Revision control
++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ /*
++ ORIGINAL COPYRIGHT HEADER
++ PictureFlow - animated image show widget
++
++ 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 <QList>
++ #include <QWidget>
++ #include <QElapsedTimer>
++
++ #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;
++ QElapsedTimer previousPosTimestamp;
++ int pixelDistanceMoved;
++ int pixelsToMovePerSlide;
++
++ QList<QString> captions;
++
++ private:
++ PictureFlow* widget;
++
++ int slideWidth;
++ int slideHeight;
++ int zoom;
++
++ QList<QImage> slideImages;
++ int centerIndex;
++ SlideInfo centerSlide;
++ QList<SlideInfo> leftSlides;
++ QList<SlideInfo> rightSlides;
++
++ QList<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, &QTimer::timeout, widget, &PictureFlow::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);
++ }
++ }
++
++ void PictureFlowPrivate::showNext()
++ {
++ if(step <= 0)
++ {
++ if(centerIndex < slideImages.count()-1)
++ {
++ target++;
++ startAnimation();
++ }
++ }
++ else
++ {
++ target = qMin(centerIndex + 2, slideImages.count()-1);
++ }
++ }
++
++ void PictureFlowPrivate::showSlide(int index)
++ {
++ index = qMax(index, 0);
++ index = qMin(slideImages.count()-1, index);
++ if(index == centerSlide.slideIndex)
++ return;
++
++ target = index;
++ startAnimation();
++ }
++
++ void PictureFlowPrivate::resize(int w, int h)
++ {
++ recalc(w, h);
++ resetSlides();
++ triggerRender();
++ }
++
++
++ // adjust slides so that they are in "steady state" position
++ void PictureFlowPrivate::resetSlides()
++ {
++ centerSlide.angle = 0;
++ centerSlide.cx = 0;
++ centerSlide.cy = 0;
++ centerSlide.slideIndex = centerIndex;
++
++ leftSlides.clear();
++ leftSlides.resize(3);
++ for(int i = 0; i < leftSlides.count(); i++)
++ {
++ SlideInfo& si = leftSlides[i];
++ si.angle = itilt;
++ si.cx = -(offsetX + spacing*i*PFREAL_ONE);
++ si.cy = offsetY;
++ si.slideIndex = centerIndex-1-i;
++ //qDebug() << "Left[" << i << "] x=" << fixedToFloat(si.cx) << ", y=" << fixedToFloat(si.cy) ;
++ }
++
++ rightSlides.clear();
++ rightSlides.resize(3);
++ for(int i = 0; i < rightSlides.count(); i++)
++ {
++ SlideInfo& si = rightSlides[i];
++ si.angle = -itilt;
++ si.cx = offsetX + spacing*i*PFREAL_ONE;
++ si.cy = offsetY;
++ si.slideIndex = centerIndex+1+i;
++ //qDebug() << "Right[" << i << "] x=" << fixedToFloat(si.cx) << ", y=" << fixedToFloat(si.cy) ;
++ }
++ }
++
++ #define BILINEAR_STRETCH_HOR 4
++ #define BILINEAR_STRETCH_VER 4
++
++ static QImage prepareSurface(QImage img, int w, int h)
++ {
++ Qt::TransformationMode mode = Qt::SmoothTransformation;
++ img = img.scaled(w, h, Qt::IgnoreAspectRatio, mode);
++
++ // slightly larger, to accommodate for the reflection
++ int hs = h * 2;
