matplotlib/src/_tkagg.cpp at master · rryan/matplotlib · GitHub

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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 "py_converters.h"

// Include our own excerpts from the Tcl / Tk headers

#include "_tkmini.h"

#if defined(_MSC_VER)

# define SIZE_T_FORMAT "%Iu"

#else

# define SIZE_T_FORMAT "%zu"

#endif

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;

PyObject *bufferobj;

// vars for blitting

PyObject *bboxo;

size_t aggl, bboxl;

bool has_bbox;

uint8_t *destbuffer;

int destx, desty, destwidth, destheight, deststride;

//unsigned long tmp_ptr;

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 array (or object that can be converted to array) pointer */

if (sscanf(argv[2], SIZE_T_FORMAT, &aggl) != 1) {

TCL_APPEND_RESULT(interp, "error casting pointer", (char *)NULL);

return TCL_ERROR;

}

bufferobj = (PyObject *)aggl;

numpy::array_view<uint8_t, 3> buffer;

try {

buffer = numpy::array_view<uint8_t, 3>(bufferobj);

} catch (...) {

TCL_APPEND_RESULT(interp, "buffer is of wrong type", (char *)NULL);

PyErr_Clear();

return TCL_ERROR;

}

int srcheight = buffer.dim(0);

/* XXX insert aggRenderer type check */

/* 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 */

if (sscanf(argv[4], SIZE_T_FORMAT, &bboxl) != 1) {

TCL_APPEND_RESULT(interp, "error casting pointer", (char *)NULL);

return TCL_ERROR;

}

bboxo = (PyObject *)bboxl;

if (bboxo != NULL && bboxo != Py_None) {

agg::rect_d rect;

if (!convert_rect(bboxo, &rect)) {

return TCL_ERROR;

}

has_bbox = true;

destx = (int)rect.x1;

desty = srcheight - (int)rect.y2;

destwidth = (int)(rect.x2 - rect.x1);

destheight = (int)(rect.y2 - rect.y1);

deststride = 4 * destwidth;

destbuffer = new agg::int8u[deststride * destheight];

if (destbuffer == NULL) {

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, destx, 0),

deststride);

}

} else {

has_bbox = false;

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 = buffer.dim(1);

block.height = buffer.dim(0);

block.pitch = (int)block.width * nval;

block.pixelPtr = buffer.data();

/* 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 *)PyLong_AsVoidPtr(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 PyMethodDef functions[] = {

/* Tkinter interface stuff */

{ "tkinit", (PyCFunction)_tkinit, 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;

}

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;

// 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 synbols from the tkinter module, because

* tkinter uses these symbols, and the symbols are therefore visible in the

* tkinter dynamic library (module).

#if PY3K

#define TKINTER_PKG "tkinter"

#define TKINTER_MOD "_tkinter"

// From module __file__ attribute to char *string for dlopen.

char *fname2char(PyObject *fname)

{

PyObject* bytes;

bytes = PyUnicode_EncodeFSDefault(fname);

if (bytes == NULL) {

return NULL;

}

return PyBytes_AsString(bytes);

}

#else

#define TKINTER_PKG "Tkinter"

#define TKINTER_MOD "tkinter"

// From module __file__ attribute to char *string for dlopen

#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.

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));

}

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, *pSubmodule = 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_PKG);

if (pModule == NULL) {

goto exit;

}

pSubmodule = PyObject_GetAttrString(pModule, TKINTER_MOD);

if (pSubmodule == NULL) {

goto exit;

}

pString = PyObject_GetAttrString(pSubmodule, "__file__");

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(pSubmodule);

Py_XDECREF(pString);

return ret;

}

#endif // end not Windows

#if PY3K

static PyModuleDef _tkagg_module = { PyModuleDef_HEAD_INIT, "_tkagg", "", -1, functions,

NULL, NULL, NULL, NULL };

PyMODINIT_FUNC PyInit__tkagg(void)

{

PyObject *m;

m = PyModule_Create(&_tkagg_module);

import_array();

return (load_tkinter_funcs() == 0) ? m : NULL;

}

#else

PyMODINIT_FUNC init_tkagg(void)

{

import_array();

Py_InitModule("_tkagg", functions);

load_tkinter_funcs();

}

#endif

matplotlib/src/_tkagg.cpp at master · rryan/matplotlib · GitHub

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