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/* Linux driver for Philips webcam
   Various miscellaneous functions and tables.
   (C) 1999-2003 Nemosoft Unv. (webcam@smcc.demon.nl)

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/  

#include <linux/slab.h>

#include "pwc.h"

struct pwc_coord pwc_image_sizes[PSZ_MAX] =
{
        { 128,  96, 0 },
        { 160, 120, 0 },
        { 176, 144, 0 },
        { 320, 240, 0 },
        { 352, 288, 0 },
        { 640, 480, 0 },
};

/* x,y -> PSZ_ */
int pwc_decode_size(struct pwc_device *pdev, int width, int height)
{
        int i, find;

        /* Make sure we don't go beyond our max size */
        if (width > pdev->view_max.x || height > pdev->view_max.y)
                return -1;
        /* Find the largest size supported by the camera that fits into the
           requested size.
         */
        find = -1;
        for (i = 0; i < PSZ_MAX; i++) {
                if (pdev->image_mask & (1 << i)) {
                        if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
                                find = i;
                }
        }
        return find;
}

/* initialize variables depending on type and decompressor*/
void pwc_construct(struct pwc_device *pdev)
{
        switch(pdev->type) {
        case 645:
        case 646:
                pdev->view_min.x = 128;
                pdev->view_min.y =  96;
                pdev->view_max.x = 352;
                pdev->view_max.y = 288;
                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
                pdev->vcinterface = 2;
                pdev->vendpoint = 4;
                pdev->frame_header_size = 0;
                pdev->frame_trailer_size = 0;
                break;
        case 675:
        case 680:
        case 690:
                pdev->view_min.x = 128;
                pdev->view_min.y =  96;
                /* Anthill bug #38: PWC always reports max size, even without PWCX */
                if (pdev->decompressor != NULL) {
                        pdev->view_max.x = 640;
                        pdev->view_max.y = 480;
                        pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
                }
                else {
                        pdev->view_max.x = 352;
                        pdev->view_max.y = 288;
                        pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF;
                }
                pdev->vcinterface = 3;
                pdev->vendpoint = 4;
                pdev->frame_header_size = 0;
                pdev->frame_trailer_size = 0;
                break;
        case 720:
        case 730:
        case 740:
        case 750:
                pdev->view_min.x = 160;
                pdev->view_min.y = 120;
                /* Anthill bug #38: PWC always reports max size, even without PWCX */
                if (pdev->decompressor != NULL) {
                        pdev->view_max.x = 640;
                        pdev->view_max.y = 480;
                        pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
                }
                else {
                        /* Tell CIF, even though SIF really is the maximum, but some tools really need CIF */
                        pdev->view_max.x = 352;
                        pdev->view_max.y = 288;
                        pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF;
                }
                pdev->vcinterface = 3;
                pdev->vendpoint = 5;
                pdev->frame_header_size = TOUCAM_HEADER_SIZE;
                pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
                break;
        }
        pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
        pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
        /* length of image, in YUV format */
        pdev->len_per_image = (pdev->view_max.size * 3) / 2;
}