irrlicht/source/Irrlicht/CGUIImageList.cpp

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// This file is part of the "Irrlicht Engine".
// written by Reinhard Ostermeier, reinhard@nospam.r-ostermeier.de
// modified by Thomas Alten
#include "CGUIImageList.h"
namespace irr
{
namespace gui
{
//! constructor
CGUIImageList::CGUIImageList(video::IVideoDriver *driver) :
Driver(driver),
Texture(0),
ImageCount(0),
ImageSize(0, 0),
ImagesPerRow(0),
UseAlphaChannel(false)
{
#ifdef _DEBUG
setDebugName("CGUIImageList");
#endif
if (Driver) {
Driver->grab();
}
}
//! destructor
CGUIImageList::~CGUIImageList()
{
if (Driver) {
Driver->drop();
}
if (Texture) {
Texture->drop();
}
}
//! Creates the image list from texture.
bool CGUIImageList::createImageList(video::ITexture *texture,
core::dimension2d<s32> imageSize,
bool useAlphaChannel)
{
if (!texture) {
return false;
}
Texture = texture;
Texture->grab();
ImageSize = imageSize;
ImagesPerRow = Texture->getSize().Width / ImageSize.Width;
ImageCount = ImagesPerRow * Texture->getSize().Height / ImageSize.Height;
UseAlphaChannel = useAlphaChannel;
return true;
}
//! Draws an image and clips it to the specified rectangle if wanted
void CGUIImageList::draw(s32 index, const core::position2d<s32> &destPos,
const core::rect<s32> *clip /*= 0*/)
{
core::rect<s32> sourceRect;
if (!Driver || index < 0 || index >= ImageCount) {
return;
}
sourceRect.UpperLeftCorner.X = (index % ImagesPerRow) * ImageSize.Width;
sourceRect.UpperLeftCorner.Y = (index / ImagesPerRow) * ImageSize.Height;
sourceRect.LowerRightCorner.X = sourceRect.UpperLeftCorner.X + ImageSize.Width;
sourceRect.LowerRightCorner.Y = sourceRect.UpperLeftCorner.Y + ImageSize.Height;
Driver->draw2DImage(Texture, destPos, sourceRect, clip,
video::SColor(255, 255, 255, 255), UseAlphaChannel);
}
} // end namespace gui
} // end namespace irr