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Pillow/Tk/tkImaging.c
wiredfool a71ba1a1c6 comments
2017-01-26 05:55:18 -08:00

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/*
* The Python Imaging Library.
* $Id$
*
* TK interface for Python Imaging objects
*
* Copies (parts of) a named display memory to a photo image object.
* Also contains code to create an display memory. Under Tk, a
* display memory is simply an "L" or "RGB" image memory that is
* allocated in a single block.
*
* To use this module, import the _imagingtk module (ImageTk does
* this for you).
*
* If you're using Python in an embedded context, you can add the
* following lines to your Tcl_AppInit function (in tkappinit.c)
* instead. Put them after the calls to Tcl_Init and Tk_Init:
*
* {
* extern void TkImaging_Init(Tcl_Interp* interp);
* TkImaging_Init(interp);
* }
*
* This registers a Tcl command called "PyImagingPhoto", which is used
* to communicate between PIL and Tk's PhotoImage handler.
*
* History:
* 1995-09-12 fl Created
* 1996-04-08 fl Ready for release
* 1997-05-09 fl Use command instead of image type
* 2001-03-18 fl Initialize alpha layer pointer (struct changed in 8.3)
* 2003-04-23 fl Fixed building for Tk 8.4.1 and later (Jack Jansen)
* 2004-06-24 fl Fixed building for Tk 8.4.6 and later.
*
* Copyright (c) 1997-2004 by Secret Labs AB
* Copyright (c) 1995-2004 by Fredrik Lundh
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
#include "_tkmini.h"
#include <stdlib.h>
/*
* Global vars for Tcl / Tk functions. We load these symbols from the tkinter
* extension module or loaded Tcl / Tk libraries at run-time.
*/
static int TK_LT_85 = 0;
static Tcl_CreateCommand_t TCL_CREATE_COMMAND;
static Tcl_AppendResult_t TCL_APPEND_RESULT;
static Tk_FindPhoto_t TK_FIND_PHOTO;
static Tk_PhotoGetImage_t TK_PHOTO_GET_IMAGE;
static Tk_PhotoPutBlock_84_t TK_PHOTO_PUT_BLOCK_84;
static Tk_PhotoSetSize_84_t TK_PHOTO_SET_SIZE_84;
static Tk_PhotoPutBlock_85_t TK_PHOTO_PUT_BLOCK_85;
static Imaging
ImagingFind(const char* name)
{
Py_ssize_t id;
/* FIXME: use CObject instead? */
#if defined(_MSC_VER) && defined(_WIN64)
id = _atoi64(name);
#else
id = atol(name);
#endif
if (!id)
return NULL;
return (Imaging) id;
}
static int
PyImagingPhotoPut(ClientData clientdata, Tcl_Interp* interp,
int argc, const char **argv)
{
Imaging im;
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
if (argc != 3) {
TCL_APPEND_RESULT(interp, "usage: ", argv[0],
" destPhoto srcImage", (char *) NULL);
return TCL_ERROR;
}
/* get Tcl PhotoImage handle */
photo = TK_FIND_PHOTO(interp, argv[1]);
if (photo == NULL) {
TCL_APPEND_RESULT(
interp, "destination photo must exist", (char *) NULL
);
return TCL_ERROR;
}
/* get PIL Image handle */
im = ImagingFind(argv[2]);
if (!im) {
TCL_APPEND_RESULT(interp, "bad name", (char*) NULL);
return TCL_ERROR;
}
if (!im->block) {
TCL_APPEND_RESULT(interp, "bad display memory", (char*) NULL);
return TCL_ERROR;
}
/* Active region */
#if 0
if (src_xoffset + xsize > im->xsize)
xsize = im->xsize - src_xoffset;
