paysages3d/gui_qt/preview.cpp

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#include "preview.h"
#include <QVector>
#include <QPainter>
#include <QTimer>
class PreviewDrawer:public QThread
{
public:
PreviewDrawer(Preview* preview):
QThread(),
_preview(preview)
{
_running = false;
}
void askStop()
{
_running = false;
}
protected:
void run()
{
_running = true;
while (_running)
{
_preview->doRender();
QThread::usleep(50000);
}
}
private:
Preview* _preview;
bool _running;
};
Preview::Preview(QWidget* parent) :
QWidget(parent)
{
this->lock_drawing = new QMutex();
this->conf_scroll_xmin = 0.0;
this->conf_scroll_xmax = 0.0;
this->conf_scroll_ymin = 0.0;
this->conf_scroll_ymax = 0.0;
this->conf_scale_min = 1.0;
this->conf_scale_max = 1.0;
this->conf_scale_step = 0.0;
this->scaling = 1.0;
this->xoffset = 0.0;
this->yoffset = 0.0;
this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
this->pixbuf->fill(0x00000000);
this->alive = true;
this->need_rerender = false;
this->need_render = true;
this->setMinimumSize(256, 256);
this->setMaximumSize(256, 256);
this->resize(256, 256);
QObject::connect(this, SIGNAL(contentChange()), this, SLOT(update()));
QObject::connect(this, SIGNAL(redrawRequested()), this, SLOT(handleRedraw()));
this->updater = new PreviewDrawer(this);
this->updater->start();
}
Preview::~Preview()
{
alive = false;
((PreviewDrawer*)updater)->askStop();
updater->wait();
delete updater;
delete pixbuf;
delete lock_drawing;;}
void Preview::updateData()
{
}
QColor Preview::getColor(double x, double y)
{
return QColor(0, 0, 0);
}
void Preview::doRender()
{
if (this->alive)
{
if (this->need_rerender)
{
this->forceRender();
}
if (this->need_render)
{
this->need_render = false;
this->renderPixbuf();
}
}
}
void Preview::redraw()
{
emit(redrawRequested());
}
void Preview::handleRedraw()
{
need_rerender = true;
lock_drawing->lock();
updateData();
need_rerender = true;
lock_drawing->unlock();
}
void Preview::setScaling(double scaling)
{
// TODO Follow conf_scale
this->scaling = scaling;
redraw();
}
void Preview::resizeEvent(QResizeEvent* event)
{
QImage* image;
this->lock_drawing->lock();
image = this->pixbuf;
this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
this->pixbuf->fill(0x00000000);
this->need_rerender = true;
this->need_render = true;
delete image;
this->lock_drawing->unlock();
}
void Preview::paintEvent(QPaintEvent* event)
{
QPainter painter(this);
painter.drawImage(0, 0, *this->pixbuf);
}
void Preview::forceRender()
{
this->lock_drawing->lock();
this->pixbuf->fill(0x00000000);
this->need_rerender = false;
this->need_render = true;
this->lock_drawing->unlock();
}
void Preview::renderPixbuf()
{
QColor col;
bool done;
int x, y, w, h;
w = this->pixbuf->width();
h = this->pixbuf->height();
for (x = 0; x < w; x++)
{
this->lock_drawing->lock();
if (this->need_rerender || !this->alive)
{
this->lock_drawing->unlock();
return;
}
done = false;
for (y = 0; y < h; y++)
{
if (this->need_rerender || !this->alive)
{
this->lock_drawing->unlock();
return;
}
if (qAlpha(this->pixbuf->pixel(x, y)) == 0)
{
col = this->getColor((double)(x - w / 2) * this->scaling + this->xoffset, (double)(y - h / 2) * this->scaling + this->yoffset);
this->pixbuf->setPixel(x, y, col.rgb());
done = true;
}
}
if (done && (x == w - 1 || x % 10 == 0))
{
emit contentChange();
}
this->lock_drawing->unlock();
}
}
//static void _scrollPixbuf(SmallPreview* preview, int dx, int dy)
//{
// int xstart, ystart, xsize, ysize, y;
// void* pixels = gdk_pixbuf_get_pixels(preview->pixbuf);
// int rowstride = gdk_pixbuf_get_rowstride(preview->pixbuf);
// preview->xoffset -= (double)dx * preview->scaling;
// preview->yoffset -= (double)dy * preview->scaling;
// /* TODO Use pixbuf size */
// if (dx == 0 && dy == 0)
// {
// return;
// }
// else if (dx <= -256 || dx >= 256 || dy <= -256 || dy >= 256)
// {
// _forceRender(preview);
// }
// else
// {
// if (dx < 0)
// {
// xstart = -dx;
// xsize = 256 + dx;
// }
// else
// {
// xstart = 0;
// xsize = 256 - dx;
// }
// if (dy < 0)
// {
// ystart = -dy;
// ysize = 256 + dy;
// }
// else
// {
// ystart = 0;
// ysize = 256 - dy;
// }
// memmove(pixels + (ystart + dy) * rowstride + (xstart + dx) * 4, pixels + ystart * rowstride + xstart * 4, (ysize - 1) * rowstride + xsize * 4);
// if (dy < 0)
// {
// memset(pixels + (256 + dy) * rowstride, 0, (-dy - 1) * rowstride + 256 * 4);
// }
// else if (dy > 0)
// {
// memset(pixels, 0, (dy - 1) * rowstride + 256 * 4);
// }
// if (dx < 0)
// {
// for (y = ystart + dy; y < ystart + dy + ysize; y++)
// {
// memset(pixels + y * rowstride + xsize * 4, 0, -dx * 4);
// }
// }
// else if (dx > 0)
// {
