Hoist out line_clip and screen_draw_*

CMakeLists.txt

@@ -91,6 +91,7 @@ set(PUBLIC_HEADERS
     include/framebuf/span.h
     include/geom/box.h
     include/geom/layout.h
+    include/geom/line.h
     include/geom/packer.h
     include/geom/point.h
     include/io/path.h
@@ -225,6 +226,7 @@ set(FRAMEBUF_SOURCES
     libraries/framebuf/palettes/palettes.c
     libraries/framebuf/pixelfmt/log2bpp.c
     libraries/framebuf/screen/screen.c
+    libraries/framebuf/screen/screen-draw.c
     libraries/framebuf/span-registry/get.c
     libraries/framebuf/span-registry/regdata.h
     libraries/framebuf/span/all8888.c
@@ -249,6 +251,7 @@ set(GEOM_SOURCES
     libraries/geom/box/translated.c
     libraries/geom/box/union.c
     libraries/geom/layout/layout.c
+    libraries/geom/line/line.c
     libraries/geom/packer/impl.h
     libraries/geom/packer/packer.c)
 

include/framebuf/pixelfmt.h

@@ -92,8 +92,9 @@ typedef unsigned int   pixelfmt_argb8888_t;
 typedef unsigned int   pixelfmt_xxxa8888_t; /* any 32bpp alpha */
 
 typedef unsigned int   pixelfmt_any_t; /* generic/unspecified pixel */
-typedef unsigned short pixelfmt_any16_t; /* any 16bpp */
-typedef unsigned int   pixelfmt_any32_t; /* any 32bpp */
+typedef unsigned char  pixelfmt_any8_t; /* any 8bpp pixel */
+typedef unsigned short pixelfmt_any16_t; /* any 16bpp pixel */
+typedef unsigned int   pixelfmt_any32_t; /* any 32bpp pixel */
 
 /* ----------------------------------------------------------------------- */
 

include/geom/line.h

@@ -0,0 +1,31 @@
+/* line.h -- lines */
+
+#ifndef GEOM_LINE_H
+#define GEOM_LINE_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "geom/box.h"
+
+/// Clips the line (x0,y0)-(x1,y1) by `clip` and returns the clipped points in `x0` and co.
+///
+/// - Parameters:
+///   - clip: Rectangular clip region.
+///   - x0: X coordinate of first point of line (in/out).
+///   - y0: Y coordinate of first point of line (in/out).
+///   - x1: X coordinate of second point of line (in/out).
+///   - y1: Y coordinate of second point of line (in/out).
+int line_clip(const box_t *clip,
+              int         *x0,
+              int         *y0,
+              int         *x1,
+              int         *y1);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GEOM_LINE_H */