if (src_yoffset + ysize > im->ysize)
ysize = im->ysize - src_yoffset;
if (xsize < 0 || ysize < 0
|| src_xoffset >= im->xsize
|| src_yoffset >= im->ysize)
return TCL_OK;
#endif
/* Mode */
if (strcmp(im->mode, "1") == 0 || strcmp(im->mode, "L") == 0) {
block.pixelSize = 1;
block.offset[0] = block.offset[1] = block.offset[2] = 0;
} else if (strncmp(im->mode, "RGB", 3) == 0) {
block.pixelSize = 4;
block.offset[0] = 0;
block.offset[1] = 1;
block.offset[2] = 2;
if (strcmp(im->mode, "RGBA") == 0)
block.offset[3] = 3; /* alpha (or reserved, under 8.2) */
else
block.offset[3] = 0; /* no alpha */
} else {
TCL_APPEND_RESULT(interp, "Bad mode", (char*) NULL);
return TCL_ERROR;
}
block.width = im->xsize;
block.height = im->ysize;
block.pitch = im->linesize;
block.pixelPtr = (unsigned char*) im->block;
#if 0
block.pixelPtr = (unsigned char*) im->block +
src_yoffset * im->linesize +
src_xoffset * im->pixelsize;
#endif
if (TK_LT_85) { /* Tk 8.4 */
TK_PHOTO_PUT_BLOCK_84(photo, &block, 0, 0, block.width, block.height,
TK_PHOTO_COMPOSITE_SET);
if (strcmp(im->mode, "RGBA") == 0)
/* Tk workaround: we need apply ToggleComplexAlphaIfNeeded */
/* (fixed in Tk 8.5a3) */
TK_PHOTO_SET_SIZE_84(photo, block.width, block.height);
} else {
/* Tk >=8.5 */
TK_PHOTO_PUT_BLOCK_85(interp, photo, &block, 0, 0, block.width,
block.height, TK_PHOTO_COMPOSITE_SET);
}
return TCL_OK;
}
/* Warning -- this does not work at all */
static int
PyImagingPhotoGet(ClientData clientdata, Tcl_Interp* interp,
int argc, const char **argv)
{
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
if (argc != 2) {
TCL_APPEND_RESULT(interp, "usage: ", argv[0],
" srcPhoto", (char *) NULL);
return TCL_ERROR;
}
/* get Tcl PhotoImage handle */
photo = TK_FIND_PHOTO(interp, argv[1]);
if (photo == NULL) {
TCL_APPEND_RESULT(
interp, "source photo must exist", (char *) NULL
);
return TCL_ERROR;
}
TK_PHOTO_GET_IMAGE(photo, &block);
printf("pixelPtr = %p\n", block.pixelPtr);
printf("width = %d\n", block.width);
printf("height = %d\n", block.height);
printf("pitch = %d\n", block.pitch);
printf("pixelSize = %d\n", block.pixelSize);
printf("offset = %d %d %d %d\n", block.offset[0], block.offset[1],
block.offset[2], block.offset[3]);
TCL_APPEND_RESULT(
interp, "this function is not yet supported", (char *) NULL
);
return TCL_ERROR;
}
void
TkImaging_Init(Tcl_Interp* interp)
{
TCL_CREATE_COMMAND(interp, "PyImagingPhoto", PyImagingPhotoPut,
(ClientData) 0, (Tcl_CmdDeleteProc*) NULL);
TCL_CREATE_COMMAND(interp, "PyImagingPhotoGet", PyImagingPhotoGet,
(ClientData) 0, (Tcl_CmdDeleteProc*) NULL);
}
/*
* Functions to fill global Tcl / Tk function pointers by dynamic loading
*/
#define TKINTER_FINDER "PIL._tkinter_finder"
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
/*
* On Windows, we can't load the tkinter module to get the Tcl or Tk symbols,
* because Windows does not load symbols into the library name-space of
* importing modules. So, knowing that tkinter has already been imported by
* Python, we scan all modules in the running process for the Tcl and Tk
* function names.
