Michaël Lemaire
7f798cbf3d
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@319 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
622 lines
15 KiB
C++
622 lines
15 KiB
C++
#include "basepreview.h"
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#include <math.h>
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#include <QVector>
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#include <QPainter>
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#include <QTimer>
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#include <QWheelEvent>
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/*************** PreviewChunk ***************/
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class PreviewChunk
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{
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public:
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PreviewChunk(BasePreview* preview, int xstart, int ystart, int xsize, int ysize)
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{
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_preview = preview;
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_xstart = xstart;
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_ystart = ystart;
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_xsize = xsize;
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_ysize = ysize;
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_need_render = true;
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_alive = true;
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}
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bool isFrom(BasePreview* preview)
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{
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return _preview == preview;
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}
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void interrupt()
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{
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_alive = false;
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}
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void update()
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{
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_need_render = true;
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}
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bool render()
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{
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bool changed = false;
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int revision;
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if (_need_render)
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{
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_need_render = false;
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if (!_preview->isVisible())
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{
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return false;
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}
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QImage pixbuf = _preview->startChunkTransaction(_xstart, _ystart, _xsize, _ysize, &revision);
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for (int x = 0; x < _xsize; x++)
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{
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for (int y = 0; y < _ysize; y++)
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{
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QRgb col = pixbuf.pixel(x, y);
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if (!_alive)
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{
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return false;
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}
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if (qAlpha(col) < 255)
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{
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QColor newcol = _preview->getPixelColor(_xstart + x, _ystart + y);
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newcol.setAlpha(255);
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pixbuf.setPixel(x, y, newcol.rgb());
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changed = true;
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}
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}
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}
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if (changed)
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{
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_preview->commitChunkTransaction(&pixbuf, _xstart, _ystart, _xsize, _ysize, revision);
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}
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}
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return changed;
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}
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private:
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BasePreview* _preview;
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bool _alive;
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bool _need_render;
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int _xstart;
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int _ystart;
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int _xsize;
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int _ysize;
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};
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static PreviewDrawingManager* _drawing_manager = NULL;
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/*************** PreviewDrawingThread ***************/
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PreviewDrawingThread::PreviewDrawingThread() :
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QThread()
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{
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_running = false;
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}
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void PreviewDrawingThread::askStop()
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{
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_running = false;
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}
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void PreviewDrawingThread::run()
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{
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_running = true;
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while (_running)
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{
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_drawing_manager->performOneThreadJob();
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QThread::usleep(5000);
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}
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}
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/*************** PreviewDrawingManager ***************/
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PreviewDrawingManager::PreviewDrawingManager()
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{
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_thread_count = QThread::idealThreadCount();
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if (_thread_count < 1)
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{
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_thread_count = 1;
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}
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}
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void PreviewDrawingManager::startThreads()
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{
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for (int i = 0; i < _thread_count; i++)
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{
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PreviewDrawingThread* thread = new PreviewDrawingThread();
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_threads.append(thread);
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thread->start();
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}
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}
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void PreviewDrawingManager::stopThreads()
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{
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for (int i = 0; i < _threads.size(); i++)
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{
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_threads.at(i)->askStop();
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}
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for (int i = 0; i < _chunks.size(); i++)
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{
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_chunks.at(i)->interrupt();
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}
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for (int i = 0; i < _threads.size(); i++)
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{
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_threads.at(i)->wait();
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}
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}
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void PreviewDrawingManager::addChunk(PreviewChunk* chunk)
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{
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_lock.lock();
