xf86Crtc.c 95.7 KB
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/*
 * Copyright © 2006 Keith Packard
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 * Copyright © 2008 Red Hat, Inc.
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 *
 * 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.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
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#else
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
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#endif

#include <stddef.h>
#include <string.h>
#include <stdio.h>

#include "xf86.h"
#include "xf86DDC.h"
#include "xf86Crtc.h"
#include "xf86Modes.h"
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#include "xf86Priv.h"
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#include "xf86RandR12.h"
#include "X11/extensions/render.h"
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#include "X11/extensions/dpmsconst.h"
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#include "X11/Xatom.h"
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#include "picturestr.h"
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#ifdef XV
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#include "xf86xv.h"
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#endif
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#define NO_OUTPUT_DEFAULT_WIDTH 1024
#define NO_OUTPUT_DEFAULT_HEIGHT 768
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/*
 * Initialize xf86CrtcConfig structure
 */

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int xf86CrtcConfigPrivateIndex = -1;
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void
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xf86CrtcConfigInit(ScrnInfoPtr scrn, const xf86CrtcConfigFuncsRec * funcs)
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{
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    xf86CrtcConfigPtr config;

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    if (xf86CrtcConfigPrivateIndex == -1)
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        xf86CrtcConfigPrivateIndex = xf86AllocateScrnInfoPrivateIndex();
    config = xnfcalloc(1, sizeof(xf86CrtcConfigRec));
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    config->funcs = funcs;

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    scrn->privates[xf86CrtcConfigPrivateIndex].ptr = config;
}
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void
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xf86CrtcSetSizeRange(ScrnInfoPtr scrn,
                     int minWidth, int minHeight, int maxWidth, int maxHeight)
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{
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    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
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    config->minWidth = minWidth;
    config->minHeight = minHeight;
    config->maxWidth = maxWidth;
    config->maxHeight = maxHeight;
}

/*
 * Crtc functions
 */
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xf86CrtcPtr
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xf86CrtcCreate(ScrnInfoPtr scrn, const xf86CrtcFuncsRec * funcs)
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{
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    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    xf86CrtcPtr crtc, *crtcs;
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    crtc = calloc(sizeof(xf86CrtcRec), 1);
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    if (!crtc)
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        return NULL;
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    crtc->version = XF86_CRTC_VERSION;
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    crtc->scrn = scrn;
    crtc->funcs = funcs;
#ifdef RANDR_12_INTERFACE
    crtc->randr_crtc = NULL;
#endif
    crtc->rotation = RR_Rotate_0;
    crtc->desiredRotation = RR_Rotate_0;
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    pixman_transform_init_identity(&crtc->crtc_to_framebuffer);
    pixman_f_transform_init_identity(&crtc->f_crtc_to_framebuffer);
    pixman_f_transform_init_identity(&crtc->f_framebuffer_to_crtc);
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    crtc->filter = NULL;
    crtc->params = NULL;
    crtc->nparams = 0;
    crtc->filter_width = 0;
    crtc->filter_height = 0;
    crtc->transform_in_use = FALSE;
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    crtc->transformPresent = FALSE;
    crtc->desiredTransformPresent = FALSE;
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    memset(&crtc->bounds, '\0', sizeof(crtc->bounds));
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    /* Preallocate gamma at a sensible size. */
    crtc->gamma_size = 256;
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    crtc->gamma_red = malloc(3 * crtc->gamma_size * sizeof(CARD16));
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    if (!crtc->gamma_red) {
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        free(crtc);
        return NULL;
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    }
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    crtc->gamma_green = crtc->gamma_red + crtc->gamma_size;
    crtc->gamma_blue = crtc->gamma_green + crtc->gamma_size;

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    if (xf86_config->crtc)
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        crtcs = realloc(xf86_config->crtc,
                        (xf86_config->num_crtc + 1) * sizeof(xf86CrtcPtr));
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    else
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        crtcs = malloc((xf86_config->num_crtc + 1) * sizeof(xf86CrtcPtr));
    if (!crtcs) {
        free(crtc->gamma_red);
        free(crtc);
        return NULL;
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    }
    xf86_config->crtc = crtcs;
    xf86_config->crtc[xf86_config->num_crtc++] = crtc;
    return crtc;
}

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void
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xf86CrtcDestroy(xf86CrtcPtr crtc)
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{
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    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(crtc->scrn);
    int c;

