Merge branch 'devel' of github.com:/neutrinolabs/xrdp into devel

5 files changed, 421 insertions, 201 deletions

diff --git a/xrdp/xrdp.h b/xrdp/xrdp.h
index 5dc20ecd..0812a74f 100644
--- a/xrdp/xrdp.h
+++ b/xrdp/xrdp.h
@@ -26,6 +26,7 @@
 #include "parse.h"
 #include "trans.h"
 #include "list.h"
+#include "list16.h"
 #include "libxrdpinc.h"
 #include "xrdp_constants.h"
 #include "xrdp_types.h"
@@ -206,6 +207,8 @@ xrdp_bitmap_copy_box(struct xrdp_bitmap* self,
                      struct xrdp_bitmap* dest,
                      int x, int y, int cx, int cy);
 int APP_CC
+xrdp_bitmap_hash_crc(struct xrdp_bitmap *self);
+int APP_CC
 xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap* self,
                               struct xrdp_bitmap* dest,
                               int x, int y, int cx, int cy);
@@ -213,9 +216,6 @@ int APP_CC
 xrdp_bitmap_compare(struct xrdp_bitmap* self,
                     struct xrdp_bitmap* b);
 int APP_CC
-xrdp_bitmap_compare_with_crc(struct xrdp_bitmap* self,
-                             struct xrdp_bitmap* b);
-int APP_CC
 xrdp_bitmap_invalidate(struct xrdp_bitmap* self, struct xrdp_rect* rect);
 int APP_CC
 xrdp_bitmap_def_proc(struct xrdp_bitmap* self, int msg,
diff --git a/xrdp/xrdp_bitmap.c b/xrdp/xrdp_bitmap.c
index 46fb6401..49750221 100644
--- a/xrdp/xrdp_bitmap.c
+++ b/xrdp/xrdp_bitmap.c
@@ -23,9 +23,22 @@
 
 #include "xrdp.h"
 #include "log.h"
-
-static int g_crc_seed = 0xffffffff;
-static int g_crc_table[256] =
+#include "crc16.h"
+
+#define LLOG_LEVEL 1
+#define LLOGLN(_level, _args) \
+  do \
+  { \
+    if (_level < LLOG_LEVEL) \
+    { \
+        g_write("xrdp:xrdp_bitmap [%10.10u]: ", g_time3()); \
+        g_writeln _args ; \
+    } \
+  } \
+  while (0)
+
+
+static const int g_crc_table[256] =
 {
     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
     0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
@@ -72,10 +85,10 @@ static int g_crc_table[256] =
     0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 };
 
-#define CRC_START(in_crc) (in_crc) = g_crc_seed
+#define CRC_START(in_crc) (in_crc) = 0xFFFFFFFF
 #define CRC_PASS(in_pixel, in_crc) \
     (in_crc) = g_crc_table[((in_crc) ^ (in_pixel)) & 0xff] ^ ((in_crc) >> 8)
-#define CRC_END(in_crc) (in_crc) = ((in_crc) ^ g_crc_seed)
+#define CRC_END(in_crc) (in_crc) = ((in_crc) ^ 0xFFFFFFFF)
 
 /*****************************************************************************/
 struct xrdp_bitmap *APP_CC
@@ -716,11 +729,17 @@ xrdp_bitmap_copy_box(struct xrdp_bitmap *self,
                      struct xrdp_bitmap *dest,
                      int x, int y, int cx, int cy)
 {
-    int i = 0;
-    int j = 0;
-    int destx = 0;
-    int desty = 0;
-    int pixel = 0;
+    int i;
+    int destx;
+    int desty;
+    int incs;
+    int incd;
+    tui8 *s8;
+    tui8 *d8;
+    tui16 *s16;
+    tui16 *d16;
+    tui32 *s32;
+    tui32 *d32;
 
     if (self == 0)
     {
@@ -762,35 +781,54 @@ xrdp_bitmap_copy_box(struct xrdp_bitmap *self,
 
