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PIKApp/plug-ins/screenshot/screenshot-win32.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Screenshot plug-in
* Copyright 1998-2007 Sven Neumann <sven@gimp.org>
* Copyright 2003 Henrik Brix Andersen <brix@gimp.org>
* Copyright 2012 Simone Karin Lehmann - OS X patches
* Copyright 2018 Gil Eliyahu <gileli121@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <glib.h>
#ifdef G_OS_WIN32
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Necessary in order to have SetProcessDPIAware() defined.
* This value of _WIN32_WINNT corresponds to Windows 7, which is our
* minimum supported platform.
*/
#ifdef _WIN32_WINNT
#undef _WIN32_WINNT
#endif
#define _WIN32_WINNT 0x0601
#include <windows.h>
#include <libpika/pika.h>
#include <libpika/pikaui.h>
#include "screenshot.h"
#include "screenshot-win32.h"
#include "screenshot-win32-resource.h"
#include "libpika/stdplugins-intl.h"
#include "screenshot-win32-magnification-api.h"
#include "screenshot-win32-dwm-api.h"
/*
* Application definitions
*/
#define SELECT_FRAME 0
#define SELECT_CLIENT 1
#define SELECT_WINDOW 2
#define SHOW_WINDOW FALSE
#define APP_NAME "plug_in_screenshot_win"
#define WM_DOCAPTURE (WM_USER + 100)
/* Prototypes */
void setCaptureType (int capType);
BOOL InitApplication (HINSTANCE hInstance);
BOOL InitInstance (HINSTANCE hInstance,
int nCmdShow);
int winsnapWinMain (void);
/* File variables */
static int captureType;
static char buffer[512];
static guchar *capBytes = NULL;
static HWND mainHwnd = NULL;
static HINSTANCE hInst = NULL;
static HCURSOR selectCursor = 0;
static ICONINFO iconInfo;
static MAGIMAGEHEADER returnedSrcheader;
static int rectScreensCount = 0;
static PikaImage **image;
static gboolean capturePointer = FALSE;
static void sendBMPToPika (HBITMAP hBMP,
HDC hDC,
RECT rect);
static int doWindowCapture (void);
static gboolean doCapture (HWND selectedHwnd);
static BOOL isWindowIsAboveCaptureRegion (HWND hwndWindow,
RECT rectCapture);
static gboolean doCaptureMagnificationAPI (HWND selectedHwnd,
RECT rect);
static void doCaptureMagnificationAPI_callback (HWND hwnd,
void *srcdata,
MAGIMAGEHEADER srcheader,
void *destdata,
MAGIMAGEHEADER destheader,
RECT unclipped,
RECT clipped,
HRGN dirty);
static gboolean doCaptureBitBlt (HWND selectedHwnd,
RECT rect);
BOOL CALLBACK dialogProc (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
gboolean isDwmCompositionEnabled (void);
/* Data structure holding data between runs */
typedef struct {
gint root;
guint delay;
gint decor;
} WinSnapValues;
/* Default WinSnap values */
static WinSnapValues winsnapvals =
{
FALSE,
0,
TRUE,
};
/* The dialog information */
typedef struct {
#ifdef CAN_SET_DECOR
GtkWidget *decor_button;
#endif
GtkWidget *single_button;
GtkWidget *root_button;
GtkWidget *delay_spinner;
} WinSnapInterface;
/* We create a DIB section to hold the grabbed area. The scanlines in
* DIB sections are aligned on a LONG (four byte) boundary. Its pixel
* data is in RGB (BGR actually) format, three bytes per pixel.
*
* PIKA uses no alignment for its pixel regions. The PIKA image we
* create is of type RGB, i.e. three bytes per pixel, too. Thus in
* order to be able to quickly transfer all of the image at a time, we
* must use a DIB section and pixel region the scanline width in
* bytes of which is evenly divisible with both 3 and 4. I.e. it must
* be a multiple of 12 bytes, or in pixels, a multiple of four pixels.
