/*
 * Copyright © 2006 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include "randrstr.h"

#ifdef RANDR_10_INTERFACE
static RRModePtr
RROldModeAdd (RROutputPtr output, RRScreenSizePtr size, int refresh)
{
    ScreenPtr	pScreen = output->pScreen;
    rrScrPriv(pScreen);
    xRRModeInfo	modeInfo;
    char	name[100];
    RRModePtr	mode;
    int		i;
    RRModePtr   *modes;
    
    memset (&modeInfo, '\0', sizeof (modeInfo));
    snprintf (name, sizeof(name), "%dx%d", size->width, size->height);
    
    modeInfo.width = size->width;
    modeInfo.height = size->height;
    modeInfo.hTotal = size->width;
    modeInfo.vTotal = size->height;
    modeInfo.dotClock = ((CARD32) size->width * (CARD32) size->height *
			 (CARD32) refresh);
    modeInfo.nameLength = strlen (name);
    mode = RRModeGet (&modeInfo, name);
    if (!mode)
	return NULL;
    for (i = 0; i < output->numModes; i++)
	if (output->modes[i] == mode)
	{
	    RRModeDestroy (mode);
	    return mode;
	}
    
    if (output->numModes)
	modes = xrealloc (output->modes, 
			  (output->numModes + 1) * sizeof (RRModePtr));
    else
	modes = xalloc (sizeof (RRModePtr));
    if (!modes)
    {
	RRModeDestroy (mode);
	FreeResource (mode->mode.id, 0);
	return NULL;
    }
    modes[output->numModes++] = mode;
    output->modes = modes;
    output->changed = TRUE;
    pScrPriv->changed = TRUE;
    pScrPriv->configChanged = TRUE;
    return mode;
}

static void
RRScanOldConfig (ScreenPtr pScreen, Rotation rotations)
{
    rrScrPriv(pScreen);
    RROutputPtr	output;
    RRCrtcPtr	crtc;
    RRModePtr	mode, newMode = NULL;
    int		i;
    CARD16	minWidth = MAXSHORT, minHeight = MAXSHORT;
    CARD16	maxWidth = 0, maxHeight = 0;
    
    /*
     * First time through, create a crtc and output and hook
     * them together
     */
    if (pScrPriv->numOutputs == 0 &&
	pScrPriv->numCrtcs == 0)
    {
	crtc = RRCrtcCreate (pScreen, NULL);
	if (!crtc)
	    return;
	output = RROutputCreate (pScreen, "default", 7, NULL);
	if (!output)
	    return;
	RROutputSetCrtcs (output, &crtc, 1);
	RROutputSetConnection (output, RR_Connected);
#ifdef RENDER
	RROutputSetSubpixelOrder (output, PictureGetSubpixelOrder (pScreen));
#endif
    }

    output = pScrPriv->outputs[0];
    if (!output)
	return;
    crtc = pScrPriv->crtcs[0];
    if (!crtc)
	return;

    /* check rotations */
    if (rotations != crtc->rotations)
    {
        crtc->rotations = rotations;
	crtc->changed = TRUE;
	pScrPriv->changed = TRUE;
    }
	
    /* regenerate mode list */
    for (i = 0; i < pScrPriv->nSizes; i++)
    {
	RRScreenSizePtr	size = &pScrPriv->pSizes[i];
	int		r;

	if (size->nRates)
	{
	    for (r = 0; r < size->nRates; r++)
	    {
		mode = RROldModeAdd (output, size, size->pRates[r].rate);
		if (i == pScrPriv->size && 
		    size->pRates[r].rate == pScrPriv->rate)
		{
		    newMode = mode;
		}
	    }
	    xfree (size->pRates);
	}
	else
	{
	    mode = RROldModeAdd (output, size, 0);
	    if (i == pScrPriv->size)
		newMode = mode;
	}
    }
    if (pScrPriv->nSizes)
	xfree (pScrPriv->pSizes);
    pScrPriv->pSizes = NULL;
    pScrPriv->nSizes = 0;
	    
    /* find size bounds */
    for (i = 0; i < output->numModes + output->numUserModes; i++) 
    {
	RRModePtr   mode = (i < output->numModes ? 
			    output->modes[i] : 
			    output->userModes[i-output->numModes]);
        CARD16	    width = mode->mode.width;
        CARD16	    height = mode->mode.height;
	
	if (width < minWidth) minWidth = width;
	if (width > maxWidth) maxWidth = width;
	if (height < minHeight) minHeight = height;
	if (height > maxHeight) maxHeight = height;
    }

    RRScreenSetSizeRange (pScreen, minWidth, minHeight, maxWidth, maxHeight);

    /* notice current mode */
    if (newMode)
	RRCrtcNotify (crtc, newMode, 0, 0, pScrPriv->rotation,
		      NULL, 1, &output);
}
#endif