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    (*crtc->funcs->destroy) (crtc);
    for (c = 0; c < xf86_config->num_crtc; c++)
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        if (xf86_config->crtc[c] == crtc) {
            memmove(&xf86_config->crtc[c],
                    &xf86_config->crtc[c + 1],
                    ((xf86_config->num_crtc - (c + 1)) * sizeof(void *)));
            xf86_config->num_crtc--;
            break;
        }
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    free(crtc->params);
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    free(crtc->gamma_red);
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    free(crtc);
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}

/**
 * Return whether any outputs are connected to the specified pipe
 */

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Bool
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xf86CrtcInUse(xf86CrtcPtr crtc)
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{
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    ScrnInfoPtr pScrn = crtc->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int o;

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    for (o = 0; o < xf86_config->num_output; o++)
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        if (xf86_config->output[o]->crtc == crtc)
            return TRUE;
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    return FALSE;
}

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void
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xf86CrtcSetScreenSubpixelOrder(ScreenPtr pScreen)
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{
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    int subpixel_order = SubPixelUnknown;
    Bool has_none = FALSE;
    ScrnInfoPtr scrn = xf86Screens[pScreen->myNum];
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int c, o;
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    for (c = 0; c < xf86_config->num_crtc; c++) {
        xf86CrtcPtr crtc = xf86_config->crtc[c];

        for (o = 0; o < xf86_config->num_output; o++) {
            xf86OutputPtr output = xf86_config->output[o];

            if (output->crtc == crtc) {
                switch (output->subpixel_order) {
                case SubPixelNone:
                    has_none = TRUE;
                    break;
                case SubPixelUnknown:
                    break;
                default:
                    subpixel_order = output->subpixel_order;
                    break;
                }
            }
            if (subpixel_order != SubPixelUnknown)
                break;
        }
        if (subpixel_order != SubPixelUnknown) {
            static const int circle[4] = {
                SubPixelHorizontalRGB,
                SubPixelVerticalRGB,
                SubPixelHorizontalBGR,
                SubPixelVerticalBGR,
            };
            int rotate;
            int c;

            for (rotate = 0; rotate < 4; rotate++)
                if (crtc->rotation & (1 << rotate))
                    break;
            for (c = 0; c < 4; c++)
                if (circle[c] == subpixel_order)
                    break;
            c = (c + rotate) & 0x3;
            if ((crtc->rotation & RR_Reflect_X) && !(c & 1))
                c ^= 2;
            if ((crtc->rotation & RR_Reflect_Y) && (c & 1))
                c ^= 2;
            subpixel_order = circle[c];
            break;
        }
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    }
    if (subpixel_order == SubPixelUnknown && has_none)
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        subpixel_order = SubPixelNone;
    PictureSetSubpixelOrder(pScreen, subpixel_order);
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}

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/**
 * Sets the given video mode on the given crtc
 */
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Bool
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xf86CrtcSetModeTransform(xf86CrtcPtr crtc, DisplayModePtr mode,
                         Rotation rotation, RRTransformPtr transform, int x,
                         int y)
{
    ScrnInfoPtr scrn = crtc->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int i;
    Bool ret = FALSE;
    Bool didLock = FALSE;
    DisplayModePtr adjusted_mode;
    DisplayModeRec saved_mode;
    int saved_x, saved_y;
    Rotation saved_rotation;
    RRTransformRec saved_transform;
    Bool saved_transform_present;

    crtc->enabled = xf86CrtcInUse(crtc);
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    /* We only hit this if someone explicitly sends a "disabled" modeset. */
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    if (!crtc->enabled) {
        /* Check everything for stuff that should be off. */
        xf86DisableUnusedFunctions(scrn);
        return TRUE;
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    }

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    adjusted_mode = xf86DuplicateMode(mode);

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    saved_mode = crtc->mode;
    saved_x = crtc->x;
    saved_y = crtc->y;
    saved_rotation = crtc->rotation;
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    if (crtc->transformPresent) {
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        RRTransformInit(&saved_transform);
        RRTransformCopy(&saved_transform, &crtc->transform);
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    }
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    saved_transform_present = crtc->transformPresent;