++ int hofs = h / 3;
++
++ // offscreen buffer: black is sweet
++ QImage result(hs, w, QImage::Format_RGB16);
++ result.fill(0);
++
++ // transpose the image, this is to speed-up the rendering
++ // because we process one column at a time
++ // (and much better and faster to work row-wise, i.e in one scanline)
++ for(int x = 0; x < w; x++)
++ for(int y = 0; y < h; y++)
++ result.setPixel(hofs + y, x, img.pixel(x, y));
++
++ // create the reflection
++ int ht = hs - h - hofs;
++ int hte = ht;
++ for(int x = 0; x < w; x++)
++ for(int y = 0; y < ht; y++)
++ {
++ QRgb color = img.pixel(x, img.height()-y-1);
++ //QRgb565 color = img.scanLine(img.height()-y-1) + x*sizeof(QRgb565); //img.pixel(x, img.height()-y-1);
++ int a = qAlpha(color);
++ int r = qRed(color) * a / 256 * (hte - y) / hte * 3/5;
++ int g = qGreen(color) * a / 256 * (hte - y) / hte * 3/5;
++ int b = qBlue(color) * a / 256 * (hte - y) / hte * 3/5;
++ result.setPixel(h+hofs+y, x, qRgb(r, g, b));
++ }
++
++ #ifdef PICTUREFLOW_BILINEAR_FILTER
++ int hh = BILINEAR_STRETCH_VER*hs;
++ int ww = BILINEAR_STRETCH_HOR*w;
++ result = result.scaled(hh, ww, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
++ #endif
++
++ return result;
++ }
++
++
++ // get transformed image for specified slide
++ // if it does not exist, create it and place it in the cache
++ QImage* PictureFlowPrivate::surface(int slideIndex)
++ {
++ if(slideIndex < 0)
++ return 0;
++ if(slideIndex >= slideImages.count())
++ return 0;
++
++ if(surfaceCache.contains(slideIndex))
++ return surfaceCache[slideIndex];
++
++ QImage img = widget->slide(slideIndex);
++ if(img.isNull())
++ {
++ if(blankSurface.isNull())
++ {
++ blankSurface = QImage(slideWidth, slideHeight, QImage::Format_RGB16);
++
++ QPainter painter(&blankSurface);
++ QPoint p1(slideWidth*4/10, 0);
++ QPoint p2(slideWidth*6/10, slideHeight);
++ QLinearGradient linearGrad(p1, p2);
++ linearGrad.setColorAt(0, Qt::black);
++ linearGrad.setColorAt(1, Qt::white);
++ painter.setBrush(linearGrad);
++ painter.fillRect(0, 0, slideWidth, slideHeight, QBrush(linearGrad));
++
++ painter.setPen(QPen(QColor(64,64,64), 4));
++ painter.setBrush(QBrush());
++ painter.drawRect(2, 2, slideWidth-3, slideHeight-3);
++ painter.end();
++ blankSurface = prepareSurface(blankSurface, slideWidth, slideHeight);
++ }
++ return &blankSurface;
++ }
++
++ surfaceCache.insert(slideIndex, new QImage(prepareSurface(img, slideWidth, slideHeight)));
++ return surfaceCache[slideIndex];
++ }
++
++
++ // Schedules rendering the slides. Call this function to avoid immediate
++ // render and thus cause less flicker.
++ void PictureFlowPrivate::triggerRender()
++ {
++ triggerTimer.start();
++ }
++
++ // Render the slides. Updates only the offscreen buffer.