*/
#define ROUND4(width) (((width-1)/4+1)*4)
gboolean
screenshot_win32_available (void)
{
return TRUE;
}
ScreenshotCapabilities
screenshot_win32_get_capabilities (void)
{
return (SCREENSHOT_CAN_SHOOT_DECORATIONS |
SCREENSHOT_CAN_SHOOT_WINDOW |
SCREENSHOT_CAN_SHOOT_POINTER);
}
PikaPDBStatusType
screenshot_win32_shoot (ScreenshotValues *shootvals,
GdkMonitor *monitor,
PikaImage **_image,
GError **error)
{
PikaPDBStatusType status = PIKA_PDB_EXECUTION_ERROR;
/* leave "shootvals->monitor" alone until somebody patches the code
* to be able to get a monitor's color profile
*/
image = _image;
winsnapvals.delay = shootvals->screenshot_delay;
capturePointer = shootvals->show_cursor;
if (shootvals->shoot_type == SHOOT_ROOT)
{
doCapture (0);
status = PIKA_PDB_SUCCESS;
}
else if (shootvals->shoot_type == SHOOT_WINDOW)
{
status = 0 == doWindowCapture () ? PIKA_PDB_CANCEL : PIKA_PDB_SUCCESS;
}
else if (shootvals->shoot_type == SHOOT_REGION)
{
/* FIXME */
}
if (status == PIKA_PDB_SUCCESS)
{
PikaColorProfile *profile;
/* XXX No idea if the "monitor" value is right at all, especially
* considering above comment. Just make so that it at least
* compiles!
*/
profile = pika_monitor_get_color_profile (monitor);
if (profile)
{
pika_image_set_color_profile (*image, profile);
g_object_unref (profile);
}
}
return status;
}
/******************************************************************
* PIKA format and transfer functions
******************************************************************/
/*
* flipRedAndBlueBytes
*
* Microsoft has chosen to provide us a very nice (not!)
* interface for retrieving bitmap bits. DIBSections have
* RGB information as BGR instead. So, we have to swap
* the silly red and blue bytes before sending to the
* PIKA.
*/
static void
flipRedAndBlueBytes (int width,
int height)
{
int i, j;
guchar *bufp;
guchar temp;
j = 0;
while (j < height) {
i = width;
bufp = capBytes + j*ROUND4(width)*3;
while (i--) {
temp = bufp[2];
bufp[2] = bufp[0];
bufp[0] = temp;
bufp += 3;
}
j++;
}
}
/*
* rgbaToRgbBytes
*
* Convert rgba array to rgb array
*/
static void
rgbaToRgbBytes (guchar *rgbBufp,
guchar *rgbaBufp,
int rgbaBufSize)
{
int rgbPoint = 0, rgbaPoint;
for (rgbaPoint = 0; rgbaPoint < rgbaBufSize; rgbaPoint += 4)
{
rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint];
rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint + 1];
rgbBufp[rgbPoint++] = rgbaBufp[rgbaPoint + 2];
}
}
/*
* sendBMPToPIKA
*
* Take the captured data and send it across
* to PIKA.
*/
static void
sendBMPToGimp (HBITMAP hBMP,
HDC hDC,
RECT rect)
{
int width, height;
int imageType, layerType;
PikaImage *new_image;
PikaLayer *layer;
GeglBuffer *buffer;
GeglRectangle *rectangle;
/* Our width and height */
width = (rect.right - rect.left);
height = (rect.bottom - rect.top);
/* Check that we got the memory */
if (!capBytes)
{
g_message (_("No data captured"));
return;
}
/* Flip the red and blue bytes */
flipRedAndBlueBytes (width, height);
/* Set up the image and layer types */
imageType = PIKA_RGB;
layerType = PIKA_RGB_IMAGE;
/* Create the PIKA image and layers */
new_image = pika_image_new (width, height, imageType);
layer = pika_layer_new (new_image, _("Background"),
ROUND4 (width), height,
layerType,
100,
pika_image_get_default_new_layer_mode (new_image));
pika_image_insert_layer (new_image, layer, NULL, 0);
/* make rectangle */
rectangle = g_new (GeglRectangle, 1);
rectangle->x = 0;
rectangle->y = 0;
rectangle->width = ROUND4(width);
rectangle->height = height;
/* get the buffer */
buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (layer));
/* fill the buffer */
gegl_buffer_set (buffer, rectangle, 0, NULL, (guchar *) capBytes,
GEGL_AUTO_ROWSTRIDE);
/* flushing data */
gegl_buffer_flush (buffer);
/* Now resize the layer down to the correct size if necessary. */
if (width != ROUND4 (width))
{
pika_layer_resize (layer, width, height, 0, 0);
pika_image_resize (new_image, width, height, 0, 0);
}
*image = new_image;
return;
}
/*
* doNonRootWindowCapture
*
* Capture a selected window.
