BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Quick Create a big TBitmap          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Daniel Guest Posted: Tue Aug 30, 2005 7:16 am    Post subject: Quick Create a big TBitmap Hi, How to create a very big TBitmap? Let say, bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; It take a long time in allocate memory for bigBmp. Any idea to quickly create a big TBitmap? Thanks. Daniel Back to top Nicholas Sherlock Guest Posted: Tue Aug 30, 2005 7:56 am    Post subject: Re: Quick Create a big TBitmap Daniel wrote: Quote: How to create a very big TBitmap? bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; That is a very big bitmap indeed, and you may have problems working with it (IIRC, some video cards struggle with bitmaps larger than the screen size). You could use Graphics32 library for this - AFAIK, it doesn't have a restriction like this. But having bitmaps this large smells like code that needs a rethink and redesign. Try resizing it as pf1bit, I think it is lighter on resources: bigbmp:=tbitmap.create; bigbmp.pixelformat:=pf1bit; bigbmp.width:=20000; bigbmp.height:=20000; bigbmp.pixelformat:=pf32bit; Cheers, Nicholas Sherlock Back to top Jens Gruschel Guest Posted: Tue Aug 30, 2005 9:00 am    Post subject: Re: Quick Create a big TBitmap Quote: That is a very big bitmap indeed, and you may have problems working with it (IIRC, some video cards struggle with bitmaps larger than the screen size). Yes, especially under Win 9x. Quote: You could use Graphics32 library for this - AFAIK, it doesn't have a restriction like this. Are you sure? TBitmap32 is better than TBitmap for some purposes, but I think it still uses CreateDIBSection to allocate the whole bitmap. Unless you are using tiling and a smart memory manager you are always faced with such limits. Quote: bigbmp:=tbitmap.create; bigbmp.pixelformat:=pf1bit; bigbmp.width:=20000; bigbmp.height:=20000; bigbmp.pixelformat:=pf32bit; Again I doubt this is a good solution. IMO the pixel format should always be set before assigning width / height, if you want to have a DIB. Changing the pixel format after assigning a size means the DDB / DIB has to be converted, which consumes time and (probably) more resources. Jens -- Jens Gruschel http://www.pegtop.net Back to top Francesco Savastano Guest Posted: Tue Aug 30, 2005 11:09 am    Post subject: Re: Quick Create a big TBitmap Quote: How to create a very big TBitmap? Let say, bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; I would never do it...and it will take probably ages even if it could be possible on WinXP You don't need such a giant bitmap, what exactly you want to do?. If you need it for a very large map, then you can create many bitmap blocks of the same size and then write your own engine to update them to screen. This would better fit into a class. The only thing I don't have much experience with is memory mapped files that could also be the solution. for example I think Imageen uses memory mapped TIEBitmap as solution. But 20000x20000x 4bytesPerPixel = about 1,6 GB are you conscious of this? Back to top Jens Gruschel Guest Posted: Tue Aug 30, 2005 11:40 am    Post subject: Re: Quick Create a big TBitmap Quote: I would never do it...and it will take probably ages even if it could be possible on WinXP If you are lucky and your memory isn't too fragmented. Quote: But 20000x20000x 4bytesPerPixel = about 1,6 GB are you conscious of this? Right, I'd try to avoid allocating more than let's say 1 GB of memory on a 32 bit multi tasking operating system. -- Jens Gruschel http://www.pegtop.net Back to top Jens Gruschel Guest Posted: Tue Aug 30, 2005 11:44 am    Post subject: Re: Quick Create a big TBitmap Quote: bigBmp.Width:=20000; bigBmp.Height:=20000; BTW... Photoshop 6 has a limit of 30000x30000, and I successfully created images that large. But I'm pretty sure they are storing such bitmaps as smaller tiles. And they are using a swap disk. I think you need a similar approach to work with such huge bitmaps. Jens -- Jens Gruschel http://www.pegtop.net Back to top Daniel Guest Posted: Tue Aug 30, 2005 3:38 pm    Post subject: Re: Quick Create a big TBitmap Quote: You don't need such a giant bitmap, what exactly you want to do?. I need to search continuous side points of a big color block in a big bitmap. So I have to load whole image at once. Quote: memory mapped files that could also be the solution I think so. I know how to create map file but not know how to load big file directlly into it. Any idea? Regards, Daniel "Francesco Savastano" <francosavastano (AT) TakeThisOutFromAddress (DOT) virgilio.it> ¼¶¼g©ó¶l¥ó·s»D:43143e26$1 (AT) newsgroups (DOT) borland.com... Quote: How to create a very big TBitmap? Let say, bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; I would never do it...and it will take probably ages even if it could be possible on WinXP You don't need such a giant bitmap, what exactly you want to do?. If you need it for a very large map, then you can create many bitmap blocks of the same size and then write your own engine to update them to screen. This would better fit into a class. The only thing I don't have much experience with is memory mapped files that could also be the solution. for example I think Imageen uses memory mapped TIEBitmap as solution. But 20000x20000x 4bytesPerPixel = about 1,6 GB are you conscious of this? Back to top Jens Gruschel Guest Posted: Tue Aug 30, 2005 5:00 pm    Post subject: Re: Quick Create a big TBitmap Quote: I need to search continuous side points of a big color block in a big bitmap. So I have to load whole image at once. What does your algorithmn look like? Can you change it to scanning the bitmap line by line? In that case you only need to have one or two lines in memory at the same time. Quote: I think so. I know how to create map file but not know how to load big file directlly into it. I think you have to write your own bitmap reader. It's not too hard, because the bmp format is pretty simple (unfortunatelly you have to cope with different pixel formats, unless of course you know the pixel format of your files). Take a look at http://www.wotsit.org for more information. Correct me if I'm wrong, but using the WinAPI calls doesn't help, because LoadBitmap etc. do result in the same amount of memory needed. You can use CreateDIBSection with a memory mapped file, but I'm not sure how this will help you. Well, at least you can draw the DIB directly to the screen once you have managed to load the file, but if you are writing your own reader, you don't need a DIB at all (except if your want a DC for processing it). Jens -- Jens Gruschel http://www.pegtop.net Back to top GrandmasterB Guest Posted: Tue Aug 30, 2005 6:01 pm    Post subject: Re: Quick Create a big TBitmap "Daniel" <dan59314 (AT) ms3 (DOT) hinet.net> wrote Quote: I need to search continuous side points of a big color block in a big bitmap. So I have to load whole image at once. You wont need an actual bitmap for this. Rather, load the contents of the bitmap file into a big chunk of memory and work from that. I've done similar things to what you're doing w/ terrain elevation data, and it works well. Back to top Daniel Guest Posted: Wed Aug 31, 2005 2:30 am    Post subject: Re: Quick Create a big TBitmap Hi, Jens and GrandMasterB, Quote: What does your algorithmn look like? Can you change it to scanning the bitmap line by line? The algorithmn I used is not to scan it line by line, that force me must to load all data at once. Maybe splited into tiles also work, but it will need a lot revision. Quote: I think you have to write your own bitmap reader. It's not too hard, I have the source written in C++ . Is there any source in delphi? Quote: You wont need an actual bitmap for this. Rather, load the contents of the bitmap file into a big chunk of memory and work from that. When I create a big TBitmap in runtime, time taked in allocating memory from page file, then the HDD Led lighting for a long time. I wonder it might be stupid and impossible to load whole bitmap quickly at once since HDD pagefile has limit in r/w speed. I may have to consider load it tile by tile. Is there any source that I can load one tile of a big raster file (not only *.bmp, may be *.jpg, *.gif, *.png........)? Thanks for kind reply, Daniel "Daniel" <dan59314 (AT) ms3 (DOT) hinet.net> ¼¶¼g©ó¶l¥ó·s»D:43147d80 (AT) newsgroups (DOT) borland.com... Quote: You don't need such a giant bitmap, what exactly you want to do?. I need to search continuous side points of a big color block in a big bitmap. So I have to load whole image at once. memory mapped files that could also be the solution I think so. I know how to create map file but not know how to load big file directlly into it. Any idea? Regards, Daniel "Francesco Savastano" ¼¶¼g©ó¶l¥ó·s»D:43143e26$1 (AT) newsgroups (DOT) borland.com... How to create a very big TBitmap? Let say, bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; I would never do it...and it will take probably ages even if it could be possible on WinXP You don't need such a giant bitmap, what exactly you want to do?. If you need it for a very large map, then