++ void PictureFlowPrivate::render()
++ {
++ buffer.fill(0);
++
++ int nleft = leftSlides.count();
++ int nright = rightSlides.count();
++
++ QRect r = renderSlide(centerSlide);
++ int c1 = r.left();
++ int c2 = r.right();
++
++ if(step == 0)
++ {
++ // no animation, boring plain rendering
++ for(int index = 0; index < nleft-1; index++)
++ {
++ int alpha = (index < nleft-2) ? 256 : 128;
++ QRect rs = renderSlide(leftSlides[index], alpha, 0, c1-1);
++ if(!rs.isEmpty())
++ c1 = rs.left();
++ }
++ for(int index = 0; index < nright-1; index++)
++ {
++ int alpha = (index < nright-2) ? 256 : 128;
++ QRect rs = renderSlide(rightSlides[index], alpha, c2+1, buffer.width());
++ if(!rs.isEmpty())
++ c2 = rs.right();
++ }
++
++ QPainter painter;
++ painter.begin(&buffer);
++
++ QFont font("Arial", captionFontSize);
++ font.setBold(true);
++ painter.setFont(font);
++ painter.setPen(Qt::white);
++ //painter.setPen(QColor(255,255,255,127));
++
++ if (!captions.isEmpty())
++ painter.drawText( QRect(0,0, buffer.width(), (buffer.height() - slideSize().height())/4),
++ Qt::AlignCenter, captions[centerIndex]);
++
++ painter.end();
++
++ }
++ else
++ {
++ // the first and last slide must fade in/fade out
++ for(int index = 0; index < nleft; index++)
++ {
++ int alpha = 256;
++ if(index == nleft-1)
++ alpha = (step > 0) ? 0 : 128-fade/2;
++ if(index == nleft-2)
++ alpha = (step > 0) ? 128-fade/2 : 256-fade/2;
++ if(index == nleft-3)
++ alpha = (step > 0) ? 256-fade/2 : 256;
++ QRect rs = renderSlide(leftSlides[index], alpha, 0, c1-1);
++ if(!rs.isEmpty())
++ c1 = rs.left();
++
++ alpha = (step > 0) ? 256-fade/2 : 256;
++ }
++ for(int index = 0; index < nright; index++)
++ {
++ int alpha = (index < nright-2) ? 256 : 128;
++ if(index == nright-1)
++ alpha = (step > 0) ? fade/2 : 0;
++ if(index == nright-2)
++ alpha = (step > 0) ? 128+fade/2 : fade/2;
++ if(index == nright-3)
++ alpha = (step > 0) ? 256 : 128+fade/2;
++ QRect rs = renderSlide(rightSlides[index], alpha, c2+1, buffer.width());
++ if(!rs.isEmpty())
++ c2 = rs.right();
++ }
++
++ QPainter painter;
++ painter.begin(&buffer);
++
++ QFont font("Arial", captionFontSize);
++ font.setBold(true);
++ painter.setFont(font);
++
++ int leftTextIndex = (step>0) ? centerIndex : centerIndex-1;
++
++ painter.setPen(QColor(255,255,255, (255-fade) ));
++ painter.drawText( QRect(0,0, buffer.width(), (buffer.height() - slideSize().height())/4),
++ Qt::AlignCenter, captions[leftTextIndex]);
++
++ painter.setPen(QColor(255,255,255, fade));
++ painter.drawText( QRect(0,0, buffer.width(), (buffer.height() - slideSize().height())/4),
++ Qt::AlignCenter, captions[leftTextIndex+1]);
++
++ painter.end();
++ }
++ }
++
++
++ static inline uint BYTE_MUL_RGB16(uint x, uint a) {
++ a += 1;
++ uint t = (((x & 0x07e0)*a) >> 8) & 0x07e0;
++ t |= (((x & 0xf81f)*(a>>2)) >> 6) & 0xf81f;
++ return t;
++ }
++
++ static inline uint BYTE_MUL_RGB16_32(uint x, uint a) {
++ uint t = (((x & 0xf81f07e0) >> 5)*a) & 0xf81f07e0;
++ t |= (((x & 0x07e0f81f)*a) >> 5) & 0x07e0f81f;
++ return t;
++ }
++
++
++ // Renders a slide to offscreen buffer. Returns a rect of the rendered area.
++ // alpha=256 means normal, alpha=0 is fully black, alpha=128 half transparent
++ // col1 and col2 limit the column for rendering.
