/* Originally derived from the Intel example
 * Copyright (C) 2002 Keith Packard, member of The XFree86 Project, Inc.

 * Copyright (c) 2006 Advanced Micro Devices, Inc.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Neither the name of the Advanced Micro Devices, Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 */

#include "xf86.h"
#include "os.h"
#include "mibank.h"
#include "globals.h"
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86DDC.h"
#include "mipointer.h"
#include "windowstr.h"
#include <X11/extensions/randr.h>
#include <randrstr.h>

#include "amd.h"

static int LXRandRIndex;
static int LXRandRGeneration;

typedef struct _LXRandRInfo
{
    int virtualX;
    int virtualY;
    int mmWidth;
    int mmHeight;
    int maxX;
    int maxY;
    Rotation rotation;		       /* current mode */
    Rotation supported_rotations;      /* driver supported */
} XF86RandRInfoRec, *XF86RandRInfoPtr;

#define XF86RANDRINFO(p) ((XF86RandRInfoPtr) (p)->devPrivates[LXRandRIndex].ptr)

static int
LXRandRModeRefresh(DisplayModePtr mode)
{
    if (mode->VRefresh)
	return (int)(mode->VRefresh + 0.5);
    else
	return (int)(mode->Clock * 1000.0 / mode->HTotal / mode->VTotal +
	    0.5);
}

static Bool
LXRandRGetInfo(ScreenPtr pScreen, Rotation * rotations)
{
    RRScreenSizePtr pSize;
    ScrnInfoPtr pScrni = XF86SCRNINFO(pScreen);
    XF86RandRInfoPtr pRandr = XF86RANDRINFO(pScreen);
    DisplayModePtr mode;
    int refresh0 = 60;
    int maxX = 0, maxY = 0;

    *rotations = pRandr->supported_rotations;

    if (pRandr->virtualX == -1 || pRandr->virtualY == -1) {
	pRandr->virtualX = pScrni->virtualX;
	pRandr->virtualY = pScrni->virtualY;
    }

    for (mode = pScrni->modes;; mode = mode->next) {
	int refresh = LXRandRModeRefresh(mode);

	if (pRandr->maxX == 0 || pRandr->maxY == 0) {
	    if (maxX < mode->HDisplay)
		maxX = mode->HDisplay;
	    if (maxY < mode->VDisplay)
		maxY = mode->VDisplay;
	}

	if (mode == pScrni->modes)
	    refresh0 = refresh;

	pSize = RRRegisterSize(pScreen,
	    mode->HDisplay, mode->VDisplay,
	    pRandr->mmWidth, pRandr->mmHeight);
	if (!pSize)
	    return FALSE;

	RRRegisterRate(pScreen, pSize, refresh);

	if (mode == pScrni->currentMode &&
	    mode->HDisplay == pScrni->virtualX
	    && mode->VDisplay == pScrni->virtualY)
	    RRSetCurrentConfig(pScreen, pRandr->rotation, refresh, pSize);
	if (mode->next == pScrni->modes)
	    break;
    }

    if (pRandr->maxX == 0 || pRandr->maxY == 0) {
	pRandr->maxX = maxX;
	pRandr->maxY = maxY;
    }

    if (pScrni->currentMode->HDisplay != pScrni->virtualX ||
	pScrni->currentMode->VDisplay != pScrni->virtualY) {

	mode = pScrni->modes;
	pSize = RRRegisterSize(pScreen,
	    pRandr->virtualX, pRandr->virtualY,
	    pRandr->mmWidth, pRandr->mmHeight);
	if (!pSize)
	    return FALSE;

	RRRegisterRate(pScreen, pSize, refresh0);
	if (pScrni->virtualX == pRandr->virtualX &&
	    pScrni->virtualY == pRandr->virtualY) {
	    RRSetCurrentConfig(pScreen, pRandr->rotation, refresh0, pSize);
	}
    }

    return TRUE;
}

static Bool
LXRandRSetMode(ScreenPtr pScreen,
    DisplayModePtr mode, Bool useVirtual, int mmWidth, int mmHeight)
{
    ScrnInfoPtr pScrni = XF86SCRNINFO(pScreen);
    XF86RandRInfoPtr pRandr = XF86RANDRINFO(pScreen);

    int oldWidth = pScreen->width;
    int oldHeight = pScreen->height;
    int oldmmWidth = pScreen->mmWidth;
    int oldmmHeight = pScreen->mmHeight;
    WindowPtr pRoot = WindowTable[pScreen->myNum];
    DisplayModePtr currentMode = NULL;
    Bool ret = TRUE;
    PixmapPtr pspix = NULL;

    if (pRoot)
	(*pScrni->EnableDisableFBAccess) (pScreen->myNum, FALSE);

    if (useVirtual) {
	pScrni->virtualX = pRandr->virtualX;
	pScrni->virtualY = pRandr->virtualY;
    } else {
	pScrni->virtualX = mode->HDisplay;
	pScrni->virtualY = mode->VDisplay;
    }

    if (pRandr->rotation & (RR_Rotate_90 | RR_Rotate_270)) {
	pScreen->width = pScrni->virtualY;
	pScreen->height = pScrni->virtualX;
	pScreen->mmWidth = mmHeight;
	pScreen->mmHeight = mmWidth;
    } else {
	pScreen->width = pScrni->virtualX;
	pScreen->height = pScrni->virtualY;
	pScreen->mmWidth = mmWidth;
	pScreen->mmHeight = mmHeight;
    }

    if (pScrni->currentMode == mode) {
	currentMode = pScrni->currentMode;
	pScrni->currentMode = NULL;
    }

    if (!xf86SwitchMode(pScreen, mode)) {
	ret = FALSE;
	pScrni->virtualX = pScreen->width = oldWidth;
	pScrni->virtualY = pScreen->height = oldHeight;
	pScreen->mmWidth = oldmmWidth;
	pScreen->mmHeight = oldmmHeight;
	pScrni->currentMode = currentMode;
    }

