AuroraMiddleware/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

added support for loading images with alpha channel to TIFF handler

Browse Source 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47204 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík 2007-07-06 22:17:17 +00:00
parent 5c4ed98d99
commit b6ac40dc77
1 changed files with 27 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
src/common/imagtiff.cpp
View File

@ -267,6 +267,14 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
uint16 extraSamples;
uint16* samplesInfo;
TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
&extraSamples, &samplesInfo);
const bool hasAlpha = (extraSamples == 1 &&
(samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA ||
samplesInfo[0] == EXTRASAMPLE_UNASSALPHA));
npixels = w * h;
raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );
@ -293,6 +301,9 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
return false;
}
if ( hasAlpha )
image->SetAlpha();
if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
{
if (verbose)
@ -305,47 +316,38 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
return false;
}
bool hasmask = false;
unsigned char *ptr = image->GetData();
ptr += w*3*(h-1);
unsigned char *alpha = hasAlpha ? image->GetAlpha() : NULL;
if ( hasAlpha )
alpha += w*(h-1);
uint32 pos = 0;
for (uint32 i = 0; i < h; i++)
{
for (uint32 j = 0; j < w; j++)
{
unsigned char alpha = (unsigned char)TIFFGetA(raster[pos]);
if (alpha < 127)
{
hasmask = true;
ptr[0] = image->GetMaskRed();
ptr++;
ptr[0] = image->GetMaskGreen();
ptr++;
ptr[0] = image->GetMaskBlue();
ptr++;
}
else
{
ptr[0] = (unsigned char)TIFFGetR(raster[pos]);
ptr++;
ptr[0] = (unsigned char)TIFFGetG(raster[pos]);
ptr++;
ptr[0] = (unsigned char)TIFFGetB(raster[pos]);
ptr++;
}
*(ptr++) = (unsigned char)TIFFGetR(raster[pos]);
*(ptr++) = (unsigned char)TIFFGetG(raster[pos]);
*(ptr++) = (unsigned char)TIFFGetB(raster[pos]);
if ( hasAlpha )
*(alpha++) = (unsigned char)TIFFGetA(raster[pos]);
pos++;
}
ptr -= 2*w*3; // subtract line we just added plus one line
// subtract line we just added plus one line:
ptr -= 2*w*3;
if ( hasAlpha )
alpha -= 2*w;
}
_TIFFfree( raster );
TIFFClose( tif );
image->SetMask( hasmask );
return true;
}