nanogui: Pixmaps
Subject:
RE: Pixmaps
From:
Alex Holden ####@####.####
Date:
20 May 1999 19:14:01 -0000
Message-Id: <Pine.LNX.4.04.9905201954180.382-100000@hyperspace>
On Thu, 20 May 1999, Greg Haerr wrote:
> I suggest the following structure:
>
> typedef struct {
> COORD width;
> COORD height;
> int planes;
> int bitsperpixel;
> IMAGEBITS bits[];
> // image data here, optionally followed by color data
> } BITMAP;
>
> In addition, a tag along for palette data:
> int ncolors;
> COLORVAL palette[];
Out of interest, here is the allegro structure. As you can see, it's quite
a bit more advanced, including information about whether to clip it, where
to clip it (relevant to its origin), allows it to be used for the hardware
itself, provides for sub-bitmaps, etc. At least some of these features are
probably useful.
typedef struct BITMAP /* a bitmap structure */
{
int w, h; /* width and height in pixels */
int clip; /* flag if clipping is turned on */
int cl, cr, ct, cb; /* clip left, right, top and bottom
values */
GFX_VTABLE *vtable; /* drawing functions */
void (*write_bank)(void); /* write bank selector, see bank.s */
void (*read_bank)(void); /* read bank selector, see bank.s */
void *dat; /* the memory we allocated for the bitmap
*/
int bitmap_id; /* for identifying sub-bitmaps */
void *extra; /* points to a structure with more info
*/
int x_ofs; /* horizontal offset (for sub-bitmaps) */
int y_ofs; /* vertical offset (for sub-bitmaps) */
int seg; /* bitmap segment */
unsigned char *line[0]; /* pointers to the start of each line */
} BITMAP;
> Since nano-X doesn't have to be completely X-dependent, I don't see
> anything wrong with adding some stuff that's quite a bit more fancy than what
> X supports today. We do have to be worried about breaking too many X api
> calls, though. But, so far, noone has tried to port any X program to nano-X anyway.
I agree.
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: Alex Holden (M1CJD)- Caver, Programmer, Land Rover nut, Radio Ham :
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