++ QRect PictureFlowPrivate::renderSlide(const SlideInfo &slide, int alpha,
++ int col1, int col2)
++ {
++ QImage* src = surface(slide.slideIndex);
++ if(!src)
++ return QRect();
++
++ QRect rect(0, 0, 0, 0);
++
++ #ifdef PICTUREFLOW_BILINEAR_FILTER
++ int sw = src->height() / BILINEAR_STRETCH_HOR;
++ int sh = src->width() / BILINEAR_STRETCH_VER;
++ #else
++ int sw = src->height();
++ int sh = src->width();
++ #endif
++ int h = buffer.height();
++ int w = buffer.width();
++
++ if(col1 > col2)
++ {
++ int c = col2;
++ col2 = col1;
++ col1 = c;
++ }
++
++ col1 = (col1 >= 0) ? col1 : 0;
++ col2 = (col2 >= 0) ? col2 : w-1;
++ col1 = qMin(col1, w-1);
++ col2 = qMin(col2, w-1);
++
++ int distance = h * 100 / zoom;
++ PFreal sdx = fcos(slide.angle);
++ PFreal sdy = fsin(slide.angle);
++ PFreal xs = slide.cx - slideWidth * sdx/2;
++ PFreal ys = slide.cy - slideWidth * sdy/2;
++ PFreal dist = distance * PFREAL_ONE;
++
++ int xi = qMax((PFreal)0, ((w*PFREAL_ONE/2) + fdiv(xs*h, dist+ys)) >> PFREAL_SHIFT);
++ if(xi >= w)
++ return rect;
++
++ bool flag = false;
++ rect.setLeft(xi);
++ for(int x = qMax(xi, col1); x <= col2; x++)
++ {
++ PFreal hity = 0;
++ PFreal fk = rays[x];
++ if(sdy)
++ {
++ fk = fk - fdiv(sdx,sdy);
++ hity = -fdiv((rays[x]*distance - slide.cx + slide.cy*sdx/sdy), fk);
++ }
++
++ dist = distance*PFREAL_ONE + hity;
++ if(dist < 0)
++ continue;
++
++ PFreal hitx = fmul(dist, rays[x]);
++ PFreal hitdist = fdiv(hitx - slide.cx, sdx);
++
++ #ifdef PICTUREFLOW_BILINEAR_FILTER
++ int column = sw*BILINEAR_STRETCH_HOR/2 + (hitdist*BILINEAR_STRETCH_HOR >> PFREAL_SHIFT);
++ if(column >= sw*BILINEAR_STRETCH_HOR)
++ break;
++ #else
++ int column = sw/2 + (hitdist >> PFREAL_SHIFT);
++ if(column >= sw)
++ break;
++ #endif
++ if(column < 0)
++ continue;
++
++ rect.setRight(x);
++ if(!flag)
++ rect.setLeft(x);
++ flag = true;
++
++ int y1 = h/2;
++ int y2 = y1+ 1;
++ QRgb565* pixel1 = (QRgb565*)(buffer.scanLine(y1)) + x;
++ QRgb565* pixel2 = (QRgb565*)(buffer.scanLine(y2)) + x;
++ int pixelstep = pixel2 - pixel1;
++
++ #ifdef PICTUREFLOW_BILINEAR_FILTER
++ int center = (sh*BILINEAR_STRETCH_VER/2);
++ int dy = dist*BILINEAR_STRETCH_VER / h;
++ #else
++ int center = (sh/2);
++ int dy = dist / h;
++ #endif
++ int p1 = center*PFREAL_ONE - dy/2;
++ int p2 = center*PFREAL_ONE + dy/2;
++
++ const QRgb565 *ptr = (const QRgb565*)(src->scanLine(column));
++ if(alpha == 256)
++ while((y1 >= 0) && (y2 < h) && (p1 >= 0))
++ {
++ *pixel1 = ptr[p1 >> PFREAL_SHIFT];
++ *pixel2 = ptr[p2 >> PFREAL_SHIFT];
