diff --git a/examples/aafire.c b/examples/aafire.c
index 20fd639..077c6b4 100644
--- a/examples/aafire.c
+++ b/examples/aafire.c
@@ -95,7 +95,7 @@ initialize (void)
 {
   int i;
 #ifdef LIBCACA
-  int r[256], g[256], b[256];
+  int r[256], g[256], b[256], a[256];
 #endif
 
 #ifdef LIBCACA
@@ -104,6 +104,7 @@ initialize (void)
       printf ("Failed to initialize libcaca\n");
       exit (1);
     }
+  caca_set_delay(20000);
 #else
   context = aa_autoinit (&aa_defparams);
   if (context == NULL)
@@ -121,6 +122,7 @@ initialize (void)
     r[i] = pal[i * 3] * 64;
     g[i] = pal[i * 3 + 1] * 64;
     b[i] = pal[i * 3 + 2] * 64;
+    a[i] = 0xfff;
   }
 #else
     aa_setpalette (palette, i, pal[i * 3] * 4,
@@ -128,14 +130,13 @@ initialize (void)
 #endif
 
 #ifdef LIBCACA
-  caca_bitmap = caca_create_bitmap(8, XSIZ, YSIZ - 4, XSIZ, 0, 0, 0);
-  caca_set_bitmap_palette(caca_bitmap, r, g, b);
+  caca_bitmap = caca_create_bitmap(8, XSIZ, YSIZ - 2, XSIZ, 0, 0, 0, 0);
+  caca_set_bitmap_palette(caca_bitmap, r, g, b, a);
   bitmap = malloc(XSIZ * YSIZ * sizeof(char));
   caca_set_dithering(CACA_DITHERING_ORDERED8);
 #else
   aa_hidecursor (context);
 #endif
-fprintf(stderr, "%i %i\n", XSIZ, YSIZ);
 }
 static void
 uninitialize (void)
diff --git a/examples/demo.c b/examples/demo.c
index a4d5860..69b840a 100644
--- a/examples/demo.c
+++ b/examples/demo.c
@@ -40,6 +40,7 @@ static void demo_boxes(void);
 static void demo_ellipses(void);
 static void demo_triangles(void);
 static void demo_sprites(void);
+static void demo_render(void);
 
 int bounds = 0;
 int outline = 0;
@@ -130,6 +131,9 @@ int main(int argc, char **argv)
             case 'S':
                 if(sprite)
                     demo = demo_sprites;
+            case 'r':
+            case 'R':
+                demo = demo_render;
                 break;
             }
 
@@ -193,8 +197,9 @@ static void display_menu(void)
     caca_putstr(4, 11, "'4': triangles");
     caca_putstr(4, 12, "'5': ellipses");
     caca_putstr(4, 13, "'c': colour");
+    caca_putstr(4, 14, "'r': render");
     if(sprite)
-        caca_putstr(4, 14, "'s': sprites");
+        caca_putstr(4, 15, "'s': sprites");
 
     caca_putstr(4, 16, "settings:");
     caca_printf(4, 17, "'o': outline: %s",
@@ -460,3 +465,103 @@ static void demo_sprites(void)
                    caca_rand(0, caca_get_height() - 1), sprite, 0);
 }
 
