From 9db68c5d7688ffc8afb17ddee6db279928ef757d Mon Sep 17 00:00:00 2001
From: Maschell <Maschell@gmx.de>
Date: Thu, 19 Jan 2023 15:08:52 +0100
Subject: [PATCH] Only draw visible pixels

---
 source/utils/DrawUtils.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/source/utils/DrawUtils.cpp b/source/utils/DrawUtils.cpp
index 77e717a..607fb36 100644
--- a/source/utils/DrawUtils.cpp
+++ b/source/utils/DrawUtils.cpp
@@ -121,6 +121,9 @@ void DrawUtils::clear(Color col) {
 }
 
 void DrawUtils::drawPixel(uint32_t x, uint32_t y, uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
+    if (a == 0) {
+        return;
+    }
     float opacity = a / 255.0f;
 
     // put pixel in the drc buffer
@@ -302,6 +305,9 @@ void DrawUtils::setFontColor(Color col) {
 }
 
 static void draw_freetype_bitmap(SFT_Image *bmp, int32_t x, int32_t y) {
+    if (font_col.a == 0) {
+        return;
+    }
     int32_t i, j, p, q;
 
     int32_t x_max = x + bmp->width;
@@ -314,6 +320,9 @@ static void draw_freetype_bitmap(SFT_Image *bmp, int32_t x, int32_t y) {
             if (i < 0 || j < 0 || i >= SCREEN_WIDTH || j >= SCREEN_HEIGHT) {
                 continue;
             }
+            if (src[q * bmp->width + p] == 0) {
+                continue;
+            }
 
             float opacity = src[q * bmp->width + p] / 255.0f;
             DrawUtils::drawPixel(i, j, font_col.r, font_col.g, font_col.b, font_col.a * opacity);