++ p1 -= dy;
++ p2 += dy;
++ y1--;
++ y2++;
++ pixel1 -= pixelstep;
++ pixel2 += pixelstep;
++ }
++ else
++ while((y1 >= 0) && (y2 < h) && (p1 >= 0))
++ {
++ QRgb565 c1 = ptr[p1 >> PFREAL_SHIFT];
++ QRgb565 c2 = ptr[p2 >> PFREAL_SHIFT];
++
++ *pixel1 = BYTE_MUL_RGB16(c1, alpha);
++ *pixel2 = BYTE_MUL_RGB16(c2, alpha);
++
++ /*
++ int r1 = qRed(c1) * alpha/256;
++ int g1 = qGreen(c1) * alpha/256;
++ int b1 = qBlue(c1) * alpha/256;
++ int r2 = qRed(c2) * alpha/256;
++ int g2 = qGreen(c2) * alpha/256;
++ int b2 = qBlue(c2) * alpha/256;
++ *pixel1 = qRgb(r1, g1, b1);
++ *pixel2 = qRgb(r2, g2, b2);
++ */
++ p1 -= dy;
++ p2 += dy;
++ y1--;
++ y2++;
++ pixel1 -= pixelstep;
++ pixel2 += pixelstep;
++ }
++ }
++
++ rect.setTop(0);
++ rect.setBottom(h-1);
++ return rect;
++ }
++
++ // Updates look-up table and other stuff necessary for the rendering.
++ // Call this when the viewport size or slide dimension is changed.
++ void PictureFlowPrivate::recalc(int ww, int wh)
++ {
++ int w = (ww+1)/2;
++ int h = (wh+1)/2;
++ buffer = QImage(ww, wh, QImage::Format_RGB16);
++ buffer.fill(0);
++
++ rays.resize(w*2);
++
++ for(int i = 0; i < w; i++)
++ {
++ PFreal gg = (PFREAL_HALF + i * PFREAL_ONE) / (2*h);
++ rays[w-i-1] = -gg;
++ rays[w+i] = gg;
++ }
++
++ // pointer must move more than 1/15 of the window to enter drag mode
++ singlePressThreshold = ww / 15;
++ // qDebug() << "singlePressThreshold now set to " << singlePressThreshold;
++
++ pixelsToMovePerSlide = ww / 3;
++ // qDebug() << "pixelsToMovePerSlide now set to " << pixelsToMovePerSlide;
++
++ itilt = 80 * IANGLE_MAX / 360; // approx. 80 degrees tilted
++
++ offsetY = slideWidth/2 * fsin(itilt);
++ offsetY += slideWidth * PFREAL_ONE / 4;
++
++ // offsetX = slideWidth/2 * (PFREAL_ONE-fcos(itilt));
++ // offsetX += slideWidth * PFREAL_ONE;
++
++ // center slide + side slide
++ offsetX = slideWidth*PFREAL_ONE;
++ // offsetX = 150*PFREAL_ONE;//(slideWidth/2)*PFREAL_ONE + ( slideWidth*fcos(itilt) )/2;
++ // qDebug() << "center width = " << slideWidth;
++ // qDebug() << "side width = " << fixedToFloat(slideWidth/2 * (PFREAL_ONE-fcos(itilt)));
++ // qDebug() << "offsetX now " << fixedToFloat(offsetX);
++
++ spacing = slideWidth/5;
++
++ surfaceCache.clear();
++ blankSurface = QImage();
++ }
++
++ void PictureFlowPrivate::startAnimation()
++ {
++ if(!animateTimer.isActive())
++ {
++ step = (target < centerSlide.slideIndex) ? -1 : 1;
++ animateTimer.start(30, widget);
++ }
++ }
++
++ // Updates the animation effect. Call this periodically from a timer.