+#if 0
+static void demo_render(void)
+{
+    struct caca_bitmap *bitmap;
+    //short buffer[256*256];
+    //short *dest = buffer;
+    int buffer[256*256];
+    int *dest = buffer;
+    int x, y, z;
+    static int i = 0;
+
+    i = (i + 1) % 512;
+    z = i < 256 ? i : 511 - i;
+
+    for(x = 0; x < 256; x++)
+        for(y = 0; y < 256; y++)
+    {
+        //*dest++ = ((x >> 3) << 11) | ((y >> 2) << 5) | ((z >> 3));
+        *dest++ = (x << 16) | (y << 8) | (z);
+    }
+
+    //bitmap = caca_create_bitmap(16, 256, 256, 2 * 256, 0xf800, 0x07e0, 0x001f, 0x0000);
+    bitmap = caca_create_bitmap(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
+    caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1,
+                     bitmap, buffer);
+    caca_free_bitmap(bitmap);
+}
+#endif
+
+static void draw_circle(int *buffer, int xo, int yo, int r, int mask, int val);
+
+static void demo_render(void)
+{
+    struct caca_bitmap *bitmap;
+    int buffer[256*256];
+    int *dest;
+    int x, y, z, t, xo, yo;
+    static int i = 0;
+
+    i++;
+
+    dest = buffer;
+    for(x = 0; x < 256; x++)
+        for(y = 0; y < 256; y++)
+    {
+        *dest++ = 0;
+    }
+
+    /* red */
+    xo = 128 + 48 * sin(0.02 * i);
+    yo = 128 + 48 * cos(0.03 * i);
+    t = 256 * (2.0 + sin(4 + 0.017 * i)) / 3;
+    for(z = 0; z < 240; z++)
+        draw_circle(buffer, xo, yo, z, 0x00ff0000,
+                    ((255 - z) * t / 256) << 16);
+
+    /* green */
+    xo = 128 + 48 * sin(2 + 0.06 * i);
+    yo = 128 + 48 * cos(2 + 0.05 * i);
+    t = 256 * (2.0 + sin(8 + 0.021 * i)) / 3;
+    for(z = 0; z < 240; z++)
+        draw_circle(buffer, xo, yo, z, 0x0000ff00,
+                    ((255 - z) * t / 256) << 8);
+
+    /* blue */
+    xo = 128 + 48 * sin(1 + 0.04 * i);
+    yo = 128 + 48 * cos(1 + 0.03 * i);
+    t = 256 * (2.0 + sin(3 + 0.033 * i)) / 3;
+    for(z = 0; z < 240; z++)
+        draw_circle(buffer, xo, yo, z, 0x000000ff, (255 - z) * t / 256);
+
+    bitmap = caca_create_bitmap(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
+    caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1,
+                     bitmap, (char *)buffer);
+    caca_free_bitmap(bitmap);
+}
+
+static void draw_circle(int *buffer, int x, int y, int r, int mask, int val)
+{
+    int t, dx, dy;
+
+#define POINT(X,Y) \
+    buffer[(X) + 256 * (Y)] = (buffer[(X) + 256 * (Y)] & ~mask) | val;
+
+    for(t = 0, dx = 0, dy = r; dx <= dy; dx++)
+    {
+        POINT(x - dx / 3, y - dy / 3);
+        POINT(x + dx / 3, y - dy / 3);
+        POINT(x - dx / 3, y + dy / 3);
+        POINT(x + dx / 3, y + dy / 3);
+
+        POINT(x - dy / 3, y - dx / 3);
+        POINT(x + dy / 3, y - dx / 3);
+        POINT(x - dy / 3, y + dx / 3);
+        POINT(x + dy / 3, y + dx / 3);
+
+        t += t > 0 ? dx - dy-- : dx;
+    }
+}
+
diff --git a/examples/view.c b/examples/view.c
index 6336d65..5b011a8 100644
--- a/examples/view.c
+++ b/examples/view.c
@@ -32,23 +32,25 @@
 
 #include "caca.h"
 
+/* Local functions */
+static void load_image(const char *);
+static void draw_checkers(unsigned int, unsigned int,
+                          unsigned int, unsigned int);
+
+/* Local variables */
 Imlib_Image image = NULL;
 char *pixels = NULL;
 struct caca_bitmap *bitmap = NULL;
 int x, y, w, h;
-const unsigned int rmask = 0x00ff0000, gmask = 0x0000ff00, bmask = 0x000000ff;
-
-int dithering = CACA_DITHERING_ORDERED4;
-
-static void load_image(const char *);
 
 int main(int argc, char **argv)
 {
-    int quit = 0, update = 1, help = 0, reload = 0;
-    int i, zoom = 0;
+    int quit = 0, update = 1, help = 0, reload = 0, fullscreen = 0, zoom = 0;
+    int dithering = CACA_DITHERING_ORDERED4;
 
     char **list = NULL;
     int current = 0, items = 0, opts = 1;
+    int i;
 
     /* Initialise libcaca */
     if(caca_init())
@@ -101,6 +103,11 @@ int main(int argc, char **argv)
                 if(items) current = (items + current - 1) % items;
                 reload = 1;
                 break;
+            case CACA_EVENT_KEY_PRESS | 'f':
+            case CACA_EVENT_KEY_PRESS | 'F':
+                fullscreen = ~fullscreen;
+                update = 1;
+                break;
             case CACA_EVENT_KEY_PRESS | 'd':
                 dithering = (dithering + 1) % 5;
                 update = 1;
@@ -203,6 +210,7 @@ int main(int argc, char **argv)
             int yo = (wh - 1) / 2;
             int xn = (ww - 1) / (2 - zoom);
             int yn = (wh - 1) / (2 - zoom);
+            draw_checkers(xo - xn, yo - yn, xo + xn, yo + yn);
             caca_draw_bitmap(xo - xn, yo - yn, xo + xn, yo + yn,
                              bitmap, pixels);
         }
@@ -216,27 +224,40 @@ int main(int argc, char **argv)
             if(xn + x > w) x = w - xn;
             if(yn + y > h) y = h - yn;
             newbitmap = caca_create_bitmap(32, 2 * xn, 2 * yn, 4 * w,
-                                           rmask, gmask, bmask);
-            caca_draw_bitmap(0, 0, ww - 1, wh - 1, newbitmap,
+                                           0x00ff0000, 0x0000ff00, 0x000000ff,
+                                           0xff000000);
+            draw_checkers(0, fullscreen ? 0 : 1,
+                          ww - 1, fullscreen ? wh - 1 : wh - 2);
+            caca_draw_bitmap(0, fullscreen ? 0 : 1,
+                             ww - 1, fullscreen ? wh - 1 : wh - 2,
+                             newbitmap,
                              pixels + 4 * (x - xn) + 4 * w * (y - yn));
             caca_free_bitmap(newbitmap);
         }
         else
         {
-            caca_draw_bitmap(0, 0, ww - 1, wh - 1, bitmap, pixels);
+            draw_checkers(0, fullscreen ? 0 : 1,
+                          ww - 1, fullscreen ? wh - 1 : wh - 2);
+            caca_draw_bitmap(0, fullscreen ? 0 : 1,
+                             ww - 1, fullscreen ? wh - 1 : wh - 2,
+                             bitmap, pixels);
         }
 
         caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
-        caca_draw_line(0, 0, ww - 1, 0, ' ');
-        caca_draw_line(0, wh - 1, ww - 1, wh - 1, '-');
-        caca_putstr(0, 0, "q:Quit  n/p:Next/Prev  +/-/x:Zoom  "
-                          "h/j/k/l: Move  d:Dithering");
-        caca_putstr(ww - strlen("?:Help"), 0, "?:Help");
-        caca_printf(3, wh - 1, "cacaview %s", VERSION);
-        caca_printf(ww / 2 - 5, wh - 1, "(%s dithering)",
-                    caca_get_dithering_name(dithering));
-        caca_printf(ww - 14, wh - 1,
-                    "(zoom: %s%i)", zoom > 0 ? "+" : "", zoom);
+
+        if(!fullscreen)
+        {
+            caca_draw_line(0, 0, ww - 1, 0, ' ');
+            caca_draw_line(0, wh - 1, ww - 1, wh - 1, '-');
+            caca_putstr(0, 0, "q:Quit  n/p:Next/Prev  +/-/x:Zoom  "
+                              "h/j/k/l: Move  d:Dithering");
+            caca_putstr(ww - strlen("?:Help"), 0, "?:Help");
+            caca_printf(3, wh - 1, "cacaview %s", VERSION);
+            caca_printf(ww / 2 - 5, wh - 1, "(%s dithering)",
+                        caca_get_dithering_name(dithering));
+            caca_printf(ww - 14, wh - 1,
+                        "(zoom: %s%i)", zoom > 0 ? "+" : "", zoom);
+        }
 
         if(help)
         {
@@ -298,7 +319,8 @@ static void load_image(const char *name)
     y = h / 2;
 
     /* Create the libcaca bitmap */
-    bitmap = caca_create_bitmap(32, w, h, 4 * w, rmask, gmask, bmask);
+    bitmap = caca_create_bitmap(32, w, h, 4 * w, 0x00ff0000, 0x0000ff00,
+                                0x000000ff, 0xff000000);
     if(!bitmap)
     {
         imlib_free_image();
@@ -306,3 +328,19 @@ static void load_image(const char *name)
     }
 }
 
+static void draw_checkers(unsigned int x1, unsigned int y1,
+                          unsigned int x2, unsigned int y2)
+{
+    unsigned int xn, yn;
+
+    for(yn = y1; yn <= y2; yn++)
+        for(xn = x1; xn <= x2; xn++)
+    {
+        if(((xn / 4) ^ (yn / 2)) & 1)
+            caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_DARKGRAY);
+        else
+            caca_set_color(CACA_COLOR_DARKGRAY, CACA_COLOR_LIGHTGRAY);
+        caca_putchar(xn, yn, ' ');
+    }
+}
+
diff --git a/src/bitmap.c b/src/bitmap.c
index 254e486..403130d 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -50,8 +50,9 @@ typedef unsigned int uint32_t;
 
 static void mask2shift(unsigned int, int *, int *);
 
-static void get_rgb_default(struct caca_bitmap *, uint8_t *, int, int,
-                            unsigned int *, unsigned int *, unsigned int *);
+static void get_rgba_default(const struct caca_bitmap *, uint8_t *, int, int,
+                             unsigned int *, unsigned int *, unsigned int *,
+                             unsigned int *);
 static void rgb2hsv_default(int, int, int, int *, int *, int *);
 
 /* Dithering methods */
@@ -127,11 +128,11 @@ struct caca_bitmap
 {
     int bpp, palette;
     int w, h, pitch;
-    int rmask, gmask, bmask;
-    int rright, gright, bright;
-    int rleft, gleft, bleft;
+    int rmask, gmask, bmask, amask;
+    int rright, gright, bright, aright;
+    int rleft, gleft, bleft, aleft;
     void (*get_hsv)(struct caca_bitmap *, char *, int, int);
-    int red[256], green[256], blue[256];
+    int red[256], green[256], blue[256], alpha[256];
 };
 
 static void mask2shift(unsigned int mask, int *right, int *left)
@@ -160,7 +161,8 @@ static void mask2shift(unsigned int mask, int *right, int *left)
 }
 
 struct caca_bitmap *caca_create_bitmap(int bpp, int w, int h, int pitch,
-                                       int rmask, int gmask, int bmask)
+                                       int rmask, int gmask, int bmask,
+                                       int amask)
 {
     struct caca_bitmap *bitmap;
 
@@ -182,13 +184,15 @@ struct caca_bitmap *caca_create_bitmap(int bpp, int w, int h, int pitch,
     bitmap->rmask = rmask;
     bitmap->gmask = gmask;
     bitmap->bmask = bmask;
+    bitmap->amask = amask;
 
