add support for flipping and rotating images

TODO

@@ -4,4 +4,3 @@
 - Remove SGR sequences from width when item text is drawn, currently the width of the item before SGR sequences are used, resulting in some ugly behavior for the selected item
 - Add configuration file using (probably) libconfig
 - Fix highlighting for last character in a match
-- Add rotate and flip keybinds for the image

keybinds.h

@@ -52,7 +52,10 @@ static Key normkeys[] = {
     { SHIFT,                        XK_equal,     setimgsize,      {.i = +100 } },
     { SHIFT,                        XK_minus,     setimgsize,      {.i = -100 } },
     { 0,                            XK_d,         defaultimg,      {0} },
+    { 0,                            XK_r,         rotateimg,       {0} },
     { 0,                            XK_t,         toggleimg,       {0} },
+    { 0,                            XK_h,         flipimagehoriz,  {0} },
+    { 0,                            XK_v,         flipimagevert,   {0} },
 	{ 0,                            XK_k,         move,            {.i = 1  } },
 	{ 0,                            XK_j,         move,            {.i = 2  } },
 	{ 0,                            XK_h,         move,            {.i = 3  } },

libs/img.c

@@ -1,3 +1,41 @@
+void
+flipimage(void)
+{
+    if (!flip) return;
+    if (flip == 1) { /* horizontal */
+        imlib_image_flip_horizontal();
+    } else if (flip == 2) {
+        imlib_image_flip_vertical();
+    } else if (flip == 3) {
+        imlib_image_flip_diagonal();
+    } else {
+        flip = 1;
+    }
+}
+
+void
+rotateimage(void)
+{
+    if (!rotation) return;
+    if (rotation == 1) {
+        imlib_image_orientate(1);
+    } else if (rotation == 2) {
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+    } else if (rotation == 3) {
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+    } else if (rotation == 4) {
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+        imlib_image_orientate(1);
+    } else {
+        rotation = 1;
+    }
+}
+
 void
 cleanupimage(void)
 {
@@ -49,6 +87,8 @@ drawimage(void)
     } if (image && longestedge) {
 
         prepareimage();
+        rotateimage();
+        flipimage();
 
         int leftmargin = imagegaps;
 

libs/img.h

@@ -7,6 +7,8 @@ static void setimageopts(void);
 static void cleanupimage(void);
 static void drawimage(void);
 static void prepareimage(void);
+static void rotateimage(void);
+static void flipimage(void);
 static void loadimagecache(const char *file, int *width, int *height);
 static void resizetoimageheight(int imageheight);
 

spmenu.c

@@ -127,6 +127,8 @@ static struct item *prev, *curr, *next, *sel;
 static int mon = -1, screen;
 static int managed = 0;
 
+static int flip = 0;
+static int rotation = 0;
 static int imagew = 0;
 static int imageh = 0;
 static int imageg = 0;
@@ -178,6 +180,9 @@ static void savehistory(char *input);
 static void setimgsize(const Arg *arg);
 static void toggleimg(const Arg *arg);
 static void defaultimg(const Arg *arg);
+static void rotateimg(const Arg *arg);
+static void flipimagevert(const Arg *arg);
+static void flipimagehoriz(const Arg *arg);
 
 static void drawmenu(void);
 static void calcoffsets(void);
@@ -244,6 +249,60 @@ setimgsize(const Arg *arg)
     drawmenu();
 }
 
+void
+flipimagevert(const Arg *arg)
+{
+    #if !USEIMAGE
+    return;
+    #endif
+
+    if (!image) return;
+
+    if (flip)
+        flip = 0;
+    else
+        flip = 2;
+
+    cleanupimage();
+    drawimage();
+    drawmenu();
+}
+
+void
+flipimagehoriz(const Arg *arg)
+{
+    #if !USEIMAGE
+    return;
+    #endif
+
+    if (!image) return;
+
+    if (flip)
+        flip = 0;
+    else
+        flip = 1;
+
+    cleanupimage();
+    drawimage();
+    drawmenu();
+}
+
+void
+rotateimg(const Arg *arg)
+{
+    #if !USEIMAGE
+    return;
+    #endif
+
+    if (!image) return;
+
+    rotation++;
+
+    cleanupimage();
+    drawimage();
+    drawmenu();
+}
+
 void
 toggleimg(const Arg *arg)
 {