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Pillow/display.c
Brian Crowell 9519013466 py3k: Modernize type declarations 
This updates several Python type definitions and uses to bring us closer
to Python 3 compatibility. This includes:

* Replacing staticforward and statichere with static. These were a hack for
  old compilers and are not supported/needed anymore.
* Using Py_TYPE() instead of ob_type; ob_type is hidden in Py3.
* Replacing getattr with getters/setters. getattr is sort-of supported in
  Py3, but Py_FindMethod is not. So we just use the newer
  methods/getsetters mechanisms and start using PyType_Ready everywhere.
* Use PyVarObject_HEAD_INIT for types, since types are PyVarObject.
* Use PyMODINIT_FUNC for module initialization functions.

There are some tab/space issues in this commit. I'm set for spaces; the
source is a little schizo.
2013-01-10 08:46:34 -06:00

859 lines
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/*
* The Python Imaging Library.
*
* display support (and other windows-related stuff)
*
* History:
* 1996-05-13 fl Windows DIB support
* 1996-05-21 fl Added palette stuff
* 1996-05-28 fl Added display_mode stuff
* 1997-09-21 fl Added draw primitive
* 2001-09-17 fl Added ImagingGrabScreen (from _grabscreen.c)
* 2002-05-12 fl Added ImagingListWindows
* 2002-11-19 fl Added clipboard support
* 2002-11-25 fl Added GetDC/ReleaseDC helpers
* 2003-05-21 fl Added create window support (including window callback)
* 2003-09-05 fl Added fromstring/tostring methods
* 2009-03-14 fl Added WMF support (from pilwmf)
*
* Copyright (c) 1997-2003 by Secret Labs AB.
* Copyright (c) 1996-1997 by Fredrik Lundh.
*
* See the README file for information on usage and redistribution.
*/
#include "Python.h"
#if PY_VERSION_HEX < 0x01060000
#define PyObject_New PyObject_NEW
#define PyObject_Del PyMem_DEL
#endif
#include "Imaging.h"
/* -------------------------------------------------------------------- */
/* Windows DIB support */
#ifdef WIN32
#include "ImDib.h"
typedef struct {
PyObject_HEAD
ImagingDIB dib;
} ImagingDisplayObject;
static PyTypeObject ImagingDisplayType;
static ImagingDisplayObject*
_new(const char* mode, int xsize, int ysize)
{
ImagingDisplayObject *display;
if (PyType_Ready(&ImagingDisplayType) < 0)
return NULL;
display = PyObject_New(ImagingDisplayObject, &ImagingDisplayType);
if (display == NULL)
return NULL;
display->dib = ImagingNewDIB(mode, xsize, ysize);
if (!display->dib) {
Py_DECREF(display);
return NULL;
}
return display;
}
static void
_delete(ImagingDisplayObject* display)
{
if (display->dib)
ImagingDeleteDIB(display->dib);
PyObject_Del(display);
}
static PyObject*
_expose(ImagingDisplayObject* display, PyObject* args)
{
int hdc;
if (!PyArg_ParseTuple(args, "i", &hdc))
return NULL;
ImagingExposeDIB(display->dib, hdc);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
_draw(ImagingDisplayObject* display, PyObject* args)
{
int hdc;
int dst[4];
int src[4];
if (!PyArg_ParseTuple(args, "i(iiii)(iiii)", &hdc,
dst+0, dst+1, dst+2, dst+3,
src+0, src+1, src+2, src+3))
return NULL;
ImagingDrawDIB(display->dib, hdc, dst, src);
Py_INCREF(Py_None);
return Py_None;
}
extern Imaging PyImaging_AsImaging(PyObject *op);
static PyObject*
_paste(ImagingDisplayObject* display, PyObject* args)
{
Imaging im;
PyObject* op;
int xy[4];
xy[0] = xy[1] = xy[2] = xy[3] = 0;
if (!PyArg_ParseTuple(args, "O|(iiii)", &op, xy+0, xy+1, xy+2, xy+3))
return NULL;
im = PyImaging_AsImaging(op);
if (!im)
return NULL;
if (xy[2] <= xy[0])
xy[2] = xy[0] + im->xsize;
if (xy[3] <= xy[1])
xy[3] = xy[1] + im->ysize;