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    /* Update crtc values up front so the driver can rely on them for mode
     * setting.
     */
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    crtc->mode = *mode;
    crtc->x = x;
    crtc->y = y;
    crtc->rotation = rotation;
    if (transform) {
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        RRTransformCopy(&crtc->transform, transform);
        crtc->transformPresent = TRUE;
    }
    else
        crtc->transformPresent = FALSE;
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    if (crtc->funcs->set_mode_major) {
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        ret = crtc->funcs->set_mode_major(crtc, mode, rotation, x, y);
        goto done;
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    }

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    didLock = crtc->funcs->lock(crtc);
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    /* Pass our mode to the outputs and the CRTC to give them a chance to
     * adjust it according to limitations or output properties, and also
     * a chance to reject the mode entirely.
     */
    for (i = 0; i < xf86_config->num_output; i++) {
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        xf86OutputPtr output = xf86_config->output[i];
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        if (output->crtc != crtc)
            continue;
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        if (!output->funcs->mode_fixup(output, mode, adjusted_mode)) {
            goto done;
        }
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    }

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    if (!crtc->funcs->mode_fixup(crtc, mode, adjusted_mode)) {
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        goto done;
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    }

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    if (!xf86CrtcRotate(crtc))
        goto done;
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    /* Prepare the outputs and CRTCs before setting the mode. */
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    for (i = 0; i < xf86_config->num_output; i++) {
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        xf86OutputPtr output = xf86_config->output[i];
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        if (output->crtc != crtc)
            continue;
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        /* Disable the output as the first thing we do. */
        output->funcs->prepare(output);
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    }

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    crtc->funcs->prepare(crtc);
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    /* Set up the DPLL and any output state that needs to adjust or depend
     * on the DPLL.
     */
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    crtc->funcs->mode_set(crtc, mode, adjusted_mode, crtc->x, crtc->y);
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    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc == crtc)
            output->funcs->mode_set(output, mode, adjusted_mode);
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    }

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    /* Only upload when needed, to avoid unneeded delays. */
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    if (!crtc->active && crtc->funcs->gamma_set)
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        crtc->funcs->gamma_set(crtc, crtc->gamma_red, crtc->gamma_green,
                               crtc->gamma_blue, crtc->gamma_size);
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    /* Now, enable the clocks, plane, pipe, and outputs that we set up. */
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    crtc->funcs->commit(crtc);
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    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc == crtc)
            output->funcs->commit(output);
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    }

    ret = TRUE;
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 done:
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    if (ret) {
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        crtc->active = TRUE;
        if (scrn->pScreen)
            xf86CrtcSetScreenSubpixelOrder(scrn->pScreen);
        if (scrn->ModeSet)
            scrn->ModeSet(scrn);
    }
    else {
        crtc->x = saved_x;
        crtc->y = saved_y;
        crtc->rotation = saved_rotation;
        crtc->mode = saved_mode;
        if (saved_transform_present)
            RRTransformCopy(&crtc->transform, &saved_transform);
        crtc->transformPresent = saved_transform_present;
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    }

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    free(adjusted_mode->name);
    free(adjusted_mode);
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    if (didLock)
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        crtc->funcs->unlock(crtc);
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    return ret;
}

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/**
 * Sets the given video mode on the given crtc, but without providing
 * a transform
 */
Bool
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xf86CrtcSetMode(xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
                int x, int y)
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{
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    return xf86CrtcSetModeTransform(crtc, mode, rotation, NULL, x, y);
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}

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/**
 * Pans the screen, does not change the mode
 */
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void
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xf86CrtcSetOrigin(xf86CrtcPtr crtc, int x, int y)
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{
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    ScrnInfoPtr scrn = crtc->scrn;

    crtc->x = x;
    crtc->y = y;
    if (crtc->funcs->set_origin) {
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        if (!xf86CrtcRotate(crtc))
            return;
        crtc->funcs->set_origin(crtc, x, y);
        if (scrn->ModeSet)
            scrn->ModeSet(scrn);
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    }
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    else
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        xf86CrtcSetMode(crtc, &crtc->mode, crtc->rotation, x, y);
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}

