Changes in uspace/lib/c/include/io/pixelmap.h [6d527cff:4805495] in mainline

File:

• uspace/lib/c/include/io/pixelmap.h (modified) (2 diffs)

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

@@ -42 +42 @@
 #include <stddef.h>
 #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 {
@@ -88 +106 @@
 }
 
+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