++ void PictureFlowPrivate::updateAnimation()
++ {
++ if(!animateTimer.isActive())
++ return;
++ if(step == 0)
++ return;
++
++ int speed = 16384;
++
++ // deaccelerate when approaching the target
++ if(true)
++ {
++ const int max = 2 * 65536;
++
++ int fi = slideFrame;
++ fi -= (target << 16);
++ if(fi < 0)
++ fi = -fi;
++ fi = qMin(fi, max);
++
++ int ia = IANGLE_MAX * (fi-max/2) / (max*2);
++ speed = 512 + 16384 * (PFREAL_ONE+fsin(ia))/PFREAL_ONE;
++ }
++
++ slideFrame += speed*step;
++
++ int index = slideFrame >> 16;
++ int pos = slideFrame & 0xffff;
++ int neg = 65536 - pos;
++ int tick = (step < 0) ? neg : pos;
++ PFreal ftick = (tick * PFREAL_ONE) >> 16;
++
++ // the leftmost and rightmost slide must fade away
++ fade = pos / 256;
++
++ if(step < 0)
++ index++;
++ if(centerIndex != index)
++ {
++ centerIndex = index;
++ slideFrame = index << 16;
++ centerSlide.slideIndex = centerIndex;
++ for(int i = 0; i < leftSlides.count(); i++)
++ leftSlides[i].slideIndex = centerIndex-1-i;
++ for(int i = 0; i < rightSlides.count(); i++)
++ rightSlides[i].slideIndex = centerIndex+1+i;
++ }
++
++ centerSlide.angle = (step * tick * itilt) >> 16;
++ centerSlide.cx = -step * fmul(offsetX, ftick);
++ centerSlide.cy = fmul(offsetY, ftick);
++
++ if(centerIndex == target)
++ {
++ resetSlides();
++ animateTimer.stop();
++ triggerRender();
++ step = 0;
++ fade = 256;
++ return;
++ }
++
++ for(int i = 0; i < leftSlides.count(); i++)
++ {
++ SlideInfo& si = leftSlides[i];
++ si.angle = itilt;
++ si.cx = -(offsetX + spacing*i*PFREAL_ONE + step*spacing*ftick);
++ si.cy = offsetY;
++ }
++
++ for(int i = 0; i < rightSlides.count(); i++)
++ {
++ SlideInfo& si = rightSlides[i];
++ si.angle = -itilt;
++ si.cx = offsetX + spacing*i*PFREAL_ONE - step*spacing*ftick;
++ si.cy = offsetY;
++ }
++
++ if(step > 0)
++ {
++ PFreal ftick = (neg * PFREAL_ONE) >> 16;
++ rightSlides[0].angle = -(neg * itilt) >> 16;
++ rightSlides[0].cx = fmul(offsetX, ftick);
++ rightSlides[0].cy = fmul(offsetY, ftick);
++ }
++ else
++ {
++ PFreal ftick = (pos * PFREAL_ONE) >> 16;
++ leftSlides[0].angle = (pos * itilt) >> 16;
++ leftSlides[0].cx = -fmul(offsetX, ftick);
++ leftSlides[0].cy = fmul(offsetY, ftick);
++ }
++
++ // must change direction ?