*/
#include <windows.h>
#define PSAPI_VERSION 1
#include <psapi.h>
/* Must be linked with 'psapi' library */
#if PY_VERSION_HEX >= 0x03000000
#define TKINTER_PKG "tkinter"
#else
#define TKINTER_PKG "Tkinter"
#endif
FARPROC _dfunc(HMODULE lib_handle, const char *func_name)
{
/*
* Load function `func_name` from `lib_handle`.
* Set Python exception if we can't find `func_name` in `lib_handle`.
* Returns function pointer or NULL if not present.
*/
char message[100];
FARPROC func = GetProcAddress(lib_handle, func_name);
if (func == NULL) {
sprintf(message, "Cannot load function %s", func_name);
PyErr_SetString(PyExc_RuntimeError, message);
}
return func;
}
int get_tcl(HMODULE hMod)
{
/*
* Try to fill Tcl global vars with function pointers. Return 0 for no
* functions found, 1 for all functions found, -1 for some but not all
* functions found.
*/
if ((TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
GetProcAddress(hMod, "Tcl_CreateCommand")) == NULL) {
return 0; /* Maybe not Tcl module */
}
return ((TCL_APPEND_RESULT = (Tcl_AppendResult_t) _dfunc(hMod,
"Tcl_AppendResult")) == NULL) ? -1 : 1;
}
int get_tk(HMODULE hMod)
{
/*
* Try to fill Tk global vars with function pointers. Return 0 for no
* functions found, 1 for all functions found, -1 for some but not all
* functions found.
*/
FARPROC func = GetProcAddress(hMod, "Tk_PhotoPutBlock");
if (func == NULL) { /* Maybe not Tk module */
return 0;
}
if ((TK_PHOTO_GET_IMAGE = (Tk_PhotoGetImage_t)
_dfunc(hMod, "Tk_PhotoGetImage")) == NULL) { return -1; };
if ((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(hMod, "Tk_FindPhoto")) == NULL) { return -1; };
TK_LT_85 = GetProcAddress(hMod, "Tk_PhotoPutBlock_Panic") == NULL;
/* Tk_PhotoPutBlock_Panic defined as of 8.5.0 */
if (TK_LT_85) {
TK_PHOTO_PUT_BLOCK_84 = (Tk_PhotoPutBlock_84_t) func;
return ((TK_PHOTO_SET_SIZE_84 = (Tk_PhotoSetSize_84_t)
_dfunc(hMod, "Tk_PhotoSetSize")) == NULL) ? -1 : 1;
}
TK_PHOTO_PUT_BLOCK_85 = (Tk_PhotoPutBlock_85_t) func;
return 1;
}
int load_tkinter_funcs(void)
{
/*
* Load Tcl and Tk functions by searching all modules in current process.
* Return 0 for success, non-zero for failure.
*/
HMODULE hMods[1024];
HANDLE hProcess;
DWORD cbNeeded;
unsigned int i;
int found_tcl = 0;
int found_tk = 0;
/* First load tkinter module to make sure libraries are loaded */
PyObject *pModule = PyImport_ImportModule(TKINTER_PKG);
if (pModule == NULL) {
return 1;
}
Py_DECREF(pModule);
/* Returns pseudo-handle that does not need to be closed */
hProcess = GetCurrentProcess();
/* Iterate through modules in this process looking for Tcl / Tk names */
if (EnumProcessModules(hProcess, hMods, sizeof(hMods), &cbNeeded)) {
for (i = 0; i < (cbNeeded / sizeof(HMODULE)); i++) {
if (!found_tcl) {
found_tcl = get_tcl(hMods[i]);
if (found_tcl == -1) {
return 1;
}
}
if (!found_tk) {
found_tk = get_tk(hMods[i]);
if (found_tk == -1) {
return 1;
}
}
if (found_tcl && found_tk) {
return 0;
}
}
}
if (found_tcl == 0) {
PyErr_SetString(PyExc_RuntimeError, "Could not find Tcl routines");
} else {
PyErr_SetString(PyExc_RuntimeError, "Could not find Tk routines");
}
return 1;
}
#else /* not Windows */
/*
* On Unix, we can get the Tcl and Tk symbols from the tkinter module, because
* tkinter uses these symbols, and the symbols are therefore visible in the
* tkinter dynamic library (module).
