/*
 * Copyright 2011 Red Hat, 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
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, 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 (including the next
 * paragraph) 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS 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.
 */

#include <linux/dma-buf-map.h>

#include <drm/drm_fourcc.h>

#include "qxl_drv.h"
#include "qxl_object.h"

static int alloc_clips(struct qxl_device *qdev,
                       struct qxl_release *release,
                       unsigned int num_clips,
                       struct qxl_bo **clips_bo)
{
        int size = sizeof(struct qxl_clip_rects) + sizeof(struct qxl_rect) * num_clips;

        return qxl_alloc_bo_reserved(qdev, release, size, clips_bo);
}

/* returns a pointer to the already allocated qxl_rect array inside
 * the qxl_clip_rects. This is *not* the same as the memory allocated
 * on the device, it is offset to qxl_clip_rects.chunk.data */
static struct qxl_rect *drawable_set_clipping(struct qxl_device *qdev,
                                              unsigned int num_clips,
                                              struct qxl_bo *clips_bo)
{
        struct dma_buf_map map;
        struct qxl_clip_rects *dev_clips;
        int ret;

        ret = qxl_bo_kmap(clips_bo, &map);
        if (ret)
                return NULL;
        dev_clips = map.vaddr; /* TODO: Use mapping abstraction properly */

        dev_clips->num_rects = num_clips;
        dev_clips->chunk.next_chunk = 0;
        dev_clips->chunk.prev_chunk = 0;
        dev_clips->chunk.data_size = sizeof(struct qxl_rect) * num_clips;
        return (struct qxl_rect *)dev_clips->chunk.data;
}

static int
alloc_drawable(struct qxl_device *qdev, struct qxl_release **release)
{
        return qxl_alloc_release_reserved(qdev, sizeof(struct qxl_drawable),
                                          QXL_RELEASE_DRAWABLE, release, NULL);
}

static void
free_drawable(struct qxl_device *qdev, struct qxl_release *release)
{
        qxl_release_free(qdev, release);
}

/* release needs to be reserved at this point */
static int
make_drawable(struct qxl_device *qdev, int surface, uint8_t type,
              const struct qxl_rect *rect,
              struct qxl_release *release)
{
        struct qxl_drawable *drawable;
        int i;

        drawable = (struct qxl_drawable *)qxl_release_map(qdev, release);
        if (!drawable)
                return -ENOMEM;

        drawable->type = type;

        drawable->surface_id = surface;         /* Only primary for now */
        drawable->effect = QXL_EFFECT_OPAQUE;
        drawable->self_bitmap = 0;
        drawable->self_bitmap_area.top = 0;
        drawable->self_bitmap_area.left = 0;
        drawable->self_bitmap_area.bottom = 0;
        drawable->self_bitmap_area.right = 0;
        /* FIXME: add clipping */
        drawable->clip.type = SPICE_CLIP_TYPE_NONE;

        /*
         * surfaces_dest[i] should apparently be filled out with the
         * surfaces that we depend on, and surface_rects should be
         * filled with the rectangles of those surfaces that we
         * are going to use.
         */
        for (i = 0; i < 3; ++i)
                drawable->surfaces_dest[i] = -1;

        if (rect)
                drawable->bbox = *rect;

        drawable->mm_time = qdev->rom->mm_clock;
        qxl_release_unmap(qdev, release, &drawable->release_info);
        return 0;
}

/* push a draw command using the given clipping rectangles as
 * the sources from the shadow framebuffer.
 *
 * Right now implementing with a single draw and a clip list. Clip
 * lists are known to be a problem performance wise, this can be solved
 * by treating them differently in the server.
 */
void qxl_draw_dirty_fb(struct qxl_device *qdev,
                       struct drm_framebuffer *fb,
                       struct qxl_bo *bo,
                       unsigned int flags, unsigned int color,
                       struct drm_clip_rect *clips,
                       unsigned int num_clips, int inc,
                       uint32_t dumb_shadow_offset)
{
        /*
         * TODO: if flags & DRM_MODE_FB_DIRTY_ANNOTATE_FILL then we should
         * send a fill command instead, much cheaper.
         *
         * See include/drm/drm_mode.h
         */
        struct drm_clip_rect *clips_ptr;
        int i;
        int left, right, top, bottom;
        int width, height;
        struct qxl_drawable *drawable;
        struct qxl_rect drawable_rect;
        struct qxl_rect *rects;
        int stride = fb->pitches[0];
        /* depth is not actually interesting, we don't mask with it */
        int depth = fb->format->cpp[0] * 8;
        struct dma_buf_map surface_map;
        uint8_t *surface_base;
        struct qxl_release *release;
        struct qxl_bo *clips_bo;
        struct qxl_drm_image *dimage;
        int ret;