* ENTRY POINT FOR WINSNAP NONROOT
*
*/
static int
doWindowCapture (void)
{
/* Start up a standard Win32
* message handling loop for
* selection of the window
* to be captured
*/
return winsnapWinMain ();
}
/******************************************************************
* Debug stuff
******************************************************************/
/*
* formatWindowsError
*
* Format the latest Windows error message into
* a readable string. Store in the provided
* buffer.
*/
static void
formatWindowsError (char *buffer,
int buf_size)
{
LPVOID lpMsgBuf;
/* Format the message */
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf, 0, NULL );
/* Copy to the buffer */
g_strlcpy (buffer, lpMsgBuf, buf_size);
LocalFree(lpMsgBuf);
}
/******************************************************************
* Bitmap capture and handling
******************************************************************/
/*
* primDoWindowCapture
*
* The primitive window capture functionality. Accepts
* the two device contexts and the rectangle to be
* captured.
*/
static HBITMAP
primDoWindowCapture (HDC hdcWindow,
HDC hdcCompat,
RECT rect)
{
HBITMAP hbmCopy;
HGDIOBJ oldObject;
BITMAPINFO bmi;
int width = (rect.right - rect.left);
int height = (rect.bottom - rect.top);
/* Create the bitmap info header */
bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = ROUND4(width);
bmi.bmiHeader.biHeight = -height;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 24;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = 0;
bmi.bmiHeader.biXPelsPerMeter =
bmi.bmiHeader.biYPelsPerMeter = 0;
bmi.bmiHeader.biClrUsed = 0;
bmi.bmiHeader.biClrImportant = 0;
/* Create the bitmap storage space */
hbmCopy = CreateDIBSection (hdcCompat,
(BITMAPINFO *) &bmi,
DIB_RGB_COLORS,
(void **)&capBytes, NULL, 0);
if (!hbmCopy)
{
formatWindowsError(buffer, sizeof buffer);
g_error("Error creating DIB section: %s", buffer);
return NULL;
}
/* Select the bitmap into the compatible DC. */
oldObject = SelectObject (hdcCompat, hbmCopy);
if (!oldObject)
{
formatWindowsError (buffer, sizeof buffer);
g_error ("Error selecting object: %s", buffer);
return NULL;
}
/* Copy the data from the application to the bitmap. Even if we did
* round up the width, BitBlt only the actual data.
*/
if (!BitBlt(hdcCompat, 0,0,
width, height,
hdcWindow, rect.left, rect.top,
SRCCOPY))
{
formatWindowsError (buffer, sizeof buffer);
g_error ("Error copying bitmap: %s", buffer);
return NULL;
}
/* Draw mouse pointer over screenshot if option was selected */
if (capturePointer)
{
CURSORINFO pointer = { sizeof (pointer) };
GetCursorInfo (&pointer);
DrawIcon (hdcCompat, pointer.ptScreenPos.x, pointer.ptScreenPos.y, GetCursor());
}
/* Restore the original object */
SelectObject (hdcCompat, oldObject);
return hbmCopy;
}
static BOOL CALLBACK
GetAccurateWindowRect_MonitorEnumProc (HMONITOR hMonitor,
HDC hdcMonitor,
LPRECT lprcMonitor,
LPARAM dwData)
{
RECT **rectScreens = (RECT**) dwData;
if (!lprcMonitor) return FALSE;
if (! (*rectScreens))
*rectScreens = (RECT*) g_malloc (sizeof (RECT)*(rectScreensCount+1));
else
*rectScreens = (RECT*) g_realloc (*rectScreens,
sizeof (RECT)*(rectScreensCount+1));
if (*rectScreens == NULL)
{
rectScreensCount = 0;
return FALSE;
}
(*rectScreens)[rectScreensCount] = *lprcMonitor;
