Solved

PlgBlt(..)  transparency Parameter

Posted on 2000-04-17
1
541 Views
Last Modified: 2013-11-20
When using PlgBlt:

pDC->PlgBlt(currentImagePoints, &memDC, 0, 0, 66, 80, CBitmap(), 0, 0);

I get just an ordinary sprite (contained in the memDC).  But instead, i want to use the transparency mask parameter and replace the above CBitmap()  parameter with my monocrome mask.

The problem however is that it's not displaying the sprite at all whatsoever now.  When i try shrinking the size of the mask bitmap (so that it is smaller than the bitmap contained in memDC), the sprite to be displayed to the screen is still invisible!

The mask that i tried making was done as follows:
- Loaded Photoshop
- Opened the bimap that contains the sprite (red in the transparency area)
- went to mode and selected Grey Scale
- saved the bitmap with the name mask.bmp

The mask is specified to be monocrome in the MSDN library.

Could you give any suggestions as to why the sprite is always invisible no matter what?  What can i do to fix this?

- Thanks
0
Comment
Question by:Chains
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 31

Accepted Solution

by:
Zoppo earned 50 total points
ID: 2725661
Hi Chains,

>The mask is specified to be monocrome in the MSDN library.
That's correct and I think that may be your problem. 'monocrome' means 1 bit per pixel, only black/white. A grayscaled image may have 8bit or more.

BTW, what's the return value of the PlgBlt-call?

ZOPPO
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Whole sheet autoscrub still needed 19 54
sumDigits challenge 9 178
firstChar challenge 13 149
Message not shown 5 104
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question