void
MaterialPreviewDialog::buildPreviewBitmap( const Ogre::String &texName )
{
const Ogre::uchar BytePerPixel = 8;
// 读取原始image
Ogre::Image *oriImage = getPreviewImage(texName);
// 源大纹理的大小
size_t oriImageHeight = oriImage->getHeight();
size_t oriImageWidth = oriImage->getWidth();
Ogre::uchar *oriImageData = oriImage->getData();
// 分配一个足够大的空间来保存新建的image的数据
size_t newImagegetRowSpan = oriImageWidth*oriImage->getBPP()/BytePerPixel; // 新建的image的行宽（单位为字节）
Ogre::uchar *newImageData = new Ogre::uchar[oriImageHeight*newImagegetRowSpan];
Ogre::uchar *newImageDataPointer = newImageData;
Ogre::uchar *oriImagedataPointer = oriImageData;
// 把所选的纹理的数据提取出来，并创建一个新的image
for ( Ogre::uint i=0; i<oriImageHeight; ++i )
{
memcpy(newImageDataPointer, oriImagedataPointer, newImagegetRowSpan);
newImageDataPointer += newImagegetRowSpan;
oriImagedataPointer += oriImage->getRowSpan();
}
Ogre::Image newImage;
newImage.loadDynamicImage(newImageData,oriImageWidth,oriImageHeight,1,oriImage->getFormat(),true);
// 如果所选纹理大于64*64，就先resize
if ( oriImageWidth > mPreviewImageWidth || oriImageHeight > mPreviewImageHeight )
newImage.resize(mPreviewImageWidth, mPreviewImageHeight);
// 如果有alpha，要与黑白图进行混合
if ( newImage.getHasAlpha() )
{
Ogre::uchar *tempPtr = newImage.getData();
assert (tempPtr);
for ( size_t i=0; i<mPreviewImageHeight; ++i )
for ( size_t j=0; j<mPreviewImageWidth; ++j )
{
// 取出alpha值
float alphaValue = (float)tempPtr[3] / 255.0f;
// 计算出经过alpha混合后的颜色值
unsigned char r = tempPtr[2] * alphaValue;
unsigned char g = tempPtr[1] * alphaValue;
unsigned char b = tempPtr[0] * alphaValue;
// 设置到image中
mCurrentPreviewImage.SetRGB(j,i,r,g,b);
tempPtr += 4;
}
// 要把指针移回到图片数据的
tempPtr -= mPreviewImageHeight * mPreviewImageWidth * 4;
// 设置到缩略图控件中
}
// 没有alpha，就直接拷贝数据
else
{
memcpy ( mCurrentPreviewImage.GetData(), newImage.getData(), newImage.getSize() );
}
}
void
BrushSelector::buildPreviewBitmap( const Fairy::TextureInfo texInfo )
{
const Ogre::uchar BytePerPixel = 8;
// 读取原始image
Ogre::Image *oriImage = GetSceneManipulator()->getPreviewImage(texInfo.ownerTextureName);
// 源大纹理的大小
size_t oriImageHeight = oriImage->getHeight();
size_t oriImageWidth = oriImage->getWidth();
Ogre::uchar *oriImageData = oriImage->getData();
// 所选纹理的大小
size_t newImageWidth = texInfo.width*TexTileSize;
size_t newImageHeight = texInfo.height*TexTileSize;
// 分配一个足够大的空间来保存新建的image的数据
size_t newImagegetRowSpan = newImageWidth*oriImage->getBPP()/BytePerPixel; // 新建的image的行宽（单位为字节）
Ogre::uchar *newImageData = OGRE_ALLOC_T(Ogre::uchar, oriImageHeight*newImagegetRowSpan, Ogre::MEMCATEGORY_GENERAL);//new Ogre::uchar[newImageHeight*newImagegetRowSpan];
Ogre::uchar *newImageDataPointer = newImageData;
// 得知起始像素点
size_t startPoint = ( oriImageWidth * texInfo.topCorner + texInfo.leftCorner )
* TexTileSize * oriImage->getBPP()/BytePerPixel;
Ogre::uchar *oriImagedataPointer = oriImageData + startPoint;
// 把所选的纹理的数据提取出来，并创建一个新的image
for ( Ogre::uint i=0; i<newImageHeight; ++i )
{
memcpy(newImageDataPointer, oriImagedataPointer, newImagegetRowSpan);
newImageDataPointer += newImagegetRowSpan;
oriImagedataPointer += oriImage->getRowSpan();
}
Ogre::Image newImage;
newImage.loadDynamicImage(newImageData,newImageWidth,newImageHeight,1,oriImage->getFormat(),true);