     if (self->bpp == 24)
     {
+        s32 = ((tui32 *)(self->data)) + (self->width * y + x);
+        d32 = ((tui32 *)(dest->data)) + (dest->width * desty + destx);
+        incs = self->width - cx;
+        incd = dest->width - cx;
+
         for (i = 0; i < cy; i++)
         {
-            for (j = 0; j < cx; j++)
-            {
-                pixel = GETPIXEL32(self->data, j + x, i + y, self->width);
-                SETPIXEL32(dest->data, j + destx, i + desty, dest->width, pixel);
-            }
+            g_memcpy(d32, s32, cx * 4);
+            s32 += cx;
+            d32 += cx;
+
+            s32 += incs;
+            d32 += incd;
         }
+
     }
     else if (self->bpp == 15 || self->bpp == 16)
     {
+        s16 = ((tui16 *)(self->data)) + (self->width * y + x);
+        d16 = ((tui16 *)(dest->data)) + (dest->width * desty + destx);
+        incs = self->width - cx;
+        incd = dest->width - cx;
+
         for (i = 0; i < cy; i++)
         {
-            for (j = 0; j < cx; j++)
-            {
-                pixel = GETPIXEL16(self->data, j + x, i + y, self->width);
-                SETPIXEL16(dest->data, j + destx, i + desty, dest->width, pixel);
-            }
+            g_memcpy(d16, s16, cx * 2);
+            s16 += cx;
+            d16 += cx;
+
+            s16 += incs;
+            d16 += incd;
         }
     }
     else if (self->bpp == 8)
     {
+        s8 = ((tui8 *)(self->data)) + (self->width * y + x);
+        d8 = ((tui8 *)(dest->data)) + (dest->width * desty + destx);
+        incs = self->width - cx;
+        incd = dest->width - cx;
+
         for (i = 0; i < cy; i++)
         {
-            for (j = 0; j < cx; j++)
-            {
-                pixel = GETPIXEL8(self->data, j + x, i + y, self->width);
-                SETPIXEL8(dest->data, j + destx, i + desty, dest->width, pixel);
-            }
+            g_memcpy(d8, s8, cx);
+            s8 += cx;
+            d8 += cx;
+
+            s8 += incs;
+            d8 += incd;
         }
     }
     else
@@ -802,6 +840,51 @@ xrdp_bitmap_copy_box(struct xrdp_bitmap *self,
 }
 
 /*****************************************************************************/
+int APP_CC
+xrdp_bitmap_hash_crc(struct xrdp_bitmap *self)
+{
+    void *hash;
+    int bytes;
+    int crc;
+    int index;
+    char hash_data[16];
+
+    if (self->bpp == 24)
+    {
+        bytes = self->width * self->height * 4;
+    }
+    else if (self->bpp == 15 || self->bpp == 16)
+    {
+        bytes = self->width * self->height * 2;
+    }
+    else if (self->bpp == 8)
+    {
+        bytes = self->width * self->height;
+    }
+    else
+    {
+        return 1;
+    }
+    hash = ssl_md5_info_create();
+    ssl_md5_transform(hash, self->data, bytes);
+    ssl_md5_complete(hash, hash_data);
+    ssl_md5_info_delete(hash);
+    CRC_START(crc);
+    CRC_PASS(self->width, crc);
+    CRC_PASS(self->width >> 8, crc);
+    CRC_PASS(self->height, crc);
+    CRC_PASS(self->height >> 8, crc);
+    for (index = 0; index < 16; index++)
+    {
+        CRC_PASS(hash_data[index], crc);
+    }
+    CRC_END(crc);
+    self->crc32 = crc;
+    self->crc16 = self->crc32 & 0xffff;
+    return 0;
+}
+
+/*****************************************************************************/
 /* copy part of self at x, y to 0, 0 in dest */
 /* returns error */
 int APP_CC
@@ -809,20 +892,20 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
                               struct xrdp_bitmap *dest,
                               int x, int y, int cx, int cy)
 {
-    int i = 0;
-    int j = 0;
-    int destx = 0;
-    int desty = 0;
-    int pixel = 0;
-    int crc = 0;
-    int incs = 0;
-    int incd = 0;
-    unsigned char *s8 = (unsigned char *)NULL;
-    unsigned char *d8 = (unsigned char *)NULL;
-    unsigned short *s16 = (unsigned short *)NULL;
-    unsigned short *d16 = (unsigned short *)NULL;
-    unsigned int *s32;
-    unsigned int *d32;
+    int i;
+    int j;
+    int destx;
+    int desty;
+    int pixel;
+    int crc;
+    int incs;
+    int incd;
+    tui8 *s8;
+    tui8 *d8;
+    tui16 *s16;
+    tui16 *d16;
+    tui32 *s32;
+    tui32 *d32;
 
     if (self == 0)
     {
@@ -864,47 +947,54 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
 