ImagingPasteDIB(display->dib, im, xy);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
_query_palette(ImagingDisplayObject* display, PyObject* args)
{
int hdc;
int status;
if (!PyArg_ParseTuple(args, "i", &hdc))
return NULL;
status = ImagingQueryPaletteDIB(display->dib, hdc);
return Py_BuildValue("i", status);
}
static PyObject*
_getdc(ImagingDisplayObject* display, PyObject* args)
{
int window;
HDC dc;
if (!PyArg_ParseTuple(args, "i", &window))
return NULL;
dc = GetDC((HWND) window);
if (!dc) {
PyErr_SetString(PyExc_IOError, "cannot create dc");
return NULL;
}
return Py_BuildValue("i", (int) dc);
}
static PyObject*
_releasedc(ImagingDisplayObject* display, PyObject* args)
{
int window, dc;
if (!PyArg_ParseTuple(args, "ii", &window, &dc))
return NULL;
ReleaseDC((HWND) window, (HDC) dc);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
_fromstring(ImagingDisplayObject* display, PyObject* args)
{
char* ptr;
int bytes;
if (!PyArg_ParseTuple(args, "s#:fromstring", &ptr, &bytes))
return NULL;
if (display->dib->ysize * display->dib->linesize != bytes) {
PyErr_SetString(PyExc_ValueError, "wrong size");
return NULL;
}
memcpy(display->dib->bits, ptr, bytes);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
_tostring(ImagingDisplayObject* display, PyObject* args)
{
if (!PyArg_ParseTuple(args, ":tostring"))
return NULL;
return PyString_FromStringAndSize(
display->dib->bits, display->dib->ysize * display->dib->linesize
);
}
static struct PyMethodDef methods[] = {
{"draw", (PyCFunction)_draw, 1},
{"expose", (PyCFunction)_expose, 1},
{"paste", (PyCFunction)_paste, 1},
{"query_palette", (PyCFunction)_query_palette, 1},
{"getdc", (PyCFunction)_getdc, 1},
{"releasedc", (PyCFunction)_releasedc, 1},
{"fromstring", (PyCFunction)_fromstring, 1},
{"tostring", (PyCFunction)_tostring, 1},
{NULL, NULL} /* sentinel */
};
static PyObject*
_getattr_mode(ImagingDisplayObject* self, void* closure)
{
return Py_BuildValue("s", self->dib->mode);
}
static PyObject*
_getattr_size(ImagingDisplayObject* self, void* closure)
{
return Py_BuildValue("ii", self->dib->xsize, self->dib->ysize);
}
static struct PyGetSetDef getsetters[] = {
{ "mode", (getter) _getattr_mode },
{ "size", (getter) _getattr_size },
{ NULL }
};
static PyTypeObject ImagingDisplayType = {
PyVarObject_HEAD_INIT(NULL, 0)
"ImagingDisplay", /*tp_name*/
sizeof(ImagingDisplayObject), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)_delete, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number */
0, /*tp_as_sequence */
0, /*tp_as_mapping */
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
methods, /*tp_methods*/
0, /*tp_members*/
getsetters, /*tp_getset*/
};
PyObject*
PyImaging_DisplayWin32(PyObject* self, PyObject* args)
{
ImagingDisplayObject* display;
char *mode;
int xsize, ysize;
if (!PyArg_ParseTuple(args, "s(ii)", &mode, &xsize, &ysize))
return NULL;
display = _new(mode, xsize, ysize);
if (display == NULL)
return NULL;
return (PyObject*) display;
}
PyObject*
PyImaging_DisplayModeWin32(PyObject* self, PyObject* args)
{
char *mode;
int size[2];
mode = ImagingGetModeDIB(size);
return Py_BuildValue("s(ii)", mode, size[0], size[1]);
}
/* -------------------------------------------------------------------- */
/* Windows screen grabber */
PyObject*
PyImaging_GrabScreenWin32(PyObject* self, PyObject* args)
{
int width, height;
HBITMAP bitmap;
BITMAPCOREHEADER core;
HDC screen, screen_copy;
PyObject* buffer;
/* step 1: create a memory DC large enough to hold the
entire screen */
screen = CreateDC("DISPLAY", NULL, NULL, NULL);
screen_copy = CreateCompatibleDC(screen);
