Here we go

1 files changed, 65 insertions, 0 deletions

diff --git a/Gfx.c b/Gfx.c
new file mode 100755
index 0000000..1145f9a
--- /dev/null
+++ b/Gfx.c
@@ -0,0 +1,65 @@
+#include "Gfx.h"
+#include "Kullers.h"
+
+static void *bitmap = (void*)0;
+unsigned long g_width, g_height;
+unsigned long minx, miny, maxx, maxy;
+
+void Gfx_init( void *offscreen, int width, int height ) {
+    maxx = g_width  = width;
+    maxy = g_height = height;
+    bitmap   = offscreen;
+    minx = miny = 0;
+}
+
+void Gfx_destroy( void ) {
+//    if( bitmap )
+//        free( bitmap );
+}
+
+void Gfx_clear( void ) {
+    unsigned long *dest  = ((unsigned long *)bitmap) + miny * g_width + minx;
+    int            nochy = maxy - miny;
+
+    while( nochy-- ) {
+        memset( dest, 0, (maxx - minx) << 2);
+        dest += g_width;
+    }
+
+    minx = g_width; miny = g_height;
+    maxx = 0;       maxy = 0;
+}
+
+int getkulleroff( int radius ) {
+    int sum = 0;
+    while( --radius>0 )
+        sum += radius*radius;
+    return sum;
+}
+
+void Gfx_kuller( int x, int y, int radius, unsigned long r, unsigned long g, unsigned long b ) {
+    unsigned long *dest  = ((unsigned long *)bitmap) + y * g_width + x;
+    unsigned char *src   = Kullers + getkulleroff( radius ) - 1;
+    int            xoffs = g_width - radius;
+    int            nochy = radius;
+
+    if( minx > x ) minx = x;
+    if( miny > y ) miny = y;
+    if( maxx < x + radius ) maxx = x + radius;
+    if( maxy < y + radius ) maxy = y + radius;
+
+    while( nochy-- >0 ) {
+        int nochx = radius;
+        while( nochx-- >0 ) {
+            if( *(++src) ) {
+                int this_r = ((r * (int)*src) >> 8);
+                int this_g = ((g * (int)*src) >> 8);
+                int this_b = ((b * (int)*src) >> 8);
+                *(dest++) = (this_r<<16) | (this_g<<8) | this_b;
+             } else {
+                dest++;
+            }
+        }
+        dest += xoffs;
+    }
+}