     CRC_START(crc);
 
+    CRC_PASS(self->width, crc);
+    CRC_PASS(self->width >> 8, crc);
+
+    CRC_PASS(self->height, crc);
+    CRC_PASS(self->height >> 8, crc);
+
     if (self->bpp == 24)
     {
-        s32 = ((unsigned int *)(self->data)) + (self->width * y + x);
-        d32 = ((unsigned int *)(dest->data)) + (dest->width * desty + destx);
+        s32 = ((tui32 *)(self->data)) + (self->width * y + x);
+        d32 = ((tui32 *)(dest->data)) + (dest->width * desty + destx);
         incs = self->width - cx;
         incd = dest->width - cx;
 
         for (i = 0; i < cy; i++)
         {
             j = 0;
+
             while (j < cx - 4)
             {
                 pixel = *s32;
+                *d32 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
                 CRC_PASS(pixel >> 16, crc);
-                *d32 = pixel;
                 s32++;
                 d32++;
 
                 pixel = *s32;
+                *d32 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
                 CRC_PASS(pixel >> 16, crc);
-                *d32 = pixel;
                 s32++;
                 d32++;
 
                 pixel = *s32;
+                *d32 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
                 CRC_PASS(pixel >> 16, crc);
-                *d32 = pixel;
                 s32++;
                 d32++;
 
                 pixel = *s32;
+                *d32 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
                 CRC_PASS(pixel >> 16, crc);
-                *d32 = pixel;
                 s32++;
                 d32++;
 
@@ -913,10 +1003,10 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
             while (j < cx)
             {
                 pixel = *s32;
+                *d32 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
                 CRC_PASS(pixel >> 16, crc);
-                *d32 = pixel;
                 s32++;
                 d32++;
 
@@ -929,8 +1019,8 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
     }
     else if (self->bpp == 15 || self->bpp == 16)
     {
-        s16 = ((unsigned short *)(self->data)) + (self->width * y + x);
-        d16 = ((unsigned short *)(dest->data)) + (dest->width * desty + destx);
+        s16 = ((tui16 *)(self->data)) + (self->width * y + x);
+        d16 = ((tui16 *)(dest->data)) + (dest->width * desty + destx);
         incs = self->width - cx;
         incd = dest->width - cx;
 
@@ -939,9 +1029,9 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
             for (j = 0; j < cx; j++)
             {
                 pixel = *s16;
+                *d16 = pixel;
                 CRC_PASS(pixel, crc);
                 CRC_PASS(pixel >> 8, crc);
-                *d16 = pixel;
                 s16++;
                 d16++;
             }
@@ -952,8 +1042,8 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
     }
     else if (self->bpp == 8)
     {
-        s8 = ((unsigned char *)(self->data)) + (self->width * y + x);
-        d8 = ((unsigned char *)(dest->data)) + (dest->width * desty + destx);
+        s8 = ((tui8 *)(self->data)) + (self->width * y + x);
+        d8 = ((tui8 *)(dest->data)) + (dest->width * desty + destx);
         incs = self->width - cx;
         incd = dest->width - cx;
 
@@ -962,8 +1052,8 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
             for (j = 0; j < cx; j++)
             {
                 pixel = *s8;
-                CRC_PASS(pixel, crc);
                 *d8 = pixel;
+                CRC_PASS(pixel, crc);
                 s8++;
                 d8++;
             }
@@ -978,7 +1068,14 @@ xrdp_bitmap_copy_box_with_crc(struct xrdp_bitmap *self,
     }
 