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_chunks.append(chunk);
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_updateQueue.append(chunk);
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_lock.unlock();
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}
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void PreviewDrawingManager::removeChunks(BasePreview* preview)
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{
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for (int i = 0; i < _chunks.size(); i++)
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{
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PreviewChunk* chunk;
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chunk = _chunks.at(i);
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if (chunk->isFrom(preview))
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{
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_lock.lock();
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_chunks.remove(i);
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_updateQueue.removeAll(chunk);
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_lock.unlock();
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i--;
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}
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}
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}
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void PreviewDrawingManager::updateChunks(BasePreview* preview)
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{
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for (int i = 0; i < _chunks.size(); i++)
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{
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PreviewChunk* chunk;
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chunk = _chunks.at(i);
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if (chunk->isFrom(preview))
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{
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chunk->update();
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_lock.lock();
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if (!_updateQueue.contains(chunk))
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{
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_updateQueue.prepend(chunk);
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}
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_lock.unlock();
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}
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}
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}
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void PreviewDrawingManager::performOneThreadJob()
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{
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PreviewChunk* chunk;
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chunk = NULL;
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_lock.lock();
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if (!_updateQueue.isEmpty())
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{
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chunk = _updateQueue.takeFirst();
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}
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_lock.unlock();
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if (chunk)
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{
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chunk->render();
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}
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}
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/*************** BasePreview ***************/
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BasePreview::BasePreview(QWidget* parent) :
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QWidget(parent)
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{
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this->lock_drawing = new QMutex();
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this->conf_scroll_xmin = 0.0;
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this->conf_scroll_xmax = 0.0;
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this->conf_scroll_xinit = 0.0;
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this->conf_scroll_ymin = 0.0;
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this->conf_scroll_ymax = 0.0;
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this->conf_scroll_yinit = 0.0;
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this->conf_scale_min = 1.0;
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this->conf_scale_max = 1.0;
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this->conf_scale_init = 1.0;
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this->conf_scale_step = 0.0;
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this->conf_scroll_logarithmic = false;
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this->scaling = 1.0;
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this->scalingbase = 1.0;
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this->xoffset = 0.0;
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this->yoffset = 0.0;
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this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
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this->pixbuf->fill(0x00000000);
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_width = width();
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_height = height();
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_revision = 0;
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this->alive = true;
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QObject::connect(this, SIGNAL(contentChange()), this, SLOT(update()));
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QObject::connect(this, SIGNAL(redrawRequested()), this, SLOT(handleRedraw()));
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this->setMinimumSize(256, 256);
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this->setMaximumSize(256, 256);
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this->resize(256, 256);
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}
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BasePreview::~BasePreview()
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{
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alive = false;
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_drawing_manager->removeChunks(this);
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delete pixbuf;
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delete lock_drawing;
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}
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void BasePreview::initDrawers()
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{
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_drawing_manager = new PreviewDrawingManager();
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_drawing_manager->startThreads();
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}
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void BasePreview::stopDrawers()
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{
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_drawing_manager->stopThreads();
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}
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void BasePreview::updateData()
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{
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}
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QColor BasePreview::getColor(double x, double y)
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{
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return QColor(0, 0, 0);
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}
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void BasePreview::configScaling(double min, double max, double step, double init, bool logarithmic)
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{
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double size = (double) width();
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if (size >= 1.0)
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{
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conf_scale_min = min / size;
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conf_scale_max = max / size;
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conf_scale_step = step / size;
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conf_scale_init = init / size;
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conf_scroll_logarithmic = logarithmic;
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scalingbase = init / size;
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if (conf_scroll_logarithmic && conf_scale_max - conf_scale_min > 0.0000001)
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{
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scalingbase = pow((scalingbase - conf_scale_min) / (conf_scale_max - conf_scale_min), 0.5) * (conf_scale_max - conf_scale_min) + conf_scale_min;
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}
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updateScaling();
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redraw();
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}
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}