you can create many bitmap blocks of the same size and then write your own engine to update them to screen. This would better fit into a class. The only thing I don't have much experience with is memory mapped files that could also be the solution. for example I think Imageen uses memory mapped TIEBitmap as solution. But 20000x20000x 4bytesPerPixel = about 1,6 GB are you conscious of this? Back to top Daniel Guest Posted: Wed Aug 31, 2005 2:53 am    Post subject: Re: Quick Create a big TBitmap By the way, How can I hide my email account from these articles? Daniel : ( "Daniel" <dan59314 (AT) ms3 (DOT) hinet.net> ¼¶¼g©ó¶l¥ó·s»D:4315161c$1 (AT) newsgroups (DOT) borland.com... Quote: Hi, Jens and GrandMasterB, What does your algorithmn look like? Can you change it to scanning the bitmap line by line? The algorithmn I used is not to scan it line by line, that force me must to load all data at once. Maybe splited into tiles also work, but it will need a lot revision. I think you have to write your own bitmap reader. It's not too hard, I have the source written in C++ . Is there any source in delphi? You wont need an actual bitmap for this. Rather, load the contents of the bitmap file into a big chunk of memory and work from that. When I create a big TBitmap in runtime, time taked in allocating memory from page file, then the HDD Led lighting for a long time. I wonder it might be stupid and impossible to load whole bitmap quickly at once since HDD pagefile has limit in r/w speed. I may have to consider load it tile by tile. Is there any source that I can load one tile of a big raster file (not only *.bmp, may be *.jpg, *.gif, *.png........)? Thanks for kind reply, Daniel "Daniel" <dan59314 (AT) ms3 (DOT) hinet.net> ¼¶¼g©ó¶l¥ó·s»D:43147d80 (AT) newsgroups (DOT) borland.com... You don't need such a giant bitmap, what exactly you want to do?. I need to search continuous side points of a big color block in a big bitmap. So I have to load whole image at once. memory mapped files that could also be the solution I think so. I know how to create map file but not know how to load big file directlly into it. Any idea? Regards, Daniel "Francesco Savastano" [email]francosavastano (AT) TakeThisOutFromAddress (DOT) virgilio.it[/email]> ¼¶¼g©ó¶l¥ó·s»D:43143e26$1 (AT) newsgroups (DOT) borland.com... How to create a very big TBitmap? Let say, bigbmp:=TBitmap.Create; bigBmp.PixelFormat:=pf32bit; bigBmp.Width:=20000; bigBmp.Height:=20000; I would never do it...and it will take probably ages even if it could be possible on WinXP You don't need such a giant bitmap, what exactly you want to do?. If you need it for a very large map, then you can create many bitmap blocks of the same size and then write your own engine to update them to screen. This would better fit into a class. The only thing I don't have much experience with is memory mapped files that could also be the solution. for example I think Imageen uses memory mapped TIEBitmap as solution. But 20000x20000x 4bytesPerPixel = about 1,6 GB are you conscious of this? Back to top Francesco Savastano Guest Posted: Wed Aug 31, 2005 12:03 pm    Post subject: Re: Quick Create a big TBitmap "Daniel" <dan59314 (AT) ms3 (DOT) hinet.net> ha scritto nel messaggio news:43151b79$1 (AT) newsgroups (DOT) borland.com... Quote: By the way, How can I hide my email account from these articles? Daniel : ( Just in your outlook newsgroup preferences specify a fake email address. Back to top Daniel Guest Posted: Fri Sep 02, 2005 12:37 am    Post subject: Re: Quick Create a big TBitmap Thanks. Quote: By the way, How can I hide my email account from these articles? Daniel : ( Just in your outlook newsgroup preferences specify a fake email address. Back to top Michael Rabatscher Guest Posted: Mon Sep 19, 2005 9:50 am    Post subject: Re: Quick Create a big TBitmap An often use approach to search in big Bitmaps (e.g. Sattelite fotos) is a pyramide approach (convert the big image into a smaller one this and repeat the shrinking until a good size has been found). But for this you have to do some preprocessing which consumes some time (creating the picture pyramide). But searching is the a lot faster (search the small image -> found interesting region -> search this region in the bigger image and so on until you find it in the large image). unfortunatly you have to implement some kind of smart bitmap viewer which allows you to import just portions of the file for processing. kind regards Mike Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Graphics All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.