     /* Load bitmasks */
-    if(rmask || gmask || bmask)
+    if(rmask || gmask || bmask || amask)
     {
         mask2shift(rmask, &bitmap->rright, &bitmap->rleft);
         mask2shift(gmask, &bitmap->gright, &bitmap->gleft);
         mask2shift(bmask, &bitmap->bright, &bitmap->bleft);
+        mask2shift(amask, &bitmap->aright, &bitmap->aleft);
     }
 
     /* In 8 bpp mode, default to a grayscale palette */
@@ -198,9 +202,10 @@ struct caca_bitmap *caca_create_bitmap(int bpp, int w, int h, int pitch,
         bitmap->palette = 1;
         for(i = 0; i < 256; i++)
         {
-            bitmap->red[i] = i * 0x10;
-            bitmap->green[i] = i * 0x10;
-            bitmap->blue[i] = i * 0x10;
+            bitmap->red[i] = i * 0xfff / 256;
+            bitmap->green[i] = i * 0xfff / 256;
+            bitmap->blue[i] = i * 0xfff / 256;
+            bitmap->alpha[i] = 0xfff;
         }
     }
 
@@ -208,7 +213,8 @@ struct caca_bitmap *caca_create_bitmap(int bpp, int w, int h, int pitch,
 }
 
 void caca_set_bitmap_palette(struct caca_bitmap *bitmap,
-                             int red[], int green[], int blue[])
+                             unsigned int red[], unsigned int green[],
+                             unsigned int blue[], unsigned int alpha[])
 {
     int i;
 
@@ -219,11 +225,13 @@ void caca_set_bitmap_palette(struct caca_bitmap *bitmap,
     {
         if(red[i] >= 0 && red[i] < 0x1000 &&
            green[i] >= 0 && green[i] < 0x1000 &&
-           blue[i] >= 0 && blue[i] < 0x1000)
+           blue[i] >= 0 && blue[i] < 0x1000 &&
+           alpha[i] >= 0 && alpha[i] < 0x1000)
         {
             bitmap->red[i] = red[i];
             bitmap->green[i] = green[i];
             bitmap->blue[i] = blue[i];
+            bitmap->alpha[i] = alpha[i];
         }
     }
 }
@@ -236,9 +244,9 @@ void caca_free_bitmap(struct caca_bitmap *bitmap)
     free(bitmap);
 }
 
-static void get_rgb_default(struct caca_bitmap *bitmap, uint8_t *pixels,
-                            int x, int y, unsigned int *r,
-                            unsigned int *g, unsigned int *b)
+static void get_rgba_default(const struct caca_bitmap *bitmap, uint8_t *pixels,
+                             int x, int y, unsigned int *r, unsigned int *g,
+                             unsigned int *b, unsigned int *a)
 {
     uint32_t bits;
 
@@ -254,8 +262,9 @@ static void get_rgb_default(struct caca_bitmap *bitmap, uint8_t *pixels,
 #ifdef HAVE_ENDIAN_H
             if(__BYTE_ORDER == __BIG_ENDIAN)
 #else
-            static const uint32_t rmask = 0x12345678;
-            if(*(uint8_t *)&rmask == 0x12)
+            /* This is compile-time optimised with at least -O1 or -Os */
+            const uint32_t rmask = 0x12345678;
+            if(*(const uint8_t *)&rmask == 0x12)
 #endif
                 bits = ((uint32_t)pixels[0] << 16) |
                        ((uint32_t)pixels[1] << 8) |
@@ -280,12 +289,14 @@ static void get_rgb_default(struct caca_bitmap *bitmap, uint8_t *pixels,
         *r = bitmap->red[bits];
         *g = bitmap->green[bits];
         *b = bitmap->blue[bits];
+        *a = bitmap->alpha[bits];
     }
     else
     {
         *r = ((bits & bitmap->rmask) >> bitmap->rright) << bitmap->rleft;
         *g = ((bits & bitmap->gmask) >> bitmap->gright) << bitmap->gleft;
         *b = ((bits & bitmap->bmask) >> bitmap->bright) << bitmap->bleft;
+        *a = ((bits & bitmap->amask) >> bitmap->aright) << bitmap->aleft;
     }
 }
 
@@ -320,7 +331,7 @@ static void rgb2hsv_default(int r, int g, int b, int *hue, int *sat, int *val)
 }
 
 void caca_draw_bitmap(int x1, int y1, int x2, int y2,
-                      struct caca_bitmap *bitmap, char *pixels)
+                      const struct caca_bitmap *bitmap, char *pixels)
 {
 #if !NEW_RENDERER
     static const int white_colors[] =
@@ -358,18 +369,18 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
 #   define DENSITY_CHARS 13
     static const char density_chars[] =
         "    "
-        "    "
-        ".`  "
-        ",`.'"
-        "i:-^"
-        "|=+;"
-        "ox/\\"
-        "<>x%"
-        "&$zw"
-        "WXKM"
-        "#8##"
-        "8@8#"
-        "@8@8"
+        ".   "
+        "..  "
+        "...."
+        "::::"
+        ";=;="
+        "tftf"
+        "%$%$"
+        "&KSZ"
+        "WXGM"
+        "@@@@"
+        "8888"
+        "####"
         "????";
 
     int x, y, w, h, pitch;
@@ -391,13 +402,13 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
         int tmp = y2; y2 = y1; y1 = tmp;
     }
 
