/*
 * Copyright © 2001 Keith Packard
 *
 * Partly based on code that is Copyright © The XFree86 Project Inc.
 *
 * 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 Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD 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.
 */

/** @file
 * This file covers the initialization and teardown of UXA, and has various
 * functions not responsible for performing rendering, pixmap migration, or
 * memory management.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stdlib.h>

#include "uxa-priv.h"
#include <X11/fonts/fontstruct.h>
#include "dixfontstr.h"
#include "uxa.h"

#if HAS_DEVPRIVATEKEYREC
DevPrivateKeyRec uxa_screen_index;
#else
int uxa_screen_index;
#endif

/**
 * uxa_get_drawable_pixmap() returns a backing pixmap for a given drawable.
 *
 * @param pDrawable the drawable being requested.
 *
 * This function returns the backing pixmap for a drawable, whether it is a
 * redirected window, unredirected window, or already a pixmap.  Note that
 * coordinate translation is needed when drawing to the backing pixmap of a
 * redirected window, and the translation coordinates are provided by calling
 * uxa_get_drawable_pixmap() on the drawable.
 */
PixmapPtr uxa_get_drawable_pixmap(DrawablePtr pDrawable)
{
	if (pDrawable->type == DRAWABLE_WINDOW)
		return pDrawable->pScreen->
		    GetWindowPixmap((WindowPtr) pDrawable);
	else
		return (PixmapPtr) pDrawable;
}

/**
 * Sets the offsets to add to coordinates to make them address the same bits in
 * the backing drawable. These coordinates are nonzero only for redirected
 * windows.
 */
void
uxa_get_drawable_deltas(DrawablePtr pDrawable, PixmapPtr pPixmap,
			int *xp, int *yp)
{
#ifdef COMPOSITE
	if (pDrawable->type == DRAWABLE_WINDOW) {
		*xp = -pPixmap->screen_x;
		*yp = -pPixmap->screen_y;
		return;
	}
#endif

	*xp = 0;
	*yp = 0;
}

/**
 * uxa_pixmap_is_offscreen() is used to determine if a pixmap is in offscreen
 * memory, meaning that acceleration could probably be done to it, and that it
 * will need to be wrapped by PrepareAccess()/FinishAccess() when accessing it
 * with the CPU.
 *
 * Note that except for UploadToScreen()/DownloadFromScreen() (which explicitly
 * deal with moving pixmaps in and out of system memory), UXA will give drivers
 * pixmaps as arguments for which uxa_pixmap_is_offscreen() is TRUE.
 *
 * @return TRUE if the given drawable is in framebuffer memory.
 */
Bool uxa_pixmap_is_offscreen(PixmapPtr p)
{
	ScreenPtr pScreen = p->drawable.pScreen;
	uxa_screen_t *uxa_screen = uxa_get_screen(pScreen);

	if (uxa_screen->info->pixmap_is_offscreen)
		return uxa_screen->info->pixmap_is_offscreen(p);

	return FALSE;
}

/**
 * uxa_drawable_is_offscreen() is a convenience wrapper for
 * uxa_pixmap_is_offscreen().
 */
Bool uxa_drawable_is_offscreen(DrawablePtr pDrawable)
{
	return uxa_pixmap_is_offscreen(uxa_get_drawable_pixmap(pDrawable));
}

/**
  * Returns the pixmap which backs a drawable, and the offsets to add to
  * coordinates to make them address the same bits in the backing drawable.
  */
PixmapPtr uxa_get_offscreen_pixmap(DrawablePtr drawable, int *xp, int *yp)
{
	PixmapPtr pixmap = uxa_get_drawable_pixmap(drawable);

	uxa_get_drawable_deltas(drawable, pixmap, xp, yp);

	if (uxa_pixmap_is_offscreen(pixmap))
		return pixmap;
	else
		return NULL;
}

/**
 * uxa_prepare_access() is UXA's wrapper for the driver's PrepareAccess() handler.
 *
 * It deals with waiting for synchronization with the card, determining if
 * PrepareAccess() is necessary, and working around PrepareAccess() failure.
 */
Bool uxa_prepare_access(DrawablePtr pDrawable, uxa_access_t access)
{
	ScreenPtr pScreen = pDrawable->pScreen;
	uxa_screen_t *uxa_screen = uxa_get_screen(pScreen);
	PixmapPtr pPixmap = uxa_get_drawable_pixmap(pDrawable);
	Bool offscreen = uxa_pixmap_is_offscreen(pPixmap);

	if (!offscreen)
		return TRUE;

	if (uxa_screen->info->prepare_access)
		return (*uxa_screen->info->prepare_access) (pPixmap, access);
	return TRUE;
}