     CRC_END(crc);
-    dest->crc = crc;
+    dest->crc32 = crc;
+    dest->crc16 = dest->crc32 & 0xffff;
+
+    LLOGLN(10, ("xrdp_bitmap_copy_box_with_crc: crc16 0x%4.4x",
+           dest->crc16));
+    LLOGLN(10, ("xrdp_bitmap_copy_box_with_crc: width %d height %d",
+           dest->width, dest->height));
+
     return 0;
 }
 
@@ -988,45 +1085,8 @@ int APP_CC
 xrdp_bitmap_compare(struct xrdp_bitmap *self,
                     struct xrdp_bitmap *b)
 {
-    if (self == 0)
-    {
-        return 0;
-    }
-
-    if (b == 0)
-    {
-        return 0;
-    }
+    LLOGLN(10, ("xrdp_bitmap_compare:"));
 
-    if (self->bpp != b->bpp)
-    {
-        return 0;
-    }
-
-    if (self->width != b->width)
-    {
-        return 0;
-    }
-
-    if (self->height != b->height)
-    {
-        return 0;
-    }
-
-    if (g_memcmp(self->data, b->data, b->height * b->line_size) == 0)
-    {
-        return 1;
-    }
-
-    return 0;
-}
-
-/*****************************************************************************/
-/* returns true if they are the same, else returns false */
-int APP_CC
-xrdp_bitmap_compare_with_crc(struct xrdp_bitmap *self,
-                             struct xrdp_bitmap *b)
-{
     if (self == 0)
     {
         return 0;
@@ -1052,7 +1112,7 @@ xrdp_bitmap_compare_with_crc(struct xrdp_bitmap *self,
         return 0;
     }
 
-    if (self->crc == b->crc)
+    if (g_memcmp(self->data, b->data, b->height * b->line_size) == 0)
     {
         return 1;
     }
diff --git a/xrdp/xrdp_cache.c b/xrdp/xrdp_cache.c
index 22bbea3c..9c8098f6 100644
--- a/xrdp/xrdp_cache.c
+++ b/xrdp/xrdp_cache.c
@@ -20,6 +20,7 @@
 
 #include "xrdp.h"
 #include "log.h"
+#include "crc16.h"
 
 #define LLOG_LEVEL 1
 #define LLOGLN(_level, _args) \
@@ -34,6 +35,59 @@
   while (0)
 
 /*****************************************************************************/
+static int APP_CC
+xrdp_cache_reset_lru(struct xrdp_cache *self)
+{
+    int index;
+    int jndex;
+    struct xrdp_lru_item *lru;
+
+    for (index = 0; index < XRDP_MAX_BITMAP_CACHE_ID; index++)
+    {
+        /* fist item */
+        lru = &(self->bitmap_lrus[index][0]);
+        lru->next = 1;
+        lru->prev = -1;
+        /* middle items */
+        for (jndex = 1; jndex < XRDP_MAX_BITMAP_CACHE_IDX - 1; jndex++)
+        {
+            lru = &(self->bitmap_lrus[index][jndex]);
+            lru->next = jndex + 1;
+            lru->prev = jndex - 1;
+        }
+        /* last item */
+        lru = &(self->bitmap_lrus[index][XRDP_MAX_BITMAP_CACHE_IDX - 1]);
+        lru->next = -1;
+        lru->prev = XRDP_MAX_BITMAP_CACHE_IDX - 2;
+
+        self->lru_head[index] = 0;
+        self->lru_tail[index] = XRDP_MAX_BITMAP_CACHE_IDX - 1;
+
+        self->lru_reset[index] = 1;
+    }
+    return 0;
+}
+
+/*****************************************************************************/
+static int APP_CC
+xrdp_cache_reset_crc(struct xrdp_cache *self)
+{
+    int index;
+    int jndex;
+
+    for (index = 0; index < XRDP_MAX_BITMAP_CACHE_ID; index++)
+    {
+        for (jndex = 0; jndex < 64 * 1024; jndex++)
+        {
+            /* it's ok it deinit a zero'ed out struct list16 */
+            list16_deinit(&(self->crc16[index][jndex]));
+            list16_init(&(self->crc16[index][jndex]));
+        }
+    }
+    return 0;
+}
+
+/*****************************************************************************/
 struct xrdp_cache *APP_CC
 xrdp_cache_create(struct xrdp_wm *owner,
                   struct xrdp_session *session,
@@ -65,6 +119,8 @@ xrdp_cache_create(struct xrdp_wm *owner,
     self->bitmap_cache_version = client_info->bitmap_cache_version;
     self->pointer_cache_entries = client_info->pointer_cache_entries;
     self->xrdp_os_del_list = list_create();
+    xrdp_cache_reset_lru(self);
+    xrdp_cache_reset_crc(self);
     LLOGLN(10, ("xrdp_cache_create: 0 %d 1 %d 2 %d",
                 self->cache1_entries, self->cache2_entries, self->cache3_entries));
     return self;
@@ -108,6 +164,15 @@ xrdp_cache_delete(struct xrdp_cache *self)
 