width = GetDeviceCaps(screen, HORZRES);
height = GetDeviceCaps(screen, VERTRES);
bitmap = CreateCompatibleBitmap(screen, width, height);
if (!bitmap)
goto error;
if (!SelectObject(screen_copy, bitmap))
goto error;
/* step 2: copy bits into memory DC bitmap */
if (!BitBlt(screen_copy, 0, 0, width, height, screen, 0, 0, SRCCOPY))
goto error;
/* step 3: extract bits from bitmap */
buffer = PyString_FromStringAndSize(NULL, height * ((width*3 + 3) & -4));
if (!buffer)
return NULL;
core.bcSize = sizeof(core);
core.bcWidth = width;
core.bcHeight = height;
core.bcPlanes = 1;
core.bcBitCount = 24;
if (!GetDIBits(screen_copy, bitmap, 0, height, PyString_AS_STRING(buffer),
(BITMAPINFO*) &core, DIB_RGB_COLORS))
goto error;
DeleteObject(bitmap);
DeleteDC(screen_copy);
DeleteDC(screen);
return Py_BuildValue("(ii)N", width, height, buffer);
error:
PyErr_SetString(PyExc_IOError, "screen grab failed");
DeleteDC(screen_copy);
DeleteDC(screen);
return NULL;
}
static BOOL CALLBACK list_windows_callback(HWND hwnd, LPARAM lParam)
{
PyObject* window_list = (PyObject*) lParam;
PyObject* item;
PyObject* title;
RECT inner, outer;
int title_size;
int status;
/* get window title */
title_size = GetWindowTextLength(hwnd);
if (title_size > 0) {
title = PyString_FromStringAndSize(NULL, title_size);
if (title)
GetWindowText(hwnd, PyString_AS_STRING(title), title_size+1);
} else
title = PyString_FromString("");
if (!title)
return 0;
/* get bounding boxes */
GetClientRect(hwnd, &inner);
GetWindowRect(hwnd, &outer);
item = Py_BuildValue(
"lN(iiii)(iiii)", (long) hwnd, title,
inner.left, inner.top, inner.right, inner.bottom,
outer.left, outer.top, outer.right, outer.bottom
);
if (!item)
return 0;
status = PyList_Append(window_list, item);
Py_DECREF(item);
if (status < 0)
return 0;
return 1;
}
PyObject*
PyImaging_ListWindowsWin32(PyObject* self, PyObject* args)
{
PyObject* window_list;
window_list = PyList_New(0);
if (!window_list)
return NULL;
EnumWindows(list_windows_callback, (LPARAM) window_list);
if (PyErr_Occurred()) {
Py_DECREF(window_list);
return NULL;
}
return window_list;
}
/* -------------------------------------------------------------------- */
/* Windows clipboard grabber */
PyObject*
PyImaging_GrabClipboardWin32(PyObject* self, PyObject* args)
{
int clip;
HANDLE handle;
int size;
void* data;
PyObject* result;
int verbose = 0; /* debugging; will be removed in future versions */
if (!PyArg_ParseTuple(args, "|i", &verbose))
return NULL;
clip = OpenClipboard(NULL);
/* FIXME: check error status */
if (verbose) {
UINT format = EnumClipboardFormats(0);
char buffer[200];
char* result;
while (format != 0) {
if (GetClipboardFormatName(format, buffer, sizeof buffer) > 0)
result = buffer;
else
switch (format) {
case CF_BITMAP:
result = "CF_BITMAP";
break;
case CF_DIB:
result = "CF_DIB";
break;
case CF_DIF:
result = "CF_DIF";
break;
case CF_ENHMETAFILE:
result = "CF_ENHMETAFILE";
break;
case CF_HDROP:
result = "CF_HDROP";
break;
case CF_LOCALE:
result = "CF_LOCALE";
break;
case CF_METAFILEPICT:
result = "CF_METAFILEPICT";
break;
case CF_OEMTEXT:
result = "CF_OEMTEXT";
break;
case CF_OWNERDISPLAY:
result = "CF_OWNERDISPLAY";
break;
case CF_PALETTE:
result = "CF_PALETTE";
break;
case CF_PENDATA:
result = "CF_PENDATA";
break;
case CF_RIFF:
result = "CF_RIFF";
break;
case CF_SYLK:
result = "CF_SYLK";
break;
case CF_TEXT:
result = "CF_TEXT";
break;
case CF_WAVE:
result = "CF_WAVE";
break;
case CF_TIFF:
result = "CF_TIFF";
break;
case CF_UNICODETEXT:
result = "CF_UNICODETEXT";
break;
default:
sprintf(buffer, "[%d]", format);
result = buffer;
break;
}
printf("%s (%d)\n", result, format);
