¿Quién sabe? alphablending 2 bitmaps - Graphics Discussion Boards

Re: (DirectDraw)How to set the color key of an overlay surface(YUY2 16bits)?

linhui4-Dec-08 14:52

linhui

4-Dec-08 14:52

The byte ordering should be Y0, U0, Y1, V0, Y2, U1, Y3, V1...

Calculating Homography

VincentOng2-Dec-08 23:51

VincentOng

2-Dec-08 23:51

Hi all,
I want to calculate the homography assuming i have 4 points in the original image and 4 points in the resulted image.

x' = xH where x' is the points in the resulted image, H is the homography and x is points in the original image. Please help! Thanks!

this.webBrowser1.Document.Body.InnerHtml +=@"&lt br/ &gt" not working

Manish Majithia2-Dec-08 2:41

Manish Majithia

2-Dec-08 2:41

this.webBrowser1.Document.Body.InnerHtml +=@"<br/>"
concatenates <BR> to this.webBrowser1.Document.Body.InnerHtml

I am pretty confused what is happening is it a bug or what?

[wxWidgets] Managing on click mouse event

EternallyConfuzzled1-Dec-08 6:24

EternallyConfuzzled

1-Dec-08 6:24

Hi, Do You know how can the click mouse event be managed ?
In particular I'd like to know if it's possible receive, when I keep pressed the left mouse button, a sequential serie of mouse click events.
I'm interested into this fact because I'd like to implement scrolling in a custom control letting the possibility to scroll keeping pressed the left button with no necessity to click continuosly the mouse button.

Thanks.
Stefano.

Graph layout [OK]

ventomito26-Nov-08 8:05

ventomito

26-Nov-08 8:05

Hello folks,
i'm searching for a class or any sample code to organize a graph (map or network).
I try to explain better, i just want to display a graph in a fine way, clear and well spaced.
Thanks in advance

Program your life ^^

modified on Wednesday, January 7, 2009 3:39 PM

Re: Graph layout

Drew Stainton30-Dec-08 11:49

Drew Stainton

30-Dec-08 11:49

Lookup "simulated annealing" - it's a good algorithm for laying out all kinds of data, from map labels to graphs.

Cheers,
Drew.

Re: Graph layout

ventomito7-Jan-09 9:39

ventomito

7-Jan-09 9:39

Thank you Drew.
Btw i found a great library for whoever need it:
http://jung.sourceforge.net/doc/index.html[^]

It helped me, maybe someone is intersted.
Enrico

Program your life ^^

¿Quién sabe? alphablending 2 bitmaps

Chesnokov Yuriy26-Nov-08 2:00

Chesnokov Yuriy

26-Nov-08 2:00

There 2 32bpp bitmaps with some images:

bitmap1
bitmap2

and graphics object g1 created from bitmap1

I set individualy alpha values in bitmap2 using LockBits:

C++

Gdiplus::BitmapData bitmapData;
Gdiplus::Status s = pBitmap->LockBits(&Gdiplus::Rect(0, 0, pBitmap->GetWidth(), pBitmap->GetHeight()),
                                      Gdiplus::ImageLockModeWrite | Gdiplus::ImageLockModeRead,
                                      PixelFormat32bppRGB, &bitmapData);
if (s == Gdiplus::Ok) {
        unsigned int* pPixels = (unsigned int *)bitmapData.Scan0;
        for (unsigned int i = 0; i < bitmapData.Height; i++) {
                for (unsigned int j = 0; j < bitmapData.Width; j++) {
                        if (mask(i, j) > 0)
                                pPixels[j] &= 0xFFFFFFFF;
                        else
                                pPixels[j] = 0x00FFFFFF;
                }
                pPixels += bitmapData.Stride / 4;
        }
        pBitmap->UnlockBits(&bitmapData);
}

And then draw it on bitmap1 using g1. But the alpha blending does not happen?

chesnokov

Re: ¿Quién sabe? alphablending 2 bitmaps

Mark Salsbery26-Nov-08 5:43

Mark Salsbery

26-Nov-08 5:43

Chesnokov Yuriy wrote:
Gdiplus::Status s = pBitmap->LockBits(&Gdiplus::Rect(0, 0, pBitmap->GetWidth(), pBitmap->GetHeight()),
Gdiplus::ImageLockModeWrite | Gdiplus::ImageLockModeRead,
PixelFormat32bppRGB, &bitmapData);

Shouldn't that be Format32bppArgb?

The pBitmap bitmap must be Format32bppArgb as well.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: ¿Quién sabe? alphablending 2 bitmaps

Chesnokov Yuriy26-Nov-08 19:50

Chesnokov Yuriy

26-Nov-08 19:50

you're the MVP.
Muchos gracias!
I do not believe how can I omited that ARG in this call? They were all ARGB created and cloned, but that single LockBits somehow avoided ARGB. Ohhh

Чесноков

Some problems with DirectSound library

andrei_b25-Nov-08 4:50

andrei_b

25-Nov-08 4:50

Hi! I'm using Visual C++ 2005 Express Edition and I am trying to create an application that uses DirectSound. I found on DirectSound Documentation how to initiate it, but I still have some problems. When I initiate last member of DSBUFFERDESC (the struct that describes the characteristics of a new buffer), i get this error:

1>main.obj : error LNK2019: unresolved external symbol _GUID_NULL 
referenced in function "void __cdecl InitDirectSound(struct HWND__ *)" (?InitDirectSound@@YAXPAUHWND__@@@Z)

Here is the code, where "GUID_NULL" (which is defined in dsound.h) appears:

DSBUFFERDESC pcDSPrimaryBufferDesc,
pcDSPrimaryBufferDesc.guid3DAlgorithm=GUID_NULL;

On my project Propetries>>Configuration Propetries>>Linker>>Input>>ADDITIONAL DEPENDENCIES I added dsound.lib, but on DirectX Documentation it says that some DirectSound functions use Dsound3d.dll as import library. Where should I add it? what did I missed? Frown | :(

Thank you in advance!

