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Copy path_tkagg.cpp
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463 lines (407 loc) · 13.5 KB
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/* -*- mode: c++; c-basic-offset: 4 -*- */
/*
* This code is derived from The Python Imaging Library and is covered
* by the PIL license.
*
* See LICENSE/LICENSE.PIL for details.
*
*/
#include <Python.h>
#include <cstdlib>
#include <cstdio>
#include <sstream>
#include <agg_basics.h> // agg:int8u
// Include our own excerpts from the Tcl / Tk headers
#include "_tkmini.h"
#include "py_converters.h"
#if defined(_MSC_VER)
# define IMG_FORMAT "%d %d %Iu"
#else
# define IMG_FORMAT "%d %d %zu"
#endif
#define BBOX_FORMAT "%f %f %f %f"
typedef struct
{
PyObject_HEAD
Tcl_Interp *interp;
} TkappObject;
// Global vars for Tcl / Tk functions. We load these symbols from the tkinter
// extension module or loaded Tcl / Tk libraries at run-time.
static Tcl_CreateCommand_t TCL_CREATE_COMMAND;
static Tcl_AppendResult_t TCL_APPEND_RESULT;
static Tk_MainWindow_t TK_MAIN_WINDOW;
static Tk_FindPhoto_t TK_FIND_PHOTO;
static Tk_PhotoPutBlock_NoComposite_t TK_PHOTO_PUT_BLOCK_NO_COMPOSITE;
static Tk_PhotoBlank_t TK_PHOTO_BLANK;
static int PyAggImagePhoto(ClientData clientdata, Tcl_Interp *interp, int
argc, char **argv)
{
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
// vars for blitting
size_t pdata;
int wdata, hdata, bbox_parse;
float x1, x2, y1, y2;
bool has_bbox;
agg::int8u *destbuffer, *buffer;
int destx, desty, destwidth, destheight, deststride;
long mode;
long nval;
if (TK_MAIN_WINDOW(interp) == NULL) {
// Will throw a _tkinter.TclError with "this isn't a Tk application"
return TCL_ERROR;
}
if (argc != 5) {
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 buffer from str which is "height width ptr" */
if (sscanf(argv[2], IMG_FORMAT, &hdata, &wdata, &pdata) != 3) {
TCL_APPEND_RESULT(interp,
"error reading data, expected height width ptr",
(char *)NULL);
return TCL_ERROR;
}
buffer = (agg::int8u*)pdata;
/* get array mode (0=mono, 1=rgb, 2=rgba) */
mode = atol(argv[3]);
if ((mode != 0) && (mode != 1) && (mode != 2)) {
TCL_APPEND_RESULT(interp, "illegal image mode", (char *)NULL);
return TCL_ERROR;
}
/* check for bbox/blitting */
bbox_parse = sscanf(argv[4], BBOX_FORMAT, &x1, &x2, &y1, &y2);
if (bbox_parse == 4) {
has_bbox = true;
}
else if ((bbox_parse == 1) && (x1 == 0)){
has_bbox = false;
} else {
TCL_APPEND_RESULT(interp, "illegal bbox", (char *)NULL);
return TCL_ERROR;
}
if (has_bbox) {
int srcstride = wdata * 4;
destx = (int)x1;
desty = (int)(hdata - y2);
destwidth = (int)(x2 - x1);
destheight = (int)(y2 - y1);
deststride = 4 * destwidth;
try {
destbuffer = new agg::int8u[deststride * destheight];
}
catch (const std::bad_alloc &) {
TCL_APPEND_RESULT(interp, "could not allocate memory", (char *)NULL);
return TCL_ERROR;
}
for (int i = 0; i < destheight; ++i) {
memcpy(destbuffer + (deststride * i),
&buffer[(i + desty) * srcstride + (destx * 4)],
deststride);
}
} else {
destbuffer = NULL;
destx = desty = destwidth = destheight = deststride = 0;
}
/* setup tkblock */
block.pixelSize = 1;
if (mode == 0) {
