Fix off by one error in hline and vline (tuupola#110)

CHANGELOG.md

@@ -7,10 +7,11 @@ All notable changes to this project will be documented in this file, in reverse
 ### Changed
 - Rename `bitmap.c` to `hagl_bitmap.c` ([#100](https://github.com/tuupola/hagl/pull/100)).
 - Rename `color_t` to `hagl_color_t` ([#104](https://github.com/tuupola/hagl/pull/104)).
+- Initialize character buffer only when used and move it to heap ([#101](https://github.com/tuupola/hagl/pull/101), [#44](https://github.com/tuupola/hagl/issues/44)).
 
 ### Fixed
-- Initialize character buffer only when used and move it to heap ([#101](https://github.com/tuupola/hagl/pull/101), [#44](https://github.com/tuupola/hagl/issues/44)) .
 - Overflow bug when resizing big bitmaps ([#102](https://github.com/tuupola/hagl/pull/102), [#49](https://github.com/tuupola/hagl/issues/49)) .
+- Both horizontal and vertical lines were one pixel too short ([#110](https://github.com/tuupola/hagl/pull/110)) .
 
 ### Added
 - New `hagl_bitmap_init()` function ([#98](https://github.com/tuupola/hagl/pull/98)).

src/hagl_hline.c

@@ -56,17 +56,17 @@ hagl_draw_hline_xyw(void const *_surface, int16_t x0, int16_t y0, uint16_t w, ha
         }
 
         /* Everything outside clip window, nothing to do. */
-        if (width < 0)  {
+        if (width <= 0)  {
             return;
         }
 
         /* Cut anything going over right edge of clip window. */
         if (((x0 + width) > surface->clip.x1)) {
-            width = width - (x0 + width - surface->clip.x1);
+            width = width - (x0 + width - 1 - surface->clip.x1);
         }
 
         surface->hline(&surface, x0, y0, width, color);
     } else {
-        hagl_draw_line(surface, x0, y0, x0 + w, y0, color);
+        hagl_draw_line(surface, x0, y0, x0 + w - 1, y0, color);
     }
 }

src/hagl_vline.c

@@ -56,17 +56,17 @@ hagl_draw_vline_xyh(void const *_surface, int16_t x0, int16_t y0, uint16_t h, ha
         }
 
         /* Everything outside clip window, nothing to do. */
-        if (height < 0)  {
+        if (height <= 0)  {
             return;
         }
 
         /* Cut anything going over right edge. */
         if (((y0 + height) > surface->clip.y1))  {
-            height = height - (y0 + height - surface->clip.y1);
+            height = height - (y0 + height - 1 - surface->clip.y1);
         }
 
         surface->vline(&surface, x0, y0, height, color);
     } else {
-        hagl_draw_line(surface, x0, y0, x0, y0 + h, color);
+        hagl_draw_line(surface, x0, y0, x0, y0 + h - 1, color);
     }
 }