Begin work on areas and viewports.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/area.c b/src/area.c
new file mode 100644
index 0000000..3a03198
--- /dev/null
+++ b/src/area.c
@@ -0,0 +1,50 @@
+#include <SDL.h>
+#include "area.h"
+#include "layer.h"
+#include "viewport.h"
+
+void
+render_area_to_viewport(struct area *area, struct viewport *vp)
+{
+	SDL_Rect srcrect;
+	SDL_Rect dstrect;
+
+	srcrect.x = vp->x;
+	srcrect.y = vp->y;
+	srcrect.w = vp->w;
+	srcrect.h = vp->h;
+	dstrect.x = 0;
+	dstrect.y = 0;
+	dstrect.w = vp->w;
+	dstrect.h = vp->h;
+
+	render_area_to_surface(area, &srcrect, vp->screen, &dstrect);
+}
+
+void
+render_area_to_surface(struct area *area, SDL_Rect *arearect,
+		SDL_Surface *dst, SDL_Rect *dstrect)
+{
+	/* Fast fill with black to avoid artifacts in off-map pixels. */
+	SDL_FillRect(dst, dstrect, 0);
+
+	/* Blit ground layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_GROUND], arearect,
+			dst, dstrect);
+
+	/* Blit low objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_LOW], arearect,
+			dst, dstrect);
+
+	/* TODO: Blit low sprites. */
+
+	/* Blit middle objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_MID], arearect,
+			dst, dstrect);
+
+	/* TODO: Blit high sprites. */
+
+	/* Blit high objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_HIGH], arearect,
+			dst, dstrect);
+}