xf86rotate.c

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    ScreenPtr	pScreen = pScrn->pScreen;

    damage_box.x1 = crtc->x;
    damage_box.x2 = crtc->x + xf86ModeWidth (&crtc->mode, crtc->rotation);
    damage_box.y1 = crtc->y;
    damage_box.y2 = crtc->y + xf86ModeHeight (&crtc->mode, crtc->rotation);
    REGION_INIT (pScreen, &damage_region, &damage_box, 1);
    DamageDamageRegion (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
			&damage_region);
    REGION_UNINIT (pScreen, &damage_region);
}

static void
xf86RotatePrepare (ScreenPtr pScreen)
{
    ScrnInfoPtr		pScrn = xf86Screens[pScreen->myNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int			c;

    for (c = 0; c < xf86_config->num_crtc; c++)
    {
	xf86CrtcPtr crtc = xf86_config->crtc[c];
	
	if (crtc->rotatedData && !crtc->rotatedPixmap)
	{
	    crtc->rotatedPixmap = crtc->funcs->shadow_create (crtc,
							     crtc->rotatedData,
							     crtc->mode.HDisplay,
							     crtc->mode.VDisplay);
	    if (!xf86_config->rotation_damage_registered)
	    {
		/* Hook damage to screen pixmap */
		DamageRegister (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
				xf86_config->rotation_damage);
		xf86_config->rotation_damage_registered = TRUE;
	    }
	    
	    xf86CrtcDamageShadow (crtc);
	}
    }
}

static Bool
xf86RotateRedisplay(ScreenPtr pScreen)
{
    ScrnInfoPtr		pScrn = xf86Screens[pScreen->myNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    DamagePtr		damage = xf86_config->rotation_damage;
    RegionPtr		region;

    if (!damage)
	return FALSE;
    xf86RotatePrepare (pScreen);
    region = DamageRegion(damage);
    if (REGION_NOTEMPTY(pScreen, region)) 
    {
	int			c;
	SourceValidateProcPtr	SourceValidate;

	/*
	 * SourceValidate is used by the software cursor code
	 * to pull the cursor off of the screen when reading
	 * bits from the frame buffer. Bypassing this function
	 * leaves the software cursor in place
	 */
	SourceValidate = pScreen->SourceValidate;
	pScreen->SourceValidate = NULL;

	for (c = 0; c < xf86_config->num_crtc; c++)
	{
	    xf86CrtcPtr	    crtc = xf86_config->crtc[c];

	    if (crtc->rotation != RR_Rotate_0 && crtc->enabled)
	    {
		RegionRec   crtc_damage;

		/* compute portion of damage that overlaps crtc */
		REGION_INIT(pScreen, &crtc_damage, &crtc->bounds, 1);
		REGION_INTERSECT (pScreen, &crtc_damage, &crtc_damage, region);
		
		/* update damaged region */
		if (REGION_NOTEMPTY(pScreen, &crtc_damage))
    		    xf86RotateCrtcRedisplay (crtc, &crtc_damage);
		
		REGION_UNINIT (pScreen, &crtc_damage);
	    }
	}
	pScreen->SourceValidate = SourceValidate;
	DamageEmpty(damage);
    }
    return TRUE;
}

static void
xf86RotateBlockHandler(int screenNum, pointer blockData,
		       pointer pTimeout, pointer pReadmask)
{
    ScreenPtr		pScreen = screenInfo.screens[screenNum];
    ScrnInfoPtr		pScrn = xf86Screens[screenNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);

    pScreen->BlockHandler = xf86_config->BlockHandler;
    (*pScreen->BlockHandler) (screenNum, blockData, pTimeout, pReadmask);
    if (xf86RotateRedisplay(pScreen))
    {
	/* Re-wrap if rotation is still happening */
	xf86_config->BlockHandler = pScreen->BlockHandler;
	pScreen->BlockHandler = xf86RotateBlockHandler;
    }
}

static void
xf86RotateDestroy (xf86CrtcPtr crtc)
{
    ScrnInfoPtr		pScrn = crtc->scrn;
    ScreenPtr		pScreen = pScrn->pScreen;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int			c;
    
