gfx_image_info.c

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/* function to get information about FB image buffers. */

#include "fb_gfx.h"


FBCALL int fb_GfxImageInfo( void *img,
                                                        int *width,     int *height,
                                                        int *bpp,       int *pitch,     void **imgdata, 
                                                        int *size)
{
        PUT_HEADER *header;
        int bpp_, width_, height_, pitch_, headerSize_;

        header = (PUT_HEADER *)img;

        if (!header || header->type == 0)
        {
                *width = *height = *bpp = *pitch = *size = -1;
                *imgdata = NULL;
                return fb_ErrorSetNum(FB_RTERROR_ILLEGALFUNCTIONCALL);
        }
        else if (header->type == PUT_HEADER_NEW) {
                bpp_        = header->bpp;
                width_      = header->width;
                height_     = header->height;
                pitch_      = header->pitch;
                headerSize_ = sizeof(PUT_HEADER);
        }
        else {
                bpp_        = header->old.bpp;
                width_      = header->old.width;
                height_     = header->old.height;
                pitch_      = width_ * bpp_;
                headerSize_ = 4;
        }

        *width   = width_;
        *height  = height_;
        *bpp     = bpp_;
        *pitch   = pitch_;
        *imgdata = img + headerSize_;
        *size    = headerSize_ + (pitch_ * height_);

        return fb_ErrorSetNum( FB_RTERROR_OK );
}