block.offset[0] = block.offset[1] = block.offset[2] = 0;
nval = 1;
} else {
block.offset[0] = 0;
block.offset[1] = 1;
block.offset[2] = 2;
if (mode == 1) {
block.offset[3] = 0;
block.pixelSize = 3;
nval = 3;
} else {
block.offset[3] = 3;
block.pixelSize = 4;
nval = 4;
}
}
if (has_bbox) {
block.width = destwidth;
block.height = destheight;
block.pitch = deststride;
block.pixelPtr = destbuffer;
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE(photo, &block, destx, desty,
destwidth, destheight);
delete[] destbuffer;
} else {
block.width = wdata;
block.height = hdata;
block.pitch = (int)block.width * nval;
block.pixelPtr = buffer;
/* Clear current contents */
TK_PHOTO_BLANK(photo);
/* Copy opaque block to photo image, and leave the rest to TK */
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE(photo, &block, 0, 0, block.width,
block.height);
}
return TCL_OK;
}
static PyObject *_tkinit(PyObject *self, PyObject *args)
{
Tcl_Interp *interp;
TkappObject *app;
PyObject *arg;
int is_interp;
if (!PyArg_ParseTuple(args, "Oi", &arg, &is_interp)) {
return NULL;
}
if (is_interp) {
interp = (Tcl_Interp *)PyLong_AsVoidPtr(arg);
} else {
/* Do it the hard way. This will break if the TkappObject
layout changes */
app = (TkappObject *)arg;
interp = app->interp;
}
/* This will bomb if interp is invalid... */
TCL_CREATE_COMMAND(interp,
"PyAggImagePhoto",
(Tcl_CmdProc *)PyAggImagePhoto,
(ClientData)0,
(Tcl_CmdDeleteProc *)NULL);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *mpl_tk_blit(PyObject *self, PyObject *args)
{
Tcl_Interp *interp;
char const *photo_name;
int height, width;
unsigned char *data_ptr;
int o0, o1, o2, o3;
int x1, x2, y1, y2;
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
if (!PyArg_ParseTuple(args, "O&s(iiO&)(iiii)(iiii):blit",
convert_voidptr, &interp, &photo_name,
&height, &width, convert_voidptr, &data_ptr,
&o0, &o1, &o2, &o3,
&x1, &x2, &y1, &y2)) {
goto exit;
}
if (!(photo = TK_FIND_PHOTO(interp, photo_name))) {
PyErr_SetString(PyExc_ValueError, "Failed to extract Tk_PhotoHandle");
goto exit;
}
block.pixelPtr = data_ptr + 4 * ((height - y2) * width + x1);
block.width = x2 - x1;
block.height = y2 - y1;
block.pitch = 4 * width;
block.pixelSize = 4;
block.offset[0] = o0;
block.offset[1] = o1;
block.offset[2] = o2;
block.offset[3] = o3;
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE(
photo, &block, x1, height - y2, x2 - x1, y2 - y1);
exit:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_RETURN_NONE;
}
}
static PyMethodDef functions[] = {
/* Tkinter interface stuff */
{ "tkinit", (PyCFunction)_tkinit, 1 },
{ "blit", (PyCFunction)mpl_tk_blit, 1 },
{ NULL, NULL } /* sentinel */
};
// Functions to fill global TCL / Tk function pointers by dynamic loading
#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
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.
TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
GetProcAddress(hMod, "Tcl_CreateCommand");
if (TCL_CREATE_COMMAND == NULL) { // Maybe not TCL module
return 0;
}
TCL_APPEND_RESULT = (Tcl_AppendResult_t) _dfunc(hMod, "Tcl_AppendResult");
return (TCL_APPEND_RESULT == 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.