++ if(target < index) if(step > 0)
++ step = -1;
++ if(target > index) if(step < 0)
++ step = 1;
++
++ triggerRender();
++ }
++
++
++ void PictureFlowPrivate::clearSurfaceCache()
++ {
++ surfaceCache.clear();
++ }
++
++ // -----------------------------------------
++
++ PictureFlow::PictureFlow(QWidget* parent): QWidget(parent)
++ {
++ d = new PictureFlowPrivate(this);
++
++ setAttribute(Qt::WA_StaticContents, true);
++ setAttribute(Qt::WA_OpaquePaintEvent, true);
++ setAttribute(Qt::WA_NoSystemBackground, true);
++ }
++
++ PictureFlow::~PictureFlow()
++ {
++ delete d;
++ }
++
++ int PictureFlow::slideCount() const
++ {
++ return d->slideCount();
++ }
++
++ void PictureFlow::setSlideCount(int count)
++ {
++ d->setSlideCount(count);
++ }
++
++ QSize PictureFlow::slideSize() const
++ {
++ return d->slideSize();
++ }
++
++ void PictureFlow::setSlideSize(QSize size)
++ {
++ d->setSlideSize(size);
++ }
++
++ int PictureFlow::zoomFactor() const
++ {
++ return d->zoomFactor();
++ }
++
++ void PictureFlow::setZoomFactor(int z)
++ {
++ d->setZoomFactor(z);
++ }
++
++ QImage PictureFlow::slide(int index) const
++ {
++ return d->slide(index);
++ }
++
++ void PictureFlow::setSlide(int index, const QImage& image)
++ {
++ d->setSlide(index, image);
++ }
++
++ void PictureFlow::setSlide(int index, const QPixmap& pixmap)
++ {
++ d->setSlide(index, pixmap.toImage());
++ }
++
++ void PictureFlow::setSlideCaption(int index, QString caption)
++ {
++ d->captions[index] = caption;
++ }
++
++
++ int PictureFlow::currentSlide() const
++ {
++ return d->currentSlide();
++ }
++
++ void PictureFlow::setCurrentSlide(int index)
++ {
++ d->setCurrentSlide(index);
++ }
++
++ void PictureFlow::clear()
++ {
++ d->setSlideCount(0);
++ }
++
++ void PictureFlow::clearCaches()
++ {
++ d->clearSurfaceCache();
++ }
++
++ void PictureFlow::render()
++ {
++ d->render();
++ update();
++ }
++
++ void PictureFlow::showPrevious()
++ {
++ d->showPrevious();
++ }
++
++ void PictureFlow::showNext()
++ {
++ d->showNext();
++ }
++
++ void PictureFlow::showSlide(int index)
++ {
++ d->showSlide(index);
++ }
++
++ void PictureFlow::keyPressEvent(QKeyEvent* event)
++ {
++ if(event->key() == Qt::Key_Left)
++ {
++ if(event->modifiers() == Qt::ControlModifier)
++ showSlide(currentSlide()-10);
++ else
++ showPrevious();
++ event->accept();
++ return;
++ }
++
++ if(event->key() == Qt::Key_Right)
++ {
++ if(event->modifiers() == Qt::ControlModifier)
++ showSlide(currentSlide()+10);
++ else
++ showNext();
++ event->accept();
++ return;
++ }
++
++ if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Select) {
++ emit itemActivated(d->getTarget());
++ event->accept();
++ return;
++ }
++
++ event->ignore();
++ }
++
++ #define SPEED_LOWER_THRESHOLD 10
++ #define SPEED_UPPER_LIMIT 40
++
++ void PictureFlow::mouseMoveEvent(QMouseEvent* event)
++ {
++ int distanceMovedSinceLastEvent = event->position().toPoint().x() - d->previousPos.x();
++
++ // Check to see if we need to switch from single press mode to a drag mode
++ if (d->singlePress)
++ {
++ // Increment the distance moved for this event
++ d->pixelDistanceMoved += distanceMovedSinceLastEvent;
++
++ // Check against threshold
++ if (qAbs(d->pixelDistanceMoved) > d->singlePressThreshold)
++ {
++ d->singlePress = false;
++ // qDebug() << "DRAG MODE ON";
++ }
++ }
++
++ if (!d->singlePress)