/**
 * uxa_finish_access() is UXA's wrapper for the driver's finish_access() handler.
 *
 * It deals with calling the driver's finish_access() only if necessary.
 */
void uxa_finish_access(DrawablePtr pDrawable)
{
	ScreenPtr pScreen = pDrawable->pScreen;
	uxa_screen_t *uxa_screen = uxa_get_screen(pScreen);
	PixmapPtr pPixmap = uxa_get_drawable_pixmap(pDrawable);

	if (uxa_screen->info->finish_access == NULL)
		return;

	if (!uxa_pixmap_is_offscreen(pPixmap))
		return;

	(*uxa_screen->info->finish_access) (pPixmap);
}

/**
 * uxa_validate_gc() sets the ops to UXA's implementations, which may be
 * accelerated or may sync the card and fall back to fb.
 */
static void
uxa_validate_gc(GCPtr pGC, unsigned long changes, DrawablePtr pDrawable)
{
	/* fbValidateGC will do direct access to pixmaps if the tiling has
	 * changed.
	 * Preempt fbValidateGC by doing its work and masking the change out, so
	 * that we can do the Prepare/finish_access.
	 */
#ifdef FB_24_32BIT
	if ((changes & GCTile) && fbGetRotatedPixmap(pGC)) {
		(*pGC->pScreen->DestroyPixmap) (fbGetRotatedPixmap(pGC));
		fbGetRotatedPixmap(pGC) = 0;
	}

	if (pGC->fillStyle == FillTiled) {
		PixmapPtr pOldTile, pNewTile;

		pOldTile = pGC->tile.pixmap;
		if (pOldTile->drawable.bitsPerPixel != pDrawable->bitsPerPixel) {
			pNewTile = fbGetRotatedPixmap(pGC);
			if (!pNewTile ||
			    pNewTile->drawable.bitsPerPixel !=
			    pDrawable->bitsPerPixel) {
				if (pNewTile)
					(*pGC->pScreen->
					 DestroyPixmap) (pNewTile);
				/* fb24_32ReformatTile will do direct access
				 * of a newly-allocated pixmap.  This isn't a
				 * problem yet, since we don't put pixmaps in
				 * FB until at least one accelerated UXA op.
				 */
				if (uxa_prepare_access
				    (&pOldTile->drawable, UXA_ACCESS_RO)) {
					pNewTile =
					    fb24_32ReformatTile(pOldTile,
								pDrawable->
								bitsPerPixel);
					uxa_finish_access(&pOldTile->drawable);
				}
			}
			if (pNewTile) {
				fbGetRotatedPixmap(pGC) = pOldTile;
				pGC->tile.pixmap = pNewTile;
				changes |= GCTile;
			}
		}
	}
#endif
	if (changes & GCTile) {
		if (!pGC->tileIsPixel
		    && FbEvenTile(pGC->tile.pixmap->drawable.width *
				  pDrawable->bitsPerPixel)) {
			if (uxa_prepare_access
			    (&pGC->tile.pixmap->drawable, UXA_ACCESS_RW)) {
				fbPadPixmap(pGC->tile.pixmap);
				uxa_finish_access(&pGC->tile.pixmap->drawable);
			}
		}
		/* Mask out the GCTile change notification, now that we've
		 * done FB's job for it.
		 */
		changes &= ~GCTile;
	}

	if (changes & GCStipple && pGC->stipple) {
		/* We can't inline stipple handling like we do for GCTile
		 * because it sets fbgc privates.
		 */
		if (uxa_prepare_access(&pGC->stipple->drawable, UXA_ACCESS_RW)) {
			fbValidateGC(pGC, changes, pDrawable);
			uxa_finish_access(&pGC->stipple->drawable);
		}
	} else {
		fbValidateGC(pGC, changes, pDrawable);
	}

	pGC->ops = (GCOps *) & uxa_ops;
}

static GCFuncs uxaGCFuncs = {
	uxa_validate_gc,
	miChangeGC,
	miCopyGC,
	miDestroyGC,
	miChangeClip,
	miDestroyClip,
	miCopyClip
};