rectScreensCount++;
return TRUE;
}
static BOOL
GetAccurateWindowRect (HWND hwndTarget,
RECT *outRect)
{
HRESULT dwmResult;
WINDOWPLACEMENT windowplacment;
ZeroMemory (outRect, sizeof (RECT));
/* First we try to get the rect using the dwm api. it will also avoid us from doing more ugly fixes when the window is maximized */
if (LoadRequiredDwmFunctions ())
{
dwmResult = DwmGetWindowAttribute (hwndTarget, DWMWA_EXTENDED_FRAME_BOUNDS, (PVOID) outRect, sizeof (RECT));
UnloadRequiredDwmFunctions ();
if (dwmResult == S_OK) return TRUE;
}
/* In this case, we did not got the rect from the dwm api so we try to get the rect with the normal function */
if (GetWindowRect (hwndTarget, outRect))
{
/* If the window is maximized then we need and can fix the rect variable
* (we need to do this if the rect isn't coming from dwm api)
*/
ZeroMemory (&windowplacment, sizeof (WINDOWPLACEMENT));
if (GetWindowPlacement (hwndTarget, &windowplacment) && windowplacment.showCmd == SW_SHOWMAXIMIZED)
{
RECT *rectScreens = NULL;
int xCenter;
int yCenter;
int i;
/* If this is not the first time we call this function for some
* reason then we reset the rectScreens count
*/
if (rectScreensCount)
rectScreensCount = 0;
/* Get the screens rects */
EnumDisplayMonitors (NULL, NULL, GetAccurateWindowRect_MonitorEnumProc,
(LPARAM) &rectScreens);
/* If for some reason the array size is 0 then we fill it with the desktop rect */
if (! rectScreensCount)
{
rectScreens = (RECT*) g_malloc (sizeof (RECT));
if (! GetWindowRect (GetDesktopWindow (), rectScreens))
{
/* error: could not get rect screens */
g_free (rectScreens);
return FALSE;
}
rectScreensCount = 1;
}
xCenter = outRect->left + (outRect->right - outRect->left) / 2;
yCenter = outRect->top + (outRect->bottom - outRect->top) / 2;
/* find on which screen the window exist */
for (i = 0; i < rectScreensCount; i++)
if (xCenter > rectScreens[i].left && xCenter < rectScreens[i].right &&
yCenter > rectScreens[i].top && yCenter < rectScreens[i].bottom)
break;
if (i == rectScreensCount)
/* Error: did not found on which screen the window exist */
return FALSE;
if (rectScreens[i].left > outRect->left) outRect->left = rectScreens[i].left;
if (rectScreens[i].right < outRect->right) outRect->right = rectScreens[i].right;
if (rectScreens[i].top > outRect->top) outRect->top = rectScreens[i].top;
if (rectScreens[i].bottom < outRect->bottom) outRect->bottom = rectScreens[i].bottom;
g_free (rectScreens);
}
return TRUE;
}
return FALSE;
}
gboolean isDwmCompositionEnabled (void)
{
HRESULT err;
BOOL result;
if (LoadRequiredDwmFunctions ())
{
err = DwmIsCompositionEnabled (&result);
if (err != S_OK)
{
return FALSE;
}
return result;
}
return FALSE;
}
/*
* doCapture
*
* Do the capture. Accepts the window
* handle to be captured or the NULL value
* to specify the root window.
*/
static gboolean
doCapture (HWND selectedHwnd)
{
RECT rect;
/* Try and get everything out of the way before the
* capture.
*/
Sleep (500 + winsnapvals.delay * 1000);
/* Are we capturing a window or the whole screen */
if (selectedHwnd)
{
gboolean compositionEnabled;
if (! GetAccurateWindowRect (selectedHwnd, &rect))
/* For some reason it works only if we return here TRUE. strange... */
return TRUE;
/* First try to capture the window with the magnification api.