-    for(y = y1 > 0 ? y1 : 0; y <= y2 && y <= (int)caca_get_height(); y++)
+    for(y = y1 > 0 ? y1 : 0; y <= y2 && y <= (int)_caca_height; y++)
         for(x = x1 > 0 ? x1 : 0, _init_dither(y);
-            x <= x2 && x <= (int)caca_get_width();
+            x <= x2 && x <= (int)_caca_width;
             x++)
     {
         int ch;
-        unsigned int r, g, b, R, G, B;
+        unsigned int r, g, b, a, R, G, B;
         int hue, sat, val;
         int fromx = w * (x - x1) / (x2 - x1 + 1);
         int fromy = h * (y - y1) / (y2 - y1 + 1);
@@ -413,18 +424,20 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
 
         /* First get RGB */
         R = 0, G = 0, B = 0;
-        get_rgb_default(bitmap, pixels, fromx, fromy, &r, &g, &b);
+        get_rgba_default(bitmap, pixels, fromx, fromy, &r, &g, &b, &a);
+        if(a == 0)
+            continue;
 #if 1
         R += r; G += g; B += b;
 #else
         R += r; G += g; B += b;
-        get_rgb_default(bitmap, pixels, fromx - 1, fromy, &r, &g, &b);
+        get_rgba_default(bitmap, pixels, fromx - 1, fromy, &r, &g, &b, &a);
         R += r; G += g; B += b;
-        get_rgb_default(bitmap, pixels, fromx, fromy - 1, &r, &g, &b);
+        get_rgba_default(bitmap, pixels, fromx, fromy - 1, &r, &g, &b, &a);
         R += r; G += g; B += b;
-        get_rgb_default(bitmap, pixels, fromx + 1, fromy, &r, &g, &b);
+        get_rgba_default(bitmap, pixels, fromx + 1, fromy, &r, &g, &b, &a);
         R += r; G += g; B += b;
-        get_rgb_default(bitmap, pixels, fromx, fromy + 1, &r, &g, &b);
+        get_rgba_default(bitmap, pixels, fromx, fromy + 1, &r, &g, &b, &a);
         R += r; G += g; B += b;
         R /= 5; G /= 5; B /= 5;
 #endif
@@ -443,6 +456,7 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
         /* distance to black */
         distbg = XRATIO * val * val;
         distbg += FUZZINESS * _get_dither() - 0x80 * FUZZINESS;
+        distbg = distbg * 2 / 4;
         outbg = CACA_COLOR_BLACK;
 
         /* distance to 30% */
@@ -509,7 +523,7 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
              + YRATIO * (sat - 0x1000) * (sat - 0x1000)
              + HRATIO * (hue - hue2) * (hue - hue2);
         dist += FUZZINESS * _get_dither() - 0x80 * FUZZINESS;
-        dist = dist * 3 / 4;
+//        dist = dist * 3 / 4;
         if(dist <= distbg)
         {
             outfg = outbg;
@@ -528,7 +542,8 @@ void caca_draw_bitmap(int x1, int y1, int x2, int y2,
              + YRATIO * (sat - 0x1000) * (sat - 0x1000)
              + HRATIO * (hue - hue2) * (hue - hue2);
         dist += FUZZINESS * _get_dither() - 0x80 * FUZZINESS;
-        dist = dist / 2;
+        //dist = dist * 3 / 4;
+        //dist = dist / 2;
         if(dist <= distbg)
         {
             outfg = outbg;
diff --git a/src/box.c b/src/box.c
index 4b9a47d..9d54eb2 100644
--- a/src/box.c
+++ b/src/box.c
@@ -58,8 +58,8 @@ void caca_draw_thin_box(int x1, int y1, int x2, int y2)
         y1 = y2; y2 = tmp;
     }
 
-    xmax = caca_get_width() - 1;
-    ymax = caca_get_height() - 1;
+    xmax = _caca_width - 1;
+    ymax = _caca_height - 1;
 
     if(x2 < 0 || y2 < 0 || x1 > xmax || y1 > ymax)
         return;
@@ -111,8 +111,8 @@ void caca_fill_box(int x1, int y1, int x2, int y2, char c)
         y1 = y2; y2 = tmp;
     }
 
-    xmax = caca_get_width() - 1;
-    ymax = caca_get_height() - 1;
+    xmax = _caca_width - 1;
+    ymax = _caca_height - 1;
 
     if(x2 < 0 || y2 < 0 || x1 > xmax || y1 > ymax)
         return;
diff --git a/src/caca.c b/src/caca.c
index 9d8d368..2a5d078 100644
--- a/src/caca.c
+++ b/src/caca.c
@@ -38,9 +38,6 @@
 #elif defined(USE_CONIO)
 #   include <dos.h>
 #   include <conio.h>
-#   if defined(SCREENUPDATE_IN_PC_H)
-#       include <pc.h>
-#   endif
 #else
 #   error "no graphics library detected"
 #endif
@@ -62,7 +59,6 @@ int _caca_attr[16*16];
 #endif
 
