/*
 * qxl local rendering (aka display on sdl/vnc)
 *
 * Copyright (C) 2010 Red Hat, Inc.
 *
 * maintained by Gerd Hoffmann <kraxel@redhat.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 or
 * (at your option) version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qxl.h"

static void qxl_flip(PCIQXLDevice *qxl, QXLRect *rect)
{
    uint8_t *src = qxl->guest_primary.data;
    uint8_t *dst = qxl->guest_primary.flipped;
    int len, i;

    src += (qxl->guest_primary.surface.height - rect->top - 1) *
        qxl->guest_primary.abs_stride;
    dst += rect->top  * qxl->guest_primary.abs_stride;
    src += rect->left * qxl->guest_primary.bytes_pp;
    dst += rect->left * qxl->guest_primary.bytes_pp;
    len  = (rect->right - rect->left) * qxl->guest_primary.bytes_pp;

    for (i = rect->top; i < rect->bottom; i++) {
        memcpy(dst, src, len);
        dst += qxl->guest_primary.abs_stride;
        src -= qxl->guest_primary.abs_stride;
    }
}

void qxl_render_resize(PCIQXLDevice *qxl)
{
    QXLSurfaceCreate *sc = &qxl->guest_primary.surface;

    qxl->guest_primary.qxl_stride = sc->stride;
    qxl->guest_primary.abs_stride = abs(sc->stride);
    qxl->guest_primary.resized++;
    switch (sc->format) {
    case SPICE_SURFACE_FMT_16_555:
        qxl->guest_primary.bytes_pp = 2;
        qxl->guest_primary.bits_pp = 15;
        break;
    case SPICE_SURFACE_FMT_16_565:
        qxl->guest_primary.bytes_pp = 2;
        qxl->guest_primary.bits_pp = 16;
        break;
    case SPICE_SURFACE_FMT_32_xRGB:
    case SPICE_SURFACE_FMT_32_ARGB:
        qxl->guest_primary.bytes_pp = 4;
        qxl->guest_primary.bits_pp = 32;
        break;
    default:
        fprintf(stderr, "%s: unhandled format: %x\n", __FUNCTION__,
                qxl->guest_primary.surface.format);
        qxl->guest_primary.bytes_pp = 4;
        qxl->guest_primary.bits_pp = 32;
        break;
    }
}

void qxl_render_update(PCIQXLDevice *qxl)
{
    VGACommonState *vga = &qxl->vga;
    QXLRect dirty[32], update;
    void *ptr;
    int i, redraw = 0;

    if (!is_buffer_shared(vga->ds->surface)) {
        dprint(qxl, 1, "%s: restoring shared displaysurface\n", __func__);
        qxl->guest_primary.resized++;
        qxl->guest_primary.commands++;
        redraw = 1;
    }

    if (qxl->guest_primary.resized) {
        qxl->guest_primary.resized = 0;

        if (qxl->guest_primary.flipped) {
            g_free(qxl->guest_primary.flipped);
            qxl->guest_primary.flipped = NULL;
        }
        qemu_free_displaysurface(vga->ds);

        qxl->guest_primary.data = memory_region_get_ram_ptr(&qxl->vga.vram);
        if (qxl->guest_primary.qxl_stride < 0) {
            /* spice surface is upside down -> need extra buffer to flip */
            qxl->guest_primary.flipped =
                g_malloc(qxl->guest_primary.surface.width *
                         qxl->guest_primary.abs_stride);
            ptr = qxl->guest_primary.flipped;
        } else {
            ptr = qxl->guest_primary.data;
        }
        dprint(qxl, 1, "%s: %dx%d, stride %d, bpp %d, depth %d, flip %s\n",
               __FUNCTION__,
               qxl->guest_primary.surface.width,
               qxl->guest_primary.surface.height,
               qxl->guest_primary.qxl_stride,
               qxl->guest_primary.bytes_pp,
               qxl->guest_primary.bits_pp,
               qxl->guest_primary.flipped ? "yes" : "no");
        vga->ds->surface =
            qemu_create_displaysurface_from(qxl->guest_primary.surface.width,
                                            qxl->guest_primary.surface.height,
                                            qxl->guest_primary.bits_pp,
                                            qxl->guest_primary.abs_stride,
                                            ptr);
        dpy_resize(vga->ds);
    }

