void TileRenderer::Compose(std::string compositionLayerPath, std::string compositionMode, double compositionAlpha, int width, int height, mapnik::image_32* buf,int zz, int xx, int yy)
#endif
{
std::string compositionTilePath = "";
// COMPOSITION MODE
if(compositionLayerPath != "")
{
//std::stringstream str;
//str<< compositionLayerPath << "/tiles/" << zoom << "/" << x << "/" << y << ".png";
ImageObject compImg;
// find possible composition
int compositionLevel = 1;
double modX = 1;
double modY = 1;
if(compositionLayerPath != "")
{
for(size_t h = zz; h > 0; h--)
{
std::stringstream ss;
ss << compositionLayerPath << h << "/" << (math::Floor((double)xx/(compositionLevel > 0? compositionLevel:1))) << "/" << (math::Floor((double)yy/(compositionLevel > 0? compositionLevel:1))) << ".png";
if(FileSystem::FileExists(ss.str()))
{
compositionTilePath = ss.str();
double dx = ((double)xx/compositionLevel);
double dy = ((double)yy/compositionLevel);
int ix = int(math::Floor(dx));
int iy = int(math::Floor(dy));
modX = dx - ix;
modY = dy - iy;
break;
}
compositionLevel *= 2;
}
}
if(ImageLoader::LoadFromDisk(Img::Format_PNG, compositionTilePath, Img::PixelFormat_RGBA,compImg))
{
if(compositionMode == "unify" || compositionMode == "unifyopaque")
{
for(size_t y = 0; y < height; y++)
{
for(size_t x = 0; x < width; x++)
{
unsigned char comp[4];
int adr = 4*y*width+4*x;
if(compositionLevel > 0)
{
double pX = ((double)x/compositionLevel)+(modX*width);
double pY = ((double)y/compositionLevel)+(modY*height);
compImg.ReadPixelBilinear4(pX,pY,comp[0],comp[1],comp[2],comp[3]);
}
else
{
compImg.ReadPixel4(x,y,comp[0],comp[1],comp[2],comp[3]);
}
unsigned int compInt = 0x00000000;
compInt = compInt | comp[3];
compInt = (compInt << 8) | comp[2];
compInt = (compInt << 8) | comp[1];
compInt = (compInt << 8) | comp[0];
unsigned char alpha;
if(compositionMode == "unifyopaque")
{
alpha = buf->raw_data()[adr+3] > 0 ? 255 : 0;
}
else
{
alpha = buf->raw_data()[adr+3];
}
//buf.setPixel(x,y,compInt);
buf->blendPixel(x,y,compInt,(int)alpha);
}
}
}
else if(compositionMode == "overlay")
{
for(size_t y = 0; y < height; y++)
{
for(size_t x = 0; x < width; x++)
{
unsigned char comp[4];
int adr = 4*y*width+4*x;
if(compositionLevel > 0)
{
int pX = (x/compositionLevel)+(modX*width);
int pY = (y/compositionLevel)+(modY*height);
compImg.ReadPixelBilinear4(pX,pY,comp[0],comp[1],comp[2],comp[3]);
}
else
{
compImg.ReadPixel4(x,y,comp[0],comp[1],comp[2],comp[3]);
}
unsigned int compInt = 0x00000000;
compInt = compInt | comp[3];
compInt = (compInt << 8) | comp[2];
compInt = (compInt << 8) | comp[1];
compInt = (compInt << 8) | comp[0];
unsigned char alpha = buf->raw_data()[adr+3];
//buf.setPixel(x,y,compInt);
buf->blendPixel(x,y,compInt,(int)comp[3]);
}
}
}
}
}
}
