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Writing/Reading bitmap data

Started by programering Mar 17, 2003 at 6:57 AM 4 replies 350+ views

Original Post

Mar 17, 2003 at 6:57 AM

    

struct sequence_data    // the sequence data

{
   short nr_of_frames;     // number of frames in this sequence

   short *frame_indexes;   // an array of frame indexes

};



struct bitmap_data    // the bitmap data

{
   short nr_of_frames;   // number of frames in this bitmap

   SDL_Rect *frames;     // an array of rectangles in this bitmap

   short nr_of_sequences;   // number of sequences in this bitmap

   struct sequence_data *sequences;  // an array of sequences

   SDL_Surface bitmap;    // the image surface

};

Maybe it shall be called collection instead of bitmap? Can I store and get this data in/from a file? Anton Karlsson Klingis Entertainment Games with silly humor [edited by - programering on March 17, 2003 8:00:17 AM]

siaspete

Mar 17, 2003 at 7:10 AM

Not directly since the pointers wouldn''t make any sense when you loaded it in again.

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programering

Author

programering

Mar 18, 2003 at 2:50 AM

How does the SDL_Surface structure looks like?
How is the SDL_Surface structure built up, where''s the pointers in the SDL_Surface structure?
What SDL_Surface/Image data shall I then store in the file?

Anton Karlsson
Klingis Entertainment
Games with silly humor

siaspete

Mar 18, 2003 at 6:34 AM

Wait a minute. How did you get the values in the structure in the first place if you don''t know what they are? Anyway you can check the SDL headers for details of these structures.

I''d recommend not saving structures directly but recreating the steps you did to fill in the structure in the beginning.

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programering

Author

programering

Mar 19, 2003 at 6:07 AM

How shall I do then?

Also I was thinking about different color tables.

A number of different color tables.
Setting up the colors I use in the bitmap.

An example of this:

------color table 0:
color index/id: 0 = green
color index/id: 1 = red
color index/id: 2 = blue
color index/id: 3 = black

------color table 1:
color index/id: 0 = yellow
color index/id: 1 = red
color index/id: 2 = green
color index/id: 3 = black

And then the color index/id structure order in one bitmap frame:

0,3,1,3,2,0
0,1,3,2,3,0
0,1,2,3,2,0
0,1,3,2,1,0
0,3,2,1,2,0

It''s just an example.

Anton Karlsson
Klingis Entertainment
Games with silly humor

programering

Author

programering

Mar 21, 2003 at 4:16 AM

If it looks like this then?

  
 
 
struct sequence_data
{
   // number of frames in this sequence

   short nr_of_frames;
 
   // an array of the bitmap rect indexes

   short *frames;
};
 
 
struct color_table
{
   // an array of color settings

   Uint32 *table;
};
 
 
struct image_data
{
   short width;
   short height;
 
   // an array of color id/index

   // in a structure order

   short *structure;
};
 
 
struct bitmap_collection
{
   // number of bitmaps

   short nr_of_bitmaps;
 
   // an array of rectangles specifying

   // the regions of the bitmaps

   SDL_Rect *bitmaps;
 
   // number of sequences

   short nr_of_sequences;
 
   // an array of sequences

   struct sequence_data *sequences;
 
   // number of colors in the whole image

   short nr_of_colors;
 
   // number of color tables

   short nr_of_color_tables;
 
   // an array of different color tables

   struct color_table *colors;
 
   // the image containing the bitmaps

   struct image_data image;
};

Anton Karlsson
Klingis Entertainment
Games with silly humor

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