Re: Some problems with DirectSound library

Mark Salsbery25-Nov-08 9:16

Mark Salsbery

25-Nov-08 9:16

Member 3796009 wrote:
On my project Propetries>>Configuration Propetries>>Linker>>Input>>ADDITIONAL DEPENDENCIES I added dsound.lib

Try adding Dxguid.lib as well.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

help! usb camera filter Driver

hongqibudao24-Nov-08 14:29

hongqibudao

24-Nov-08 14:29

I want to write a filter Driver for usb camera, but i don't how to do. anyone can help me? my email : forever_28@yahoo.cn

Re: help! usb camera filter Driver

Smithers-Jones14-Jan-09 23:13

Smithers-Jones

14-Jan-09 23:13

I want to build a space ship that flies me to Ganymed, but I don't know how to do. Anyone can help me? my email: forever_dumb@yahoo.cn

Is there an easy way to record and modify whole screen before output?

chenfu23-Nov-08 20:18

chenfu

23-Nov-08 20:18

Hi!
I have some question about vista DWM and related feature.
My project wanna a feature that all output of screen be stored in an offscreen buffer, then a program modify the buffer, for example, twist the screen image or make output brighter or darker, at last the modified result be sent to the real user screen.

It is just something like flip3d in vista.
Do you think it is possible to achieve by using some windows API?
Please give me some suggestion Smile | :)

Thank you!!

problem of Rendering mesh with texture in DirectX 9.0

Md. Ali Naser Khan23-Nov-08 2:14

Md. Ali Naser Khan

23-Nov-08 2:14

I am using directx9 and Visual c++ for my project. I am trying to display a mesh loading from *.x file. The mesh object has texturing object. When I am trying to render the meash there is a background containing one texture from the mesh file. The problem is when I use color blending. If I desable color blending there is no pproblem.

Extract Alpha from .png

Xmen Real 21-Nov-08 5:29

Xmen Real

21-Nov-08 5:29

hi, im trying to extract the alpha image from png image. Instead of using iterations pixel by pixel, is there anyother fast or good way to do this ?

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Zooming bitmap like Paint

jgershonw119-Nov-08 20:31

jgershonw1

19-Nov-08 20:31

I want to zoom in on a bitmap like Paint where the further you zoom in, the larger the individual pixels appear without any interpolation. This is how I thought about doing it. First, I would read the bitmap into an array. Then, I would custom draw each pixel with the appropriate color from the array as squares. The size of the squares would depend on the zoom level. This is probably the worst way of doing it, but I couldn't think of anything else. Maybe, somebody can suggest a better way?

Re: Zooming bitmap like Paint

Alan Balkany20-Nov-08 3:23

Alan Balkany

20-Nov-08 3:23

http://msdn.microsoft.com/en-us/library/yws82c40.aspx[^]

This scales the image for you. Much easier than what you were planning.

Re: Zooming bitmap like Paint

jgershonw120-Nov-08 7:17

jgershonw1

20-Nov-08 7:17

I have tried using DrawImage, but it appears to scale with some sort of interpolation applied. I need to zoom in and see the individual pixels. In other words, the further that you zoom in, the larger a single pixel will be drawn.

Re: Zooming bitmap like Paint

jgershonw120-Nov-08 7:40

jgershonw1

20-Nov-08 7:40

Oh wait, I just saw that I could use NearestNeighbor for the inpterpolation mode. I believe this will solve my problem.

Re: Zooming bitmap like Paint

Randor 20-Nov-08 4:39

Randor

20-Nov-08 4:39

jgershonw1 wrote:
This is probably the worst way of doing it

I would agree with that statement.

You did not mention operating system or what language your writing your application in. If you are using C++ on Windows then you would want to use SetViewportExt[^] and SetWindowExt[^] I believe the .NET equivalent is to use Graphics.PageScale[^]. These functions are changing how GDI converts logical coordinates into device coordinates.

Here are some samples:

http://www.codeproject.com/KB/docview/McCZoomView.aspx[^]

And a .Net sample which utilizes graphics.pagescale:
http://www.codeproject.com/KB/GDI-plus/spheresgdi_.aspx[^]

Best Wishes,
-David Delaune

How to create gif file from bmp using GDI+

sandeepkavade19-Nov-08 18:56

sandeepkavade

19-Nov-08 18:56

Hi I am having 10 bmp files and i want to make 1 gif file out of that using GDI+. Each bmp file should be displayed for particular time period. I searched a lot but unable to find the answer. I want to do it in C++.

How to manage data from Directshow filter?

Van Ly Doc Hanh19-Nov-08 7:11

Van Ly Doc Hanh

19-Nov-08 7:11

Hi all,

I have some problems with directshow filters. I have a device (webcam) that provide some directshow filters for Capture (Source Filter) and Decoder Filter. So with those filters, I can capture and display the video in my local computer.

But I want to get the data from output pin of the Capture filter and using my own RTP stack(symmetric RTP, non-directshow written as a dll) to send it to a remote computer. And in the remote computer, I want to use my RTP stack to receive the video packets and using Decoder Filter to decode the data? So can I do something like that (mixed directshow filters with non-directshow)?

Thank you very much,
DBQ.

Re: How to manage data from Directshow filter?

Mark Salsbery21-Nov-08 6:01

Mark Salsbery

21-Nov-08 6:01

To attach to the output pin of a filter, you'll need to write a filter[^]
or a DMO[^].

I personally use a custom frame grabber filter . The samples
from the grabber filter can be used any way I want, including packaging
and sending on the network.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

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