 #if defined(USE_CONIO)
-static struct text_info ti;
 char *_caca_screen;
 #endif
 
@@ -132,24 +128,12 @@ int caca_init(void)
 
 unsigned int caca_get_width(void)
 {
-#if defined(USE_SLANG)
-    return SLtt_Screen_Cols;
-#elif defined(USE_NCURSES)
-    return COLS;
-#elif defined(USE_CONIO)
-    return ti.screenwidth;
-#endif
+    return _caca_width;
 }
 
 unsigned int caca_get_height(void)
 {
-#if defined(USE_SLANG)
-    return SLtt_Screen_Rows;
-#elif defined(USE_NCURSES)
-    return LINES;
-#else
-    return ti.screenheight;
-#endif
+    return _caca_height;
 }
 
 const char *caca_get_color_name(enum caca_color color)
@@ -212,7 +196,7 @@ void caca_end(void)
     _wscroll = 1;
     textcolor((enum COLORS)WHITE);
     textbackground((enum COLORS)BLACK);
-    gotoxy(caca_get_width(), caca_get_height());
+    gotoxy(_caca_width, _caca_height);
     cputs("\r\n");
     _setcursortype(_NORMALCURSOR);
 #endif
diff --git a/src/caca.h b/src/caca.h
index df24154..0b22928 100644
--- a/src/caca.h
+++ b/src/caca.h
@@ -200,21 +200,22 @@ unsigned int caca_sqrt(unsigned int);
  */
 struct caca_sprite;
 struct caca_sprite * caca_load_sprite(const char *);
-int caca_get_sprite_frames(struct caca_sprite *);
-int caca_get_sprite_width(struct caca_sprite *, int);
-int caca_get_sprite_height(struct caca_sprite *, int);
-int caca_get_sprite_dx(struct caca_sprite *, int);
-int caca_get_sprite_dy(struct caca_sprite *, int);
-void caca_draw_sprite(int, int, struct caca_sprite *, int);
+int caca_get_sprite_frames(const struct caca_sprite *);
+int caca_get_sprite_width(const struct caca_sprite *, int);
+int caca_get_sprite_height(const struct caca_sprite *, int);
+int caca_get_sprite_dx(const struct caca_sprite *, int);
+int caca_get_sprite_dy(const struct caca_sprite *, int);
+void caca_draw_sprite(int, int, const struct caca_sprite *, int);
 void caca_free_sprite(struct caca_sprite *);
 
 /*
  * Bitmap handling
  */
 struct caca_bitmap;
-struct caca_bitmap *caca_create_bitmap(int, int, int, int, int, int, int);
-void caca_set_bitmap_palette(struct caca_bitmap *, int[], int[], int[]);
-void caca_draw_bitmap(int, int, int, int, struct caca_bitmap *, char *);
+struct caca_bitmap *caca_create_bitmap(int, int, int, int, int, int, int, int);
+void caca_set_bitmap_palette(struct caca_bitmap *, unsigned int[],
+                             unsigned int[], unsigned int[], unsigned int[]);
+void caca_draw_bitmap(int, int, int, int, const struct caca_bitmap *, char *);
 void caca_free_bitmap(struct caca_bitmap *);
 
 #ifdef __cplusplus
diff --git a/src/caca_internals.h b/src/caca_internals.h
index 6d2ec0a..ab0b8be 100644
--- a/src/caca_internals.h
+++ b/src/caca_internals.h
@@ -37,9 +37,13 @@ extern int _caca_attr[];
 #endif
 
 #if defined(USE_CONIO)
+extern struct text_info _ti;
 extern char *_caca_screen;
 #endif
 
+extern unsigned int _caca_width;
+extern unsigned int _caca_height;
+
 extern char *_caca_empty_line;
 extern char *_caca_scratch_line;
 
diff --git a/src/conic.c b/src/conic.c
index c28b62d..65dc3c9 100644
--- a/src/conic.c
+++ b/src/conic.c
@@ -191,13 +191,13 @@ static void ellipsepoints(int xo, int yo, int x, int y, char c)
 {
     uint8_t b = 0;
 
-    if(xo + x >= 0 && xo + x < (int)caca_get_width())
+    if(xo + x >= 0 && xo + x < (int)_caca_width)
         b |= 0x1;
-    if(xo - x >= 0 && xo - x < (int)caca_get_width())
+    if(xo - x >= 0 && xo - x < (int)_caca_width)
         b |= 0x2;
-    if(yo + y >= 0 && yo + y < (int)caca_get_height())
+    if(yo + y >= 0 && yo + y < (int)_caca_height)
         b |= 0x4;
-    if(yo - y >= 0 && yo - y < (int)caca_get_height())
+    if(yo - y >= 0 && yo - y < (int)_caca_height)
         b |= 0x8;
 
     if((b & (0x1|0x4)) == (0x1|0x4))
diff --git a/src/graphics.c b/src/graphics.c
index c45905d..6de3d3d 100644
--- a/src/graphics.c
+++ b/src/graphics.c
@@ -35,6 +35,9 @@
 #   include <curses.h>
 #elif defined(USE_CONIO)
 #   include <conio.h>
+#   if defined(SCREENUPDATE_IN_PC_H)
+#       include <pc.h>
+#   endif
 #else
 #   error "no graphics library detected"
 #endif
@@ -54,6 +57,13 @@
 #include "caca.h"
 #include "caca_internals.h"
 
