Changes in uspace/lib/c/include/io/pixelmap.h [6d5e378:00ddb40] in mainline

File:

• uspace/lib/c/include/io/pixelmap.h (modified) (4 diffs)

uspace/lib/c/include/io/pixelmap.h

@@ -1 +1 @@
 /*
  * Copyright (c) 2011 Petr Koupy
+ * Copyright (c) 2014 Martin Sucha
  * All rights reserved.
  *
@@ -41 +42 @@
 #include <io/pixel.h>
 
+/* Defines how a pixel outside of pixmap rectangle shall be treated */
+typedef enum {
+        /* Pixels outside of a pixmap are PIXEL(0, 0, 0, 0) */
+        PIXELMAP_EXTEND_TRANSPARENT_BLACK = 0,
+        
+        /* The pixmap is repeated infinetely */
+        PIXELMAP_EXTEND_TILE,
+        
+        /* If outside of a pixmap, return closest pixel from the edge */
+        PIXELMAP_EXTEND_SIDES,
+        
+        /* If outside of a pixmap, return closest pixel from the edge,
+         * with alpha = 0
+         */
+        PIXELMAP_EXTEND_TRANSPARENT_SIDES
+} pixelmap_extend_t;
+
 typedef struct {
         sysarg_t width;
@@ -52 +70 @@
     sysarg_t y)
 {
-        size_t offset = y * pixelmap->width + x;
-        pixel_t *pixel = pixelmap->data + offset;
-        return pixel;
+        if (x < pixelmap->width && y < pixelmap->height) {
+                size_t offset = y * pixelmap->width + x;
+                pixel_t *pixel = pixelmap->data + offset;
+                return pixel;
+        } else {
+                return NULL;
+        }
 }
 
@@ -82 +104 @@
 }
 
+static inline pixel_t pixelmap_get_extended_pixel(pixelmap_t *pixmap,
+    native_t x, native_t y, pixelmap_extend_t extend)
+{
+        bool transparent = false;
+        if (extend == PIXELMAP_EXTEND_TILE) {
+                x %= pixmap->width;
+                y %= pixmap->height;
+        }
+        else if (extend == PIXELMAP_EXTEND_SIDES ||
+            extend == PIXELMAP_EXTEND_TRANSPARENT_SIDES) {
+                bool transparent_outside =
+                    (extend == PIXELMAP_EXTEND_TRANSPARENT_SIDES);
+                if (x < 0) {
+                        x = 0;
+                        transparent = transparent_outside;
+                }
+                else if (((sysarg_t) x) >= pixmap->width) {
+                        x = pixmap->width - 1;
+                        transparent = transparent_outside;
+                }
+                
+                if (y < 0) {
+                        y = 0;
+                        transparent = transparent_outside;
+                }
+                else if (((sysarg_t) y) >= pixmap->height) {
+                        y = pixmap->height - 1;
+                        transparent = transparent_outside;
+                }
+        }
+        
+        if (x < 0 || ((sysarg_t) x) >= pixmap->width ||
+            y < 0 || ((sysarg_t) y) >= pixmap->height)
+                return PIXEL(0, 0, 0, 0);
+
+        pixel_t pixel = pixelmap_get_pixel(pixmap, x, y);
+        
+        if (transparent)
+                pixel = PIXEL(0, RED(pixel), GREEN(pixel), BLUE(pixel));
+        
+        return pixel;
+}
+
+
 #endif