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/*
 * Output functions
 */

extern XF86ConfigPtr xf86configptr;

typedef enum {
    OPTION_PREFERRED_MODE,
    OPTION_POSITION,
    OPTION_BELOW,
    OPTION_RIGHT_OF,
    OPTION_ABOVE,
    OPTION_LEFT_OF,
    OPTION_ENABLE,
    OPTION_DISABLE,
    OPTION_MIN_CLOCK,
    OPTION_MAX_CLOCK,
    OPTION_IGNORE,
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    OPTION_ROTATE,
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    OPTION_PANNING,
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    OPTION_PRIMARY,
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    OPTION_DEFAULT_MODES,
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} OutputOpts;

static OptionInfoRec xf86OutputOptions[] = {
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    {OPTION_PREFERRED_MODE, "PreferredMode", OPTV_STRING, {0}, FALSE},
    {OPTION_POSITION, "Position", OPTV_STRING, {0}, FALSE},
    {OPTION_BELOW, "Below", OPTV_STRING, {0}, FALSE},
    {OPTION_RIGHT_OF, "RightOf", OPTV_STRING, {0}, FALSE},
    {OPTION_ABOVE, "Above", OPTV_STRING, {0}, FALSE},
    {OPTION_LEFT_OF, "LeftOf", OPTV_STRING, {0}, FALSE},
    {OPTION_ENABLE, "Enable", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_DISABLE, "Disable", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_MIN_CLOCK, "MinClock", OPTV_FREQ, {0}, FALSE},
    {OPTION_MAX_CLOCK, "MaxClock", OPTV_FREQ, {0}, FALSE},
    {OPTION_IGNORE, "Ignore", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_ROTATE, "Rotate", OPTV_STRING, {0}, FALSE},
    {OPTION_PANNING, "Panning", OPTV_STRING, {0}, FALSE},
    {OPTION_PRIMARY, "Primary", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_DEFAULT_MODES, "DefaultModes", OPTV_BOOLEAN, {0}, FALSE},
    {-1, NULL, OPTV_NONE, {0}, FALSE},
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};

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enum {
    OPTION_MODEDEBUG,
};

static OptionInfoRec xf86DeviceOptions[] = {
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    {OPTION_MODEDEBUG, "ModeDebug", OPTV_BOOLEAN, {0}, FALSE},
    {-1, NULL, OPTV_NONE, {0}, FALSE},
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};

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static void
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xf86OutputSetMonitor(xf86OutputPtr output)
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{
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    char *option_name;
    const char *monitor;
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    if (!output->name)
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        return;
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    free(output->options);
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    output->options = xnfalloc(sizeof(xf86OutputOptions));
    memcpy(output->options, xf86OutputOptions, sizeof(xf86OutputOptions));
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    XNFasprintf(&option_name, "monitor-%s", output->name);
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    monitor = xf86findOptionValue(output->scrn->options, option_name);
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    if (!monitor)
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        monitor = output->name;
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    else
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        xf86MarkOptionUsedByName(output->scrn->options, option_name);
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    free(option_name);
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    output->conf_monitor = xf86findMonitor(monitor,
                                           xf86configptr->conf_monitor_lst);
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    /*
     * Find the monitor section of the screen and use that
     */
    if (!output->conf_monitor && output->use_screen_monitor)
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        output->conf_monitor = xf86findMonitor(output->scrn->monitor->id,
                                               xf86configptr->conf_monitor_lst);
    if (output->conf_monitor) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s using monitor section %s\n",
                   output->name, output->conf_monitor->mon_identifier);
        xf86ProcessOptions(output->scrn->scrnIndex,
                           output->conf_monitor->mon_option_lst,
                           output->options);
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    }
    else
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        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s has no monitor section\n", output->name);
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}

static Bool
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xf86OutputEnabled(xf86OutputPtr output, Bool strict)
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{
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    Bool enable, disable;
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    /* check to see if this output was enabled in the config file */
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    if (xf86GetOptValBool(output->options, OPTION_ENABLE, &enable) && enable) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s enabled by config file\n", output->name);
        return TRUE;
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    }
    /* or if this output was disabled in the config file */
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    if (xf86GetOptValBool(output->options, OPTION_DISABLE, &disable) && disable) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s disabled by config file\n", output->name);
        return FALSE;
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    }
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    /* If not, try to only light up the ones we know are connected */
    if (strict) {
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        enable = output->status == XF86OutputStatusConnected;
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    }
    /* But if that fails, try to light up even outputs we're unsure of */
    else {
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        enable = output->status != XF86OutputStatusDisconnected;
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    }

