diff --git a/ext/native/gfx_es2/draw_text_android.cpp b/ext/native/gfx_es2/draw_text_android.cpp
index fecad36bb9..b5afccbf96 100644
--- a/ext/native/gfx_es2/draw_text_android.cpp
+++ b/ext/native/gfx_es2/draw_text_android.cpp
@@ -191,7 +191,6 @@ void TextDrawerAndroid::DrawStringBitmap(std::vector<uint8_t> &bitmapData, TextS
 	assert(env_->GetArrayLength(imageData) == imageWidth * imageHeight);
 	if (texFormat == Draw::DataFormat::B4G4R4A4_UNORM_PACK16 || texFormat == Draw::DataFormat::R4G4B4A4_UNORM_PACK16) {
 		bitmapData.resize(entry.bmWidth * entry.bmHeight * sizeof(uint16_t));
-
 		uint16_t *bitmapData16 = (uint16_t *)&bitmapData[0];
 		for (int x = 0; x < entry.bmWidth; x++) {
 			for (int y = 0; y < entry.bmHeight; y++) {
@@ -200,7 +199,17 @@ void TextDrawerAndroid::DrawStringBitmap(std::vector<uint8_t> &bitmapData, TextS
 				bitmapData16[entry.bmWidth * y + x] = (uint16_t)v;
 			}
 		}
+	} else if (texFormat == Draw::DataFormat::R8_UNORM) {
+		bitmapData.resize(entry.bmWidth * entry.bmHeight);
+		for (int x = 0; x < entry.bmWidth; x++) {
+			for (int y = 0; y < entry.bmHeight; y++) {
+				uint32_t v = jimage[imageWidth * y + x];
+				v = (v >> 12) & 0xF;  // Just grab some bits from the green channel.
+				bitmapData[entry.bmWidth * y + x] = (uint8_t)(v | (v << 4));
+			}
+		}
 	} else {
+		ELOG("Bad TextDrawer format");
 		assert(false);
 	}
 	env_->ReleaseIntArrayElements(imageData, jimage, 0);
diff --git a/ext/native/gfx_es2/draw_text_qt.cpp b/ext/native/gfx_es2/draw_text_qt.cpp
index a6bcbcebee..406507518f 100644
--- a/ext/native/gfx_es2/draw_text_qt.cpp
+++ b/ext/native/gfx_es2/draw_text_qt.cpp
@@ -125,7 +125,15 @@ void TextDrawerQt::DrawStringBitmap(std::vector<uint8_t> &bitmapData, TextString
 				bitmapData16[entry.bmWidth * y + x] = 0xfff0 | (image.pixel(x, y) >> 28);
 			}
 		}
+	} else if (texFormat == Draw::DataFormat::R8_UNORM) {
+		bitmapData.resize(entry.bmWidth * entry.bmHeight);
+		for (int x = 0; x < entry.bmWidth; x++) {
+			for (int y = 0; y < entry.bmHeight; y++) {
+				bitmapData[entry.bmWidth * y + x] = image.pixel(x, y) >> 24;
+			}
+		}
 	} else {
+		ELOG("Bad TextDrawer format");
 		assert(false);
 	}
 }
diff --git a/ext/native/gfx_es2/draw_text_win.cpp b/ext/native/gfx_es2/draw_text_win.cpp
index ddfb144432..9da3cda741 100644
--- a/ext/native/gfx_es2/draw_text_win.cpp
+++ b/ext/native/gfx_es2/draw_text_win.cpp
@@ -1,3 +1,4 @@
+#include <cassert>
 #include "base/display.h"
 #include "base/logging.h"
 #include "base/stringutil.h"
@@ -271,6 +272,17 @@ void TextDrawerWin32::DrawStringBitmap(std::vector<uint8_t> &bitmapData, TextStr
 				bitmapData16[entry.bmWidth * y + x] = (bAlpha << 12) | 0x0fff;
 			}
 		}
+	} else if (texFormat == Draw::DataFormat::R8_UNORM) {
+		bitmapData.resize(entry.bmWidth * entry.bmHeight);
+		for (int y = 0; y < entry.bmHeight; y++) {
+			for (int x = 0; x < entry.bmWidth; x++) {
+				uint8_t bAlpha = ctx_->pBitmapBits[MAX_TEXT_WIDTH * y + x] & 0xff;
+				bitmapData[entry.bmWidth * y + x] = bAlpha;
+			}
+		}
+	} else {
+		ELOG("Bad TextDrawer format");
+		assert(false);
 	}
 }