* This will solve the bug https://bugzilla.gnome.org/show_bug.cgi?id=793722/
*/
compositionEnabled = isDwmCompositionEnabled ();
if (! (compositionEnabled && doCaptureMagnificationAPI (selectedHwnd, rect)))
{
/* If for some reason this capture method failed then
* capture the window with the normal method:
*/
HWND previousHwnd = GetForegroundWindow ();
gboolean success;
SetForegroundWindow (selectedHwnd);
BringWindowToTop (selectedHwnd);
success = doCaptureBitBlt (selectedHwnd, rect);
if (previousHwnd)
SetForegroundWindow (previousHwnd);
return success;
}
return TRUE;
}
else
{
/* Get the screen's rectangle */
rect.top = GetSystemMetrics (SM_YVIRTUALSCREEN);
rect.bottom = GetSystemMetrics (SM_YVIRTUALSCREEN) + GetSystemMetrics (SM_CYVIRTUALSCREEN);
rect.left = GetSystemMetrics (SM_XVIRTUALSCREEN);
rect.right = GetSystemMetrics (SM_XVIRTUALSCREEN) + GetSystemMetrics (SM_CXVIRTUALSCREEN);
return doCaptureBitBlt (selectedHwnd, rect);
}
return FALSE; /* we should never get here... */
}
static gboolean
doCaptureBitBlt (HWND selectedHwnd,
RECT rect)
{
HDC hdcSrc;
HDC hdcCompat;
HBITMAP hbm;
/* Get the device context for the whole screen
* even if we just want to capture a window.
* this will allow to capture applications that
* don't render to their main window's device
* context (e.g. browsers).
*/
hdcSrc = CreateDC (TEXT("DISPLAY"), NULL, NULL, NULL);
if (!hdcSrc)
{
formatWindowsError(buffer, sizeof buffer);
g_error ("Error getting device context: %s", buffer);
return FALSE;
}
hdcCompat = CreateCompatibleDC (hdcSrc);
if (!hdcCompat)
{
formatWindowsError (buffer, sizeof buffer);
g_error ("Error getting compat device context: %s", buffer);
return FALSE;
}
/* Do the window capture */
hbm = primDoWindowCapture (hdcSrc, hdcCompat, rect);
if (!hbm)
return FALSE;
/* Release the device context */
ReleaseDC(selectedHwnd, hdcSrc);
if (hbm == NULL) return FALSE;
sendBMPToPika (hbm, hdcCompat, rect);
return TRUE;
}
static void
doCaptureMagnificationAPI_callback (HWND hwnd,
void *srcdata,
MAGIMAGEHEADER srcheader,
void *destdata,
MAGIMAGEHEADER destheader,
RECT unclipped,
RECT clipped,
HRGN dirty)
{
if (!srcdata) return;
capBytes = (guchar*) malloc (sizeof (guchar)*srcheader.cbSize);
rgbaToRgbBytes (capBytes, srcdata, srcheader.cbSize);
returnedSrcheader = srcheader;
}
static BOOL
isWindowIsAboveCaptureRegion (HWND hwndWindow,
RECT rectCapture)
{
RECT rectWindow;
ZeroMemory (&rectWindow, sizeof (RECT));
if (!GetWindowRect (hwndWindow, &rectWindow)) return FALSE;
if (
(
(rectWindow.left >= rectCapture.left && rectWindow.left < rectCapture.right)
||
(rectWindow.right <= rectCapture.right && rectWindow.right > rectCapture.left)
||
(rectWindow.left <= rectCapture.left && rectWindow.right >= rectCapture.right)
)
&&
(
(rectWindow.top >= rectCapture.top && rectWindow.top < rectCapture.bottom)
||
(rectWindow.bottom <= rectCapture.bottom && rectWindow.bottom > rectCapture.top)
||
(rectWindow.top <= rectCapture.top && rectWindow.bottom >= rectCapture.bottom)
)
)
return TRUE;
else
return FALSE;
}
static gboolean
doCaptureMagnificationAPI (HWND selectedHwnd,
RECT rect)
{
HWND hwndMag;
HWND hwndHost;
HWND nextWindow;
HWND excludeWins[24];
RECT round4Rect;
int excludeWinsCount = 0;
int magStyles;
if (!LoadMagnificationLibrary ()) return FALSE;
if (!MagInitialize ()) return FALSE;
round4Rect = rect;
round4Rect.right = round4Rect.left + ROUND4(round4Rect.right - round4Rect.left);