        ret = alloc_drawable(qdev, &release);
        if (ret)
                return;

        clips->x1 += dumb_shadow_offset;
        clips->x2 += dumb_shadow_offset;

        left = clips->x1;
        right = clips->x2;
        top = clips->y1;
        bottom = clips->y2;

        /* skip the first clip rect */
        for (i = 1, clips_ptr = clips + inc;
             i < num_clips; i++, clips_ptr += inc) {
                left = min_t(int, left, (int)clips_ptr->x1);
                right = max_t(int, right, (int)clips_ptr->x2);
                top = min_t(int, top, (int)clips_ptr->y1);
                bottom = max_t(int, bottom, (int)clips_ptr->y2);
        }

        width = right - left;
        height = bottom - top;

        ret = alloc_clips(qdev, release, num_clips, &clips_bo);
        if (ret)
                goto out_free_drawable;

        ret = qxl_image_alloc_objects(qdev, release,
                                      &dimage,
                                      height, stride);
        if (ret)
                goto out_free_clips;

        /* do a reservation run over all the objects we just allocated */
        ret = qxl_release_reserve_list(release, true);
        if (ret)
                goto out_free_image;

        drawable_rect.left = left;
        drawable_rect.right = right;
        drawable_rect.top = top;
        drawable_rect.bottom = bottom;

        ret = make_drawable(qdev, 0, QXL_DRAW_COPY, &drawable_rect,
                            release);
        if (ret)
                goto out_release_backoff;

        ret = qxl_bo_kmap(bo, &surface_map);
        if (ret)
                goto out_release_backoff;
        surface_base = surface_map.vaddr; /* TODO: Use mapping abstraction properly */

        ret = qxl_image_init(qdev, release, dimage, surface_base,
                             left - dumb_shadow_offset,
                             top, width, height, depth, stride);
        qxl_bo_kunmap(bo);
        if (ret)
                goto out_release_backoff;

        rects = drawable_set_clipping(qdev, num_clips, clips_bo);
        if (!rects) {
                ret = -EINVAL;
                goto out_release_backoff;
        }
        drawable = (struct qxl_drawable *)qxl_release_map(qdev, release);

        drawable->clip.type = SPICE_CLIP_TYPE_RECTS;
        drawable->clip.data = qxl_bo_physical_address(qdev,
                                                      clips_bo, 0);

        drawable->u.copy.src_area.top = 0;
        drawable->u.copy.src_area.bottom = height;
        drawable->u.copy.src_area.left = 0;
        drawable->u.copy.src_area.right = width;

        drawable->u.copy.rop_descriptor = SPICE_ROPD_OP_PUT;
        drawable->u.copy.scale_mode = 0;
        drawable->u.copy.mask.flags = 0;
        drawable->u.copy.mask.pos.x = 0;
        drawable->u.copy.mask.pos.y = 0;
        drawable->u.copy.mask.bitmap = 0;

        drawable->u.copy.src_bitmap = qxl_bo_physical_address(qdev, dimage->bo, 0);
        qxl_release_unmap(qdev, release, &drawable->release_info);

        clips_ptr = clips;
        for (i = 0; i < num_clips; i++, clips_ptr += inc) {
                rects[i].left   = clips_ptr->x1;
                rects[i].right  = clips_ptr->x2;
                rects[i].top    = clips_ptr->y1;
                rects[i].bottom = clips_ptr->y2;
        }
        qxl_bo_kunmap(clips_bo);

        qxl_release_fence_buffer_objects(release);
        qxl_push_command_ring_release(qdev, release, QXL_CMD_DRAW, false);

out_release_backoff:
        if (ret)
                qxl_release_backoff_reserve_list(release);
out_free_image:
        qxl_image_free_objects(qdev, dimage);
out_free_clips:
        qxl_bo_unref(&clips_bo);
out_free_drawable:
        /* only free drawable on error */
        if (ret)
                free_drawable(qdev, release);

}