1 files changed, 84 insertions, 0 deletions
diff --git a/nebu/video/pixels.c b/nebu/video/pixels.c
new file mode 100644
index 0000000..b82c170
--- /dev/null
+++ b/nebu/video/pixels.c
@@ -0,0 +1,84 @@
+#include <stdlib.h>
+
+unsigned char *scalePixelBitmap(unsigned char *source, int sw, int sh, 
+			   int posx, int posy, int width, int height,
+			   int dw, int dh, int bytes) {
+  int x, y;
+  unsigned char *data;
+  unsigned char byte;
+  int i;
+
+  int row;
+
+  row = dw / 8;
+  if(dw % 8) row++;
+  
+  data = (unsigned char*) malloc( row * dh );
+  for(y = 0; y < dh; y++) {
+    byte = 0;
+    for(x = 0; x < dw; x++) {
+      int sx, sy;
+      sx = posx + ((x * width) / dw);
+      sy = posy + ((y * height) / dh);
+      for(i = 0; (i < bytes) && (i < 3); i++) {
+	if(source[bytes * (sx + sy * sw) + i] != 0) {
+	  /* printf("source value: (%d %d, %d): %d\n", 
+	     sx, sy, i, source[bytes * (sx + sy * sw) + i]); */
+	  byte |= (1 << (x % 8) );
+	  break;
+	} else {
+	  /* printf("source value: (%d %d, %d): %d\n", 
+	     sx, sy, i, source[bytes * (sx + sy * sw) + i]); */
+	}
+      }
+      if((x % 8) == 7) {
+	data[x / 8 + y * row] = byte;
+      }
+    }
+    if(x % 8)
+      data[x / 8 + y * row] = byte;
+    byte = 0;
+  }
+  return data;
+}
+
+unsigned char *scalePixels(const unsigned char *source, int sw, int sh, 
+			   int posx, int posy, int width, int height,
+			   int dw, int dh, int bytes) {
+  int x, y;
+  unsigned char *data;
+  /*
+  fprintf(stderr, "scaling from (%d,%d-%d,%d) in a (%d, %d)"
+	  "to (%d,%d), bytes: %d\n", posx, posy, posx + width, posy + width,
+	  sw, sh, dw, dh, bytes);
+  */
+  data = (unsigned char*) malloc( dw * dh * bytes );
+  for(y = 0; y < dh; y++) {
+    for(x = 0; x < dw; x++) {
+      int sx, sy, j;
+      int sx2, sy2;
+      
+      sx = posx + ((x * width) / dw);
+      sy = posy + ((y * height) / dh);
+      (sx == sw - 1) ? (sx2 = sx - 1) : (sx2 = sx + 1);
+      (sy == sh - 1) ? (sy2 = sy - 1) : (sy2 = sy + 1);
+      /* printf("%d, %d to %d, %d\n", x, y, sx, sy); */
+      for(j = 0; j < bytes; j++) {
+	data[bytes * (x + y * dw) + j] = 
+	  (source[bytes * (sx + sy * sw) + j] +
+	   source[bytes * (sx2 + sy * sw) + j] +
+	   source[bytes * (sx + sy2 * sw) + j] +
+	   source[bytes * (sx2 + sy2 * sw) + j]) / 4;
+      }
+    }
+  }
+  return data;
+}
+  
+
+
+
+
+
+
+