/**
 * uxa_create_gc makes a new GC and hooks up its funcs handler, so that
 * uxa_validate_gc() will get called.
 */
static int uxa_create_gc(GCPtr pGC)
{
	if (!fbCreateGC(pGC))
		return FALSE;

	pGC->funcs = &uxaGCFuncs;

	return TRUE;
}

Bool uxa_prepare_access_window(WindowPtr pWin)
{
	if (pWin->backgroundState == BackgroundPixmap) {
		if (!uxa_prepare_access
		    (&pWin->background.pixmap->drawable, UXA_ACCESS_RO))
			return FALSE;
	}

	if (pWin->borderIsPixel == FALSE) {
		if (!uxa_prepare_access
		    (&pWin->border.pixmap->drawable, UXA_ACCESS_RO)) {
			if (pWin->backgroundState == BackgroundPixmap)
				uxa_finish_access(&pWin->background.pixmap->
						  drawable);
			return FALSE;
		}
	}
	return TRUE;
}

void uxa_finish_access_window(WindowPtr pWin)
{
	if (pWin->backgroundState == BackgroundPixmap)
		uxa_finish_access(&pWin->background.pixmap->drawable);

	if (pWin->borderIsPixel == FALSE)
		uxa_finish_access(&pWin->border.pixmap->drawable);
}

static Bool uxa_change_window_attributes(WindowPtr pWin, unsigned long mask)
{
	Bool ret;

	if (!uxa_prepare_access_window(pWin))
		return FALSE;
	ret = fbChangeWindowAttributes(pWin, mask);
	uxa_finish_access_window(pWin);
	return ret;
}

static RegionPtr uxa_bitmap_to_region(PixmapPtr pPix)
{
	RegionPtr ret;
	if (!uxa_prepare_access(&pPix->drawable, UXA_ACCESS_RO))
		return NULL;
	ret = fbPixmapToRegion(pPix);
	uxa_finish_access(&pPix->drawable);
	return ret;
}

static void uxa_xorg_enable_disable_fb_access(int index, Bool enable)
{
	ScreenPtr screen = screenInfo.screens[index];
	uxa_screen_t *uxa_screen = uxa_get_screen(screen);

	if (!enable && uxa_screen->disableFbCount++ == 0)
		uxa_screen->swappedOut = TRUE;

	if (enable && --uxa_screen->disableFbCount == 0)
		uxa_screen->swappedOut = FALSE;

	if (uxa_screen->SavedEnableDisableFBAccess)
		uxa_screen->SavedEnableDisableFBAccess(index, enable);
}

void uxa_set_fallback_debug(ScreenPtr screen, Bool enable)
{
	uxa_screen_t *uxa_screen = uxa_get_screen(screen);

	uxa_screen->fallback_debug = enable;
}

void uxa_set_force_fallback(ScreenPtr screen, Bool value)
{
	uxa_screen_t *uxa_screen = uxa_get_screen(screen);

	uxa_screen->force_fallback = value;
}

/**
 * uxa_close_screen() unwraps its wrapped screen functions and tears down UXA's
 * screen private, before calling down to the next CloseSccreen.
 */
static Bool uxa_close_screen(int i, ScreenPtr pScreen)
{
	uxa_screen_t *uxa_screen = uxa_get_screen(pScreen);
	ScrnInfoPtr scrn = xf86Screens[pScreen->myNum];
#ifdef RENDER
	PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
#endif
	int n;

	if (uxa_screen->solid_clear)
		FreePicture(uxa_screen->solid_clear, 0);
	if (uxa_screen->solid_black)
		FreePicture(uxa_screen->solid_black, 0);
	if (uxa_screen->solid_white)
		FreePicture(uxa_screen->solid_white, 0);
	for (n = 0; n < uxa_screen->solid_cache_size; n++)
		FreePicture(uxa_screen->solid_cache[n].picture, 0);

	uxa_glyphs_fini(pScreen);