     list_delete(self->xrdp_os_del_list);
 
+    /* free all crc lists */
+    for (i = 0; i < XRDP_MAX_BITMAP_CACHE_ID; i++)
+    {
+        for (j = 0; j < 64 * 1024; j++)
+        {
+            list16_deinit(&(self->crc16[i][j]));
+        }
+    }
+
     g_free(self);
 }
 
@@ -157,157 +222,228 @@ xrdp_cache_reset(struct xrdp_cache *self,
     self->bitmap_cache_persist_enable = client_info->bitmap_cache_persist_enable;
     self->bitmap_cache_version = client_info->bitmap_cache_version;
     self->pointer_cache_entries = client_info->pointer_cache_entries;
+    xrdp_cache_reset_lru(self);
+    xrdp_cache_reset_crc(self);
     return 0;
 }
 
-#define COMPARE_WITH_CRC(_b1, _b2) \
- ((_b1 != 0) && (_b2 != 0) && (_b1->crc == _b2->crc) && \
+#define COMPARE_WITH_CRC32(_b1, _b2) \
+ ((_b1 != 0) && (_b2 != 0) && (_b1->crc32 == _b2->crc32) && \
   (_b1->bpp == _b2->bpp) && \
   (_b1->width == _b2->width) && (_b1->height == _b2->height))
 
 /*****************************************************************************/
-/* returns cache id */
-int APP_CC
-xrdp_cache_add_bitmap(struct xrdp_cache *self, struct xrdp_bitmap *bitmap,
-                      int hints)
+static int APP_CC
+xrdp_cache_update_lru(struct xrdp_cache *self, int cache_id, int lru_index)
 {
-    int i = 0;
-    int j = 0;
-    int oldest = 0;
-    int cache_id = 0;
-    int cache_idx = 0;
-    int bmp_size = 0;
-    int e = 0;
-    int Bpp = 0;
+    int tail_index;
+    struct xrdp_lru_item *nextlru;
+    struct xrdp_lru_item *prevlru;
+    struct xrdp_lru_item *thislru;
+    struct xrdp_lru_item *taillru;
+
+    LLOGLN(10, ("xrdp_cache_update_lru: lru_index %d", lru_index));
+    if ((lru_index < 0) || (lru_index >= XRDP_MAX_BITMAP_CACHE_IDX))
+    {
+        LLOGLN(0, ("xrdp_cache_update_lru: error"));
+        return 1;
+    }
+    if (self->lru_tail[cache_id] == lru_index)
+    {
+        /* nothing to do */
+        return 0;
+    }
+    else if (self->lru_head[cache_id] == lru_index)
+    {
+        /* moving head item to tail */
 
-    e = bitmap->width % 4;
+        thislru = &(self->bitmap_lrus[cache_id][lru_index]);
+        nextlru = &(self->bitmap_lrus[cache_id][thislru->next]);
+        tail_index = self->lru_tail[cache_id];
+        taillru = &(self->bitmap_lrus[cache_id][tail_index]);
 
