/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * Offscreen Bitmap Cache

 *

 * Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <freerdp/config.h>

#include <stdio.h>

#include <winpr/crt.h>

#include <winpr/assert.h>

#include <winpr/stream.h>

#include <freerdp/log.h>

#include "../core/graphics.h"

#include "offscreen.h"

#include "cache.h"

#define TAG FREERDP_TAG("cache.offscreen")

struct rdp_offscreen_cache

{

  UINT32 maxSize;        /* 0 */

  UINT32 maxEntries;     /* 1 */

  rdpBitmap** entries;   /* 2 */

  UINT32 currentSurface; /* 3 */

  rdpContext* context;

};

static void offscreen_cache_put(rdpOffscreenCache* offscreen_cache, UINT32 index,

                                rdpBitmap* bitmap);

static void offscreen_cache_delete(rdpOffscreenCache* offscreen, UINT32 index);

static BOOL

update_gdi_create_offscreen_bitmap(rdpContext* context,

                                   const CREATE_OFFSCREEN_BITMAP_ORDER* createOffscreenBitmap)

{

  UINT32 i;

  UINT16 index;

  rdpBitmap* bitmap;

  rdpCache* cache;

  if (!context || !createOffscreenBitmap || !context->cache)

    return FALSE;

  cache = context->cache;

  bitmap = Bitmap_Alloc(context);

  if (!bitmap)

    return FALSE;

  Bitmap_SetDimensions(bitmap, createOffscreenBitmap->cx, createOffscreenBitmap->cy);

  if (!bitmap->New(context, bitmap))

  {

    Bitmap_Free(context, bitmap);

    return FALSE;

  }

  offscreen_cache_delete(cache->offscreen, createOffscreenBitmap->id);

  offscreen_cache_put(cache->offscreen, createOffscreenBitmap->id, bitmap);

  if (cache->offscreen->currentSurface == createOffscreenBitmap->id)

    bitmap->SetSurface(context, bitmap, FALSE);

  for (i = 0; i < createOffscreenBitmap->deleteList.cIndices; i++)

  {

    index = createOffscreenBitmap->deleteList.indices[i];

    offscreen_cache_delete(cache->offscreen, index);

  }

  return TRUE;

}

static BOOL update_gdi_switch_surface(rdpContext* context,

                                      const SWITCH_SURFACE_ORDER* switchSurface)

{

  rdpCache* cache;

  rdpBitmap* bitmap;

  if (!context || !context->cache || !switchSurface || !context->graphics)

    return FALSE;

  cache = context->cache;

  bitmap = context->graphics->Bitmap_Prototype;

  if (!bitmap)

    return FALSE;

  if (switchSurface->bitmapId == SCREEN_BITMAP_SURFACE)

  {

    bitmap->SetSurface(context, NULL, TRUE);

  }

  else

  {

    rdpBitmap* bmp;

    bmp = offscreen_cache_get(cache->offscreen, switchSurface->bitmapId);

    if (bmp == NULL)

      return FALSE;

    bitmap->SetSurface(context, bmp, FALSE);

  }

  cache->offscreen->currentSurface = switchSurface->bitmapId;

  return TRUE;

}

rdpBitmap* offscreen_cache_get(rdpOffscreenCache* offscreenCache, UINT32 index)

{

  rdpBitmap* bitmap;

  WINPR_ASSERT(offscreenCache);

  if (index >= offscreenCache->maxEntries)

  {

    WLog_ERR(TAG, "invalid offscreen bitmap index: 0x%08" PRIX32 "", index);

    return NULL;

  }

  bitmap = offscreenCache->entries[index];

  if (!bitmap)

  {

    WLog_ERR(TAG, "invalid offscreen bitmap at index: 0x%08" PRIX32 "", index);

    return NULL;

  }

  return bitmap;

}

void offscreen_cache_put(rdpOffscreenCache* offscreenCache, UINT32 index, rdpBitmap* bitmap)

{

  WINPR_ASSERT(offscreenCache);

  if (index >= offscreenCache->maxEntries)

  {

    WLog_ERR(TAG, "invalid offscreen bitmap index: 0x%08" PRIX32 "", index);

    return;

  }

  offscreen_cache_delete(offscreenCache, index);

  offscreenCache->entries[index] = bitmap;

}

void offscreen_cache_delete(rdpOffscreenCache* offscreenCache, UINT32 index)

{

  rdpBitmap* prevBitmap;

  WINPR_ASSERT(offscreenCache);

  if (index >= offscreenCache->maxEntries)

  {

    WLog_ERR(TAG, "invalid offscreen bitmap index (delete): 0x%08" PRIX32 "", index);

    return;

  }

  prevBitmap = offscreenCache->entries[index];

  if (prevBitmap != NULL)

    Bitmap_Free(offscreenCache->context, prevBitmap);

  offscreenCache->entries[index] = NULL;

}

void offscreen_cache_register_callbacks(rdpUpdate* update)

{

  WINPR_ASSERT(update);

  WINPR_ASSERT(update->altsec);

  update->altsec->CreateOffscreenBitmap = update_gdi_create_offscreen_bitmap;

  update->altsec->SwitchSurface = update_gdi_switch_surface;

}

rdpOffscreenCache* offscreen_cache_new(rdpContext* context)

{

  rdpOffscreenCache* offscreenCache;

  rdpSettings* settings;

  WINPR_ASSERT(context);

  settings = context->settings;

  WINPR_ASSERT(settings);

  offscreenCache = (rdpOffscreenCache*)calloc(1, sizeof(rdpOffscreenCache));

  if (!offscreenCache)

    return NULL;

  offscreenCache->context = context;

  offscreenCache->currentSurface = SCREEN_BITMAP_SURFACE;

  offscreenCache->maxSize = 7680;

  offscreenCache->maxEntries = 2000;

  if (!freerdp_settings_set_uint32(settings, FreeRDP_OffscreenCacheSize, offscreenCache->maxSize))

    goto fail;

  if (!freerdp_settings_set_uint32(settings, FreeRDP_OffscreenCacheEntries,

                                   offscreenCache->maxEntries))

    goto fail;

  offscreenCache->entries = (rdpBitmap**)calloc(offscreenCache->maxEntries, sizeof(rdpBitmap*));

  if (!offscreenCache->entries)

    goto fail;

  return offscreenCache;

fail:

  offscreen_cache_free(offscreenCache);

  return NULL;

}

void offscreen_cache_free(rdpOffscreenCache* offscreenCache)

{

  if (offscreenCache)

  {

    size_t i;

    if (offscreenCache->entries)

    {

      for (i = 0; i < offscreenCache->maxEntries; i++)

      {

        rdpBitmap* bitmap = offscreenCache->entries[i];

        Bitmap_Free(offscreenCache->context, bitmap);

      }

    }

    free(offscreenCache->entries);

    free(offscreenCache);

  }

}