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Cristian Peța

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Everything posted by Cristian Peța

  1. Cristian Peța

    pixel-perfect bitmap FMX app

    Actually I changed my code some years ago and now I'm painting on a bitmap scaled with Canvas.Scale (an UI Canvas) and then use Canvas.DrawBitmap() to draw UI.
  2. Cristian Peța

    pixel-perfect bitmap FMX app

    If you meant using TCanvas, this was possible at least when mobile compilers rolled out. The way to do this changed a little over time but now you need to apply a transformation matrix to the canvas to reverse scaling and all you paint using canvas will match 1:1. There was needed also a translation of (-0.5, -0.5) in that matrix because you needed to use (0.5, 0.5) to use only one pixel. I don't know if this is the case also now.
  3. @Schokohase if you are speaking about my suggestion to read bigger chunks from DB then this is not exactly parallelization. And the second suggestion was about what to optimize. If reading from DB takes 10ms and rendering 0.1ms per piece then I would not care about rendering.
  4. First you need to know much time takes GetTitleFromDB and RenderTitleToBitmap32. Then you will know where to optimize. For SQL servers hawing many small requests is costly. I don't know how much KB GetTitleFromDB is asking but generally reducing the number of requests (bigger data chunks) is better for client and for server also.
  5. If GetTitleFromDB() is using more DB connections and is multi-threaded and if this function is the main bottleneck then it makes sense to parallelize this for loop. Otherwise you can test but I think it will be no gain or even worse because LargeImage will not execute anything in parallel. Looking is per instance and you have only one instance.
  6. Cristian Peța

    No more Transparent Forms on Android, now they are black

    https://community.embarcadero.com/blogs/entry/simulating-transparent-dialog-on-firemonkey-mobile?utm_source=DeveloperNewsletter&utm_medium=Email&utm_content=Newsletter_25
  7. Cristian Peța

    Read on mobile

    There are four buttons on top-right corner. I use the second button that is like a file. It will show the unread content. P.S. I prefer also "condensed" mode.
  8. Cristian Peța

    Delphi 10.3 and supported version of Android

    @Dalija Prasnikar in the "Platform Status" says that it's Android 5 (API 21) http://docwiki.embarcadero.com/PlatformStatus/en/Main_Page
  9. I just tried out of curiosity to see unit cycles. Just too much for today Delphi compilers and parsers.
  10. Cristian Peța

    Releasing memory devoted to arrays

    The code you posted can't give any exception. Try for yourself in a new project. And us Uwe Raabe said: static arrays can't be freed manually, nor modify the length. Don't do this. P.S. for string static arrays you can free memory allocated by strings (assign null string or modify length) but not the array itself.
  11. Cristian Peța

    [3D] Why do i need to use negative Y values to go UP?

    Probably because they started from 2D. For screens (0, 0) point is up-left and you need to use positive values to go down. This originates from old TVs where the analog signal starts from up-left.
  12. Cristian Peța

    Strange and Random Access Violations

    It can brake reference counting only if you move() to string. When you only move() from string the string is not affected in any way. Move() doesn't change the source.
  13. Cristian Peța

    Custom Managed Records Coming in Delphi 10.3

    Compiler optimizations can bite sometimes.
  14. Cristian Peța

    Custom Managed Records Coming in Delphi 10.3

    For protection against modifying const parameters the language shouldn't have pointers. When ARC was introduced with iOS compiler there was a warning that in the future pointers can be banned by NEXTGEN compilers. But I don't think this will ever happen.
  15. I don't see any issues after I build camera_shake in 10.2.3 with IDE FixPack. Code completion and others are instant. BTW build time is the same as in 10 Seattle.
  16. Which project have you compiled in 10.2.3? I have an error in TERRA_OGG: function stb_vorbis_get_samples_short_interleaved(f:pvorb; channels:integer; buffer:array of SmallInt; num_shorts:integer):integer; var outputs: TOutput; len,n,z,k,kk,ch:integer; buf:array of SmallInt; begin len := num_shorts div channels; n:=0; kk:=0; z := f.channels; if z>channels then z:=channels; buf:=@buffer[kk]; <---[dcc32 Error] TERRA_OGG.pas(5391): E2010 Incompatible types: 'Dynamic array' and 'Pointer'
  17. First I recommend you to install Andy's IDE FixPack. It will be much better. And I tried to compile in 10 Seattle out of curiosity but: - particles_simple sample does not compile because TERRA_SpriteManager unit is missing. - linetest sample does not compile because TERRA_Scene unit is missing. - camera_shake finally compiles.... And there is soooo much noise at compilation.... a lot of hints and warnings. Someone must clean this before take this project seriously. And 167 kloc in 127 seconds for camera_shake sample (win32)? I have a project with 243 kloc that compiles in 10 seconds on the same machine. I'm not surprised that CodeInsight is so slow. PS. In 10 Seattle CodeInsight is instant after a build (FixPack installed).
  18. Cristian Peța

    Custom Managed Records Coming in Delphi 10.3

    Nice if we optionally can modify the source. For example we can mark that a copy was made or to increment a counter of copies.
  19. Cristian Peța

    Directions for ARC Memory Management

    New.Of() can also be a simple function that returns a record like: function Keep(AObject: TObject): TKeepObjectAndFreeRecord;
  20. Cristian Peța

    Directions for ARC Memory Management

    A record without a reference will stay alive up to routine end? I must test this. .... Just verified in Lazarus and suppose it's similar in Delphi. That record lives on stack up to the routine end.
  21. Cristian Peța

    Directions for ARC Memory Management

    Perhaps that New record must also be declared next to s1. Otherwise how can it go out of scope?
  22. Cristian Peța

    Directions for ARC Memory Management

    I only wanted a simple way to clear my code of that "try finally end" for local, short lived instances. They are the wast majority in my code. For other objects (the minority) I prefer manual memory management and not to fight an automatic one. IShared<T> is nice but a little convoluted.
  23. Cristian Peța

    Directions for ARC Memory Management

    It would be wrong if somewhere is an unsafe reference. But this is true also if using Shared<T> or IShared<T>. Or any other smart pointer.
  24. Cristian Peța

    Directions for ARC Memory Management

    I don't understand what would be wrong to enable ARC for objects and to consider [unsafe] as default. It will not brake old code. And using [safe] or [arc] we can have automatic memory management. At least for simple scenarios.
  25. Cristian Peța

    How to make a component available to all platforms

    I discovered this looking in FMX sources.
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