+#ifdef USE_CONIO
+static struct text_info ti;
+#endif
+
+unsigned int _caca_width;
+unsigned int _caca_height;
+
 static unsigned int _caca_delay;
 static unsigned int _caca_rendertime;
 
@@ -92,8 +102,8 @@ void caca_putchar(int x, int y, char c)
 #if defined(USE_CONIO)
     char *data;
 #endif
-    if(x < 0 || x >= (int)caca_get_width() ||
-       y < 0 || y >= (int)caca_get_height())
+    if(x < 0 || x >= (int)_caca_width ||
+       y < 0 || y >= (int)_caca_height)
         return;
 
 #if defined(USE_SLANG)
@@ -103,7 +113,7 @@ void caca_putchar(int x, int y, char c)
     move(y, x);
     addch(c);
 #elif defined(USE_CONIO)
-    data = _caca_screen + 2 * (x + y * caca_get_width());
+    data = _caca_screen + 2 * (x + y * _caca_width);
     data[0] = c;
     data[1] = (_caca_bgcolor << 4) | _caca_fgcolor;
 //    gotoxy(x + 1, y + 1);
@@ -115,7 +125,7 @@ void caca_putstr(int x, int y, const char *s)
 {
     unsigned int len;
 
-    if(y < 0 || y >= (int)caca_get_height() || x >= (int)caca_get_width())
+    if(y < 0 || y >= (int)_caca_height || x >= (int)_caca_width)
         return;
 
     len = strlen(s);
@@ -129,10 +139,10 @@ void caca_putstr(int x, int y, const char *s)
         x = 0;
     }
 
-    if(x + len >= caca_get_width())
+    if(x + len >= _caca_width)
     {
-        memcpy(_caca_scratch_line, s, caca_get_width() - x);
-        _caca_scratch_line[caca_get_width() - x] = '\0';
+        memcpy(_caca_scratch_line, s, _caca_width - x);
+        _caca_scratch_line[_caca_width - x] = '\0';
         s = _caca_scratch_line;
     }
 
@@ -143,7 +153,7 @@ void caca_putstr(int x, int y, const char *s)
     move(y, x);
     addstr(s);
 #elif defined(USE_CONIO)
-    char *buf = _caca_screen + 2 * (x + y * caca_get_width());
+    char *buf = _caca_screen + 2 * (x + y * _caca_width);
     while(*s)
     {
         *buf++ = *s++;
@@ -160,19 +170,19 @@ void caca_printf(int x, int y, const char *format, ...)
     char *buf = tmp;
     va_list args;
 
-    if(y < 0 || y >= (int)caca_get_height() || x >= (int)caca_get_width())
+    if(y < 0 || y >= (int)_caca_height || x >= (int)_caca_width)
         return;
 
-    if(caca_get_width() - x + 1 > BUFSIZ)
-        buf = malloc(caca_get_width() - x + 1);
+    if(_caca_width - x + 1 > BUFSIZ)
+        buf = malloc(_caca_width - x + 1);
 
     va_start(args, format);
 #if defined(HAVE_VSNPRINTF)
-    vsnprintf(buf, caca_get_width() - x + 1, format, args);
+    vsnprintf(buf, _caca_width - x + 1, format, args);
 #else
     vsprintf(buf, format, args);
 #endif
-    buf[caca_get_width() - x] = '\0';
+    buf[_caca_width - x] = '\0';
     va_end(args);
 
     caca_putstr(x, y, buf);
@@ -185,7 +195,7 @@ void caca_clear(void)
 {
     enum caca_color oldfg = caca_get_fg_color();
     enum caca_color oldbg = caca_get_bg_color();
-    int y = caca_get_height();
+    int y = _caca_height;
 
     caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);
 
@@ -234,6 +244,9 @@ int _caca_init_graphics(void)
     /* Disable alt charset support so that we get all 256 colour pairs */
     SLtt_Has_Alt_Charset = 0;
 
+    _caca_width = SLtt_Screen_Cols;
+    _caca_height = SLtt_Screen_Rows;
+
 #elif defined(USE_NCURSES)
     static int curses_colors[] =
     {
@@ -292,6 +305,9 @@ int _caca_init_graphics(void)
             }
         }
 
+    _caca_width = COLS;
+    _caca_height = LINES;
+
 #elif defined(USE_CONIO)
     gettextinfo(&ti);
     _caca_screen = malloc(2 * ti.screenwidth * ti.screenheight);
@@ -302,13 +318,15 @@ int _caca_init_graphics(void)
 #   else
     /* FIXME */
 #   endif
+    _caca_width = ti.screenwidth;
+    _caca_height = ti.screenheight;
 
