From 3a141f98c21809baa84dd698b00174d8074f9a73 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sun, 6 Jun 2021 11:33:08 +0200
Subject: Add draw_filled_rect function

---
 src/renderer.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'src/renderer.c')

diff --git a/src/renderer.c b/src/renderer.c
index 2b1f0d2..773d50b 100644
--- a/src/renderer.c
+++ b/src/renderer.c
@@ -26,7 +26,7 @@ static u32 dirty_tiles[21] = {0};
 
 IWRAM_CODE
 void
-draw_pixel(size_t x, size_t y, u8 color) {
+draw_pixel(size_t x, size_t y, u8 clr) {
     BOUNDCHECK_SCREEN(x, y);
 
     // Find row position for the given x/y coordinates.
@@ -38,7 +38,7 @@ draw_pixel(size_t x, size_t y, u8 color) {
 
     // Update backbuffer.
     size_t shift = start_col * sizeof(u32);
-    BACKBUF[pos] = (BACKBUF[pos] & ~(0xF << shift)) | color << shift;
+    BACKBUF[pos] = (BACKBUF[pos] & ~(0xF << shift)) | clr << shift;
 
     // Mark tile as dirty.
     dirty_tiles[tile_y] |= 1 << tile_x;
@@ -129,7 +129,7 @@ draw_line(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
         if (dx >= dy) {
             // Positive slope.
             int diff = 2 * dy - dx;
-            for (int i = 0; i <= dx; ++i) {
+            for (size_t i = 0; i <= dx; ++i) {
                 draw_pixel(x, y, clr);
                 if (diff >= 0) {
                     y += y_step;
@@ -141,7 +141,7 @@ draw_line(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
         } else {
             // Negative slope.
             int diff = 2 * dx - dy;
-            for (int i = 0; i <= dy; ++i) {
+            for (size_t i = 0; i <= dy; ++i) {
                 draw_pixel(x, y, clr);
                 if (diff >= 0) {
                     x += x_step;
@@ -251,6 +251,21 @@ draw_rect(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
     }
 }
 
+IWRAM_CODE
+void
+draw_filled_rect(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
+    BOUNDCHECK_SCREEN(x0, y0);
+    BOUNDCHECK_SCREEN(x1, y1);
+
+    size_t dx = x1 - x0;
+    size_t dy = y1 - y0;
+    size_t n_rect = MIN(dx, dy);
+    n_rect = n_rect / 2 + 1;
+    for (size_t i = 0; i < n_rect; i++) {
+        draw_rect(x0 + i, y0 + i, x1 - i, y1 - i, clr);
+    }
+}
+
 IWRAM_CODE
 void
 draw_tile(size_t x, size_t y, Tile *tile, bool merge) {
-- 
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