// 如果所选纹理大于64*64，就先resize
if ( texInfo.width > 1 || texInfo.height > 1 )
newImage.resize(mPreviewImageWidth, mPreviewImageHeight);
// 如果有alpha，要与黑白图进行混合
if ( newImage.getHasAlpha() )
{
Ogre::ColourValue col;
for ( int i=0; i<mPreviewImageWidth; ++i )
{
for ( int j=0; j<mPreviewImageWidth; ++j )
{
col = newImage.getColourAt(j,i,0);
float alphaValue = col.a;
unsigned char r = col.r*255 * alphaValue + mBlackWhitePreviewImage.GetRed(i,j) * ( 1.0f - alphaValue);
unsigned char g = col.g*255 * alphaValue + mBlackWhitePreviewImage.GetGreen(i,j) * ( 1.0f - alphaValue);
unsigned char b = col.b*255 * alphaValue + mBlackWhitePreviewImage.GetBlue(i,j) * ( 1.0f - alphaValue);
// 设置到image中
mCurrentPreviewImage.SetRGB(j,i,r,g,b);
}
}
// 设置到缩略图控件中
mBrushesPreview->SetBitmap(mCurrentPreviewImage);
}
// 没有alpha，就直接拷贝数据
else
{
Ogre::ColourValue col;
for ( int i=0; i<mPreviewImageWidth; ++i )
{
for ( int j=0; j<mPreviewImageWidth; ++j )
{
col = newImage.getColourAt(j,i,0);
unsigned char r = col.r*255;
unsigned char g = col.g*255;
unsigned char b = col.b*255;
// 设置到image中
mCurrentPreviewImage.SetRGB(j,i,r,g,b);
}
}
mBrushesPreview->SetBitmap(mCurrentPreviewImage);
}
}
void
MaterialPreviewDialog::buildPreviewBitmap( const Ogre::String &texName )
{
const Ogre::uchar BytePerPixel = 8;
// 读取原始image
Ogre::Image *oriImage = getPreviewImage(texName);
// 源大纹理的大小
size_t oriImageHeight = oriImage->getHeight();
size_t oriImageWidth = oriImage->getWidth();
Ogre::uchar *oriImageData = oriImage->getData();
// 分配一个足够大的空间来保存新建的image的数据
size_t newImagegetRowSpan = oriImageWidth*oriImage->getBPP()/BytePerPixel; // 新建的image的行宽（单位为字节）
Ogre::uchar *newImageData = OGRE_ALLOC_T(Ogre::uchar, oriImageHeight*newImagegetRowSpan, Ogre::MEMCATEGORY_GENERAL);//new Ogre::uchar[oriImageHeight*newImagegetRowSpan];
Ogre::uchar *newImageDataPointer = newImageData;
Ogre::uchar *oriImagedataPointer = oriImageData;
// 把所选的纹理的数据提取出来，并创建一个新的image
for ( Ogre::uint i=0; i<oriImageHeight; ++i )
{
memcpy(newImageDataPointer, oriImagedataPointer, newImagegetRowSpan);
newImageDataPointer += newImagegetRowSpan;
oriImagedataPointer += oriImage->getRowSpan();
}
Ogre::Image newImage;
newImage.loadDynamicImage(newImageData,oriImageWidth,oriImageHeight,1,oriImage->getFormat(),true);
// 如果所选纹理大于64*64，就先resize
if ( oriImageWidth > mPreviewImageWidth || oriImageHeight > mPreviewImageHeight )
newImage.resize(mPreviewImageWidth, mPreviewImageHeight);
// 如果有alpha，要与黑白图进行混合
if ( newImage.getHasAlpha() )
{
Ogre::ColourValue col;
for ( int i=0; i<mPreviewImageWidth; ++i )
{
for ( int j=0; j<mPreviewImageWidth; ++j )
{
col = newImage.getColourAt(j,i,0);
float alphaValue = col.a;
unsigned char r = col.r*255 * alphaValue;
unsigned char g = col.g*255 * alphaValue;
unsigned char b = col.b*255 * alphaValue;
// 设置到image中
mCurrentPreviewImage.SetRGB(j,i,r,g,b);
}
}
}
// 没有alpha，就直接拷贝数据
else
{
Ogre::ColourValue col;
for ( int i=0; i<mPreviewImageWidth; ++i )
{
for ( int j=0; j<mPreviewImageWidth; ++j )
{
col = newImage.getColourAt(j,i,0);
unsigned char r = col.r*255;
unsigned char g = col.g*255;
unsigned char b = col.b*255;
// 设置到image中
mCurrentPreviewImage.SetRGB(j,i,r,g,b);
}
}
}
}