	/* Destroy the pixmap created by miScreenInit() *before* chaining up as
	 * we finalize ourselves here and so this is the last chance we have of
	 * releasing our resources associated with the Pixmap. So do it first.
	 */
	(void) (*pScreen->DestroyPixmap) (pScreen->devPrivate);
	pScreen->devPrivate = NULL;

	pScreen->CreateGC = uxa_screen->SavedCreateGC;
	pScreen->CloseScreen = uxa_screen->SavedCloseScreen;
	pScreen->GetImage = uxa_screen->SavedGetImage;
	pScreen->GetSpans = uxa_screen->SavedGetSpans;
	pScreen->CreatePixmap = uxa_screen->SavedCreatePixmap;
	pScreen->DestroyPixmap = uxa_screen->SavedDestroyPixmap;
	pScreen->CopyWindow = uxa_screen->SavedCopyWindow;
	pScreen->ChangeWindowAttributes =
	    uxa_screen->SavedChangeWindowAttributes;
	pScreen->BitmapToRegion = uxa_screen->SavedBitmapToRegion;
	scrn->EnableDisableFBAccess = uxa_screen->SavedEnableDisableFBAccess;
#ifdef RENDER
	if (ps) {
		ps->Composite = uxa_screen->SavedComposite;
		ps->CompositeRects = uxa_screen->SavedCompositeRects;
		ps->Glyphs = uxa_screen->SavedGlyphs;
		ps->Trapezoids = uxa_screen->SavedTrapezoids;
		ps->AddTraps = uxa_screen->SavedAddTraps;
		ps->Triangles = uxa_screen->SavedTriangles;

		ps->UnrealizeGlyph = uxa_screen->SavedUnrealizeGlyph;
	}
#endif

	free(uxa_screen);

	return (*pScreen->CloseScreen) (i, pScreen);
}

/**
 * This function allocates a driver structure for UXA drivers to fill in.  By
 * having UXA allocate the structure, the driver structure can be extended
 * without breaking ABI between UXA and the drivers.  The driver's
 * responsibility is to check beforehand that the UXA module has a matching
 * major number and sufficient minor.  Drivers are responsible for freeing the
 * driver structure using free().
 *
 * @return a newly allocated, zero-filled driver structure
 */
uxa_driver_t *uxa_driver_alloc(void)
{
	return calloc(1, sizeof(uxa_driver_t));
}

/**
 * @param pScreen screen being initialized
 * @param pScreenInfo UXA driver record
 *
 * uxa_driver_init sets up UXA given a driver record filled in by the driver.
 * pScreenInfo should have been allocated by uxa_driver_alloc().  See the
 * comments in _UxaDriver for what must be filled in and what is optional.
 *
 * @return TRUE if UXA was successfully initialized.
 */
Bool uxa_driver_init(ScreenPtr screen, uxa_driver_t * uxa_driver)
{
	uxa_screen_t *uxa_screen;
	ScrnInfoPtr scrn = xf86Screens[screen->myNum];

	if (!uxa_driver)
		return FALSE;

	if (uxa_driver->uxa_major != UXA_VERSION_MAJOR ||
	    uxa_driver->uxa_minor > UXA_VERSION_MINOR) {
		LogMessage(X_ERROR,
			   "UXA(%d): driver's UXA version requirements "
			   "(%d.%d) are incompatible with UXA version (%d.%d)\n",
			   screen->myNum, uxa_driver->uxa_major,
			   uxa_driver->uxa_minor, UXA_VERSION_MAJOR,
			   UXA_VERSION_MINOR);
		return FALSE;
	}

	if (!uxa_driver->prepare_solid) {
		LogMessage(X_ERROR,
			   "UXA(%d): uxa_driver_t::prepare_solid must be "
			   "non-NULL\n", screen->myNum);
		return FALSE;
	}