-    if (e != 0)
+        /* unhook old */
+        nextlru->prev = -1;
+
+        /* set head to next */
+        self->lru_head[cache_id] = thislru->next;
+
+        /* move to tail and hook up */
+        taillru->next = lru_index;
+        thislru->prev = tail_index;
+        thislru->next = -1;
+
+        /* update tail */
+        self->lru_tail[cache_id] = lru_index;
+
+    }
+    else
     {
-        e = 4 - e;
+        /* move middle item */
+
+        thislru = &(self->bitmap_lrus[cache_id][lru_index]);
+        prevlru = &(self->bitmap_lrus[cache_id][thislru->prev]);
+        nextlru = &(self->bitmap_lrus[cache_id][thislru->next]);
+        tail_index = self->lru_tail[cache_id];
+        taillru = &(self->bitmap_lrus[cache_id][tail_index]);
+
+        /* unhook old */
+        prevlru->next = thislru->next;
+        nextlru->prev = thislru->prev;
+
+        /* move to tail and hook up */
+        taillru->next = lru_index;
+        thislru->prev = tail_index;
+        thislru->next = -1;
+
+        /* update tail */
+        self->lru_tail[cache_id] = lru_index;
     }
+    return 0;
+}
+
+/*****************************************************************************/
+/* returns cache id */
+int APP_CC
+xrdp_cache_add_bitmap(struct xrdp_cache *self, struct xrdp_bitmap *bitmap,
+                      int hints)
+{
+    int index;
+    int jndex;
+    int cache_id;
+    int cache_idx;
+    int bmp_size;
+    int e;
+    int Bpp;
+    int crc16;
+    int iig;
+    int found;
+    int cache_entries;
+    int lru_index;
+    struct list16 *ll;
+    struct xrdp_bitmap *lbm;
+    struct xrdp_lru_item *llru;
+
+    LLOGLN(10, ("xrdp_cache_add_bitmap:"));
+    LLOGLN(10, ("xrdp_cache_add_bitmap: crc16 0x%4.4x",
+           bitmap->crc16));
+
+    e = (4 - (bitmap->width % 4)) & 3;
+    found = 0;
+    cache_id = 0;
+    cache_entries = 0;
 
+    /* client Bpp, bmp_size */
     Bpp = (bitmap->bpp + 7) / 8;
     bmp_size = (bitmap->width + e) * bitmap->height * Bpp;
     self->bitmap_stamp++;
 
-    /* look for match */
     if (bmp_size <= self->cache1_size)
     {
-        i = 0;
-
-        for (j = 0; j < self->cache1_entries; j++)
-        {
-#ifdef USE_CRC
-            if (COMPARE_WITH_CRC(self->bitmap_items[i][j].bitmap, bitmap))
-#else
-            if (xrdp_bitmap_compare(self->bitmap_items[i][j].bitmap, bitmap))
-#endif
-            {
-                self->bitmap_items[i][j].stamp = self->bitmap_stamp;
-                LLOGLN(10, ("found bitmap at %d %d", i, j));
-                xrdp_bitmap_delete(bitmap);
-                return MAKELONG(j, i);
-            }
-        }
+        cache_id = 0;
+        cache_entries = self->cache1_entries;
     }
     else if (bmp_size <= self->cache2_size)
     {
-        i = 1;
-
-        for (j = 0; j < self->cache2_entries; j++)
-        {
-#ifdef USE_CRC
-            if (COMPARE_WITH_CRC(self->bitmap_items[i][j].bitmap, bitmap))
-#else
-            if (xrdp_bitmap_compare(self->bitmap_items[i][j].bitmap, bitmap))
-#endif
-            {
-                self->bitmap_items[i][j].stamp = self->bitmap_stamp;
-                LLOGLN(10, ("found bitmap at %d %d", i, j));
-                xrdp_bitmap_delete(bitmap);
-                return MAKELONG(j, i);
-            }
-        }
+        cache_id = 1;
+        cache_entries = self->cache2_entries;
     }
     else if (bmp_size <= self->cache3_size)
     {
-        i = 2;
-
-        for (j = 0; j < self->cache3_entries; j++)
-        {
-#ifdef USE_CRC
-            if (COMPARE_WITH_CRC(self->bitmap_items[i][j].bitmap, bitmap))
-#else
-            if (xrdp_bitmap_compare(self->bitmap_items[i][j].bitmap, bitmap))
-#endif
-            {
-                self->bitmap_items[i][j].stamp = self->bitmap_stamp;
-                LLOGLN(10, ("found bitmap at %d %d", i, j));
-                xrdp_bitmap_delete(bitmap);
-                return MAKELONG(j, i);
-            }
-        }
+        cache_id = 2;
+        cache_entries = self->cache3_entries;
     }
     else
     {
-        log_message(LOG_LEVEL_ERROR,"error in xrdp_cache_add_bitmap, too big(%d) bpp %d", bmp_size, bitmap->bpp);
+        log_message(LOG_LEVEL_ERROR, "error in xrdp_cache_add_bitmap, "
+                    "too big(%d) bpp %d", bmp_size, bitmap->bpp);
+        return 0;
     }
 