/*
 * Poll the driver for changed information
 */
Bool
RRGetInfo (ScreenPtr pScreen, Bool force_query)
{
    rrScrPriv (pScreen);
    Rotation	    rotations;
    int		    i;

    /* Return immediately if we don't need to re-query and we already have the
     * information.
     */
    if (!force_query) {
	if (pScrPriv->numCrtcs != 0 || pScrPriv->numOutputs != 0)
	    return TRUE;
    }

    for (i = 0; i < pScrPriv->numOutputs; i++)
	pScrPriv->outputs[i]->changed = FALSE;
    for (i = 0; i < pScrPriv->numCrtcs; i++)
	pScrPriv->crtcs[i]->changed = FALSE;
    
    rotations = 0;
    pScrPriv->changed = FALSE;
    pScrPriv->configChanged = FALSE;
    
    if (!(*pScrPriv->rrGetInfo) (pScreen, &rotations))
	return FALSE;

#if RANDR_10_INTERFACE
    if (pScrPriv->nSizes)
	RRScanOldConfig (pScreen, rotations);
#endif
    RRTellChanged (pScreen);
    return TRUE;
}

/*
 * Register the range of sizes for the screen
 */
void
RRScreenSetSizeRange (ScreenPtr	pScreen,
		      CARD16	minWidth,
		      CARD16	minHeight,
		      CARD16	maxWidth,
		      CARD16	maxHeight)
{
    rrScrPriv (pScreen);

    if (!pScrPriv)
	return;
    if (pScrPriv->minWidth == minWidth && pScrPriv->minHeight == minHeight &&
	pScrPriv->maxWidth == maxWidth && pScrPriv->maxHeight == maxHeight)
    {
	return;
    }
	
    pScrPriv->minWidth  = minWidth;
    pScrPriv->minHeight = minHeight;
    pScrPriv->maxWidth  = maxWidth;
    pScrPriv->maxHeight = maxHeight;
    pScrPriv->changed = TRUE;
    pScrPriv->configChanged = TRUE;
}

#ifdef RANDR_10_INTERFACE
static Bool
RRScreenSizeMatches (RRScreenSizePtr  a,
		   RRScreenSizePtr  b)
{
    if (a->width != b->width)
	return FALSE;
    if (a->height != b->height)
	return FALSE;
    if (a->mmWidth != b->mmWidth)
	return FALSE;
    if (a->mmHeight != b->mmHeight)
	return FALSE;
    return TRUE;
}

RRScreenSizePtr
RRRegisterSize (ScreenPtr	    pScreen,
		short		    width, 
		short		    height,
		short		    mmWidth,
		short		    mmHeight)
{
    rrScrPriv (pScreen);
    int		    i;
    RRScreenSize    tmp;
    RRScreenSizePtr pNew;

    if (!pScrPriv)
	return 0;
    
    tmp.id = 0;
    tmp.width = width;
    tmp.height= height;
    tmp.mmWidth = mmWidth;
    tmp.mmHeight = mmHeight;
    tmp.pRates = 0;
    tmp.nRates = 0;
    for (i = 0; i < pScrPriv->nSizes; i++)
	if (RRScreenSizeMatches (&tmp, &pScrPriv->pSizes[i]))
	    return &pScrPriv->pSizes[i];
    pNew = xrealloc (pScrPriv->pSizes,
		     (pScrPriv->nSizes + 1) * sizeof (RRScreenSize));
    if (!pNew)
	return 0;
    pNew[pScrPriv->nSizes++] = tmp;
    pScrPriv->pSizes = pNew;
    return &pNew[pScrPriv->nSizes-1];
}

Bool RRRegisterRate (ScreenPtr		pScreen,
		     RRScreenSizePtr	pSize,
		     int		rate)
{
    rrScrPriv(pScreen);
    int		    i;
    RRScreenRatePtr pNew, pRate;

    if (!pScrPriv)
	return FALSE;
    
    for (i = 0; i < pSize->nRates; i++)
	if (pSize->pRates[i].rate == rate)
	    return TRUE;

    pNew = xrealloc (pSize->pRates,
		     (pSize->nRates + 1) * sizeof (RRScreenRate));
    if (!pNew)
	return FALSE;
    pRate = &pNew[pSize->nRates++];
    pRate->rate = rate;
    pSize->pRates = pNew;
    return TRUE;
}

Rotation
RRGetRotation(ScreenPtr pScreen)
{
    RROutputPtr	output = RRFirstOutput (pScreen);

    if (!output)
	return RR_Rotate_0;

    return output->crtc->rotation;
}

void
RRSetCurrentConfig (ScreenPtr		pScreen,
		    Rotation		rotation,
		    int			rate,
		    RRScreenSizePtr	pSize)
{
    rrScrPriv (pScreen);

    if (!pScrPriv)
	return;
    pScrPriv->size = pSize - pScrPriv->pSizes;
    pScrPriv->rotation = rotation;
    pScrPriv->rate = rate;
}
#endif