Changeset 696 for libcacaTweet

Timestamp:

Mar 27, 2006, 9:40:30 AM (15 years ago)

Author:

Sam Hocevar

Message:

• Implemented cucul_invert() to invert a canvas' colours.

Location:

libcaca/trunk/cucul

Files:

• cucul.h (modified) (1 diff)
• transform.c (modified) (1 diff)

libcaca/trunk/cucul/cucul.h

@@ -152 +152 @@
  *
  *  @{ */
+void cucul_invert(cucul_t *);
 void cucul_flip(cucul_t *);
 void cucul_flop(cucul_t *);

libcaca/trunk/cucul/transform.c

@@ -29 +29 @@
 static uint32_t flopchar(uint32_t ch);
 static uint32_t rotatechar(uint32_t ch);
+
+/** \brief Invert a canvas' colours.
+ *
+ *  This function inverts a canvas' colours (black becomes white, red
+ *  becomes cyan, etc.) without changing the characters in it.
+ *
+ *  \param qq The canvas to invert.
+ */
+void cucul_invert(cucul_t *qq)
+{
+    uint8_t *attr = qq->attr;
+    unsigned int i;
+
+    for(i = qq->height * qq->width; i--; )
+    {
+        *attr = ~*attr;
+        attr++;
+    }
+}
 
 /** \brief Flip a canvas horizontally.