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    xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
               "Output %s %sconnected\n", output->name, enable ? "" : "dis");
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    return enable;
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}

static Bool
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xf86OutputIgnored(xf86OutputPtr output)
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{
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    return xf86ReturnOptValBool(output->options, OPTION_IGNORE, FALSE);
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}

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static const char *direction[4] = {
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    "normal",
    "left",
    "inverted",
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    "right"
};

static Rotation
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xf86OutputInitialRotation(xf86OutputPtr output)
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{
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    char *rotate_name = xf86GetOptValString(output->options,
                                            OPTION_ROTATE);
    int i;
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    if (!rotate_name) {
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        if (output->initial_rotation)
            return output->initial_rotation;
        return RR_Rotate_0;
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    }
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    for (i = 0; i < 4; i++)
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        if (xf86nameCompare(direction[i], rotate_name) == 0)
            return 1 << i;
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    return RR_Rotate_0;
}

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xf86OutputPtr
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xf86OutputCreate(ScrnInfoPtr scrn,
                 const xf86OutputFuncsRec * funcs, const char *name)
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{
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    xf86OutputPtr output, *outputs;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int len;
    Bool primary;
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    if (name)
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        len = strlen(name) + 1;
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    else
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        len = 0;
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    output = calloc(sizeof(xf86OutputRec) + len, 1);
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    if (!output)
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        return NULL;
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    output->scrn = scrn;
    output->funcs = funcs;
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    if (name) {
        output->name = (char *) (output + 1);
        strcpy(output->name, name);
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    }
    output->subpixel_order = SubPixelUnknown;
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    /*
     * Use the old per-screen monitor section for the first output
     */
    output->use_screen_monitor = (xf86_config->num_output == 0);
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#ifdef RANDR_12_INTERFACE
    output->randr_output = NULL;
#endif
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    if (name) {
        xf86OutputSetMonitor(output);
        if (xf86OutputIgnored(output)) {
            free(output);
            return FALSE;
        }
    }

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    if (xf86_config->output)
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        outputs = realloc(xf86_config->output,
                          (xf86_config->num_output +
                           1) * sizeof(xf86OutputPtr));
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    else
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        outputs = malloc((xf86_config->num_output + 1) * sizeof(xf86OutputPtr));
    if (!outputs) {
        free(output);
        return NULL;
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    }
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    xf86_config->output = outputs;
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    if (xf86GetOptValBool(output->options, OPTION_PRIMARY, &primary) && primary) {
        memmove(xf86_config->output + 1, xf86_config->output,
                xf86_config->num_output * sizeof(xf86OutputPtr));
        xf86_config->output[0] = output;
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    }
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    else {
        xf86_config->output[xf86_config->num_output] = output;
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    }

    xf86_config->num_output++;

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    return output;
}

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Bool
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xf86OutputRename(xf86OutputPtr output, const char *name)
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{
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    char *newname = strdup(name);

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    if (!newname)
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        return FALSE;           /* so sorry... */

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    if (output->name && output->name != (char *) (output + 1))
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        free(output->name);
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    output->name = newname;
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    xf86OutputSetMonitor(output);
    if (xf86OutputIgnored(output))
        return FALSE;
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    return TRUE;
}

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void
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xf86OutputUseScreenMonitor(xf86OutputPtr output, Bool use_screen_monitor)
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{
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    if (use_screen_monitor != output->use_screen_monitor) {
        output->use_screen_monitor = use_screen_monitor;
        xf86OutputSetMonitor(output);
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    }
}

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void
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xf86OutputDestroy(xf86OutputPtr output)
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{
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    ScrnInfoPtr scrn = output->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;

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    (*output->funcs->destroy) (output);
    while (output->probed_modes)
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        xf86DeleteMode(&output->probed_modes, output->probed_modes);
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    for (o = 0; o < xf86_config->num_output; o++)
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        if (xf86_config->output[o] == output) {
            memmove(&xf86_config->output[o],
                    &xf86_config->output[o + 1],
                    ((xf86_config->num_output - (o + 1)) * sizeof(void *)));
            xf86_config->num_output--;
            break;
        }
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    if (output->name && output->name != (char *) (output + 1))
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        free(output->name);
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    free(output);
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}

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/*
 * Called during CreateScreenResources to hook up RandR
 */
static Bool
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xf86CrtcCreateScreenResources(ScreenPtr screen)
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{
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    ScrnInfoPtr scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
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    screen->CreateScreenResources = config->CreateScreenResources;

