   -452,   -447,   -441,

  -435,   -430,   -424,   -418,   -413,   -407,   -401,   -395,

  -389,   -384,   -378,   -372,   -366,   -360,   -354,   -348,

  -343,   -337,   -331,   -325,   -319,   -313,   -307,   -301,

  -295,   -289,   -283,   -277,   -271,   -265,   -258,   -252,

  -246,   -240,   -234,   -228,   -222,   -216,   -210,   -203,

  -197,   -191,   -185,   -179,   -172,   -166,   -160,   -154,

  -148,   -141,   -135,   -129,   -123,   -116,   -110,   -104,

   -98,    -91,    -85,    -79,    -73,    -66,    -60,    -54,

   -48,    -41,    -35,    -29,    -22,    -16,    -10,     -4

};

// this is the program the generate the above table

#if 0

#include <stdio.h>

#include <math.h>

#ifndef M_PI

#define M_PI 3.14159265358979323846

#endif

#define PFREAL_ONE 1024

#define IANGLE_MAX 1024

int main(int, char**)

{

  FILE*f = fopen("table.c","wt");

  fprintf(f,"PFreal sinTable[] = {\n");

  for(int i = 0; i < 128; i++)

  {

    for(int j = 0; j < 8; j++)

    {

      int iang = j+i*8;

      double ii = (double)iang + 0.5;

      double angle = ii * 2 * M_PI / IANGLE_MAX;

      double sinAngle = sin(angle);

      fprintf(f,"%6d, ", (int)(floor(PFREAL_ONE*sinAngle)));

    }

    fprintf(f,"\n");

  }

  fprintf(f,"};\n");

  fclose(f);

  return 0;

}

#endif

inline PFreal fsin(int iangle)

{

  while(iangle < 0)

    iangle += IANGLE_MAX;

  return sinTable[iangle & IANGLE_MASK];

}

inline PFreal fcos(int iangle)

{

  // quarter phase shift

  return fsin(iangle + (IANGLE_MAX >> 2));

}

struct SlideInfo

{

  int slideIndex;

  int angle;

  PFreal cx;

  PFreal cy;

};

class PictureFlowPrivate

{

public:

  PictureFlowPrivate(PictureFlow* widget);

  int slideCount() const;

  void setSlideCount(int count);

  QSize slideSize() const;

  void setSlideSize(QSize size);

  int zoomFactor() const;

  void setZoomFactor(int z);

  QImage slide(int index) const;

  void setSlide(int index, const QImage& image);

  int currentSlide() const;

  void setCurrentSlide(int index);

  int getTarget() const;

  void showPrevious();

  void showNext();

  void showSlide(int index);

  void resize(int w, int h);

  void render();

  void startAnimation();

  void updateAnimation();

  void clearSurfaceCache();

  QImage buffer;

  QBasicTimer animateTimer;

  bool   singlePress;

  int    singlePressThreshold;

  QPoint firstPress;

  QPoint previousPos;

  QTime  previousPosTimestamp;

  int    pixelDistanceMoved;

  int    pixelsToMovePerSlide;

  QVector<QString> captions;

private:

  PictureFlow* widget;

  int slideWidth;

  int slideHeight;

  int zoom;

  QVector<QImage> slideImages;

  int centerIndex;

  SlideInfo centerSlide;

  QVector<SlideInfo> leftSlides;

  QVector<SlideInfo> rightSlides;

  QVector<PFreal> rays;

  int itilt;

  int spacing;

  PFreal offsetX;

  PFreal offsetY;

  QImage blankSurface;

  QCache<int, QImage> surfaceCache;

  QTimer triggerTimer;

  int slideFrame;

  int step;

  int target;

  int fade;

  void recalc(int w, int h);

  QRect renderSlide(const SlideInfo &slide, int alpha=256, int col1=-1, int col=-1);

  QImage* surface(int slideIndex);

  void triggerRender();

  void resetSlides();

};

PictureFlowPrivate::PictureFlowPrivate(PictureFlow* w)

{

  widget = w;

  slideWidth = 200;

  slideHeight = 200;

  zoom = 100;

  centerIndex = 0;

  slideFrame = 0;

  step = 0;

  target = 0;

  fade = 256;

  triggerTimer.setSingleShot(true);

  triggerTimer.setInterval(0);

  QObject::connect(&triggerTimer, SIGNAL(timeout()), widget, SLOT(render()));

  recalc(200, 200);

  resetSlides();

}

int PictureFlowPrivate::slideCount() const

{

  return slideImages.count();

}

void PictureFlowPrivate::setSlideCount(int count)

{

  slideImages.resize(count);

  captions.resize(count);

  surfaceCache.clear();

  resetSlides();

  triggerRender();

}

QSize PictureFlowPrivate::slideSize() const

{

  return QSize(slideWidth, slideHeight);

}

void PictureFlowPrivate::setSlideSize(QSize size)

{

  slideWidth = size.width();

  slideHeight = size.height();

  recalc(buffer.width(), buffer.height());

  triggerRender();

}

int PictureFlowPrivate::zoomFactor() const

{

  return zoom;

}

void PictureFlowPrivate::setZoomFactor(int z)

{

  if(z <= 0)

    return;

  zoom = z;

  recalc(buffer.width(), buffer.height());

  triggerRender();

}

QImage PictureFlowPrivate::slide(int index) const

{

  return slideImages[index];

}

void PictureFlowPrivate::setSlide(int index, const QImage& image)

{

  if((index >= 0) && (index < slideImages.count()))

  {

    slideImages[index] = image;

    surfaceCache.remove(index);

    triggerRender();

  }

}

int PictureFlowPrivate::getTarget() const

{

  return target;

}

int PictureFlowPrivate::currentSlide() const

{

  return centerIndex;

}

void PictureFlowPrivate::setCurrentSlide(int index)

{

  step = 0;

  centerIndex = qBound(index, 0, slideImages.count()-1);

  target = centerIndex;

  slideFrame = index << 16;

  resetSlides();

  triggerRender();

}

void PictureFlowPrivate::showPrevious()

{

  if(step >= 0)

  {

    if(centerIndex > 0)

    {

      target--;

      startAnimation();

    }

  }

  else

  {

    target = qMax(0, centerIndex - 2);

  }

}