DOCUMENT:Q111729 16-JUL-1999 [win16sdk] TITLE :BUG: StretchBlt() Does Not Perform Palette Translations PRODUCT :Microsoft Windows Software Development Kit PROD/VER:WINDOWS:3.1 OPER/SYS: KEYWORDS:kbOSWin310 _IK kbSDKWin16 ====================================================================== 3.10 WINDOWS kbprg kbbuglist ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows Software Development Kit (SDK) 3.1 ------------------------------------------------------------------------------- SYMPTOMS ======== Normally, the StretchBlt() function performs a palette translation when the destination and source bitmaps do not contain the same color format or palette. When the destination rectangle is the exact size of the source rectangle (no stretching is performed), the palette translation is not performed. CAUSE ===== When the destination and source rectangles are the same size, no stretching is performed and BitBlt() is called to perform a straight copy of the source to the destination. BitBlt() does not perform the palette translation that StretchBlt() does. RESOLUTION ========== You can force StretchBlt() to not call BitBlt() by changing one of the destination rectangle coordinates by one unit. Then, the palette translation will be performed. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. MORE INFORMATION ================ This problem does not occur in Windows NT version 3.1. Additional query words: buglist3.10 3.10 ====================================================================== Keywords : kbOSWin310 _IK kbSDKWin16 Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310 Version : WINDOWS:3.1 Issue type : kbbug Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.