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Useful SDL_Library for download- Text Formating and rendering


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#1 guadrians   Members   -  Reputation: 106

Posted 31 August 2012 - 11:47 AM

Hello! This is my first post here, hi all!
I was in need of a basic text formater for my project. So I searched the internet. I stumbled upon this post:
http://www.gamedev.n...ng-text-in-sdl/
Sadly, there was no solution for a pure SDL text formating. The solution offered involved the use of OpenGL:
http://www.gamedev.n...tf-with-opengl/

So I made my own library for text formatting.

What it does? It takes as an argument, among other things, a SDL_rect and renders text in that rect.
The text is left aligned. It's quite a raw thing but it works ( it works only with 32bit surfaces). Also, acts as a basic text formatter, removing all spaces if they are at the begining of a line and all but one space if it is between words.
Here's the declaration:

bool TR_render_text(char * font,char * file,SDL_Color font_color,int font_size, SDL_Rect * rect,SDL_Surface * screen, SDL_Surface * destination)


font-font to be loaded. it uses SDL_ttf library
file-text file to be rendered
Color-color of the text
font_size-desired font size
rect-rendering box
screen-this is your main screen SDL_surface(the one you obtained with SDL_SetVideoMode
destination-sdl_surface where you want your text rendered(you can also put screen here). This surface should be create with SDL_CreateRGBSurface like so:
destination=SDL_CreateRGBSurface(SDL_HWSURFACE, screen->w,screen->h,32,screen->format->Rmask,screen->format->Gmask, screen->format->Bmask, screen->format->Amask);


Here's a screenshot of the TR_render_text in action.

Known bugs(so far):
-if the width of the rect is smaller than the actual size of the largest word(rendered word that is) program crashes
-not a bug per se but I noticed that SDL_ttf does not render well some characters, namely an apostroph with a ASCII code 0x92

Also to use this library you will have to install both SDL and SDL_ttf libraries.


If you don't know how to install a library check out Lazy foo tutorial here:
http://lazyfoo.net/S...son03/index.php


Let me know how it works for you!

Attached Files


Edited by guadrians, 31 August 2012 - 11:51 AM.


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#2 guadrians   Members   -  Reputation: 106

Posted 31 August 2012 - 11:52 AM

I can't seem to load a screenshot so here I try again.
SNAG 0001


#3 fastcall22   Crossbones+   -  Reputation: 4375

Posted 31 August 2012 - 03:39 PM

Congratulations on distributing your library!

Unfortunately, it shouldn't be used because it has some glaring issues:
1. The font parameter is a char*. Does this mean the font is loaded (and hopefully unloaded!) after every call? A game cannot afford load and unload fonts every frame. What if I wanted to render the different text with the same font? Is the font loaded twice? (And do you free the surfaces allocated by SDL_TTF after rendering?)
2. The function expects a file. Does this mean that the text file is loaded after every call? What if I just have a string I want to render? Would I need to write it to a file and then pass that filename to the function?
3. There are two SDL_Surface* parameters to render to. Which one do I use? Why should the function care whether or not it is drawing to the screen or the surface I created for it?

Possible solutions:
1. Change the font parameter from a string to a TTF font. In order to have minimal impact on performance, all resource loading should be handled separately of rendering and by a more appropriate manager -- let the user manage the resources.
2. Change the filename parameter to a plain string. Let the user worry about loading the text from disk. By doing so, you stop thrasing the harddrive by constantly writing/loading text to and fro.
3. Remove the screen parameter, just write to the destination parameter. Is there really any difference between writing to the screen and a surface created by a user?
c3RhdGljIGNoYXIgeW91cl9tb21bMVVMTCA8PCA2NF07CnNwcmludGYoeW91cl9tb20sICJpcyBmYXQiKTs=

#4 guadrians   Members   -  Reputation: 106

Posted 31 August 2012 - 05:23 PM

@fastcall22
It's a quick and dirty library which gets the job done for my project and I thought of sharing it...True, it could use with some improvements, but I ain't going to spend any more time on it now.Maybe in future. I focused on my specific needs instead of a more larger view so that's way the issues you highlighted above are present.
1.This is correct, a font is better than char*. Maybe I'll change it.
2.This issue has two faces really. I mean, yeah, to render a string could be useful. Probably will change that too.
3.I need the screen surface to pass parameters to SDL_CreateRGBSurface function. And was useful for debugging.




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