/* Create the host window that will store the mag child window */
hwndHost = CreateWindowEx (0x08000000 | 0x080000 | 0x80 | 0x20, APP_NAME, NULL, 0x80000000,
0, 0, 0, 0, NULL, NULL, GetModuleHandleW (NULL), NULL);
if (!hwndHost)
{
MagUninitialize ();
return FALSE;
}
SetLayeredWindowAttributes (hwndHost, (COLORREF)0, (BYTE)255, (DWORD)0x02);
magStyles = WS_CHILD;
if (capturePointer)
magStyles |= MS_SHOWMAGNIFIEDCURSOR;
/* Create the mag child window inside the host window */
hwndMag = CreateWindow (WC_MAGNIFIER, TEXT ("MagnifierWindow"),
magStyles,
0, 0, round4Rect.right - round4Rect.left, round4Rect.bottom - round4Rect.top,
hwndHost, NULL, GetModuleHandleW (NULL), NULL);
/* Set the callback function that will be called by the api to get the pixels */
if (!MagSetImageScalingCallback (hwndMag, (MagImageScalingCallback)doCaptureMagnificationAPI_callback))
{
DestroyWindow (hwndHost);
MagUninitialize ();
return FALSE;
}
/* Add only windows that above the target window */
for (nextWindow = GetNextWindow (selectedHwnd, GW_HWNDPREV); nextWindow != NULL; nextWindow = GetNextWindow (nextWindow, GW_HWNDPREV))
if (isWindowIsAboveCaptureRegion (nextWindow, rect))
{
excludeWins[excludeWinsCount++] = nextWindow;
/* This api can't work with more than 24 windows. we stop on the 24 window */
if (excludeWinsCount >= 24) break;
}
if (excludeWinsCount)
MagSetWindowFilterList (hwndMag, MW_FILTERMODE_EXCLUDE, excludeWinsCount, excludeWins);
/* Call the api to capture the window */
capBytes = NULL;
if (!MagSetWindowSource (hwndMag, round4Rect) || !capBytes)
{
DestroyWindow (hwndHost);
MagUninitialize ();
return FALSE;
}
/* Send it to Pika */
sendBMPToPika (NULL, NULL, rect);
DestroyWindow (hwndHost);
MagUninitialize ();
return TRUE;
}
/******************************************************************
* Win32 entry point and setup...
******************************************************************/
#define DINV 3
/*
* highlightWindowFrame
*
* Highlight (or unhighlight) the specified
* window handle's frame.
*/
static void
highlightWindowFrame (HWND hWnd)
{
HDC hdc;
RECT rc;
if (!IsWindow (hWnd))
return;
hdc = GetWindowDC (hWnd);
GetWindowRect (hWnd, &rc);
OffsetRect (&rc, -rc.left, -rc.top);
if (!IsRectEmpty (&rc))
{
PatBlt (hdc, rc.left, rc.top, rc.right-rc.left, DINV, DSTINVERT);
PatBlt (hdc, rc.left, rc.bottom-DINV, DINV, -(rc.bottom-rc.top-2*DINV),
DSTINVERT);
PatBlt (hdc, rc.right-DINV, rc.top+DINV, DINV, rc.bottom-rc.top-2*DINV,
DSTINVERT);
PatBlt (hdc, rc.right, rc.bottom-DINV, -(rc.right-rc.left), DINV,
DSTINVERT);
}
ReleaseDC (hWnd, hdc);
UpdateWindow (hWnd);
}
/*
* setCaptureType
*
* Set the capture type. Should be one of:
* SELECT_FRAME
* SELECT_CLIENT
* SELECT_WINDOW
*/
void
setCaptureType (int capType)
{
captureType = capType;
}
/*
* myWindowFromPoint
*
* Map to the appropriate window from the
* specified point. The chosen window is
* based on the current capture type.
*/
static HWND
myWindowFromPoint (POINT pt)
{
HWND myHwnd;
HWND nextHwnd;
switch (captureType)
{
case SELECT_FRAME:
case SELECT_CLIENT:
nextHwnd = WindowFromPoint (pt);
do {
myHwnd = nextHwnd;
nextHwnd = GetParent (myHwnd);
} while (nextHwnd);
return myHwnd;
break;
case SELECT_WINDOW:
return WindowFromPoint (pt);
break;
}
return WindowFromPoint (pt);
}
/*
* dialogProc
*
* The window procedure for the window
* selection dialog box.