-    /* look for oldest */
-    cache_id = 0;
-    cache_idx = 0;
-    oldest = 0x7fffffff;
-
-    if (bmp_size <= self->cache1_size)
+    crc16 = bitmap->crc16;
+    ll = &(self->crc16[cache_id][crc16]);
+    for (jndex = 0; jndex < ll->count; jndex++)
     {
-        i = 0;
-
-        for (j = 0; j < self->cache1_entries; j++)
+        cache_idx = list16_get_item(ll, jndex);
+        if (COMPARE_WITH_CRC32
+                 (self->bitmap_items[cache_id][cache_idx].bitmap, bitmap))
         {
-            if (self->bitmap_items[i][j].stamp < oldest)
-            {
-                oldest = self->bitmap_items[i][j].stamp;
-                cache_id = i;
-                cache_idx = j;
-            }
+            LLOGLN(10, ("found bitmap at %d %d", index, jndex));
+            found = 1;
+            break;
         }
     }
-    else if (bmp_size <= self->cache2_size)
+    if (found)
     {
-        i = 1;
+        lru_index = self->bitmap_items[cache_id][cache_idx].lru_index;
+        self->bitmap_items[cache_id][cache_idx].stamp = self->bitmap_stamp;
+        xrdp_bitmap_delete(bitmap);
 
-        for (j = 0; j < self->cache2_entries; j++)
-        {
-            if (self->bitmap_items[i][j].stamp < oldest)
-            {
-                oldest = self->bitmap_items[i][j].stamp;
-                cache_id = i;
-                cache_idx = j;
-            }
-        }
+        /* update lru to end */
+        xrdp_cache_update_lru(self, cache_id, lru_index);
+
+        return MAKELONG(cache_idx, cache_id);
     }
-    else if (bmp_size <= self->cache3_size)
+
+    /* find lru */
+
+    /* check for reset */
+    if (self->lru_reset[cache_id])
     {
-        i = 2;
+        self->lru_reset[cache_id] = 0;
+        LLOGLN(0, ("xrdp_cache_add_bitmap: reset detected cache_id %d",
+               cache_id));
+        self->lru_tail[cache_id] = cache_entries - 1;
+        index = self->lru_tail[cache_id];
+        llru = &(self->bitmap_lrus[cache_id][index]);
+        llru->next = -1;
+    }
+
+    /* lru is item at head */
+    lru_index = self->lru_head[cache_id];
+    cache_idx = lru_index;
+
+    /* update lru to end */
+    xrdp_cache_update_lru(self, cache_id, lru_index);
+
+    LLOGLN(10, ("xrdp_cache_add_bitmap: oldest %d %d", cache_id, cache_idx));
+
+    LLOGLN(10, ("adding bitmap at %d %d old ptr %p new ptr %p",
+           cache_id, cache_idx,
+           self->bitmap_items[cache_id][cache_idx].bitmap,
+           bitmap));
 
-        for (j = 0; j < self->cache3_entries; j++)
+    /* remove old, about to be deleted, from crc16 list */
+    lbm = self->bitmap_items[cache_id][cache_idx].bitmap;
+    if (lbm != 0)
+    {
+        crc16 = lbm->crc16;
+        ll = &(self->crc16[cache_id][crc16]);
+        iig = list16_index_of(ll, cache_idx);
+        if (iig == -1)
         {
-            if (self->bitmap_items[i][j].stamp < oldest)
-            {
-                oldest = self->bitmap_items[i][j].stamp;
-                cache_id = i;
-                cache_idx = j;
-            }
+            LLOGLN(0, ("xrdp_cache_add_bitmap: error removing cache_idx"));
         }
+        LLOGLN(10, ("xrdp_cache_add_bitmap: removing index %d from crc16 %d",
+               iig, crc16));
+        list16_remove_item(ll, iig);
+        xrdp_bitmap_delete(lbm);
     }
 