// for (y = ystart + dy; y < ystart + dy + ysize; y++)
// {
// memset(pixels + y * rowstride, 0, dx * 4);
// }
// }
// preview->need_render = 1;
// }
//}
//static inline int _fixScroll(SmallPreview* preview, int dx, int dy, int* new_dx, int* new_dy)
//{
// *new_dx = dx;
// *new_dy = dy;
// if (preview->xoffset - dx * preview->scaling > preview->conf_scroll_xmax)
// {
// *new_dx = (int)floor((preview->conf_scroll_xmax - preview->xoffset) / preview->scaling);
// }
// if (preview->xoffset - dx * preview->scaling < preview->conf_scroll_xmin)
// {
// *new_dx = (int)floor((preview->conf_scroll_xmin - preview->xoffset) / preview->scaling);
// }
// if (preview->yoffset - dy * preview->scaling > preview->conf_scroll_ymax)
// {
// *new_dy = (int)floor((preview->conf_scroll_ymax - preview->yoffset) / preview->scaling);
// }
// if (preview->yoffset - dy * preview->scaling < preview->conf_scroll_ymin)
// {
// *new_dy = (int)floor((preview->conf_scroll_ymin - preview->yoffset) / preview->scaling);
// }
// return (*new_dx == 0 && *new_dy == 0) ? 0 : 1;
//}
//static inline int _fixScaling(SmallPreview* preview, double scaling, double* new_scaling)
//{
// double old_scaling = preview->scaling;
// *new_scaling = scaling;
// if (scaling < preview->conf_scale_min)
// {
// *new_scaling = preview->conf_scale_min;
// }
// if (scaling > preview->conf_scale_max)
// {
// *new_scaling = preview->conf_scale_max;
// }
// return (old_scaling == *new_scaling) ? 0 : 1;
//}
//static int _cbMouseScroll(GtkEventBox* image, GdkEventScroll* event, gpointer data)
//{
// SmallPreview* preview = (SmallPreview*)data;
// /* TODO Center the zoom on the cursor */
// if (event->direction == GDK_SCROLL_UP)
// {
// mutexAcquire(preview->lock);
// if (_fixScaling(preview, preview->scaling - preview->conf_scale_step, &preview->scaling))
// {
// preview->need_rerender = 1;
// }
// mutexRelease(preview->lock);
// }
// else if (event->direction == GDK_SCROLL_DOWN)
// {
// mutexAcquire(preview->lock);
// if (_fixScaling(preview, preview->scaling + preview->conf_scale_step, &preview->scaling))
// {
// preview->need_rerender = 1;
// }
// mutexRelease(preview->lock);
// }
// return 1;
//}
//static int _cbMouseButtonPressed(GtkEventBox* image, GdkEventButton* event, gpointer data)
//{
// SmallPreview* preview = (SmallPreview*)data;
// if (event->button == 1)
// {
// preview->mousex = (int)event->x;
// preview->mousey = (int)event->y;
// }
// return 1;
//}
//static int _cbMouseMove(GtkEventBox* image, GdkEventMotion* event, gpointer data)
//{
// SmallPreview* preview = (SmallPreview*)data;
// int dx, dy;
// if (event->state & GDK_BUTTON1_MASK)
// {
// mutexAcquire(preview->lock);
// dx = (int)event->x - preview->mousex;
// dy = (int)event->y - preview->mousey;
// if (_fixScroll(preview, dx, dy, &dx, &dy))
// {
// _scrollPixbuf(preview, dx, dy);
// }
// preview->mousex = (int)event->x;
// preview->mousey = (int)event->y;
// mutexRelease(preview->lock);
// }
// return 1;
//}
//void guiPreviewRedrawAll()
//{
// int i;
// for (i = 0; i < _previews_count; i++)
// {
// guiPreviewRedraw(_preview + i);
// }
//}
//void guiPreviewConfigScrolling(SmallPreview* preview, double xmin, double xmax, double ymin, double ymax)
//{
// mutexAcquire(preview->lock);
// preview->conf_scroll_xmin = xmin;
// preview->conf_scroll_xmax = xmax;
// preview->conf_scroll_ymin = ymin;
// preview->conf_scroll_ymax = ymax;
// preview->need_rerender = 1;
// mutexRelease(preview->lock);
//}
//void guiPreviewConfigScaling(SmallPreview* preview, double min, double max, double step)
//{
// mutexAcquire(preview->lock);
// preview->conf_scale_min = min;
// preview->conf_scale_max = max;
// preview->conf_scale_step = step;
// preview->need_rerender = 1;
// mutexRelease(preview->lock);
//}
//void guiPreviewSetRenderer(SmallPreview* preview, SmallPreviewCallback renderer)
//{
// mutexAcquire(preview->lock);
// preview->renderer = renderer;
// preview->need_rerender = 1;
// mutexRelease(preview->lock);
//}
//void guiPreviewSetViewport(SmallPreview* preview, double xoffset, double yoffset, double scaling)
//{
// mutexAcquire(preview->lock);
// preview->xoffset = xoffset;
// preview->yoffset = yoffset;
// preview->scaling = scaling;
// preview->need_rerender = 1;
// mutexRelease(preview->lock);
//}
//void guiPreviewSetTerrainHeight(SmallPreview* preview)
//{
// /*preview->conf_scroll_x = 1;
// preview->conf_scroll_y = 1;
// preview->conf_zoom = 1;
// preview->init_scaling = preview->scaling = 0.1;
// preview->init_xoffset = preview->xoffset = 0.0;
// preview->init_yoffset = preview->yoffset = 0.0;
// preview->renderer = _renderTopDownHeight;*/
// guiPreviewRedraw(preview);
//}