*/
BOOL CALLBACK
dialogProc (HWND hwndDlg,
UINT msg,
WPARAM wParam,
LPARAM lParam)
{
static int mouseCaptured;
static int buttonDown;
static HCURSOR oldCursor;
static RECT bitmapRect;
static HWND highlightedHwnd = NULL;
switch (msg)
{
case WM_INITDIALOG:
{
int nonclientHeight;
HWND hwndGroup;
RECT dlgRect;
RECT clientRect;
RECT groupRect;
BITMAP bm;
/* Set the mouse capture flag */
buttonDown = 0;
mouseCaptured = 0;
/* Calculate the bitmap dimensions */
GetObject (iconInfo.hbmMask, sizeof(BITMAP), (VOID *)&bm);
/* Calculate the dialog window dimensions */
GetWindowRect (hwndDlg, &dlgRect);
/* Calculate the group box dimensions */
hwndGroup = GetDlgItem(hwndDlg, IDC_GROUP);
GetWindowRect (hwndGroup, &groupRect);
OffsetRect (&groupRect, -dlgRect.left, -dlgRect.top);
/* The client's rectangle */
GetClientRect (hwndDlg, &clientRect);
/* The non-client height */
nonclientHeight = (dlgRect.bottom - dlgRect.top) -
(clientRect.bottom - clientRect.top);
/* Calculate the bitmap rectangle */
bitmapRect.top = ((groupRect.top + groupRect.bottom) / 2) -
(bm.bmHeight / 2);
bitmapRect.top -= nonclientHeight;
bitmapRect.bottom = bitmapRect.top + bm.bmHeight;
bitmapRect.left = ((groupRect.left + groupRect.right) / 2) - (bm.bmWidth / 2);
bitmapRect.right = bitmapRect.left + bm.bmWidth;
}
break;
case WM_LBUTTONDOWN:
/* Track the button down state */
buttonDown = 1;
break;
case WM_LBUTTONUP:
buttonDown = 0;
/* If we have mouse captured
* we do this stuff.
*/
if (mouseCaptured)
{
HWND selectedHwnd;
POINT cursorPos;
/* Release the capture */
mouseCaptured = 0;
SetCursor (oldCursor);
ReleaseCapture ();
/* Remove the highlight */
if (highlightedHwnd)
highlightWindowFrame (highlightedHwnd);
RedrawWindow (hwndDlg, NULL, NULL, RDW_INVALIDATE);
/* Return the selected window */
GetCursorPos (&cursorPos);
selectedHwnd = myWindowFromPoint (cursorPos);
EndDialog (hwndDlg, (INT_PTR) selectedHwnd);
}
break;
case WM_MOUSEMOVE:
/* If the mouse is captured, show
* the window which is tracking
* under the mouse position.
*/
if (mouseCaptured)
{
HWND currentHwnd;
POINT cursorPos;
/* Get the window */
GetCursorPos (&cursorPos);
currentHwnd = myWindowFromPoint (cursorPos);
/* Do the highlighting */
if (highlightedHwnd != currentHwnd)
{
if (highlightedHwnd)
highlightWindowFrame (highlightedHwnd);
if (currentHwnd)
highlightWindowFrame (currentHwnd);
highlightedHwnd = currentHwnd;
}
/* If the mouse has not been captured,
* try to figure out if we should capture
* the mouse.
*/
}
else if (buttonDown)
{
POINT cursorPos;
/* Get the current client position */
GetCursorPos (&cursorPos);
ScreenToClient (hwndDlg, &cursorPos);
/* Check if within the rectangle formed
* by the bitmap
*/
if (PtInRect (&bitmapRect, cursorPos)) {
mouseCaptured = 1;
oldCursor = SetCursor (selectCursor);
SetCapture (hwndDlg);
RedrawWindow (hwndDlg, NULL, NULL, RDW_INVALIDATE | RDW_ERASE);
}
}
break;
case WM_PAINT:
{
HDC hDC;
PAINTSTRUCT ps;
/* If the mouse is not captured draw
* the cursor image
*/
if (!mouseCaptured)
{
hDC = BeginPaint (hwndDlg, &ps);
DrawIconEx (hDC, bitmapRect.left, bitmapRect.top, selectCursor,
0, 0, 0, NULL, DI_NORMAL);
EndPaint (hwndDlg, &ps);
}
}
break;
case WM_COMMAND:
/* Handle the cancel button */
switch (LOWORD (wParam))
{
case IDCANCEL:
EndDialog (hwndDlg, 0);
return TRUE;
break;
}
}
return FALSE;
}
///* Don't use the normal WinMain from pika.h */
//#define WinMain WinMain_no_thanks
//MAIN()
//#undef WinMain
/*
* WinMain
*
* The standard pika plug-in WinMain won't quite cut it for
* this plug-in.