++ {
++ int speed;
++ // Calculate velocity in a 10th of a window width per second
++ if (d->previousPosTimestamp.elapsed() == 0)
++ speed = SPEED_LOWER_THRESHOLD;
++ else
++ {
++ speed = ((qAbs(event->position().toPoint().x()-d->previousPos.x())*1000) / d->previousPosTimestamp.elapsed())
++ / (d->buffer.width() / 10);
++
++ if (speed < SPEED_LOWER_THRESHOLD)
++ speed = SPEED_LOWER_THRESHOLD;
++ else if (speed > SPEED_UPPER_LIMIT)
++ speed = SPEED_UPPER_LIMIT;
++ else {
++ speed = SPEED_LOWER_THRESHOLD + (speed / 3);
++ // qDebug() << "ACCELERATION ENABLED Speed = " << speed << ", Distance = " << distanceMovedSinceLastEvent;
++ }
++ }
++
++ // qDebug() << "Speed = " << speed;
++
++ // int incr = ((event->pos().x() - d->previousPos.x())/10) * speed;
++
++ // qDebug() << "Incremented by " << incr;
++
++ int incr = (distanceMovedSinceLastEvent * speed);
++
++ //qDebug() << "(distanceMovedSinceLastEvent * speed) = " << incr;
++
++ if (incr > d->pixelsToMovePerSlide*2) {
++ incr = d->pixelsToMovePerSlide*2;
++ //qDebug() << "Limiting incr to " << incr;
++ }
++
++
++ d->pixelDistanceMoved += (distanceMovedSinceLastEvent * speed);
++ // qDebug() << "distance: " << d->pixelDistanceMoved;
++
++ int slideInc;
++
++ slideInc = d->pixelDistanceMoved / (d->pixelsToMovePerSlide * 10);
++
++ if (slideInc != 0) {
++ int targetSlide = d->getTarget() - slideInc;
++ showSlide(targetSlide);
++ // qDebug() << "TargetSlide = " << targetSlide;
++
++ //qDebug() << "Decrementing pixelDistanceMoved by " << (d->pixelsToMovePerSlide *10) * slideInc;
++
++ d->pixelDistanceMoved -= (d->pixelsToMovePerSlide *10) * slideInc;
++
++ /*
++ if ( (targetSlide <= 0) || (targetSlide >= d->slideCount()-1) )
++ d->pixelDistanceMoved = 0;
++ */
++ }
++ }
++
++ d->previousPos = event->position().toPoint();
++ d->previousPosTimestamp.restart();
++
++ emit inputReceived();
++ }
++
++ void PictureFlow::mousePressEvent(QMouseEvent* event)
++ {
++ d->firstPress = event->position().toPoint();
++ d->previousPos = event->position().toPoint();
++ d->previousPosTimestamp.start();
++ d->singlePress = true; // Initially assume a single press
++ // d->dragStartSlide = d->getTarget();
++ d->pixelDistanceMoved = 0;
++
++ emit inputReceived();
++ }
++
++ void PictureFlow::mouseReleaseEvent(QMouseEvent* event)
++ {
++ int sideWidth = (d->buffer.width() - slideSize().width()) /2;
++
++ if (d->singlePress)
++ {
++ if (event->position().toPoint().x() < sideWidth )
++ {
++ showPrevious();
++ } else if ( event->position().toPoint().x() > sideWidth + slideSize().width() ) {
++ showNext();
++ } else {
++ emit itemActivated(d->getTarget());
++ }
++
++ event->accept();
++ }
++
++ emit inputReceived();
++ }
++
++
++ void PictureFlow::paintEvent(QPaintEvent* event)
++ {
++ Q_UNUSED(event);
++ QPainter painter(this);
++ painter.setRenderHint(QPainter::Antialiasing, false);
++ painter.drawImage(QPoint(0,0), d->buffer);
++ }
++
++ void PictureFlow::resizeEvent(QResizeEvent* event)
++ {
++ d->resize(width(), height());
++ QWidget::resizeEvent(event);
++ }
++
++ void PictureFlow::timerEvent(QTimerEvent* event)
++ {
++ if(event->timerId() == d->animateTimer.timerId())
++ {
++ // QElapsedTimer now; now.start();
++ d->updateAnimation();
++ // d->animateTimer.start(qMax(0, 30-now.elapsed() ), this);
++ }
++ else
++ QWidget::timerEvent(event);
++ }