    /* Free memory from rotation */
    if (crtc->rotatedPixmap || crtc->rotatedData)
    {
	crtc->funcs->shadow_destroy (crtc, crtc->rotatedPixmap, crtc->rotatedData);
	crtc->rotatedPixmap = NULL;
	crtc->rotatedData = NULL;
    }

    for (c = 0; c < xf86_config->num_crtc; c++)
	if (xf86_config->crtc[c]->rotatedPixmap ||
	    xf86_config->crtc[c]->rotatedData)
	    return;

    /*
     * Clean up damage structures when no crtcs are rotated
     */
    if (xf86_config->rotation_damage)
    {
	/* Free damage structure */
	if (xf86_config->rotation_damage_registered)
	{
	    DamageUnregister (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
			      xf86_config->rotation_damage);
	    xf86_config->rotation_damage_registered = FALSE;
	}
	DamageDestroy (xf86_config->rotation_damage);
	xf86_config->rotation_damage = NULL;
    }
}

_X_EXPORT void
xf86RotateCloseScreen (ScreenPtr screen)
{
    ScrnInfoPtr		scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int			c;

    for (c = 0; c < xf86_config->num_crtc; c++)
	xf86RotateDestroy (xf86_config->crtc[c]);
}

_X_EXPORT Bool
xf86CrtcRotate (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation)
{
    ScrnInfoPtr		pScrn = crtc->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    ScreenPtr		pScreen = pScrn->pScreen;
    PictTransform	crtc_to_fb, fb_to_crtc;
    
    PictureTransformIdentity (&crtc_to_fb);
    PictureTransformIdentity (&fb_to_crtc);
    PictureTransformIsInverse ("identity", &crtc_to_fb, &fb_to_crtc);
    if (rotation != RR_Rotate_0)
    {
	xFixed	rot_cos, rot_sin, rot_dx, rot_dy;
	xFixed	scale_x, scale_y, scale_dx, scale_dy;
	int	mode_w = crtc->mode.HDisplay;
	int	mode_h = crtc->mode.VDisplay;
	
	/* rotation */
	switch (rotation & 0xf) {
	default:
	case RR_Rotate_0:
	    rot_cos = F ( 1);	    rot_sin = F ( 0);
	    rot_dx  = F ( 0);	    rot_dy  = F ( 0);
	    break;
	case RR_Rotate_90:
	    rot_cos = F ( 0);	    rot_sin = F ( 1);
	    rot_dx =  F ( mode_h);  rot_dy  = F (0);
	    break;
	case RR_Rotate_180:
	    rot_cos = F (-1);	    rot_sin = F ( 0);
	    rot_dx  = F (mode_w);   rot_dy  = F ( mode_h);
	    break;
	case RR_Rotate_270:
	    rot_cos = F ( 0);	    rot_sin = F (-1);
	    rot_dx  = F ( 0);	    rot_dy  = F ( mode_w);
	    break;
	}
	
	PictureTransformRotate (&crtc_to_fb, &fb_to_crtc, rot_cos, rot_sin);
	PictureTransformIsInverse ("rotate", &crtc_to_fb, &fb_to_crtc);

	PictureTransformTranslate (&crtc_to_fb, &fb_to_crtc, rot_dx, rot_dy);
	PictureTransformIsInverse ("rotate translate", &crtc_to_fb, &fb_to_crtc);

	/* reflection */
	scale_x = F (1);
	scale_dx = 0;
	scale_y = F (1);
	scale_dy = 0;
	if (rotation & RR_Reflect_X)
	{
	    scale_x = F(-1);
	    if (rotation & (RR_Rotate_0|RR_Rotate_180))
		scale_dx = F(mode_w);
	    else
		scale_dx = F(mode_h);
	}
	if (rotation & RR_Reflect_Y)
	{
	    scale_y = F(-1);
	    if (rotation & (RR_Rotate_0|RR_Rotate_180))
		scale_dy = F(mode_h);
	    else
		scale_dy = F(mode_w);
	}
	