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void BasePreview::configScrolling(double xmin, double xmax, double xinit, double ymin, double ymax, double yinit)
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{
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conf_scroll_xmin = xmin;
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conf_scroll_xmax = xmax;
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conf_scroll_xinit = xinit;
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conf_scroll_ymin = ymin;
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conf_scroll_ymax = ymax;
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conf_scroll_yinit = yinit;
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xoffset = xinit;
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yoffset = yinit;
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redraw();
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}
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void BasePreview::redraw()
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{
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emit(redrawRequested());
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}
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QImage BasePreview::startChunkTransaction(int x, int y, int w, int h, int* revision)
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{
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*revision = _revision;
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return pixbuf->copy(x, y, w, h);
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}
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void BasePreview::commitChunkTransaction(QImage* chunk, int x, int y, int w, int h, int revision)
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{
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lock_drawing->lock();
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if (revision == _revision)
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{
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for (int ix = 0; ix < w; ix++)
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{
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for (int iy = 0; iy < h; iy++)
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{
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pixbuf->setPixel(x + ix, y + iy, chunk->pixel(ix, iy));
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}
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}
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emit contentChange();
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}
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lock_drawing->unlock();
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}
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QColor BasePreview::getPixelColor(int x, int y)
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{
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return getColor((double) (x - _width / 2) * scaling + xoffset, (double) (y - _height / 2) * scaling + yoffset);
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}
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void BasePreview::handleRedraw()
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{
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lock_drawing->lock();
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updateData();
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invalidatePixbuf(128);
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lock_drawing->unlock();
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}
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void BasePreview::showEvent(QShowEvent* event)
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{
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updateChunks();
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}
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void BasePreview::resizeEvent(QResizeEvent* event)
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{
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QImage* image;
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this->lock_drawing->lock();
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image = this->pixbuf;
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_width = event->size().width();
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_height = event->size().height();
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this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
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this->pixbuf->fill(0x00000000);
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_drawing_manager->removeChunks(this);
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for (int x = 0; x < _width; x += 32)
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{
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for (int y = 0; y < _height; y += 32)
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{
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_drawing_manager->addChunk(new PreviewChunk(this, x, y, x + 32 > _width ? _width - x : 32, y + 32 > _height ? _height - y : 32));
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}
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}
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delete image;
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this->lock_drawing->unlock();
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}
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void BasePreview::paintEvent(QPaintEvent* event)
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{
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QPainter painter(this);
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painter.drawImage(0, 0, *this->pixbuf);
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}
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void BasePreview::updateScaling()
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{
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if (conf_scroll_logarithmic && conf_scale_max - conf_scale_min > 0.0000001)
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{
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scaling = pow((scalingbase - conf_scale_min) / (conf_scale_max - conf_scale_min), 2.0) * (conf_scale_max - conf_scale_min) + conf_scale_min;
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}
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else
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{
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scaling = scalingbase;
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}
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}
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void BasePreview::updateChunks()
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{
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_drawing_manager->updateChunks(this);
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_revision++;
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}
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void BasePreview::invalidatePixbuf(int value)
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{
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for (int ix = 0; ix < _width; ix++)
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{
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for (int iy = 0; iy < _height; iy++)
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{
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QRgb col = pixbuf->pixel(ix, iy);
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if (qAlpha(col) == 255)
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{
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pixbuf->setPixel(ix, iy, qRgba(qRed(col), qGreen(col), qBlue(col), value));
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}
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}
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}
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updateChunks();
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}
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void BasePreview::mousePressEvent(QMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton)
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{
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mousex = event->x();
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mousey = event->y();
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}
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}
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void BasePreview::mouseMoveEvent(QMouseEvent* event)
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{
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int dx, dy;
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int ndx, ndy;
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int width, height;
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if (event->buttons() & Qt::LeftButton)
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{
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dx = event->x() - mousex;
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dy = event->y() - mousey;
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ndx = dx;
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ndy = dy;
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if (xoffset - dx * scaling > conf_scroll_xmax)
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{
