From e70e45a9d044142a71d84e00a7ab729da79a7a35 Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Tue, 8 Oct 2013 09:57:57 +0200
Subject: [PATCH] cache glyphs

---
 screen.c    | 89 +++++++++++++++++++++++++++++++----------------------
 spiceterm.c |  2 ++
 spiceterm.h |  8 +++++
 3 files changed, 62 insertions(+), 37 deletions(-)

diff --git a/screen.c b/screen.c
index 76775fd..fdbc221 100644
--- a/screen.c
+++ b/screen.c
@@ -70,10 +70,11 @@ int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 /* Parts cribbed from spice-display.h/.c/qxl.c */
 
 typedef struct SimpleSpiceUpdate {
-    QXLCommandExt ext; // first
+    QXLCommandExt ext; // needs to be first member
     QXLDrawable drawable;
     QXLImage image;
     uint8_t *bitmap;
+    int cache_id; // do not free bitmap if cache_id != 0
 } SimpleSpiceUpdate;
 
 static void 
@@ -86,7 +87,10 @@ spice_screen_destroy_update(SimpleSpiceUpdate *update)
         uint8_t *ptr = (uint8_t*)update->drawable.clip.data;
         free(ptr);
     }
-    g_free(update->bitmap);
+    if (update->bitmap && !update->cache_id) {
+        g_free(update->bitmap);
+    }
+
     g_free(update);
 }
 
@@ -166,6 +170,7 @@ spice_screen_update_from_bitmap_cmd(uint32_t surface_id, QXLRect bbox, uint8_t *
     if (cache_id) {
         QXL_SET_IMAGE_ID(image, QXL_IMAGE_GROUP_DEVICE, cache_id);
         image->descriptor.flags = SPICE_IMAGE_FLAGS_CACHE_ME;
+        update->cache_id = cache_id;
     } else {
         QXL_SET_IMAGE_ID(image, QXL_IMAGE_GROUP_DEVICE, ++unique);
     }
@@ -189,14 +194,18 @@ spice_screen_draw_char_cmd(SpiceScreen *spice_screen, int x, int y, int c,
 {
     int top, left;
     uint8_t *dst;
-    uint8_t *bitmap;
+    uint8_t *bitmap = NULL;
     int bw, bh;
     int i, j;
     QXLRect bbox;
     int cache_id = 0;
+    CachedImage *ce;
 
     if (!uline && c < 256) {
         cache_id = ((fg << 12) | (bg << 8) | (c & 255)) & 0x0ffff;
+        if ((ce = (CachedImage *)g_hash_table_lookup(spice_screen->image_cache, &cache_id))) {
+            bitmap = ce->bitmap;
+        }
     }
 
     left = x*8;
@@ -205,42 +214,48 @@ spice_screen_draw_char_cmd(SpiceScreen *spice_screen, int x, int y, int c,
     bw       = 8;
     bh       = 16;
 
-    bitmap = dst = g_malloc(bw * bh * 4);
-
-    unsigned char *data = vt_font_data + c*16;
-    unsigned char d = *data;
-
-    g_assert(fg >= 0 && fg < 16);
-    g_assert(bg >= 0 && bg < 16);
-
-    unsigned char fgc_red = default_red[fg];
-    unsigned char fgc_blue = default_blu[fg];
-    unsigned char fgc_green = default_grn[fg];
-    unsigned char bgc_red = default_red[bg];
-    unsigned char bgc_blue = default_blu[bg];
-    unsigned char bgc_green = default_grn[bg];
-
-    for (j = 0; j < 16; j++) {
-        gboolean ul = (j == 14) && uline;
-        for (i = 0; i < 8; i++) {
-            if (i == 0) {
-                d=*data;
-                data++;
-            }
-            if (ul || d&0x80) {
-                 *(dst) = fgc_blue;
-                 *(dst+1) = fgc_green;
-                 *(dst+2) = fgc_red;
-                 *(dst+3) = 0;
-            } else {
-                 *(dst) = bgc_blue;
-                 *(dst+1) = bgc_green;
-                 *(dst+2) = bgc_red;
-                 *(dst+3) = 0;
+    if (!bitmap) {
+        bitmap = dst = g_malloc(bw * bh * 4);
+        
+        unsigned char *data = vt_font_data + c*16;
+        unsigned char d = *data;
+
+        g_assert(fg >= 0 && fg < 16);
+        g_assert(bg >= 0 && bg < 16);
+
+        unsigned char fgc_red = default_red[fg];
+        unsigned char fgc_blue = default_blu[fg];
+        unsigned char fgc_green = default_grn[fg];
+        unsigned char bgc_red = default_red[bg];
+        unsigned char bgc_blue = default_blu[bg];
+        unsigned char bgc_green = default_grn[bg];
+
+        for (j = 0; j < 16; j++) {
+            gboolean ul = (j == 14) && uline;
+            for (i = 0; i < 8; i++) {
+                if (i == 0) {
+                    d=*data;
+                    data++;
+                }
+                if (ul || d&0x80) {
+                    *(dst) = fgc_blue;
+                    *(dst+1) = fgc_green;
+                    *(dst+2) = fgc_red;
+                    *(dst+3) = 0;
+                } else {
+                    *(dst) = bgc_blue;
+                    *(dst+1) = bgc_green;
+                    *(dst+2) = bgc_red;
+                    *(dst+3) = 0;
+                }
+                d<<=1;
+                dst += 4;
             }
-            d<<=1;
-            dst += 4;
         }
+        ce = g_new(CachedImage, 1);
+        ce->cache_id = cache_id;
+        ce->bitmap = bitmap;
+        g_hash_table_insert(spice_screen->image_cache, &ce->cache_id, ce);
     }
 
     bbox.left = left; bbox.top = top;
diff --git a/spiceterm.c b/spiceterm.c
index 2f54e8b..680a5c7 100644
--- a/spiceterm.c
+++ b/spiceterm.c
@@ -2055,6 +2055,8 @@ create_spiceterm(int argc, char** argv, uint32_t maxx, uint32_t maxy, guint time
     SpiceScreen *spice_screen = spice_screen_new(core, maxx, maxy, timeout);
 
     //spice_server_set_image_compression(server, SPICE_IMAGE_COMPRESS_OFF);
+    
+    spice_screen->image_cache = g_hash_table_new(g_int_hash, g_int_equal);
 
     spiceTerm *vt = (spiceTerm *)calloc (sizeof(spiceTerm), 1);
 
diff --git a/spiceterm.h b/spiceterm.h
index c3fa403..729ae3d 100644
--- a/spiceterm.h
+++ b/spiceterm.h
@@ -26,6 +26,11 @@ typedef struct TextCell {
 
 typedef struct SpiceScreen SpiceScreen;
 
+typedef struct CachedImage {
+    uint8_t *bitmap;
+    int cache_id;
+} CachedImage;
+
 struct SpiceScreen {
     SpiceCoreInterface *core;
     SpiceServer *server;
@@ -53,6 +58,9 @@ struct SpiceScreen {
     int commands_start;
     struct QXLCommandExt* commands[COMMANDS_SIZE];
 
+    //cache for glyphs bitmaps
+    GHashTable *image_cache;
+
     // callbacks
     void (*on_client_connected)(SpiceScreen *spice_screen);
     void (*on_client_disconnected)(SpiceScreen *spice_screen);
-- 
2.39.2