*/
/* From module __file__ attribute to char *string for dlopen. */
#if PY_VERSION_HEX >= 0x03000000
char *fname2char(PyObject *fname)
{
PyObject* bytes;
bytes = PyUnicode_EncodeFSDefault(fname);
if (bytes == NULL) {
return NULL;
}
return PyBytes_AsString(bytes);
}
#else
#define fname2char(s) (PyString_AsString(s))
#endif
#include <dlfcn.h>
void *_dfunc(void *lib_handle, const char *func_name)
{
/*
* Load function `func_name` from `lib_handle`.
* Set Python exception if we can't find `func_name` in `lib_handle`.
* Returns function pointer or NULL if not present.
*/
void* func;
/* Reset errors. */
dlerror();
func = dlsym(lib_handle, func_name);
if (func == NULL) {
const char *error = dlerror();
PyErr_SetString(PyExc_RuntimeError, error);
}
return func;
}
int _func_loader(void *lib)
{
/*
* Fill global function pointers from dynamic lib.
* Return 1 if any pointer is NULL, 0 otherwise.
*/
if ((TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
_dfunc(lib, "Tcl_CreateCommand")) == NULL) { return 1; }
if ((TCL_APPEND_RESULT = (Tcl_AppendResult_t) _dfunc(lib,
"Tcl_AppendResult")) == NULL) { return 1; }
if ((TK_PHOTO_GET_IMAGE = (Tk_PhotoGetImage_t)
_dfunc(lib, "Tk_PhotoGetImage")) == NULL) { return 1; }
if ((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(lib, "Tk_FindPhoto")) == NULL) { return 1; }
/* Tk_PhotoPutBlock_Panic defined as of 8.5.0 */
TK_LT_85 = (dlsym(lib, "Tk_PhotoPutBlock_Panic") == NULL);
if (TK_LT_85) {
return (((TK_PHOTO_PUT_BLOCK_84 = (Tk_PhotoPutBlock_84_t)
_dfunc(lib, "Tk_PhotoPutBlock")) == NULL) ||
((TK_PHOTO_SET_SIZE_84 = (Tk_PhotoSetSize_84_t)
_dfunc(lib, "Tk_PhotoSetSize")) == NULL));
}
return ((TK_PHOTO_PUT_BLOCK_85 = (Tk_PhotoPutBlock_85_t)
_dfunc(lib, "Tk_PhotoPutBlock")) == NULL);
}
int load_tkinter_funcs(void)
{
/*
* Load tkinter global funcs from tkinter compiled module.
* Return 0 for success, non-zero for failure.
*/
int ret = -1;
void *main_program, *tkinter_lib;
char *tkinter_libname;
PyObject *pModule = NULL, *pString = NULL;
/* Try loading from the main program namespace first */
main_program = dlopen(NULL, RTLD_LAZY);
if (_func_loader(main_program) == 0) {
return 0;
}
/* Clear exception triggered when we didn't find symbols above */
PyErr_Clear();
/* Now try finding the tkinter compiled module */
pModule = PyImport_ImportModule(TKINTER_FINDER);
if (pModule == NULL) {
goto exit;
}
pString = PyObject_GetAttrString(pModule, "TKINTER_LIB");
if (pString == NULL) {
goto exit;
}
tkinter_libname = fname2char(pString);
if (tkinter_libname == NULL) {
goto exit;
}
tkinter_lib = dlopen(tkinter_libname, RTLD_LAZY);
if (tkinter_lib == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"Cannot dlopen tkinter module file");
goto exit;
}
ret = _func_loader(tkinter_lib);
/* dlclose probably safe because tkinter has been imported. */
dlclose(tkinter_lib);
exit:
Py_XDECREF(pModule);
Py_XDECREF(pString);
return ret;
}
#endif /* end not Windows */
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