	PictureTransformScale (&crtc_to_fb, &fb_to_crtc, scale_x, scale_y);
	PictureTransformIsInverse ("scale", &crtc_to_fb, &fb_to_crtc);

	PictureTransformTranslate (&crtc_to_fb, &fb_to_crtc, scale_dx, scale_dy);
	PictureTransformIsInverse ("scale translate", &crtc_to_fb, &fb_to_crtc);

    }
    
    /*
     * If the untranslated transformation is the identity,
     * disable the shadow buffer
     */
    if (PictureTransformIsIdentity (&crtc_to_fb))
    {
	crtc->transform_in_use = FALSE;
	PictureTransformInitTranslate (&crtc->crtc_to_framebuffer, 
				       F (-crtc->x), F (-crtc->y));
	PictureTransformInitTranslate (&crtc->framebuffer_to_crtc,
				       F ( crtc->x), F ( crtc->y));
	xf86RotateDestroy (crtc);
    }
    else
    {
	PictureTransformTranslate (&crtc_to_fb, &fb_to_crtc, F(crtc->x), F(crtc->y));
	PictureTransformIsInverse ("offset", &crtc_to_fb, &fb_to_crtc);

	/* 
	 * these are the size of the shadow pixmap, which
	 * matches the mode, not the pre-rotated copy in the
	 * frame buffer
	 */
	int	    width = mode->HDisplay;
	int	    height = mode->VDisplay;
	void	    *shadowData = crtc->rotatedData;
	PixmapPtr   shadow = crtc->rotatedPixmap;
	int	    old_width = shadow ? shadow->drawable.width : 0;
	int	    old_height = shadow ? shadow->drawable.height : 0;
	
	/* Allocate memory for rotation */
	if (old_width != width || old_height != height)
	{
	    if (shadow || shadowData)
	    {
		crtc->funcs->shadow_destroy (crtc, shadow, shadowData);
		crtc->rotatedPixmap = NULL;
		crtc->rotatedData = NULL;
	    }
	    shadowData = crtc->funcs->shadow_allocate (crtc, width, height);
	    if (!shadowData)
		goto bail1;
	    crtc->rotatedData = shadowData;
	    /* shadow will be damaged in xf86RotatePrepare */
	}
	else
	{
	    /* mark shadowed area as damaged so it will be repainted */
	    xf86CrtcDamageShadow (crtc);
	}
	
	if (!xf86_config->rotation_damage)
	{
	    /* Create damage structure */
	    xf86_config->rotation_damage = DamageCreate (NULL, NULL,
						DamageReportNone,
						TRUE, pScreen, pScreen);
	    if (!xf86_config->rotation_damage)
		goto bail2;
	    
	    /* Wrap block handler */
	    xf86_config->BlockHandler = pScreen->BlockHandler;
	    pScreen->BlockHandler = xf86RotateBlockHandler;
	}
	if (0)
	{
    bail2:
	    if (shadow || shadowData)
	    {
		crtc->funcs->shadow_destroy (crtc, shadow, shadowData);
		crtc->rotatedPixmap = NULL;
		crtc->rotatedData = NULL;
	    }
    bail1:
	    if (old_width && old_height)
		crtc->rotatedPixmap = crtc->funcs->shadow_create (crtc,
								  NULL,
								  old_width,
								  old_height);
	    return FALSE;
	}
	crtc->transform_in_use = TRUE;
	crtc->crtc_to_framebuffer = crtc_to_fb;
	crtc->framebuffer_to_crtc = fb_to_crtc;
	crtc->bounds.x1 = 0;
	crtc->bounds.x2 = crtc->mode.HDisplay;
	crtc->bounds.y1 = 0;
	crtc->bounds.y2 = crtc->mode.VDisplay;
	PictureTransformBounds (&crtc->bounds, &crtc_to_fb);
    }
    
    /* All done */
    return TRUE;
}