    /*
     * Get the new Screen pixmap ptr as SwitchMode might have called
     * ModifyPixmapHeader and xf86EnableDisableFBAccess will put it back...
     * Unfortunately.
     
     */

    pspix = (*pScreen->GetScreenPixmap) (pScreen);
    if (pspix->devPrivate.ptr)
	pScrni->pixmapPrivate = pspix->devPrivate;

    xf86ReconfigureLayout();

    xf86SetViewport(pScreen, pScreen->width, pScreen->height);
    xf86SetViewport(pScreen, 0, 0);

    if (pRoot)
	(*pScrni->EnableDisableFBAccess) (pScreen->myNum, TRUE);

    return ret;
}

Bool
LXRandRSetConfig(ScreenPtr pScreen, Rotation rotation,
    int rate, RRScreenSizePtr pSize)
{
    ScrnInfoPtr pScrni = XF86SCRNINFO(pScreen);
    XF86RandRInfoPtr pRandr = XF86RANDRINFO(pScreen);

    DisplayModePtr mode;
    int px, py;
    Bool useVirtual = FALSE;
    int maxX = 0, maxY = 0;
    Rotation oldRotation = pRandr->rotation;

    pRandr->rotation = rotation;

    if (pRandr->virtualX == -1 || pRandr->virtualY == -1) {
	pRandr->virtualX = pScrni->virtualX;
	pRandr->virtualY = pScrni->virtualY;
    }

    miPointerPosition(&px, &py);

    for (mode = pScrni->modes;; mode = mode->next) {
	if (pRandr->maxX == 0 || pRandr->maxY == 0) {
	    if (maxX < mode->HDisplay)
		maxX = mode->HDisplay;
	    if (maxY < mode->VDisplay)
		maxY = mode->VDisplay;
	}
	if (mode->HDisplay == pSize->width &&
	    mode->VDisplay == pSize->height &&
	    (rate == 0 || LXRandRModeRefresh(mode) == rate))
	    break;
	if (mode->next == pScrni->modes) {
	    if (pSize->width == pRandr->virtualX &&
		pSize->height == pRandr->virtualY) {
		mode = pScrni->modes;
		useVirtual = TRUE;
		break;
	    }
	    if (pRandr->maxX == 0 || pRandr->maxY == 0) {
		pRandr->maxX = maxX;
		pRandr->maxY = maxY;
	    }
	    return FALSE;
	}
    }

    if (pRandr->maxX == 0 || pRandr->maxY == 0) {
	pRandr->maxX = maxX;
	pRandr->maxY = maxY;
    }

    if (!LXRandRSetMode(pScreen, mode, useVirtual, pSize->mmWidth,
	    pSize->mmHeight)) {
	pRandr->rotation = oldRotation;
	return FALSE;
    }

    if (pScreen == miPointerCurrentScreen()) {
	px = (px >= pScreen->width ? (pScreen->width - 1) : px);
	py = (py >= pScreen->height ? (pScreen->height - 1) : py);

	xf86SetViewport(pScreen, px, py);

	(*pScreen->SetCursorPosition) (pScreen, px, py, FALSE);
    }

    return TRUE;
}

Rotation
LXGetRotation(ScreenPtr pScreen)
{
    XF86RandRInfoPtr pRandr = XF86RANDRINFO(pScreen);

    return pRandr ? pRandr->rotation : RR_Rotate_0;
}

Bool
LXRandRInit(ScreenPtr pScreen, int rotation)
{
    XF86RandRInfoPtr pRandr;
    rrScrPrivPtr rp;

    if (LXRandRGeneration != serverGeneration) {
	LXRandRIndex = AllocateScreenPrivateIndex();
	LXRandRGeneration = serverGeneration;
    }

    pRandr = xcalloc(sizeof(XF86RandRInfoRec), 1);
    if (pRandr == NULL)
	return FALSE;

    if (!RRScreenInit(pScreen)) {
	xfree(pRandr);
	return FALSE;
    }

    rp = rrGetScrPriv(pScreen);
    rp->rrGetInfo = LXRandRGetInfo;
    rp->rrSetConfig = LXRandRSetConfig;

    pRandr->virtualX = -1;
    pRandr->virtualY = -1;

    pRandr->mmWidth = pScreen->mmWidth;
    pRandr->mmHeight = pScreen->mmHeight;

    pRandr->rotation = RR_Rotate_0;
    pRandr->supported_rotations = rotation;
    pRandr->maxX = pRandr->maxY = 0;

    pScreen->devPrivates[LXRandRIndex].ptr = pRandr;
    return TRUE;
}