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    if (!(*screen->CreateScreenResources) (screen))
        return FALSE;

    if (!xf86RandR12CreateScreenResources(screen))
        return FALSE;
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    return TRUE;
}

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/*
 * Clean up config on server reset
 */
static Bool
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xf86CrtcCloseScreen(int index, ScreenPtr screen)
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{
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    ScrnInfoPtr scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o, c;

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    screen->CloseScreen = config->CloseScreen;

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    xf86RotateCloseScreen(screen);
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    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];
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        output->randr_output = NULL;
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    }
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    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];
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        crtc->randr_crtc = NULL;
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    }
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    xf86RandR12CloseScreen(screen);
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    return screen->CloseScreen(index, screen);
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}

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/*
 * Called at ScreenInit time to set up
 */
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#ifdef RANDR_13_INTERFACE
int
#else
Bool
#endif
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xf86CrtcScreenInit(ScreenPtr screen)
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{
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    ScrnInfoPtr scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int c;
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    /* Rotation */
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    xf86DrvMsg(scrn->scrnIndex, X_INFO,
               "RandR 1.2 enabled, ignore the following RandR disabled message.\n");
    xf86DisableRandR();         /* Disable old RandR extension support */
    xf86RandR12Init(screen);
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    /* support all rotations if every crtc has the shadow alloc funcs */
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    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];

        if (!crtc->funcs->shadow_allocate || !crtc->funcs->shadow_create)
            break;
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    }
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    if (c == config->num_crtc) {
        xf86RandR12SetRotations(screen, RR_Rotate_0 | RR_Rotate_90 |
                                RR_Rotate_180 | RR_Rotate_270 |
                                RR_Reflect_X | RR_Reflect_Y);
        xf86RandR12SetTransformSupport(screen, TRUE);
    }
    else {
        xf86RandR12SetRotations(screen, RR_Rotate_0);
        xf86RandR12SetTransformSupport(screen, FALSE);
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    }
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    /* Wrap CreateScreenResources so we can initialize the RandR code */
    config->CreateScreenResources = screen->CreateScreenResources;
    screen->CreateScreenResources = xf86CrtcCreateScreenResources;
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    config->CloseScreen = screen->CloseScreen;
    screen->CloseScreen = xf86CrtcCloseScreen;
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    /* This might still be marked wrapped from a previous generation */
    config->BlockHandler = NULL;
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#ifdef XFreeXDGA
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Keith Packard committed
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    _xf86_di_dga_init_internal(screen);
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#endif
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#ifdef RANDR_13_INTERFACE
    return RANDR_INTERFACE_VERSION;
#else
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    return TRUE;
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#endif
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}

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static DisplayModePtr
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xf86DefaultMode(xf86OutputPtr output, int width, int height)
{
    DisplayModePtr target_mode = NULL;
    DisplayModePtr mode;
    int target_diff = 0;
    int target_preferred = 0;
    int mm_height;

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    mm_height = output->mm_height;
    if (!mm_height)
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        mm_height = (768 * 25.4) / DEFAULT_DPI;
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    /*
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     * Pick a mode closest to DEFAULT_DPI
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     */
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    for (mode = output->probed_modes; mode; mode = mode->next) {
        int dpi;
        int preferred = (((mode->type & M_T_PREFERRED) != 0) +
                         ((mode->type & M_T_USERPREF) != 0));
        int diff;

        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;

        /* yes, use VDisplay here, not xf86ModeHeight */
        dpi = (mode->VDisplay * 254) / (mm_height * 10);
        diff = dpi - DEFAULT_DPI;
        diff = diff < 0 ? -diff : diff;
        if (target_mode == NULL || (preferred > target_preferred) ||
            (preferred == target_preferred && diff < target_diff)) {
            target_mode = mode;
            target_diff = diff;
            target_preferred = preferred;
        }
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    }
    return target_mode;
}

static DisplayModePtr
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xf86ClosestMode(xf86OutputPtr output,
                DisplayModePtr match, Rotation match_rotation,
                int width, int height)
{
    DisplayModePtr target_mode = NULL;
    DisplayModePtr mode;
    int target_diff = 0;

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    /*
     * Pick a mode closest to the specified mode
     */
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    for (mode = output->probed_modes; mode; mode = mode->next) {
        int dx, dy;
        int diff;