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ndx = (int) floor((conf_scroll_xmax - xoffset) / scaling);
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}
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if (xoffset - dx * scaling < conf_scroll_xmin)
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{
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ndx = (int) floor((conf_scroll_xmin - xoffset) / scaling);
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}
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if (yoffset - dy * scaling > conf_scroll_ymax)
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{
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ndy = (int) floor((conf_scroll_ymax - yoffset) / scaling);
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}
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if (yoffset - dy * scaling < conf_scroll_ymin)
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{
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ndy = (int) floor((conf_scroll_ymin - yoffset) / scaling);
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}
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if (ndx != 0 || ndy != 0)
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{
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width = this->width();
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height = this->height();
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if (ndx <= -width || ndx >= width || ndy <= -height || ndy >= height)
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{
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xoffset -= (double) ndx * scaling;
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yoffset -= (double) ndy * scaling;
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lock_drawing->lock();
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pixbuf->fill(0x00000000);
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updateChunks();
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lock_drawing->unlock();
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}
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else
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{
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int xstart, xsize, ystart, ysize;
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lock_drawing->lock();
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xoffset -= (double) ndx * scaling;
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yoffset -= (double) ndy * scaling;
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if (ndx < 0)
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{
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xstart = -ndx;
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xsize = width + ndx;
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}
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else
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{
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xstart = 0;
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xsize = width - ndx;
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}
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if (ndy < 0)
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{
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ystart = -ndy;
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ysize = height + ndy;
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}
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else
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{
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ystart = 0;
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ysize = height - ndy;
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}
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QImage part = pixbuf->copy(xstart, ystart, xsize, ysize);
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pixbuf->fill(0x00000000);
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QPainter painter(pixbuf);
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painter.drawImage(xstart + ndx, ystart + ndy, part);
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updateChunks();
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lock_drawing->unlock();
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emit contentChange();
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}
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}
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mousex = event->x();
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mousey = event->y();
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}
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}
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void BasePreview::wheelEvent(QWheelEvent* event)
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{
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double factor;
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double old_scaling;
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int width, height;
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int new_width, new_height;
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if (event->modifiers() & Qt::ShiftModifier)
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{
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factor = 5.0;
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}
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else if (event->modifiers() & Qt::ControlModifier)
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{
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factor = 0.2;
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}
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else
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{
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factor = 1.0;
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}
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if (event->orientation() == Qt::Vertical)
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{
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if (event->delta() > 0 && scalingbase > conf_scale_min)
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{
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scalingbase -= factor * conf_scale_step;
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if (scalingbase < conf_scale_min)
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{
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scalingbase = conf_scale_min;
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}
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}
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else if (event->delta() < 0 && scalingbase < conf_scale_max)
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{
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scalingbase += factor * conf_scale_step;
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if (scalingbase > conf_scale_max)
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{
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scalingbase = conf_scale_max;
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}
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}
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else
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{
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event->ignore();
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return;
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}
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}
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else
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{
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event->ignore();
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return;
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}
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old_scaling = scaling;
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updateScaling();
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width = pixbuf->width();
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height = pixbuf->height();
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if (scaling < old_scaling)
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{
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lock_drawing->lock();
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new_width = (int) floor(((double) width) * scaling / old_scaling);
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new_height = (int) floor(((double) height) * scaling / old_scaling);
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QImage part = pixbuf->copy((width - new_width) / 2, (height - new_height) / 2, new_width, new_height).scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
|
|
pixbuf->fill(0x00000000);
|
|
QPainter painter(pixbuf);
|
|
painter.drawImage(0, 0, part);
|
|
invalidatePixbuf(254);
|
|
lock_drawing->unlock();
|
|
|
|
emit contentChange();
|
|
}
|
|
else if (scaling > old_scaling)
|
|
{
|
|
lock_drawing->lock();
|
|
QImage part = pixbuf->scaled((int) floor(((double) width) * old_scaling / scaling), (int) floor(((double) height) * old_scaling / scaling), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
|
|
pixbuf->fill(0x00000000);
|
|
QPainter painter(pixbuf);
|
|
painter.drawImage((width - part.width()) / 2, (height - part.height()) / 2, part);
|
|
invalidatePixbuf(254);
|
|
lock_drawing->unlock();
|
|
|
|
emit contentChange();
|
|
}
|
|
|
|
event->accept();
|
|
}
|