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fixed: reading tiled and stripped TIFFs

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This commit is contained in:
Artem Pavlenko 2005-02-27 14:40:51 +00:00
parent df045e7104
commit 4bffcae79d
1 changed files with 35 additions and 23 deletions
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58
src/tiff_reader.cc
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@ -157,7 +157,7 @@ namespace mapnik
TIFF* tif = TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
//todo
std::cerr<<"TODO:tiff is not stripped or tiled\n";
TIFFClose(tif);
}
}
@ -165,7 +165,6 @@ namespace mapnik
void TiffReader::read_tiled(unsigned x0,unsigned y0,ImageData32& image)
{
TIFF* tif=TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
@ -175,28 +174,33 @@ namespace mapnik
int start_y=(y0/tile_height_)*tile_height_;
int end_y=((y0+height)/tile_height_+1)*tile_height_;
bool bottomtiles=((unsigned)end_y > height_)?true:false;
int start_x=(x0/tile_width_)*tile_width_;
int end_x=((x0+width)/tile_width_+1)*tile_width_;
int row=0;
int tx0,tx1,ty0,ty1;
int row,tx0,tx1,ty0,ty1;
for (int y=start_y;y<end_y;y+=tile_height_)
{
ty0=std::max(y0,(unsigned)y)-y;
ty1=std::min(height+y0,(unsigned)(y+tile_height_))-y;
int n0=bottomtiles ? 0:(tile_height_-ty1);
int n1=bottomtiles ? (ty1-ty0-1):(tile_height_-ty0-1);
for (int x=start_x;x<end_x;x+=tile_width_)
{
if (!TIFFReadRGBATile(tif,x,y,buf)) break;
tx0=std::max(x0,(unsigned)x)-x;
tx1=std::min(width+x0,(unsigned)(x+tile_width_))-x;
tx0=std::max(x0,(unsigned)x);
tx1=std::min(width+x0,(unsigned)(x+tile_width_));
row=y+ty0-y0;
for (int n=tile_height_-ty0-1;n>=tile_height_-ty1;--n)
for (int n=n1;n>=n0;--n)
{
image.setRow(row,x+tx0-x0,x+tx1-x0,(const unsigned*)&buf[n*tile_width_+tx0]);
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*tile_width_+tx0-x]);
++row;
}
}
@ -207,31 +211,39 @@ namespace mapnik
}
void TiffReader::read_stripped(unsigned x,unsigned y,ImageData32& image)
void TiffReader::read_stripped(unsigned x0,unsigned y0,ImageData32& image)
{
TIFF* tif = TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(width_*rows_per_strip_*sizeof(uint32));
int width=image.width();
int height=image.height();
int start=(y/rows_per_strip_)*rows_per_strip_;
int end=((y+height)/rows_per_strip_+1)*rows_per_strip_;
int extra=y%rows_per_strip_;
int j=-extra;
int w=std::min(width_,(unsigned)width);//todo should be unsigned
for (int row=start; row < end; row+=rows_per_strip_)
int start_y=(y0/rows_per_strip_)*rows_per_strip_;
int end_y=((y0+height)/rows_per_strip_+1)*rows_per_strip_;
bool laststrip=((unsigned)end_y > height_)?true:false;
int row,tx0,tx1,ty0,ty1;
tx0=x0;
tx1=std::min(width+x0,(unsigned)width_);
for (unsigned y=start_y; y < end_y; y+=rows_per_strip_)
{
if (!TIFFReadRGBAStrip(tif,row,buf)) break;
for (int i=rows_per_strip_-1;i>=0;--i)
ty0=std::max(y0,y)-y;
ty1=std::min(height+y0,y+rows_per_strip_)-y;
memset(buf,0xff,width_*rows_per_strip_*sizeof(uint32));
if (!TIFFReadRGBAStrip(tif,y,buf)) break;
row=y+ty0-y0;
int n0=laststrip ? 0:(rows_per_strip_-ty1);
int n1=laststrip ? (ty1-ty0-1):(rows_per_strip_-ty0-1);
for (int n=n1;n>=n0;--n)
{
if (j>=0 && j<height)
{
image.setRow(j,(const unsigned*)&buf[i*width_+x],
w*sizeof(uint32));
}
++j;
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*width_+tx0]);
++row;
}
}
_TIFFfree(buf);