#include "config.h"

#include "gskvulkanclipprivate.h"

#include "gskroundedrectprivate.h"

void
gsk_vulkan_clip_init_empty (GskVulkanClip         *clip,
                            const graphene_rect_t *rect)
{
  clip->type = GSK_VULKAN_CLIP_NONE;
  gsk_rounded_rect_init_from_rect (&clip->rect, rect, 0);
}

static void
gsk_vulkan_clip_init_copy (GskVulkanClip *self,
                           const GskVulkanClip *src)
{
  self->type = src->type;
  gsk_rounded_rect_init_copy (&self->rect, &src->rect);
}

gboolean
gsk_vulkan_clip_intersect_rect (GskVulkanClip         *dest,
                                const GskVulkanClip   *src,
                                const graphene_rect_t *rect)
{
  if (graphene_rect_contains_rect (rect, &src->rect.bounds))
    {
      gsk_vulkan_clip_init_copy (dest, src);
      return TRUE;
    }
  if (!graphene_rect_intersection (rect, &src->rect.bounds, NULL))
    {
      dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      return TRUE;
    }

  switch (src->type)
    {
    case GSK_VULKAN_CLIP_ALL_CLIPPED:
      dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      break;

    case GSK_VULKAN_CLIP_NONE:
      gsk_vulkan_clip_init_copy (dest, src);
      if (graphene_rect_intersection (&dest->rect.bounds, rect, &dest->rect.bounds))
        dest->type = GSK_VULKAN_CLIP_RECT;
      else
        dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      break;

    case GSK_VULKAN_CLIP_RECT:
      gsk_vulkan_clip_init_copy (dest, src);
      if (!graphene_rect_intersection (&dest->rect.bounds, rect, &dest->rect.bounds))
        dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      break;

    case GSK_VULKAN_CLIP_ROUNDED_CIRCULAR:
    case GSK_VULKAN_CLIP_ROUNDED:
      if (gsk_rounded_rect_contains_rect (&src->rect, rect))
        {
          dest->type = GSK_VULKAN_CLIP_RECT;
          gsk_rounded_rect_init_from_rect (&dest->rect, rect, 0);
        }
      else
        {
          /* some points of rect are inside src's rounded rect,
           * some are outside. */
          /* XXX: If the 2 rects don't intersect on rounded corners,
           * we could actually compute a new clip here.
           */
          return FALSE;
        }

    default:
      g_assert_not_reached ();
      return FALSE;
    }

  return TRUE;
}

gboolean
gsk_vulkan_clip_intersect_rounded_rect (GskVulkanClip        *dest,
                                        const GskVulkanClip  *src,
                                        const GskRoundedRect *rounded)
{
  if (gsk_rounded_rect_contains_rect (rounded, &src->rect.bounds))
    {
      gsk_vulkan_clip_init_copy (dest, src);
      return TRUE;
    }
  if (!graphene_rect_intersection (&rounded->bounds, &src->rect.bounds, NULL))
    {
      dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      return TRUE;
    }

  switch (src->type)
    {
    case GSK_VULKAN_CLIP_ALL_CLIPPED:
      dest->type = GSK_VULKAN_CLIP_ALL_CLIPPED;
      break;

    case GSK_VULKAN_CLIP_NONE:
      dest->type = gsk_rounded_rect_is_circular (&dest->rect) ? GSK_VULKAN_CLIP_ROUNDED_CIRCULAR : GSK_VULKAN_CLIP_ROUNDED;
      gsk_rounded_rect_init_copy (&dest->rect, rounded);
      break;

    case GSK_VULKAN_CLIP_RECT:
      if (graphene_rect_contains_rect (&src->rect.bounds, &rounded->bounds))
        {
          dest->type = gsk_rounded_rect_is_circular (&dest->rect) ? GSK_VULKAN_CLIP_ROUNDED_CIRCULAR : GSK_VULKAN_CLIP_ROUNDED;
          gsk_rounded_rect_init_copy (&dest->rect, rounded);
          return TRUE;
        }
      /* some points of rect are inside src's rounded rect,
       * some are outside. */
      /* XXX: If the 2 rects don't intersect on rounded corners,
       * we could actually compute a new clip here.
       */
      return FALSE;

    case GSK_VULKAN_CLIP_ROUNDED_CIRCULAR:
    case GSK_VULKAN_CLIP_ROUNDED:
      /* XXX: improve */
      return FALSE;

    default:
      g_assert_not_reached ();
      return FALSE;
    }

  return TRUE;
}

gboolean
gsk_vulkan_clip_transform (GskVulkanClip           *dest,
                           const GskVulkanClip     *src,
                           const graphene_matrix_t *transform,
                           const graphene_rect_t   *viewport)
{
  switch (src->type)
    {
    default:
      g_assert_not_reached();
      return FALSE;

    case GSK_VULKAN_CLIP_ALL_CLIPPED:
      gsk_vulkan_clip_init_copy (dest, src);
      return TRUE;

    case GSK_VULKAN_CLIP_NONE:
      gsk_vulkan_clip_init_empty (dest, viewport);
      return TRUE;

    case GSK_VULKAN_CLIP_RECT:
    case GSK_VULKAN_CLIP_ROUNDED_CIRCULAR:
    case GSK_VULKAN_CLIP_ROUNDED:
      /* FIXME: Handle 2D operations, in particular transform and scale */
      return FALSE;
    }
}

gboolean
gsk_vulkan_clip_contains_rect (const GskVulkanClip   *self,
                               const graphene_rect_t *rect)
{
  switch (self->type)
    {
    default:
      g_assert_not_reached();
    case GSK_VULKAN_CLIP_ALL_CLIPPED:
      return FALSE;

    case GSK_VULKAN_CLIP_NONE:
      return TRUE;

    case GSK_VULKAN_CLIP_RECT:
      return graphene_rect_contains_rect (&self->rect.bounds, rect);

    case GSK_VULKAN_CLIP_ROUNDED_CIRCULAR:
    case GSK_VULKAN_CLIP_ROUNDED:
      return gsk_rounded_rect_contains_rect (&self->rect, rect);
    }
}