        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;

        /* exact matches are preferred */
        if (output->initial_rotation == match_rotation &&
            xf86ModesEqual(mode, match))
            return mode;

        dx = xf86ModeWidth(match, match_rotation) - xf86ModeWidth(mode,
                                                                  output->
                                                                  initial_rotation);
        dy = xf86ModeHeight(match, match_rotation) - xf86ModeHeight(mode,
                                                                    output->
                                                                    initial_rotation);
        diff = dx * dx + dy * dy;
        if (target_mode == NULL || diff < target_diff) {
            target_mode = mode;
            target_diff = diff;
        }
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    }
    return target_mode;
}

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static DisplayModePtr
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xf86OutputHasPreferredMode(xf86OutputPtr output, int width, int height)
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{
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    DisplayModePtr mode;
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    for (mode = output->probed_modes; mode; mode = mode->next) {
        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;
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        if (mode->type & M_T_PREFERRED)
            return mode;
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    }
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    return NULL;
}

static DisplayModePtr
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xf86OutputHasUserPreferredMode(xf86OutputPtr output)
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{
    DisplayModePtr mode, first = output->probed_modes;

    for (mode = first; mode && mode->next != first; mode = mode->next)
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        if (mode->type & M_T_USERPREF)
            return mode;
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    return NULL;
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}

static int
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xf86PickCrtcs(ScrnInfoPtr scrn,
              xf86CrtcPtr * best_crtcs,
              DisplayModePtr * modes, int n, int width, int height)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int c, o;
    xf86OutputPtr output;
    xf86CrtcPtr crtc;
    xf86CrtcPtr *crtcs;
    xf86CrtcPtr best_crtc;
    int best_score;
    int score;
    int my_score;

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    if (n == config->num_output)
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        return 0;
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    output = config->output[n];
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    /*
     * Compute score with this output disabled
     */
    best_crtcs[n] = NULL;
    best_crtc = NULL;
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    best_score = xf86PickCrtcs(scrn, best_crtcs, modes, n + 1, width, height);
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    if (modes[n] == NULL)
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        return best_score;

    crtcs = malloc(config->num_output * sizeof(xf86CrtcPtr));
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    if (!crtcs)
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        return best_score;
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    my_score = 1;
    /* Score outputs that are known to be connected higher */
    if (output->status == XF86OutputStatusConnected)
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        my_score++;
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    /* Score outputs with preferred modes higher */
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    if (xf86OutputHasPreferredMode(output, width, height))
        my_score++;
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    /*
     * Select a crtc for this output and
     * then attempt to configure the remaining
     * outputs
     */
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    for (c = 0; c < config->num_crtc; c++) {
        if ((output->possible_crtcs & (1 << c)) == 0)
            continue;

        crtc = config->crtc[c];
        /*
         * Check to see if some other output is
         * using this crtc
         */
        for (o = 0; o < n; o++)
            if (best_crtcs[o] == crtc)
                break;
        if (o < n) {
            /*
             * If the two outputs desire the same mode,
             * see if they can be cloned
             */
            if (xf86ModesEqual(modes[o], modes[n]) &&
                config->output[o]->initial_rotation ==
                config->output[n]->initial_rotation &&
                config->output[o]->initial_x == config->output[n]->initial_x &&
                config->output[o]->initial_y == config->output[n]->initial_y) {
                if ((output->possible_clones & (1 << o)) == 0)
                    continue;   /* nope, try next CRTC */
            }
            else
                continue;       /* different modes, can't clone */
        }
        crtcs[n] = crtc;
        memcpy(crtcs, best_crtcs, n * sizeof(xf86CrtcPtr));
        score =
            my_score + xf86PickCrtcs(scrn, crtcs, modes, n + 1, width, height);
        if (score > best_score) {
            best_crtc = crtc;
            best_score = score;
            memcpy(best_crtcs, crtcs, config->num_output * sizeof(xf86CrtcPtr));
        }
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    }
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    free(crtcs);
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    return best_score;
}

/*
 * Compute the virtual size necessary to place all of the available
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 * crtcs in the specified configuration.
 *
 * canGrow indicates that the driver can make the screen larger than its initial
 * configuration.  If FALSE, this function will enlarge the screen to include
 * the largest available mode.
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 */

static void
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