TK_MAIN_WINDOW = (Tk_MainWindow_t)
GetProcAddress(hMod, "Tk_MainWindow");
if (TK_MAIN_WINDOW == NULL) { // Maybe not Tk module
return 0;
}
return // -1 if any remaining symbols are NULL
((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(hMod, "Tk_FindPhoto")) == NULL) ||
((TK_PHOTO_PUT_BLOCK_NO_COMPOSITE = (Tk_PhotoPutBlock_NoComposite_t)
_dfunc(hMod, "Tk_PhotoPutBlock_NoComposite")) == NULL) ||
((TK_PHOTO_BLANK = (Tk_PhotoBlank_t)
_dfunc(hMod, "Tk_PhotoBlank")) == NULL)
? -1 : 1;
}
void load_tkinter_funcs(void)
{
// Load TCL and Tk functions by searching all modules in current process.
// Sets an error on failure.
HMODULE hMods[1024];
HANDLE hProcess;
DWORD cbNeeded;
unsigned int i;
int found_tcl = 0;
int found_tk = 0;
// 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;
}
}
if (!found_tk) {
found_tk = get_tk(hMods[i]);
if (found_tk == -1) {
return;
}
}
if (found_tcl && found_tk) {
return;
}
}
}
if (found_tcl == 0) {
PyErr_SetString(PyExc_RuntimeError, "Could not find TCL routines");
} else {
PyErr_SetString(PyExc_RuntimeError, "Could not find Tk routines");
}
return;
}
#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).
*/
#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) {
PyErr_SetString(PyExc_RuntimeError, dlerror());
}
return func;
}
int _func_loader(void *lib)
{
// Fill global function pointers from dynamic lib.
// Return 1 if any pointer is NULL, 0 otherwise.
return
((TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
_dfunc(lib, "Tcl_CreateCommand")) == NULL) ||
((TCL_APPEND_RESULT = (Tcl_AppendResult_t)
_dfunc(lib, "Tcl_AppendResult")) == NULL) ||
((TK_MAIN_WINDOW = (Tk_MainWindow_t)
_dfunc(lib, "Tk_MainWindow")) == NULL) ||
((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(lib, "Tk_FindPhoto")) == NULL) ||
((TK_PHOTO_PUT_BLOCK_NO_COMPOSITE = (Tk_PhotoPutBlock_NoComposite_t)
_dfunc(lib, "Tk_PhotoPutBlock_NoComposite")) == NULL) ||
((TK_PHOTO_BLANK = (Tk_PhotoBlank_t)
_dfunc(lib, "Tk_PhotoBlank")) == NULL);
}
void load_tkinter_funcs(void)
{
// Load tkinter global funcs from tkinter compiled module.
// Sets an error on failure.
void *main_program, *tkinter_lib;
PyObject *module = NULL, *py_path = NULL, *py_path_b = NULL;
char *path;
// Try loading from the main program namespace first.
main_program = dlopen(NULL, RTLD_LAZY);
if (_func_loader(main_program) == 0) {
goto exit;
}
// Clear exception triggered when we didn't find symbols above.
PyErr_Clear();
// Handle PyPy first, as that import will correctly fail on CPython.
module = PyImport_ImportModule("_tkinter.tklib_cffi"); // PyPy
if (!module) {
PyErr_Clear();
module = PyImport_ImportModule("_tkinter"); // CPython
}
if (!(module &&
(py_path = PyObject_GetAttrString(module, "__file__")) &&
(py_path_b = PyUnicode_EncodeFSDefault(py_path)) &&
(path = PyBytes_AsString(py_path_b)))) {
goto exit;
}
tkinter_lib = dlopen(path, RTLD_LAZY);
if (!tkinter_lib) {
PyErr_SetString(PyExc_RuntimeError, dlerror());
goto exit;
}
_func_loader(tkinter_lib);
// dlclose is safe because tkinter has been imported.
dlclose(tkinter_lib);
goto exit;
exit:
Py_XDECREF(module);
Py_XDECREF(py_path);
Py_XDECREF(py_path_b);
}
#endif // end not Windows
static PyModuleDef _tkagg_module = {
PyModuleDef_HEAD_INIT, "_tkagg", "", -1, functions, NULL, NULL, NULL, NULL
};
PyMODINIT_FUNC PyInit__tkagg(void)
{
load_tkinter_funcs();
return PyErr_Occurred() ? NULL : PyModule_Create(&_tkagg_module);
}
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