    update.left   = 0;
    update.right  = qxl->guest_primary.surface.width;
    update.top    = 0;
    update.bottom = qxl->guest_primary.surface.height;

    memset(dirty, 0, sizeof(dirty));
    if (runstate_is_running() && qxl->guest_primary.commands) {
        qxl->guest_primary.commands = 0;
        qxl_spice_update_area(qxl, 0, &update,
                              dirty, ARRAY_SIZE(dirty), 1, QXL_SYNC);
    }
    if (redraw) {
        memset(dirty, 0, sizeof(dirty));
        dirty[0] = update;
    }

    for (i = 0; i < ARRAY_SIZE(dirty); i++) {
        if (qemu_spice_rect_is_empty(dirty+i)) {
            break;
        }
        if (qxl->guest_primary.flipped) {
            qxl_flip(qxl, dirty+i);
        }
        dpy_update(vga->ds,
                   dirty[i].left, dirty[i].top,
                   dirty[i].right - dirty[i].left,
                   dirty[i].bottom - dirty[i].top);
    }
}

static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor)
{
    QEMUCursor *c;
    uint8_t *image, *mask;
    size_t size;

    c = cursor_alloc(cursor->header.width, cursor->header.height);
    c->hot_x = cursor->header.hot_spot_x;
    c->hot_y = cursor->header.hot_spot_y;
    switch (cursor->header.type) {
    case SPICE_CURSOR_TYPE_ALPHA:
        size = cursor->header.width * cursor->header.height * sizeof(uint32_t);
        memcpy(c->data, cursor->chunk.data, size);
        if (qxl->debug > 2) {
            cursor_print_ascii_art(c, "qxl/alpha");
        }
        break;
    case SPICE_CURSOR_TYPE_MONO:
        mask  = cursor->chunk.data;
        image = mask + cursor_get_mono_bpl(c) * c->width;
        cursor_set_mono(c, 0xffffff, 0x000000, image, 1, mask);
        if (qxl->debug > 2) {
            cursor_print_ascii_art(c, "qxl/mono");
        }
        break;
    default:
        fprintf(stderr, "%s: not implemented: type %d\n",
                __FUNCTION__, cursor->header.type);
        goto fail;
    }
    return c;

fail:
    cursor_put(c);
    return NULL;
}


/* called from spice server thread context only */
void qxl_render_cursor(PCIQXLDevice *qxl, QXLCommandExt *ext)
{
    QXLCursorCmd *cmd = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id);
    QXLCursor *cursor;
    QEMUCursor *c;

    if (!qxl->ssd.ds->mouse_set || !qxl->ssd.ds->cursor_define) {
        return;
    }

    if (qxl->debug > 1 && cmd->type != QXL_CURSOR_MOVE) {
        fprintf(stderr, "%s", __FUNCTION__);
        qxl_log_cmd_cursor(qxl, cmd, ext->group_id);
        fprintf(stderr, "\n");
    }
    switch (cmd->type) {
    case QXL_CURSOR_SET:
        cursor = qxl_phys2virt(qxl, cmd->u.set.shape, ext->group_id);
        if (cursor->chunk.data_size != cursor->data_size) {
            fprintf(stderr, "%s: multiple chunks\n", __FUNCTION__);
            return;
        }
        c = qxl_cursor(qxl, cursor);
        if (c == NULL) {
            c = cursor_builtin_left_ptr();
        }
        qemu_mutex_lock(&qxl->ssd.lock);
        if (qxl->ssd.cursor) {
            cursor_put(qxl->ssd.cursor);
        }
        qxl->ssd.cursor = c;
        qxl->ssd.mouse_x = cmd->u.set.position.x;
        qxl->ssd.mouse_y = cmd->u.set.position.y;
        qemu_mutex_unlock(&qxl->ssd.lock);
        break;
    case QXL_CURSOR_MOVE:
        qemu_mutex_lock(&qxl->ssd.lock);
        qxl->ssd.mouse_x = cmd->u.position.x;
        qxl->ssd.mouse_y = cmd->u.position.y;
        qemu_mutex_unlock(&qxl->ssd.lock);
        break;
    }
}