format = EnumClipboardFormats(format);
}
}
handle = GetClipboardData(CF_DIB);
if (!handle) {
/* FIXME: add CF_HDROP support to allow cut-and-paste from
the explorer */
CloseClipboard();
Py_INCREF(Py_None);
return Py_None;
}
size = GlobalSize(handle);
data = GlobalLock(handle);
#if 0
/* calculate proper size for string formats */
if (format == CF_TEXT || format == CF_OEMTEXT)
size = strlen(data);
else if (format == CF_UNICODETEXT)
size = wcslen(data) * 2;
#endif
result = PyString_FromStringAndSize(data, size);
GlobalUnlock(handle);
CloseClipboard();
return result;
}
/* -------------------------------------------------------------------- */
/* Windows class */
#ifndef WM_MOUSEWHEEL
#define WM_MOUSEWHEEL 522
#endif
static int mainloop = 0;
static void
callback_error(const char* handler)
{
PyObject* sys_stderr;
sys_stderr = PySys_GetObject("stderr");
if (sys_stderr) {
PyFile_WriteString("*** ImageWin: error in ", sys_stderr);
PyFile_WriteString((char*) handler, sys_stderr);
PyFile_WriteString(":\n", sys_stderr);
}
PyErr_Print();
PyErr_Clear();
}
static LRESULT CALLBACK
windowCallback(HWND wnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
PyObject* callback = NULL;
PyObject* result;
PyThreadState* threadstate;
PyThreadState* current_threadstate;
HDC dc;
RECT rect;
LRESULT status = 0;
/* set up threadstate for messages that calls back into python */
switch (message) {
case WM_CREATE:
mainloop++;
break;
case WM_DESTROY:
mainloop--;
/* fall through... */
case WM_PAINT:
case WM_SIZE:
callback = (PyObject*) GetWindowLong(wnd, 0);
if (callback) {
threadstate = (PyThreadState*)
GetWindowLong(wnd, sizeof(PyObject*));
current_threadstate = PyThreadState_Swap(NULL);
PyEval_RestoreThread(threadstate);
} else
return DefWindowProc(wnd, message, wParam, lParam);
}
/* process message */
switch (message) {
case WM_PAINT:
/* redraw (part of) window. this generates a WCK-style
damage/clear/repair cascade */
BeginPaint(wnd, &ps);
dc = GetDC(wnd);
GetWindowRect(wnd, &rect); /* in screen coordinates */
result = PyObject_CallFunction(
callback, "siiii", "damage",
ps.rcPaint.left, ps.rcPaint.top,
ps.rcPaint.right, ps.rcPaint.bottom
);
if (result)
Py_DECREF(result);
else
callback_error("window damage callback");
result = PyObject_CallFunction(
callback, "siiiii", "clear", (int) dc,
0, 0, rect.right-rect.left, rect.bottom-rect.top
);
if (result)
Py_DECREF(result);
else
callback_error("window clear callback");
result = PyObject_CallFunction(
callback, "siiiii", "repair", (int) dc,
0, 0, rect.right-rect.left, rect.bottom-rect.top
);
if (result)
Py_DECREF(result);
else
callback_error("window repair callback");
ReleaseDC(wnd, dc);
EndPaint(wnd, &ps);
break;
case WM_SIZE:
/* resize window */
result = PyObject_CallFunction(
callback, "sii", "resize", LOWORD(lParam), HIWORD(lParam)
);
if (result) {
InvalidateRect(wnd, NULL, 1);
Py_DECREF(result);
} else
callback_error("window resize callback");
break;
case WM_DESTROY:
/* destroy window */
result = PyObject_CallFunction(callback, "s", "destroy");
if (result)
Py_DECREF(result);
else
callback_error("window destroy callback");
Py_DECREF(callback);
break;
default:
status = DefWindowProc(wnd, message, wParam, lParam);
}
if (callback) {
/* restore thread state */
PyEval_SaveThread();
PyThreadState_Swap(threadstate);
}
return status;
}
PyObject*
PyImaging_CreateWindowWin32(PyObject* self, PyObject* args)
{
HWND wnd;
WNDCLASS windowClass;
char* title;
PyObject* callback;
int width = 0, height = 0;
if (!PyArg_ParseTuple(args, "sO|ii", &title, &callback, &width, &height))
return NULL;
if (width <= 0)