-    LLOGLN(10, ("adding bitmap at %d %d ptr %p", cache_id, cache_idx,
-                self->bitmap_items[cache_id][cache_idx].bitmap));
     /* set, send bitmap and return */
-    xrdp_bitmap_delete(self->bitmap_items[cache_id][cache_idx].bitmap);
+
     self->bitmap_items[cache_id][cache_idx].bitmap = bitmap;
     self->bitmap_items[cache_id][cache_idx].stamp = self->bitmap_stamp;
+    self->bitmap_items[cache_id][cache_idx].lru_index = lru_index;
+
+    /* add to crc16 list */
+    crc16 = bitmap->crc16;
+    ll = &(self->crc16[cache_id][crc16]);
+    list16_add_item(ll, cache_idx);
+    if (ll->count > 1)
+    {
+        LLOGLN(10, ("xrdp_cache_add_bitmap: count %d", ll->count));
+    }
 
     if (self->use_bitmap_comp)
     {
diff --git a/xrdp/xrdp_painter.c b/xrdp/xrdp_painter.c
index fd583ff2..88d69b1d 100644
--- a/xrdp/xrdp_painter.c
+++ b/xrdp/xrdp_painter.c
@@ -850,7 +850,12 @@ xrdp_painter_copy(struct xrdp_painter *self,
                 w = MIN(64, ((srcx + cx) - i));
                 h = MIN(64, ((srcy + cy) - j));
                 b = xrdp_bitmap_create(w, h, src->bpp, 0, self->wm);
+#if 1
                 xrdp_bitmap_copy_box_with_crc(src, b, i, j, w, h);
+#else
+                xrdp_bitmap_copy_box(src, b, i, j, w, h);
+                xrdp_bitmap_hash_crc(b);
+#endif
                 bitmap_id = xrdp_cache_add_bitmap(self->wm->cache, b, self->wm->hints);
                 cache_id = HIWORD(bitmap_id);
                 cache_idx = LOWORD(bitmap_id);
diff --git a/xrdp/xrdp_types.h b/xrdp/xrdp_types.h
index b824f176..00cf435f 100644
--- a/xrdp/xrdp_types.h
+++ b/xrdp/xrdp_types.h
@@ -178,9 +178,16 @@ struct xrdp_palette_item
 struct xrdp_bitmap_item
 {
   int stamp;
+  int lru_index;
   struct xrdp_bitmap* bitmap;
 };
 
+struct xrdp_lru_item
+{
+  int next;
+  int prev;
+};
+
 struct xrdp_os_bitmap_item
 {
   int id;
@@ -226,6 +233,17 @@ struct xrdp_cache
   int bitmap_stamp;
   struct xrdp_bitmap_item bitmap_items[XRDP_MAX_BITMAP_CACHE_ID]
                                       [XRDP_MAX_BITMAP_CACHE_IDX];
+
+  /* lru optimize */
+  struct xrdp_lru_item bitmap_lrus[XRDP_MAX_BITMAP_CACHE_ID]
+                                  [XRDP_MAX_BITMAP_CACHE_IDX];
+  int lru_head[XRDP_MAX_BITMAP_CACHE_ID];
+  int lru_tail[XRDP_MAX_BITMAP_CACHE_ID];
+  int lru_reset[XRDP_MAX_BITMAP_CACHE_ID];
+
+  /* crc optimize */
+  struct list16 crc16[XRDP_MAX_BITMAP_CACHE_ID][64 * 1024];
+
   int use_bitmap_comp;
   int cache1_entries;
   int cache1_size;
@@ -461,7 +479,8 @@ struct xrdp_bitmap
   struct xrdp_bitmap* popped_from;
   int item_height;
   /* crc */
-  int crc;
+  int crc32;
+  int crc16;
 };
 
 #define NUM_FONTS 0x4e00