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This change enables a transparent background for those parts in the screen capture which are not visible on the screen.

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git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@2347 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
This commit is contained in:
RKrom 2012-12-03 13:16:23 +00:00
parent 3a5b3d63a9
commit 03cba68f61
1 changed files with 42 additions and 3 deletions
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45
GreenshotPlugin/Core/WindowCapture.cs
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@ -701,10 +701,49 @@ namespace GreenshotPlugin.Core {
// A suggestion for the "A generic error occurred in GDI+." E_FAIL/0×80004005 error is to re-try...
bool success = false;
ExternalException exception = null;
for(int i = 0; i < 3; i++) {
for (int i = 0; i < 3; i++) {
try {
// assign image to Capture, the image will be disposed there..
returnBitmap = Bitmap.FromHbitmap(hDIBSection);
// Collect all screens inside this capture
List<Screen> screensInsideCapture = new List<Screen>();
foreach (Screen screen in Screen.AllScreens) {
if (screen.Bounds.IntersectsWith(captureBounds)) {
screensInsideCapture.Add(screen);
}
}
// Check all all screens are of an equal size
bool offscreenContent = false;
using (Region captureRegion = new Region(captureBounds)) {
// Exclude every visible part
foreach (Screen screen in screensInsideCapture) {
captureRegion.Exclude(screen.Bounds);
}
// If the region is not empty, we have "offscreenContent"
using (Graphics screenGraphics = Graphics.FromHwnd(User32.GetDesktopWindow())) {
offscreenContent = !captureRegion.IsEmpty(screenGraphics);
}
}
// Check if we need to have a transparent background, needed for offscreen content
if (offscreenContent) {
using (Bitmap tmpBitmap = Bitmap.FromHbitmap(hDIBSection)) {
// Create a new bitmap which has a transparent background
returnBitmap = ImageHelper.CreateEmpty(tmpBitmap.Width, tmpBitmap.Height, PixelFormat.Format32bppArgb, Color.Transparent, tmpBitmap.HorizontalResolution, tmpBitmap.VerticalResolution);
// Content will be copied here
using (Graphics graphics = Graphics.FromImage(returnBitmap)) {
// For all screens copy the content to the new bitmap
foreach (Screen screen in Screen.AllScreens) {
Rectangle screenBounds = screen.Bounds;
// Make sure the bounds are offsetted to the capture bounds
screenBounds.Offset(-captureBounds.X, -captureBounds.Y);
graphics.DrawImage(tmpBitmap, screenBounds, screenBounds.X, screenBounds.Y, screenBounds.Width, screenBounds.Height, GraphicsUnit.Pixel);
}
}
}
} else {
// All screens, which are inside the capture, are of equal size
// assign image to Capture, the image will be disposed there..
returnBitmap = Bitmap.FromHbitmap(hDIBSection);
}
// We got through the capture without exception
success = true;
break;
} catch (ExternalException ee) {