Hi,
cmsCreateTransform is not thread safe using 1.16 or 1.17b. Note, using
cmsCreate_sRGBProfile() instead of
cmsOpenProfileFromFile("AdobeRGB1998.icc","rb") does work, and so does
calling the two cmsCreateTransform()'s in succession. Test env: 32bit debug
target built with VS2005 on Vista64.
Louis Solomon
www.SteelBytes.com
#include <windows.h>
#include "lcms\lcms.h"
static cmsHPROFILE prof_xyz,prof_rgb;
static cmsHTRANSFORM trans_xyz_to_rgb,trans_rgb_to_xyz;
static DWORD WINAPI make_trans_xyz_to_rgb(LPVOID lpParameter)
{
trans_xyz_to_rgb = cmsCreateTransform(
prof_xyz,TYPE_XYZ_DBL,
prof_rgb,TYPE_RGB_DBL,
INTENT_ABSOLUTE_COLORIMETRIC,cmsFLAGS_NOTPRECALC);
return 0;
}
static DWORD WINAPI make_trans_rgb_to_xyz(LPVOID lpParameter)
{
trans_rgb_to_xyz = cmsCreateTransform(
prof_rgb,TYPE_RGB_DBL,
prof_xyz,TYPE_XYZ_DBL,
INTENT_ABSOLUTE_COLORIMETRIC,cmsFLAGS_NOTPRECALC);
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR
lpCmdLine,int nCmdShow)
{
prof_xyz = cmsCreateXYZProfile();
prof_rgb = cmsOpenProfileFromFile("AdobeRGB1998.icc","rb");
//cmsCreate_sRGBProfile();
for (int i=0;i<10;++i)
{
#define try_threads
#ifdef try_threads
DWORD threadid;
HANDLE workers[2];
workers[0] = CreateThread(NULL,0,make_trans_xyz_to_rgb,NULL,0,&threadid);
workers[1] = CreateThread(NULL,0,make_trans_rgb_to_xyz,NULL,0,&threadid);
WaitForMultipleObjects(2,workers,TRUE,INFINITE);
for (unsigned i=0;i<2;++i)
CloseHandle(workers[i]);
#else
make_trans_xyz_to_rgb(0);
make_trans_rgb_to_xyz(0);
#endif
cmsDeleteTransform(trans_xyz_to_rgb);
cmsDeleteTransform(trans_rgb_to_xyz);
}
cmsCloseProfile(prof_rgb);
cmsCloseProfile(prof_xyz);
}
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