*/
//int APIENTRY
//WinMain(HINSTANCE hInstance,
// HINSTANCE hPrevInstance,
// LPSTR lpCmdLine,
// int nCmdShow)
//{
// /*
// * Normally, we would do all of the Windows-ish set up of
// * the window classes and stuff here in WinMain. But,
// * the only time we really need the window and message
// * queues is during the plug-in run. So, all of that will
// * be done during run(). This avoids all of the Windows
// * setup stuff for the query(). Stash the instance handle now
// * so it is available from the run() procedure.
// */
// hInst = hInstance;
//
// /*
// * Now, call pika_main... This is what the normal WinMain()
// * would do.
// */
//// return pika_main(&PLUG_IN_INFO, __argc, __argv);
//}
/*
* InitApplication
*
* Initialize window data and register the window class
*/
BOOL
InitApplication (HINSTANCE hInstance)
{
WNDCLASS wc;
BOOL retValue;
/* Get some resources */
#ifdef _MSC_VER
/* For some reason this works only with MSVC */
selectCursor = LoadCursor (hInstance, MAKEINTRESOURCE(IDC_SELECT));
#else
selectCursor = LoadCursor (NULL, IDC_CROSS);
#endif
GetIconInfo (selectCursor, &iconInfo);
/*
* Fill in window class structure with parameters to describe
* the main window.
*/
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC) WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
wc.lpszClassName = APP_NAME;
wc.lpszMenuName = NULL;
/* Register the window class and stash success/failure code. */
retValue = RegisterClass (&wc);
/* Log error */
if (!retValue)
{
formatWindowsError (buffer, sizeof buffer);
g_error ("Error registering class: %s", buffer);
return retValue;
}
return retValue;
}
/*
* InitInstance
*
* Create the main window for the application.
*/
BOOL
InitInstance (HINSTANCE hInstance,
int nCmdShow)
{
HINSTANCE User32Library = LoadLibraryW (L"user32.dll");
if (User32Library)
{
typedef BOOL (WINAPI* SET_PROC_DPI_AWARE)();
SET_PROC_DPI_AWARE SetProcessDPIAware;
/* This line fix bug: https://bugzilla.gnome.org/show_bug.cgi?id=796121#c4 */
SetProcessDPIAware = (SET_PROC_DPI_AWARE) GetProcAddress (User32Library,
"SetProcessDPIAware");
if (SetProcessDPIAware)
SetProcessDPIAware();
FreeLibrary (User32Library);
}
/* Create our window */
mainHwnd = CreateWindow (APP_NAME, APP_NAME, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0,
NULL, NULL, hInstance, NULL);
if (!mainHwnd)
{
return (FALSE);
}
ShowWindow (mainHwnd, nCmdShow);
UpdateWindow (mainHwnd);
return TRUE;
}
/*
* winsnapWinMain
*
* This is the function that represents the code that
* would normally reside in WinMain (see above). This
* function will get called during run() in order to set
* up the windowing environment necessary for WinSnap to
* operate.
*/
int
winsnapWinMain (void)
{
MSG msg;
/* Perform instance initialization */
if (!InitApplication (hInst))
return (FALSE);
/* Perform application initialization */
if (!InitInstance (hInst, SHOW_WINDOW))
return (FALSE);
/* Main message loop */
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
return (msg.wParam);
}
/*
* WndProc
*
* Process window message for the main window.
*/
LRESULT CALLBACK
WndProc (HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
HWND selectedHwnd;
switch (message)
{
case WM_CREATE:
/* The window is created... Send the capture message */
PostMessage (hwnd, WM_DOCAPTURE, 0, 0);
break;
case WM_DOCAPTURE:
/* Get the selected window handle */
selectedHwnd = (HWND) DialogBox (hInst, MAKEINTRESOURCE(IDD_SELECT),
hwnd, (DLGPROC) dialogProc);
if (selectedHwnd)
doCapture (selectedHwnd);
PostQuitMessage (selectedHwnd != NULL);
break;
case WM_DESTROY:
PostQuitMessage (0);
break;
default:
return (DefWindowProc (hwnd, message, wParam, lParam));
}
return 0;
}
#endif /* G_OS_WIN32 */