	if (!uxa_driver->prepare_copy) {
		LogMessage(X_ERROR,
			   "UXA(%d): uxa_driver_t::prepare_copy must be "
			   "non-NULL\n", screen->myNum);
		return FALSE;
	}
#if HAS_DIXREGISTERPRIVATEKEY
	if (!dixRegisterPrivateKey(&uxa_screen_index, PRIVATE_SCREEN, 0))
	    return FALSE;
#endif
	uxa_screen = calloc(sizeof(uxa_screen_t), 1);

	if (!uxa_screen) {
		LogMessage(X_WARNING,
			   "UXA(%d): Failed to allocate screen private\n",
			   screen->myNum);
		return FALSE;
	}

	uxa_screen->info = uxa_driver;

	dixSetPrivate(&screen->devPrivates, &uxa_screen_index, uxa_screen);

	uxa_screen->force_fallback = FALSE;

	uxa_screen->solid_cache_size = 0;
	uxa_screen->solid_clear = 0;
	uxa_screen->solid_black = 0;
	uxa_screen->solid_white = 0;

//    exaDDXDriverInit(screen);

	/*
	 * Replace various fb screen functions
	 */
	uxa_screen->SavedCloseScreen = screen->CloseScreen;
	screen->CloseScreen = uxa_close_screen;

	uxa_screen->SavedCreateGC = screen->CreateGC;
	screen->CreateGC = uxa_create_gc;

	uxa_screen->SavedGetImage = screen->GetImage;
	screen->GetImage = uxa_get_image;

	uxa_screen->SavedGetSpans = screen->GetSpans;
	screen->GetSpans = uxa_check_get_spans;

	uxa_screen->SavedCopyWindow = screen->CopyWindow;
	screen->CopyWindow = uxa_copy_window;

	uxa_screen->SavedChangeWindowAttributes =
	    screen->ChangeWindowAttributes;
	screen->ChangeWindowAttributes = uxa_change_window_attributes;

	uxa_screen->SavedBitmapToRegion = screen->BitmapToRegion;
	screen->BitmapToRegion = uxa_bitmap_to_region;

	uxa_screen->SavedEnableDisableFBAccess = scrn->EnableDisableFBAccess;
	scrn->EnableDisableFBAccess = uxa_xorg_enable_disable_fb_access;

#ifdef RENDER
	{
		PictureScreenPtr ps = GetPictureScreenIfSet(screen);
		if (ps) {
			uxa_screen->SavedComposite = ps->Composite;
			ps->Composite = uxa_composite;

			uxa_screen->SavedCompositeRects = ps->CompositeRects;
			ps->CompositeRects = uxa_solid_rects;

			uxa_screen->SavedGlyphs = ps->Glyphs;
			ps->Glyphs = uxa_glyphs;

			uxa_screen->SavedUnrealizeGlyph = ps->UnrealizeGlyph;
			ps->UnrealizeGlyph = uxa_glyph_unrealize;

			uxa_screen->SavedTriangles = ps->Triangles;
			ps->Triangles = uxa_triangles;

			uxa_screen->SavedTrapezoids = ps->Trapezoids;
			ps->Trapezoids = uxa_trapezoids;

			uxa_screen->SavedAddTraps = ps->AddTraps;
			ps->AddTraps = uxa_check_add_traps;
		}
	}
#endif

	LogMessage(X_INFO,
		   "UXA(%d): Driver registered support for the following"
		   " operations:\n", screen->myNum);
	assert(uxa_driver->prepare_solid != NULL);
	LogMessage(X_INFO, "        solid\n");
	assert(uxa_driver->prepare_copy != NULL);
	LogMessage(X_INFO, "        copy\n");
	if (uxa_driver->prepare_composite != NULL) {
		LogMessage(X_INFO, "        composite (RENDER acceleration)\n");
	}
	if (uxa_driver->put_image != NULL) {
		LogMessage(X_INFO, "        put_image\n");
	}
	if (uxa_driver->get_image != NULL) {
		LogMessage(X_INFO, "        get_image\n");
	}

	return TRUE;
}

Bool uxa_resources_init(ScreenPtr screen)
{
	if (!uxa_glyphs_init(screen))
		return FALSE;

	return TRUE;
}

/**
 * uxa_driver_fini tears down UXA on a given screen.
 *
 * @param pScreen screen being torn down.
 */
void uxa_driver_fini(ScreenPtr pScreen)
{
	/*right now does nothing */
}