bitblt

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BitBlt performance with Aero enabled

I\'d like to get more performance out of BitBlt for capturing the screen. When Aero remains enabled, capturing only a 400x400 pixel area of the screen reduces capture time from an average of 50ms (ful[详细]

2023-03-30 03:13 分类：问答
How to speed up BitBlt to capture screen with aero?

I use following code to capture the screen with GDI functions: // Prologue: int iScreenWidth = GetSystemMetrics(SM_CXSCREEN);[详细]

2023-03-27 23:15 分类：问答
Control to draw in a window gdi

I have used Visual Basic 6 in the past (LOONG ago), and it had a control called PictureBox where you could just draw stuff to, get a device context if you wanted, etc. I\'m now trying to find out how[详细]

2023-03-07 12:12 分类：问答
Why is the screenshot not drawn onto my window using SelectObject and BitBlt functions?

I am trying to get a 500x500 screenshot from the 0x0 (top-left) position of screen and put it in a window.[详细]

2023-02-20 19:39 分类：问答
Is it possible to BitBlt directly on to a GDI+ bitmap?

I am trying to BitBlt from an HBITMAP to a GDI+ bitmap.I tried this, but nothing happens: Bitmap Buffer = New Bitmap(608, 3开发者_StackOverflow中文版92)[详细]

2023-02-01 19:45 分类：问答
Using BitBlt to capture desktop pixel colors

Right now I\'m using GetPixel() to retrieve about 64 pixels from the desktop in order to obtain their color. I read about GetPixel() being slow but didn\'t think it would matter for a few pixels but i[详细]

2023-02-01 09:52 分类：问答
Crop function BitBlt(...)

I want to create a crop function in an existing engine. This is what I already have: bool Bitmap::Crop(RECT cropArea)[详细]

2023-01-15 22:29 分类：问答
BitBlt in Qt4?

What is开发者_JAVA技巧 the recommended method of copying one QImage into another at a particular position in Qt4?[详细]

2023-01-10 06:36 分类：问答
WinAPI/GDI: why snapshot of large windows includes taskbar?

I am using GDI+ to take window snapshot, the code is: CComBSTR bstrfname (fname); HDC hdc = CreateCompatibleDC (hDC);[详细]

2023-01-06 22:08 分类：问答
SRCCOPY removes transparancy from BITBLITTED IMAGE

BitBlt(meteor.main, 0, 0, meteor.img_width, meteor.img_height, meteor.image,meteor.mask_x, meteor.mask_y, SRCAND);[详细]

2022-12-29 20:51 分类：问答