 #endif
-    _caca_empty_line = malloc(caca_get_width() + 1);
-    memset(_caca_empty_line, ' ', caca_get_width());
-    _caca_empty_line[caca_get_width()] = '\0';
+    _caca_empty_line = malloc(_caca_width + 1);
+    memset(_caca_empty_line, ' ', _caca_width);
+    _caca_empty_line[_caca_width] = '\0';
 
-    _caca_scratch_line = malloc(caca_get_width() + 1);
+    _caca_scratch_line = malloc(_caca_width + 1);
 
     _caca_delay = 0;
     _caca_rendertime = 0;
diff --git a/src/line.c b/src/line.c
index 3ba4f83..b101704 100644
--- a/src/line.c
+++ b/src/line.c
@@ -171,7 +171,7 @@ static void clip_line(struct line* s)
     }
     else if(bits1 & (1<<1))
     {
-        int xmax = caca_get_width() - 1;
+        int xmax = _caca_width - 1;
         s->y1 = s->y2 - (s->x2 - xmax) * (s->y2 - s->y1) / (s->x2 - s->x1);
         s->x1 = xmax;
     }
@@ -182,7 +182,7 @@ static void clip_line(struct line* s)
     }
     else if(bits1 & (1<<3))
     {
-        int ymax = caca_get_height() - 1;
+        int ymax = _caca_height - 1;
         s->x1 = s->x2 - (s->y2 - ymax) * (s->x2 - s->x1) / (s->y2 - s->y1);
         s->y1 = ymax;
     }
@@ -203,12 +203,12 @@ static uint8_t clip_bits(int x, int y)
 
     if(x < 0)
         b |= (1<<0);
-    else if(x >= (int)caca_get_width())
+    else if(x >= (int)_caca_width)
         b |= (1<<1);
 
     if(y < 0)
         b |= (1<<2);
-    else if(y >= (int)caca_get_height())
+    else if(y >= (int)_caca_height)
         b |= (1<<3);
 
     return b;
diff --git a/src/sprite.c b/src/sprite.c
index 48d224e..9d63ee6 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -165,7 +165,7 @@ sprite_alloc_failed:
     return NULL;
 }
 
-int caca_get_sprite_frames(struct caca_sprite *sprite)
+int caca_get_sprite_frames(const struct caca_sprite *sprite)
 {
     if(sprite == NULL)
         return 0;
@@ -173,7 +173,7 @@ int caca_get_sprite_frames(struct caca_sprite *sprite)
     return sprite->nf;
 }
 
-int caca_get_sprite_width(struct caca_sprite *sprite, int f)
+int caca_get_sprite_width(const struct caca_sprite *sprite, int f)
 {
     if(sprite == NULL)
         return 0;
@@ -184,7 +184,7 @@ int caca_get_sprite_width(struct caca_sprite *sprite, int f)
     return sprite->frames[f].w;
 }
 
-int caca_get_sprite_height(struct caca_sprite *sprite, int f)
+int caca_get_sprite_height(const struct caca_sprite *sprite, int f)
 {
     if(sprite == NULL)
         return 0;
@@ -195,7 +195,7 @@ int caca_get_sprite_height(struct caca_sprite *sprite, int f)
     return sprite->frames[f].h;
 }
 
-int caca_get_sprite_dx(struct caca_sprite *sprite, int f)
+int caca_get_sprite_dx(const struct caca_sprite *sprite, int f)
 {
     if(sprite == NULL)
         return 0;
@@ -206,7 +206,7 @@ int caca_get_sprite_dx(struct caca_sprite *sprite, int f)
     return sprite->frames[f].dx;
 }
 
-int caca_get_sprite_dy(struct caca_sprite *sprite, int f)
+int caca_get_sprite_dy(const struct caca_sprite *sprite, int f)
 {
     if(sprite == NULL)
         return 0;
@@ -217,7 +217,7 @@ int caca_get_sprite_dy(struct caca_sprite *sprite, int f)
     return sprite->frames[f].dy;
 }
 
-void caca_draw_sprite(int x, int y, struct caca_sprite *sprite, int f)
+void caca_draw_sprite(int x, int y, const struct caca_sprite *sprite, int f)
 {
     int i, j;
     enum caca_color oldfg, oldbg;
diff --git a/src/triangle.c b/src/triangle.c
index 8c57aec..47a6a0b 100644
--- a/src/triangle.c
+++ b/src/triangle.c
@@ -70,8 +70,8 @@ void caca_fill_triangle(int x1, int y1, int x2, int y2, int x3, int y3, char c)
     x2 *= 4;
     x3 *= 4;
 
-    xmax = caca_get_width() - 1;
-    ymax = caca_get_height() - 1;
+    xmax = _caca_width - 1;
+    ymax = _caca_height - 1;
 
     /* Rasterize our triangle */
     for(y = y1 < 0 ? 0 : y1; y <= y3 && y <= ymax; y++)