width = CW_USEDEFAULT;
if (height <= 0)
height = CW_USEDEFAULT;
/* register toplevel window class */
windowClass.style = CS_CLASSDC;
windowClass.cbClsExtra = 0;
windowClass.cbWndExtra = sizeof(PyObject*) + sizeof(PyThreadState*);
windowClass.hInstance = GetModuleHandle(NULL);
/* windowClass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1); */
windowClass.hbrBackground = NULL;
windowClass.lpszMenuName = NULL;
windowClass.lpszClassName = "pilWindow";
windowClass.lpfnWndProc = windowCallback;
windowClass.hIcon = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(1));
windowClass.hCursor = LoadCursor(NULL, IDC_ARROW); /* CROSS? */
RegisterClass(&windowClass); /* FIXME: check return status */
wnd = CreateWindowEx(
0, windowClass.lpszClassName, title,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, width, height,
HWND_DESKTOP, NULL, NULL, NULL
);
if (!wnd) {
PyErr_SetString(PyExc_IOError, "failed to create window");
return NULL;
}
/* register window callback */
Py_INCREF(callback);
SetWindowLong(wnd, 0, (LONG) callback);
SetWindowLong(wnd, sizeof(callback), (LONG) PyThreadState_Get());
Py_BEGIN_ALLOW_THREADS
ShowWindow(wnd, SW_SHOWNORMAL);
SetForegroundWindow(wnd); /* to make sure it's visible */
Py_END_ALLOW_THREADS
return Py_BuildValue("l", (long) wnd);
}
PyObject*
PyImaging_EventLoopWin32(PyObject* self, PyObject* args)
{
MSG msg;
Py_BEGIN_ALLOW_THREADS
while (mainloop && GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
Py_END_ALLOW_THREADS
Py_INCREF(Py_None);
return Py_None;
}
/* -------------------------------------------------------------------- */
/* windows WMF renderer */
#define GET32(p,o) ((DWORD*)(p+o))[0]
PyObject *
PyImaging_DrawWmf(PyObject* self, PyObject* args)
{
HBITMAP bitmap;
HENHMETAFILE meta;
BITMAPCOREHEADER core;
HDC dc;
RECT rect;
PyObject* buffer = NULL;
char* ptr;
char* data;
int datasize;
int width, height;
int x0, y0, x1, y1;
if (!PyArg_ParseTuple(args, "s#(ii)(iiii):_load", &data, &datasize,
&width, &height, &x0, &x1, &y0, &y1))
return NULL;
/* step 1: copy metafile contents into METAFILE object */
if (datasize > 22 && GET32(data, 0) == 0x9ac6cdd7) {
/* placeable windows metafile (22-byte aldus header) */
meta = SetWinMetaFileBits(datasize-22, data+22, NULL, NULL);
} else if (datasize > 80 && GET32(data, 0) == 1 &&
GET32(data, 40) == 0x464d4520) {
/* enhanced metafile */
meta = SetEnhMetaFileBits(datasize, data);
} else {
/* unknown meta format */
meta = NULL;
}
if (!meta) {
PyErr_SetString(PyExc_IOError, "cannot load metafile");
return NULL;
}
/* step 2: create bitmap */
core.bcSize = sizeof(core);
core.bcWidth = width;
core.bcHeight = height;
core.bcPlanes = 1;
core.bcBitCount = 24;
dc = CreateCompatibleDC(NULL);
bitmap = CreateDIBSection(
dc, (BITMAPINFO*) &core, DIB_RGB_COLORS, &ptr, NULL, 0
);
if (!bitmap) {
PyErr_SetString(PyExc_IOError, "cannot create bitmap");
goto error;
}
if (!SelectObject(dc, bitmap)) {
PyErr_SetString(PyExc_IOError, "cannot select bitmap");
goto error;
}
/* step 3: render metafile into bitmap */
rect.left = rect.top = 0;
rect.right = width;
rect.bottom = height;
/* FIXME: make background transparent? configurable? */
FillRect(dc, &rect, GetStockObject(WHITE_BRUSH));
if (!PlayEnhMetaFile(dc, meta, &rect)) {
PyErr_SetString(PyExc_IOError, "cannot render metafile");
goto error;
}
/* step 4: extract bits from bitmap */
GdiFlush();
buffer = PyString_FromStringAndSize(ptr, height * ((width*3 + 3) & -4));
error:
DeleteEnhMetaFile(meta);
if (bitmap)
DeleteObject(bitmap);
DeleteDC(dc);
return buffer;
}
#endif /* WIN32 */
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